github.com/pawelgaczynski/gain@v0.4.0-alpha.0.20230821120126-41f1e60a18da/write.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  	"github.com/pawelgaczynski/gain/pkg/errors"
    19  	"github.com/pawelgaczynski/giouring"
    20  )
    21  
    22  type writer struct {
    23  	ring    *giouring.Ring
    24  	sendMsg bool
    25  }
    26  
    27  func (w *writer) addWriteRequest(conn *connection, link bool) error {
    28  	entry := w.ring.GetSQE()
    29  	if entry == nil {
    30  		return errors.ErrGettingSQE
    31  	}
    32  
    33  	if w.sendMsg {
    34  		entry.PrepareSendMsg(conn.fd, conn.msgHdr, 0)
    35  		entry.UserData = writeDataFlag | uint64(conn.key)
    36  	} else {
    37  		entry.PrepareSend(
    38  			conn.fd,
    39  			uintptr(conn.outboundReadAddress()),
    40  			uint32(conn.outboundBuffer.Buffered()),
    41  			0)
    42  		entry.UserData = writeDataFlag | uint64(conn.fd)
    43  	}
    44  
    45  	if link {
    46  		entry.Flags |= giouring.SqeIOLink
    47  	}
    48  
    49  	conn.state = connWrite
    50  	conn.setKernelSpace()
    51  
    52  	return nil
    53  }
    54  
    55  func newWriter(ring *giouring.Ring, sendMsg bool) *writer {
    56  	return &writer{
    57  		ring:    ring,
    58  		sendMsg: sendMsg,
    59  	}
    60  }