Move rlimit to utils

go.mod

 	go.uber.org/multierr v1.1.0 // indirect
 	go.uber.org/zap v1.10.0
 	golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 // indirect
-	golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a // indirect
+	golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 	gopkg.in/alexcesaro/statsd.v2 v2.0.0
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect

main.go

 import (
 	"math/rand"
 	"os"
-	"syscall"
 	"time"
 
-	"github.com/juju/errors"
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
 
 	"github.com/9seconds/mtg/cli"
 	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/utils"
 )
 
 var version = "dev" // this has to be set by build ld flags
 	app.Version(version)
 	app.HelpFlag.Short('h')
 
-	if err := setRLimit(); err != nil {
+	if err := utils.SetLimits(); err != nil {
 		cli.Fatal(err.Error())
 	}
 
 		}
 	}
 }
-
-func setRLimit() (err error) {
-	rLimit := syscall.Rlimit{}
-	err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
-	if err != nil {
-		err = errors.Annotate(err, "Cannot get rlimit")
-		return
-	}
-	rLimit.Cur = rLimit.Max
-
-	err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
-	if err != nil {
-		err = errors.Annotate(err, "Cannot set rlimit")
-	}
-
-	return
-}

utils/rlimit.go

+// +build !windows
+
+package utils
+
+import (
+	"golang.org/x/sys/unix"
+
+	"github.com/juju/errors"
+)
+
+func SetLimits() (err error) {
+	rLimit := unix.Rlimit{}
+	err = unix.Getrlimit(unix.RLIMIT_NOFILE, &rLimit)
+	if err != nil {
+		err = errors.Annotate(err, "Cannot get rlimit")
+		return
+	}
+	rLimit.Cur = rLimit.Max
+
+	err = unix.Setrlimit(unix.RLIMIT_NOFILE, &rLimit)
+	if err != nil {
+		err = errors.Annotate(err, "Cannot set rlimit")
+	}
+
+	return
+}

utils/rlimit_windows.go

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