metrics, pprof: make their closers map

Add consts for the metric and profiler names. Make `c.veryLastClosers` a map.

Signed-off-by: Andrey Butusov <[email protected]>

cmd/neofs-node/config.go

@@ -73,6 +73,10 @@ const maxMsgSize = 4 << 20 // transport msg limit 4 MiB
 // for each contract listener.
 const notificationHandlerPoolSize = 10
 
+const metricName = "prometheus"
+
+const profilerName = "pprof"
+
 // applicationConfiguration reads and stores component-specific configuration
 // values. It should not store any application helpers structs (pointers to shared
 // structs).
@@ -289,7 +293,7 @@ type internals struct {
 	closers []func()
 	// services that are useful for debug (e.g. when a regular closer does not
 	// close), must be close at the very end of application life cycle
-	veryLastClosers []func()
+	veryLastClosers map[string]func()
 
 	apiVersion   version.Version
 	healthStatus atomic.Int32
@@ -638,6 +642,8 @@ func initCfg(appCfg *config.Config) *cfg {
 		c.basics.networkState.metrics = c.metricsCollector
 	}
 
+	c.veryLastClosers = make(map[string]func())
+
 	c.onShutdown(c.clientCache.CloseAll)    // clean up connections
 	c.onShutdown(c.bgClientCache.CloseAll)  // clean up connections
 	c.onShutdown(c.putClientCache.CloseAll) // clean up connections

cmd/neofs-node/main.go

@@ -55,9 +55,9 @@ func main() {
 
 	c := initCfg(appCfg)
 
-	preRunAndLog(c, "prometheus", initMetrics(c))
+	preRunAndLog(c, metricName, initMetrics(c))
 
-	preRunAndLog(c, "pprof", initProfiler(c))
+	preRunAndLog(c, profilerName, initProfiler(c))
 
 	initApp(c)
 
@@ -97,7 +97,7 @@ func preRunAndLog(c *cfg, name string, srv *httputil.Server) {
 		})
 	}()
 
-	c.veryLastClosers = append(c.veryLastClosers, func() {
+	c.veryLastClosers[name] = func() {
 		c.log.Debug(fmt.Sprintf("shutting down %s service", name))
 
 		err := srv.Shutdown()
@@ -108,7 +108,7 @@ func preRunAndLog(c *cfg, name string, srv *httputil.Server) {
 		}
 
 		c.log.Debug(fmt.Sprintf("%s service has been stopped", name))
-	})
+	}
 }
 
 func initAndLog(c *cfg, name string, initializer func(*cfg)) {