Reuse single Pipeline type in Client, ClusterClient and Ring.

cluster.go

@@ -316,6 +316,92 @@ func (c *ClusterClient) reaper(frequency time.Duration) {
 	}
 }
 
+func (c *ClusterClient) Pipeline() *Pipeline {
+	pipe := &Pipeline{
+		exec: c.pipelineExec,
+	}
+	pipe.commandable.process = pipe.process
+	return pipe
+}
+
+func (c *ClusterClient) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
+	return c.Pipeline().pipelined(fn)
+}
+
+func (c *ClusterClient) pipelineExec(cmds []Cmder) error {
+	var retErr error
+
+	cmdsMap := make(map[string][]Cmder)
+	for _, cmd := range cmds {
+		slot := hashtag.Slot(cmd.clusterKey())
+		addr := c.slotMasterAddr(slot)
+		cmdsMap[addr] = append(cmdsMap[addr], cmd)
+	}
+
+	for attempt := 0; attempt <= c.opt.getMaxRedirects(); attempt++ {
+		failedCmds := make(map[string][]Cmder)
+
+		for addr, cmds := range cmdsMap {
+			client, err := c.getClient(addr)
+			if err != nil {
+				setCmdsErr(cmds, err)
+				retErr = err
+				continue
+			}
+
+			cn, err := client.conn()
+			if err != nil {
+				setCmdsErr(cmds, err)
+				retErr = err
+				continue
+			}
+
+			failedCmds, err = c.execClusterCmds(cn, cmds, failedCmds)
+			if err != nil {
+				retErr = err
+			}
+			client.putConn(cn, err, false)
+		}
+
+		cmdsMap = failedCmds
+	}
+
+	return retErr
+}
+
+func (c *ClusterClient) execClusterCmds(
+	cn *pool.Conn, cmds []Cmder, failedCmds map[string][]Cmder,
+) (map[string][]Cmder, error) {
+	if err := writeCmd(cn, cmds...); err != nil {
+		setCmdsErr(cmds, err)
+		return failedCmds, err
+	}
+
+	var firstCmdErr error
+	for i, cmd := range cmds {
+		err := cmd.readReply(cn)
+		if err == nil {
+			continue
+		}
+		if isNetworkError(err) {
+			cmd.reset()
+			failedCmds[""] = append(failedCmds[""], cmds[i:]...)
+			break
+		} else if moved, ask, addr := isMovedError(err); moved {
+			c.lazyReloadSlots()
+			cmd.reset()
+			failedCmds[addr] = append(failedCmds[addr], cmd)
+		} else if ask {
+			cmd.reset()
+			failedCmds[addr] = append(failedCmds[addr], NewCmd("ASKING"), cmd)
+		} else if firstCmdErr == nil {
+			firstCmdErr = err
+		}
+	}
+
+	return failedCmds, firstCmdErr
+}
+
 //------------------------------------------------------------------------------
 
