[#1868] Reload config for pprof and metrics on SIGHUP

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

cmd/frostfs-node/worker.go

@@ -4,31 +4,46 @@ import (
 	"context"
 )
 
-type worker interface {
-	Run(context.Context)
-}
-
-type workerFromFunc struct {
-	fn func(context.Context)
+type worker struct {
+	name string
+	fn   func(context.Context)
 }
 
 func newWorkerFromFunc(fn func(ctx context.Context)) worker {
-	return &workerFromFunc{
+	return worker{
 		fn: fn,
 	}
 }
 
-func (w *workerFromFunc) Run(ctx context.Context) {
-	w.fn(ctx)
-}
-
 func startWorkers(c *cfg) {
 	for _, wrk := range c.workers {
-		c.wg.Add(1)
-
-		go func(w worker) {
-			w.Run(c.ctx)
-			c.wg.Done()
-		}(wrk)
+		startWorker(c, wrk)
 	}
 }
+
+func startWorker(c *cfg, wrk worker) {
+	c.wg.Add(1)
+
+	go func(w worker) {
+		w.fn(c.ctx)
+		c.wg.Done()
+	}(wrk)
+}
+
+func delWorker(c *cfg, name string) {
+	for i, worker := range c.workers {
+		if worker.name == name {
+			c.workers = append(c.workers[:i], c.workers[i+1:]...)
+			return
+		}
+	}
+}
+
+func getWorker(c *cfg, name string) *worker {
+	for _, wrk := range c.workers {
+		if wrk.name == name {
+			return &wrk
+		}
+	}
+	return nil
+}