1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
# MIT license
"""
Custom logging handlers
WebSocketLogHandler :
Send logging messages to the WebSocket as JSON-encoded string.
"""
import logging
import json
class WebSocketLogHandler(logging.Handler):
"""
Send logging messages to the WebSocket as JSON-encoded string.
Parameters
----------
websocket : `~tornado.websocket.WebSocketHandler`
An `~tornado.websocket.WebSocketHandler` instance, which has
the ``write_message()`` method that will be used to send the
logging messages.
msg_type : str, optional
Set the type of the sent back message, for easier processing
by the client.
NOTE
----
The message sent through the WebSocket is a JSON-encoded string
from a dictionary, e.g.,
``{"type": self.msg_type,
"action": "log",
"levelname": record.levelname,
"levelno": record.levelno,
"name": record.name,
"asctime": record.asctime,
"message": <formatted-message>}``
"""
def __init__(self, websocket, msg_type=None):
super().__init__()
self.websocket = websocket
self.msg_type = msg_type
def emit(self, record):
try:
message = self.format(record)
msg = json.dumps({
"type": self.msg_type,
"action": "log",
"levelname": record.levelname,
"levelno": record.levelno,
"name": record.name,
"asctime": record.asctime,
"message": message,
})
self.websocket.write_message(msg)
except Exception:
self.handleError(record)
|
