author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 14 Jul 2009 21:09:18 +0200 | |
changeset 2651 | 842c0f11fc1e |
parent 2413 | d0b7dac5325c |
child 2864 | 2e0b0af889be |
permissions | -rwxr-xr-x |
2413
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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"""Stub version of the Task Queue API. |
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This stub only stores tasks; it doesn't actually run them. It also validates |
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the tasks by checking their queue name against the queue.yaml. |
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As well as implementing Task Queue API functions, the stub exposes various other |
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functions that are used by the dev_appserver's admin console to display the |
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application's queues and tasks. |
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""" |
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import base64 |
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import datetime |
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import os |
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import taskqueue_service_pb |
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from google.appengine.api import apiproxy_stub |
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from google.appengine.api import queueinfo |
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from google.appengine.api import urlfetch |
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from google.appengine.runtime import apiproxy_errors |
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DEFAULT_RATE = '5.00/s' |
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DEFAULT_BUCKET_SIZE = 5 |
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def _ParseQueueYaml(unused_self, root_path): |
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"""Load the queue.yaml file and parse it.""" |
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if root_path is None: |
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return None |
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for queueyaml in ('queue.yaml', 'queue.yml'): |
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try: |
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fh = open(os.path.join(root_path, queueyaml), 'r') |
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except IOError: |
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continue |
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try: |
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queue_info = queueinfo.LoadSingleQueue(fh) |
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return queue_info |
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finally: |
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fh.close() |
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return None |
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def _CompareEta(a, b): |
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"""Python sort comparator for task ETAs.""" |
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if a.eta_usec() > b.eta_usec(): |
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return 1 |
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if a.eta_usec() < b.eta_usec(): |
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return -1 |
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return 0 |
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def _FormatEta(eta_usec): |
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"""Formats a task ETA as a date string in UTC.""" |
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eta = datetime.datetime.fromtimestamp(eta_usec/1000000) |
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return eta.strftime('%Y/%m/%d %H:%M:%S') |
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def _EtaDelta(eta_usec): |
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"""Formats a task ETA as a relative time string.""" |
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eta = datetime.datetime.fromtimestamp(eta_usec/1000000) |
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now = datetime.datetime.utcnow() |
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if eta > now: |
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return str(eta - now) + ' from now' |
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else: |
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return str(now - eta) + ' ago' |
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89 |
class TaskQueueServiceStub(apiproxy_stub.APIProxyStub): |
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"""Python only task queue service stub. |
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92 |
This stub does not attempt to automatically execute tasks. Instead, it |
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stores them for display on a console. The user may manually execute the |
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tasks from the console. |
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95 |
""" |
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queue_yaml_parser = _ParseQueueYaml |
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def __init__(self, service_name='taskqueue', root_path=None): |
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"""Constructor. |
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102 |
Args: |
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103 |
service_name: Service name expected for all calls. |
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104 |
root_path: Root path to the directory of the application which may contain |
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105 |
a queue.yaml file. If None, then it's assumed no queue.yaml file is |
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106 |
available. |
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changeset
|
107 |
""" |
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|
108 |
super(TaskQueueServiceStub, self).__init__(service_name) |
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parents:
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|
109 |
self.taskqueues = {} |
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parents:
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|
110 |
self.next_task_id = 1 |
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parents:
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|
111 |
self.root_path = root_path |
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parents:
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changeset
|
112 |
|
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parents:
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|
113 |
def _Dynamic_Add(self, request, unused_response): |
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|
114 |
if not self._ValidQueue(request.queue_name()): |
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|
115 |
raise apiproxy_errors.ApplicationError( |
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|
116 |
taskqueue_service_pb.TaskQueueServiceError.UNKNOWN_QUEUE) |
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|
117 |
return |
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|
118 |
|
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|
119 |
if not request.task_name(): |
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|
120 |
request.set_task_name('task%d' % self.next_task_id) |
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parents:
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|
121 |
self.next_task_id += 1 |
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parents:
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|
122 |
|
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|
123 |
tasks = self.taskqueues.setdefault(request.queue_name(), []) |
