replace packages for pid file writing and reading (TykTechnologies#2892)

fixes  https://github.com/TykTechnologies/tyk-analytics/issues/1752

gateway/server.go

@@ -38,7 +38,6 @@ import (
 	"github.com/TykTechnologies/tyk/user"
 	logstashHook "github.com/bshuster-repo/logrus-logstash-hook"
 	"github.com/evalphobia/logrus_sentry"
-	"github.com/facebookgo/pidfile"
 	graylogHook "github.com/gemnasium/logrus-graylog-hook"
 	"github.com/gorilla/mux"
 	"github.com/justinas/alice"
@@ -943,8 +942,7 @@ func initialiseSystem(ctx context.Context) error {
 
 	mainLog.Info("PIDFile location set to: ", config.Global().PIDFileLocation)
 
-	pidfile.SetPidfilePath(config.Global().PIDFileLocation)
-	if err := pidfile.Write(); err != nil {
+	if err := writePIDFile(); err != nil {
 		mainLog.Error("Failed to write PIDFile: ", err)
 	}
 
@@ -965,6 +963,23 @@ func initialiseSystem(ctx context.Context) error {
 	return nil
 }
 
+func writePIDFile() error {
+	file := config.Global().PIDFileLocation
+	if err := os.MkdirAll(filepath.Dir(file), 0755); err != nil {
+		return err
+	}
+	pid := strconv.Itoa(os.Getpid())
+	return ioutil.WriteFile(file, []byte(pid), 0600)
+}
+
+func readPIDFromFile() (int, error) {
+	b, err := ioutil.ReadFile(config.Global().PIDFileLocation)
+	if err != nil {
+		return 0, err
+	}
+	return strconv.Atoi(string(b))
+}
+
 // afterConfSetup takes care of non-sensical config values (such as zero
 // timeouts) and sets up a few globals that depend on the config.
 func afterConfSetup(conf *config.Config) {
@@ -1096,7 +1111,7 @@ var hostDetails struct {
 
 func getHostDetails() {
 	var err error
-	if hostDetails.PID, err = pidfile.Read(); err != nil {
+	if hostDetails.PID, err = readPIDFromFile(); err != nil {
 		mainLog.Error("Failed ot get host pid: ", err)
 	}
 	if hostDetails.Hostname, err = os.Hostname(); err != nil {

go.mod

@@ -28,9 +28,7 @@ require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/emanoelxavier/openid2go v0.0.0-20190718021401-6345b638bfc9 // indirect
 	github.com/evalphobia/logrus_sentry v0.8.2
-	github.com/facebookgo/atomicfile v0.0.0-20151019160806-2de1f203e7d5 // indirect
 	github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a // indirect
-	github.com/facebookgo/pidfile v0.0.0-20150612191647-f242e2999868
 	github.com/franela/goblin v0.0.0-20181003173013-ead4ad1d2727 // indirect
 	github.com/franela/goreq v0.0.0-20171204163338-bcd34c9993f8
 	github.com/gemnasium/logrus-graylog-hook v2.0.7+incompatible

