github.com/pawelgaczynski/gain@v0.4.0-alpha.0.20230821120126-41f1e60a18da/socket.go (about)

     1  // Copyright (c) 2023 Paweł Gaczyński
     2  // Copyright (c) 2019 Andy Pan
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  
    16  package gain
    17  
    18  import (
    19  	"net"
    20  	"runtime"
    21  	"strings"
    22  
    23  	"github.com/pawelgaczynski/gain/pkg/errors"
    24  	gainNet "github.com/pawelgaczynski/gain/pkg/net"
    25  	"github.com/pawelgaczynski/gain/pkg/socket"
    26  )
    27  
    28  func parseProtoAddr(addr string) (string, string) {
    29  	network := gainNet.TCP
    30  
    31  	address := strings.ToLower(addr)
    32  	if strings.Contains(address, "://") {
    33  		pair := strings.Split(address, "://")
    34  		network = pair[0]
    35  		address = pair[1]
    36  	}
    37  
    38  	return network, address
    39  }
    40  
    41  type listener struct {
    42  	fd               int
    43  	addr             net.Addr
    44  	address, network string
    45  	sockOpts         []socket.Option
    46  }
    47  
    48  func (ln *listener) normalize() error {
    49  	var err error
    50  
    51  	switch ln.network {
    52  	case gainNet.TCP, gainNet.TCP4, gainNet.TCP6:
    53  		ln.fd, ln.addr, err = socket.TCPSocket(ln.network, ln.address, true, ln.sockOpts...)
    54  		ln.network = gainNet.TCP
    55  
    56  	case gainNet.UDP, gainNet.UDP4, gainNet.UDP6:
    57  		ln.fd, ln.addr, err = socket.UDPSocket(ln.network, ln.address, false, ln.sockOpts...)
    58  		ln.network = gainNet.UDP
    59  
    60  	default:
    61  		err = errors.ErrUnsupportedProtocol
    62  	}
    63  
    64  	return err
    65  }
    66  
    67  func initListener(network, addr string, config Config) (*listener, error) {
    68  	var (
    69  		ln       *listener
    70  		err      error
    71  		sockOpts []socket.Option
    72  	)
    73  
    74  	sockOpt := socket.Option{SetSockOpt: socket.SetReuseport, Opt: 1}
    75  	sockOpts = append(sockOpts, sockOpt)
    76  	sockOpt = socket.Option{SetSockOpt: socket.SetReuseAddr, Opt: 1}
    77  	sockOpts = append(sockOpts, sockOpt)
    78  
    79  	if strings.HasPrefix(network, gainNet.TCP) {
    80  		sockOpt = socket.Option{SetSockOpt: socket.SetNoDelay, Opt: 1}
    81  		sockOpts = append(sockOpts, sockOpt)
    82  
    83  		sockOpt = socket.Option{SetSockOpt: socket.SetQuickAck, Opt: 1}
    84  		sockOpts = append(sockOpts, sockOpt)
    85  
    86  		sockOpt = socket.Option{SetSockOpt: socket.SetFastOpen, Opt: 1}
    87  		sockOpts = append(sockOpts, sockOpt)
    88  	}
    89  
    90  	if config.SocketRecvBufferSize > 0 {
    91  		sockOpt = socket.Option{SetSockOpt: socket.SetRecvBuffer, Opt: config.SocketRecvBufferSize}
    92  		sockOpts = append(sockOpts, sockOpt)
    93  	}
    94  
    95  	if config.SocketSendBufferSize > 0 {
    96  		sockOpt = socket.Option{SetSockOpt: socket.SetSendBuffer, Opt: config.SocketSendBufferSize}
    97  		sockOpts = append(sockOpts, sockOpt)
    98  	}
    99  
   100  	ln = &listener{network: network, address: addr, sockOpts: sockOpts}
   101  	err = ln.normalize()
   102  
   103  	if config.CBPFilter {
   104  		err = newFilter(uint32(runtime.NumCPU())).applyTo(ln.fd)
   105  		if err != nil {
   106  			return ln, err
   107  		}
   108  	}
   109  
   110  	return ln, err
   111  }