Small API changes.

v2/example_test.go

@@ -55,32 +55,32 @@ func ExamplePipeline() {
 
 	var set *redis.StatusReq
 	var get *redis.StringReq
-	reqs, err := client.Pipelined(func(c *redis.PipelineClient) {
+	reqs, err := client.Pipelined(func(c *redis.Pipeline) {
 		set = c.Set("key1", "hello1")
 		get = c.Get("key2")
 	})
 	fmt.Println(err, reqs)
 	fmt.Println(set)
 	fmt.Println(get)
-	// Output: <nil> [SET key1 hello1: OK GET key2: (nil)]
+	// Output: (nil) [SET key1 hello1: OK GET key2: (nil)]
 	// SET key1 hello1: OK
 	// GET key2: (nil)
 }
 
-func transaction(multi *redis.MultiClient) ([]redis.Req, error) {
+func incr(tx *redis.Multi) ([]redis.Req, error) {
-	get := multi.Get("key")
+	get := tx.Get("key")
 	if err := get.Err(); err != nil && err != redis.Nil {
 		return nil, err
 	}
 
 	val, _ := strconv.ParseInt(get.Val(), 10, 64)
 
-	reqs, err := multi.Exec(func() {
+	reqs, err := tx.Exec(func() {
-		multi.Set("key", strconv.FormatInt(val+1, 10))
+		tx.Set("key", strconv.FormatInt(val+1, 10))
 	})
 	// Transaction failed. Repeat.
 	if err == redis.Nil {
-		return transaction(multi)
+		return incr(tx)
 	}
 	return reqs, err
 }
@@ -93,14 +93,13 @@ func ExampleTransaction() {
 
 	client.Del("key")
 
-	multi, err := client.MultiClient()
+	tx := client.Multi()
-	_ = err
+	defer tx.Close()
-	defer multi.Close()
 
-	watch := multi.Watch("key")
+	watch := tx.Watch("key")
 	_ = watch.Err()
 
-	reqs, err := transaction(multi)
+	reqs, err := incr(tx)
 	fmt.Println(err, reqs)
 
 	// Output: <nil> [SET key 1: OK]

v2/multi.go

@@ -1,67 +1,62 @@
 package redis
 
 import (
+	"errors"
 	"fmt"
-	"sync"
 )
 
-type MultiClient struct {
+var errDiscard = errors.New("redis: Discard can be used only inside Exec")
+
+// Not thread-safe.
+type Multi struct {
 	*Client
-	execMtx sync.Mutex
 }
 
-func (c *Client) MultiClient() (*MultiClient, error) {
+func (c *Client) Multi() *Multi {
-	return &MultiClient{
+	return &Multi{
 		Client: &Client{
 			baseClient: &baseClient{
 				opt:      c.opt,
 				connPool: newSingleConnPool(c.connPool, nil, true),
 			},
 		},
-	}, nil
+	}
 }
 
-func (c *MultiClient) Close() error {
+func (c *Multi) Close() error {
 	c.Unwatch()
 	return c.Client.Close()
 }
 
-func (c *MultiClient) Watch(keys ...string) *StatusReq {
+func (c *Multi) Watch(keys ...string) *StatusReq {
 	args := append([]string{"WATCH"}, keys...)
 	req := NewStatusReq(args...)
 	c.Process(req)
 	return req
 }
 
-func (c *MultiClient) Unwatch(keys ...string) *StatusReq {
+func (c *Multi) Unwatch(keys ...string) *StatusReq {
 	args := append([]string{"UNWATCH"}, keys...)
 	req := NewStatusReq(args...)
 	c.Process(req)
 	return req
 }
 
-func (c *MultiClient) Discard() {
+func (c *Multi) Discard() error {
-	c.reqsMtx.Lock()
 	if c.reqs == nil {
-		panic("Discard can be used only inside Exec")
+		return errDiscard
 	}
 	c.reqs = c.reqs[:1]
-	c.reqsMtx.Unlock()
+	return nil
 }
 
-func (c *MultiClient) Exec(do func()) ([]Req, error) {
+func (c *Multi) Exec(f func()) ([]Req, error) {
-	c.reqsMtx.Lock()
 	c.reqs = []Req{NewStatusReq("MULTI")}
-	c.reqsMtx.Unlock()
+	f()
+	c.reqs = append(c.reqs, NewIfaceSliceReq("EXEC"))
 
