Merge fb59c1a2a1 into f1ffb55c9a

* Only check latencies once every 10 seconds with `routeByLatency`

`routeByLatency` currently checks latencies any time a server returns
a MOVED or READONLY reply. When a shard is down, the ClusterClient
chooses to issue the request to a random server, which returns a MOVED
reply. This causes a state refresh and a latency update on all servers.
This can lead to significant ping load to clusters with a large number
of clients.

This introduces logic to ping only once every 10 seconds, only
performing a latency update on a node during the `GC` function if the
latency was set later than 10 seconds ago.

Fixes https://github.com/redis/go-redis/issues/2782

* use UnixNano instead of Unix for better precision

---------

Co-authored-by: ofekshenawa <104765379+ofekshenawa@users.noreply.github.com>

.github/wordlist.txt

@@ -54,6 +54,7 @@ stunnel
 SynDump
 TCP
 TLS
+UnstableResp
 uri
 URI
 url
@@ -62,3 +63,5 @@ RedisStack
 RedisGears
 RedisTimeseries
 RediSearch
+RawResult
+RawVal

README.md

@@ -186,6 +186,21 @@ rdb := redis.NewClient(&redis.Options{
 #### Unstable RESP3 Structures for RediSearch Commands
 When integrating Redis with application functionalities using RESP3, it's important to note that some response structures aren't final yet. This is especially true for more complex structures like search and query results. We recommend using RESP2 when using the search and query capabilities, but we plan to stabilize the RESP3-based API-s in the coming versions. You can find more guidance in the upcoming release notes.
 
+To enable unstable RESP3, set the option in your client configuration:
+
+```go
+redis.NewClient(&redis.Options{
+			UnstableResp3: true,
+		})
+```
+**Note:** When UnstableResp3 mode is enabled, it's necessary to use RawResult() and RawVal() to retrieve a raw data.
+          Since, raw response is the only option for unstable search commands Val() and Result() calls wouldn't have any affect on them:
+
+```go
+res1, err := client.FTSearchWithArgs(ctx, "txt", "foo bar", &redis.FTSearchOptions{}).RawResult()
+val1 := client.FTSearchWithArgs(ctx, "txt", "foo bar", &redis.FTSearchOptions{}).RawVal()
+```
+
 ## Contributing
 
 Please see [out contributing guidelines](CONTRIBUTING.md) to help us improve this library!

command.go

@@ -1405,27 +1405,63 @@ func (cmd *MapStringSliceInterfaceCmd) Val() map[string][]interface{} {
 }
 
 func (cmd *MapStringSliceInterfaceCmd) readReply(rd *proto.Reader) (err error) {
-	n, err := rd.ReadMapLen()
+	readType, err := rd.PeekReplyType()
 	if err != nil {
 		return err
 	}
-	cmd.val = make(map[string][]interface{}, n)
+
-	for i := 0; i < n; i++ {
+	cmd.val = make(map[string][]interface{})
-		k, err := rd.ReadString()
+
+	if readType == proto.RespMap {
+		n, err := rd.ReadMapLen()
 		if err != nil {
 			return err
 		}
-		nn, err := rd.ReadArrayLen()
+		for i := 0; i < n; i++ {
-		if err != nil {
+			k, err := rd.ReadString()
-			return err
-		}
-		cmd.val[k] = make([]interface{}, nn)
-		for j := 0; j < nn; j++ {
-			value, err := rd.ReadReply()
 			if err != nil {
 				return err
 			}
-			cmd.val[k][j] = value
+			nn, err := rd.ReadArrayLen()
+			if err != nil {
+				return err
+			}
+			cmd.val[k] = make([]interface{}, nn)
+			for j := 0; j < nn; j++ {
+				value, err := rd.ReadReply()
+				if err != nil {
+					return err
+				}
+				cmd.val[k][j] = value
+			}
+		}
+	} else if readType == proto.RespArray {
+		// RESP2 response
+		n, err := rd.ReadArrayLen()
+		if err != nil {
+			return err
+		}
+
+		for i := 0; i < n; i++ {
+			// Each entry in this array is itself an array with key details
+			itemLen, err := rd.ReadArrayLen()
+			if err != nil {
+				return err
+			}
+
+			key, err := rd.ReadString()
+			if err != nil {
+				return err
+			}
+			cmd.val[key] = make([]interface{}, 0, itemLen-1)
+			for j := 1; j < itemLen; j++ {
+				// Read the inner array for timestamp-value pairs
+				data, err := rd.ReadReply()
+				if err != nil {
+					return err
+				}
+				cmd.val[key] = append(cmd.val[key], data)
+			}
 		}
 	}
 