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parents:
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|
124 |
tasks.append(request) |
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|
125 |
tasks.sort(_CompareEta) |
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|
126 |
return |
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|
127 |
|
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|
128 |
def _ValidQueue(self, queue_name): |
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|
129 |
if queue_name == 'default': |
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|
130 |
return True |
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|
131 |
queue_info = self.queue_yaml_parser(self.root_path) |
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|
132 |
if queue_info and queue_info.queue: |
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parents:
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|
133 |
for entry in queue_info.queue: |
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parents:
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|
134 |
if entry.name == queue_name: |
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parents:
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|
135 |
return True |
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|
136 |
return False |
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|
137 |
|
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parents:
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|
138 |
def GetQueues(self): |
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parents:
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139 |
"""Gets all the applications's queues. |
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parents:
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|
140 |
|
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parents:
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|
141 |
Returns: |
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parents:
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|
142 |
A list of dictionaries, where each dictionary contains one queue's |
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parents:
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|
143 |
attributes. |
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parents:
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|
144 |
""" |
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parents:
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|
145 |
queues = [] |
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|
146 |
queue_info = self.queue_yaml_parser(self.root_path) |
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parents:
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|
147 |
has_default = False |
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parents:
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|
148 |
if queue_info and queue_info.queue: |
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parents:
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|
149 |
for entry in queue_info.queue: |
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parents:
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|
150 |
if entry.name == 'default': |
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parents:
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|
151 |
has_default = True |
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parents:
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|
152 |
queue = {} |
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parents:
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|
153 |
queues.append(queue) |
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parents:
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|
154 |
queue['name'] = entry.name |
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parents:
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|
155 |
queue['max_rate'] = entry.rate |
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parents:
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|
156 |
if entry.bucket_size: |
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parents:
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|
157 |
queue['bucket_size'] = entry.bucket_size |
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parents:
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changeset
|
158 |
else: |
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parents:
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|
159 |
queue['bucket_size'] = DEFAULT_BUCKET_SIZE |
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parents:
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|
160 |
|
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parents:
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|
161 |
tasks = self.taskqueues.setdefault(entry.name, []) |
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parents:
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|
162 |
if tasks: |
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parents:
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|
163 |
queue['oldest_task'] = _FormatEta(tasks[0].eta_usec()) |
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parents:
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|
164 |
queue['eta_delta'] = _EtaDelta(tasks[0].eta_usec()) |
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parents:
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changeset
|
165 |
else: |
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parents:
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|
166 |
queue['oldest_task'] = '' |
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parents:
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|
167 |
queue['tasks_in_queue'] = len(tasks) |
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parents:
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changeset
|
168 |
|
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parents:
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|
169 |
if not has_default: |
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parents:
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changeset
|
170 |
queue = {} |
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parents:
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|
171 |
queues.append(queue) |
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parents:
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changeset
|
172 |
queue['name'] = 'default' |
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parents:
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changeset
|
173 |
queue['max_rate'] = DEFAULT_RATE |
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parents:
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changeset
|
174 |
queue['bucket_size'] = DEFAULT_BUCKET_SIZE |
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parents:
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changeset
|
175 |
|
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parents:
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changeset
|
176 |
tasks = self.taskqueues.get('default', []) |
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parents:
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changeset
|
177 |
if tasks: |
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parents:
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changeset
|
178 |
queue['oldest_task'] = _FormatEta(tasks[0].eta_usec()) |
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parents:
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changeset
|
179 |
queue['eta_delta'] = _EtaDelta(tasks[0].eta_usec()) |
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parents:
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changeset
|
180 |
else: |
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parents:
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changeset
|
181 |
queue['oldest_task'] = '' |
