Merge pull request #277 from 9seconds/go1.19

.github/workflows/ci.yaml

     strategy:
       matrix:
         go_version:
-          - ^1.18
+          - ^1.19
     steps:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Setup Go
         uses: actions/setup-go@v2
         with:
-          go-version: ^1.18
+          go-version: ^1.19
 
       - name: Run linter
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.45.0
+          version: v1.48.0
 
   docker:
     name: Docker

.golangci.toml

 
 [linters]
 enable-all = true
-disable = ["thelper", "ireturn", "varnamelen", "gochecknoglobals", "gas", "goerr113", "exhaustivestruct", "containedctx"]
+disable = [
+    "containedctx",
+    "exhaustivestruct",
+    "exhaustruct",
+    "gas",
+    "gochecknoglobals",
+    "goerr113",
+    "ireturn",
+    "thelper",
+    "varnamelen",
+]

Dockerfile

 ###############################################################################
 # BUILD STAGE
 
-FROM golang:1.18-alpine AS build
+FROM golang:1.19-alpine AS build
 
 RUN set -x \
   && apk --no-cache --update add \

Makefile

 IMAGE_NAME   := mtg
 APP_NAME     := $(IMAGE_NAME)
 
-GOLANGCI_LINT_VERSION := v1.45.0
+GOLANGCI_LINT_VERSION := v1.48.0
 
 VERSION            := $(shell git describe --exact-match HEAD 2>/dev/null || git describe --tags --always)
 COMMON_BUILD_FLAGS := -trimpath -mod=readonly -ldflags="-extldflags '-static' -s -w -X 'main.version=$(VERSION)'"

antireplay/init.go

-// Antireplay package has cache implementations that are effective
-// against replay attacks.
+// Antireplay package has cache implementations that are effective against
+// replay attacks.
 //
-// To understand more about replay attacks, please read documentation
-// for mtglib.AntiReplayCache interface. This package has a list of some
+// To understand more about replay attacks, please read documentation for
+// [mtglib.AntiReplayCache] interface. This package has a list of some
 // implementations of this interface.
 package antireplay
 
 const (
-	// DefaultStableBloomFilterMaxSize is a recommended byte size for a
-	// stable bloom filter.
+	// DefaultStableBloomFilterMaxSize is a recommended byte size for a stable
+	// bloom filter.
 	DefaultStableBloomFilterMaxSize = 1024 * 1024 // 1MiB
 
-	// DefaultStableBloomFilterErrorRate is a recommended default error
-	// rate for a stable bloom filter.
+	// DefaultStableBloomFilterErrorRate is a recommended default error rate for a
+	// stable bloom filter.
 	DefaultStableBloomFilterErrorRate = 0.001
 )

antireplay/noop.go

 
 func (n noop) SeenBefore(_ []byte) bool { return false }
 
-// NewNoop returns an implementation that does nothing. A corresponding
-// method always returns false, so this cache accepts everything you
-// pass to it.
+// NewNoop returns an implementation that does nothing. A corresponding method
+// always returns false, so this cache accepts everything you pass to it.
 func NewNoop() mtglib.AntiReplayCache {
 	return noop{}
 }

antireplay/stable_bloom_filter.go

 	return s.filter.TestAndAdd(digest)
 }
 
-// NewStableBloomFilter returns an implementation of AntiReplayCache
-// based on stable bloom filter.
+// NewStableBloomFilter returns an implementation of AntiReplayCache based on
+// stable bloom filter.
 //
 // http://webdocs.cs.ualberta.ca/~drafiei/papers/DupDet06Sigmod.pdf
 //
-// The basic idea of a stable bloom filter is quite simple: each time
-// when you set a new element, you randomly reset P elements. There is a
-// hardcore math which proves that if you choose this P correctly, you
-// can maintain the same error rate for a stream of elements.
+// The basic idea of a stable bloom filter is quite simple: each time when you
+// set a new element, you randomly reset P elements. There is a hardcore math
+// which proves that if you choose this P correctly, you can maintain the same
+// error rate for a stream of elements.
 //
 // byteSize is the number of bytes you want to give to a bloom filter.
-// errorRate is desired false-positive error rate. If you want to use
-// default values, please pass 0 for byteSize and <0 for errorRate.
+// errorRate is desired false-positive error rate. If you want to use default
+// values, please pass 0 for byteSize and <0 for errorRate.
 func NewStableBloomFilter(byteSize uint, errorRate float64) mtglib.AntiReplayCache {
 	if byteSize == 0 {
 		byteSize = DefaultStableBloomFilterMaxSize
 		errorRate = DefaultStableBloomFilterErrorRate
 	}
 
-	sf := boom.NewDefaultStableBloomFilter(byteSize*8, errorRate) // nolint: gomnd
+	sf := boom.NewDefaultStableBloomFilter(byteSize*8, errorRate) //nolint: gomnd
 	sf.SetHash(xxhash.New64())
 
 	return &stableBloomFilter{

buildinfo.go

+package main
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"runtime/debug"
+	"sort"
+	"strconv"
+	"time"
+)
+
+var version = "dev" // has to be set by ldflags
+
+const (
+	buildInfoModuleStart byte = iota
+	buildInfoModuleFinish
+	buildInfoModuleDelimeter
+)
+
+func getVersion() string {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		return version
+	}
+
+	date := time.Now()
+	commit := ""
+	goVersion := buildInfo.GoVersion
+	dirtySuffix := ""
+
+	for _, setting := range buildInfo.Settings {
+		switch setting.Key {
+		case "vcs.time":
+			date, _ = time.Parse(time.RFC3339, setting.Value)
+		case "vcs.revision":
+			commit = setting.Value
+		case "vcs.modified":
+			if dirty, _ := strconv.ParseBool(setting.Value); dirty {
+				dirtySuffix = " [dirty]"
+			}
+		}
+	}
+
+	hasher := sha256.New()
+
+	checksumModule := func(mod *debug.Module) {
+		hasher.Write([]byte{buildInfoModuleStart})
+
+		io.WriteString(hasher, mod.Path) //nolint: errcheck
+		hasher.Write([]byte{buildInfoModuleDelimeter})
+
+		io.WriteString(hasher, mod.Version) //nolint: errcheck
+		hasher.Write([]byte{buildInfoModuleDelimeter})
+
+		io.WriteString(hasher, mod.Sum) //nolint: errcheck
+
+		hasher.Write([]byte{buildInfoModuleFinish})
+	}
+
+	io.WriteString(hasher, buildInfo.Path) //nolint: errcheck
+
+	binary.Write(hasher, binary.LittleEndian, uint64(1+len(buildInfo.Deps))) //nolint: errcheck
+
+	sort.Slice(buildInfo.Deps, func(i, j int) bool {
+		return buildInfo.Deps[i].Path > buildInfo.Deps[j].Path
+	})
+
+	checksumModule(&buildInfo.Main)
+
+	for _, module := range buildInfo.Deps {
+		checksumModule(module)
+	}
+
+	return fmt.Sprintf("%s (%s: %s on %s%s, modules checksum %s)",
+		version,
+		goVersion,
+		date.Format(time.RFC3339),
+		commit,
+		dirtySuffix,
+		base64.StdEncoding.EncodeToString(hasher.Sum(nil)))
+}

essentials/conns.go

 	"net"
 )
 
-// CloseableReader is a reader interface that can close its reading end.
+// CloseableReader is an [io.Reader] interface that can close its reading end.
 type CloseableReader interface {
 	io.Reader
 	CloseRead() error
 }
 
-// CloseableWriter is a writer that can close its writing end.
+// CloseableWriter is an [io.Writer] that can close its writing end.
 type CloseableWriter interface {
 	io.Writer
 	CloseWrite() error
 }
 
-// Conn is an extension of net.Conn that can close its ends. This mostly
+// Conn is an extension of [net.Conn] that can close its ends. This mostly
 // implies TCP connections.
 type Conn interface {
 	net.Conn

events/event_stream.go

 	"github.com/OneOfOne/xxhash"
 )
 
-// EventStream is a default implementation of the mtglib.EventStream
+// EventStream is a default implementation of the [mtglib.EventStream]
 // interface.
 //
 // EventStream manages a set of goroutines, observers. Main
 	return rv
 }
 
-func eventStreamProcessor(ctx context.Context, eventChan <-chan mtglib.Event, observer Observer) { // nolint: cyclop
+func eventStreamProcessor(ctx context.Context, eventChan <-chan mtglib.Event, observer Observer) { //nolint: cyclop
 	defer observer.Shutdown()
 
 	for {

events/init.go

 // Events has a default implementations of EventStream for mtglib.
 //
-// Please see documentation for mtglib.EventStream interface to get an
-// idea of such an abstraction. This package has implementations for the
-// default event stream.
+// Please see documentation for [mtglib.EventStream] interface to get an idea
+// of such an abstraction. This package has implementations for the default
+// event stream.
 //
-// Default event stream has a list of its own concepts. First, all it
-// does is a routing of messages to known observers. It takes an event,
-// defines its type and pass this message to a method of the observer.
+// Default event stream has a list of its own concepts. First, all it does is a
+// routing of messages to known observers. It takes an event, defines its type
+// and pass this message to a method of the observer.
 //
-// There might be many observers, but default event stream has a
-// guarantee though. It uses StreamID as a sharding key and guarantees
-// that a message with the same StreamID will be devlivered to the same
-// observer instance. So, each producer is guarateed to get all relevant
-// messages related to the same session. It is not possible that it will
-// get EventFinish if it has not seen EventStart for that session yet.
+// There might be many observers, but default event stream has a guarantee
+// though. It uses StreamID as a sharding key and guarantees that a message
+// with the same StreamID will be devlivered to the same observer instance. So,
+// each producer is guarateed to get all relevant messages related to the same
+// session. It is not possible that it will get EventFinish if it has not seen
+// EventStart for that session yet.
 package events
 
 import "github.com/9seconds/mtg/v2/mtglib"
 // Observer is an instance that listens for the incoming events.
 //
 // As it is said in the package description, the default event stream
-// guarantees that all events with the same StreamID are going to be
-// routed to the same instance of the observer. So, there is no need
-// to synchronize information about streams between many observers
-// instances, they can have their local storage.
+// guarantees that all events with the same StreamID are going to be routed to
+// the same instance of the observer. So, there is no need to synchronize
+// information about streams between many observers instances, they can have
+// their local storage.
 type Observer interface {
 	// EventStart reacts on incoming mtglib.EventStart event.
 	EventStart(mtglib.EventStart)
 
 // ObserverFactory creates a new instance of the observer.
 //
-// Default event stream creates a small set of goroutines to manage
-// incoming messages. Each message is routed to an appropriate observer
-// based on a sharding key, stream id. So, it is possible that an
-// instance of mtg will have many observer instances, not a single one.
+// Default event stream creates a small set of goroutines to manage incoming
+// messages. Each message is routed to an appropriate observer based on a
+// sharding key, stream id. So, it is possible that an instance of mtg will
+// have many observer instances, not a single one.
 type ObserverFactory func() Observer

go.mod

 
 require (
 	github.com/OneOfOne/xxhash v1.2.8
-	github.com/alecthomas/kong v0.5.0
+	github.com/alecthomas/kong v0.6.1
 	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137
 	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5
 	github.com/babolivier/go-doh-client v0.0.0-20201028162107-a76cff4cb8b6
 	github.com/gotd/td v0.34.0
 	github.com/jarcoal/httpmock v1.0.8
 	github.com/mccutchen/go-httpbin v1.1.1
-	github.com/panjf2000/ants/v2 v2.4.8
-	github.com/pelletier/go-toml v1.9.4
-	github.com/prometheus/client_golang v1.12.1
-	github.com/prometheus/common v0.32.1 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	github.com/rs/zerolog v1.26.1
+	github.com/panjf2000/ants/v2 v2.5.0
+	github.com/pelletier/go-toml v1.9.5
+	github.com/prometheus/client_golang v1.13.0
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/rs/zerolog v1.27.0
 	github.com/smira/go-statsd v1.3.2
 	github.com/stretchr/objx v0.3.0 // indirect
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.7.2
 	github.com/tylertreat/BoomFilters v0.0.0-20210315201527-1a82519a3e43
-	golang.org/x/crypto v0.0.0-20220315160706-3147a52a75dd
-	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2 // indirect
-	golang.org/x/sys v0.0.0-20220319134239-a9b59b0215f8
-	google.golang.org/protobuf v1.27.1 // indirect
+	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa
+	golang.org/x/net v0.0.0-20220225172249-27dd8689420f // indirect
+	golang.org/x/sys v0.0.0-20220804214406-8e32c043e418
+	google.golang.org/protobuf v1.28.1 // indirect
 )
 
 require (
-	github.com/txthinking/socks5 v0.0.0-20220212043548-414499347d4a
+	github.com/txthinking/socks5 v0.0.0-20220615051428-39268faee3e6
 	github.com/yl2chen/cidranger v1.0.2
 )
 
