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client_transport_udp.go
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client_transport_udp.go
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//
//
// Tencent is pleased to support the open source community by making tRPC available.
//
// Copyright (C) 2023 THL A29 Limited, a Tencent company.
// All rights reserved.
//
// If you have downloaded a copy of the tRPC source code from Tencent,
// please note that tRPC source code is licensed under the Apache 2.0 License,
// A copy of the Apache 2.0 License is included in this file.
//
//
package transport
import (
"context"
"fmt"
"net"
"trpc.group/trpc-go/trpc-go/codec"
"trpc.group/trpc-go/trpc-go/errs"
"trpc.group/trpc-go/trpc-go/internal/packetbuffer"
"trpc.group/trpc-go/trpc-go/internal/report"
)
const defaultUDPRecvBufSize = 64 * 1024
// udpRoundTrip sends UDP requests.
func (c *clientTransport) udpRoundTrip(ctx context.Context, reqData []byte,
opts *RoundTripOptions) ([]byte, error) {
if opts.FramerBuilder == nil {
return nil, errs.NewFrameError(errs.RetClientConnectFail,
"udp client transport: framer builder empty")
}
conn, addr, err := c.dialUDP(ctx, opts)
if err != nil {
return nil, err
}
defer conn.Close()
msg := codec.Message(ctx)
msg.WithRemoteAddr(addr)
msg.WithLocalAddr(conn.LocalAddr())
if ctx.Err() == context.Canceled {
return nil, errs.NewFrameError(errs.RetClientCanceled,
"udp client transport canceled before Write: "+ctx.Err().Error())
}
if ctx.Err() == context.DeadlineExceeded {
return nil, errs.NewFrameError(errs.RetClientTimeout,
"udp client transport timeout before Write: "+ctx.Err().Error())
}
report.UDPClientTransportSendSize.Set(float64(len(reqData)))
if err := c.udpWriteFrame(conn, reqData, addr, opts); err != nil {
return nil, err
}
return c.udpReadFrame(ctx, conn, opts)
}
// udpReadFrame reads UDP frame.
func (c *clientTransport) udpReadFrame(
ctx context.Context, conn net.PacketConn, opts *RoundTripOptions) ([]byte, error) {
// If it is SendOnly, returns directly without waiting for the server's response.
if opts.ReqType == SendOnly {
return nil, errs.ErrClientNoResponse
}
select {
case <-ctx.Done():
return nil, errs.NewFrameError(errs.RetClientTimeout, "udp client transport select after Write: "+ctx.Err().Error())
default:
}
buf := packetbuffer.New(conn, defaultUDPRecvBufSize)
defer buf.Close()
fr := opts.FramerBuilder.New(buf)
req, err := fr.ReadFrame()
if err != nil {
report.UDPClientTransportReadFail.Incr()
if e, ok := err.(net.Error); ok {
if e.Timeout() {
return nil, errs.NewFrameError(errs.RetClientTimeout,
"udp client transport ReadFrame: "+err.Error())
}
return nil, errs.NewFrameError(errs.RetClientNetErr,
"udp client transport ReadFrom: "+err.Error())
}
return nil, errs.NewFrameError(errs.RetClientReadFrameErr,
"udp client transport ReadFrame: "+err.Error())
}
// One packet of udp corresponds to one trpc packet,
// and after parsing, there should not be any remaining data
if err := buf.Next(); err != nil {
report.UDPClientTransportUnRead.Incr()
return nil, errs.NewFrameError(errs.RetClientReadFrameErr,
fmt.Sprintf("udp client transport ReadFrame: %s", err))
}
report.UDPClientTransportReceiveSize.Set(float64(len(req)))
// Framer is used for every request so there is no need to copy memory.
return req, nil
}
// udpWriteReqData write UDP frame.
func (c *clientTransport) udpWriteFrame(conn net.PacketConn,
reqData []byte, addr *net.UDPAddr, opts *RoundTripOptions) error {
// Sending udp request packets
var num int
var err error
if opts.ConnectionMode == Connected {
udpconn := conn.(*net.UDPConn)
num, err = udpconn.Write(reqData)
} else {
num, err = conn.WriteTo(reqData, addr)
}
if err != nil {
if e, ok := err.(net.Error); ok && e.Timeout() {
return errs.NewFrameError(errs.RetClientTimeout, "udp client transport WriteTo: "+err.Error())
}
return errs.NewFrameError(errs.RetClientNetErr, "udp client transport WriteTo: "+err.Error())
}
if num != len(reqData) {
return errs.NewFrameError(errs.RetClientNetErr, "udp client transport WriteTo: num mismatch")
}
return nil
}
// dialUDP establishes an UDP connection.
func (c *clientTransport) dialUDP(ctx context.Context, opts *RoundTripOptions) (net.PacketConn, *net.UDPAddr, error) {
addr, err := net.ResolveUDPAddr(opts.Network, opts.Address)
if err != nil {
return nil, nil, errs.NewFrameError(errs.RetClientNetErr,
"udp client transport ResolveUDPAddr: "+err.Error())
}
var conn net.PacketConn
if opts.ConnectionMode == Connected {
var localAddr net.Addr
if opts.LocalAddr != "" {
localAddr, err = net.ResolveUDPAddr(opts.Network, opts.LocalAddr)
if err != nil {
return nil, nil, errs.NewFrameError(errs.RetClientNetErr,
"udp client transport LocalAddr ResolveUDPAddr: "+err.Error())
}
}
dialer := net.Dialer{
LocalAddr: localAddr,
}
var udpConn net.Conn
udpConn, err = dialer.Dial(opts.Network, opts.Address)
if err != nil {
return nil, nil, errs.NewFrameError(errs.RetClientConnectFail,
fmt.Sprintf("dial udp fail: %s", err.Error()))
}
var ok bool
conn, ok = udpConn.(net.PacketConn)
if !ok {
return nil, nil, errs.NewFrameError(errs.RetClientConnectFail,
"udp conn not implement net.PacketConn")
}
} else {
// Listen on all available IP addresses of the local system by default,
// and a port number is automatically chosen.
const defaultLocalAddr = ":"
localAddr := defaultLocalAddr
if opts.LocalAddr != "" {
localAddr = opts.LocalAddr
}
conn, err = net.ListenPacket(opts.Network, localAddr)
}
if err != nil {
return nil, nil, errs.NewFrameError(errs.RetClientNetErr, "udp client transport Dial: "+err.Error())
}
d, ok := ctx.Deadline()
if ok {
conn.SetDeadline(d)
}
return conn, addr, nil
}