func (p *tcpServer) Handle(clientConn net.Conn) {
p.ctx.nsqd.logf("TCP: new client(%s)", clientConn.RemoteAddr())
// The client should initialize itself by sending a 4 byte sequence indicating
// the version of the protocol that it intends to communicate, this will allow us
// to gracefully upgrade the protocol away from text/line oriented to whatever...
buf := make([]byte, 4)
_, err := io.ReadFull(clientConn, buf)
if err != nil {
p.ctx.nsqd.logf("ERROR: failed to read protocol version - %s", err)
return
}
protocolMagic := string(buf)
p.ctx.nsqd.logf("CLIENT(%s): desired protocol magic '%s'",
clientConn.RemoteAddr(), protocolMagic)
var prot protocol.Protocol
switch protocolMagic {
case " V2":
prot = &protocolV2{ctx: p.ctx}
default:
protocol.SendFramedResponse(clientConn, frameTypeError, []byte("E_BAD_PROTOCOL"))
clientConn.Close()
p.ctx.nsqd.logf("ERROR: client(%s) bad protocol magic '%s'",
clientConn.RemoteAddr(), protocolMagic)
return
}
err = prot.IOLoop(clientConn)
if err != nil {
p.ctx.nsqd.logf("ERROR: client(%s) - %s", clientConn.RemoteAddr(), err)
return
}
}
func (p *protocolV2) Send(client *clientV2, frameType int32, data []byte) error {
client.writeLock.Lock()
var zeroTime time.Time
if client.HeartbeatInterval > 0 {
client.SetWriteDeadline(time.Now().Add(client.HeartbeatInterval))
} else {
client.SetWriteDeadline(zeroTime)
}
_, err := protocol.SendFramedResponse(client.Writer, frameType, data)
if err != nil {
client.writeLock.Unlock()
return err
}
if frameType != frameTypeMessage {
err = client.Flush()
}
client.writeLock.Unlock()
return err
}