forked from nulpunt/nulpunt
/
conn.go
188 lines (158 loc) · 3.75 KB
/
conn.go
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package nsq
import (
"bufio"
"bytes"
"compress/flate"
"crypto/tls"
"errors"
"fmt"
"github.com/mreiferson/go-snappystream"
"io"
"net"
"sync"
"time"
)
type nsqConn struct {
// 64bit atomic vars need to be first for proper alignment on 32bit platforms
messagesInFlight int64
messagesReceived uint64
messagesFinished uint64
messagesRequeued uint64
maxRdyCount int64
rdyCount int64
lastRdyCount int64
lastMsgTimestamp int64
sync.Mutex
net.Conn
tlsConn *tls.Conn
addr string
r io.Reader
w io.Writer
flateWriter *flate.Writer
readTimeout time.Duration
writeTimeout time.Duration
backoffCounter int32
rdyRetryTimer *time.Timer
rdyChan chan *nsqConn
finishedMessages chan *FinishedMessage
cmdChan chan *Command
exitChan chan int
drainReady chan int
stopFlag int32
stopper sync.Once
wg sync.WaitGroup
}
func newNSQConn(rdyChan chan *nsqConn, addr string,
readTimeout time.Duration, writeTimeout time.Duration) (*nsqConn, error) {
conn, err := net.DialTimeout("tcp", addr, time.Second)
if err != nil {
return nil, err
}
nc := &nsqConn{
Conn: conn,
addr: addr,
r: bufio.NewReader(conn),
w: conn,
readTimeout: readTimeout,
writeTimeout: writeTimeout,
maxRdyCount: 2500,
lastMsgTimestamp: time.Now().UnixNano(),
finishedMessages: make(chan *FinishedMessage),
cmdChan: make(chan *Command),
rdyChan: rdyChan,
exitChan: make(chan int),
drainReady: make(chan int),
}
_, err = nc.Write(MagicV2)
if err != nil {
nc.Close()
return nil, fmt.Errorf("[%s] failed to write magic - %s", addr, err.Error())
}
return nc, nil
}
func (c *nsqConn) String() string {
return c.addr
}
func (c *nsqConn) Read(p []byte) (int, error) {
c.SetReadDeadline(time.Now().Add(c.readTimeout))
return c.r.Read(p)
}
func (c *nsqConn) Write(p []byte) (int, error) {
c.SetWriteDeadline(time.Now().Add(c.writeTimeout))
return c.w.Write(p)
}
func (c *nsqConn) sendCommand(buf *bytes.Buffer, cmd *Command) error {
c.Lock()
defer c.Unlock()
buf.Reset()
err := cmd.Write(buf)
if err != nil {
return err
}
_, err = buf.WriteTo(c)
if err != nil {
return err
}
if c.flateWriter != nil {
return c.flateWriter.Flush()
}
return nil
}
func (c *nsqConn) readUnpackedResponse() (int32, []byte, error) {
resp, err := ReadResponse(c)
if err != nil {
return -1, nil, err
}
return UnpackResponse(resp)
}
func (c *nsqConn) upgradeTLS(conf *tls.Config) error {
c.tlsConn = tls.Client(c.Conn, conf)
err := c.tlsConn.Handshake()
if err != nil {
return err
}
c.r = bufio.NewReader(c.tlsConn)
c.w = c.tlsConn
frameType, data, err := c.readUnpackedResponse()
if err != nil {
return err
}
if frameType != FrameTypeResponse || !bytes.Equal(data, []byte("OK")) {
return errors.New("invalid response from TLS upgrade")
}
return nil
}
func (c *nsqConn) upgradeDeflate(level int) error {
conn := c.Conn
if c.tlsConn != nil {
conn = c.tlsConn
}
c.r = bufio.NewReader(flate.NewReader(conn))
fw, _ := flate.NewWriter(conn, level)
c.flateWriter = fw
c.w = fw
frameType, data, err := c.readUnpackedResponse()
if err != nil {
return err
}
if frameType != FrameTypeResponse || !bytes.Equal(data, []byte("OK")) {
return errors.New("invalid response from Deflate upgrade")
}
return nil
}
func (c *nsqConn) upgradeSnappy() error {
conn := c.Conn
if c.tlsConn != nil {
conn = c.tlsConn
}
c.r = bufio.NewReader(snappystream.NewReader(conn, snappystream.SkipVerifyChecksum))
c.w = snappystream.NewWriter(conn)
frameType, data, err := c.readUnpackedResponse()
if err != nil {
return err
}
if frameType != FrameTypeResponse || !bytes.Equal(data, []byte("OK")) {
return errors.New("invalid response from Snappy upgrade")
}
return nil
}