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pipeline.go
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pipeline.go
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// Copyright 2018 The Mangos Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use file except in compliance with the License.
// You may obtain a copy of the license at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// pipeline implements a one way pipe example. node0 is a listening
// pull socket, and node1 is a dialing push socket.
//
// To use:
//
// $ go build .
// $ url=tcp://127.0.0.1:40899
// $ ./pipeline node0 $url & node0=$! && sleep 1
// $ ./pipeline node1 $url "Hello, World."
// $ ./pipeline node1 $url "Goodbye."
// $ kill $node0
//
package main
import (
"fmt"
"os"
"nanomsg.org/go-mangos"
"nanomsg.org/go-mangos/protocol/pull"
"nanomsg.org/go-mangos/protocol/push"
"nanomsg.org/go-mangos/transport/ipc"
"nanomsg.org/go-mangos/transport/tcp"
)
func die(format string, v ...interface{}) {
fmt.Fprintln(os.Stderr, fmt.Sprintf(format, v...))
os.Exit(1)
}
func node0(url string) {
var sock mangos.Socket
var err error
var msg []byte
if sock, err = pull.NewSocket(); err != nil {
die("can't get new pull socket: %s", err)
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Listen(url); err != nil {
die("can't listen on pull socket: %s", err.Error())
}
for {
// Could also use sock.RecvMsg to get header
msg, err = sock.Recv()
fmt.Printf("NODE0: RECEIVED \"%s\"\n", msg)
}
}
func node1(url string, msg string) {
var sock mangos.Socket
var err error
if sock, err = push.NewSocket(); err != nil {
die("can't get new push socket: %s", err.Error())
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Dial(url); err != nil {
die("can't dial on push socket: %s", err.Error())
}
fmt.Printf("NODE1: SENDING \"%s\"\n", msg)
if err = sock.Send([]byte(msg)); err != nil {
die("can't send message on push socket: %s", err.Error())
}
sock.Close()
}
func main() {
if len(os.Args) > 2 && os.Args[1] == "node0" {
node0(os.Args[2])
os.Exit(0)
}
if len(os.Args) > 3 && os.Args[1] == "node1" {
node1(os.Args[2], os.Args[3])
os.Exit(0)
}
fmt.Fprintf(os.Stderr,
"Usage: pipeline node0|node1 <URL> <ARG> ...\n")
os.Exit(1)
}