https://github.com/eldarion-gondor/piper

websocket process communication
https://github.com/eldarion-gondor/piper

Last synced: 11 days ago
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websocket process communication

• Host: GitHub
• URL: https://github.com/eldarion-gondor/piper
• Owner: eldarion-gondor
• License: apache-2.0
• Created: 2015-01-19T20:57:12.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2016-05-29T18:56:13.000Z (over 8 years ago)
• Last Synced: 2024-08-02T14:08:39.237Z (4 months ago)
• Language: Go
• Size: 77.1 KB
• Stars: 7
• Watchers: 9
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# piper

piper is a small library to aide in running a process locally, but actually run it remotely over a WebSocket connection.

Here is an example of its usage in a tool used on Gondor:

	package main

	import (

		"flag"

		"fmt"

		"log"

		"net/http"

		"os"

		"os/exec"

		"strings"

		"github.com/eldarion-gondor/piper"

		"github.com/gorilla/websocket"

	)

	var secret = flag.String("secret", "", "")

	var buildSHA string

	var upgrader = websocket.Upgrader{

		ReadBufferSize:  8192,

		WriteBufferSize: 8192,

	}

	func main() {

		flag.Parse()

		if len(flag.Args()) == 0 {

			fmt.Println("no program to exec")

			os.Exit(1)

		}

		done := make(chan bool)

		http.HandleFunc("/ok", func(rw http.ResponseWriter, req *http.Request) {

			rw.WriteHeader(http.StatusOK)

		})

		http.HandleFunc("/", func(rw http.ResponseWriter, req *http.Request) {

			defer func() { done <- true }()

			log.Println("connection recieved")

			ws, err := upgrader.Upgrade(rw, req, nil)

			if err != nil {

				log.Printf("upgrade error: %s", err)

				return

			}

			log.Println("upgraded to websockets; ready to pipe")

			pipe, err := piper.NewServerPipe(req, ws)

			if err != nil {

				log.Printf("pipe error: %s", err)

				ws.Close()

				return

			}

			log.Printf("exec: %s", strings.Join(flag.Args(), " "))

			cmd := exec.Command(flag.Arg(0), flag.Args()[1:]...)

			if err := pipe.RunCmd(cmd); err != nil {

				log.Printf("exec error: %s", err)

				pipe.Close("error")

				return

			}

		})

		go func() {

			if err := http.ListenAndServe(":8000", nil); err != nil {

				fmt.Println(err)

				os.Exit(1)

			}

		}()

		<-done

	}

This program will start an HTTP server and expose a process via a WebSocket connection.