[#300] pool: Move 'healthCheck' to separate file

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

pool/healthcheck.go

@@ -0,0 +1,47 @@
+package pool
+
+import (
+	"context"
+	"time"
+)
+
+type healthCheck struct {
+	cancel   context.CancelFunc
+	closedCh chan struct{}
+
+	clientRebalanceInterval time.Duration
+}
+
+func newHealthCheck(clientRebalanceInterval time.Duration) *healthCheck {
+	var h healthCheck
+	h.clientRebalanceInterval = clientRebalanceInterval
+	h.closedCh = make(chan struct{})
+	return &h
+}
+
+// startRebalance runs loop to monitor connection healthy status.
+func (h *healthCheck) startRebalance(ctx context.Context, callback func(ctx context.Context)) {
+	ctx, cancel := context.WithCancel(ctx)
+	h.cancel = cancel
+
+	go func() {
+		ticker := time.NewTicker(h.clientRebalanceInterval)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ctx.Done():
+				close(h.closedCh)
+				return
+			case <-ticker.C:
+				callback(ctx)
+				ticker.Reset(h.clientRebalanceInterval)
+			}
+		}
+	}()
+}
+
+func (h *healthCheck) stopRebalance() {
+	h.cancel()
+	<-h.closedCh
+}

pool/pool.go

@@ -1951,20 +1951,6 @@ type connectionManager struct {
 	healthChecker   *healthCheck
 }
 
-type healthCheck struct {
-	cancel   context.CancelFunc
-	closedCh chan struct{}
-
-	clientRebalanceInterval time.Duration
-}
-
-func newHealthCheck(clientRebalanceInterval time.Duration) *healthCheck {
-	var h healthCheck
-	h.clientRebalanceInterval = clientRebalanceInterval
-	h.closedCh = make(chan struct{})
-	return &h
-}
-
 type innerPool struct {
 	lock    sync.RWMutex
 	sampler *sampler
@@ -2200,33 +2186,6 @@ func adjustNodeParams(nodeParams []NodeParam) ([]*nodesParam, error) {
 	return nodesParams, nil
 }
 
-// startRebalance runs loop to monitor connection healthy status.
-func (h *healthCheck) startRebalance(ctx context.Context, callback func(ctx context.Context)) {
-	ctx, cancel := context.WithCancel(ctx)
-	h.cancel = cancel
-
-	go func() {
-		ticker := time.NewTicker(h.clientRebalanceInterval)
-		defer ticker.Stop()
-
-		for {
-			select {
-			case <-ctx.Done():
-				close(h.closedCh)
-				return
-			case <-ticker.C:
-				callback(ctx)
-				ticker.Reset(h.clientRebalanceInterval)
-			}
-		}
-	}()
-}
-
-func (h *healthCheck) stopRebalance() {
-	h.cancel()
-	<-h.closedCh
-}
-
 func (cm *connectionManager) updateNodesHealth(ctx context.Context, buffers [][]float64) {
 	wg := sync.WaitGroup{}
 	for i, inner := range cm.innerPools {