mirror of https://github.com/go-redis/redis.git
107 lines
1.9 KiB
Go
107 lines
1.9 KiB
Go
package redis
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import (
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"sync"
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"sync/atomic"
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"gopkg.in/redis.v5/internal"
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"gopkg.in/redis.v5/internal/pool"
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)
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// Pipeline implements pipelining as described in
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// http://redis.io/topics/pipelining. It's safe for concurrent use
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// by multiple goroutines.
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type Pipeline struct {
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cmdable
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statefulCmdable
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exec func([]Cmder) error
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mu sync.Mutex // protects cmds
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cmds []Cmder
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closed int32
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}
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func (c *Pipeline) Process(cmd Cmder) error {
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c.mu.Lock()
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c.cmds = append(c.cmds, cmd)
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c.mu.Unlock()
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return nil
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}
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// Close closes the pipeline, releasing any open resources.
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func (c *Pipeline) Close() error {
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atomic.StoreInt32(&c.closed, 1)
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c.Discard()
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return nil
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}
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func (c *Pipeline) isClosed() bool {
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return atomic.LoadInt32(&c.closed) == 1
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}
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// Discard resets the pipeline and discards queued commands.
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func (c *Pipeline) Discard() error {
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defer c.mu.Unlock()
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c.mu.Lock()
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if c.isClosed() {
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return pool.ErrClosed
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}
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c.cmds = c.cmds[:0]
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return nil
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}
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// Exec executes all previously queued commands using one
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// client-server roundtrip.
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//
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// Exec always returns list of commands and error of the first failed
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// command if any.
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func (c *Pipeline) Exec() ([]Cmder, error) {
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if c.isClosed() {
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return nil, pool.ErrClosed
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}
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defer c.mu.Unlock()
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c.mu.Lock()
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if len(c.cmds) == 0 {
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return c.cmds, nil
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}
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cmds := c.cmds
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c.cmds = nil
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return cmds, c.exec(cmds)
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}
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func (c *Pipeline) pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
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if err := fn(c); err != nil {
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return nil, err
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}
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cmds, err := c.Exec()
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_ = c.Close()
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return cmds, err
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}
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func execCmds(cn *pool.Conn, cmds []Cmder) (retry bool, firstErr error) {
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if err := writeCmd(cn, cmds...); err != nil {
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setCmdsErr(cmds, err)
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return true, err
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}
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for i, cmd := range cmds {
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err := cmd.readReply(cn)
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if err == nil {
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continue
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}
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if i == 0 && internal.IsNetworkError(err) {
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return true, err
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}
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if firstErr == nil {
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firstErr = err
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}
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}
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return false, firstErr
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}
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