Fix cluster pipeline tests.

cluster.go

@@ -95,18 +95,22 @@ func newClusterNode(clOpt *ClusterOptions, addr string) *clusterNode {
 	}
 
 	if clOpt.RouteByLatency {
-		const probes = 10
-		for i := 0; i < probes; i++ {
-			t1 := time.Now()
-			node.Client.Ping()
-			node.Latency += time.Since(t1)
-		}
-		node.Latency = node.Latency / probes
+		node.updateLatency()
 	}
 
 	return &node
 }
 
+func (n *clusterNode) updateLatency() {
+	const probes = 10
+	for i := 0; i < probes; i++ {
+		start := time.Now()
+		n.Client.Ping()
+		n.Latency += time.Since(start)
+	}
+	n.Latency = n.Latency / probes
+}
+
 func (n *clusterNode) Loading() bool {
 	return !n.loading.IsZero() && time.Since(n.loading) < time.Minute
 }
@@ -290,14 +294,19 @@ func (c *clusterState) slotSlaveNode(slot int) (*clusterNode, error) {
 }
 
 func (c *clusterState) slotClosestNode(slot int) (*clusterNode, error) {
+	const threshold = time.Millisecond
+
 	nodes := c.slotNodes(slot)
 	if len(nodes) == 0 {
 		return c.nodes.Random()
 	}
 
 	var node *clusterNode
 	for _, n := range nodes {
-		if node == nil || n.Latency < node.Latency {
+		if n.Loading() {
+			continue
+		}
+		if node == nil || node.Latency-n.Latency > threshold {
 			node = n
 		}
 	}

cluster_test.go

@@ -6,15 +6,14 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-
 	"testing"
 	"time"
 
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"gopkg.in/redis.v5"
 	"gopkg.in/redis.v5/internal/hashtag"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
 )
 
 type clusterScenario struct {
@@ -24,10 +23,6 @@ type clusterScenario struct {
 	clients   map[string]*redis.Client
 }
 
-func (s *clusterScenario) primary() *redis.Client {
-	return s.clients[s.ports[0]]
-}
-
 func (s *clusterScenario) masters() []*redis.Client {
 	result := make([]*redis.Client, 3)
 	for pos, port := range s.ports[:3] {
@@ -157,6 +152,9 @@ func slotEqual(s1, s2 redis.ClusterSlot) bool {
 	if s1.End != s2.End {
 		return false
 	}
+	if len(s1.Nodes) != len(s2.Nodes) {
+		return false
+	}
 	for i, n1 := range s1.Nodes {
 		if n1.Addr != s2.Nodes[i].Addr {
 			return false
@@ -182,9 +180,10 @@ func stopCluster(scenario *clusterScenario) error {
 //------------------------------------------------------------------------------
 
 var _ = Describe("ClusterClient", func() {
+	var opt *redis.ClusterOptions
 	var client *redis.ClusterClient
 
-	describeClusterClient := func() {
+	assertClusterClient := func() {
 		It("should CLUSTER SLOTS", func() {
 			res, err := client.ClusterSlots().Result()
 			Expect(err).NotTo(HaveOccurred())
@@ -377,11 +376,13 @@ var _ = Describe("ClusterClient", func() {
 			var pipe *redis.Pipeline
 
 			assertPipeline := func() {
-				It("follows redirects", func() {
-					slot := hashtag.Slot("A")
-					Expect(client.SwapSlotNodes(slot)).To(Equal([]string{"127.0.0.1:8224", "127.0.0.1:8221"}))
+				keys := []string{"A", "B", "C", "D", "E", "F", "G"}
 
-					keys := []string{"A", "B", "C", "D", "E", "F", "G"}
+				It("follows redirects", func() {
+					for _, key := range keys {
+						slot := hashtag.Slot(key)
+						client.SwapSlotNodes(slot)
+					}
 
 					for i, key := range keys {
 						pipe.Set(key, key+"_value", 0)
@@ -391,32 +392,42 @@ var _ = Describe("ClusterClient", func() {
 					Expect(err).NotTo(HaveOccurred())
 					Expect(cmds).To(HaveLen(14))
 
