add vendor

vendor/github.com/garyburd/redigo/redisx/connmux.go

@@ -0,0 +1,152 @@
+// Copyright 2014 Gary Burd
+//
+// Licensed under the Apache License, Version 2.0 (the "License"): you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations
+// under the License.
+
+package redisx
+
+import (
+	"errors"
+	"sync"
+
+	"github.com/garyburd/redigo/internal"
+	"github.com/garyburd/redigo/redis"
+)
+
+// ConnMux multiplexes one or more connections to a single underlying
+// connection. The ConnMux connections do not support concurrency, commands
+// that associate server side state with the connection or commands that put
+// the connection in a special mode.
+type ConnMux struct {
+	c redis.Conn
+
+	sendMu sync.Mutex
+	sendID uint
+
+	recvMu   sync.Mutex
+	recvID   uint
+	recvWait map[uint]chan struct{}
+}
+
+func NewConnMux(c redis.Conn) *ConnMux {
+	return &ConnMux{c: c, recvWait: make(map[uint]chan struct{})}
+}
+
+// Get gets a connection. The application must close the returned connection.
+func (p *ConnMux) Get() redis.Conn {
+	c := &muxConn{p: p}
+	c.ids = c.buf[:0]
+	return c
+}
+
+// Close closes the underlying connection.
+func (p *ConnMux) Close() error {
+	return p.c.Close()
+}
+
+type muxConn struct {
+	p   *ConnMux
+	ids []uint
+	buf [8]uint
+}
+
+func (c *muxConn) send(flush bool, cmd string, args ...interface{}) error {
+	if internal.LookupCommandInfo(cmd).Set != 0 {
+		return errors.New("command not supported by mux pool")
+	}
+	p := c.p
+	p.sendMu.Lock()
+	id := p.sendID
+	c.ids = append(c.ids, id)
+	p.sendID++
+	err := p.c.Send(cmd, args...)
+	if flush {
+		err = p.c.Flush()
+	}
+	p.sendMu.Unlock()
+	return err
+}
+
+func (c *muxConn) Send(cmd string, args ...interface{}) error {
+	return c.send(false, cmd, args...)
+}
+
+func (c *muxConn) Flush() error {
+	p := c.p
+	p.sendMu.Lock()
+	err := p.c.Flush()
+	p.sendMu.Unlock()
+	return err
+}
+
+func (c *muxConn) Receive() (interface{}, error) {
+	if len(c.ids) == 0 {
+		return nil, errors.New("mux pool underflow")
+	}
+
+	id := c.ids[0]
+	c.ids = c.ids[1:]
+	if len(c.ids) == 0 {
+		c.ids = c.buf[:0]
+	}
+
+	p := c.p
+	p.recvMu.Lock()
+	if p.recvID != id {
+		ch := make(chan struct{})
+		p.recvWait[id] = ch
+		p.recvMu.Unlock()
+		<-ch
+		p.recvMu.Lock()
+		if p.recvID != id {
+			panic("out of sync")
+		}
+	}
+
+	v, err := p.c.Receive()
+
+	id++
+	p.recvID = id
+	ch, ok := p.recvWait[id]
+	if ok {
+		delete(p.recvWait, id)
+	}
+	p.recvMu.Unlock()
+	if ok {
+		ch <- struct{}{}
+	}
+
+	return v, err
+}
+
+func (c *muxConn) Close() error {
+	var err error
+	if len(c.ids) == 0 {
+		return nil
+	}
+	c.Flush()
+	for _ = range c.ids {
+		_, err = c.Receive()
+	}
+	return err
+}
+
+func (c *muxConn) Do(cmd string, args ...interface{}) (interface{}, error) {
+	if err := c.send(true, cmd, args...); err != nil {
+		return nil, err
+	}
+	return c.Receive()
+}
+
+func (c *muxConn) Err() error {
+	return c.p.c.Err()
+}