doctests/home_json_example_test.go

@@ -0,0 +1,199 @@
+// EXAMPLE: go_home_json
+// HIDE_START
+package example_commands_test
+
+// HIDE_END
+// STEP_START import
+import (
+	"context"
+	"fmt"
+	"sort"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// STEP_END
+
+func ExampleClient_search_json() {
+	// STEP_START connect
+	ctx := context.Background()
+
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "", // no password docs
+		DB:       0,  // use default DB
+		Protocol: 2,
+	})
+	// STEP_END
+	// REMOVE_START
+	rdb.Del(ctx, "user:1", "user:2", "user:3")
+	rdb.FTDropIndex(ctx, "idx:users")
+	// REMOVE_END
+
+	// STEP_START create_data
+	user1 := map[string]interface{}{
+		"name":  "Paul John",
+		"email": "paul.john@example.com",
+		"age":   42,
+		"city":  "London",
+	}
+
+	user2 := map[string]interface{}{
+		"name":  "Eden Zamir",
+		"email": "eden.zamir@example.com",
+		"age":   29,
+		"city":  "Tel Aviv",
+	}
+
+	user3 := map[string]interface{}{
+		"name":  "Paul Zamir",
+		"email": "paul.zamir@example.com",
+		"age":   35,
+		"city":  "Tel Aviv",
+	}
+	// STEP_END
+
+	// STEP_START make_index
+	_, err := rdb.FTCreate(
+		ctx,
+		"idx:users",
+		// Options:
+		&redis.FTCreateOptions{
+			OnJSON: true,
+			Prefix: []interface{}{"user:"},
+		},
+		// Index schema fields:
+		&redis.FieldSchema{
+			FieldName: "$.name",
+			As:        "name",
+			FieldType: redis.SearchFieldTypeText,
+		},
+		&redis.FieldSchema{
+			FieldName: "$.city",
+			As:        "city",
+			FieldType: redis.SearchFieldTypeTag,
+		},
+		&redis.FieldSchema{
+			FieldName: "$.age",
+			As:        "age",
+			FieldType: redis.SearchFieldTypeNumeric,
+		},
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+	// STEP_END
+
+	// STEP_START add_data
+	_, err = rdb.JSONSet(ctx, "user:1", "$", user1).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	_, err = rdb.JSONSet(ctx, "user:2", "$", user2).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	_, err = rdb.JSONSet(ctx, "user:3", "$", user3).Result()
+
+	if err != nil {
+		panic(err)
+	}
+	// STEP_END
+
+	// STEP_START query1
+	findPaulResult, err := rdb.FTSearch(
+		ctx,
+		"idx:users",
+		"Paul @age:[30 40]",
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(findPaulResult)
+	// >>> {1 [{user:3 <nil> <nil> <nil> map[$:{"age":35,"city":"Tel Aviv"...
+	// STEP_END
+
+	// STEP_START query2
+	citiesResult, err := rdb.FTSearchWithArgs(
+		ctx,
+		"idx:users",
+		"Paul",
+		&redis.FTSearchOptions{
+			Return: []redis.FTSearchReturn{
+				{
+					FieldName: "$.city",
+					As:        "city",
+				},
+			},
+		},
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	sort.Slice(citiesResult.Docs, func(i, j int) bool {
+		return citiesResult.Docs[i].Fields["city"] < citiesResult.Docs[j].Fields["city"]
+	})
+
+	for _, result := range citiesResult.Docs {
+		fmt.Println(result.Fields["city"])
+	}
+	// >>> London
+	// >>> Tel Aviv
+	// STEP_END
+
+	// STEP_START query3
+	aggOptions := redis.FTAggregateOptions{
+		GroupBy: []redis.FTAggregateGroupBy{
+			{
+				Fields: []interface{}{"@city"},
+				Reduce: []redis.FTAggregateReducer{
+					{
+						Reducer: redis.SearchCount,
+						As:      "count",
+					},
+				},
+			},
+		},
+	}
+
+	aggResult, err := rdb.FTAggregateWithArgs(
+		ctx,
+		"idx:users",
+		"*",
+		&aggOptions,
+	).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	sort.Slice(aggResult.Rows, func(i, j int) bool {
+		return aggResult.Rows[i].Fields["city"].(string) <
+			aggResult.Rows[j].Fields["city"].(string)
+	})
+
+	for _, row := range aggResult.Rows {
+		fmt.Printf("%v - %v\n",
+			row.Fields["city"], row.Fields["count"],
+		)
+	}
+	// >>> City: London - 1
+	// >>> City: Tel Aviv - 2
+	// STEP_END
+
+	// Output:
+	// {1 [{user:3 <nil> <nil> <nil> map[$:{"age":35,"city":"Tel Aviv","email":"paul.zamir@example.com","name":"Paul Zamir"}]}]}
+	// London
+	// Tel Aviv
+	// London - 1
+	// Tel Aviv - 2
+}