+					if opt.RouteByLatency {
+						return
+					}
+
+					for _, key := range keys {
+						slot := hashtag.Slot(key)
+						client.SwapSlotNodes(slot)
+					}
+
 					for _, key := range keys {
 						pipe.Get(key)
 						pipe.TTL(key)
 					}
 					cmds, err = pipe.Exec()
 					Expect(err).NotTo(HaveOccurred())
 					Expect(cmds).To(HaveLen(14))
-					Expect(cmds[0].(*redis.StringCmd).Val()).To(Equal("A_value"))
-					Expect(cmds[1].(*redis.DurationCmd).Val()).To(BeNumerically("~", 1*time.Hour, time.Second))
-					Expect(cmds[6].(*redis.StringCmd).Val()).To(Equal("D_value"))
-					Expect(cmds[7].(*redis.DurationCmd).Val()).To(BeNumerically("~", 4*time.Hour, time.Second))
-					Expect(cmds[12].(*redis.StringCmd).Val()).To(Equal("G_value"))
-					Expect(cmds[13].(*redis.DurationCmd).Val()).To(BeNumerically("~", 7*time.Hour, time.Second))
+
+					for i, key := range keys {
+						get := cmds[i*2].(*redis.StringCmd)
+						Expect(get.Val()).To(Equal(key + "_value"))
+
+						ttl := cmds[(i*2)+1].(*redis.DurationCmd)
+						Expect(ttl.Val()).To(BeNumerically("~", time.Duration(i+1)*time.Hour, time.Second))
+					}
 				})
 
 				It("works with missing keys", func() {
-					Expect(client.Set("A", "A_value", 0).Err()).NotTo(HaveOccurred())
-					Expect(client.Set("C", "C_value", 0).Err()).NotTo(HaveOccurred())
-
-					var a, b, c *redis.StringCmd
-					cmds, err := client.Pipelined(func(pipe *redis.Pipeline) error {
-						a = pipe.Get("A")
-						b = pipe.Get("B")
-						c = pipe.Get("C")
-						return nil
-					})
+					pipe.Set("A", "A_value", 0)
+					pipe.Set("C", "C_value", 0)
+					_, err := pipe.Exec()
+					Expect(err).NotTo(HaveOccurred())
+
+					a := pipe.Get("A")
+					b := pipe.Get("B")
+					c := pipe.Get("C")
+					cmds, err := pipe.Exec()
 					Expect(err).To(Equal(redis.Nil))
 					Expect(cmds).To(HaveLen(3))
 
@@ -476,7 +487,8 @@ var _ = Describe("ClusterClient", func() {
 
 	Describe("default ClusterClient", func() {
 		BeforeEach(func() {
-			client = cluster.clusterClient(redisClusterOptions())
+			opt = redisClusterOptions()
+			client = cluster.clusterClient(opt)
 
 			_ = client.ForEachMaster(func(master *redis.Client) error {
 				return master.FlushDb().Err()
@@ -487,12 +499,12 @@ var _ = Describe("ClusterClient", func() {
 			Expect(client.Close()).NotTo(HaveOccurred())
 		})
 
-		describeClusterClient()
+		assertClusterClient()
 	})
 
 	Describe("ClusterClient with RouteByLatency", func() {
 		BeforeEach(func() {
-			opt := redisClusterOptions()
+			opt = redisClusterOptions()
 			opt.RouteByLatency = true
 			client = cluster.clusterClient(opt)
 
@@ -506,7 +518,7 @@ var _ = Describe("ClusterClient", func() {
 			Expect(client.Close()).NotTo(HaveOccurred())
 		})
 
-		describeClusterClient()
+		assertClusterClient()
 	})
 })