codelab-message-pub系统命令

安装完codelab_adapter_client之后,将生成codelab-message-pub系统命令, 它方便用来将CodeLab Adapter与其他编程语言做集成,我们展示了与30+种编程语言结合的例子。

Unix/Linux操作系统仅仅使用信号(signal)便能构建非常复杂的协同程序。Erlang从SmallTalk那儿学到仅使用message来协同程序,message是个极其强大的概念。

CodeLab Adapter的核心设计思路是: Everything Is Message(EIM), 我们在最新的codelab_adapter_client版本中,为其加入系统命令,方便在其他语言构建的程序中往CodeLab Adapter发送消息,这样一来,你就可以使用任何编程语言为Scratch构建插件,或者为CodeLab Adapter构建插件。

典型使用案例:

在CodeLab内部,我们的魔杖程序(使用魔杖控制空间里的事物)的机器视觉(CV)部分是使用C++写的(因为深度相机的C++ SDK比较完备),为了让深度相机与Scratch协同工作,codelab-message-pub便是理想的选择,它能够将消息的触角延伸到任何编程语言里。

codelab-message-pub

安装

pip install codelab_adapter_client

使用帮助

> codelab-message-pub -h
usage: codelab-message-pub [-h] [-i CODELAB_ADAPTER_IP_ADDRESS] [-n NAME]
                           [-p PUBLISHER_PORT] [-s SUBSCRIBER_PORT] [-t TOPIC]
                           [-c CONTENT] [-j JSON_MESSAGE]

optional arguments:
  -h, --help            show this help message and exit
  -i CODELAB_ADAPTER_IP_ADDRESS
                        None or IP address used by CodeLab Adapter
  -n NAME               Set name in banner
  -p PUBLISHER_PORT     Publisher IP port
  -s SUBSCRIBER_PORT    Subscriber IP port
  -t TOPIC              message topic
  -c CONTENT            payload['content']
  -j JSON_MESSAGE       json message(with topic and payload)

使用方法

> codelab-message-pub -t hello_topic
> codelab-message-pub -c hello_content
> codelab-message-pub -j '{"topic":"eim/test","payload":{"content":"test contenst"}}'

使用codelab-message-pub时记得先打开CodeLab Adapter。

支持语言

以下是我们给出的主流/非主流编程语言与codelab-message-pub集成的范例,本质上是系统调用。

部分编程语言使用labstack测试。

C++

#include <stdio.h>
#include <stdlib.h>
int main()
{
    system("codelab-message-pub -c hello_content");
}

Rust

// https://doc.rust-lang.org/book/ch01-02-hello-world.html
// https://doc.rust-lang.org/std/process/struct.Command.html
// https://stackoverflow.com/questions/21011330/how-do-i-invoke-a-system-command-in-rust-and-capture-its-output
use std::process::Command;
fn main() {
    Command::new("codelab-message-pub")
        .arg("-c")
        .arg("hello_content")
        .spawn()
        .expect("command failed");
}
rustc main.rs
./main

Golang

// https://golang.org/pkg/os/exec/
// https://tutorialedge.net/golang/executing-system-commands-with-golang/
package main

import (
    "fmt"
    "os/exec"
    "runtime"
)

func execute() {
    out, err := exec.Command("codelab-message-pub", "-c","hello_content").Output()
    if err != nil {
        fmt.Printf("%s", err)
    }
    fmt.Println("Command Successfully Executed")
    output := string(out[:])
    fmt.Println(output)
}

func main() {
    if runtime.GOOS == "windows" {
        fmt.Println("Can't Execute this on a windows machine")
    } else {
        execute()
    }
}
go run main.go

swift

//https://stackoverflow.com/questions/26971240/how-do-i-run-an-terminal-command-in-a-swift-script-e-g-xcodebuild
import Foundation

@discardableResult
func shell(_ args: String...) -> Int32 {
    let task = Process()
    task.launchPath = "/usr/bin/env"
    task.arguments = args
    task.launch()
    task.waitUntilExit()
    return task.terminationStatus
}

shell("codelab-message-pub", "-c","hello_content")

c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main () {
   char command[50];

   strcpy( command, "codelab-message-pub -c hello_content" );
   system(command);

   return(0);
} 

bash

codelab-message-pub -c hello_content

Racket

(system "codelab-message-pub -c hello_content")

Scheme

(system "codelab-message-pub -c hello_content")

Elisp(Emacs)

(shell-command "codelab-message-pub -c hello_content")

Hy

(import subprocess)
(.call subprocess ["codelab-message-pub" "-c" "hello_content"])

SmallTalk(Pharo)

command := OSProcess waitForCommand: 'codelab-message-pub -c hello_content'.
command exitStatus.

Haskell

module Main where

import System.Process

main = callCommand "codelab-message-pub -c hello_content"

MATLAB

% https://www.mathworks.com/help/matlab/ref/system.html
system("codelab-message-pub -c hello_content")

Julia

run(`codelab-message-pub -c hello_content`)

Lua

os.execute("codelab-message-pub -c hello_content")

Perl

system("codelab-message-pub -c hello_content")

PHP

<?php
  system("codelab-message-pub -c hello_content"); 
?>

Dart

import 'dart:io';

main() {
  Process.run('codelab-message-pub', ['-c', 'hello_content']);
}

R

system("codelab-message-pub -c hello_content")

Ruby

system("codelab-message-pub -c hello_content")

Crystal

system "codelab-message-pub -c hello_content"

Python

import subprocess
subprocess.call(["codelab-message-pub -c hello_content"], shell=True)

JavaScript(NodeJS)

const {execSync} = require('child_process');
execSync('codelab-message-pub -c hello_content');

Prolog

shell('codelab-message-pub -c hello_content').

Erlang

!/usr/bin/env escript

main(_) ->
  output = os:cmd("codelab-message-pub -c hello_content"),
  io:fwrite(output).

Java

Runtime r = Runtime.getRuntime();
Process p = r.exec("codelab-message-pub -c hello_content");
p.waitFor();

Kotlin

the same as Java

Clojure

(use '[clojure.java.shell :only [sh]])
(sh "codelab-message-pub"  "-c" "hello_content")

Scala

import sys.process._
val cmd = "codelab-message-pub -c hello_content"
val output = cmd.! // Captures the output

Groovy

"codelab-message-pub -c hello_content".execute()

Processing

// https://forum.processing.org/two/discussion/24401/how-can-i-run-a-command-in-terminal-from-within-processing
exec("codelab-message-pub", "-c","hello_content");

Fortran

CALL execute_command_line('codelab-message-pub -c hello_content') 

Ada

-- https://www.pegasoft.ca/resources/boblap/13.html
function system( cmd : string ) returns integer;
pragma Import( C, system );
Result := system( "codelab-message-pub -c hello_content" & ASCII.NUL );

Brainfuck

ref : https://kimiyuki.net/blog/2016/04/01/bash-on-brainfuck-on-anarchy-golf/

C#

// https://docs.microsoft.com/en-us/dotnet/core/tutorials/using-with-xplat-cli
// https://kimsereyblog.blogspot.com/2018/01/start-processes-from-c-in-dotnet-core.html
// https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-run?tabs=netcore21#examples

Pascal

ref :https://wiki.freepascal.org/Executing_External_Programs

Assembly

ref: https://stackoverflow.com/questions/9342410/sys-execve-system-call-from-assembly

SQL

ref: https://stackoverflow.com/questions/43205594/running-system-command-with-argument-in-a-postgresql-function