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gotd/ige v0.1.5 // indirect
 	github.com/gotd/xor v0.1.1 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect
 	github.com/txthinking/runnergroup v0.0.0-20220212043759-8da8edb7dae8 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
 	go.uber.org/zap v1.16.0 // indirect
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

 github.com/OneOfOne/xxhash v1.2.8 h1:31czK/TI9sNkxIKfaUfGlU47BAxQ0ztGgd9vPyqimf8=
 github.com/OneOfOne/xxhash v1.2.8/go.mod h1:eZbhyaAYD41SGSSsnmcpxVoRiQ/MPUTjUdIIOT9Um7Q=
 github.com/PuerkitoBio/goquery v1.6.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
-github.com/alecthomas/kong v0.5.0 h1:u8Kdw+eeml93qtMZ04iei0CFYve/WPcA5IFh+9wSskE=
-github.com/alecthomas/kong v0.5.0/go.mod h1:uzxf/HUh0tj43x1AyJROl3JT7SgsZ5m+icOv1csRhc0=
+github.com/alecthomas/kong v0.6.1 h1:1kNhcFepkR+HmasQpbiKDLylIL8yh5B5y1zPp5bJimA=
+github.com/alecthomas/kong v0.6.1/go.mod h1:JfHWDzLmbh/puW6I3V7uWenoh56YNVONW+w8eKeUr9I=
 github.com/alecthomas/repr v0.0.0-20210801044451-80ca428c5142 h1:8Uy0oSf5co/NZXje7U1z8Mpep++QJOldL2hs/sBQf48=
 github.com/alecthomas/repr v0.0.0-20210801044451-80ca428c5142/go.mod h1:2kn6fqh/zIyPLmm3ugklbEi5hg5wS435eygvNfaDQL8=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/d4l3k/messagediff v1.2.1 h1:ZcAIMYsUg0EAp9X+tt8/enBE/Q8Yd5kzPynLyKptt9U=
 github.com/d4l3k/messagediff v1.2.1/go.mod h1:Oozbb1TVXFac9FtSIxHBMnBCq2qeH/2KkEQxENCrlLo=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
+github.com/go-kit/log v0.2.0/go.mod h1:NwTd00d/i8cPZ3xOwwiv2PO5MOcx78fFErGNcVmBjv0=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
+github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/go-openapi/inflect v0.19.0/go.mod h1:lHpZVlpIQqLyKwJ4N+YSc9hchQy/i12fJykb83CRBH4=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/martian/v3 v3.0.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
+github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
 github.com/mattn/go-isatty v0.0.9/go.mod h1:YNRxwqDuOph6SZLI9vUUz6OYw3QyUt7WiY2yME+cCiQ=
+github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
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 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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-golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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-golang.org/x/sys v0.0.0-20220319134239-a9b59b0215f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20200729194436-6467de6f59a7/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200804011535-6c149bb5ef0d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200820010801-b793a1359eac/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
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 golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
-golang.org/x/tools v0.1.7 h1:6j8CgantCy3yc8JGBqkDLMKWqZ0RDU2g1HVgacojGWQ=
-golang.org/x/tools v0.1.7/go.mod h1:LGqMHiF4EqQNHR1JncWGqT5BVaXmza+X+BDGol+dOxo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
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 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
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internal/cli/access.go

 type accessResponseURLs struct {
 	IP        net.IP `json:"ip"`
 	Port      uint   `json:"port"`
-	TgURL     string `json:"tg_url"`     // nolint: tagliatelle
-	TgQrCode  string `json:"tg_qrcode"`  // nolint: tagliatelle
-	TmeURL    string `json:"tme_url"`    // nolint: tagliatelle
-	TmeQrCode string `json:"tme_qrcode"` // nolint: tagliatelle
+	TgURL     string `json:"tg_url"`     //nolint: tagliatelle
+	TgQrCode  string `json:"tg_qrcode"`  //nolint: tagliatelle
+	TmeURL    string `json:"tme_url"`    //nolint: tagliatelle
+	TmeQrCode string `json:"tme_qrcode"` //nolint: tagliatelle
 }
 
 type Access struct {
-	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"`                 // nolint: lll
-	PublicIPv4 net.IP `kong:"help='Public IPv4 address for proxy. By default it is resolved via remote website',name='ipv4',short='i'"`   // nolint: lll
-	PublicIPv6 net.IP `kong:"help='Public IPv6 address for proxy. By default it is resolved via remote website',name='ipv6',short='I'"`   // nolint: lll
-	Port       uint   `kong:"help='Port number. Default port is taken from configuration file, bind-to parameter',type:'uint',short='p'"` // nolint: lll
+	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"`                 //nolint: lll
+	PublicIPv4 net.IP `kong:"help='Public IPv4 address for proxy. By default it is resolved via remote website',name='ipv4',short='i'"`   //nolint: lll
+	PublicIPv6 net.IP `kong:"help='Public IPv6 address for proxy. By default it is resolved via remote website',name='ipv6',short='I'"`   //nolint: lll
+	Port       uint   `kong:"help='Port number. Default port is taken from configuration file, bind-to parameter',type:'uint',short='p'"` //nolint: lll
 	Hex        bool   `kong:"help='Print secret in hex encoding.',short='x'"`
 }
 
 	}
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2) // nolint: gomnd
+	wg.Add(2) //nolint: gomnd
 
 	go func() {
 		defer wg.Done()
 
 func (a *Access) getIP(ntw mtglib.Network, protocol string) net.IP {
 	client := ntw.MakeHTTPClient(func(ctx context.Context, network, address string) (essentials.Conn, error) {
-		return ntw.DialContext(ctx, protocol, address) // nolint: wrapcheck
+		return ntw.DialContext(ctx, protocol, address) //nolint: wrapcheck
 	})
 
-	req, err := http.NewRequest(http.MethodGet, "https://ifconfig.co", nil) // nolint: noctx
+	req, err := http.NewRequest(http.MethodGet, "https://ifconfig.co", nil) //nolint: noctx
 	if err != nil {
 		panic(err)
 	}
 	}
 
 	defer func() {
-		io.Copy(io.Discard, resp.Body) // nolint: errcheck
+		io.Copy(io.Discard, resp.Body) //nolint: errcheck
 		resp.Body.Close()
 	}()
 

internal/cli/generate_secret.go

 	secret := mtglib.GenerateSecret(cli.GenerateSecret.HostName)
 
 	if g.Hex {
-		fmt.Println(secret.Hex()) // nolint: forbidigo
+		fmt.Println(secret.Hex()) //nolint: forbidigo
 	} else {
-		fmt.Println(secret.Base64()) // nolint: forbidigo
+		fmt.Println(secret.Base64()) //nolint: forbidigo
 	}
 
 	return nil

internal/cli/run.go

 )
 
 type Run struct {
-	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"` // nolint: lll
+	ConfigPath string `kong:"arg,required,type='existingfile',help='Path to the configuration file.',name='config-path'"` //nolint: lll
 }
 
 func (r *Run) Run(cli *CLI, version string) error {

internal/cli/run_proxy.go

 	}
 
 	if len(conf.Network.Proxies) == 0 {
-		return network.NewNetwork(baseDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
+		return network.NewNetwork(baseDialer, userAgent, dohIP, httpTimeout) //nolint: wrapcheck
 	}
 
 	proxyURLs := make([]*url.URL, 0, len(conf.Network.Proxies))
 			return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
 		}
 
-		return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
+		return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) //nolint: wrapcheck
 	}
 
 	socksDialer, err := network.NewLoadBalancedSocks5Dialer(baseDialer, proxyURLs)
 		return nil, fmt.Errorf("cannot build socks5 dialer: %w", err)
 	}
 
-	return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) // nolint: wrapcheck
+	return network.NewNetwork(socksDialer, userAgent, dohIP, httpTimeout) //nolint: wrapcheck
 }
 
 func makeAntiReplayCache(conf *config.Config) mtglib.AntiReplayCache {
 	logger mtglib.Logger,
 	ntw mtglib.Network,
 	updateCallback ipblocklist.FireholUpdateCallback,
-) (allowlist mtglib.IPBlocklist, err error) {
+) (mtglib.IPBlocklist, error) {
+	var (
+		allowlist mtglib.IPBlocklist
+		err       error
+	)
+
 	if !conf.Enabled.Get(false) {
 		allowlist, err = ipblocklist.NewFireholFromFiles(
 			logger.Named("ipblocklist"),
 }
 
 func makeEventStream(conf *config.Config, logger mtglib.Logger) (mtglib.EventStream, error) {
-	factories := make([]events.ObserverFactory, 0, 2) // nolint: gomnd
+	factories := make([]events.ObserverFactory, 0, 2) //nolint: gomnd
 
 	if conf.Stats.StatsD.Enabled.Get(false) {
 		statsdFactory, err := stats.NewStatsd(
 			return nil, fmt.Errorf("cannot start a listener for prometheus: %w", err)
 		}
 
-		go prometheus.Serve(listener) // nolint: errcheck
+		go prometheus.Serve(listener) //nolint: errcheck
 
 		factories = append(factories, prometheus.Make)
 	}
 	return events.NewNoopStream(), nil
 }
 
-func runProxy(conf *config.Config, version string) error { // nolint: funlen
+func runProxy(conf *config.Config, version string) error { //nolint: funlen
 	logger := makeLogger(conf)
 
 	logger.BindJSON("configuration", conf.String()).Debug("configuration")
 
 	ctx := utils.RootContext()
 
-	go proxy.Serve(listener) // nolint: errcheck
+	go proxy.Serve(listener) //nolint: errcheck
 
 	<-ctx.Done()
 	listener.Close()

internal/cli/simple_run.go

 	BindTo string `kong:"arg,required,name='bind-to',help='A host:port to bind proxy to.'"`
 	Secret string `kong:"arg,required,name='secret',help='Proxy secret.'"`
 
-	Debug               bool          `kong:"name='debug',short='d',help='Run in debug mode.'"`                                                                        // nolint: lll
-	Concurrency         uint64        `kong:"name='concurrency',short='c',default='8192',help='Max number of concurrent connection to proxy.'"`                        // nolint: lll
-	TCPBuffer           string        `kong:"name='tcp-buffer',short='b',default='4KB',help='Deprecated and ignored'"`                                                 // nolint: lll
-	PreferIP            string        `kong:"name='prefer-ip',short='i',default='prefer-ipv6',help='IP preference. By default we prefer IPv6 with fallback to IPv4.'"` // nolint: lll
-	DomainFrontingPort  uint64        `kong:"name='domain-fronting-port',short='p',default='443',help='A port to access for domain fronting.'"`                        // nolint: lll
-	DOHIP               net.IP        `kong:"name='doh-ip',short='n',default='9.9.9.9',help='IP address of DNS-over-HTTP to use.'"`                                    // nolint: lll
-	Timeout             time.Duration `kong:"name='timeout',short='t',default='10s',help='Network timeout to use'"`                                                    // nolint: lll
-	AntiReplayCacheSize string        `kong:"name='antireplay-cache-size',short='a',default='1MB',help='A size of anti-replay cache to use.'"`                         // nolint: lll
+	Debug               bool          `kong:"name='debug',short='d',help='Run in debug mode.'"`                                                                        //nolint: lll
+	Concurrency         uint64        `kong:"name='concurrency',short='c',default='8192',help='Max number of concurrent connection to proxy.'"`                        //nolint: lll
+	TCPBuffer           string        `kong:"name='tcp-buffer',short='b',default='4KB',help='Deprecated and ignored'"`                                                 //nolint: lll
+	PreferIP            string        `kong:"name='prefer-ip',short='i',default='prefer-ipv6',help='IP preference. By default we prefer IPv6 with fallback to IPv4.'"` //nolint: lll
+	DomainFrontingPort  uint64        `kong:"name='domain-fronting-port',short='p',default='443',help='A port to access for domain fronting.'"`                        //nolint: lll
+	DOHIP               net.IP        `kong:"name='doh-ip',short='n',default='9.9.9.9',help='IP address of DNS-over-HTTP to use.'"`                                    //nolint: lll
+	Timeout             time.Duration `kong:"name='timeout',short='t',default='10s',help='Network timeout to use'"`                                                    //nolint: lll
+	AntiReplayCacheSize string        `kong:"name='antireplay-cache-size',short='a',default='1MB',help='A size of anti-replay cache to use.'"`                         //nolint: lll
 }
 
-func (s *SimpleRun) Run(cli *CLI, version string) error { // nolint: cyclop
+func (s *SimpleRun) Run(cli *CLI, version string) error { //nolint: cyclop
 	conf := &config.Config{}
 
 	if err := conf.BindTo.Set(s.BindTo); err != nil {
 		return fmt.Errorf("incorrect secret: %w", err)
 	}
 
