python - 如何在 Python 中创建 Socket.io 客户端以与 Sails 服务器通信

coder 2023-08-21 原文

我正在运行一个 SailsJS 实例 (v0.12.3)，我有一个 Controller MyModelController 处理 WebSocket (socket.io)如果用户已通过身份验证，则允许的连接。

我的模型 Controller

module.exports = {
    /**
     * Socket connection
     */
    connect: function(req, res) {
      /* Checks it's a socket connection request */
      if (!req.isSocket) { return res.badRequest();}

      /* Checks it's authenticated */
      if (req.session.me) {
        User.findOne(req.session.me, function (err, me) {
          if (req.param('name')) {

            MyModel.findOne({
              name: req.param('name')
            }).exec(function(err, objectFound) {

              /* e.g. Join a room named after the params passed */
              sails.sockets.join(req, objectFound.name); 

              return res.ok({ message: "All is OK!"}});
            });
          } 
        });
      }
    }
}

从 SailsJS 提供的页面，例如myPage.ejs，效果很好:

<!DOCTYPE html>
<html>
<head>...</head>
<body>
    ...
    <script src="/js/dependencies/sails.io.js"></script>
    <script src="/js/dependencies/app.io.js"></script>
    <script src="/vendor/jquery/jquery.min.js"></script>
    <script type "text/javascript">
       // Use .get() to contact the server
       io.socket.get('/myModel/connect?name=john', function gotResponse(body, response) {
         console.log('Status code ' + response.statusCode + ' & data: ', body);
       });
    </script>
</body>
</html>

如何从 Python 客户端连接到 SailsJS socket.io 服务器？

在最初的几次尝试中，我试图将身份验证部分留到以后再做。这么说吧，我们现在不必担心它。

我安装了一个 Python socket.io 客户端 pip install socketIO-client-2 请参阅 socketIO-client-2 doc .

对于初学者来说，尝试了这个(哦，顺便说一句，我正在使用带有自签名证书的安全连接):

from socketIO_client import SocketIO

SocketIO('https://localhost:1337/myModel/connect', params={'name': 'john'}, verify=False)

但随后我在 Sails 服务器端立即收到错误:

verbose: Sending 400 ("Bad Request") response

客户端出错

Failed to establish a new connection: [Errno 61] Connection refused

所以我把socket连接请求和鉴权检查都注释掉了，为了更简单，希望能搞清楚...

connect: function(req, res) {

  if (req.param('name')) {
    MyModel.findOne({
      name: req.param('name')
    }).exec(function(err, objectFound) {
      console.log(req.socket.id);
      console.log(param('name'));
      sails.sockets.join(req, objectFound.name); 

      return res.ok({ message: "All is OK!"}});
    });
  } else {
    console.log('No params passed to the websocket');
  }
}

这让我在 Sails 方面:

connect > found object: { name: 'john',
  id: 1,
  createdAt: '2016-11-04T15:20:38.000Z',
  updatedAt: '2016-11-04T15:20:38.000Z' }
Socket request undefined        <============== UNDEFINED
warn: Attempted to call `sailsSockets.join`, but the first argument was not a socket.
Socket Id: undefined

我的 Python 日志:

    /usr/local/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py:843: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
Traceback (most recent call last):
  File "wsclient.py", line 17, in <module>
    SocketIO('https://localhost:1337/myModel/connect', params={'name': 'john'}, verify=False)
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/__init__.py", line 334, in __init__
    resource, hurry_interval_in_seconds, **kw)
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/__init__.py", line 51, in __init__
    self._transport
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/__init__.py", line 59, in _transport
    self._engineIO_session = self._get_engineIO_session()
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/__init__.py", line 73, in _get_engineIO_session
    transport.recv_packet())
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/transports.py", line 81, in recv_packet
    for engineIO_packet in decode_engineIO_content(response.content):
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/parsers.py", line 95, in decode_engineIO_content
    content, content_index)
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/parsers.py", line 202, in _read_packet_length
    while get_byte(content, content_index) not in [0, 1]:
  File "/usr/local/lib/python2.7/site-packages/socketIO_client/symmetries.py", line 28, in get_byte
    return six.indexbytes(x, index)
  File "/usr/local/lib/python2.7/site-packages/six.py", line 655, in indexbytes
    return ord(buf[i])
IndexError: string index out of range

有什么建议吗？

INTERESTING LINKS:

how-to-connect-socket-io-client-to-sails-js-server, but that's using NodeJS

sails.io.js for nodejs

当NodeJS + sails.io.js

我想我想实现这个，但是在 python 中

var socketIOClient = require('socket.io-client');
var sailsIOClient = require('sails.io.js');

// Instantiate the socket client (`io`)
// (for now, you must explicitly pass in the socket.io client when using this library from Node.js)
var io = sailsIOClient(socketIOClient);

// Set some options:
// (you have to specify the host and port of the Sails backend when using this library from Node.js)
io.sails.url = 'http://localhost:1337';
// ...