-	do()
-
-	c.queue(NewIfaceSliceReq("EXEC"))
-
-	c.reqsMtx.Lock()
 	reqs := c.reqs
 	c.reqs = nil
-	c.reqsMtx.Unlock()
 
 	if len(reqs) == 2 {
 		return []Req{}, nil
@@ -73,9 +68,7 @@ func (c *MultiClient) Exec(do func()) ([]Req, error) {
 	}
 
 	// Synchronize writes and reads to the connection using mutex.
-	c.execMtx.Lock()
 	err = c.execReqs(reqs, cn)
-	c.execMtx.Unlock()
 	if err != nil {
 		c.removeConn(cn)
 		return nil, err
@@ -85,7 +78,7 @@ func (c *MultiClient) Exec(do func()) ([]Req, error) {
 	return reqs[1 : len(reqs)-1], nil
 }
 
-func (c *MultiClient) execReqs(reqs []Req, cn *conn) error {
+func (c *Multi) execReqs(reqs []Req, cn *conn) error {
 	err := c.writeReq(cn, reqs...)
 	if err != nil {
 		return err
@@ -110,7 +103,7 @@ func (c *MultiClient) execReqs(reqs []Req, cn *conn) error {
 		return err
 	}
 	if line[0] != '*' {
-		return fmt.Errorf("Expected '*', but got line %q", line)
+		return fmt.Errorf("redis: expected '*', but got line %q", line)
 	}
 	if len(line) == 3 && line[1] == '-' && line[2] == '1' {
 		return Nil

v2/pipeline.go

@@ -1,13 +1,12 @@
 package redis
 
-type PipelineClient struct {
+// Not thread-safe.
+type Pipeline struct {
 	*Client
 }
 
-// TODO: rename to Pipeline
+func (c *Client) Pipeline() *Pipeline {
-// TODO: return just *PipelineClient
+	return &Pipeline{
-func (c *Client) PipelineClient() (*PipelineClient, error) {
-	return &PipelineClient{
 		Client: &Client{
 			baseClient: &baseClient{
 				opt:      c.opt,
@@ -16,38 +15,31 @@ func (c *Client) PipelineClient() (*PipelineClient, error) {
 				reqs: make([]Req, 0),
 			},
 		},
-	}, nil
-}
-
-func (c *Client) Pipelined(do func(*PipelineClient)) ([]Req, error) {
-	pc, err := c.PipelineClient()
-	if err != nil {
-		return nil, err
 	}
-	defer pc.Close()
-
-	do(pc)
-
-	return pc.RunQueued()
 }
 
-func (c *PipelineClient) Close() error {
+func (c *Client) Pipelined(f func(*Pipeline)) ([]Req, error) {
+	pc := c.Pipeline()
+	f(pc)
+	reqs, err := pc.Exec()
+	pc.Close()
+	return reqs, err
+}
+
+func (c *Pipeline) Close() error {
 	return nil
 }
 
-func (c *PipelineClient) DiscardQueued() {
+func (c *Pipeline) Discard() error {
-	c.reqsMtx.Lock()
 	c.reqs = c.reqs[:0]
-	c.reqsMtx.Unlock()
+	return nil
 }
 
-// TODO: rename to Run or ...
+// Always returns list of commands and error of the first failed
-// TODO: should return error if one of the commands failed
+// command if any.
-func (c *PipelineClient) RunQueued() ([]Req, error) {
+func (c *Pipeline) Exec() ([]Req, error) {
-	c.reqsMtx.Lock()
 	reqs := c.reqs
 	c.reqs = make([]Req, 0)
-	c.reqsMtx.Unlock()
 
 	if len(reqs) == 0 {
 		return []Req{}, nil
@@ -55,34 +47,39 @@ func (c *PipelineClient) RunQueued() ([]Req, error) {
 
 	cn, err := c.conn()
 	if err != nil {
-		return nil, err
+		return reqs, err
 	}
 
-	if err := c.runReqs(reqs, cn); err != nil {
+	if err := c.execReqs(reqs, cn); err != nil {
-		c.removeConn(cn)
+		c.freeConn(cn, err)
-		return nil, err
+		return reqs, err
 	}
 
 	c.putConn(cn)
 	return reqs, nil
 }
 
-func (c *PipelineClient) runReqs(reqs []Req, cn *conn) error {
+func (c *Pipeline) execReqs(reqs []Req, cn *conn) error {
 	err := c.writeReq(cn, reqs...)
 	if err != nil {
+		for _, req := range reqs {
+			req.SetErr(err)
+		}
 		return err
 	}
 