-	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil { // nolint: gomnd
+	if err := conf.Concurrency.Set(strconv.FormatUint(s.Concurrency, 10)); err != nil { //nolint: gomnd
 		return fmt.Errorf("incorrect concurrency: %w", err)
 	}
 
 		return fmt.Errorf("incorrect prefer-ip: %w", err)
 	}
 
-	if err := conf.DomainFrontingPort.Set(strconv.FormatUint(s.DomainFrontingPort, 10)); err != nil { // nolint: gomnd
+	if err := conf.DomainFrontingPort.Set(strconv.FormatUint(s.DomainFrontingPort, 10)); err != nil { //nolint: gomnd
 		return fmt.Errorf("incorrect domain-fronting-port: %w", err)
 	}
 

internal/config/type_concurrency.go

 }
 
 func (t *TypeConcurrency) Set(value string) error {
-	concurrencyValue, err := strconv.ParseUint(value, 10, 16) // nolint: gomnd
+	concurrencyValue, err := strconv.ParseUint(value, 10, 16) //nolint: gomnd
 	if err != nil {
 		return fmt.Errorf("value is not uint (%s): %w", value, err)
 	}
 }
 
 func (t TypeConcurrency) String() string {
-	return strconv.FormatUint(uint64(t.Value), 10) // nolint: gomnd
+	return strconv.FormatUint(uint64(t.Value), 10) //nolint: gomnd
 }

internal/config/type_error_rate.go

 }
 
 func (t *TypeErrorRate) Set(value string) error {
-	parsedValue, err := strconv.ParseFloat(value, 64) // nolint: gomnd
+	parsedValue, err := strconv.ParseFloat(value, 64) //nolint: gomnd
 	if err != nil {
 		return fmt.Errorf("value is not a float (%s): %w", value, err)
 	}
 }
 
 func (t TypeErrorRate) String() string {
-	return strconv.FormatFloat(t.Value, 'f', -1, 64) // nolint: gomnd
+	return strconv.FormatFloat(t.Value, 'f', -1, 64) //nolint: gomnd
 }

internal/config/type_hostport.go

 		return fmt.Errorf("incorrect host:port value (%v): %w", value, err)
 	}
 
-	portValue, err := strconv.ParseUint(port, 10, 16) // nolint: gomnd
+	portValue, err := strconv.ParseUint(port, 10, 16) //nolint: gomnd
 	if err != nil {
 		return fmt.Errorf("incorrect port number (%v): %w", value, err)
 	}

internal/config/type_port.go

 }
 
 func (t *TypePort) Set(value string) error {
-	portValue, err := strconv.ParseUint(value, 10, 16) // nolint: gomnd
+	portValue, err := strconv.ParseUint(value, 10, 16) //nolint: gomnd
 	if err != nil {
 		return fmt.Errorf("incorrect port number (%v): %w", value, err)
 	}

internal/testlib/capture_output.go

 	closeChan := make(chan bool)
 
 	go func() {
-		io.Copy(buf, reader) // nolint: errcheck
+		io.Copy(buf, reader) //nolint: errcheck
 		close(closeChan)
 	}()
 

internal/testlib/mtglib_network_mock.go

 func (m *MtglibNetworkMock) Dial(network, address string) (essentials.Conn, error) {
 	args := m.Called(network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck, forcetypeassert
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
 func (m *MtglibNetworkMock) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	args := m.Called(ctx, network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck, forcetypeassert
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
 func (m *MtglibNetworkMock) MakeHTTPClient(dialFunc func(ctx context.Context,
 	network, address string) (essentials.Conn, error),
 ) *http.Client {
-	return m.Called(dialFunc).Get(0).(*http.Client) // nolint: forcetypeassert
+	return m.Called(dialFunc).Get(0).(*http.Client) //nolint: forcetypeassert
 }

internal/testlib/net_conn_mock.go

 }
 
 func (n *EssentialsConnMock) Close() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) CloseRead() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) CloseWrite() error {
-	return n.Called().Error(0) // nolint: wrapcheck
+	return n.Called().Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) LocalAddr() net.Addr {
-	return n.Called().Get(0).(net.Addr) // nolint: forcetypeassert
+	return n.Called().Get(0).(net.Addr) //nolint: forcetypeassert
 }
 
 func (n *EssentialsConnMock) RemoteAddr() net.Addr {
-	return n.Called().Get(0).(net.Addr) // nolint: forcetypeassert
+	return n.Called().Get(0).(net.Addr) //nolint: forcetypeassert
 }
 
 func (n *EssentialsConnMock) SetDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) SetReadDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }
 
 func (n *EssentialsConnMock) SetWriteDeadline(t time.Time) error {
-	return n.Called(t).Error(0) // nolint: wrapcheck
+	return n.Called(t).Error(0) //nolint: wrapcheck
 }

internal/utils/net_listener.go

 func (l Listener) Accept() (net.Conn, error) {
 	conn, err := l.Listener.Accept()
 	if err != nil {
-		return nil, err // nolint: wrapcheck
+		return nil, err //nolint: wrapcheck
 	}
 
 	if err := network.SetClientSocketOptions(conn, 0); err != nil {

internal/utils/rlimit.go

-//go:build !windows
-// +build !windows
-
-package utils
-
-import (
-	"fmt"
-
-	"golang.org/x/sys/unix"
-)
-
-func SetLimits() error {
-	rLimit := unix.Rlimit{}
-	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rLimit); err != nil {
-		return fmt.Errorf("cannot get rlimit: %w", err)
-	}
-
-	rLimit.Cur = rLimit.Max
-
-	if err := unix.Setrlimit(unix.RLIMIT_NOFILE, &rLimit); err != nil {
-		return fmt.Errorf("cannot set rlimit: %w", err)
-	}
-
-	return nil
-}

internal/utils/rlimit_windows.go

-//go:build windows
-// +build windows
-
-package utils
-
-func SetLimits() error {
-	return nil
-}

ipblocklist/files/doc.go

+// files defines a set of abstraction for 'files': an openable entities that
+// could be read after.
+//
+// This is not a file on a filesystem of your local machine, it also can
+// include "in memory" files or even remote ones, like HTTP endpoints. If you
+// make a GET request to HTTP endpoint, then a body is readable and you can
+// consider it as an openable file.
+package files

ipblocklist/files/http.go

 	response, err := h.http.Do(request)
 	if err != nil {
 		if response != nil {
-			io.Copy(io.Discard, response.Body) // nolint: errcheck
+			io.Copy(io.Discard, response.Body) //nolint: errcheck
 			response.Body.Close()
 		}
 
 	return h.url
 }
 
+// NewHTTP returns a file abstraction for HTTP/HTTPS endpoint. You also need to
+// provide a valid instance of [http.Client] to access it.
 func NewHTTP(client *http.Client, endpoint string) (File, error) {
 	if client == nil {
 		return nil, ErrBadHTTPClient

ipblocklist/files/http_test.go

 }
 
 func (suite *HTTPTestSuite) makeFile(path string) (files.File, error) {
-	return files.NewHTTP(suite.httpClient, suite.httpServer.URL+"/"+path) // nolint: wrapcheck
+	return files.NewHTTP(suite.httpClient, suite.httpServer.URL+"/"+path) //nolint: wrapcheck
 }
 
 func (suite *HTTPTestSuite) SetupSuite() {

ipblocklist/files/init.go

 	"io"
 )
 
+// ErrBadHTTPClient is returned if given HTTP client is initialized
+// incorrectly.
 var ErrBadHTTPClient = errors.New("incorrect http client")
 
+// File is an abstraction for a entity that can be opened in some context.
 type File interface {
+	// Open returns an readable entity for a file. It is important to not forget
+	// to close it after the usage.
 	Open(context.Context) (io.ReadCloser, error)
+
+	// String returns a short text description for the file
 	String() string
 }

ipblocklist/files/local.go

 }
 
 func (l localFile) Open(ctx context.Context) (io.ReadCloser, error) {
-	return os.Open(l.path) // nolint: wrapcheck
+	return os.Open(l.path) //nolint: wrapcheck
 }
 
 func (l localFile) String() string {
 	return l.path
 }
 
+// NewLocal returns an openable File for a path on a local file system.
 func NewLocal(path string) (File, error) {
 	if stat, err := os.Stat(path); os.IsNotExist(err) || stat.IsDir() || stat.Mode().Perm()&0o400 == 0 {
 		return nil, fmt.Errorf("%s is not a readable file", path)

ipblocklist/files/mem.go

 	return "mem"
 }
 
+// NewMem returns an openable file that is kept in RAM.
 func NewMem(networks []*net.IPNet) File {
 	builder := strings.Builder{}
 

ipblocklist/firehol.go

 var (
 	fireholRegexpComment = regexp.MustCompile(`\s*#.*?$`)
 
-	fireholIPv4DefaultCIDR = net.CIDRMask(32, 32)   // nolint: gomnd
-	fireholIPv6DefaultCIDR = net.CIDRMask(128, 128) // nolint: gomnd
+	fireholIPv4DefaultCIDR = net.CIDRMask(32, 32)   //nolint: gomnd
+	fireholIPv6DefaultCIDR = net.CIDRMask(128, 128) //nolint: gomnd
 )
 
 // FireholUpdateCallback defines a signature of the callback that has to be
 // execute when ip list is updated.
 type FireholUpdateCallback func(context.Context, int)
 
-// Firehol is IPBlocklist which uses lists from FireHOL:
+// Firehol is [mtglib.IPBlocklist] which uses lists from FireHOL:
 // https://iplists.firehol.org/
 //
-// It can use both local files and remote URLs. This is not necessary
-// that blocklists should be taken from this website, we expect only
-// compatible formats here.
+// It can use both local files and remote URLs. This is not necessary that
+// blocklists should be taken from this website, we expect only compatible
+// formats here.
 //
 // Example of the format:
 //
-//     # this is a comment
-//     # to ignore
-//     127.0.0.1   # you can specify an IP
-//     10.0.0.0/8  # or cidr
+//	# this is a comment
+//	# to ignore
+//	127.0.0.1   # you can specify an IP
+//	10.0.0.0/8  # or cidr
 type Firehol struct {
 	ctx         context.Context
 	ctxCancel   context.CancelFunc
 
 // Run starts a background update process.
 //
-// This is a blocking method so you probably want to run it in a
-// goroutine.
+// This is a blocking method so you probably want to run it in a goroutine.
 func (f *Firehol) Run(updateEach time.Duration) {
 	if updateEach == 0 {
 		updateEach = DefaultFireholUpdateEach
 
 // NewFirehol creates a new instance of FireHOL IP blocklist.
 //
-// This method does not start an update process so please execute Run
-// when it is necessary.
+// This method does not start an update process so please execute Run when it
+// is necessary.
 func NewFirehol(logger mtglib.Logger, network mtglib.Network,
 	downloadConcurrency uint,
 	urls []string,
 	return NewFireholFromFiles(logger, downloadConcurrency, blocklists, updateCallback)
 }
 
+// NewFirehol creates a new instance of FireHOL IP blocklist.
+//
+// This method creates this instances from a given list of files.
 func NewFireholFromFiles(logger mtglib.Logger,
 	downloadConcurrency uint,
 	blocklists []files.File,

ipblocklist/firehol_test.go

 
 		defer filefp.Close()
 
-		io.Copy(w, filefp) // nolint: errcheck
+		io.Copy(w, filefp) //nolint: errcheck
 	})
 
 	suite.httpServer = httptest.NewServer(mux)

ipblocklist/init.go

 // Package ipblocklist contains default implementation of the
-// IPBlocklist for mtg.
+// [mtglib.IPBlocklist] for mtg.
 //
-// Please check documentation for mtglib.IPBlocklist interface to get an
-// idea of this abstraction.
+// Please check documentation for [mtglib.IPBlocklist] interface to get an idea
+// of this abstraction.
 package ipblocklist
 
 import "time"
 	// concurrent downloads of ip blocklists for Firehol.
 	DefaultFireholDownloadConcurrency = 1
 
-	// DefaultFireholUpdateEach defines a default time period when
-	// Firehol requests updates of the blocklists.
+	// DefaultFireholUpdateEach defines a default time period when Firehol
+	// requests updates of the blocklists.
 	DefaultFireholUpdateEach = 6 * time.Hour
 )

ipblocklist/noop.go

 func (n noop) Run(updateEach time.Duration) {}
 func (n noop) Shutdown()                    {}
 
-// NewNoop returns a dummy ipblocklist which allows all incoming
-// connections.
+// NewNoop returns a dummy ipblocklist which allows all incoming connections.
 func NewNoop() mtglib.IPBlocklist {
 	return noop{}
 }

logger/init.go

-// Package logger has implementation of loggers for mtglib.Logger
-// interface.
+// Package logger has implementation of loggers for [mtglib.Logger] interface.
 //
-// Please see a description of that interface to get some agreements
-// which are used by mtglib.
+// Please see a description of that interface to get some agreements which are
+// used by mtglib.
 package logger
 
-// StdLikeLogger is an interface which is close to log.Logger. This is
-// commonly used by many 3pp tools. While mtglib itself does not need
-// it, it is always a good idea to support it and have a transient end
-// to end logging.
+// StdLikeLogger is an interface which is close to [log.Logger]. This is
+// commonly used by many 3pp tools. While mtglib itself does not need it, it is
+// always a good idea to support it and have a transient end to end logging.
 type StdLikeLogger interface {
 	Printf(format string, args ...interface{})
 }

logger/zerolog_test.go

 	suite.NotContains("lalala", log12Output)
 }
 
-func TestZeroLogger(t *testing.T) { // nolint: paralleltest
+func TestZeroLogger(t *testing.T) { //nolint: paralleltest
 	suite.Run(t, &ZeroLoggerTestSuite{})
 }

main.go

 package main
 
 import (
-	"fmt"
 	"math/rand"
-	"runtime/debug"
-	"strconv"
 	"time"
 
 	"github.com/9seconds/mtg/v2/internal/cli"
-	"github.com/9seconds/mtg/v2/internal/utils"
 	"github.com/alecthomas/kong"
 )
 
-var version = "dev" // has to be set by ldflags
-
 func main() {
 	rand.Seed(time.Now().UTC().UnixNano())
 
-	if err := utils.SetLimits(); err != nil {
-		panic(err)
-	}
-
-	if buildInfo, ok := debug.ReadBuildInfo(); ok {
-		vcsCommit := "<no-commit>"
-		vcsDate := time.Now()
-		vcsDirty := ""
-
-		for _, setting := range buildInfo.Settings {
-			switch setting.Key {
-			case "vcs.time":
-				vcsDate, _ = time.Parse(time.RFC3339, setting.Value)
-			case "vcs.revision":
-				vcsCommit = setting.Value
-			case "vcs.modified":
-				if isDirty, _ := strconv.ParseBool(setting.Value); isDirty {
-					vcsDirty = " [dirty]"
-				}
-			}
-		}
-
-		version = fmt.Sprintf("%s (%s: %s on %s%s)",
-			version,
-			buildInfo.GoVersion,
-			vcsDate.Format(time.RFC3339),
-			vcsCommit,
-			vcsDirty)
-	}
-
 	cli := &cli.CLI{}
 	ctx := kong.Parse(cli, kong.Vars{
-		"version": version,
+		"version": getVersion(),
 	})
 
 	ctx.FatalIfErrorf(ctx.Run(cli, version))

mtglib/conns.go

 		c.stream.Send(c.ctx, NewEventTraffic(c.streamID, uint(n), true))
 	}
 
-	return n, err // nolint: wrapcheck
+	return n, err //nolint: wrapcheck
 }
 
 func (c connTraffic) Write(b []byte) (int, error) {
 		c.stream.Send(c.ctx, NewEventTraffic(c.streamID, uint(n), false))
 	}
 
