Switch to golangci-lint

.golangci.toml

+[run]
+concurrency = 4
+deadline = "2m"
+tests = true
+skip-dirs = ["vendor"]
+skip-files = ["version.go"]
+
+[output]
+format = "colored-line-number"
+
+[linters]
+enable-all = true

.gometalinter.json

-{
-    "aggregate": true,
-    "vendor": true
-}

.travis.yml

   - master
 
 script:
+  - make prepare
+  - make all
   - make lint
   - make test
 

Gopkg.lock

 
 [[projects]]
   branch = "master"
+  digest = "1:45a787c1adea69a03a5384865b307c7a72bb28bd5844bd57679d889a726a588b"
   name = "github.com/alecthomas/template"
   packages = [
     ".",
-    "parse"
+    "parse",
   ]
+  pruneopts = "UT"
   revision = "a0175ee3bccc567396460bf5acd36800cb10c49c"
 
 [[projects]]
   branch = "master"
+  digest = "1:c198fdc381e898e8fb62b8eb62758195091c313ad18e52a3067366e1dda2fb3c"
   name = "github.com/alecthomas/units"
   packages = ["."]
+  pruneopts = "UT"
   revision = "2efee857e7cfd4f3d0138cc3cbb1b4966962b93a"
 
 [[projects]]
+  digest = "1:a8d622a8049a4aa420e1c509873bb85d4c45c5107f420d922f919bfcb8d08694"
   name = "github.com/beevik/ntp"
   packages = ["."]
+  pruneopts = "UT"
   revision = "62c80a04de2086884d8296004b6d74ee1846c582"
   version = "v0.2.0"
 
 [[projects]]
+  digest = "1:a2c1d0e43bd3baaa071d1b9ed72c27d78169b2b269f71c105ac4ba34b1be4a39"
   name = "github.com/davecgh/go-spew"
   packages = ["spew"]
+  pruneopts = "UT"
   revision = "346938d642f2ec3594ed81d874461961cd0faa76"
   version = "v1.1.0"
 
 [[projects]]
   branch = "master"
+  digest = "1:6f9339c912bbdda81302633ad7e99a28dfa5a639c864061f1929510a9a64aa74"
   name = "github.com/dustin/go-humanize"
   packages = ["."]
+  pruneopts = "UT"
   revision = "9f541cc9db5d55bce703bd99987c9d5cb8eea45e"
 
 [[projects]]
   branch = "master"
+  digest = "1:70107cf7ee5eb9e3c3dabe65bcb220bff22ee42e32d9b7fca988e16b8727cacc"
   name = "github.com/juju/errors"
   packages = ["."]
+  pruneopts = "UT"
   revision = "c7d06af17c68cd34c835053720b21f6549d9b0ee"
 
 [[projects]]
+  digest = "1:0028cb19b2e4c3112225cd871870f2d9cf49b9b4276531f03438a88e94be86fe"
   name = "github.com/pmezard/go-difflib"
   packages = ["difflib"]
+  pruneopts = "UT"
   revision = "792786c7400a136282c1664665ae0a8db921c6c2"
   version = "v1.0.0"
 
 [[projects]]
+  digest = "1:274f67cb6fed9588ea2521ecdac05a6d62a8c51c074c1fccc6a49a40ba80e925"
   name = "github.com/satori/go.uuid"
   packages = ["."]
+  pruneopts = "UT"
   revision = "f58768cc1a7a7e77a3bd49e98cdd21419399b6a3"
   version = "v1.2.0"
 
 [[projects]]
+  digest = "1:18752d0b95816a1b777505a97f71c7467a8445b8ffb55631a7bf779f6ba4fa83"
   name = "github.com/stretchr/testify"
   packages = ["assert"]
+  pruneopts = "UT"
   revision = "f35b8ab0b5a2cef36673838d662e249dd9c94686"
   version = "v1.2.2"
 