osscluster.go

@@ -21,6 +21,10 @@ import (
 	"github.com/redis/go-redis/v9/internal/rand"
 )
 
+const (
+	minLatencyMeasurementInterval = 10 * time.Second
+)
+
 var errClusterNoNodes = fmt.Errorf("redis: cluster has no nodes")
 
 // ClusterOptions are used to configure a cluster client and should be
@@ -316,6 +320,10 @@ type clusterNode struct {
 	latency    uint32 // atomic
 	generation uint32 // atomic
 	failing    uint32 // atomic
+
+	// last time the latency measurement was performed for the node, stored in nanoseconds
+	// from epoch
+	lastLatencyMeasurement int64 // atomic
 }
 
 func newClusterNode(clOpt *ClusterOptions, addr string) *clusterNode {
@@ -368,6 +376,7 @@ func (n *clusterNode) updateLatency() {
 		latency = float64(dur) / float64(successes)
 	}
 	atomic.StoreUint32(&n.latency, uint32(latency+0.5))
+	n.SetLastLatencyMeasurement(time.Now())
 }
 
 func (n *clusterNode) Latency() time.Duration {
@@ -397,6 +406,10 @@ func (n *clusterNode) Generation() uint32 {
 	return atomic.LoadUint32(&n.generation)
 }
 
+func (n *clusterNode) LastLatencyMeasurement() int64 {
+	return atomic.LoadInt64(&n.lastLatencyMeasurement)
+}
+
 func (n *clusterNode) SetGeneration(gen uint32) {
 	for {
 		v := atomic.LoadUint32(&n.generation)
@@ -406,6 +419,15 @@ func (n *clusterNode) SetGeneration(gen uint32) {
 	}
 }
 
+func (n *clusterNode) SetLastLatencyMeasurement(t time.Time) {
+	for {
+		v := atomic.LoadInt64(&n.lastLatencyMeasurement)
+		if t.UnixNano() < v || atomic.CompareAndSwapInt64(&n.lastLatencyMeasurement, v, t.UnixNano()) {
+			break
+		}
+	}
+}
+
 //------------------------------------------------------------------------------
 
 type clusterNodes struct {
@@ -493,10 +515,11 @@ func (c *clusterNodes) GC(generation uint32) {
 	c.mu.Lock()
 
 	c.activeAddrs = c.activeAddrs[:0]
+	now := time.Now()
 	for addr, node := range c.nodes {
 		if node.Generation() >= generation {
 			c.activeAddrs = append(c.activeAddrs, addr)
-			if c.opt.RouteByLatency {
+			if c.opt.RouteByLatency && node.LastLatencyMeasurement() < now.Add(-minLatencyMeasurementInterval).UnixNano() {
 				go node.updateLatency()
 			}
 			continue

probabilistic.go

@@ -319,37 +319,69 @@ func (cmd *BFInfoCmd) Result() (BFInfo, error) {
 }
 
 func (cmd *BFInfoCmd) readReply(rd *proto.Reader) (err error) {
-	n, err := rd.ReadMapLen()
+	result := BFInfo{}
+
+	// Create a mapping from key names to pointers of struct fields
+	respMapping := map[string]*int64{
+		"Capacity":                 &result.Capacity,
+		"CAPACITY":                 &result.Capacity,
+		"Size":                     &result.Size,
+		"SIZE":                     &result.Size,
+		"Number of filters":        &result.Filters,
+		"FILTERS":                  &result.Filters,
+		"Number of items inserted": &result.ItemsInserted,
+		"ITEMS":                    &result.ItemsInserted,
+		"Expansion rate":           &result.ExpansionRate,
+		"EXPANSION":                &result.ExpansionRate,
+	}
+
+	// Helper function to read and assign a value based on the key
+	readAndAssignValue := func(key string) error {
+		fieldPtr, exists := respMapping[key]
+		if !exists {
+			return fmt.Errorf("redis: BLOOM.INFO unexpected key %s", key)
+		}
+
+		// Read the integer and assign to the field via pointer dereferencing
+		val, err := rd.ReadInt()
+		if err != nil {
+			return err
+		}
+		*fieldPtr = val
+		return nil
+	}
+
+	readType, err := rd.PeekReplyType()
 	if err != nil {
 		return err
 	}
 
