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[英]How can I communicate with an already running Linux process in Python?
[英]How can I communicate between running python code and nodejs
我想运行一些python代码并与nodejs express服务器通信。 到目前为止,我可以让我的nodejs服务器通过两种机制之一来调用python函数,要么生成python任务,要么让它与zerorpc python服务器通信。
第一个是http://www.sohamkamani.com/blog/2015/08/21/python-nodejs-comm/ ,这有效:
var express = require( "express" );
var http = require( "http" );
var app = express();
var server = http.createServer( app ).listen( 3000 );
var io = require( "socket.io" )( server );
app.use( express.static( "./public" ) );
io.on( "connection", function( socket ) {
// Repeat interval is in milliseconds
setInterval( function() {
var spawn = require( 'child_process' ).spawn,
py = spawn( 'python', [ 'mytime.py' ] ),
message = '';
py.stdout.on( 'data', function( data ) {
message += data.toString();
});
py.stdout.on( 'end', function() {
socket.emit( "message", message );
});
}, 50 );
});
mytime.py在哪里
from datetime import datetime
import sys
def main():
now = datetime.now()
sys.stdout.write( now.strftime( "%-d %b %Y %H:%M:%S.%f" ) )
并使用zerorpc http://www.zerorpc.io/ ,如果此python代码正在运行:
from datetime import datetime
import sys
import zerorpc
class MyTime( object ):
def gettime( self ):
now = datetime.now()
return now.strftime( "%-d %b %Y %H:%M:%S.%f" )
s = zerorpc.Server( MyTime() )
s.bind( "tcp://0.0.0.0:4242" )
s.run()
这个nodejs代码有效:
var express = require( "express" );
var http = require( "http" );
var app = express();
var server = http.createServer( app ).listen( 3000 );
var io = require( "socket.io" )( server );
var zerorpc = require( "zerorpc" );
var client = new zerorpc.Client();
client.connect( "tcp://127.0.0.1:4242" );
app.use( express.static( "./public" ) );
io.on( "connection", function( socket ) {
// Repeat interval is in milliseconds
setInterval( function() {
client.invoke( "gettime", function( error, res, more ) {
socket.emit( "message", res.toString( 'utf8' ) );
} );
}, 50 );
});
但我想要做的不是只调用python函数,我想要一个单独的python进程运行并向nodejs服务器发送消息,该服务器侦听它们然后处理它们。 我已经尝试过中间件socketio-wildcard,但是如果我尝试在与nodejs express服务器相同的端口上设置一个zerorpc的python服务器,它会给出一个zmq.error.ZMQError:地址已经在使用中 。
我知道我没有考虑到这一点 - 我知道由于我在这里的天真,我错过了一些关于进程间通信的逻辑 - 所以如果有更好的方法从一个带有nodejs的python进程发送消息服务器听,我都是耳朵。
有任何想法吗?
提前谢谢了!
对于那些想要解决这个问题的人来说,这是Zeke Alexandre Nierenberg的解决方案
对于node.js服务器代码:
var express = require( "express" );
var app = express();
var http = require( "http" );
app.use( express.static( "./public" ) ); // where the web page code goes
var http_server = http.createServer( app ).listen( 3000 );
var http_io = require( "socket.io" )( http_server );
http_io.on( "connection", function( httpsocket ) {
httpsocket.on( 'python-message', function( fromPython ) {
httpsocket.broadcast.emit( 'message', fromPython );
});
});
以及发送消息的python代码:
from datetime import datetime
from socketIO_client import SocketIO, LoggingNamespace
import sys
while True:
with SocketIO( 'localhost', 3000, LoggingNamespace ) as socketIO:
now = datetime.now()
socketIO.emit( 'python-message', now.strftime( "%-d %b %Y %H:%M:%S.%f" ) )
socketIO.wait( seconds=1 )
瞧!
我在socketIO版本上遇到了一些问题......
所以,这是我的解决方案:
的NodeJS:
var app = require("express")();
var http = require('http').Server(app);
var bodyParser = require('body-parser');
app.use(bodyParser.json())
app.post('/',function(req,res){
var msg=req.body.msg;
console.log("python: " + msg);
});
http.listen(3000, function(){
console.log('listening...');
});
在Python上:
import requests
import json
url = "http://localhost:3000"
data = {'msg': 'Hi!!!'}
headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}
r = requests.post(url, data=json.dumps(data), headers=headers)
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