 [[projects]]
+  digest = "1:3c1a69cdae3501bf75e76d0d86dc6f2b0a7421bc205c0cb7b96b19eed464a34d"
   name = "go.uber.org/atomic"
   packages = ["."]
+  pruneopts = "UT"
   revision = "1ea20fb1cbb1cc08cbd0d913a96dead89aa18289"
   version = "v1.3.2"
 
 [[projects]]
+  digest = "1:60bf2a5e347af463c42ed31a493d817f8a72f102543060ed992754e689805d1a"
   name = "go.uber.org/multierr"
   packages = ["."]
+  pruneopts = "UT"
   revision = "3c4937480c32f4c13a875a1829af76c98ca3d40a"
   version = "v1.1.0"
 
 [[projects]]
+  digest = "1:e6d865f90ef1178c14bdb49ea9f244bfcb28c06ea9773dc077492032632de0b8"
   name = "go.uber.org/zap"
   packages = [
     ".",
     "internal/bufferpool",
     "internal/color",
     "internal/exit",
-    "zapcore"
+    "zapcore",
   ]
+  pruneopts = "UT"
   revision = "eeedf312bc6c57391d84767a4cd413f02a917974"
   version = "v1.8.0"
 
 [[projects]]
   branch = "master"
+  digest = "1:656046288ed20c53157025a0915f176cad9340ac515501c427806a6f76023d75"
   name = "golang.org/x/net"
   packages = [
     "bpf",
     "internal/iana",
     "internal/socket",
-    "ipv4"
+    "ipv4",
   ]
+  pruneopts = "UT"
   revision = "d0887baf81f4598189d4e12a37c6da86f0bba4d0"
 
 [[projects]]
+  digest = "1:c06d9e11d955af78ac3bbb26bd02e01d2f61f689e1a3bce2ef6fb683ef8a7f2d"
   name = "gopkg.in/alecthomas/kingpin.v2"
   packages = ["."]
+  pruneopts = "UT"
   revision = "947dcec5ba9c011838740e680966fd7087a71d0d"
   version = "v2.2.6"
 
 [[projects]]
+  digest = "1:38b469493eb173db9c03321d64adcad4c7991ea0a19b5edc5bdc094f0e8c7384"
   name = "gopkg.in/alexcesaro/statsd.v2"
   packages = ["."]
+  pruneopts = "UT"
   revision = "7fea3f0d2fab1ad973e641e51dba45443a311a90"
   version = "v2.0.0"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "7fad0f62feb7737b064d85cc4333a1a3e9298faec2afd864b4404f515fc7f17c"
+  input-imports = [
+    "github.com/beevik/ntp",
+    "github.com/dustin/go-humanize",
+    "github.com/juju/errors",
+    "github.com/satori/go.uuid",
+    "github.com/stretchr/testify/assert",
+    "go.uber.org/zap",
+    "go.uber.org/zap/zapcore",
+    "gopkg.in/alecthomas/kingpin.v2",
+    "gopkg.in/alexcesaro/statsd.v2",
+  ]
   solver-name = "gps-cdcl"
   solver-version = 1

Makefile

 ROOT_DIR     := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
 IMAGE_NAME   := mtg
 APP_NAME     := $(IMAGE_NAME)
-GOMETALINTER := gometalinter
 
 VENDOR_FILES := $(shell find "$(ROOT_DIR)/vendor" 2>/dev/null || echo -n "vendor")
 CC_BINARIES  := $(shell bash -c "echo -n $(APP_NAME)-{linux,freebsd,openbsd}-{386,amd64} $(APP_NAME)-linux-{arm,arm64}")
 APP_DEPS     := version.go $(VENDOR_FILES)
 
+GOLANGCI_LINT_VERSION := v1.9.1
+
 COMMON_BUILD_FLAGS := -ldflags="-s -w"
 
 # -----------------------------------------------------------------------------
 version.go:
 	@go generate main.go
 
-vendor: Gopkg.lock Gopkg.toml install-cli
+vendor: Gopkg.lock Gopkg.toml install-dep
 	@dep ensure
 
 # -----------------------------------------------------------------------------
 	@rm -rf "$(CC_DIR)" && mkdir -p "$(CC_DIR)"
 
 .PHONY: test
-test: vendor install-cli version.go
+test: vendor version.go
 	@go test -v ./...
 
