github.com/gdamore/mangos@v1.4.0/examples/raw/client.go (about)

     1  // Copyright 2018 The Mangos Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use 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 main
    16  
    17  import (
    18  	"encoding/binary"
    19  	"fmt"
    20  	"sync"
    21  
    22  	"nanomsg.org/go-mangos"
    23  	"nanomsg.org/go-mangos/protocol/req"
    24  	"nanomsg.org/go-mangos/transport/ipc"
    25  	"nanomsg.org/go-mangos/transport/tcp"
    26  )
    27  
    28  // synchronize our output messaging so we don't overlap
    29  var lock sync.Mutex
    30  
    31  func clientWorker(url string, id int) {
    32  	var sock mangos.Socket
    33  	var m *mangos.Message
    34  	var err error
    35  
    36  	if sock, err = req.NewSocket(); err != nil {
    37  		die("can't get new req socket: %s", err.Error())
    38  	}
    39  
    40  	// Leave this in Cooked mode!
    41  
    42  	sock.AddTransport(ipc.NewTransport())
    43  	sock.AddTransport(tcp.NewTransport())
    44  	if err = sock.Dial(url); err != nil {
    45  		die("can't dial on req socket: %s", err.Error())
    46  	}
    47  
    48  	// send an empty messsage
    49  	m = mangos.NewMessage(1)
    50  	if err = sock.SendMsg(m); err != nil {
    51  		die("can't send request: %s", err.Error())
    52  	}
    53  
    54  	if m, err = sock.RecvMsg(); err != nil {
    55  		die("can't recv reply: %s", err.Error())
    56  	}
    57  	sock.Close()
    58  
    59  	if len(m.Body) != 4 {
    60  		die("bad response len: %d", len(m.Body))
    61  	}
    62  
    63  	worker := binary.BigEndian.Uint32(m.Body[0:])
    64  
    65  	lock.Lock()
    66  	fmt.Printf("Client: %4d   Server: %4d\n", id, worker)
    67  	lock.Unlock()
    68  }
    69  
    70  func client(url string, nworkers int) {
    71  
    72  	var wg sync.WaitGroup
    73  	for i := 0; i < nworkers; i++ {
    74  		wg.Add(1)
    75  		go func(i int) {
    76  			defer wg.Done()
    77  			clientWorker(url, i)
    78  		}(i)
    79  	}
    80  	wg.Wait()
    81  
    82  }