 // ClusterOptions are used to configure a cluster client and should be

cluster_pipeline.go

@@ -1,140 +0,0 @@
-package redis
-
-import (
-	"gopkg.in/redis.v3/internal/hashtag"
-	"gopkg.in/redis.v3/internal/pool"
-)
-
-// ClusterPipeline is not thread-safe.
-type ClusterPipeline struct {
-	commandable
-
-	cluster *ClusterClient
-
-	cmds   []Cmder
-	closed bool
-}
-
-// Pipeline creates a new pipeline which is able to execute commands
-// against multiple shards. It's NOT safe for concurrent use by
-// multiple goroutines.
-func (c *ClusterClient) Pipeline() *ClusterPipeline {
-	pipe := &ClusterPipeline{
-		cluster: c,
-		cmds:    make([]Cmder, 0, 10),
-	}
-	pipe.commandable.process = pipe.process
-	return pipe
-}
-
-func (c *ClusterClient) Pipelined(fn func(*ClusterPipeline) error) ([]Cmder, error) {
-	pipe := c.Pipeline()
-	if err := fn(pipe); err != nil {
-		return nil, err
-	}
-	cmds, err := pipe.Exec()
-	_ = pipe.Close()
-	return cmds, err
-}
-
-func (pipe *ClusterPipeline) process(cmd Cmder) {
-	pipe.cmds = append(pipe.cmds, cmd)
-}
-
-// Discard resets the pipeline and discards queued commands.
-func (pipe *ClusterPipeline) Discard() error {
-	if pipe.closed {
-		return pool.ErrClosed
-	}
-	pipe.cmds = pipe.cmds[:0]
-	return nil
-}
-
-func (pipe *ClusterPipeline) Exec() (cmds []Cmder, retErr error) {
-	if pipe.closed {
-		return nil, pool.ErrClosed
-	}
-	if len(pipe.cmds) == 0 {
-		return []Cmder{}, nil
-	}
-
-	cmds = pipe.cmds
-	pipe.cmds = make([]Cmder, 0, 10)
-
-	cmdsMap := make(map[string][]Cmder)
-	for _, cmd := range cmds {
-		slot := hashtag.Slot(cmd.clusterKey())
-		addr := pipe.cluster.slotMasterAddr(slot)
-		cmdsMap[addr] = append(cmdsMap[addr], cmd)
-	}
-
-	for attempt := 0; attempt <= pipe.cluster.opt.getMaxRedirects(); attempt++ {
-		failedCmds := make(map[string][]Cmder)
-
-		for addr, cmds := range cmdsMap {
-			client, err := pipe.cluster.getClient(addr)
-			if err != nil {
-				setCmdsErr(cmds, err)
-				retErr = err
-				continue
-			}
-
-			cn, err := client.conn()
-			if err != nil {
-				setCmdsErr(cmds, err)
-				retErr = err
-				continue
-			}
-
-			failedCmds, err = pipe.execClusterCmds(cn, cmds, failedCmds)
-			if err != nil {
-				retErr = err
-			}
-			client.putConn(cn, err, false)
-		}
-
-		cmdsMap = failedCmds
-	}
-
-	return cmds, retErr
-}
-
-// Close closes the pipeline, releasing any open resources.
-func (pipe *ClusterPipeline) Close() error {
-	pipe.Discard()
-	pipe.closed = true
-	return nil
-}
-
-func (pipe *ClusterPipeline) execClusterCmds(
-	cn *pool.Conn, cmds []Cmder, failedCmds map[string][]Cmder,
-) (map[string][]Cmder, error) {
-	if err := writeCmd(cn, cmds...); err != nil {
-		setCmdsErr(cmds, err)
-		return failedCmds, err
-	}
-
-	var firstCmdErr error
-	for i, cmd := range cmds {
-		err := cmd.readReply(cn)
-		if err == nil {
-			continue
-		}
-		if isNetworkError(err) {
-			cmd.reset()
-			failedCmds[""] = append(failedCmds[""], cmds[i:]...)
-			break
-		} else if moved, ask, addr := isMovedError(err); moved {
-			pipe.cluster.lazyReloadSlots()
-			cmd.reset()
-			failedCmds[addr] = append(failedCmds[addr], cmd)
-		} else if ask {
-			cmd.reset()
-			failedCmds[addr] = append(failedCmds[addr], NewCmd("ASKING"), cmd)
-		} else if firstCmdErr == nil {
-			firstCmdErr = err
-		}
-	}
-
-	return failedCmds, firstCmdErr
-}

cluster_test.go

@@ -449,7 +449,7 @@ var _ = Describe("Cluster", func() {
 			Expect(client.Set("C", "C_value", 0).Err()).NotTo(HaveOccurred())
 
 			var a, b, c *redis.StringCmd
-			cmds, err := client.Pipelined(func(pipe *redis.ClusterPipeline) error {
+			cmds, err := client.Pipelined(func(pipe *redis.Pipeline) error {
 				a = pipe.Get("A")
 				b = pipe.Get("B")
 				c = pipe.Get("C")

pipeline.go

@@ -13,7 +13,7 @@ import (
 type Pipeline struct {
 	commandable
 
-	client baseClient
+	exec func([]Cmder) error
 
 	mu   sync.Mutex // protects cmds
 	cmds []Cmder
@@ -21,25 +21,6 @@ type Pipeline struct {
 	closed int32
 }
 