-	return n, err // nolint: wrapcheck
+	return n, err //nolint: wrapcheck
 }
 
 type connRewind struct {
 	c.mutex.RLock()
 	defer c.mutex.RUnlock()
 
-	return c.active.Read(p) // nolint: wrapcheck
+	return c.active.Read(p) //nolint: wrapcheck
 }
 
 func (c *connRewind) Rewind() {

mtglib/conns_internal_test.go

 func (c *ConnRewindBaseConn) Read(p []byte) (int, error) {
 	c.Called(p)
 
-	return c.readBuffer.Read(p) // nolint: wrapcheck
+	return c.readBuffer.Read(p) //nolint: wrapcheck
 }
 
 type ConnTrafficTestSuite struct {
 	suite.Equal(10, n)
 }
 
-func (suite *ConnTrafficTestSuite) TestReadErr() { // nolint: dupl
+func (suite *ConnTrafficTestSuite) TestReadErr() { //nolint: dupl
 	suite.eventStreamMock.
 		On("Send", mock.Anything, mock.Anything).
 		Once().
 	suite.Equal(10, n)
 }
 
-func (suite *ConnTrafficTestSuite) TestWriteErr() { // nolint: dupl
+func (suite *ConnTrafficTestSuite) TestWriteErr() { //nolint: dupl
 	suite.eventStreamMock.
 		On("Send", mock.Anything, mock.Anything).
 		Once().

mtglib/events.go

 	RemoteIP net.IP
 }
 
-// EventConnectedToDC is emitted when mtg proxy has connected to a
-// Telegram server.
+// EventConnectedToDC is emitted when mtg proxy has connected to a Telegram
+// server.
 type EventConnectedToDC struct {
 	eventBase
 
-	// RemoteIP is an IP address of the Telegram server proxy has been
-	// connected to.
+	// RemoteIP is an IP address of the Telegram server proxy has been connected
+	// to.
 	RemoteIP net.IP
 
 	// DC is an index of the datacenter proxy has been connected to.
 	// Traffic is a count of bytes which were transmitted.
 	Traffic uint
 
-	// IsRead defines if we _read_ or _write_ to connection. A rule of
-	// thumb is simple: EventTraffic is bound to a remote connection. Not
-	// to a client one, but either to Telegram or front domain one.
+	// IsRead defines if we _read_ or _write_ to connection. A rule of thumb is
+	// simple: EventTraffic is bound to a remote connection. Not to a client one,
+	// but either to Telegram or front domain one.
 	//
-	// In the case of Telegram, isRead means that we've fetched some bytes
-	// from Telegram to send it to a client.
+	// In the case of Telegram, isRead means that we've fetched some bytes from
+	// Telegram to send it to a client.
 	//
-	// In the case of the front domain, it means that we've fetched some
-	// bytes from this domain to send it to a client.
+	// In the case of the front domain, it means that we've fetched some bytes
+	// from this domain to send it to a client.
 	IsRead bool
 }
 
 	eventBase
 }
 
-// EventDomainFronting is emitted when we connect to a front domain
-// instead of Telegram server.
+// EventDomainFronting is emitted when we connect to a front domain instead of
+// Telegram server.
 type EventDomainFronting struct {
 	eventBase
 }
 
-// EventConcurrencyLimited is emitted when connection was declined
-// because of the concurrency limit of the worker pool.
+// EventConcurrencyLimited is emitted when connection was declined because of
+// the concurrency limit of the worker pool.
 type EventConcurrencyLimited struct {
 	eventBase
 }
 
-// EventIPBlocklisted is emitted when connection was declined because
-// IP address was found in IP blocklist.
+// EventIPBlocklisted is emitted when connection was declined because IP
+// address was found in IP blocklist.
 type EventIPBlocklisted struct {
 	eventBase
 

mtglib/init.go

 // mtglib defines a package with MTPROTO proxy.
 //
-// Since mtg itself is build as an example of how to work with mtglib,
-// it worth to telling a couple of words about a project organization.
+// Since mtg itself is build as an example of how to work with mtglib, it worth
+// to telling a couple of words about a project organization.
 //
-// A core object of the project is mtglib.Proxy. This is a proxy you
-// expect: that one which you configure, set to serve on a listener
-// and/or shutdown on application termination.
+// A core object of the project is [mtglib.Proxy]. This is a proxy you expect:
+// that one which you configure, set to serve on a listener and/or shutdown on
+// application termination.
 //
-// But it also has a core logic unrelated to Telegram per se: anti
-// replay cache, network connectivity (who knows, maybe you want to have
-// a native VMESS integration) and so on.
+// But it also has a core logic unrelated to Telegram per se: anti replay
+// cache, network connectivity (who knows, maybe you want to have a native
+// VMESS integration) and so on.
 //
-// You can supply such parts to a proxy with interfaces. The rest of
-// the packages in mtg define some default implementations of these
-// interfaces. But if you want to integrate it with, let say, influxdb,
-// you can do it easily.
+// You can supply such parts to a proxy with interfaces. The rest of the
+// packages in mtg define some default implementations of these interfaces. But
+// if you want to integrate it with, let say, influxdb, you can do it easily.
 package mtglib
 
 import (
 )
 
 var (
-	// ErrSecretEmpty is returned if you are trying to create a proxy
-	// but do not provide a secret.
+	// ErrSecretEmpty is returned if you are trying to create a proxy but do not
+	// provide a secret.
 	ErrSecretEmpty = errors.New("secret is empty")
 
-	// ErrSecretInvalid is returned if you are trying to create a proxy
-	// but secret value is invalid (no host or payload are zeroes).
+	// ErrSecretInvalid is returned if you are trying to create a proxy but secret
+	// value is invalid (no host or payload are zeroes).
 	ErrSecretInvalid = errors.New("secret is invalid")
 
-	// ErrNetworkIsNotDefined is returned if you are trying to create a
-	// proxy but network value is undefined.
+	// ErrNetworkIsNotDefined is returned if you are trying to create a proxy but
+	// network value is undefined.
 	ErrNetworkIsNotDefined = errors.New("network is not defined")
 
-	// ErrAntiReplayCacheIsNotDefined is returned if you are trying to
-	// create a proxy but anti replay cache value is undefined.
+	// ErrAntiReplayCacheIsNotDefined is returned if you are trying to create a
+	// proxy but anti replay cache value is undefined.
 	ErrAntiReplayCacheIsNotDefined = errors.New("anti-replay cache is not defined")
 
-	// ErrIPBlocklistIsNotDefined is returned if you are trying to
-	// create a proxy but ip blocklist instance is not defined.
+	// ErrIPBlocklistIsNotDefined is returned if you are trying to create a proxy
+	// but ip blocklist instance is not defined.
 	ErrIPBlocklistIsNotDefined = errors.New("ip blocklist is not defined")
 
-	// ErrIPAllowlistIsNotDefined is returned if you are trying to
-	// create a proxy but ip allowlist instance is not defined.
+	// ErrIPAllowlistIsNotDefined is returned if you are trying to create a proxy
+	// but ip allowlist instance is not defined.
 	ErrIPAllowlistIsNotDefined = errors.New("ip allowlist is not defined")
 
-	// ErrEventStreamIsNotDefined is returned if you are trying to create a
-	// proxy but event stream instance is not defined.
+	// ErrEventStreamIsNotDefined is returned if you are trying to create a proxy
+	// but event stream instance is not defined.
 	ErrEventStreamIsNotDefined = errors.New("event stream is not defined")
 
-	// ErrLoggerIsNotDefined is returned if you are trying to
-	// create a proxy but logger is not defined.
+	// ErrLoggerIsNotDefined is returned if you are trying to create a proxy but
+	// logger is not defined.
 	ErrLoggerIsNotDefined = errors.New("logger is not defined")
 )
 
 const (
-	// DefaultConcurrency is a default max count of simultaneously
-	// connected clients.
+	// DefaultConcurrency is a default max count of simultaneously connected
+	// clients.
 	DefaultConcurrency = 4096
 
 	// DefaultBufferSize is a default size of a copy buffer.
 	// Deprecated: this setting no longer makes any effect.
 	DefaultBufferSize = 16 * 1024 // 16 kib
 
-	// DefaultDomainFrontingPort is a default port (HTTPS) to connect to in
-	// case of probe-resistance activity.
+	// DefaultDomainFrontingPort is a default port (HTTPS) to connect to in case
+	// of probe-resistance activity.
 	DefaultDomainFrontingPort = 443
 
-	// DefaultIdleTimeout is a default timeout for closing a connection
-	// in case of idling.
+	// DefaultIdleTimeout is a default timeout for closing a connection in case of
+	// idling.
 	//
-	// Deprecated: no longer in use because of changed TCP relay
-	// algorithm.
+	// Deprecated: no longer in use because of changed TCP relay algorithm.
 	DefaultIdleTimeout = time.Minute
 
-	// DefaultTolerateTimeSkewness is a default timeout for time
-	// skewness on a faketls timeout verification.
+	// DefaultTolerateTimeSkewness is a default timeout for time skewness on a
+	// faketls timeout verification.
 	DefaultTolerateTimeSkewness = 3 * time.Second
 
-	// DefaultPreferIP is a default value for Telegram IP connectivity
-	// preference.
+	// DefaultPreferIP is a default value for Telegram IP connectivity preference.
 	DefaultPreferIP = "prefer-ipv6"
 
-	// SecretKeyLength defines a length of the secret bytes used
-	// by Telegram and a proxy.
+	// SecretKeyLength defines a length of the secret bytes used by Telegram and a
+	// proxy.
 	SecretKeyLength = 16
 
-	// ConnectionIDBytesLength defines a count of random bytes used to generate
-	// a stream/connection ids.
+	// ConnectionIDBytesLength defines a count of random bytes used to generate a
+	// stream/connection ids.
 	ConnectionIDBytesLength = 16
 
 	// TCPRelayReadTimeout defines a max time period between two consecuitive
 	TCPRelayReadTimeout = 20 * time.Second
 )
 
-// Network defines a knowledge how to work with a network. It may sound
-// fun but it encapsulates all the knowledge how to properly establish
-// connections to remote hosts and configure HTTP clients.
+// Network defines a knowledge how to work with a network. It may sound fun but
+// it encapsulates all the knowledge how to properly establish connections to
+// remote hosts and configure HTTP clients.
 //
-// For example, if you want to use SOCKS5 proxy, you probably want to
-// have all traffic routed to this proxy: telegram connections, http
-// requests and so on. This knowledge is encapsulated into instances of
-// such interface.
+// For example, if you want to use SOCKS5 proxy, you probably want to have all
+// traffic routed to this proxy: telegram connections, http requests and so on.
+// This knowledge is encapsulated into instances of such interface.
 //
 // mtglib uses Network for:
-//
-// 1. Dialing to Telegram
-//
-// 2. Dialing to front domain
-//
-// 3. Doing HTTP requests (for example, for FireHOL ipblocklist).
+//  1. Dialing to Telegram
+//  2. Dialing to front domain
+//  3. Doing HTTP requests (for example, for FireHOL ipblocklist).
 type Network interface {
 	// Dial establishes context-free TCP connections.
 	Dial(network, address string) (essentials.Conn, error)
 
-	// DialContext dials using a context. This is a preferrable
-	// way of establishing TCP connections.
+	// DialContext dials using a context. This is a preferrable way of
+	// establishing TCP connections.
 	DialContext(ctx context.Context, network, address string) (essentials.Conn, error)
 
-	// MakeHTTPClient build an HTTP client with given dial function. If
-	// nothing is provided, then DialContext of this interface is going
-	// to be used.
+	// MakeHTTPClient build an HTTP client with given dial function. If nothing is
+	// provided, then DialContext of this interface is going to be used.
 	MakeHTTPClient(func(ctx context.Context, network, address string) (essentials.Conn, error)) *http.Client
 }
 
-// AntiReplayCache is an interface that is used to detect replay attacks
-// based on some traffic fingerprints.
+// AntiReplayCache is an interface that is used to detect replay attacks based
+// on some traffic fingerprints.
 //
-// Replay attacks are probe attacks whose main goal is to identify if
-// server software can be classified in some way. For example, if you
-// send some HTTP request to a web server, then you can expect that this
-// server will respond with HTTP response back.
+// Replay attacks are probe attacks whose main goal is to identify if server
+// software can be classified in some way. For example, if you send some HTTP
+// request to a web server, then you can expect that this server will respond
+// with HTTP response back.
 //
-// There is a problem though. Let's imagine, that connection is
-// encrypted. Let's imagine, that it is encrypted with some static key
-// like ShadowSocks (https://shadowsocks.org/assets/whitepaper.pdf).
-// In that case, in theory, if you repeat the same bytes, you can get
-// the same responses. Let's imagine, that you've cracked the key. then
-// if you send the same bytes, you can decrypt a response and see its
-// structure. Based on its structure you can identify if this server is
-// SOCKS5, MTPROTO proxy etc.
+// There is a problem though. Let's imagine, that connection is encrypted.
+// Let's imagine, that it is encrypted with some static key like [ShadowSocks].
+// In that case, in theory, if you repeat the same bytes, you can get the same
+// responses. Let's imagine, that you've cracked the key. then if you send the
+// same bytes, you can decrypt a response and see its structure. Based on its
+// structure you can identify if this server is SOCKS5, MTPROTO proxy etc.
 //
-// This is just one example, maybe not the best or not the most
-// relevant. In real life, different organizations use such replay
-// attacks to perform some reverse engineering of the proxy, do some
-// statical analysis to identify server software.
+// This is just one example, maybe not the best or not the most relevant. In
+// real life, different organizations use such replay attacks to perform some
+// reverse engineering of the proxy, do some statical analysis to identify
+// server software.
 //
-// There are many ways how to protect your proxy against them. One
-// is domain fronting which is a core part of mtg. Another one is to
-// collect some 'handshake fingerprints' and forbid duplication.
+// There are many ways how to protect your proxy against them. One is domain
+// fronting which is a core part of mtg. Another one is to collect some
+// 'handshake fingerprints' and forbid duplication.
 //
-// So, it one is sending the same byte flow right after you (or a couple
-// of hours after), mtg should detect that and reject this connection
-// (or redirect to fronting domain).
+// So, it one is sending the same byte flow right after you (or a couple of
+// hours after), mtg should detect that and reject this connection (or redirect
+// to fronting domain).
+//
+// [ShadowSocks]: https://shadowsocks.org/assets/whitepaper.pdf
 type AntiReplayCache interface {
-	// Seen before checks if this set of bytes was observed before or
-	// not. If it is required to store this information somewhere else,
-	// then it has to do that.
+	// Seen before checks if this set of bytes was observed before or not. If it
+	// is required to store this information somewhere else, then it has to do
+	// that.
 	SeenBefore(data []byte) bool
 }
 
