From eca7ac9f0d4096e86131ff0f068862320af5eb82 Mon Sep 17 00:00:00 2001
From: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>
Date: Tue, 21 Nov 2023 12:08:49 +0300
Subject: [PATCH] [#552] Add sdnotify package

To avoid using third-party dependencies.

Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>
---
 cmd/frostfs-node/control.go   |   7 ++--
 go.mod                        |   1 -
 go.sum                        | Bin 46999 -> 45864 bytes
 pkg/util/sdnotify/sdnotify.go |  59 ++++++++++++++++++++++++++++++++++
 4 files changed, 62 insertions(+), 5 deletions(-)
 create mode 100644 pkg/util/sdnotify/sdnotify.go

diff --git a/cmd/frostfs-node/control.go b/cmd/frostfs-node/control.go
index fcd84db3c..6b603d433 100644
--- a/cmd/frostfs-node/control.go
+++ b/cmd/frostfs-node/control.go
@@ -10,8 +10,8 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control"
 	controlSvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control/server"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/tree"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/sdnotify"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
-	sysdnotify "github.com/iguanesolutions/go-systemd/v5/notify"
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
 )
@@ -109,14 +109,13 @@ func (c *cfg) HealthStatus() control.HealthStatus {
 	return control.HealthStatus(c.healthStatus.Load())
 }
 
-func (c *cfg) notifySystemd(st control.HealthStatus) string {
+func (c *cfg) notifySystemd(st control.HealthStatus) {
 	status := fmt.Sprintf("%v, %v", st.Number(), st)
-	err := sysdnotify.Status(status)
+	err := sdnotify.Status(status)
 	if err == nil {
 		c.log.Info(fmt.Sprintf("reported STATUS=\"%v\" to systemd", status))
 	}
 	if err != nil {
 		c.log.Error(logs.FailedToReportStatusToSystemd, zap.String("error", err.Error()))
 	}
-	return fmt.Sprintf("%v, %v", st, control.HealthStatus_name[int32(st)])
 }
diff --git a/go.mod b/go.mod
index 3037a6167..3e79f7ff7 100644
--- a/go.mod
+++ b/go.mod
@@ -16,7 +16,6 @@ require (
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
 	github.com/google/uuid v1.4.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
-	github.com/iguanesolutions/go-systemd/v5 v5.1.1
 	github.com/klauspost/compress v1.17.4
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mr-tron/base58 v1.2.0
diff --git a/go.sum b/go.sum
index 780bdbcdbd1cc9f32d367400a9efc03fb377e0c2..15ae22422585062b9c83d02a3b832152a1cfb18f 100644
GIT binary patch
delta 14
WcmbRKo@vE1rVW-Bn^)MpuL1xzTL(G-

delta 990
zcmb`_J93*)6b9gl(`6M(8;#*!-ee{PMhKxNvJ8^k@w|Y6D*+b?H!MO$wvaM2NtyMe
z^%fGRi7bx_O|pRVo&WrEzWluU{B-qImJUC}_bm%}hJzBvF#L7kxE_#Y7Xrtn5vDTi
zcOv)^?Zsk;?Z^v>J<@s7IP#!m7yCrij5_sg94br0s&q_tpWdOkiik^jIHO}koIEIT
zN~##=<!|x2Y|1Lge7fd4HBUhbw$BR&CAf#eLvHHoO+O!LYGJ5m)V-Zc@&Ywr-#mIw
zS_~#5|MCS#cg#u6i=|fz3-JyVs<3UwVY_6&$f8YdBS(chHv3&;ye?MjmxpA&Q^c6g
zf&$@A4Jel4k6cE})9F3%1IH_dcBpK^tnzi#3nwI^^Q|y@fSNaq_<pFoV%rl}_)qQ$
zE1hH83-g}15FEitHjgtn=?1K|-e<@p^s)()8+OXtVQM#4k|etU@N;$jw}<x6qrC1H
z!heL%xy(zqy*TkXm_35IbO@8J)$>Z%&{Vwvx7JWuO^pb31?(-63zhMRnQ?ga1|7Q6
z2N_VuMVkBV#t7;dH5#Lfgq^O2#vP+fn~IoyICF{_*He0#$mY`X^jko|!*{9oO_rV>
Fe*t3SOf>)i

diff --git a/pkg/util/sdnotify/sdnotify.go b/pkg/util/sdnotify/sdnotify.go
new file mode 100644
index 000000000..7c3d2f1d2
--- /dev/null
+++ b/pkg/util/sdnotify/sdnotify.go
@@ -0,0 +1,59 @@
+package sdnotify
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strings"
+)
+
+const (
+	ReadyEnabled     = "READY=1"
+	StoppingEnabled  = "STOPPING=1"
+	ReloadingEnabled = "RELOADING=1"
+)
+
+var socket *net.UnixAddr
+
+// Initializes socket with provided name of
+// environment variable.
+func InitSocket() error {
+	notifySocket := os.Getenv("NOTIFY_SOCKET")
+	if notifySocket == "" {
+		return fmt.Errorf("\"NOTIFY_SOCKET\" environment variable is not present")
+	}
+	socket = &net.UnixAddr{
+		Name: notifySocket,
+		Net:  "unixgram",
+	}
+	return nil
+}
+
+// FlagAndStatus sends systemd a combination of a
+// well-known status and STATUS=%s{status}, separated by newline.
+func FlagAndStatus(status string) error {
+	status += "\nSTATUS=" + strings.TrimSuffix(status, "=1")
+	return Send(status)
+}
+
+// Status sends systemd notify STATUS=%s{status}.
+func Status(status string) error {
+	return Send(fmt.Sprintf("STATUS=%s", status))
+}
+
+// Send state through the notify socket if any.
+// If the notify socket was not detected, it returns an error.
+func Send(state string) error {
+	if socket == nil {
+		return fmt.Errorf("socket is not initialized")
+	}
+	conn, err := net.DialUnix(socket.Net, nil, socket)
+	if err != nil {
+		return fmt.Errorf("can't open unix socket: %v", err)
+	}
+	defer conn.Close()
+	if _, err = conn.Write([]byte(state)); err != nil {
+		return fmt.Errorf("can't write into the unix socket: %v", err)
+	}
+	return nil
+}