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1 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 # Use of this source code is governed by a BSD-style license that can be | |
3 # found in the LICENSE file. | |
4 """Out of band HTTP push.""" | |
5 | |
6 import Queue | |
7 import json | |
8 import logging | |
9 import os | |
10 import threading | |
11 import time | |
12 import traceback | |
13 import urllib | |
14 | |
15 import errors | |
16 from verification import base | |
17 | |
18 | |
19 class AsyncPushNoop(object): | |
20 url = 'http://localhost' | |
21 def close(self): | |
22 pass | |
23 | |
24 def send(self, pending, packet): | |
25 pass | |
26 | |
27 @staticmethod | |
28 def _package(pending, packet): | |
29 data = { | |
30 'done': pending.get_state() not in (base.PROCESSING, base.IGNORED), | |
31 'issue': pending.issue, | |
32 'owner': pending.owner, | |
33 'patchset': pending.patchset, | |
34 'timestamp': time.time(), | |
35 } | |
36 if packet: | |
37 data.update(packet) | |
38 return data | |
39 | |
40 | |
41 class AsyncPushStore(AsyncPushNoop): | |
42 """Saves all the events into workdir/events.json for later analysis. | |
43 | |
44 Thread-safe. | |
45 """ | |
46 def __init__(self): | |
47 super(AsyncPushStore, self).__init__() | |
48 self.lock = threading.Lock() | |
49 self.queue = [] | |
50 | |
51 def close(self): | |
52 with self.lock: | |
53 with open(os.path.join('workdir', 'events.json'), 'w') as f: | |
54 json.dump(self.queue, f, indent=2) | |
55 | |
56 def send(self, pending, packet): | |
57 with self.lock: | |
58 self.queue.append(self._package(pending, packet)) | |
59 | |
60 | |
61 class AsyncPush(AsyncPushNoop): | |
62 """Sends HTTP Post asynchronously to the tree status application. | |
63 | |
64 This object uses a background worker thread, and is thread-safe. | |
65 """ | |
66 _TERMINATE = object() | |
67 | |
68 def __init__(self, url, password, resource='/receiver'): | |
69 super(AsyncPush, self).__init__() | |
70 assert url | |
71 assert password | |
72 self.url = url | |
73 self.resource = resource | |
74 self.password = password | |
75 self.queue = Queue.Queue() | |
76 self.thread = threading.Thread(target=self._worker_thread) | |
77 self.thread.daemon = True | |
78 self.thread.start() | |
79 | |
80 def close(self): | |
81 self.queue.put(self._TERMINATE) | |
82 self.thread.join() | |
83 | |
84 def send(self, pending, packet): | |
85 """Queues a packet.""" | |
86 logging.debug('For issue %d, queuing for send: %s', pending.issue, packet) | |
87 self.queue.put(self._package(pending, packet)) | |
88 | |
89 def _get_items(self): | |
90 """Waits for an item to be queued and returns up to 10 next items if queued | |
91 fast enough. | |
92 """ | |
93 items = [self.queue.get()] | |
94 try: | |
95 for _ in range(9): | |
96 items.append(self.queue.get_nowait()) | |
97 except Queue.Empty: | |
98 pass | |
99 return items | |
100 | |
101 def _worker_thread(self): | |
102 """Sends the packets in a loop through HTTP POST.""" | |
103 params = { | |
104 'Content-type': 'application/x-www-form-urlencoded', | |
105 'Accept': 'text/plain' | |
106 } | |
107 done = False | |
108 try: | |
109 while not done: | |
110 items = self._get_items() | |
111 if self._TERMINATE in items: | |
112 done = True | |
113 logging.debug('Worker thread exiting') | |
114 items.remove(self._TERMINATE) | |
115 url = self.url + self.resource | |
116 logging.debug('Sending %d items to %s: %r', len(items), url, items) | |
117 try: | |
118 data = [('p', json.dumps(item)) for item in items] | |
119 data.append(('password', self.password)) | |
120 urllib.urlopen(url, urllib.urlencode(data), params).read() | |
121 except IOError as e: | |
122 logging.error(e) | |
123 for item in items: | |
124 self.queue.put(item) | |
125 if not done: | |
126 time.sleep(1) | |
127 # Don't retry if done. | |
128 except Exception as e: | |
129 traceback.print_exc() | |
130 errors.send_stack(e) | |
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