 // IPBlocklist filters requests based on IP address.
 //
-// If this filter has an IP address, then mtg closes a request without
-// reading anything from a socket. It also does not give such request to
-// a worker pool, so in worst cases you can expect that you invoke this
-// object more frequent than defined proxy concurrency.
+// If this filter has an IP address, then mtg closes a request without reading
+// anything from a socket. It also does not give such request to a worker pool,
+// so in worst cases you can expect that you invoke this object more frequent
+// than defined proxy concurrency.
 type IPBlocklist interface {
-	// Contains checks if given IP address belongs to this blocklist If.
-	// it is, a connection is terminated                               .
+	// Contains checks if given IP address belongs to this blocklist If. it is, a
+	// connection is terminated .
 	Contains(net.IP) bool
 
 	// Run starts a background update procedure for a blocklist
 	Shutdown()
 }
 
-// Event is a data structure which is populated during mtg request
-// processing lifecycle. Each request popluates many events:
-//
-// 1. Client connected
+// Event is a data structure which is populated during mtg request processing
+// lifecycle. Each request popluates many events:
+//  1. Client connected
+//  2. Request is finished
+//  3. Connection to Telegram server is established
 //
-// 2. Request is finished
-//
-// 3. Connection to Telegram server is established
-//
-// and so on. All these events are data structures but all of them
-// must conform the same interface.
+// and so on. All these events are data structures but all of them must conform
+// the same interface.
 type Event interface {
-	// StreamID returns an identifier of the stream, connection,
-	// request, you name it. All events within the same stream returns
-	// the same stream id.
+	// StreamID returns an identifier of the stream, connection, request, you name
+	// it. All events within the same stream returns the same stream id.
 	StreamID() string
 
 	// Timestamp returns a timestamp when this event was generated.
 	Timestamp() time.Time
 }
 
-// EventStream is an abstraction that accepts a set of events produced
-// by mtg. Its main goal is to inject your logging or monitoring system.
+// EventStream is an abstraction that accepts a set of events produced by mtg.
+// Its main goal is to inject your logging or monitoring system.
 //
-// The idea is simple. When mtg works, it emits a set of events during
-// a lifecycle of the requestor: EventStart, EventFinish etc. mtg is a
-// producer which puts these events into a stream. Responsibility of
-// the stream is to deliver this event to consumers/observers. There
-// might be many different observers (for example, you want to have both
-// statsd and prometheus), mtg should know nothing about them.
+// The idea is simple. When mtg works, it emits a set of events during a
+// lifecycle of the requestor: EventStart, EventFinish etc. mtg is a producer
+// which puts these events into a stream. Responsibility of the stream is to
+// deliver this event to consumers/observers. There might be many different
+// observers (for example, you want to have both statsd and prometheus), mtg
+// should know nothing about them.
 type EventStream interface {
-	// Send delivers an event to observers. Given context has to be
-	// respected. If the context is closed, all blocking operations should
-	// be released ASAP.
+	// Send delivers an event to observers. Given context has to be respected. If
+	// the context is closed, all blocking operations should be released ASAP.
 	//
 	// It is possible that context is closed but the message is delivered.
 	// EventStream implementations should solve this issue somehow.
 
 // Logger defines an interface of the logger used by mtglib.
 //
-// Each logger has a name. It is possible to stack names to organize
-// poor-man namespaces. Also, each logger must be able to bind
-// parameters to avoid pushing them all the time.
+// Each logger has a name. It is possible to stack names to organize poor-man
+// namespaces. Also, each logger must be able to bind parameters to avoid
+// pushing them all the time.
 //
 // Example
 //
-//     logger := SomeLogger{}
-//     logger = logger.BindStr("ip", net.IP{127, 0, 0, 1})
-//     logger.Info("Hello")
+//	logger := SomeLogger{} logger = logger.BindStr("ip", net.IP{127, 0, 0, 1})
+//	logger.Info("Hello")
 //
-// In that case, ip is bound as a parameter. It is a great idea to
-// put this parameter somewhere in a log message.
+// In that case, ip is bound as a parameter. It is a great idea to put this
+// parameter somewhere in a log message.
 //
-//     logger1 = logger.BindStr("param1", "11")
-//     logger2 = logger.BindInt("param2", 11)
+//	logger1 = logger.BindStr("param1", "11") logger2 = logger.BindInt("param2",
+//	11)
 //
 // logger1 should see no param2 and vice versa, logger2 should not see param1
 // If you attach a parameter to a logger, parents should not know about that.
 type Logger interface {
-	// Named returns a new logger with a bound name. Name chaining is
-	// allowed and appreciated.
+	// Named returns a new logger with a bound name. Name chaining is allowed and
+	// appreciated.
 	Named(name string) Logger
 
 	// BindInt binds new integer parameter to a new logger instance.
 	// Info puts a message about some normal situation.
 	Info(msg string)
 
-	// InfoError puts a message about some normal situation but this
-	// situation is related to a given error.
+	// InfoError puts a message about some normal situation but this situation is
+	// related to a given error.
 	InfoError(msg string, err error)
 
-	// Warning puts a message about some extraordinary situation
-	// worth to look at.
+	// Warning puts a message about some extraordinary situation worth to look at.
 	Warning(msg string)
 
-	// WarningError puts a message about some extraordinary situation
-	// worth to look at. This situation is related to a given error.
+	// WarningError puts a message about some extraordinary situation worth to
+	// look at. This situation is related to a given error.
 	WarningError(msg string, err error)
 
 	// Debug puts a message useful for debugging only.
 	Debug(msg string)
 
-	// Debug puts a message useful for debugging only. This message is
-	// related to a given error.
+	// Debug puts a message useful for debugging only. This message is related to
+	// a given error.
 	DebugError(msg string, err error)
 }

mtglib/internal/faketls/client_hello.go

 	if len(handshake)-4 != int(handshakeLength) {
 		return hello,
 			fmt.Errorf("incorrect handshake size. manifested=%d, real=%d",
-				handshakeLength, len(handshake)-4) // nolint: gomnd
+				handshakeLength, len(handshake)-4) //nolint: gomnd
 	}
 
 	copy(hello.Random[:], handshake[ClientHelloRandomOffset:])
 	// mac is calculated for the whole record, not only
 	// for the payload part
 	mac := hmac.New(sha256.New, secret)
-	rec.Dump(mac) // nolint: errcheck
+	rec.Dump(mac) //nolint: errcheck
 
 	computedRandom := mac.Sum(nil)
 
 }
 
 func parseCipherSuite(hello *ClientHello, handshake []byte) {
-	cipherSuiteOffset := ClientHelloSessionIDOffset + len(hello.SessionID) + 3 // nolint: gomnd
+	cipherSuiteOffset := ClientHelloSessionIDOffset + len(hello.SessionID) + 3 //nolint: gomnd
 	hello.CipherSuite = binary.BigEndian.Uint16(handshake[cipherSuiteOffset : cipherSuiteOffset+2])
 }
 

mtglib/internal/faketls/conn.go

 
 	for {
 		if err := rec.Read(c.Conn); err != nil {
-			return 0, err // nolint: wrapcheck
+			return 0, err //nolint: wrapcheck
 		}
 
-		switch rec.Type { // nolint: exhaustive
+		switch rec.Type { //nolint: exhaustive
 		case record.TypeApplicationData:
-			rec.Payload.WriteTo(&c.readBuffer) // nolint: errcheck
+			rec.Payload.WriteTo(&c.readBuffer) //nolint: errcheck
 
-			return c.readBuffer.Read(p) // nolint: wrapcheck
+			return c.readBuffer.Read(p) //nolint: wrapcheck
 		case record.TypeChangeCipherSpec:
 		default:
 			return 0, fmt.Errorf("unsupported record type %v", rec.Type)
 
 		rec.Payload.Reset()
 		rec.Payload.Write(p[:chunkSize])
-		rec.Dump(sendBuffer) // nolint: errcheck
+		rec.Dump(sendBuffer) //nolint: errcheck
 
 		p = p[chunkSize:]
 	}
 
 	if _, err := c.Conn.Write(sendBuffer.Bytes()); err != nil {
-		return 0, err // nolint: wrapcheck
+		return 0, err //nolint: wrapcheck
 	}
 
 	return lenP, nil

mtglib/internal/faketls/conn_test.go

 func (m *ConnMock) Read(p []byte) (int, error) {
 	m.Called(p)
 
-	return m.readBuffer.Read(p) // nolint: wrapcheck
+	return m.readBuffer.Read(p) //nolint: wrapcheck
 }
 
 func (m *ConnMock) Write(p []byte) (int, error) {
 	m.Called(p)
 
-	return m.writeBuffer.Write(p) // nolint: wrapcheck
+	return m.writeBuffer.Write(p) //nolint: wrapcheck
 }
 
 type ConnTestSuite struct {
 	rec.Version = record.Version12
 
 	rec.Payload.WriteByte(0x01)
-	rec.Dump(&suite.connMock.readBuffer) // nolint: errcheck
+	rec.Dump(&suite.connMock.readBuffer) //nolint: errcheck
 	rec.Reset()
 
 	rec.Type = record.TypeApplicationData
 	rec.Version = record.Version12
 
 	rec.Payload.Write([]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
-	rec.Dump(&suite.connMock.readBuffer) // nolint: errcheck
+	rec.Dump(&suite.connMock.readBuffer) //nolint: errcheck
 
 	resultBuffer := &bytes.Buffer{}
 	buf := make([]byte, 2)
 	rec.Version = record.Version12
 
 	rec.Payload.WriteByte(0x01)
-	rec.Dump(&suite.connMock.readBuffer) // nolint: errcheck
+	rec.Dump(&suite.connMock.readBuffer) //nolint: errcheck
 	rec.Reset()
 
 	rec.Type = record.TypeHandshake
 	rec.Version = record.Version12
 
 	rec.Payload.Write([]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10})
-	rec.Dump(&suite.connMock.readBuffer) // nolint: errcheck
+	rec.Dump(&suite.connMock.readBuffer) //nolint: errcheck
 
 	buf := make([]byte, 2)
 
 
 		suite.Equal(record.TypeApplicationData, rec.Type)
 		suite.Equal(record.Version12, rec.Version)
-		rec.Payload.WriteTo(buf) // nolint: errcheck
+		rec.Payload.WriteTo(buf) //nolint: errcheck
 	}
 
 	suite.Equal(dataToRec, buf.Bytes())

mtglib/internal/faketls/pools.go

 }
 
 func acquireBytesBuffer() *bytes.Buffer {
-	return bytesBufferPool.Get().(*bytes.Buffer) // nolint: forcetypeassert
+	return bytesBufferPool.Get().(*bytes.Buffer) //nolint: forcetypeassert
 }
 
 func releaseBytesBuffer(b *bytes.Buffer) {

mtglib/internal/faketls/record/pools.go

 }
 
 func AcquireRecord() *Record {
-	return recordPool.Get().(*Record) // nolint: forcetypeassert
+	return recordPool.Get().(*Record) //nolint: forcetypeassert
 }
 
 func ReleaseRecord(r *Record) {

mtglib/internal/faketls/welcome.go

 	rec.Version = record.Version12
 
 	generateServerHello(&rec.Payload, clientHello)
-	rec.Dump(buf) // nolint: errcheck
+	rec.Dump(buf) //nolint: errcheck
 	rec.Reset()
 
 	rec.Type = record.TypeChangeCipherSpec
 	rec.Version = record.Version12
 	rec.Payload.WriteByte(ChangeCipherValue)
 
-	rec.Dump(buf) // nolint: errcheck
+	rec.Dump(buf) //nolint: errcheck
 	rec.Reset()
 
 	rec.Type = record.TypeApplicationData
 	rec.Version = record.Version12
 
-	if _, err := io.CopyN(&rec.Payload, rand.Reader, int64(1024+mrand.Intn(3092))); err != nil { // nolint: gomnd
+	if _, err := io.CopyN(&rec.Payload, rand.Reader, int64(1024+mrand.Intn(3092))); err != nil { //nolint: gomnd
 		panic(err)
 	}
 
-	rec.Dump(buf) // nolint: errcheck
+	rec.Dump(buf) //nolint: errcheck
 
 	packet := buf.Bytes()
 	mac := hmac.New(sha256.New, secret)
 	copy(packet[WelcomePacketRandomOffset:], mac.Sum(nil))
 
 	if _, err := writer.Write(packet); err != nil {
-		return err // nolint: wrapcheck
+		return err //nolint: wrapcheck
 	}
 
 	return nil
 	binary.BigEndian.PutUint32(header[:], uint32(bodyBuf.Len()))
 	header[0] = HandshakeTypeServer
 
