github.com/pawelgaczynski/gain@v0.4.0-alpha.0.20230821120126-41f1e60a18da/conn_closer.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  	"os"
    19  	"syscall"
    20  
    21  	"github.com/pawelgaczynski/gain/pkg/errors"
    22  	"github.com/pawelgaczynski/giouring"
    23  	"github.com/rs/zerolog"
    24  )
    25  
    26  type connCloser struct {
    27  	ring   *giouring.Ring
    28  	logger zerolog.Logger
    29  }
    30  
    31  func (c *connCloser) addCloseRequest(fd int) (*giouring.SubmissionQueueEntry, error) {
    32  	entry := c.ring.GetSQE()
    33  	if entry == nil {
    34  		return nil, errors.ErrGettingSQE
    35  	}
    36  
    37  	entry.PrepareClose(fd)
    38  	entry.UserData = closeConnFlag | uint64(fd)
    39  
    40  	return entry, nil
    41  }
    42  
    43  func (c *connCloser) addCloseConnRequest(conn *connection) error {
    44  	_, err := c.addCloseRequest(conn.fd)
    45  	if err != nil {
    46  		return err
    47  	}
    48  	conn.state = connClose
    49  
    50  	return nil
    51  }
    52  
    53  func (c *connCloser) syscallCloseSocket(fileDescriptor int) error {
    54  	return os.NewSyscallError("shutdown", syscall.Shutdown(fileDescriptor, syscall.SHUT_RDWR))
    55  }
    56  
    57  func newConnCloser(ring *giouring.Ring, logger zerolog.Logger) *connCloser {
    58  	return &connCloser{
    59  		ring:   ring,
    60  		logger: logger,
    61  	}
    62  }