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1#
2# Copyright (C) 2015 The Android Open Source Project
3#
4# Licensed under the Apache License, Version 2.0 (the 'License');
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an 'AS IS' BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15#
16import httplib
17import httplib2
18import logging
19import re
20import socket
21
22import apiclient.errors
23
24import gerrit
25import gmail
26import presubmit
27
28
29def get_gerrit_info(body):
30    info = {}
31    gerrit_pattern = r'^Gerrit-(\S+): (.+)$'
32    for match in re.finditer(gerrit_pattern, body, flags=re.MULTILINE):
33        info[match.group(1)] = match.group(2).strip()
34    return info
35
36
37def process_message(msg, dry_run):
38    try:
39        body = gmail.get_body(msg)
40        gerrit_info = get_gerrit_info(body)
41        if not gerrit_info:
42            logging.fatal('No Gerrit info found: %s', msg.subject)
43        msg_type = gerrit_info['MessageType']
44        handlers = {
45            'comment': presubmit.handle_comment,
46            'newchange': presubmit.handle_change,
47            'newpatchset': presubmit.handle_change,
48
49            'abandon': presubmit.skip_handler,
50            'merge-failed': presubmit.skip_handler,
51            'merged': presubmit.skip_handler,
52            'restore': presubmit.skip_handler,
53            'revert': presubmit.skip_handler,
54        }
55
56        message_type = gerrit_info['MessageType']
57        if message_type in handlers:
58            return handlers[message_type](gerrit_info, body, dry_run)
59        else:
60            logging.warning('MessageType %s unhandled.', msg_type)
61        return False
62    except NotImplementedError as ex:
63        logging.error("%s", ex)
64        return False
65    except gerrit.GerritError as ex:
66        change_id = gerrit_info['Change-Id']
67        logging.error('Gerrit error (%d): %s %s', ex.code, change_id, ex.url)
68        return ex.code == 404
69
70
71def get_and_process_jobs():
72    dry_run = False
73
74    gmail_service = gmail.build_service()
75    msg_service = gmail_service.users().messages()
76
77    # We run in a loop because some of the exceptions thrown here mean we just
78    # need to retry. For errors where we should back off (typically any gmail
79    # API exceptions), process_changes catches the error and returns normally.
80    while True:
81        try:
82            process_changes(gmail_service, msg_service, dry_run)
83            return
84        except httplib.BadStatusLine:
85            pass
86        except httplib2.ServerNotFoundError:
87            pass
88        except socket.error:
89            pass
90
91
92def process_changes(gmail_service, msg_service, dry_run):
93    try:
94        labels = gmail_service.users().labels().list(userId='me').execute()
95        if not labels['labels']:
96            logging.error('Could not retrieve Gmail labels')
97            return
98        label_id = gmail.get_gerrit_label(labels['labels'])
99        if not label_id:
100            logging.error('Could not find gerrit label')
101            return
102
103        for msg in gmail.get_all_messages(gmail_service, label_id):
104            msg = msg_service.get(userId='me', id=msg['id']).execute()
105            if process_message(msg, dry_run) and not dry_run:
106                msg_service.trash(userId='me', id=msg['id']).execute()
107    except apiclient.errors.HttpError as ex:
108        logging.error('API Client HTTP error: %s', ex)
109