-	writer.Write(header[:]) // nolint: errcheck
-	bodyBuf.WriteTo(writer) // nolint: errcheck
+	writer.Write(header[:]) //nolint: errcheck
+	bodyBuf.WriteTo(writer) //nolint: errcheck
 }

mtglib/internal/obfuscated2/client_handshake_test.go

 
 func (suite *ClientHandshakeTestSuite) TestCannotRead() {
 	buf := bytes.NewBuffer([]byte{1, 2, 3})
-	_, _, _, err := obfuscated2.ClientHandshake([]byte{1, 2, 3}, buf) // nolint: dogsled
+	_, _, _, err := obfuscated2.ClientHandshake([]byte{1, 2, 3}, buf) //nolint: dogsled
 
 	suite.Error(err)
 }

mtglib/internal/obfuscated2/conn.go

 func (c Conn) Read(p []byte) (int, error) {
 	n, err := c.Conn.Read(p)
 	if err != nil {
-		return n, err // nolint: wrapcheck
+		return n, err //nolint: wrapcheck
 	}
 
 	c.Decryptor.XORKeyStream(p, p[:n])
 	payload := buf.Bytes()
 	c.Encryptor.XORKeyStream(payload, payload)
 
-	return c.Conn.Write(payload) // nolint: wrapcheck
+	return c.Conn.Write(payload) //nolint: wrapcheck
 }

mtglib/internal/obfuscated2/handshake_frame.go

 
 // A structure of obfuscated2 handshake frame is following:
 //
-//    [frameOffsetFirst:frameOffsetKey:frameOffsetIV:frameOffsetMagic:frameOffsetDC:frameOffsetEnd].
+//	[frameOffsetFirst:frameOffsetKey:frameOffsetIV:frameOffsetMagic:frameOffsetDC:frameOffsetEnd].
 //
-//    - 8 bytes of noise
-//    - 32 bytes of AES Key
-//    - 16 bytes of AES IV
-//    - 4 bytes of 'connection type' - this has some setting like a connection type
-//    - 2 bytes of 'DC'. DC is little endian int16
-//    - 2 bytes of noise
+//	- 8 bytes of noise
+//	- 32 bytes of AES Key
+//	- 16 bytes of AES IV
+//	- 4 bytes of 'connection type' - this has some setting like a connection type
+//	- 2 bytes of 'DC'. DC is little endian int16
+//	- 2 bytes of noise
 type handshakeFrame struct {
 	data [handshakeFrameLen]byte
 }
 
 func (h *handshakeFrame) dc() int {
-	idx := int16(h.data[handshakeFrameOffsetDC]) | int16(h.data[handshakeFrameOffsetDC+1])<<8 // nolint: gomnd, lll // little endian for int16 is here
+	idx := int16(h.data[handshakeFrameOffsetDC]) | int16(h.data[handshakeFrameOffsetDC+1])<<8 //nolint: gomnd, lll // little endian for int16 is here
 
 	switch {
 	case idx > 0:

mtglib/internal/obfuscated2/handshake_frame_internal_test.go

 		suite.T().Run(strconv.Itoa(int(incoming)), func(t *testing.T) {
 			frame := handshakeFrame{}
 
-			rand.Read(frame.data[:]) // nolint: errcheck
+			rand.Read(frame.data[:]) //nolint: errcheck
 
 			frame.data[handshakeFrameOffsetDC] = byte(incoming)
 			frame.data[handshakeFrameOffsetDC+1] = byte(incoming >> 8)

mtglib/internal/obfuscated2/pools.go

 )
 
 func acquireSha256Hasher() hash.Hash {
-	return sha256HasherPool.Get().(hash.Hash) // nolint: forcetypeassert
+	return sha256HasherPool.Get().(hash.Hash) //nolint: forcetypeassert
 }
 
 func releaseSha256Hasher(h hash.Hash) {
 }
 
 func acquireBytesBuffer() *bytes.Buffer {
-	return bytesBufferPool.Get().(*bytes.Buffer) // nolint: forcetypeassert
+	return bytesBufferPool.Get().(*bytes.Buffer) //nolint: forcetypeassert
 }
 
 func releaseBytesBuffer(buf *bytes.Buffer) {

mtglib/internal/obfuscated2/server_handshake.go

 			panic(err)
 		}
 
-		if frame.data[0] == 0xef { // nolint: gomnd // taken from tg sources
+		if frame.data[0] == 0xef { //nolint: gomnd // taken from tg sources
 			continue
 		}
 
 		switch binary.LittleEndian.Uint32(frame.data[:4]) {
-		case 0x44414548, 0x54534f50, 0x20544547, 0x4954504f, 0xeeeeeeee: // nolint: gomnd // taken from tg sources
+		case 0x44414548, 0x54534f50, 0x20544547, 0x4954504f, 0xeeeeeeee: //nolint: gomnd // taken from tg sources
 			continue
 		}
 

mtglib/internal/obfuscated2/server_handshake_fuzz_test.go

 			Once().
 			Run(func(args mock.Arguments) {
 				message := make([]byte, len(data))
-				handshakeData.decryptor.XORKeyStream(message, args.Get(0).([]byte)) // nolint: forcetypeassert
+				handshakeData.decryptor.XORKeyStream(message, args.Get(0).([]byte)) //nolint: forcetypeassert
 				assert.Equal(t, message, data)
 			})
 
 			Run(func(args mock.Arguments) {
 				message := make([]byte, len(data))
 				handshakeData.encryptor.XORKeyStream(message, data)
-				copy(args.Get(0).([]byte), message) // nolint: forcetypeassert
+				copy(args.Get(0).([]byte), message) //nolint: forcetypeassert
 			})
 
 		n, err := handshakeData.proxyConn.Read(buffer)

mtglib/internal/obfuscated2/server_handshake_test.go

 		Once().
 		Run(func(args mock.Arguments) {
 			message := make([]byte, len(messageToTelegram))
-			suite.data.decryptor.XORKeyStream(message, args.Get(0).([]byte)) // nolint: forcetypeassert
+			suite.data.decryptor.XORKeyStream(message, args.Get(0).([]byte)) //nolint: forcetypeassert
 			suite.Equal(messageToTelegram, message)
 		})
 
 		Run(func(args mock.Arguments) {
 			message := make([]byte, len(messageFromTelegram))
 			suite.data.encryptor.XORKeyStream(message, messageFromTelegram)
-			copy(args.Get(0).([]byte), message) // nolint: forcetypeassert
+			copy(args.Get(0).([]byte), message) //nolint: forcetypeassert
 		})
 
 	n, err := suite.data.proxyConn.Read(buffer)

mtglib/internal/relay/pools.go

 }
 
 func acquireCopyBuffer() *[]byte {
-	return copyBufferPool.Get().(*[]byte) // nolint: forcetypeassert
+	return copyBufferPool.Get().(*[]byte) //nolint: forcetypeassert
 }
 
 func releaseCopyBuffer(buf *[]byte) {

mtglib/internal/relay/relay.go

 }
 
 func pump(log Logger, src, dst essentials.Conn, direction string) {
-	defer src.CloseRead()  // nolint: errcheck
-	defer dst.CloseWrite() // nolint: errcheck
+	defer src.CloseRead()  //nolint: errcheck
+	defer dst.CloseWrite() //nolint: errcheck
 
 	copyBuffer := acquireCopyBuffer()
 	defer releaseCopyBuffer(copyBuffer)

mtglib/proxy.go

 	return net.JoinHostPort(p.secret.Host, strconv.Itoa(p.domainFrontingPort))
 }
 
-// ServeConn serves a connection. We do not check IP blocklist and
-// concurrency limit here.
+// ServeConn serves a connection. We do not check IP blocklist and concurrency
+// limit here.
 func (p *Proxy) ServeConn(conn essentials.Conn) {
 	p.streamWaitGroup.Add(1)
 	defer p.streamWaitGroup.Done()
 			}
 		}
 
-		ipAddr := conn.RemoteAddr().(*net.TCPAddr).IP // nolint: forcetypeassert
+		ipAddr := conn.RemoteAddr().(*net.TCPAddr).IP //nolint: forcetypeassert
 		logger := p.logger.BindStr("ip", ipAddr.String())
 
 		if !p.allowlist.Contains(ipAddr) {
 	}
 }
 
-// Shutdown 'gracefully' shutdowns all connections. Please remember that
-// it does not close an underlying listener.
+// Shutdown 'gracefully' shutdowns all connections. Please remember that it
+// does not close an underlying listener.
 func (p *Proxy) Shutdown() {
 	p.ctxCancel()
 	p.streamWaitGroup.Wait()
 
 	p.eventStream.Send(ctx,
 		NewEventConnectedToDC(ctx.streamID,
-			conn.RemoteAddr().(*net.TCPAddr).IP, // nolint: forcetypeassert
+			conn.RemoteAddr().(*net.TCPAddr).IP, //nolint: forcetypeassert
 			ctx.dc),
 	)
 
 
 	pool, err := ants.NewPoolWithFunc(opts.getConcurrency(),
 		func(arg interface{}) {
-			proxy.ServeConn(arg.(essentials.Conn)) // nolint: forcetypeassert
+			proxy.ServeConn(arg.(essentials.Conn)) //nolint: forcetypeassert
 		},
 		ants.WithLogger(opts.getLogger("ants")),
 		ants.WithNonblocking(true))

mtglib/proxy_opts.go

 
 // ProxyOpts is a structure with settings to mtg proxy.
 //
-// This is not required per se, but this is to shorten function
-// signature and give an ability to conveniently provide default values.
+// This is not required per se, but this is to shorten function signature and
+// give an ability to conveniently provide default values.
 type ProxyOpts struct {
 	// Secret defines a secret which should be used by a proxy.
 	//
 	// This is a mandatory setting.
 	Secret Secret
 
-	// Network defines a network instance which should be used for all
-	// network communications made by proxies.
+	// Network defines a network instance which should be used for all network
+	// communications made by proxies.
 	//
 	// This is a mandatory setting.
 	Network Network
 
 	// BufferSize is a size of the copy buffer in bytes.
 	//
-	// Please remember that we multiply this number in 2, because when
-	// we relay between proxies, we have to create 2 intermediate
-	// buffers: to and from.
+	// Please remember that we multiply this number in 2, because when we relay
+	// between proxies, we have to create 2 intermediate buffers: to and from.
 	//
 	// This is an optional setting.
 	//
 	// This is an optional setting.
 	Concurrency uint
 
-	// IdleTimeout is a timeout for relay when we have to break a
-	// stream.
+	// IdleTimeout is a timeout for relay when we have to break a stream.
 	//
-	// This is a timeout for any activity. So, if we have any message
-	// which will pass to either direction, a timer is reset. If we have
-	// no any reads or writes for this timeout, a connection will be
-	// aborted.
+	// This is a timeout for any activity. So, if we have any message which will
+	// pass to either direction, a timer is reset. If we have no any reads or
+	// writes for this timeout, a connection will be aborted.
 	//
 	// This is an optional setting.
 	IdleTimeout time.Duration
 
-	// TolerateTimeSkewness is a time boundary that defines a time
-	// range where faketls timestamp is acceptable.
+	// TolerateTimeSkewness is a time boundary that defines a time range where
+	// faketls timestamp is acceptable.
 	//
-	// This means that if if you got a timestamp X, now is Y, then
-	// if |X-Y| < TolerateTimeSkewness, then you accept a packet.
+	// This means that if if you got a timestamp X, now is Y, then if |X-Y| <
+	// TolerateTimeSkewness, then you accept a packet.
 	//
 	// This is an optional setting.
 	TolerateTimeSkewness time.Duration
 	// This is an optional setting.
 	PreferIP string
 
-	// DomainFrontingPort is a port we use to connect to a fronting
-	// domain.
+	// DomainFrontingPort is a port we use to connect to a fronting domain.
 	//
-	// This is required because secret does not specify a port. It
-	// specifies a hostname only.
+	// This is required because secret does not specify a port. It specifies a
+	// hostname only.
 	//
 	// This is an optional setting.
 	DomainFrontingPort uint
 
 	// AllowFallbackOnUnknownDC defines how proxy behaves if unknown DC was
-	// requested. If this setting is set to false, then such connection
-	// will be rejected. Otherwise, proxy will chose any DC.
+	// requested. If this setting is set to false, then such connection will be
+	// rejected. Otherwise, proxy will chose any DC.
 	//
-	// Telegram is designed in a way that any DC can serve any request,
-	// the problem is a latency.
+	// Telegram is designed in a way that any DC can serve any request, the
+	// problem is a latency.
 	//
 	// This is an optional setting.
 	AllowFallbackOnUnknownDC bool
 
-	// UseTestDCs defines if we have to connect to production or to staging
-	// DCs of Telegram.
+	// UseTestDCs defines if we have to connect to production or to staging DCs of
+	// Telegram.
 	//
-	// This is required if you use mtglib as an integration library for
-	// your Telegram-related projects.
+	// This is required if you use mtglib as an integration library for your
+	// Telegram-related projects.
 	//
 	// This is an optional setting.
 	UseTestDCs bool

mtglib/proxy_test.go

 
 	suite.listener = listener
 
-	go suite.p.Serve(suite.listener) // nolint: errcheck
+	go suite.p.Serve(suite.listener) //nolint: errcheck
 }
 
 func (suite *ProxyTestSuite) TearDownSuite() {
 
 	addr := fmt.Sprintf("https://%s/headers", suite.ProxyAddress())
 
-	resp, err := client.Get(addr) // nolint: noctx
+	resp, err := client.Get(addr) //nolint: noctx
 	suite.NoError(err)
 
 	defer resp.Body.Close()
 
 	jsonStruct := struct {
 		Headers struct {
-			TraceID string `json:"X-Amzn-Trace-Id"` // nolint: tagliatelle
+			TraceID string `json:"X-Amzn-Trace-Id"` //nolint: tagliatelle
 		} `json:"headers"`
 	}{}
 
 		_, err := tg.NewClient(tgClient).HelpGetConfig(ctx)
 		suite.NoError(err)
 
