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Merge pull request #296 from go-redis/feature/single-pipeline-type 

Reuse single Pipeline type in Client, ClusterClient and Ring.
This commit is contained in:
Vladimir Mihailenco 2016-04-09 11:22:29 +03:00
parent b351402995 3b051d2374
commit 8ca5674bd1
7 changed files with 150 additions and 247 deletions
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86
cluster.go
View File

@ -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

140
cluster_pipeline.go
View File

@ -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
}

2
cluster_test.go
View File

@ -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")

57
pipeline.go
View File

@ -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
}
@ -85,33 +66,21 @@ func (pipe *Pipeline) Exec() (cmds []Cmder, retErr error) {
return pipe.cmds, nil
}
cmds = pipe.cmds
pipe.cmds = make([]Cmder, 0, 10)
cmds := pipe.cmds
pipe.cmds = nil
failedCmds := cmds
for i := 0; i <= pipe.client.opt.MaxRetries; i++ {
cn, err := pipe.client.conn()
if err != nil {
setCmdsErr(failedCmds, err)
return cmds, pipe.exec(cmds)
}
func (pipe *Pipeline) pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
if err := fn(pipe); err != nil {
return nil, err
}
cmds, err := pipe.Exec()
_ = pipe.Close()
return cmds, err
}
if i > 0 {
resetCmds(failedCmds)
}
failedCmds, err = execCmds(cn, failedCmds)
pipe.client.putConn(cn, err, false)
if err != nil && retErr == nil {
retErr = err
}
if len(failedCmds) == 0 {
break
}
}
return cmds, retErr
}
func execCmds(cn *pool.Conn, cmds []Cmder) ([]Cmder, error) {
if err := writeCmd(cn, cmds...); err != nil {
setCmdsErr(cmds, err)

37
redis.go
View File

@ -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
}

71
ring.go
View File

@ -241,66 +241,24 @@ func (ring *Ring) Close() (retErr error) {
return retErr
}
// RingPipeline creates a new pipeline which is able to execute commands
// against multiple shards. It's NOT safe for concurrent use by
// multiple goroutines.
type RingPipeline struct {
commandable
ring *Ring
cmds []Cmder
closed bool
}
func (ring *Ring) Pipeline() *RingPipeline {
pipe := &RingPipeline{
ring: ring,
cmds: make([]Cmder, 0, 10),
func (ring *Ring) Pipeline() *Pipeline {
pipe := &Pipeline{
exec: ring.pipelineExec,
}
pipe.commandable.process = pipe.process
return pipe
}
func (ring *Ring) Pipelined(fn func(*RingPipeline) error) ([]Cmder, error) {
pipe := ring.Pipeline()
if err := fn(pipe); err != nil {
return nil, err
}
cmds, err := pipe.Exec()
pipe.Close()
return cmds, err
func (ring *Ring) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
return ring.Pipeline().pipelined(fn)
}
func (pipe *RingPipeline) process(cmd Cmder) {
pipe.cmds = append(pipe.cmds, cmd)
}
// 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)
func (ring *Ring) pipelineExec(cmds []Cmder) error {
var retErr error
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
}
// Close closes the pipeline, releasing any open resources.
func (pipe *RingPipeline) Close() error {
pipe.Discard()
pipe.closed = true
return nil
return retErr
}

6
ring_test.go
View File

@ -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()
}