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pipeline.go
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pipeline.go
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package redis
import (
"sync"
"sync/atomic"
)
// Pipeline implements pipelining as described in
// http://redis.io/topics/pipelining. It's safe for concurrent use
// by multiple goroutines.
type Pipeline struct {
commandable
client *baseClient
mu sync.Mutex // protects cmds
cmds []Cmder
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)
pipe.mu.Unlock()
}
// Close closes the pipeline, releasing any open resources.
func (pipe *Pipeline) Close() error {
atomic.StoreInt32(&pipe.closed, 1)
pipe.Discard()
return nil
}
func (pipe *Pipeline) isClosed() bool {
return atomic.LoadInt32(&pipe.closed) == 1
}
// Discard resets the pipeline and discards queued commands.
func (pipe *Pipeline) Discard() error {
defer pipe.mu.Unlock()
pipe.mu.Lock()
if pipe.isClosed() {
return errClosed
}
pipe.cmds = pipe.cmds[:0]
return nil
}
// Exec executes all previously queued commands using one
// client-server roundtrip.
//
// Exec always returns list of commands and error of the first failed
// command if any.
func (pipe *Pipeline) Exec() (cmds []Cmder, retErr error) {
if pipe.isClosed() {
return nil, errClosed
}
defer pipe.mu.Unlock()
pipe.mu.Lock()
if len(pipe.cmds) == 0 {
return pipe.cmds, nil
}
cmds = pipe.cmds
pipe.cmds = make([]Cmder, 0, 10)
failedCmds := 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 {
resetCmds(failedCmds)
}
failedCmds, err = execCmds(cn, failedCmds)
pipe.client.putConn(cn, err)
if err != nil && retErr == nil {
retErr = err
}
if len(failedCmds) == 0 {
break
}
}
return cmds, retErr
}
func execCmds(cn *conn, cmds []Cmder) ([]Cmder, error) {
if err := cn.writeCmds(cmds...); err != nil {
setCmdsErr(cmds, err)
return cmds, err
}
var firstCmdErr error
var failedCmds []Cmder
for _, cmd := range cmds {
err := cmd.readReply(cn)
if err == nil {
continue
}
if firstCmdErr == nil {
firstCmdErr = err
}
if shouldRetry(err) {
failedCmds = append(failedCmds, cmd)
}
}
return failedCmds, firstCmdErr
}