-		return err // nolint: wrapcheck
+		return err //nolint: wrapcheck
 	}))
 }
 

mtglib/secret.go

 // "ee367a189aee18fa31c190054efd4a8e9573746f726167652e676f6f676c65617069732e636f6d".
 // Actually, this is a serialized datastructure of 2 parts: key and host.
 //
-//     ee367a189aee18fa31c190054efd4a8e9573746f726167652e676f6f676c65617069732e636f6d
-//     |-|-------------------------------|-------------------------------------------
-//     p key                             hostname
+//	ee367a189aee18fa31c190054efd4a8e9573746f726167652e676f6f676c65617069732e636f6d
+//	|-|-------------------------------|-------------------------------------------
+//	p key                             hostname
 //
-// Serialized secret starts with 'ee'. Actually, in the past we also had
-// 'dd' secrets and prefixless ones. But this is history. Currently,
-// we do have only 'ee' secrets which mean faketls + protection from
-// statistical attacks on a length. 'ee' is a byte 238 (0xee).
+// Serialized secret starts with 'ee'. Actually, in the past we also had 'dd'
+// secrets and prefixless ones. But this is history. Currently, we do have only
+// 'ee' secrets which mean faketls + protection from statistical attacks on a
+// length. 'ee' is a byte 238 (0xee).
 //
-// After that, we have 16 bytes of the key. This is a random generated
-// secret data of the proxy and this data is used to derive
-// authentication schemas. These secrets are mixed into hmacs and sha256
-// checksums which are used to build AEAD ciphers for obfuscated2
-// protocol and ensure faketls handshake.
+// After that, we have 16 bytes of the key. This is a random generated secret
+// data of the proxy and this data is used to derive authentication schemas.
+// These secrets are mixed into hmacs and sha256 checksums which are used to
+// build AEAD ciphers for obfuscated2 protocol and ensure faketls handshake.
 //
-// Host is a domain fronting hostname in latin1 (ASCII) encoding. This
-// hostname should be used for SNI in faketls and MTG verifies it. Also,
-// this is when mtg gets about a domain fronting hostname.
+// Host is a domain fronting hostname in latin1 (ASCII) encoding. This hostname
+// should be used for SNI in faketls and MTG verifies it. Also, this is when
+// mtg gets about a domain fronting hostname.
 //
-// Secrets can be serialized into 2 forms: hex and base64. If
-// you decode both forms into bytes, you'll get the same byte array.
-// Telegram clients nowadays accept all forms.
+// Secrets can be serialized into 2 forms: hex and base64. If you decode both
+// forms into bytes, you'll get the same byte array. Telegram clients nowadays
+// accept all forms.
 type Secret struct {
 	// Key is a set of bytes used for traffic authentication.
 	Key [SecretKeyLength]byte
 		return fmt.Errorf("incorrect secret format: %w", err)
 	}
 
-	if len(decoded) < 2 { // nolint: gomnd // we need at least 1 byte here
+	if len(decoded) < 2 { //nolint: gomnd // we need at least 1 byte here
 		return fmt.Errorf("secret is truncated, length=%d", len(decoded))
 	}
 

mtglib/stream_context.go

 }
 
 func (s *streamContext) Err() error {
-	return s.ctx.Err() // nolint: wrapcheck
+	return s.ctx.Err() //nolint: wrapcheck
 }
 
 func (s *streamContext) Value(key interface{}) interface{} {
 }
 
 func (s *streamContext) ClientIP() net.IP {
-	return s.clientConn.RemoteAddr().(*net.TCPAddr).IP // nolint: forcetypeassert
+	return s.clientConn.RemoteAddr().(*net.TCPAddr).IP //nolint: forcetypeassert
 }
 
 func newStreamContext(ctx context.Context, logger Logger, clientConn essentials.Conn) *streamContext {

mtglib/stream_context_internal_test.go

 
 func (suite *StreamContextTestSuite) SetupTest() {
 	ctx, cancel := context.WithCancel(context.Background())
-	ctx = context.WithValue(ctx, "key", "value") // nolint: golint, revive, staticcheck
+	ctx = context.WithValue(ctx, "key", "value") //nolint: golint, staticcheck
 
 	suite.ctxCancel = cancel
 	suite.connMock = &testlib.EssentialsConnMock{}

network/circuit_breaker.go

 			conn.Close()
 		}
 
-		return nil, ctx.Err() // nolint: wrapcheck
+		return nil, ctx.Err() //nolint: wrapcheck
 	case c.stateMutexChan <- true:
 		defer func() {
 			<-c.stateMutexChan
 		c.switchState(circuitBreakerStateOpened)
 	}
 
-	return conn, err // nolint: wrapcheck
+	return conn, err //nolint: wrapcheck
 }
 
 func (c *circuitBreakerDialer) doHalfOpened(ctx context.Context,
 			conn.Close()
 		}
 
-		return nil, ctx.Err() // nolint: wrapcheck
+		return nil, ctx.Err() //nolint: wrapcheck
 	case c.stateMutexChan <- true:
 		defer func() {
 			<-c.stateMutexChan
 	}
 
 	if c.state != circuitBreakerStateHalfOpened {
-		return conn, err // nolint: wrapcheck
+		return conn, err //nolint: wrapcheck
 	}
 
 	if err == nil {
 		c.switchState(circuitBreakerStateOpened)
 	}
 
-	return conn, err // nolint: wrapcheck
+	return conn, err //nolint: wrapcheck
 }
 
 func (c *circuitBreakerDialer) switchState(state uint32) {

network/circuit_breaker_internal_test.go

 		Port: 80,
 	})
 
-	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") // nolint: errcheck
-	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") // nolint: errcheck
-	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") // nolint: errcheck
-	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") // nolint: errcheck
+	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") //nolint: errcheck
+	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") //nolint: errcheck
+	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") //nolint: errcheck
+	suite.d.DialContext(suite.ctx, "tcp", "127.0.0.1") //nolint: errcheck
 
 	time.Sleep(500 * time.Millisecond)
 

network/default.go

 
 func (d *defaultDialer) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	switch network {
-	case "tcp", "tcp4", "tcp6": // nolint: goconst
+	case "tcp", "tcp4", "tcp6": //nolint: goconst
 	default:
 		return nil, fmt.Errorf("unsupported network %s", network)
 	}
 		return nil, fmt.Errorf("cannot set socket options: %w", err)
 	}
 
-	return conn.(essentials.Conn), nil // nolint: forcetypeassert
+	return conn.(essentials.Conn), nil //nolint: forcetypeassert
 }
 
 // NewDefaultDialer build a new dialer which dials bypassing proxies

network/default_test.go

 func (suite *DefaultDialerTestSuite) TestHTTPRequest() {
 	httpClient := suite.MakeHTTPClient(suite.d)
 
-	resp, err := httpClient.Get(suite.MakeURL("/get")) // nolint: noctx
+	resp, err := httpClient.Get(suite.MakeURL("/get")) //nolint: noctx
 	if err == nil {
 		defer resp.Body.Close()
 	}

network/dns_resolver.go

 	return ips
 }
 
-func newDNSResolver(hostname string, httpClient *http.Client) (ret *dnsResolver) {
+func newDNSResolver(hostname string, httpClient *http.Client) *dnsResolver {
 	if net.ParseIP(hostname).To4() == nil {
 		// the hostname is an IPv6 address
 		hostname = fmt.Sprintf("[%s]", hostname)
 	}
 
-	ret = &dnsResolver{
+	return &dnsResolver{
 		resolver: doh.Resolver{
 			Host:       hostname,
 			Class:      doh.IN,
 		},
 		cache: map[string]dnsResolverCacheEntry{},
 	}
-
-	return
 }

network/init.go

 // Network contains a default implementation of the network.
 //
-// Please see mtglib.Network interface to get some basic idea behind
-// this abstraction.
+// Please see [mtglib.Network] interface to get some basic idea behind this
+// abstraction.
 //
 // Some notable feature of this implementation:
 //
-// 1. It detaches dialer from a network. Dialer is something which
-// implements a real dialer and network completes it with more higher
-// level details.
-//
-// 2. It uses only TCP connections. Even for DNS it uses DNS-Over-HTTPS
-//
-// 3. It has some simple implementation of DNS cache which is good
-// enough for our purpose.
-//
-// 4. It sets uses SO_REUSEPORT port if applicable.
+//  1. It detaches dialer from a network. Dialer is something which implements a
+//     real dialer and network completes it with more higher level details.
+//  2. It uses only TCP connections. Even for DNS it uses DNS-Over-HTTPS
+//  3. It has some simple implementation of DNS cache which is good enough for
+//     our purpose.
+//  4. It sets uses SO_REUSEPORT port if applicable.
 package network
 
 import (
 )
 
 const (
-	// DefaultTimeout is a default timeout for establishing TCP
-	// connection.
+	// DefaultTimeout is a default timeout for establishing TCP connection.
 	DefaultTimeout = 10 * time.Second
 
-	// DefaultHTTPTimeout defines a default timeout for making HTTP
-	// request.
+	// DefaultHTTPTimeout defines a default timeout for making HTTP request.
 	DefaultHTTPTimeout = 10 * time.Second
 
 	// Deprecated:
 	//
-	// DefaultBufferSize defines a TCP buffer size. Both read and write, so
-	// for real size, please multiply this number by 2.
+	// DefaultBufferSize defines a TCP buffer size. Both read and write, so for
+	// real size, please multiply this number by 2.
 	DefaultBufferSize = 16 * 1024 // 16 kib
 
-	// DefaultTCPKeepAlivePeriod defines a time period between 2
-	// consequitive probes.
+	// DefaultTCPKeepAlivePeriod defines a time period between 2 consequitive
+	// probes.
 	DefaultTCPKeepAlivePeriod = 10 * time.Second
 
-	// ProxyDialerOpenThreshold is used for load balancing SOCKS5 dialer
-	// only.
+	// ProxyDialerOpenThreshold is used for load balancing SOCKS5 dialer only.
 	//
-	// This dialer uses circuit breaker with of 3 stages: OPEN,
-	// HALF_OPEN and CLOSED. If state is CLOSED, all requests go in
-	// a normal mode. If you get more that ProxyDialerOpenThreshold
-	// errors, circuit breaker goes into OPEN mode.
+	// This dialer uses circuit breaker with of 3 stages: OPEN, HALF_OPEN and
+	// CLOSED. If state is CLOSED, all requests go in a normal mode. If you get
+	// more that ProxyDialerOpenThreshold errors, circuit breaker goes into OPEN
+	// mode.
 	//
-	// When circuit breaker is in OPEN mode, it forbids all request to
-	// a given proxy. But after ProxyDialerHalfOpenTimeout it gives a
-	// second chance and opens an access for a SINGLE request. If this
-	// request success, then circuit breaker closes, otherwise opens
-	// again.
+	// When circuit breaker is in OPEN mode, it forbids all request to a given
+	// proxy. But after ProxyDialerHalfOpenTimeout it gives a second chance and
+	// opens an access for a SINGLE request. If this request success, then circuit
+	// breaker closes, otherwise opens again.
 	//
 	// When circuit breaker is closed, it clears an error states each
 	// ProxyDialerResetFailuresTimeout.
 	ProxyDialerOpenThreshold = 5
 
-	// ProxyDialerHalfOpenTimeout defines a halfopen timeout for circuit
-	// breaker.
+	// ProxyDialerHalfOpenTimeout defines a halfopen timeout for circuit breaker.
 	ProxyDialerHalfOpenTimeout = time.Minute
 
-	// ProxyDialerResetFailuresTimeout defines a timeout for resetting a
-	// failure.
+	// ProxyDialerResetFailuresTimeout defines a timeout for resetting a failure.
 	ProxyDialerResetFailuresTimeout = 10 * time.Second
 
-	// DefaultDOHHostname defines a default IP address for DOH host.
-	// Since mtg is simple, please pass IP address here. We do not
-	// have bootstrap servers here embedded.
+	// DefaultDOHHostname defines a default IP address for DOH host. Since mtg is
+	// simple, please pass IP address here. We do not have bootstrap servers here
+	// embedded.
 	DefaultDOHHostname = "9.9.9.9"
 
 	// DNSTimeout defines a timeout for DNS queries.
 )
 
 var (
-	// ErrCircuitBreakerOpened is returned when proxy is being accessed
-	// but circuit breaker is opened.
+	// ErrCircuitBreakerOpened is returned when proxy is being accessed but
+	// circuit breaker is opened.
 	ErrCircuitBreakerOpened = errors.New("circuit breaker is opened")
 
-	// ErrCannotDialWithAllProxies is returned when load balancing
-	// client is trying to access proxies but all of them are failed.
+	// ErrCannotDialWithAllProxies is returned when load balancing client is
+	// trying to access proxies but all of them are failed.
 	ErrCannotDialWithAllProxies = errors.New("cannot dial with all proxies")
 )
 

network/init_internal_test.go

 func (d *DialerMock) Dial(network, address string) (essentials.Conn, error) {
 	args := d.Called(network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck, forcetypeassert
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
 func (d *DialerMock) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	args := d.Called(ctx, network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck, forcetypeassert
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }

network/init_test.go

 func (d *DialerMock) Dial(network, address string) (essentials.Conn, error) {
 	args := d.Called(network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck, forcetypeassert
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
 func (d *DialerMock) DialContext(ctx context.Context, network, address string) (essentials.Conn, error) {
 	args := d.Called(ctx, network, address)
 
-	return args.Get(0).(essentials.Conn), args.Error(1) // nolint: wrapcheck, forcetypeassert
+	return args.Get(0).(essentials.Conn), args.Error(1) //nolint: wrapcheck, forcetypeassert
 }
 
 type HTTPServerTestSuite struct {
 	return &http.Client{
 		Transport: &http.Transport{
 			DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
-				return dialer.DialContext(ctx, network, address) // nolint: wrapcheck
+				return dialer.DialContext(ctx, network, address) //nolint: wrapcheck
 			},
 		},
 	}
 		},
 	})
 
