From ef07c1a3c96e0a1c39c00eee20b7bbeb7855dcdb Mon Sep 17 00:00:00 2001
From: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>
Date: Tue, 21 Nov 2023 15:07:37 +0300
Subject: [PATCH] [#552] Add sysd notifications to storage service

Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>
---
 cmd/frostfs-node/config.go  | 12 ++++++++++++
 cmd/frostfs-node/control.go | 19 ++++++++++++++-----
 config/example/node.yaml    |  3 +++
 3 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/cmd/frostfs-node/config.go b/cmd/frostfs-node/config.go
index 82b01b563..27c028bae 100644
--- a/cmd/frostfs-node/config.go
+++ b/cmd/frostfs-node/config.go
@@ -62,6 +62,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/util/response"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/sdnotify"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/state"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/logging/lokicore"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
@@ -361,6 +362,8 @@ type internals struct {
 	healthStatus *atomic.Int32
 	// is node under maintenance
 	isMaintenance atomic.Bool
+
+	sdNotify bool
 }
 
 // starts node's maintenance.
@@ -632,9 +635,18 @@ func initInternals(appCfg *config.Config, log *logger.Logger) internals {
 		log:          log,
 		apiVersion:   version.Current(),
 		healthStatus: &healthStatus,
+		sdNotify:     initSdNotify(appCfg),
 	}
 }
 
+func initSdNotify(appCfg *config.Config) bool {
+	if config.BoolSafe(appCfg.Sub("systemdnotify"), "enabled") {
+		fatalOnErr(sdnotify.InitSocket())
+		return true
+	}
+	return false
+}
+
 func initShared(appCfg *config.Config, key *keys.PrivateKey, netState *networkState, relayOnly bool) shared {
 	var netAddr network.AddressGroup
 
diff --git a/cmd/frostfs-node/control.go b/cmd/frostfs-node/control.go
index 6b603d433..ee2a2952a 100644
--- a/cmd/frostfs-node/control.go
+++ b/cmd/frostfs-node/control.go
@@ -110,12 +110,21 @@ func (c *cfg) HealthStatus() control.HealthStatus {
 }
 
 func (c *cfg) notifySystemd(st control.HealthStatus) {
-	status := fmt.Sprintf("%v, %v", st.Number(), st)
-	err := sdnotify.Status(status)
-	if err == nil {
-		c.log.Info(fmt.Sprintf("reported STATUS=\"%v\" to systemd", status))
+	if !c.sdNotify {
+		return
+	}
+	var err error
+	switch st {
+	case control.HealthStatus_READY:
+		err = sdnotify.FlagAndStatus(sdnotify.ReadyEnabled)
+	case control.HealthStatus_SHUTTING_DOWN:
+		err = sdnotify.FlagAndStatus(sdnotify.StoppingEnabled)
+	case control.HealthStatus_RECONFIGURING:
+		err = sdnotify.FlagAndStatus(sdnotify.ReloadingEnabled)
+	default:
+		err = sdnotify.Status(fmt.Sprintf("%v", st))
 	}
 	if err != nil {
-		c.log.Error(logs.FailedToReportStatusToSystemd, zap.String("error", err.Error()))
+		c.log.Error(logs.FailedToReportStatusToSystemd, zap.Error(err))
 	}
 }
diff --git a/config/example/node.yaml b/config/example/node.yaml
index 1355113a3..c6a2be9ac 100644
--- a/config/example/node.yaml
+++ b/config/example/node.yaml
@@ -1,6 +1,9 @@
 logger:
   level: debug  # logger level: one of "debug", "info" (default), "warn", "error", "dpanic", "panic", "fatal"
 
+systemdnotify:
+  enabled: true
+
 pprof:
   enabled: true
   address: localhost:6060  # endpoint for Node profiling