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Merge pull request #403 from go-redis/fix/rewrite-tx-using-pipeline 

Refactor Tx using Pipeline to implement Cmdable interface.
This commit is contained in:
Vladimir Mihailenco 2016-10-13 14:59:25 +03:00 committed by GitHub
parent 3490ff5d21 20bc3ec5a6
commit 11137670ac
7 changed files with 52 additions and 69 deletions
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4
cluster_test.go
View File

@ -343,8 +343,8 @@ var _ = Describe("ClusterClient", func() {
return err
}
_, err = tx.MultiExec(func() error {
tx.Set(key, strconv.FormatInt(n+1, 10), 0)
_, err = tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Set(key, strconv.FormatInt(n+1, 10), 0)
return nil
})
return err

4
example_test.go
View File

@ -190,8 +190,8 @@ func ExampleClient_Watch() {
return err
}
_, err = tx.MultiExec(func() error {
tx.Set(key, strconv.FormatInt(n+1, 10), 0)
_, err = tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Set(key, strconv.FormatInt(n+1, 10), 0)
return nil
})
return err

6
pool_test.go
View File

@ -35,13 +35,13 @@ var _ = Describe("pool", func() {
Expect(pool.Len()).To(Equal(pool.FreeLen()))
})
It("srespect max size on multi", func() {
It("respects max size on multi", func() {
perform(1000, func(id int) {
var ping *redis.StatusCmd
err := client.Watch(func(tx *redis.Tx) error {
cmds, err := tx.MultiExec(func() error {
ping = tx.Ping()
cmds, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
ping = pipe.Ping()
return nil
})
Expect(err).NotTo(HaveOccurred())

4
race_test.go
View File

@ -222,8 +222,8 @@ var _ = Describe("races", func() {
num, err := strconv.ParseInt(val, 10, 64)
Expect(err).NotTo(HaveOccurred())
cmds, err := tx.MultiExec(func() error {
tx.Set("key", strconv.FormatInt(num+1, 10), 0)
cmds, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Set("key", strconv.FormatInt(num+1, 10), 0)
return nil
})
Expect(cmds).To(HaveLen(1))

4
redis_test.go
View File

@ -67,8 +67,8 @@ var _ = Describe("Client", func() {
It("should close Tx without closing the client", func() {
err := client.Watch(func(tx *redis.Tx) error {
_, err := tx.MultiExec(func() error {
tx.Ping()
_, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Ping()
return nil
})
return err