go.sum

@@ -28,8 +28,6 @@ github.com/TykTechnologies/leakybucket v0.0.0-20170301023702-71692c943e3c h1:j6f
 github.com/TykTechnologies/leakybucket v0.0.0-20170301023702-71692c943e3c/go.mod h1:GnHUbsQx+ysI10osPhUdTmsxcE7ef64cVp38Fdyd7e0=
 github.com/TykTechnologies/murmur3 v0.0.0-20180602122059-1915e687e465 h1:A2gBjoX8aF0G3GHEpHyj2f0ixuPkCgcGqmPdKHSkW+0=
 github.com/TykTechnologies/murmur3 v0.0.0-20180602122059-1915e687e465/go.mod h1:sqH/SPFr11m9cahie7ulBuBX9TOhfBX1sp+qf9jh3Vg=
-github.com/TykTechnologies/openid2go v0.0.0-20160817213554-aab5ce1231ab h1:mDQXuVURkWTbTPlxOWom6c68xdWzp6HQeWAEqv4l7Vo=
-github.com/TykTechnologies/openid2go v0.0.0-20160817213554-aab5ce1231ab/go.mod h1:rGlqNE4CvxZIeiHp0mgrw+/jdGSjJzkZ0n78hhHMdfM=
 github.com/TykTechnologies/openid2go v0.0.0-20200122120050-1b642583380a h1:EJ9SLNrXbH0ywWNb/AbnXlBAgJWVBoRO6UpDOzze3H4=
 github.com/TykTechnologies/openid2go v0.0.0-20200122120050-1b642583380a/go.mod h1:rGlqNE4CvxZIeiHp0mgrw+/jdGSjJzkZ0n78hhHMdfM=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
@@ -67,12 +65,8 @@ github.com/emanoelxavier/openid2go v0.0.0-20190718021401-6345b638bfc9/go.mod h1:
 github.com/envoyproxy/go-control-plane v0.6.9/go.mod h1:SBwIajubJHhxtWwsL9s8ss4safvEdbitLhGGK48rN6g=
 github.com/evalphobia/logrus_sentry v0.8.2 h1:dotxHq+YLZsT1Bb45bB5UQbfCh3gM/nFFetyN46VoDQ=
 github.com/evalphobia/logrus_sentry v0.8.2/go.mod h1:pKcp+vriitUqu9KiWj/VRFbRfFNUwz95/UkgG8a6MNc=
-github.com/facebookgo/atomicfile v0.0.0-20151019160806-2de1f203e7d5 h1:BBso6MBKW8ncyZLv37o+KNyy0HrrHgfnOaGQC2qvN+A=
-github.com/facebookgo/atomicfile v0.0.0-20151019160806-2de1f203e7d5/go.mod h1:JpoxHjuQauoxiFMl1ie8Xc/7TfLuMZ5eOCONd1sUBHg=
 github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a h1:yDWHCSQ40h88yih2JAcL6Ls/kVkSE8GFACTGVnMPruw=
 github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a/go.mod h1:7Ga40egUymuWXxAe151lTNnCv97MddSOVsjpPPkityA=
-github.com/facebookgo/pidfile v0.0.0-20150612191647-f242e2999868 h1:KZ75X3ZCl6yy4jg9R1ziYoCZFDBRqildm+fGComWU7U=
-github.com/facebookgo/pidfile v0.0.0-20150612191647-f242e2999868/go.mod h1:3Hzo46xzfVpIdv4lJw7YBp9fUJ7HpUgbjH1fFDgy4qM=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
 github.com/franela/goblin v0.0.0-20181003173013-ead4ad1d2727 h1:eouy4stZdUKn7n98c1+rdUTxWMg+jvhP+oHt0K8fiug=
@@ -265,8 +259,6 @@ github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 h1:nn5Wsu0esKSJiIVhscUt
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
-github.com/square/go-jose v0.0.0-20161027010314-63d7cfa0284d h1:QyNGtv0d6JyxKalOUN74OQDAY+Ivrtywpv8mDvnd9sc=
-github.com/square/go-jose v0.0.0-20161027010314-63d7cfa0284d/go.mod h1:7MxpAF/1WTVUu8Am+T5kNy+t0902CaLWM4Z745MkOa8=
 github.com/square/go-jose v2.4.1+incompatible h1:KFYc54wTtgnd3x4B/Y7Zr1s/QaEx2BNzRsB3Hae5LHo=
 github.com/square/go-jose v2.4.1+incompatible/go.mod h1:7MxpAF/1WTVUu8Am+T5kNy+t0902CaLWM4Z745MkOa8=
 github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=
@@ -394,4 +386,4 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 rsc.io/letsencrypt v0.0.2 h1:CWRvaqcmyyWMhhhGes73TvuIjf7O3Crq6F+Xid/cWNI=
-rsc.io/letsencrypt v0.0.2/go.mod h1:buyQKZ6IXrRnB7TdkHP0RyEybLx18HHyOSoTyoOLqNY=
+rsc.io/letsencrypt v0.0.2/go.mod h1:buyQKZ6IXrRnB7TdkHP0RyEybLx18HHyOSoTyoOLqNY=