[*] refactor ConsulLeaderChecker

Author: pashagolub

checker/consul_leader_checker.go

@@ -1,7 +1,9 @@
 package checker
 
 import (
+	"cmp"
 	"context"
+	"fmt"
 	"net/url"
 	"time"
 
@@ -11,83 +13,68 @@ import (
 
 // ConsulLeaderChecker is used to check state of the leader key in Consul
 type ConsulLeaderChecker struct {
-	key       string
-	nodename  string
-	apiClient *api.Client
+	*vipconfig.Config
+	*api.Client
 }
 
-// naming this cConf to avoid conflict with conf in etcd_leader_checker.go
-var cConf *vipconfig.Config
-
 // NewConsulLeaderChecker returns a new instance
-func NewConsulLeaderChecker(con *vipconfig.Config) (*ConsulLeaderChecker, error) {
-	cConf = con
-	lc := &ConsulLeaderChecker{
-		key:      cConf.TriggerKey,
-		nodename: cConf.TriggerValue,
-	}
+func NewConsulLeaderChecker(con *vipconfig.Config) (lc *ConsulLeaderChecker, err error) {
+	lc = &ConsulLeaderChecker{Config: con}
 
-	url, err := url.Parse(cConf.Endpoints[0])
+	url, err := url.Parse(con.Endpoints[0])
 	if err != nil {
 		return nil, err
 	}
-	address := url.Hostname() + ":" + url.Port()
 
 	config := &api.Config{
-		Address:  address,
+		Address:  fmt.Sprintf("%s:%s", url.Hostname(), url.Port()),
 		Scheme:   url.Scheme,
 		WaitTime: time.Second,
+		Token:    cmp.Or(con.ConsulToken, ""),
 	}
 
-	if cConf.ConsulToken != "" {
-		config.Token = cConf.ConsulToken
-	}
-
-	apiClient, err := api.NewClient(config)
-	if err != nil {
+	if lc.Client, err = api.NewClient(config); err != nil {
 		return nil, err
 	}
 
-	lc.apiClient = apiClient
-
 	return lc, nil
 }
 
 // GetChangeNotificationStream checks the status in the loop
 func (c *ConsulLeaderChecker) GetChangeNotificationStream(ctx context.Context, out chan<- bool) error {
-	kv := c.apiClient.KV()
+	kv := c.Client.KV()
 
 	queryOptions := &api.QueryOptions{
 		RequireConsistent: true,
 	}
 
 checkLoop:
 	for {
-		resp, _, err := kv.Get(c.key, queryOptions)
+		resp, _, err := kv.Get(c.TriggerKey, queryOptions)
 		if err != nil {
 			if ctx.Err() != nil {
 				break checkLoop
 			}
-			cConf.Logger.Sugar().Error("consul error: ", err)
+			c.Logger.Sugar().Error("consul error: ", err)
 			out <- false
-			time.Sleep(time.Duration(cConf.Interval) * time.Millisecond)
+			time.Sleep(time.Duration(c.Interval) * time.Millisecond)
 			continue
 		}
 		if resp == nil {
-			cConf.Logger.Sugar().Errorf("Cannot get variable for key %s. Will try again in a second.", c.key)
+			c.Logger.Sugar().Errorf("Cannot get variable for key %s. Will try again in a second.", c.TriggerKey)
 			out <- false
-			time.Sleep(time.Duration(cConf.Interval) * time.Millisecond)
+			time.Sleep(time.Duration(c.Interval) * time.Millisecond)
 			continue
 		}
 
-		state := string(resp.Value) == c.nodename
+		state := string(resp.Value) == c.TriggerValue
 		queryOptions.WaitIndex = resp.ModifyIndex
 
 		select {
 		case <-ctx.Done():
 			break checkLoop
 		case out <- state:
-			time.Sleep(time.Duration(cConf.Interval) * time.Millisecond)
+			time.Sleep(time.Duration(c.Interval) * time.Millisecond)
 			continue
 		}
 	}