 .PHONY: lint
-lint: vendor install-cli version.go
-	@$(GOMETALINTER) --deadline=2m ./...
+lint: version.go
+	@golangci-lint run
 
 .PHONY: clean
 clean:
 docker:
 	@docker build --pull -t "$(IMAGE_NAME)" "$(ROOT_DIR)"
 
-.PHONY: install-cli
-install-cli: install-dep install-lint
+.PHONY: prepare
+prepare: install-dep install-lint
 
 .PHONY: install-dep
 install-dep:
-	@go get github.com/golang/dep/cmd/dep
+	@go get -u github.com/golang/dep/cmd/dep
 
 .PHONY: install-lint
 install-lint:
-	@go get github.com/alecthomas/gometalinter && \
-		$(GOMETALINTER) --install >/dev/null
+	@curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh \
+		| bash -s -- -b $(GOPATH)/bin $(GOLANGCI_LINT_VERSION)

main.go

 var (
 	app = kingpin.New("mtg", "Simple MTPROTO proxy.")
 
-	debug = app.Flag("debug", "Run in debug mode.").
+	debug = app.Flag("debug",
+		"Run in debug mode.").
 		Short('d').
 		Envar("MTG_DEBUG").
 		Bool()
-	verbose = app.Flag("verbose", "Run in verbose mode.").
+	verbose = app.Flag("verbose",
+		"Run in verbose mode.").
 		Short('v').
 		Envar("MTG_VERBOSE").
 		Bool()
 