-func (c *Client) Pipeline() *Pipeline {
-	pipe := &Pipeline{
-		client: c.baseClient,
-		cmds:   make([]Cmder, 0, 10),
-	}
-	pipe.commandable.process = pipe.process
-	return pipe
-}
-
-func (c *Client) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
-	pipe := c.Pipeline()
-	if err := fn(pipe); err != nil {
-		return nil, err
-	}
-	cmds, err := pipe.Exec()
-	_ = pipe.Close()
-	return cmds, err
-}
-
 func (pipe *Pipeline) process(cmd Cmder) {
 	pipe.mu.Lock()
 	pipe.cmds = append(pipe.cmds, cmd)
@@ -73,7 +54,7 @@ func (pipe *Pipeline) Discard() error {
 //
 // Exec always returns list of commands and error of the first failed
 // command if any.
-func (pipe *Pipeline) Exec() (cmds []Cmder, retErr error) {
+func (pipe *Pipeline) Exec() ([]Cmder, error) {
 	if pipe.isClosed() {
 		return nil, pool.ErrClosed
 	}
@@ -85,31 +66,19 @@ func (pipe *Pipeline) Exec() (cmds []Cmder, retErr error) {
 		return pipe.cmds, nil
 	}
 
-	cmds = pipe.cmds
+	cmds := pipe.cmds
-	pipe.cmds = make([]Cmder, 0, 10)
+	pipe.cmds = nil
 
-	failedCmds := cmds
+	return cmds, pipe.exec(cmds)
-	for i := 0; i <= pipe.client.opt.MaxRetries; i++ {
+}
-		cn, err := pipe.client.conn()
-		if err != nil {
-			setCmdsErr(failedCmds, err)
-			return cmds, err
-		}
 
-		if i > 0 {
+func (pipe *Pipeline) pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
-			resetCmds(failedCmds)
+	if err := fn(pipe); err != nil {
-		}
+		return nil, err
-		failedCmds, err = execCmds(cn, failedCmds)
-		pipe.client.putConn(cn, err, false)
-		if err != nil && retErr == nil {
-			retErr = err
-		}
-		if len(failedCmds) == 0 {
-			break
-		}
 	}
-
+	cmds, err := pipe.Exec()
-	return cmds, retErr
+	_ = pipe.Close()
+	return cmds, err
 }
 
 func execCmds(cn *pool.Conn, cmds []Cmder) ([]Cmder, error) {

redis.go

@@ -174,3 +174,40 @@ func (c *Client) PoolStats() *PoolStats {
 		FreeConns:  s.FreeConns,
 	}
 }
+
+func (c *Client) Pipeline() *Pipeline {
+	pipe := &Pipeline{
+		exec: c.pipelineExec,
+	}
+	pipe.commandable.process = pipe.process
+	return pipe
+}
+
+func (c *Client) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
+	return c.Pipeline().pipelined(fn)
+}
+
+func (c *Client) pipelineExec(cmds []Cmder) error {
+	var retErr error
+	failedCmds := cmds
+	for i := 0; i <= c.opt.MaxRetries; i++ {
+		cn, err := c.conn()
+		if err != nil {
+			setCmdsErr(failedCmds, err)
+			return err
+		}
+
+		if i > 0 {
+			resetCmds(failedCmds)
+		}
+		failedCmds, err = execCmds(cn, failedCmds)
+		c.putConn(cn, err, false)
+		if err != nil && retErr == nil {
+			retErr = err
+		}
+		if len(failedCmds) == 0 {
+			break
+		}
+	}
+	return retErr
+}

ring.go

@@ -241,66 +241,24 @@ func (ring *Ring) Close() (retErr error) {
 	return retErr
 }
 
-// RingPipeline creates a new pipeline which is able to execute commands
+func (ring *Ring) Pipeline() *Pipeline {
-// against multiple shards. It's NOT safe for concurrent use by
+	pipe := &Pipeline{
-// multiple goroutines.
+		exec: ring.pipelineExec,
-type RingPipeline struct {
-	commandable
-
-	ring *Ring
-
-	cmds   []Cmder
-	closed bool
-}
-
-func (ring *Ring) Pipeline() *RingPipeline {
-	pipe := &RingPipeline{
-		ring: ring,
-		cmds: make([]Cmder, 0, 10),
 	}
 	pipe.commandable.process = pipe.process
 	return pipe
 }
 