// Send a GET request to `http://localhost:1337/hello`:
io.socket.get('/hello', function serverResponded (body, JWR) {
  // body === JWR.body
  console.log('Sails responded with: ', body);
  console.log('with headers: ', JWR.headers);
  console.log('and with status code: ', JWR.statusCode);

  // When you are finished with `io.socket`, or any other sockets you connect manually,
  // you should make sure and disconnect them, e.g.:
  io.socket.disconnect();

  // (note that there is no callback argument to the `.disconnect` method)
});

连接时给出此日志

$ DEBUG=* node sio-client.js 

  socket.io-client:url parse https://localhost:1337 +0ms
  socket.io-client new io instance for https://localhost:1337 +5ms
  socket.io-client:manager readyState closed +3ms
  socket.io-client:manager opening https://localhost:1337 +0ms
  engine.io-client:socket creating transport "websocket" +1ms
  engine.io-client:socket setting transport websocket +29ms
  socket.io-client:manager connect attempt will timeout after 20000 +0ms
  socket.io-client:manager readyState opening +7ms
  engine.io-client:socket socket receive: type "open", data "{"sid":"hj4FCwhk_pQ3hoTbAAAE","upgrades":[],"pingInterval":25000,"pingTimeout":60000}" +17ms
  engine.io-client:socket socket open +0ms
  socket.io-client:manager open +0ms
  socket.io-client:manager cleanup +1ms
  socket.io-client:socket transport is open - connecting +0ms
  engine.io-client:socket socket receive: type "message", data "0" +215ms
  socket.io-parser decoded 0 as {"type":0,"nsp":"/"} +0ms
  socket.io-client:socket emitting packet with ack id 0 +3ms
  socket.io-client:manager writing packet {"type":2,"data":["get",{"method":"get","headers":{},"data":{},"url":"/mymodel/connect?name=john"}],"options":{"compress":true},"id":0,"nsp":"/"} +0ms
  socket.io-parser encoding packet {"type":2,"data":["get",{"method":"get","headers":{},"data":{},"url":"/mymodel/connect?name=john"}],"options":{"compress":true},"id":0,"nsp":"/"} +2ms
  socket.io-parser encoded {"type":2,"data":["get",{"method":"get","headers":{},"data":{},"url":"/mymodel/connect?name=john"}],"options":{"compress":true},"id":0,"nsp":"/"} as 20["get",{"method":"get","headers":{},"data":{},"url":"/mymodel/connect?name=john"}] +0ms
  engine.io-client:socket flushing 1 packets in socket +1ms


  |>    Now connected to Sails.
\___/   For help, see: http:
        (using sails.io.js node SDK @v1.1.0)



  engine.io-client:socket socket receive: type "message", data "30[{"body":{"mymodel":{"name":"john","id":1,"createdAt":"2016-11-04T15:20:38.000Z","updatedAt":"2016-11-04T15:20:38.000Z","assembly":"drive"},"message":"DRIVE, Joined room john"},"headers":{"Access-Control-Allow-Origin":"","Access-Control-Allow-Credentials":"","Access-Control-Allow-Methods":"","Access-Control-Allow-Headers":"","Access-Control-Expose-Headers":"","access-control-allow-origin":"","access-control-allow-credentials":"","access-control-allow-methods":"","access-control-allow-headers":"","access-control-expose-headers":""},"statusCode":200}]" +242ms
  socket.io-parser decoded 30[{"body":{"mymodel":{"name":"john","id":1,"createdAt":"2016-11-04T15:20:38.000Z","updatedAt":"2016-11-04T15:20:38.000Z","assembly":"drive"},"message":"DRIVE, Joined room john"},"headers":{"Access-Control-Allow-Origin":"","Access-Control-Allow-Credentials":"","Access-Control-Allow-Methods":"","Access-Control-Allow-Headers":"","Access-Control-Expose-Headers":"","access-control-allow-origin":"","access-control-allow-credentials":"","access-control-allow-methods":"","access-control-allow-headers":"","access-control-expose-headers":""},"statusCode":200}] as {"type":3,"nsp":"/","id":0,"data":[{"body":{"mymodel":{"name":"john","id":1,"createdAt":"2016-11-04T15:20:38.000Z","updatedAt":"2016-11-04T15:20:38.000Z","assembly":"drive"},"message":"DRIVE, Joined room john"},"headers":{"Access-Control-Allow-Origin":"","Access-Control-Allow-Credentials":"","Access-Control-Allow-Methods":"","Access-Control-Allow-Headers":"","Access-Control-Expose-Headers":"","access-control-allow-origin":"","access-control-allow-credentials":"","access-control-allow-methods":"","access-control-allow-headers":"","access-control-expose-headers":""},"statusCode":200}]} +244ms
  socket.io-client:socket calling ack 0 with [{"body":{"mymodel":{"name":"john","id":1,"createdAt":"2016-11-04T15:20:38.000Z","updatedAt":"2016-11-04T15:20:38.000Z","assembly":"drive"},"message":"DRIVE, Joined room john"},"headers":{"Access-Control-Allow-Origin":"","Access-Control-Allow-Credentials":"","Access-Control-Allow-Methods":"","Access-Control-Allow-Headers":"","Access-Control-Expose-Headers":"","access-control-allow-origin":"","access-control-allow-credentials":"","access-control-allow-methods":"","access-control-allow-headers":"","access-control-expose-headers":""},"statusCode":200}] +1ms
hello again
Sails responded with:  { mymodel: 
   { name: 'john',
     id: 1,
     createdAt: '2016-11-04T15:20:38.000Z',
     updatedAt: '2016-11-04T15:20:38.000Z',
     assembly: 'drive' },
  message: 'DRIVE, Joined room john' }
with headers:  { 'Access-Control-Allow-Origin': '',
  'Access-Control-Allow-Credentials': '',
  'Access-Control-Allow-Methods': '',
  'Access-Control-Allow-Headers': '',
  'Access-Control-Expose-Headers': '',
  'access-control-allow-origin': '',
  'access-control-allow-credentials': '',
  'access-control-allow-methods': '',
  'access-control-allow-headers': '',
  'access-control-expose-headers': '' }
and with status code:  200