-	reqsLen := len(reqs)
+	var firstReqErr error
-	for i := 0; i < reqsLen; i++ {
+	for _, req := range reqs {
-		req := reqs[i]
 		val, err := req.ParseReply(cn.Rd)
 		if err != nil {
 			req.SetErr(err)
+			if err != nil {
+				firstReqErr = err
+			}
 		} else {
 			req.SetVal(val)
 		}
 	}
 
-	return nil
+	return firstReqErr
 }

v2/redis.go

@@ -5,7 +5,6 @@ import (
 	"log"
 	"net"
 	"os"
-	"sync"
 	"time"
 )
 
@@ -19,8 +18,7 @@ type baseClient struct {
 
 	opt *Options
 
-	reqs    []Req
+	reqs []Req
-	reqsMtx sync.Mutex
 }
 
 func (c *baseClient) writeReq(cn *conn, reqs ...Req) error {
@@ -75,6 +73,14 @@ func (c *baseClient) init(cn *conn, password string, db int64) error {
 	return nil
 }
 
+func (c *baseClient) freeConn(cn *conn, err error) {
+	if err == Nil {
+		c.putConn(cn)
+	} else {
+		c.removeConn(cn)
+	}
+}
+
 func (c *baseClient) removeConn(cn *conn) {
 	if err := c.connPool.Remove(cn); err != nil {
 		Logger.Printf("connPool.Remove error: %v", err)
@@ -91,7 +97,7 @@ func (c *baseClient) Process(req Req) {
 	if c.reqs == nil {
 		c.run(req)
 	} else {
-		c.queue(req)
+		c.reqs = append(c.reqs, req)
 	}
 }
 
@@ -120,11 +126,7 @@ func (c *baseClient) run(req Req) {
 
 	val, err := req.ParseReply(cn.Rd)
 	if err != nil {
-		if err == Nil {
+		c.freeConn(cn, err)
-			c.putConn(cn)
-		} else {
-			c.removeConn(cn)
-		}
 		req.SetErr(err)
 		return
 	}
@@ -133,13 +135,6 @@ func (c *baseClient) run(req Req) {
 	req.SetVal(val)
 }
 
-// Queues request to be executed later.
-func (c *baseClient) queue(req Req) {
-	c.reqsMtx.Lock()
-	c.reqs = append(c.reqs, req)
-	c.reqsMtx.Unlock()
-}
-
 func (c *baseClient) Close() error {
 	return c.connPool.Close()
 }

v2/redis_test.go

@@ -2393,8 +2393,7 @@ func (t *RedisTest) TestPipeline(c *C) {
 	c.Assert(set.Err(), IsNil)
 	c.Assert(set.Val(), Equals, "OK")
 
-	pipeline, err := t.client.PipelineClient()
+	pipeline := t.client.Pipeline()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(pipeline.Close(), IsNil)
 	}()
@@ -2404,8 +2403,8 @@ func (t *RedisTest) TestPipeline(c *C) {
 	incr := pipeline.Incr("key3")
 	getNil := pipeline.Get("key4")
 
-	reqs, err := pipeline.RunQueued()
+	reqs, err := pipeline.Exec()
-	c.Assert(err, IsNil)
+	c.Assert(err, Equals, redis.Nil)
 	c.Assert(reqs, HasLen, 4)
 
 	c.Assert(set.Err(), IsNil)
@@ -2422,33 +2421,31 @@ func (t *RedisTest) TestPipeline(c *C) {
 }
 
 func (t *RedisTest) TestPipelineDiscardQueued(c *C) {
-	pipeline, err := t.client.PipelineClient()
+	pipeline := t.client.Pipeline()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(pipeline.Close(), IsNil)
 	}()
 
 	pipeline.Get("key")
-	pipeline.DiscardQueued()
+	pipeline.Discard()
-	reqs, err := pipeline.RunQueued()
+	reqs, err := pipeline.Exec()
 	c.Assert(err, IsNil)
 	c.Assert(reqs, HasLen, 0)
 }
 
 func (t *RedisTest) TestPipelineFunc(c *C) {
 	var get *redis.StringReq
-	reqs, err := t.client.Pipelined(func(c *redis.PipelineClient) {
+	reqs, err := t.client.Pipelined(func(c *redis.Pipeline) {
 		get = c.Get("foo")
 	})
-	c.Assert(err, IsNil)
+	c.Assert(err, Equals, redis.Nil)
 	c.Assert(reqs, HasLen, 1)
 	c.Assert(get.Err(), Equals, redis.Nil)
 	c.Assert(get.Val(), Equals, "")
 }
 
 func (t *RedisTest) TestPipelineErrValNotSet(c *C) {
-	pipeline, err := t.client.PipelineClient()
+	pipeline := t.client.Pipeline()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(pipeline.Close(), IsNil)
 	}()
@@ -2458,20 +2455,18 @@ func (t *RedisTest) TestPipelineErrValNotSet(c *C) {
 }
 
 func (t *RedisTest) TestPipelineRunQueuedOnEmptyQueue(c *C) {
-	pipeline, err := t.client.PipelineClient()
+	pipeline := t.client.Pipeline()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(pipeline.Close(), IsNil)
 	}()
 
