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server_transport_tcp.go
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server_transport_tcp.go
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package transport
import (
"fmt"
"net"
"runtime"
"go.uber.org/zap"
"golang.org/x/sys/unix"
"github.com/soulnov23/go-tool/pkg/buffer"
"github.com/soulnov23/go-tool/pkg/cache"
"github.com/soulnov23/go-tool/pkg/framework/log"
"github.com/soulnov23/go-tool/pkg/netpoll"
)
func init() {
RegisterServerTransportFunc("tcp", newServerTransportTCP)
RegisterServerTransportFunc("tcp4", newServerTransportTCP)
RegisterServerTransportFunc("tcp6", newServerTransportTCP)
}
type serverTransportTCP struct {
address string
network string
protocol string
epolls []*netpoll.Epoll
localAddr net.Addr
localSockAddr unix.Sockaddr
opts *ServerTransportOptions
}
func newServerTransportTCP(address, network, protocol string, opts ...ServerTransportOption) ServerTransport {
transport := &serverTransportTCP{
address: address,
network: network,
protocol: protocol,
opts: &ServerTransportOptions{
coreSize: runtime.GOMAXPROCS(0),
},
}
for _, opt := range opts {
opt(transport.opts)
}
return transport
}
func (t *serverTransportTCP) ListenAndServe() error {
for i := 0; i < t.opts.coreSize; i++ {
epoll, err := netpoll.NewEpoll(log.DefaultLogger.InfoFields)
if err != nil {
return fmt.Errorf("netpoll.NewEpoll: %v", err)
}
addr, err := netpoll.ResolveAddr(t.network, t.address)
if err != nil {
return fmt.Errorf("netpoll.ResolveAddr: %v", err)
}
t.localAddr = addr
sockaddr, err := netpoll.ResolveSockaddr(t.network, t.address)
if err != nil {
return fmt.Errorf("netpoll.ResolveSockaddr: %v", err)
}
t.localSockAddr = sockaddr
listenFD, err := netpoll.Socket(t.network)
if err != nil {
return fmt.Errorf("netpoll.Socket[%s]: %v", t.network, err)
}
if err := netpoll.SetSocketReuseaddr(listenFD); err != nil {
unix.Close(listenFD)
return fmt.Errorf("netpoll.SetSocketReuseaddr[%d]: %v", listenFD, err)
}
if err := netpoll.SetSocketReUsePort(listenFD); err != nil {
unix.Close(listenFD)
return fmt.Errorf("netpoll.SetSocketReUsePort[%d]: %v", listenFD, err)
}
if err := unix.Bind(listenFD, t.localSockAddr); err != nil {
unix.Close(listenFD)
return fmt.Errorf("unix.Bind[%d] address[%s] network[%s]: %v", listenFD, t.network, t.address, err)
}
backlog := netpoll.MaxListenerBacklog()
if err := unix.Listen(listenFD, backlog); err != nil {
unix.Close(listenFD)
return fmt.Errorf("unix.Listen[%d] backlog[%d]: %v", listenFD, backlog, err)
}
log.DefaultLogger.InfoFields("listen success", zap.Int("epoll_fd", epoll.FD()), zap.Int("listen_fd", listenFD), zap.String("network", t.network), zap.String("address", t.address))
operator := epoll.Alloc()
operator.FD = listenFD
operator.Epoll = epoll
operator.OnRead = t.accept
if err := epoll.Control(operator, netpoll.ReadWritable); err != nil {
unix.Close(listenFD)
return fmt.Errorf("epoll_fd[%d] epoll.Control listen_fd[%d]: %v", epoll.FD(), listenFD, err)
}
go func() {
if err := epoll.Wait(); err != nil {