-	var key string
+	if len(cmd.args) > 2 && readType == proto.RespArray {
-	var result BFInfo
+		n, err := rd.ReadArrayLen()
-	for f := 0; f < n; f++ {
-		key, err = rd.ReadString()
 		if err != nil {
 			return err
 		}
-
+		if key, ok := cmd.args[2].(string); ok && n == 1 {
-		switch key {
+			if err := readAndAssignValue(key); err != nil {
-		case "Capacity":
+				return err
-			result.Capacity, err = rd.ReadInt()
+			}
-		case "Size":
+		} else {
-			result.Size, err = rd.ReadInt()
+			return fmt.Errorf("redis: BLOOM.INFO invalid argument key type")
-		case "Number of filters":
-			result.Filters, err = rd.ReadInt()
-		case "Number of items inserted":
-			result.ItemsInserted, err = rd.ReadInt()
-		case "Expansion rate":
-			result.ExpansionRate, err = rd.ReadInt()
-		default:
-			return fmt.Errorf("redis: BLOOM.INFO unexpected key %s", key)
 		}
-
+	} else {
+		n, err := rd.ReadMapLen()
 		if err != nil {
 			return err
 		}
+		for i := 0; i < n; i++ {
+			key, err := rd.ReadString()
+			if err != nil {
+				return err
+			}
+			if err := readAndAssignValue(key); err != nil {
+				return err
+			}
+		}
 	}
 
 	cmd.val = result

redis.go

@@ -176,8 +176,6 @@ func (hs *hooksMixin) withProcessPipelineHook(
 }
 
 func (hs *hooksMixin) dialHook(ctx context.Context, network, addr string) (net.Conn, error) {
-	hs.hooksMu.Lock()
-	defer hs.hooksMu.Unlock()
 	return hs.current.dial(ctx, network, addr)
 }
 

redis_test.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"sync"
 	"testing"
 	"time"
 
@@ -633,3 +634,67 @@ var _ = Describe("Hook with MinIdleConns", func() {
 		}))
 	})
 })
+
+var _ = Describe("Dialer connection timeouts", func() {
+	var client *redis.Client
+
+	const dialSimulatedDelay = 1 * time.Second
+
+	BeforeEach(func() {
+		options := redisOptions()
+		options.Dialer = func(ctx context.Context, network, addr string) (net.Conn, error) {
+			// Simulated slow dialer.
+			// Note that the following sleep is deliberately not context-aware.
+			time.Sleep(dialSimulatedDelay)
+			return net.Dial("tcp", options.Addr)
+		}
+		options.MinIdleConns = 1
+		client = redis.NewClient(options)
+	})
+
+	AfterEach(func() {
+		err := client.Close()
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("does not contend on connection dial for concurrent commands", func() {
+		var wg sync.WaitGroup
+
+		const concurrency = 10
+
+		durations := make(chan time.Duration, concurrency)
+		errs := make(chan error, concurrency)
+
+		start := time.Now()
+		wg.Add(concurrency)
+
+		for i := 0; i < concurrency; i++ {
+			go func() {
+				defer wg.Done()
+
+				start := time.Now()
+				err := client.Ping(ctx).Err()
+				durations <- time.Since(start)
+				errs <- err
+			}()
+		}
+
+		wg.Wait()
+		close(durations)
+		close(errs)
+
+		// All commands should eventually succeed, after acquiring a connection.
+		for err := range errs {
+			Expect(err).NotTo(HaveOccurred())
+		}
+
+		// Each individual command should complete within the simulated dial duration bound.
+		for duration := range durations {
+			Expect(duration).To(BeNumerically("<", 2*dialSimulatedDelay))
+		}
+
+		// Due to concurrent execution, the entire test suite should also complete within
+		// the same dial duration bound applied for individual commands.
+		Expect(time.Since(start)).To(BeNumerically("<", 2*dialSimulatedDelay))
+	})
+})