github.com/gdamore/mangos@v1.4.0/connipc_posix.go (about)

     1  // +build !windows
     2  
     3  // Copyright 2018 The Mangos Authors
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use file except in compliance with the License.
     7  // You may obtain a copy of the license at
     8  //
     9  //    http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  
    17  package mangos
    18  
    19  import (
    20  	"encoding/binary"
    21  	"io"
    22  	"net"
    23  )
    24  
    25  // NewConnPipeIPC allocates a new Pipe using the IPC exchange protocol.
    26  func NewConnPipeIPC(c net.Conn, sock Socket, props ...interface{}) (Pipe, error) {
    27  	p := &connipc{conn: conn{c: c, proto: sock.GetProtocol(), sock: sock}}
    28  
    29  	if err := p.handshake(props); err != nil {
    30  		return nil, err
    31  	}
    32  
    33  	return p, nil
    34  }
    35  
    36  func (p *connipc) Send(msg *Message) error {
    37  
    38  	l := uint64(len(msg.Header) + len(msg.Body))
    39  	//	one := [1]byte{1}
    40  	var err error
    41  
    42  	// send length header
    43  	header := make([]byte, 9)
    44  	header[0] = 1
    45  	binary.BigEndian.PutUint64(header[1:], l)
    46  
    47  	if _, err = p.c.Write(header[:]); err != nil {
    48  		return err
    49  	}
    50  
    51  	if _, err = p.c.Write(msg.Header); err != nil {
    52  		return err
    53  	}
    54  	// hope this works
    55  	if _, err = p.c.Write(msg.Body); err != nil {
    56  		return err
    57  	}
    58  	msg.Free()
    59  	return nil
    60  }
    61  
    62  func (p *connipc) Recv() (*Message, error) {
    63  
    64  	var sz int64
    65  	var err error
    66  	var msg *Message
    67  	var one [1]byte
    68  
    69  	if _, err = p.c.Read(one[:]); err != nil {
    70  		return nil, err
    71  	}
    72  	if err = binary.Read(p.c, binary.BigEndian, &sz); err != nil {
    73  		return nil, err
    74  	}
    75  
    76  	// Limit messages to the maximum receive value, if not
    77  	// unlimited.  This avoids a potential denaial of service.
    78  	if sz < 0 || (p.maxrx > 0 && sz > p.maxrx) {
    79  		return nil, ErrTooLong
    80  	}
    81  	msg = NewMessage(int(sz))
    82  	msg.Body = msg.Body[0:sz]
    83  	if _, err = io.ReadFull(p.c, msg.Body); err != nil {
    84  		msg.Free()
    85  		return nil, err
    86  	}
    87  	return msg, nil
    88  }