tcp.go

时间:2022-04-21 11:44:30
package nsqd

import (
    "io"
    "net"

    "github.com/nsqio/nsq/internal/protocol"
)

type tcpServer struct {
    ctx *context
}

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
    }
}

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