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import os |
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BASE_DIR = os.path.dirname(os.path.realpath(__file__)) |
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import time |
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import json |
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import select |
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import traceback |
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import socket |
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from multiprocessing import Process, Pipe |
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import gevent |
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from gevent.pywsgi import WSGIServer |
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from geventwebsocket.handler import WebSocketHandler |
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from flask import Flask, request, render_template, abort |
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def log_important_msg(msg, *, padding=3): |
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msg_len = len(msg) |
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width = msg_len + padding * 2 + 2 |
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print('#' * width) |
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print('#' + ' ' * (width - 2) + '#') |
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print('#' + ' ' * padding + msg + ' ' * padding + '#') |
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print('#' + ' ' * (width - 2) + '#') |
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print('#' * width) |
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def hint_url(url, port): |
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log_important_msg( |
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'The server is running at: {}'.format(url)) |
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def _set_server(conn, name='webcv2', port=7788): |
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package = None |
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package_alive = False |
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app = Flask(name) |
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app.root_path = BASE_DIR |
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@app.route('/') |
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def index(): |
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return render_template('index.html', title=name) |
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@app.route('/stream') |
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def stream(): |
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def poll_ws(ws, delay): |
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return len(select.select([ws.stream.handler.rfile], [], [], delay / 1000.)[0]) > 0 |
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if request.environ.get('wsgi.websocket'): |
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ws = request.environ['wsgi.websocket'] |
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if ws is None: |
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abort(404) |
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else: |
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should_send = True |
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while not ws.closed: |
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global package |
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global package_alive |
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if conn.poll(): |
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package = conn.recv() |
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package_alive = True |
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should_send = True |
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if not should_send: |
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continue |
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should_send = False |
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if package is None: |
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ws.send(None) |
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else: |
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delay, info_lst = package |
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ws.send(json.dumps((time.time(), package_alive, delay, info_lst))) |
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if package_alive: |
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if delay <= 0 or poll_ws(ws, delay): |
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message = ws.receive() |
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if ws.closed or message is None: |
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break |
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try: |
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if isinstance(message, bytes): |
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message = message.decode('utf8') |
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message = int(message) |
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except: |
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traceback.print_exc() |
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message = -1 |
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else: |
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message = -1 |
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conn.send(message) |
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package_alive = False |
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return "" |
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http_server = WSGIServer(('', port), app, handler_class=WebSocketHandler) |
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hint_url('http://{}:{}'.format(socket.getfqdn(), port), port) |
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http_server.serve_forever() |
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def get_server(name='webcv2', port=7788): |
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conn_server, conn_factory = Pipe() |
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p_server = Process( |
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target=_set_server, |
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args=(conn_server,), |
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kwargs=dict( |
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name=name, port=port, |
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), |
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) |
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p_server.daemon = True |
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p_server.start() |
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return p_server, conn_factory |
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