log.DefaultLogger.FatalFields("epoll.Wait", zap.Error(err), zap.Reflect("service_transport", t))
panic(fmt.Sprintf("epoll.Wait: %v", err))
}
}()
}
return nil
}
func (t *serverTransportTCP) accept(epoll *netpoll.Epoll, operator *netpoll.FDOperator) {
for {
clientFD, addr, err := unix.Accept4(operator.FD, unix.SOCK_CLOEXEC)
if err != nil {
if err == unix.EAGAIN {
break
} else if err == unix.EINTR {
continue
} else {
log.DefaultLogger.ErrorFields("accept client", zap.Error(err), zap.Int("listen_fd", operator.FD))
continue
}
}
if err := netpoll.SetSocketNonBlock(clientFD); err != nil {
unix.Close(clientFD)
log.DefaultLogger.ErrorFields("netpoll.SetSocketNonBlock", zap.Error(err), zap.Int("client_fd", clientFD))
continue
}
netpoll.SetSocketCloseExec(clientFD)
if err := netpoll.SetSocketTCPNodelay(clientFD); err != nil {
unix.Close(clientFD)
log.DefaultLogger.ErrorFields("netpoll.SetSocketTCPNodelay", zap.Error(err), zap.Int("client_fd", clientFD))
continue
}
remoteAddr, err := netpoll.SockaddrToAddr(t.network, addr)
if err != nil {
log.DefaultLogger.ErrorFields("netpoll.SockaddrToAddr", zap.Error(err), zap.Reflect("sockaddr", addr))
continue
}
clientOperator := epoll.Alloc()
clientOperator.FD = clientFD
clientOperator.Epoll = epoll
clientOperator.OnRead = t.read
clientOperator.OnWrite = t.write
clientOperator.OnHup = t.hup
clientOperator.Data = &tcpConnection{
fd: clientFD,
localAddr: t.localAddr,
remoteAddr: remoteAddr,
readBuffer: buffer.New(),
writeBuffer: buffer.New(),
}
if err := operator.Epoll.Control(clientOperator, netpoll.Readable); err != nil {
unix.Close(clientFD)
log.DefaultLogger.ErrorFields("epoll.Control", zap.Error(err), zap.Int("epoll_fd", epoll.FD()), zap.Int("client_fd", clientFD), zap.String("epoll_event", netpoll.EventString(netpoll.Readable)))
continue
}
log.DefaultLogger.InfoFields("accept success", zap.Int("epoll_fd", epoll.FD()), zap.Int("listen_fd", operator.FD), zap.Int("client_fd", clientOperator.FD), zap.String("remote_address", remoteAddr.String()), zap.String("local_address", t.localAddr.String()))
}
}
func (t *serverTransportTCP) read(epoll *netpoll.Epoll, operator *netpoll.FDOperator) {
tcpConn, ok := operator.Data.(*tcpConnection)
if !ok || tcpConn == nil {
log.DefaultLogger.ErrorFields("data is not tcpConnection", zap.Reflect("operator", operator))
return
}
tcpConn.readBuffer.GC()
buf := cache.New(buffer.Block8k)
offset := 0
for {
n, err := unix.Read(tcpConn.fd, buf[offset:])
if err != nil {
if err == unix.EINTR /*中断信号触发系统调用中断直接忽略继续读取*/ {
continue
} else if err == unix.EAGAIN || err == unix.EWOULDBLOCK /*非阻塞IO没有数据可读时直接返回等待OUT事件再次触发,不打印了不然日志太多*/ {
break
} else if err == unix.EBADF || err == unix.EINVAL /*fd被关闭已经是无效的文件描述符,在epoll事件模型中把HUP放最前面了,这里不会发生*/ {
goto ERROR
} else if err == unix.ECONNRESET /*connection reset by peer在read进行中对端意外关闭连接,TCP发起RST报文*/ {
goto ERROR
} else {
goto ERROR
}
ERROR:
log.DefaultLogger.ErrorFields("unix.Read", zap.Error(err), zap.Int("epoll_fd", operator.Epoll.FD()), zap.Int("client_fd", operator.FD))
break
}
offset += n