注意是写包

 {  
   "type":2,
   "data":[  
      "get",
      {  
         "method":"get",
         "headers":{},
         "data":{},
         "url":"/myModel/connect?name=john"
      }
   ],
   "options":{  
      "compress":true
   },
   "id":0,
   "nsp":"/"
}

尝试副作用的建议

这里是我运行的代码pastebin

在 Sails 方面

verbose: Could not fetch session, since connecting socket has no cookie (is this a cross-origin socket?)
Generated a one-time-use cookie:sails.sid=s%3AR-Sm_JeWKoqayZOku-EvxPR_uUpilwVU.3yRUVjmYSpCl%2BeT4sJIOH%2BUTOL3EjWFabDKbswSlkdIand saved it on the socket handshake.
This will start this socket off with an empty session, i.e. (req.session === {})
That "anonymous" section will only last until the socket is disconnected unless you persist the session id in your database,
or by setting the set-cookie response header for an HTTP request that you *know* came from the same user (etc)
Alternatively, just make sure the socket sends a `cookie` header or query param when it initially connects.

在 socket.io python 客户端调试信息:

/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:334: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  SNIMissingWarning
/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:132: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/connectionpool.py:843: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  InsecureRequestWarning)
DEBUG:root:192.168.178.20:1337/socket.io [transport selected] websocket
DEBUG:root:192.168.178.20:1337/socket.io [heartbeat reset]
DEBUG:root:192.168.178.20:1337/socket.io [socket.io packet sent] 21["get", {"url": "/path/connect", "headers": {}, "data": {"name": "john"}, "method": "get"}]
DEBUG:root:192.168.178.20:1337/socket.io [socket.io packet received] 0

最佳答案

您似乎需要一些时间来围绕给定的 Socketio 库创建一个 sails.io.js 兼容性 python 包装器。所以我想在阅读客户端库的源代码时分享实现。

这里的 sails.io.js 库是做什么的，它将 .get、.post、.put 对通过发送以下数据的 socketio 客户端的请求起作用。

用http://localhost:1337初始化socketio客户端库

将数据作为字典传递给 emit 函数，如下所述，

常见的emit数据结构是

emit_data = {

        'method' : 'get', #  get, post, delete depends on requirement

        'headers' : {'header_key': 'header_value'}, # for passing headers

         'data': {'key': 'value'},  # for sending /search/?q=hello, {'q': 'hello'}

         'url': '/hello' # 
}

如果您需要将最后一个 nodejs 片段转换为这个 client作为

import requests
from socketIO_client import SocketIO

def server_responded(*body):
    print 'response', body

# first we need to get cookie headers for connection
r = requests.get('localhost:1337/__getcookie/')
emit_data = {
  'method' : 'get',
  'url': '/hello',
  'headers': {'Cookie': r.headers['Set-Cookie']},
} 
# update emit_data with extra headers if needed

with SocketIO('localhost', 1337) as socketIO:
    # note: event parameter is request method, here get for GET
    # second parameter is emit_data structured as described above
    socketIO.emit(emit_data['method'], emit_data, server_responded)
    # adjust with your requirements
    socketIO.wait_for_callbacks(seconds=1)

关于python - 如何在 Python 中创建 Socket.io 客户端以与 Sails 服务器通信，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40949932/

中创何在 34 socket 39 python node.js socket.io sails.js

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