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Diffstat (limited to '')
-rw-r--r-- | dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/pipeline.go | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/pipeline.go b/dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/pipeline.go new file mode 100644 index 0000000..31bab97 --- /dev/null +++ b/dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/pipeline.go @@ -0,0 +1,147 @@ +package redis + +import ( + "context" + "sync" + + "github.com/go-redis/redis/v8/internal/pool" +) + +type pipelineExecer func(context.Context, []Cmder) error + +// Pipeliner is an mechanism to realise Redis Pipeline technique. +// +// Pipelining is a technique to extremely speed up processing by packing +// operations to batches, send them at once to Redis and read a replies in a +// singe step. +// See https://redis.io/topics/pipelining +// +// Pay attention, that Pipeline is not a transaction, so you can get unexpected +// results in case of big pipelines and small read/write timeouts. +// Redis client has retransmission logic in case of timeouts, pipeline +// can be retransmitted and commands can be executed more then once. +// To avoid this: it is good idea to use reasonable bigger read/write timeouts +// depends of your batch size and/or use TxPipeline. +type Pipeliner interface { + StatefulCmdable + Len() int + Do(ctx context.Context, args ...interface{}) *Cmd + Process(ctx context.Context, cmd Cmder) error + Close() error + Discard() error + Exec(ctx context.Context) ([]Cmder, error) +} + +var _ Pipeliner = (*Pipeline)(nil) + +// Pipeline implements pipelining as described in +// http://redis.io/topics/pipelining. It's safe for concurrent use +// by multiple goroutines. +type Pipeline struct { + cmdable + statefulCmdable + + ctx context.Context + exec pipelineExecer + + mu sync.Mutex + cmds []Cmder + closed bool +} + +func (c *Pipeline) init() { + c.cmdable = c.Process + c.statefulCmdable = c.Process +} + +// Len returns the number of queued commands. +func (c *Pipeline) Len() int { + c.mu.Lock() + ln := len(c.cmds) + c.mu.Unlock() + return ln +} + +// Do queues the custom command for later execution. +func (c *Pipeline) Do(ctx context.Context, args ...interface{}) *Cmd { + cmd := NewCmd(ctx, args...) + _ = c.Process(ctx, cmd) + return cmd +} + +// Process queues the cmd for later execution. +func (c *Pipeline) Process(ctx context.Context, cmd Cmder) error { + c.mu.Lock() + c.cmds = append(c.cmds, cmd) + c.mu.Unlock() + return nil +} + +// Close closes the pipeline, releasing any open resources. +func (c *Pipeline) Close() error { + c.mu.Lock() + _ = c.discard() + c.closed = true + c.mu.Unlock() + return nil +} + +// Discard resets the pipeline and discards queued commands. +func (c *Pipeline) Discard() error { + c.mu.Lock() + err := c.discard() + c.mu.Unlock() + return err +} + +func (c *Pipeline) discard() error { + if c.closed { + return pool.ErrClosed + } + c.cmds = c.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 (c *Pipeline) Exec(ctx context.Context) ([]Cmder, error) { + c.mu.Lock() + defer c.mu.Unlock() + + if c.closed { + return nil, pool.ErrClosed + } + + if len(c.cmds) == 0 { + return nil, nil + } + + cmds := c.cmds + c.cmds = nil + + return cmds, c.exec(ctx, cmds) +} + +func (c *Pipeline) Pipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) { + if err := fn(c); err != nil { + return nil, err + } + cmds, err := c.Exec(ctx) + _ = c.Close() + return cmds, err +} + +func (c *Pipeline) Pipeline() Pipeliner { + return c +} + +func (c *Pipeline) TxPipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) { + return c.Pipelined(ctx, fn) +} + +func (c *Pipeline) TxPipeline() Pipeliner { + return c +} |