我目前正在尝试使用Tornado的Web套接字处理程序在每次调用某个函数时更新仪表板。这是处理程序:
class WebSocketHandler(websocket.WebSocketHandler):
clients = []
def open(self):
logging.info("WEBSOCKET OPEN")
WebSocketHandler.clients.append(self)
def on_message(self, message):
logging.info("message from websocket recieved")
self.write_message("WebSocket connected")
def on_close(self):
logging.info("WEBSOCKET closed")
这是客户端脚本,它在加载时连接WebSocket:
function WebSocketTest()
{ var ws = 0;
ws = new WebSocket("ws://localhost:8008/WEB");
ws.onopen = function()
{
ws.send("initial connect")
}
ws.onmessage = function (evt)
{
console.log(evt.data)
};
ws.onclose = function()
{
console.log("closed ");
};
}
websockets连接成功。
我需要从write_message
拨打WebSocketHandler
,但我很困惑它的实例是什么?我一直遇到的错误是self isn't defined
,但我不确定自己到底是什么?我知道只要客户端尝试加载WebSocketHandler
^/WEB$
编辑:这是我的server.py
文件,我需要在spawn callback
itercheckers
电话后立即拨打write_message
class Server():
@classmethod
def run(cls):
options.parse_command_line()
# Start web
template_path = os.path.join(os.path.dirname(__file__), 'templates')
jinja2loader = Jinja2Loader(template_path)
kwargs = dict(
template_loader=jinja2loader,
static_path=os.path.join(os.path.dirname(__file__), 'static'),
debug=True,
login_url="/auth/login",
cookie_secret="dn470h8yedWF9j61BJH2aY701i6UUexx"
)
app = web.Application(handlers, **kwargs).listen(
configuration['server']['port'],)
# Reset events
@gen.coroutine
def reset(parent=None):
if parent is None:
parent = configuration
# Reset event happyness
yield events.reset_happy(parent)
# Read last status
data = yield events.get(parent)
# Read and set happy from the last status
happy = (data or {}).get('status', events.STATUS_OK) \
in events.HAPPY
yield events.set_happy(parent, happy)
# Iterate sub-events
for event in parent['events']:
yield reset(event)
ioloop.IOLoop.current().run_sync(reset)
# Start checkers
def itercheckers(parent):
index = 0
for event in parent.get('events', []):
if 'checker' in event:
checker = event['checker']
p, m = checker['class'].rsplit('.', 1)
ioloop.IOLoop.current().spawn_callback(
getattr(importlib.import_module(p), m)(
event=event,
frequency=checker.get('frequency', 1),
params=checker['params']
).run)
index += 1
itercheckers(event)
itercheckers(configuration)
# Start alerts
ioloop.IOLoop.current().run_sync(alerts.reset)
for alert in configuration['alerts']:
p, m = alert['class'].rsplit('.', 1)
ioloop.IOLoop.current().spawn_callback(
getattr(importlib.import_module(p), m)(
alert=alert
).run
)
# Start loop
ioloop.IOLoop.current().start()
答案 0 :(得分:0)
首先,self
关键字指向当前处理的当前websocket客户端。要使用tornado websockets,您必须初始化tornado app
app = web.Application([
(r'/ws', WSHandler), #tells it to redirect ws:// to websocket handler
#Choose different names from defaults because of clarity
])
if __name__ == '__main__':
app.listen(5000) #listen on what port
ioloop.IOLoop.instance().start()
然后你必须有WSHandler
类,你指的是websockets trafic到
class WSHandler(websocket.WebSocketHandler):
#crossdomain connections allowed
def check_origin(self, origin):
return True
#when websocket connection is opened
def open(self):
print("Client connected ")
def on_close(self):
print("Client disconnected")
def on_message(self,message):
self.write_message(message) #echo back whatever client sent you
如此完整的应用程序看起来像
from tornado import websocket, web, ioloop
clients = []
#whenever you want to broadcast to all connected call this function
def broadcast_message(msg):
global clients
for client in clients:
client.write_message(msg)
class WSHandler(websocket.WebSocketHandler):
#crossdomain connections allowed
def check_origin(self, origin):
return True
#when websocket connection is opened
def open(self):
#here you can add clients to your client list if you want
clients.append(self)
print("Client connected ")
def on_close(self):
clients.remove(self)
print("Client disconnected")
def on_message(self,message):
self.write_message(message) #echo back whatever client sent you
app = web.Application([
(r'/ws', WSHandler), #tells it to redirect ws:// to websocket handler
#Choose different names from defaults because of clarity
])
if __name__ == '__main__':
app.listen(5000) #listen on what port
ioloop.IOLoop.instance().start()
现在用js连接到它
function WebSocketTest()
{
var ws = new WebSocket("ws://localhost:5000/ws");
ws.onopen = function()
{
ws.send("initial connect")
}
ws.onmessage = function (evt)
{
console.log(evt.data)
};
ws.onclose = function()
{
console.log("closed ");
};
}
我没有测试过,但应该可以使用