-	bindIP = app.Flag("bind-ip", "Which IP to bind to.").
+	bindIP = app.Flag("bind-ip",
+		"Which IP to bind to.").
 		Short('b').
 		Envar("MTG_IP").
 		Default("127.0.0.1").
 		IP()
-	bindPort = app.Flag("bind-port", "Which port to bind to.").
-			Short('p').
-			Envar("MTG_PORT").
-			Default("3128").
-			Uint16()
-
-	publicIPv4 = app.Flag("public-ipv4", "Which IPv4 address is public.").
-			Short('4').
-			Envar("MTG_IPV4").
-			IP()
-	publicIPv4Port = app.Flag("public-ipv4-port", "Which IPv4 port is public. Default is 'bind-port' value.").
-			Envar("MTG_IPV4_PORT").
-			Uint16()
-
-	publicIPv6 = app.Flag("public-ipv6", "Which IPv6 address is public.").
-			Short('6').
-			Envar("MTG_IPV6").
-			IP()
-	publicIPv6Port = app.Flag("public-ipv6-port", "Which IPv6 port is public. Default is 'bind-port' value.").
-			Envar("MTG_IPV6_PORT").
-			Uint16()
-
-	statsIP = app.Flag("stats-ip", "Which IP bind stats server to.").
+	bindPort = app.Flag("bind-port",
+		"Which port to bind to.").
+		Short('p').
+		Envar("MTG_PORT").
+		Default("3128").
+		Uint16()
+
+	publicIPv4 = app.Flag("public-ipv4",
+		"Which IPv4 address is public.").
+		Short('4').
+		Envar("MTG_IPV4").
+		IP()
+	publicIPv4Port = app.Flag("public-ipv4-port",
+		"Which IPv4 port is public. Default is 'bind-port' value.").
+		Envar("MTG_IPV4_PORT").
+		Uint16()
+
+	publicIPv6 = app.Flag("public-ipv6",
+		"Which IPv6 address is public.").
+		Short('6').
+		Envar("MTG_IPV6").
+		IP()
+	publicIPv6Port = app.Flag("public-ipv6-port",
+		"Which IPv6 port is public. Default is 'bind-port' value.").
+		Envar("MTG_IPV6_PORT").
+		Uint16()
+
+	statsIP = app.Flag("stats-ip",
+		"Which IP bind stats server to.").
 		Short('t').
 		Envar("MTG_STATS_IP").
 		Default("127.0.0.1").
 		IP()
-	statsPort = app.Flag("stats-port", "Which port bind stats to.").
-			Short('q').
-			Envar("MTG_STATS_PORT").
-			Default("3129").
-			Uint16()
-
-	statsdIP = app.Flag("statsd-ip", "Which IP should we use for working with statsd.").
-			Envar("MTG_STATSD_IP").
-			String()
-	statsdPort = app.Flag("statsd-port", "Which port should we use for working with statsd.").
-			Envar("MTG_STATSD_PORT").
-			Default("8125").
-			Uint16()
-	statsdNetwork = app.Flag("statsd-network", "Which network is used to work with statsd. Only 'tcp' and 'udp' are supported.").
-			Envar("MTG_STATSD_NETWORK").
-			Default("udp").
-			String()
-	statsdPrefix = app.Flag("statsd-prefix", "Which bucket prefix should we use for sending stats to statsd.").
-			Envar("MTG_STATSD_PREFIX").
-			Default("mtg").
-			String()
-	statsdTagsFormat = app.Flag("statsd-tags-format", "Which tag format should we use to send stats metrics. Valid options are 'datadog' and 'influxdb'.").
-				Envar("MTG_STATSD_TAGS_FORMAT").
-				String()
-	statsdTags = app.Flag("statsd-tags", "Tags to use for working with statsd (specified as 'key=value').").
-			Envar("MTG_STATSD_TAGS").
-			StringMap()
+	statsPort = app.Flag("stats-port",
+		"Which port bind stats to.").
+		Short('q').
+		Envar("MTG_STATS_PORT").
+		Default("3129").
+		Uint16()
+
+	statsdIP = app.Flag("statsd-ip",
+		"Which IP should we use for working with statsd.").
+		Envar("MTG_STATSD_IP").
+		String()
+	statsdPort = app.Flag("statsd-port",
+		"Which port should we use for working with statsd.").
+		Envar("MTG_STATSD_PORT").
+		Default("8125").
+		Uint16()
+	statsdNetwork = app.Flag("statsd-network",
+		"Which network is used to work with statsd. Only 'tcp' and 'udp' are supported.").
+		Envar("MTG_STATSD_NETWORK").
+		Default("udp").
+		String()
+	statsdPrefix = app.Flag("statsd-prefix",
+		"Which bucket prefix should we use for sending stats to statsd.").
+		Envar("MTG_STATSD_PREFIX").
+		Default("mtg").
+		String()
+	statsdTagsFormat = app.Flag("statsd-tags-format",
+		"Which tag format should we use to send stats metrics. Valid options are 'datadog' and 'influxdb'.").
+		Envar("MTG_STATSD_TAGS_FORMAT").
+		String()
+	statsdTags = app.Flag("statsd-tags",
+		"Tags to use for working with statsd (specified as 'key=value').").
+		Envar("MTG_STATSD_TAGS").
+		StringMap()
 
 	secret = app.Arg("secret", "Secret of this proxy.").Required().String()
 	adtag  = app.Arg("adtag", "ADTag of the proxy.").String()
 			zap.S().Warnw("Could not fetch time data from NTP")
 		} else {
 			if diff >= time.Second {
-				usage(fmt.Sprintf("You choose to use middle proxy but your clock drift (%s) is bigger than 1 second. Please, sync your time", diff))
+				usage(fmt.Sprintf("You choose to use middle proxy but your clock drift (%s) "+
+					"is bigger than 1 second. Please, sync your time", diff))
 			}
 			go ntp.AutoUpdate()
 		}

