mirror of https://github.com/go-redis/redis.git
102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
package redis
|
|
|
|
import (
|
|
"gopkg.in/redis.v5/internal"
|
|
"gopkg.in/redis.v5/internal/pool"
|
|
)
|
|
|
|
// Redis transaction failed.
|
|
const TxFailedErr = internal.RedisError("redis: transaction failed")
|
|
|
|
// Tx implements Redis transactions as described in
|
|
// http://redis.io/topics/transactions. It's NOT safe for concurrent use
|
|
// by multiple goroutines, because Exec resets list of watched keys.
|
|
// If you don't need WATCH it is better to use Pipeline.
|
|
type Tx struct {
|
|
cmdable
|
|
statefulCmdable
|
|
baseClient
|
|
}
|
|
|
|
var _ Cmdable = (*Tx)(nil)
|
|
|
|
func (c *Client) newTx() *Tx {
|
|
tx := Tx{
|
|
baseClient: baseClient{
|
|
opt: c.opt,
|
|
connPool: pool.NewStickyConnPool(c.connPool.(*pool.ConnPool), true),
|
|
},
|
|
}
|
|
tx.cmdable.process = tx.Process
|
|
tx.statefulCmdable.process = tx.Process
|
|
return &tx
|
|
}
|
|
|
|
func (c *Client) Watch(fn func(*Tx) error, keys ...string) error {
|
|
tx := c.newTx()
|
|
if len(keys) > 0 {
|
|
if err := tx.Watch(keys...).Err(); err != nil {
|
|
_ = tx.Close()
|
|
return err
|
|
}
|
|
}
|
|
firstErr := fn(tx)
|
|
if err := tx.Close(); err != nil && firstErr == nil {
|
|
firstErr = err
|
|
}
|
|
return firstErr
|
|
}
|
|
|
|
// close closes the transaction, releasing any open resources.
|
|
func (c *Tx) Close() error {
|
|
_ = c.Unwatch().Err()
|
|
return c.baseClient.Close()
|
|
}
|
|
|
|
// Watch marks the keys to be watched for conditional execution
|
|
// of a transaction.
|
|
func (c *Tx) Watch(keys ...string) *StatusCmd {
|
|
args := make([]interface{}, 1+len(keys))
|
|
args[0] = "WATCH"
|
|
for i, key := range keys {
|
|
args[1+i] = key
|
|
}
|
|
cmd := NewStatusCmd(args...)
|
|
c.Process(cmd)
|
|
return cmd
|
|
}
|
|
|
|
// Unwatch flushes all the previously watched keys for a transaction.
|
|
func (c *Tx) Unwatch(keys ...string) *StatusCmd {
|
|
args := make([]interface{}, 1+len(keys))
|
|
args[0] = "UNWATCH"
|
|
for i, key := range keys {
|
|
args[1+i] = key
|
|
}
|
|
cmd := NewStatusCmd(args...)
|
|
c.Process(cmd)
|
|
return cmd
|
|
}
|
|
|
|
func (c *Tx) Pipeline() *Pipeline {
|
|
pipe := Pipeline{
|
|
exec: c.pipelineExecer(c.txPipelineProcessCmds),
|
|
}
|
|
pipe.cmdable.process = pipe.Process
|
|
pipe.statefulCmdable.process = pipe.Process
|
|
return &pipe
|
|
}
|
|
|
|
// Pipelined executes commands queued in the fn in a transaction
|
|
// and restores the connection state to normal.
|
|
//
|
|
// When using WATCH, EXEC will execute commands only if the watched keys
|
|
// were not modified, allowing for a check-and-set mechanism.
|
|
//
|
|
// Exec always returns list of commands. If transaction fails
|
|
// TxFailedErr is returned. Otherwise Exec returns error of the first
|
|
// failed command or nil.
|
|
func (c *Tx) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
|
|
return c.Pipeline().pipelined(fn)
|
|
}
|