我试图通过websockets设置一个公共Twitter流的小例子。这是我的websocket.py,它正在运作。
我想知道的是:我如何与来自' outside'以外的websocket交互?类WSHandler(即不仅在从websocket.js接收消息时回答)?假设我想在同一个脚本中运行一些其他函数来发布"你好!"每隔五秒钟将其发送到websocket(浏览器),而无需客户端的任何交互。我怎么能这样做?
因此,我认为,这是一个基本的初学者问题,关于如何处理下面的课程。任何方向的任何指针将不胜感激!
import os.path
import tornado.httpserver
import tornado.websocket
import tornado.ioloop
import tornado.web
# websocket
class FaviconHandler(tornado.web.RequestHandler):
def get(self):
self.redirect('/static/favicon.ico')
class WebHandler(tornado.web.RequestHandler):
def get(self):
self.render("websockets.html")
class WSHandler(tornado.websocket.WebSocketHandler):
def open(self):
print 'new connection'
self.write_message("Hi, client: connection is made ...")
def on_message(self, message):
print 'message received: \"%s\"' % message
self.write_message("Echo: \"" + message + "\"")
if (message == "green"):
self.write_message("green!")
def on_close(self):
print 'connection closed'
handlers = [
(r"/favicon.ico", FaviconHandler),
(r'/static/(.*)', tornado.web.StaticFileHandler, {'path': 'static'}),
(r'/', WebHandler),
(r'/ws', WSHandler),
]
settings = dict(
template_path=os.path.join(os.path.dirname(__file__), "static"),
)
application = tornado.web.Application(handlers, **settings)
if __name__ == "__main__":
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
tornado.ioloop.IOLoop.instance().start()
答案 0 :(得分:19)
你可以打电话给
IOLoop.add_timeout(deadline, callback)
在指定的截止时间超时(一次拍摄,但您可以重新安排)调用回调,或使用
tornado.ioloop.PeriodicCallback
如果你有更周期性的任务。
请参阅:http://www.tornadoweb.org/en/stable/ioloop.html#tornado.ioloop.IOLoop.add_timeout
更新:某些示例
import datetime
def test():
print "scheduled event fired"
...
if __name__ == "__main__":
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
main_loop = tornado.ioloop.IOLoop.instance()
# Schedule event (5 seconds from now)
main_loop.add_timeout(datetime.timedelta(seconds=5), test)
# Start main loop
main_loop.start()
在5秒后调用test()
。
更新2:
import os.path
import tornado.httpserver
import tornado.websocket
import tornado.ioloop
import tornado.web
# websocket
class FaviconHandler(tornado.web.RequestHandler):
def get(self):
self.redirect('/static/favicon.ico')
class WebHandler(tornado.web.RequestHandler):
def get(self):
self.render("websockets.html")
class WSHandler(tornado.websocket.WebSocketHandler):
def open(self):
print 'new connection'
self.write_message("Hi, client: connection is made ...")
tornado.ioloop.IOLoop.instance().add_timeout(datetime.timedelta(seconds=5), self.test)
def on_message(self, message):
print 'message received: \"%s\"' % message
self.write_message("Echo: \"" + message + "\"")
if (message == "green"):
self.write_message("green!")
def on_close(self):
print 'connection closed'
def test(self):
self.write_message("scheduled!")
handlers = [
(r"/favicon.ico", FaviconHandler),
(r'/static/(.*)', tornado.web.StaticFileHandler, {'path': 'static'}),
(r'/', WebHandler),
(r'/ws', WSHandler),
]
settings = dict(
template_path=os.path.join(os.path.dirname(__file__), "static"),
)
application = tornado.web.Application(handlers, **settings)
import datetime
if __name__ == "__main__":
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
tornado.ioloop.IOLoop.instance().start()
答案 1 :(得分:14)
wss = []
class wsHandler(tornado.websocket.WebSocketHandler):
def open(self):
print 'Online'
if self not in wss:
wss.append(self)
def on_close(self):
print 'Offline'
if self in wss:
wss.remove(self)
def wsSend(message):
for ws in wss:
ws.write_message(message)
要向您的websockets发送消息,只需使用:
wsSend(message)
wsSend update
我偶尔会遇到wsSend异常。为了解决这个问题,我将代码修改为以下内容:
def wsSend(message): for ws in wss: if not ws.ws_connection.stream.socket: print "Web socket does not exist anymore!!!" wss.remove(ws) else: ws.write_message(message)
答案 2 :(得分:1)