-	go suite.socks5Server.Serve(suite.socks5Listener) // nolint: errcheck
+	go suite.socks5Server.Serve(suite.socks5Listener) //nolint: errcheck
 }
 
 func (suite *Socks5ServerTestSuite) TearDownSuite() {

network/load_balanced_socks5.go

 	return nil, ErrCannotDialWithAllProxies
 }
 
-// NewLoadBalancedSocks5Dialer builds a new load balancing SOCKS5
-// dialer.
+// NewLoadBalancedSocks5Dialer builds a new load balancing SOCKS5 dialer.
 //
-// The main difference from one which is made by NewSocks5Dialer is that
-// we actually have a list of these proxies. When dial is requested,
-// any proxy is picked and used. If proxy fails for some reason, we try
-// another one.
+// The main difference from one which is made by NewSocks5Dialer is that we
+// actually have a list of these proxies. When dial is requested, any proxy is
+// picked and used. If proxy fails for some reason, we try another one.
 //
-// So, it is mostly useful if you have some routes with proxies which
-// are not always online or having buggy network.
+// So, it is mostly useful if you have some routes with proxies which are not
+// always online or having buggy network.
 func NewLoadBalancedSocks5Dialer(baseDialer Dialer, proxyURLs []*url.URL) (Dialer, error) {
 	dialers := make([]Dialer, 0, len(proxyURLs))
 

network/load_balanced_socks5_test.go

 }
 
 func (suite *LoadBalancedSocks5TestSuite) TestDialOk() {
-	resp, err := suite.httpClient.Get(suite.MakeURL("/get")) // nolint: noctx
+	resp, err := suite.httpClient.Get(suite.MakeURL("/get")) //nolint: noctx
 	if err == nil {
 		defer resp.Body.Close()
 	}

network/network.go

 func (n networkHTTPTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	req.Header.Set("User-Agent", n.userAgent)
 
-	return n.next.RoundTrip(req) // nolint: wrapcheck
+	return n.next.RoundTrip(req) //nolint: wrapcheck
 }
 
 type network struct {
 	return ips, nil
 }
 
-// NewNetwork assembles an mtglib.Network compatible structure
-// based on a dialer and given params.
+// NewNetwork assembles an mtglib.Network compatible structure based on a
+// dialer and given params.
 //
 // It brings simple DNS cache and DNS-Over-HTTPS when necessary.
 func NewNetwork(dialer Dialer,

network/network_test.go

 
 	client := ntw.MakeHTTPClient(nil)
 
-	resp, err := client.Get(suite.httpServer.URL + "/headers") // nolint: noctx
+	resp, err := client.Get(suite.httpServer.URL + "/headers") //nolint: noctx
 	suite.NoError(err)
 
 	defer resp.Body.Close()
 
 	jsonStruct := struct {
 		Headers struct {
-			UserAgent []string `json:"User-Agent"` // nolint: tagliatelle
+			UserAgent []string `json:"User-Agent"` //nolint: tagliatelle
 		} `json:"headers"`
 	}{}
 
 
 	client := ntw.MakeHTTPClient(nil)
 
-	resp, err := client.Get("https://httpbin.org/headers") // nolint: noctx
+	resp, err := client.Get("https://httpbin.org/headers") //nolint: noctx
 	suite.NoError(err)
 
 	defer resp.Body.Close()
 
 	jsonStruct := struct {
 		Headers struct {
-			UserAgent string `json:"User-Agent"` // nolint: tagliatelle
+			UserAgent string `json:"User-Agent"` //nolint: tagliatelle
 		} `json:"headers"`
 	}{}
 

network/proxy_dialer.go

 	)
 
 	if param := params.Get("open_threshold"); param != "" {
-		if intNum, err := strconv.ParseUint(param, 10, 32); err == nil { // nolint: gomnd
+		if intNum, err := strconv.ParseUint(param, 10, 32); err == nil { //nolint: gomnd
 			openThreshold = uint32(intNum)
 		}
 	}

network/proxy_dialer_internal_test.go

 }
 
 func (suite *ProxyDialerTestSuite) TestSetupDefaults() {
-	d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) // nolint: forcetypeassert
+	d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) //nolint: forcetypeassert
 	suite.EqualValues(ProxyDialerOpenThreshold, d.openThreshold)
 	suite.EqualValues(ProxyDialerHalfOpenTimeout, d.halfOpenTimeout)
 	suite.EqualValues(ProxyDialerResetFailuresTimeout, d.resetFailuresTimeout)
 	query.Set("half_open_timeout", "2s")
 	suite.u.RawQuery = query.Encode()
 
-	d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) // nolint: forcetypeassert
+	d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) //nolint: forcetypeassert
 	suite.EqualValues(30, d.openThreshold)
 	suite.EqualValues(2*time.Second, d.halfOpenTimeout)
 	suite.EqualValues(time.Second, d.resetFailuresTimeout)
 			query.Set("open_threshold", param)
 			suite.u.RawQuery = query.Encode()
 
-			d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) // nolint: forcetypeassert
+			d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) //nolint: forcetypeassert
 			assert.EqualValues(t, ProxyDialerOpenThreshold, d.openThreshold)
 		})
 	}
 			query.Set("half_open_timeout", param)
 			suite.u.RawQuery = query.Encode()
 
-			d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) // nolint: forcetypeassert
+			d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) //nolint: forcetypeassert
 			assert.EqualValues(t, ProxyDialerHalfOpenTimeout, d.halfOpenTimeout)
 		})
 	}
 			query.Set("reset_failures_timeout", param)
 			suite.u.RawQuery = query.Encode()
 
-			d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) // nolint: forcetypeassert
+			d := newProxyDialer(&DialerMock{}, suite.u).(*circuitBreakerDialer) //nolint: forcetypeassert
 			assert.EqualValues(t, ProxyDialerHalfOpenTimeout, d.halfOpenTimeout)
 		})
 	}

network/sockopts.go

 //
 // bufferSize setting is deprecated and ignored.
 func SetClientSocketOptions(conn net.Conn, bufferSize int) error {
-	return setCommonSocketOptions(conn.(*net.TCPConn)) // nolint: forcetypeassert
+	return setCommonSocketOptions(conn.(*net.TCPConn)) //nolint: forcetypeassert
 }
 
 // SetServerSocketOptions tunes a TCP socket that represents a connection to
 // remote server like Telegram or fronting domain (but not end user).
 func SetServerSocketOptions(conn net.Conn, bufferSize int) error {
-	return setCommonSocketOptions(conn.(*net.TCPConn)) // nolint: forcetypeassert
+	return setCommonSocketOptions(conn.(*net.TCPConn)) //nolint: forcetypeassert
 }
 
 func setCommonSocketOptions(conn *net.TCPConn) error {

network/sockopts_unix.go

 func setSocketReuseAddrPort(conn syscall.RawConn) error {
 	var err error
 
-	conn.Control(func(fd uintptr) { // nolint: errcheck
-		err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+	conn.Control(func(fd uintptr) { //nolint: errcheck
+		err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1) //nolint: nosnakecase
 		if err != nil {
 			err = fmt.Errorf("cannot set SO_REUSEADDR: %w", err)
 
 			return
 		}
 
-		err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
+		err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1) //nolint: nosnakecase
 		if err != nil {
 			err = fmt.Errorf("cannot set SO_REUSEPORT: %w", err)
 		}

network/socks5.go

 	return nil
 }
 
-// NewSocks5Dialer build a new dialer from a given one (so, in theory
-// you can chain here). Proxy parameters are passed with URI in a form of:
+// NewSocks5Dialer build a new dialer from a given one (so, in theory you can
+// chain here). Proxy parameters are passed with URI in a form of:
 //
-//     socks5://[user:[password]]@host:port
+//	socks5://[user:[password]]@host:port
 func NewSocks5Dialer(baseDialer Dialer, proxyURL *url.URL) (Dialer, error) {
 	if _, _, err := net.SplitHostPort(proxyURL.Host); err != nil {
 		return nil, fmt.Errorf("incorrect url %s", proxyURL.Redacted())

network/socks5_test.go

 	dialer, _ := network.NewSocks5Dialer(suite.d, proxyURL)
 	httpClient := suite.MakeHTTPClient(dialer)
 
-	resp, err := httpClient.Get(suite.MakeURL("/get")) // nolint: noctx
+	resp, err := httpClient.Get(suite.MakeURL("/get")) //nolint: noctx
 	if err == nil {
 		defer resp.Body.Close()
 	}
 	dialer, _ := network.NewSocks5Dialer(suite.d, proxyURL)
 	httpClient := suite.MakeHTTPClient(dialer)
 
-	resp, err := httpClient.Get(suite.MakeURL("/get")) // nolint: noctx
+	resp, err := httpClient.Get(suite.MakeURL("/get")) //nolint: noctx
 	if err == nil {
 		defer resp.Body.Close()
 	}

stats/init.go

-// Stats package has implementations of events.Observers for different
+// Stats package has implementations of [events.Observer] for different
 // monitoring systems.
 //
 // Observer is a consumer of events produced by mtg. Consumers, defined

stats/pools.go

 }
 
 func acquireStreamInfo() *streamInfo {
-	return streamInfoPool.Get().(*streamInfo) // nolint: forcetypeassert
+	return streamInfoPool.Get().(*streamInfo) //nolint: forcetypeassert
 }
 
 func releaseStreamInfo(info *streamInfo) {

stats/prometheus.go

 	}
 }
 
-// PrometheusFactory is a factory of events.Observers which collect
+// PrometheusFactory is a factory of [events.Observer] which collect
 // information in a format suitable for Prometheus.
 //
-// This factory can also serve on a given listener. In that case it
-// starts HTTP server with a single endpoint - a Prometheus-compatible
-// scrape output.
+// This factory can also serve on a given listener. In that case it starts HTTP
+// server with a single endpoint - a Prometheus-compatible scrape output.
 type PrometheusFactory struct {
 	httpServer *http.Server
 
 
 // Serve starts an HTTP server on a given listener.
 func (p *PrometheusFactory) Serve(listener net.Listener) error {
-	return p.httpServer.Serve(listener) // nolint: wrapcheck
+	return p.httpServer.Serve(listener) //nolint: wrapcheck
 }
 
 // Close stops a factory. Please pay attention that underlying listener
 // is not closed.
 func (p *PrometheusFactory) Close() error {
-	return p.httpServer.Shutdown(context.Background()) // nolint: wrapcheck
+	return p.httpServer.Shutdown(context.Background()) //nolint: wrapcheck
 }
 
 // NewPrometheus builds an events.ObserverFactory which can serve HTTP
 // endpoint with Prometheus scrape data.
-func NewPrometheus(metricPrefix, httpPath string) *PrometheusFactory { // nolint: funlen
+func NewPrometheus(metricPrefix, httpPath string) *PrometheusFactory { //nolint: funlen
 	registry := prometheus.NewPedanticRegistry()
 	httpHandler := promhttp.HandlerFor(registry, promhttp.HandlerOpts{
 		EnableOpenMetrics: true,

stats/prometheus_test.go

 func (suite *PrometheusTestSuite) Get() (string, error) {
 	addr := fmt.Sprintf("http://%s/", suite.httpListener.Addr().String())
 
-	resp, err := http.Get(addr) // nolint: noctx
+	resp, err := http.Get(addr) //nolint: noctx
 	if err != nil {
-		return "", err // nolint: wrapcheck
+		return "", err //nolint: wrapcheck
 	}
 
 	defer resp.Body.Close()
 
 	data, err := io.ReadAll(resp.Body)
 	if err != nil {
-		return "", err // nolint: wrapcheck
+		return "", err //nolint: wrapcheck
 	}
 
 	return string(data), nil
 	suite.factory = stats.NewPrometheus("mtg", "/")
 	suite.prometheus = suite.factory.Make()
 
-	go suite.factory.Serve(suite.httpListener) // nolint: errcheck
+	go suite.factory.Serve(suite.httpListener) //nolint: errcheck
 }
 
 func (suite *PrometheusTestSuite) TearDownTest() {

stats/statsd.go

 	}
 }
 
-// StatsdFactory is a factory of events.Observers which dumps
-// information to statsd.
+// StatsdFactory is a factory of [events.Observer] which dumps information to
+// statsd.
 //
-// Please beware that we support ONLY UDP endpoints there. And this
-// factory won't use mtglib.Network so it won't use a proxy if you
-// provide any. If you need it, I would recommend starting a local
-// statsd and route metrics further by features of the chosen server.
+// Please beware that we support ONLY UDP endpoints there. And this factory
+// won't use [mtglib.Network] so it won't use a proxy if you provide any. If
+// you need it, I would recommend starting a local statsd and route metrics
+// further by features of the chosen server.
 type StatsdFactory struct {
 	client *statsd.Client
 }
 
 // Close stops sending requests to statsd.
 func (s StatsdFactory) Close() error {
-	return s.client.Close() // nolint: wrapcheck
+	return s.client.Close() //nolint: wrapcheck
 }
 
 // Make build a new observer.
 	}
 }
 
-// NewStatsd builds an events.ObserverFactory that sends events
-// to statsd.
+// NewStatsd builds an [events.ObserverFactory] that sends events to statsd.
 //
 // Valid tagFormats are 'datadog', 'influxdb' and 'graphite'.
 func NewStatsd(address string, log logger.StdLikeLogger,

stats/statsd_test.go

 
 func (s *statsdFakeServer) Close() error {
 	if s.conn != nil {
-		return s.conn.Close() // nolint: wrapcheck
+		return s.conn.Close() //nolint: wrapcheck
 	}
 
 	return nil