75
tx.go
View File

@ -11,8 +11,6 @@ import (
// Redis transaction failed.
const TxFailedErr = internal.RedisError("redis: transaction failed")
var errDiscard = internal.RedisError("redis: Discard can be used only inside Exec")
// 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.
@ -22,10 +20,11 @@ type Tx struct {
statefulCmdable
baseClient
cmds []Cmder
closed bool
}
var _ Cmdable = (*Tx)(nil)
func (c *Client) newTx() *Tx {
tx := Tx{
baseClient: baseClient{
@ -53,14 +52,6 @@ func (c *Client) Watch(fn func(*Tx) error, keys ...string) error {
return retErr
}
func (c *Tx) Process(cmd Cmder) error {
if c.cmds == nil {
return c.baseClient.Process(cmd)
}
c.cmds = append(c.cmds, cmd)
return nil
}
// close closes the transaction, releasing any open resources.
func (c *Tx) close() error {
if c.closed {
@ -98,16 +89,16 @@ func (c *Tx) Unwatch(keys ...string) *StatusCmd {
return cmd
}
// Discard discards queued commands.
func (c *Tx) Discard() error {
if c.cmds == nil {
return errDiscard
func (c *Tx) Pipeline() *Pipeline {
pipe := Pipeline{
exec: c.exec,
}
c.cmds = c.cmds[:1]
return nil
pipe.cmdable.process = pipe.Process
pipe.statefulCmdable.process = pipe.Process
return &pipe
}
// MultiExec executes all previously queued commands in a transaction
// 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
@ -116,36 +107,29 @@ func (c *Tx) Discard() error {
// 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) MultiExec(fn func() error) ([]Cmder, error) {
func (c *Tx) Pipelined(fn func(*Pipeline) error) ([]Cmder, error) {
return c.Pipeline().pipelined(fn)
}
func (c *Tx) exec(cmds []Cmder) error {
if c.closed {
return nil, pool.ErrClosed
return pool.ErrClosed
}
c.cmds = []Cmder{NewStatusCmd("MULTI")}
if err := fn(); err != nil {
return nil, err
}
c.cmds = append(c.cmds, NewSliceCmd("EXEC"))
cmds := c.cmds
c.cmds = nil
if len(cmds) == 2 {
return []Cmder{}, nil
}
// Strip MULTI and EXEC commands.
retCmds := cmds[1 : len(cmds)-1]
cn, _, err := c.conn()
if err != nil {
setCmdsErr(retCmds, err)
return retCmds, err
setCmdsErr(cmds, err)
return err
}
err = c.execCmds(cn, cmds)
multiExec := make([]Cmder, 0, len(cmds)+2)
multiExec = append(multiExec, NewStatusCmd("MULTI"))
multiExec = append(multiExec, cmds...)
multiExec = append(multiExec, NewSliceCmd("EXEC"))
err = c.execCmds(cn, multiExec)
c.putConn(cn, err, false)
return retCmds, err
return err
}
func (c *Tx) execCmds(cn *pool.Conn, cmds []Cmder) error {
@ -155,12 +139,11 @@ func (c *Tx) execCmds(cn *pool.Conn, cmds []Cmder) error {
return err
}
statusCmd := NewStatusCmd()
// Omit last command (EXEC).
cmdsLen := len(cmds) - 1
// Parse queued replies.
statusCmd := cmds[0]
for i := 0; i < cmdsLen; i++ {
if err := statusCmd.readReply(cn); err != nil {
setCmdsErr(cmds[1:len(cmds)-1], err)
@ -183,18 +166,18 @@ func (c *Tx) execCmds(cn *pool.Conn, cmds []Cmder) error {
return err
}
var firstCmdErr error
var firstErr error
// Parse replies.
// Loop starts from 1 to omit MULTI cmd.
for i := 1; i < cmdsLen; i++ {
cmd := cmds[i]
if err := cmd.readReply(cn); err != nil {
if firstCmdErr == nil {
firstCmdErr = err
if firstErr == nil {
firstErr = err
}
}
}
return firstCmdErr
return firstErr
}

24
tx_test.go
View File

@ -33,8 +33,8 @@ var _ = Describe("Tx", func() {
return err
}
_, err = tx.MultiExec(func() error {
tx.Set(key, strconv.FormatInt(n+1, 10), 0)
_, err = tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Set(key, strconv.FormatInt(n+1, 10), 0)
return nil
})
return err
@ -65,10 +65,10 @@ var _ = Describe("Tx", func() {
It("should discard", func() {
err := client.Watch(func(tx *redis.Tx) error {
cmds, err := tx.MultiExec(func() error {
tx.Set("key1", "hello1", 0)
tx.Discard()
tx.Set("key2", "hello2", 0)
cmds, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Set("key1", "hello1", 0)
pipe.Discard()
pipe.Set("key2", "hello2", 0)
return nil
})
Expect(err).NotTo(HaveOccurred())
@ -88,7 +88,7 @@ var _ = Describe("Tx", func() {
It("should exec empty", func() {
err := client.Watch(func(tx *redis.Tx) error {
cmds, err := tx.MultiExec(func() error { return nil })
cmds, err := tx.Pipelined(func(*redis.Pipeline) error { return nil })
Expect(err).NotTo(HaveOccurred())
Expect(cmds).To(HaveLen(0))
return err
@ -104,9 +104,9 @@ var _ = Describe("Tx", func() {
const N = 20000
err := client.Watch(func(tx *redis.Tx) error {
cmds, err := tx.MultiExec(func() error {
cmds, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
for i := 0; i < N; i++ {
tx.Incr("key")
pipe.Incr("key")
}
return nil
})
@ -135,8 +135,8 @@ var _ = Describe("Tx", func() {
do := func() error {
err := client.Watch(func(tx *redis.Tx) error {
_, err := tx.MultiExec(func() error {
tx.Ping()
_, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
pipe.Ping()
return nil
})
return err
@ -162,7 +162,7 @@ var _ = Describe("Tx", func() {
do := func() error {
err := client.Watch(func(tx *redis.Tx) error {
_, err := tx.MultiExec(func() error {
_, err := tx.Pipelined(func(pipe *redis.Pipeline) error {
return nil
})
return err