mtproto/rpc/proxy_flags.go

 
 const (
 	proxyRequestFlagsHasAdTag     proxyRequestFlags = 0x8
-	proxyRequestFlagsEncrypted                      = 0x2
-	proxyRequestFlagsMagic                          = 0x1000
-	proxyRequestFlagsExtMode2                       = 0x20000
-	proxyRequestFlagsIntermediate                   = 0x20000000
-	proxyRequestFlagsAbdridged                      = 0x40000000
-	proxyRequestFlagsQuickAck                       = 0x80000000
-	proxyRequestFlagsPad                            = 0x8000000
+	proxyRequestFlagsEncrypted    proxyRequestFlags = 0x2
+	proxyRequestFlagsMagic        proxyRequestFlags = 0x1000
+	proxyRequestFlagsExtMode2     proxyRequestFlags = 0x20000
+	proxyRequestFlagsIntermediate proxyRequestFlags = 0x20000000
+	proxyRequestFlagsAbdridged    proxyRequestFlags = 0x40000000
+	proxyRequestFlagsQuickAck     proxyRequestFlags = 0x80000000
+	proxyRequestFlagsPad          proxyRequestFlags = 0x8000000
 )
 
 var proxyRequestFlagsEncryptedPrefix [8]byte

mtproto/rpc/proxy_request.go

 }
 
 // NewProxyRequest build new ProxyRequest data structure.
-func NewProxyRequest(clientAddr, ownAddr *net.TCPAddr, opts *mtproto.ConnectionOpts, adTag []byte) (*ProxyRequest, error) {
+func NewProxyRequest(clientAddr, ownAddr *net.TCPAddr,
+	opts *mtproto.ConnectionOpts, adTag []byte) (*ProxyRequest, error) {
 	flags := proxyRequestFlagsHasAdTag | proxyRequestFlagsMagic | proxyRequestFlagsExtMode2
 
 	switch opts.ConnectionType {

obfuscated2/obfuscated2_test.go

 
 	clientFrame := generateFrame(mtproto.ConnectionTypeIntermediate)
 	clientHasher := sha256.New()
-	clientHasher.Write(clientFrame.Key())
-	clientHasher.Write(secret)
+	clientHasher.Write(clientFrame.Key()) // nolint: errcheck
+	clientHasher.Write(secret)            // nolint: errcheck
 	clientKey := clientHasher.Sum(nil)
 
 	encryptor := makeStreamCipher(clientKey, clientFrame.IV())
 
 	invertedClientFrame := clientFrame.Invert()
 	clientHasher = sha256.New()
-	clientHasher.Write(invertedClientFrame.Key())
-	clientHasher.Write(secret)
+	clientHasher.Write(invertedClientFrame.Key()) // nolint: errcheck
+	clientHasher.Write(secret)                    // nolint: errcheck
 	invertedClientKey := clientHasher.Sum(nil)
 	clientDecryptor := makeStreamCipher(invertedClientKey, invertedClientFrame.IV())
 

proxy/proxy.go

 	return packetConn, nil
 }
 
-func (p *Proxy) middlePipe(src wrappers.PacketReadCloser, dst io.WriteCloser, wait *sync.WaitGroup, hacks *mtproto.Hacks) {
+func (p *Proxy) middlePipe(src wrappers.PacketReadCloser, dst io.WriteCloser,
+	wait *sync.WaitGroup, hacks *mtproto.Hacks) {
 	defer func() {
 		src.Close() // nolint: errcheck
 		dst.Close() // nolint: errcheck

stats/server.go

 
 var instance *stats
 
-// Start starts new statisitcs server.
+// Start starts new statistics server.
 func Start(conf *config.Config) error {
 	log := zap.S().Named("stats")
 

telegram/direct.go

 
 var (
 	directV4Addresses = map[int16][]string{
-		0: []string{"149.154.175.50:443"},
-		1: []string{"149.154.167.51:443"},
-		2: []string{"149.154.175.100:443"},
-		3: []string{"149.154.167.91:443"},
-		4: []string{"149.154.171.5:443"},
+		0: {"149.154.175.50:443"},
+		1: {"149.154.167.51:443"},
+		2: {"149.154.175.100:443"},
+		3: {"149.154.167.91:443"},
+		4: {"149.154.171.5:443"},
 	}
 	directV6Addresses = map[int16][]string{
-		0: []string{"[2001:b28:f23d:f001::a]:443"},
-		1: []string{"[2001:67c:04e8:f002::a]:443"},
-		2: []string{"[2001:b28:f23d:f003::a]:443"},
-		3: []string{"[2001:67c:04e8:f004::a]:443"},
-		4: []string{"[2001:b28:f23f:f005::a]:443"},
+		0: {"[2001:b28:f23d:f001::a]:443"},
+		1: {"[2001:67c:04e8:f002::a]:443"},
+		2: {"[2001:b28:f23d:f003::a]:443"},
+		3: {"[2001:67c:04e8:f004::a]:443"},
+		4: {"[2001:b28:f23f:f005::a]:443"},
 	}
 )
 