-	reqs, err := pipeline.RunQueued()
+	reqs, err := pipeline.Exec()
 	c.Assert(err, IsNil)
 	c.Assert(reqs, HasLen, 0)
 }
 
 func (t *RedisTest) TestPipelineIncrFromGoroutines(c *C) {
-	pipeline, err := t.client.PipelineClient()
+	pipeline := t.client.Pipeline()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(pipeline.Close(), IsNil)
 	}()
@@ -2486,7 +2481,7 @@ func (t *RedisTest) TestPipelineIncrFromGoroutines(c *C) {
 	}
 	wg.Wait()
 
-	reqs, err := pipeline.RunQueued()
+	reqs, err := pipeline.Exec()
 	c.Assert(err, IsNil)
 	c.Assert(reqs, HasLen, 20000)
 	for _, req := range reqs {
@@ -2501,8 +2496,7 @@ func (t *RedisTest) TestPipelineIncrFromGoroutines(c *C) {
 }
 
 func (t *RedisTest) TestPipelineEchoFromGoroutines(c *C) {
-	pipeline, err := t.client.PipelineClient()
+	pipeline := t.client.Pipeline()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(pipeline.Close(), IsNil)
 	}()
@@ -2517,7 +2511,7 @@ func (t *RedisTest) TestPipelineEchoFromGoroutines(c *C) {
 			echo1 := pipeline.Echo(msg1)
 			echo2 := pipeline.Echo(msg2)
 
-			reqs, err := pipeline.RunQueued()
+			reqs, err := pipeline.Exec()
 			c.Assert(err, IsNil)
 			c.Assert(reqs, HasLen, 2)
 
@@ -2536,8 +2530,7 @@ func (t *RedisTest) TestPipelineEchoFromGoroutines(c *C) {
 //------------------------------------------------------------------------------
 
 func (t *RedisTest) TestMultiExec(c *C) {
-	multi, err := t.client.MultiClient()
+	multi := t.client.Multi()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()
@@ -2561,8 +2554,7 @@ func (t *RedisTest) TestMultiExec(c *C) {
 }
 
 func (t *RedisTest) TestMultiExecDiscard(c *C) {
-	multi, err := t.client.MultiClient()
+	multi := t.client.Multi()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()
@@ -2585,8 +2577,7 @@ func (t *RedisTest) TestMultiExecDiscard(c *C) {
 }
 
 func (t *RedisTest) TestMultiExecEmpty(c *C) {
-	multi, err := t.client.MultiClient()
+	multi := t.client.Multi()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()
@@ -2601,8 +2592,7 @@ func (t *RedisTest) TestMultiExecEmpty(c *C) {
 }
 
 func (t *RedisTest) TestMultiExecOnEmptyQueue(c *C) {
-	multi, err := t.client.MultiClient()
+	multi := t.client.Multi()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()
@@ -2612,16 +2602,15 @@ func (t *RedisTest) TestMultiExecOnEmptyQueue(c *C) {
 	c.Assert(reqs, HasLen, 0)
 }
 
-func (t *RedisTest) TestMultiExecIncrTransaction(c *C) {
+func (t *RedisTest) TestMultiExecIncr(c *C) {
-	multi, err := t.client.MultiClient()
+	multi := t.client.Multi()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()
 
 	reqs, err := multi.Exec(func() {
 		for i := int64(0); i < 20000; i++ {
-			multi.Incr("TestIncrTransactionKey")
+			multi.Incr("key")
 		}
 	})
 	c.Assert(err, IsNil)
@@ -2632,14 +2621,13 @@ func (t *RedisTest) TestMultiExecIncrTransaction(c *C) {
 		}
 	}
 
-	get := t.client.Get("TestIncrTransactionKey")
+	get := t.client.Get("key")
 	c.Assert(get.Err(), IsNil)
 	c.Assert(get.Val(), Equals, "20000")
 }
 
 func (t *RedisTest) transactionalIncr(c *C) ([]redis.Req, error) {
-	multi, err := t.client.MultiClient()
+	multi := t.client.Multi()
-	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()