forked from mirror/redis
108 lines
1.9 KiB
Go
108 lines
1.9 KiB
Go
package redis
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import (
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"errors"
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"sync"
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"github.com/go-redis/redis/internal/pool"
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)
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type pipelineExecer func([]Cmder) error
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type Pipeliner interface {
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StatefulCmdable
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Process(cmd Cmder) error
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Close() error
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Discard() error
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discard() error
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Exec() ([]Cmder, error)
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pipelined(fn func(Pipeliner) error) ([]Cmder, error)
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}
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var _ Pipeliner = (*Pipeline)(nil)
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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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statefulCmdable
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exec pipelineExecer
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mu sync.Mutex
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cmds []Cmder
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closed bool
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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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c.mu.Lock()
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c.discard()
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c.closed = true
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c.mu.Unlock()
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return nil
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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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c.mu.Lock()
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err := c.discard()
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c.mu.Unlock()
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return err
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}
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func (c *Pipeline) discard() error {
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if c.closed {
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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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c.mu.Lock()
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defer c.mu.Unlock()
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if c.closed {
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return nil, pool.ErrClosed
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}
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if len(c.cmds) == 0 {
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return nil, errors.New("redis: pipeline is empty")
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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(Pipeliner) 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 (c *Pipeline) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
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return c.pipelined(fn)
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}
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func (c *Pipeline) Pipeline() Pipeliner {
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return c
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}
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