if n == 0 /*在read进行中对端主动关闭连接调用了Close,TCP发起FIN报文*/ || offset == buffer.Block8k /*读取8k就走避免饥饿连接*/ {
break
}
}
tcpConn.readBuffer.Write(buf[:offset])
log.DefaultLogger.InfoFields("read success", zap.Int("epoll_fd", operator.Epoll.FD()), zap.Int("client_fd", operator.FD), zap.ByteString("buffer", buf[:offset]))
}
func (t *serverTransportTCP) write(epoll *netpoll.Epoll, operator *netpoll.FDOperator) {
tcpConn, ok := operator.Data.(*tcpConnection)
if !ok || tcpConn == nil {
log.DefaultLogger.ErrorFields("data is not tcpConnection", zap.Reflect("operator", operator))
return
}
buf, err := tcpConn.writeBuffer.Peek(int(tcpConn.writeBuffer.Size()))
if err != nil {
// 数据发送完了返回
return
}
offset := 0
for {
n, err := unix.Write(tcpConn.fd, buf[offset:])
if err != nil {
if err == unix.EINTR /*中断信号触发系统调用中断直接忽略继续读取*/ {
continue
} else if err == unix.EAGAIN || err == unix.EWOULDBLOCK /*非阻塞IO没有数据可读时直接返回等待OUT事件再次触发,不打印了不然日志太多*/ {
break
} else if err == unix.EBADF || err == unix.EINVAL /*fd被关闭已经是无效的文件描述符,在epoll事件模型中把HUP放最前面了,这里不会发生*/ {
goto ERROR
} else if err == unix.EPIPE /*broken pipe在write进行中对端意外关闭连接,TCP发起RST报文,触发SIGPIPE信号*/ {
goto ERROR
} else {
goto ERROR
}
ERROR:
log.DefaultLogger.ErrorFields("unix.Write", zap.Error(err), zap.Int("epoll_fd", operator.Epoll.FD()), zap.Int("client_fd", operator.FD))
break
}
offset += n
if offset == len(buf) /*buf全部写进去了*/ {
break
}
}
_ = tcpConn.writeBuffer.Skip(offset)
tcpConn.writeBuffer.GC()
log.DefaultLogger.InfoFields("write success", zap.Int("epoll_fd", operator.Epoll.FD()), zap.Int("client_fd", operator.FD), zap.ByteString("buffer", buf[:offset]))
}
func (t *serverTransportTCP) hup(epoll *netpoll.Epoll, operator *netpoll.FDOperator) {
unix.Close(operator.FD)
tcpConn, ok := operator.Data.(*tcpConnection)
if !ok || tcpConn == nil {
log.DefaultLogger.ErrorFields("data is not tcpConnection", zap.Reflect("operator", operator))
return
}
tcpConn.readBuffer.Delete()
tcpConn.writeBuffer.Delete()
log.DefaultLogger.InfoFields("close success", zap.Int("epoll_fd", epoll.FD()), zap.Int("client_fd", operator.FD), zap.String("remote_address", tcpConn.remoteAddr.String()), zap.String("local_address", tcpConn.localAddr.String()))
}
func (t *serverTransportTCP) Close() {
for _, epoll := range t.epolls {
epoll.Close()
}
}
type Operator interface {
OnRequest(conn *tcpConnection)
}
type tcpConnection struct {
fd int
localAddr net.Addr
remoteAddr net.Addr
readBuffer *buffer.Buffer
writeBuffer *buffer.Buffer
Operator
}
func (conn *tcpConnection) LocalAddr() net.Addr {
return conn.localAddr
}
func (conn *tcpConnection) RemoteAddr() net.Addr {
return conn.remoteAddr
}
func (conn *tcpConnection) ReadBufferSize() uint64 {
return conn.readBuffer.Size()
}
func (conn *tcpConnection) Peek(size int) ([]byte, error) {
return conn.readBuffer.Peek(size)
}
func (conn *tcpConnection) Skip(size int) error {
return conn.readBuffer.Skip(size)
}
func (conn *tcpConnection) Read(size int) ([]byte, error) {
return conn.readBuffer.Read(size)
}
func (conn *tcpConnection) Write(buf []byte) {
conn.writeBuffer.Write(buf)
}