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

     1  // Copyright (c) 2023 Paweł Gaczyński
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package gain
    16  
    17  import (
    18  	"net"
    19  	"syscall"
    20  	"unsafe"
    21  
    22  	"github.com/pawelgaczynski/gain/pkg/errors"
    23  	"github.com/pawelgaczynski/gain/pkg/socket"
    24  	"github.com/pawelgaczynski/giouring"
    25  )
    26  
    27  type acceptor struct {
    28  	ring              *giouring.Ring
    29  	fd                int
    30  	clientAddr        *syscall.RawSockaddrAny
    31  	clientLenPointer  *uint32
    32  	connectionManager *connectionManager
    33  }
    34  
    35  func (a *acceptor) addAcceptRequest() error {
    36  	entry := a.ring.GetSQE()
    37  	if entry == nil {
    38  		return errors.ErrGettingSQE
    39  	}
    40  
    41  	entry.PrepareAccept(
    42  		a.fd, uintptr(unsafe.Pointer(a.clientAddr)), uint64(uintptr(unsafe.Pointer(a.clientLenPointer))), 0)
    43  	entry.UserData = acceptDataFlag | uint64(a.fd)
    44  
    45  	return nil
    46  }
    47  
    48  func (a *acceptor) addAcceptConnRequest() error {
    49  	err := a.addAcceptRequest()
    50  	if err != nil {
    51  		return err
    52  	}
    53  
    54  	conn := a.connectionManager.getFd(a.fd)
    55  	conn.state = connAccept
    56  
    57  	return nil
    58  }
    59  
    60  func (a *acceptor) lastClientAddr() (net.Addr, error) {
    61  	addr, err := anyToSockaddr(a.clientAddr)
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  
    66  	return socket.SockaddrToTCPOrUnixAddr(addr), nil
    67  }
    68  
    69  func newAcceptor(ring *giouring.Ring, connectionManager *connectionManager) *acceptor {
    70  	acceptor := &acceptor{
    71  		ring:              ring,
    72  		connectionManager: connectionManager,
    73  	}
    74  	acceptor.clientAddr, acceptor.clientLenPointer = createClientAddr()
    75  
    76  	return acceptor
    77  }