-func (ring *Ring) Pipelined(fn func(*RingPipeline) error) ([]Cmder, error) {
+func (ring *Ring) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
-	pipe := ring.Pipeline()
+	return ring.Pipeline().pipelined(fn)
-	if err := fn(pipe); err != nil {
-		return nil, err
-	}
-	cmds, err := pipe.Exec()
-	pipe.Close()
-	return cmds, err
 }
 
-func (pipe *RingPipeline) process(cmd Cmder) {
+func (ring *Ring) pipelineExec(cmds []Cmder) error {
-	pipe.cmds = append(pipe.cmds, cmd)
+	var retErr error
-}
-
-// Discard resets the pipeline and discards queued commands.
-func (pipe *RingPipeline) Discard() error {
-	if pipe.closed {
-		return pool.ErrClosed
-	}
-	pipe.cmds = pipe.cmds[:0]
-	return nil
-}
-
-// Exec always returns list of commands and error of the first failed
-// command if any.
-func (pipe *RingPipeline) Exec() (cmds []Cmder, retErr error) {
-	if pipe.closed {
-		return nil, pool.ErrClosed
-	}
-	if len(pipe.cmds) == 0 {
-		return pipe.cmds, nil
-	}
-
-	cmds = pipe.cmds
-	pipe.cmds = make([]Cmder, 0, 10)
 
 	cmdsMap := make(map[string][]Cmder)
 	for _, cmd := range cmds {
-		name := pipe.ring.hash.Get(hashtag.Key(cmd.clusterKey()))
+		name := ring.hash.Get(hashtag.Key(cmd.clusterKey()))
 		if name == "" {
 			cmd.setErr(errRingShardsDown)
 			if retErr == nil {
@@ -311,11 +269,11 @@ func (pipe *RingPipeline) Exec() (cmds []Cmder, retErr error) {
 		cmdsMap[name] = append(cmdsMap[name], cmd)
 	}
 
-	for i := 0; i <= pipe.ring.opt.MaxRetries; i++ {
+	for i := 0; i <= ring.opt.MaxRetries; i++ {
 		failedCmdsMap := make(map[string][]Cmder)
 
 		for name, cmds := range cmdsMap {
-			client := pipe.ring.shards[name].Client
+			client := ring.shards[name].Client
 			cn, err := client.conn()
 			if err != nil {
 				setCmdsErr(cmds, err)
@@ -344,12 +302,5 @@ func (pipe *RingPipeline) Exec() (cmds []Cmder, retErr error) {
 		cmdsMap = failedCmdsMap
 	}
 
-	return cmds, retErr
+	return retErr
-}
-
-// Close closes the pipeline, releasing any open resources.
-func (pipe *RingPipeline) Close() error {
-	pipe.Discard()
-	pipe.closed = true
-	return nil
 }

ring_test.go

@@ -96,7 +96,7 @@ var _ = Describe("Redis ring", func() {
 	Describe("pipelining", func() {
 		It("returns an error when all shards are down", func() {
 			ring := redis.NewRing(&redis.RingOptions{})
-			_, err := ring.Pipelined(func(pipe *redis.RingPipeline) error {
+			_, err := ring.Pipelined(func(pipe *redis.Pipeline) error {
 				pipe.Ping()
 				return nil
 			})
@@ -133,7 +133,7 @@ var _ = Describe("Redis ring", func() {
 				keys = append(keys, string(key))
 			}
 
-			_, err := ring.Pipelined(func(pipe *redis.RingPipeline) error {
+			_, err := ring.Pipelined(func(pipe *redis.Pipeline) error {
 				for _, key := range keys {
 					pipe.Set(key, "value", 0).Err()
 				}
@@ -149,7 +149,7 @@ var _ = Describe("Redis ring", func() {
 		})
 
 		It("supports hash tags", func() {
-			_, err := ring.Pipelined(func(pipe *redis.RingPipeline) error {
+			_, err := ring.Pipelined(func(pipe *redis.Pipeline) error {
 				for i := 0; i < 100; i++ {
 					pipe.Set(fmt.Sprintf("key%d{tag}", i), "value", 0).Err()
 				}