Fix cluster refresh failed when using pasword file with isCluster mode

.drone.yml

@@ -74,6 +74,16 @@ services:
     pull: if-not-exists
     ports: [ 7000, 7001, 7002, 7003, 7004, 7005 ]
 
+  - name: redis-cluster-password
+    image: bitnami/redis-cluster
+    environment:
+      REDIS_PORT_NUMBER: 7006
+      REDIS_PASSWORD: redis-password
+      REDIS_CLUSTER_CREATOR: yes
+      REDIS_NODES: redis-cluster-password:7006
+    ports:
+      - 7006
+
   - name: tile38
     image: tile38/tile38:latest
     pull: if-not-exists

Makefile

@@ -40,9 +40,10 @@ test:
 	TEST_USER_PWD_REDIS_URI="redis://exporter:exporter-password@pwd-redis6:6390" \
 	TEST_REDIS_CLUSTER_MASTER_URI="redis://redis-cluster:7000" \
 	TEST_REDIS_CLUSTER_SLAVE_URI="redis://redis-cluster:7005" \
+	TEST_REDIS_CLUSTER_PASSWORD_URI="redis://redis-cluster-password:7006" \
 	TEST_TILE38_URI="redis://tile38:9851" \
 	TEST_REDIS_SENTINEL_URI="redis://redis-sentinel:26379" \
-	go test -v -covermode=atomic -cover -race -coverprofile=coverage.txt -p 1 ./...
+	go test -v -covermode=atomic -cover -race -coverprofile=coverage.txt -p 1 ./... 
 
 .PHONY: lint
 lint:

contrib/docker-compose-for-tests.yml

@@ -53,6 +53,16 @@ services:
     image: grokzen/redis-cluster
     ports: [ "7000", "7001", "7002", "7003", "7004", "7005" ]
 
+  redis-cluster-password:
+    image: bitnami/redis-cluster
+    environment:
+      - REDIS_PORT_NUMBER=7006
+      - REDIS_PASSWORD=redis-password
+      - REDIS_CLUSTER_CREATOR=yes
+      - REDIS_NODES=redis-cluster-password:7006
+    ports:
+      - "7006"
+
   redis-sentinel:
     image: docker.io/bitnami/redis-sentinel:6.2-debian-10
     environment:

exporter/redis.go

@@ -67,6 +67,16 @@ func (e *Exporter) connectToRedis() (redis.Conn, error) {
 
 func (e *Exporter) connectToRedisCluster() (redis.Conn, error) {
 	uri := e.redisAddr
+	if !strings.Contains(uri, "://") {
+		uri = "redis://" + uri
+	}
+
+	options, err := e.configureOptions(uri)
+	if err != nil {
+		return nil, err
+	}
+
+	// remove url scheme for redis.Cluster.StartupNodes
 	if strings.Contains(uri, "://") {
 		u, _ := url.Parse(uri)
 		if u.Port() == "" {
@@ -80,11 +90,6 @@ func (e *Exporter) connectToRedisCluster() (redis.Conn, error) {
 		}
 	}
 
-	options, err := e.configureOptions(uri)
-	if err != nil {
-		return nil, err
-	}
-
 	log.Debugf("Creating cluster object")
 	cluster := redisc.Cluster{
 		StartupNodes: []string{uri},

exporter/redis_test.go

@@ -1,13 +1,15 @@
 package exporter
 
 import (
+	"bytes"
 	"net/http/httptest"
 	"net/url"
 	"os"
 	"strings"
 	"testing"
 
 	"github.com/prometheus/client_golang/prometheus"
+	log "github.com/sirupsen/logrus"
 )
 
 func TestHostVariations(t *testing.T) {
@@ -111,3 +113,46 @@ func TestPasswordInvalid(t *testing.T) {
 		t.Errorf(`error, expected string "%s" in body, got body: \n\n%s`, want, body)
 	}
 }
+
+func TestConnectToClusterUingPasswordFile(t *testing.T) {
+	cluster_host := os.Getenv("TEST_REDIS_CLUSTER_PASSWORD_URI")
+	if cluster_host == "" {
+		t.Skipf("TEST_REDIS_CLUSTER_PASSWORD_URI is not set")
+	}
+	passMap := map[string]string{"redis://redis-cluster-password:7006": "redis-password"}
+	wrongPassMap := map[string]string{"redis://redis-cluster-password-wrong:7006": "redis-password"}
+
+	tsts := []struct {
+		name         string
+		isCluster    bool
+		passMap      map[string]string
+		refreshError bool
+	}{
+		{name: "ConnectToCluster using passord file witch cluster mode", isCluster: true, passMap: passMap, refreshError: false},
+		{name: "ConnectToCluster using password file without cluster mode", isCluster: false, passMap: passMap, refreshError: false},
+		{name: "ConnectToCluster using password file witch cluster mode failed", isCluster: false, passMap: wrongPassMap, refreshError: true},
+	}
+	for _, tst := range tsts {
+		t.Run(tst.name, func(t *testing.T) {
+			e, _ := NewRedisExporter(cluster_host, Options{
+				SkipTLSVerification: true,
+				PasswordMap:         tst.passMap,
+				IsCluster:           tst.isCluster,
+			})
+			var buf bytes.Buffer
+			log.SetOutput(&buf)
+			defer func() {
+				log.SetOutput(os.Stderr)
+			}()
+			_, err := e.connectToRedisCluster()
+			if strings.Contains(buf.String(), "Cluster refresh failed:") && !tst.refreshError {
+				t.Errorf("Test Cluster connection Failed error")
+			}
+			if err != nil {
+				t.Errorf("Test Cluster connection Failed-connection error")
+			}
+
+		})
+	}
+
+}