github.com/tickoalcantara12/micro/v3@v3.0.0-20221007104245-9d75b9bcbab9/util/socket/socket.go (about)

     1  // Copyright 2020 Asim Aslam
     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  //     https://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  // Original source: github.com/micro/go-micro/v3/util/socket/socket.go
    16  
    17  // Package socket provides a pseudo socket
    18  package socket
    19  
    20  import (
    21  	"io"
    22  
    23  	"github.com/tickoalcantara12/micro/v3/service/network/transport"
    24  )
    25  
    26  // Socket is our pseudo socket for transport.Socket
    27  type Socket struct {
    28  	id string
    29  	// closed
    30  	closed chan bool
    31  	// remote addr
    32  	remote string
    33  	// local addr
    34  	local string
    35  	// send chan
    36  	send chan *transport.Message
    37  	// recv chan
    38  	recv chan *transport.Message
    39  }
    40  
    41  func (s *Socket) SetLocal(l string) {
    42  	s.local = l
    43  }
    44  
    45  func (s *Socket) SetRemote(r string) {
    46  	s.remote = r
    47  }
    48  
    49  // Accept passes a message to the socket which will be processed by the call to Recv
    50  func (s *Socket) Accept(m *transport.Message) error {
    51  	select {
    52  	case s.recv <- m:
    53  		return nil
    54  	case <-s.closed:
    55  		return io.EOF
    56  	}
    57  }
    58  
    59  // Process takes the next message off the send queue created by a call to Send
    60  func (s *Socket) Process(m *transport.Message) error {
    61  	select {
    62  	case msg := <-s.send:
    63  		*m = *msg
    64  	case <-s.closed:
    65  		// see if we need to drain
    66  		select {
    67  		case msg := <-s.send:
    68  			*m = *msg
    69  			return nil
    70  		default:
    71  			return io.EOF
    72  		}
    73  	}
    74  	return nil
    75  }
    76  
    77  func (s *Socket) Remote() string {
    78  	return s.remote
    79  }
    80  
    81  func (s *Socket) Local() string {
    82  	return s.local
    83  }
    84  
    85  func (s *Socket) Send(m *transport.Message) error {
    86  	// send a message
    87  	select {
    88  	case s.send <- m:
    89  	case <-s.closed:
    90  		return io.EOF
    91  	}
    92  
    93  	return nil
    94  }
    95  
    96  func (s *Socket) Recv(m *transport.Message) error {
    97  	// receive a message
    98  	select {
    99  	case msg := <-s.recv:
   100  		// set message
   101  		*m = *msg
   102  	case <-s.closed:
   103  		return io.EOF
   104  	}
   105  
   106  	// return nil
   107  	return nil
   108  }
   109  
   110  // Close closes the socket
   111  func (s *Socket) Close() error {
   112  	select {
   113  	case <-s.closed:
   114  		// no op
   115  	default:
   116  		close(s.closed)
   117  	}
   118  	return nil
   119  }
   120  
   121  // New returns a new pseudo socket which can be used in the place of a transport socket.
   122  // Messages are sent to the socket via Accept and receives from the socket via Process.
   123  // SetLocal/SetRemote should be called before using the socket.
   124  func New(id string) *Socket {
   125  	return &Socket{
   126  		id:     id,
   127  		closed: make(chan bool),
   128  		local:  "local",
   129  		remote: "remote",
   130  		send:   make(chan *transport.Message, 128),
   131  		recv:   make(chan *transport.Message, 128),
   132  	}
   133  }