github.com/gdamore/mangos@v1.4.0/examples/raw/server.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  	"math/rand"
    21  	"sync"
    22  	"time"
    23  
    24  	"nanomsg.org/go-mangos"
    25  	"nanomsg.org/go-mangos/protocol/rep"
    26  	"nanomsg.org/go-mangos/transport/ipc"
    27  	"nanomsg.org/go-mangos/transport/tcp"
    28  )
    29  
    30  // Our protocol is simple.  Request packet is empty.  The reply
    31  // is the replier's ID and the time it delayed responding for (us).
    32  
    33  func serverWorker(sock mangos.Socket, id int) {
    34  	var err error
    35  
    36  	delay := rand.Intn(int(time.Second))
    37  
    38  	for {
    39  		var m *mangos.Message
    40  
    41  		if m, err = sock.RecvMsg(); err != nil {
    42  			return
    43  		}
    44  
    45  		m.Body = make([]byte, 4)
    46  
    47  		time.Sleep(time.Duration(delay))
    48  
    49  		binary.BigEndian.PutUint32(m.Body[0:], uint32(id))
    50  
    51  		if err = sock.SendMsg(m); err != nil {
    52  			return
    53  		}
    54  	}
    55  }
    56  
    57  func server(url string, nworkers int) {
    58  	var sock mangos.Socket
    59  	var err error
    60  	var wg sync.WaitGroup
    61  
    62  	rand.Seed(time.Now().UnixNano())
    63  
    64  	if sock, err = rep.NewSocket(); err != nil {
    65  		die("can't get new rep socket: %s", err)
    66  	}
    67  	if err = sock.SetOption(mangos.OptionRaw, true); err != nil {
    68  		die("can't set raw mode: %s", err)
    69  	}
    70  	sock.AddTransport(ipc.NewTransport())
    71  	sock.AddTransport(tcp.NewTransport())
    72  	if err = sock.Listen(url); err != nil {
    73  		die("can't listen on rep socket: %s", err.Error())
    74  	}
    75  	wg.Add(nworkers)
    76  	fmt.Printf("Starting %d workers\n", nworkers)
    77  	for id := 0; id < nworkers; id++ {
    78  		go func(id int) {
    79  			defer wg.Done()
    80  			serverWorker(sock, id)
    81  		}(id)
    82  	}
    83  	wg.Wait()
    84  }