 	return t.baseTelegram.dial(dc-1, connID, connOpts.ConnectionProto)
 }
 
-func (t *directTelegram) Init(connOpts *mtproto.ConnectionOpts, conn wrappers.StreamReadWriteCloser) (wrappers.Wrap, error) {
+func (t *directTelegram) Init(connOpts *mtproto.ConnectionOpts,
+	conn wrappers.StreamReadWriteCloser) (wrappers.Wrap, error) {
 	obfs2, frame := obfuscated2.MakeTelegramObfuscated2Frame(connOpts)
 
 	if _, err := conn.Write(frame); err != nil {
 // NewDirectTelegram returns Telegram instance which connects directly
 // to Telegram bypassing middleproxies.
 func NewDirectTelegram(conf *config.Config) Telegram {
-	return &directTelegram{baseTelegram{
-		dialer: tgDialer{
-			Dialer: net.Dialer{Timeout: telegramDialTimeout},
-			conf:   conf,
+	return &directTelegram{
+		baseTelegram: baseTelegram{
+			dialer: tgDialer{
+				Dialer: net.Dialer{Timeout: telegramDialTimeout},
+				conf:   conf,
+			},
+			v4Addresses: directV4Addresses,
+			v6Addresses: directV6Addresses,
 		},
-		v4Addresses: directV4Addresses,
-		v6Addresses: directV6Addresses,
-	}}
+	}
 }

telegram/middle.go

 	conf *config.Config
 }
 
-func (t *middleTelegram) Init(connOpts *mtproto.ConnectionOpts, conn wrappers.StreamReadWriteCloser) (wrappers.Wrap, error) {
+func (t *middleTelegram) Init(connOpts *mtproto.ConnectionOpts,
+	conn wrappers.StreamReadWriteCloser) (wrappers.Wrap, error) {
 	rpcNonceConn := wrappers.NewMTProtoFrame(conn, rpc.SeqNoNonce)
 
 	rpcNonceReq, err := t.sendRPCNonceRequest(rpcNonceConn)
 	return rpcNonceReq, nil
 }
 
-func (t *middleTelegram) receiveRPCNonceResponse(conn wrappers.PacketReader, req *rpc.NonceRequest) (*rpc.NonceResponse, error) {
+func (t *middleTelegram) receiveRPCNonceResponse(conn wrappers.PacketReader,
+	req *rpc.NonceRequest) (*rpc.NonceResponse, error) {
 	packet, err := conn.Read()
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot read RPC nonce response")
 	return req, nil
 }
 
-func (t *middleTelegram) receiveRPCHandshakeResponse(conn wrappers.PacketReader, req *rpc.HandshakeRequest) (*rpc.HandshakeResponse, error) {
+func (t *middleTelegram) receiveRPCHandshakeResponse(conn wrappers.PacketReader,
+	req *rpc.HandshakeRequest) (*rpc.HandshakeResponse, error) {
 	packet, err := conn.Read()
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot read RPC handshake response")

telegram/middle_caller.go

 	httpClient  *http.Client
 }
 
-func (t *middleTelegramCaller) Dial(connID string, connOpts *mtproto.ConnectionOpts) (wrappers.StreamReadWriteCloser, error) {
+func (t *middleTelegramCaller) Dial(connID string,
+	connOpts *mtproto.ConnectionOpts) (wrappers.StreamReadWriteCloser, error) {
 	dc := connOpts.DC
 	if dc == 0 {
 		dc = 1

