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