forked from mirror/redis
143 lines
3.3 KiB
Go
143 lines
3.3 KiB
Go
package redis
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import (
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"context"
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"github.com/go-redis/redis/internal/pool"
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"github.com/go-redis/redis/internal/proto"
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)
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// TxFailedErr transaction redis failed.
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const TxFailedErr = proto.RedisError("redis: transaction failed")
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// Tx implements Redis transactions as described in
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// http://redis.io/topics/transactions. It's NOT safe for concurrent use
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// by multiple goroutines, because Exec resets list of watched keys.
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// If you don't need WATCH it is better to use Pipeline.
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type Tx struct {
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cmdable
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statefulCmdable
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baseClient
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ctx context.Context
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}
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func (c *Client) newTx() *Tx {
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tx := Tx{
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baseClient: baseClient{
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opt: c.opt,
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connPool: pool.NewStickyConnPool(c.connPool.(*pool.ConnPool), true),
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},
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ctx: c.ctx,
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}
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tx.init()
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return &tx
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}
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func (c *Tx) init() {
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c.cmdable = c.Process
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c.statefulCmdable = c.Process
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}
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func (c *Tx) Context() context.Context {
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return c.ctx
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}
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func (c *Tx) WithContext(ctx context.Context) *Tx {
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if ctx == nil {
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panic("nil context")
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}
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clone := *c
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clone.ctx = ctx
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return &clone
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}
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func (c *Tx) Process(cmd Cmder) error {
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return c.ProcessContext(c.ctx, cmd)
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}
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func (c *Tx) ProcessContext(ctx context.Context, cmd Cmder) error {
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return c.baseClient.process(ctx, cmd)
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}
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// Watch prepares a transaction and marks the keys to be watched
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// for conditional execution if there are any keys.
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//
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// The transaction is automatically closed when fn exits.
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func (c *Client) Watch(fn func(*Tx) error, keys ...string) error {
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tx := c.newTx()
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if len(keys) > 0 {
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if err := tx.Watch(keys...).Err(); err != nil {
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_ = tx.Close()
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return err
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}
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}
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err := fn(tx)
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_ = tx.Close()
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return err
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}
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// Close closes the transaction, releasing any open resources.
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func (c *Tx) Close() error {
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_ = c.Unwatch().Err()
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return c.baseClient.Close()
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}
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// Watch marks the keys to be watched for conditional execution
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// of a transaction.
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func (c *Tx) Watch(keys ...string) *StatusCmd {
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args := make([]interface{}, 1+len(keys))
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args[0] = "watch"
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for i, key := range keys {
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args[1+i] = key
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}
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cmd := NewStatusCmd(args...)
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_ = c.Process(cmd)
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return cmd
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}
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// Unwatch flushes all the previously watched keys for a transaction.
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func (c *Tx) Unwatch(keys ...string) *StatusCmd {
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args := make([]interface{}, 1+len(keys))
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args[0] = "unwatch"
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for i, key := range keys {
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args[1+i] = key
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}
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cmd := NewStatusCmd(args...)
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_ = c.Process(cmd)
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return cmd
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}
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// Pipeline creates a new pipeline. It is more convenient to use Pipelined.
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func (c *Tx) Pipeline() Pipeliner {
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pipe := Pipeline{
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ctx: c.ctx,
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exec: c.processTxPipeline,
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}
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pipe.init()
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return &pipe
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}
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// Pipelined executes commands queued in the fn in a transaction.
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//
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// When using WATCH, EXEC will execute commands only if the watched keys
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// were not modified, allowing for a check-and-set mechanism.
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//
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// Exec always returns list of commands. If transaction fails
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// TxFailedErr is returned. Otherwise Exec returns an error of the first
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// failed command or nil.
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func (c *Tx) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
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return c.Pipeline().Pipelined(fn)
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}
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// TxPipelined is an alias for Pipelined.
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func (c *Tx) TxPipelined(fn func(Pipeliner) error) ([]Cmder, error) {
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return c.Pipelined(fn)
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}
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// TxPipeline is an alias for Pipeline.
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func (c *Tx) TxPipeline() Pipeliner {
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return c.Pipeline()
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}
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