telegram/telegram.go

 	v6Addresses map[int16][]string
 }
 
-func (b *baseTelegram) dial(dcIdx int16, connID string, proto mtproto.ConnectionProtocol) (wrappers.StreamReadWriteCloser, error) {
+func (b *baseTelegram) dial(dcIdx int16, connID string,
+	proto mtproto.ConnectionProtocol) (wrappers.StreamReadWriteCloser, error) {
 	addrs := make([]string, 2)
 
 	if proto&mtproto.ConnectionProtocolIPv6 != 0 {

wrappers/conn.go

 	"github.com/9seconds/mtg/stats"
 )
 
-// ConnPurpose is intented to be identifier of connection purpose. We
+// ConnPurpose is intended to be identifier of connection purpose. We
 // sometimes want to treat client/telegram connection differently (for
 // logging for example).
 type ConnPurpose uint8

wrappers/mtproto_cipher.go

 
 // NewMiddleProxyCipher creates new block cipher to proxy<->telegram
 // connection.
-func NewMiddleProxyCipher(conn StreamReadWriteCloser, req *rpc.NonceRequest, resp *rpc.NonceResponse, secret []byte) StreamReadWriteCloser {
+func NewMiddleProxyCipher(conn StreamReadWriteCloser,
+	req *rpc.NonceRequest, resp *rpc.NonceResponse, secret []byte) StreamReadWriteCloser {
 	localAddr := conn.LocalAddr()
 	remoteAddr := conn.RemoteAddr()
 
 	return NewBlockCipher(conn, enc, dec)
 }
 
-func deriveKeys(purpose cipherPurpose, req *rpc.NonceRequest, resp *rpc.NonceResponse, client *net.TCPAddr, remote *net.TCPAddr, secret []byte) ([]byte, []byte) {
+func deriveKeys(purpose cipherPurpose, req *rpc.NonceRequest, resp *rpc.NonceResponse,
+	client, remote *net.TCPAddr, secret []byte) ([]byte, []byte) {
 	message := bytes.Buffer{}
 	message.Write(resp.Nonce[:])
 	message.Write(req.Nonce[:])

wrappers/mtproto_frame.go

 		"messageLength", messageLength,
 		"sequence_number", m.readSeqNo,
 	)
-	if messageLength%4 != 0 || messageLength < mtprotoFrameMinMessageLength || messageLength > mtprotoFrameMaxMessageLength {
+	if messageLength%4 != 0 || messageLength < mtprotoFrameMinMessageLength ||
+		messageLength > mtprotoFrameMaxMessageLength {
 		return nil, errors.Errorf("Incorrect frame message length %d", messageLength)
 	}
 

wrappers/mtproto_proxy.go

 	case bytes.Equal(tag, rpc.TagSimpleAck):
 		return m.readSimpleAck(packet)
 	case bytes.Equal(tag, rpc.TagCloseExt):
-		return m.readCloseExt(packet)
+		return m.readCloseExt()
 	}
 
 	return nil, errors.Errorf("Unknown RPC answer %v", tag)
 	return data, nil
 }
 
-func (m *MTProtoProxy) readCloseExt(data []byte) ([]byte, error) {
+func (m *MTProtoProxy) readCloseExt() ([]byte, error) {
 	m.logger.Debugw("Read RPC_CLOSE_EXT", "counter", m.readCounter)
 
 	return nil, errors.New("Connection has been closed remotely by RPC call")
 }
 
 // NewMTProtoProxy creates new RPC wrapper.
-func NewMTProtoProxy(conn PacketReadWriteCloser, connOpts *mtproto.ConnectionOpts, adTag []byte) (PacketReadWriteCloser, error) {
+func NewMTProtoProxy(conn PacketReadWriteCloser, connOpts *mtproto.ConnectionOpts,
+	adTag []byte) (PacketReadWriteCloser, error) {
 	req, err := rpc.NewProxyRequest(connOpts.ClientAddr, conn.LocalAddr(), connOpts, adTag)
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot create new RPC proxy request")