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parents:
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changeset
|
182 |
queue['tasks_in_queue'] = len(tasks) |
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parents:
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changeset
|
183 |
return queues |
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parents:
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changeset
|
184 |
|
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parents:
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changeset
|
185 |
def GetTasks(self, queue_name): |
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parents:
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|
186 |
"""Gets a queue's tasks. |
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parents:
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changeset
|
187 |
|
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parents:
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changeset
|
188 |
Args: |
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parents:
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changeset
|
189 |
queue_name: Queue's name to return tasks for. |
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parents:
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changeset
|
190 |
|
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parents:
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changeset
|
191 |
Returns: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
192 |
A list of dictionaries, where each dictionary contains one task's |
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parents:
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changeset
|
193 |
attributes. |
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parents:
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changeset
|
194 |
""" |
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parents:
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|
195 |
tasks = self.taskqueues.get(queue_name, []) |
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parents:
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changeset
|
196 |
result_tasks = [] |
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parents:
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changeset
|
197 |
for task_request in tasks: |
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parents:
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changeset
|
198 |
task = {} |
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parents:
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|
199 |
result_tasks.append(task) |
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parents:
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changeset
|
200 |
task['name'] = task_request.task_name() |
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parents:
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|
201 |
task['url'] = task_request.url() |
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parents:
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changeset
|
202 |
method = task_request.method() |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
203 |
if (method == taskqueue_service_pb.TaskQueueAddRequest.GET): |
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parents:
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changeset
|
204 |
task['method'] = 'GET' |
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parents:
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changeset
|
205 |
elif (method == taskqueue_service_pb.TaskQueueAddRequest.POST): |
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parents:
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changeset
|
206 |
task['method'] = 'POST' |
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parents:
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changeset
|
207 |
elif (method == taskqueue_service_pb.TaskQueueAddRequest.HEAD): |
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parents:
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changeset
|
208 |
task['method'] = 'HEAD' |
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parents:
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changeset
|
209 |
elif (method == taskqueue_service_pb.TaskQueueAddRequest.PUT): |
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parents:
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|
210 |
task['method'] = 'PUT' |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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changeset
|
211 |
elif (method == taskqueue_service_pb.TaskQueueAddRequest.DELETE): |
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parents:
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changeset
|
212 |
task['method'] = 'DELETE' |
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213 |
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task['eta'] = _FormatEta(task_request.eta_usec()) |
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215 |
task['eta_delta'] = _EtaDelta(task_request.eta_usec()) |
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216 |
task['body'] = base64.b64encode(task_request.body()) |
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217 |
headers = urlfetch._CaselessDict() |
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task['headers'] = headers |
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219 |
for req_header in task_request.header_list(): |
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headers[req_header.key()] = req_header.value() |
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221 |
|
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222 |
headers['X-AppEngine-QueueName'] = queue_name |
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headers['X-AppEngine-TaskName'] = task['name'] |
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headers['X-AppEngine-TaskRetryCount'] = '0' |
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headers['X-AppEngine-Development-Payload'] = '1' |
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headers['Content-Length'] = len(task['body']) |
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headers['Content-Type'] = headers.get( |
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'Content-Type', 'application/octet-stream') |
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229 |
|
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230 |
return result_tasks |
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231 |
|
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232 |
def DeleteTask(self, queue_name, task_name): |
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233 |
"""Deletes a task from a queue. |
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234 |
|
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235 |
Args: |
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236 |
queue_name: the name of the queue to delete the task from. |
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237 |
task_name: the name of the task to delete. |
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238 |
""" |
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239 |
tasks = self.taskqueues.get(queue_name, []) |
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240 |
for task in tasks: |
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241 |
if task.task_name() == task_name: |
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242 |
tasks.remove(task) |
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243 |
return |
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244 |
|
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245 |
def FlushQueue(self, queue_name): |
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"""Removes all tasks from a queue. |
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247 |
|
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248 |
Args: |
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249 |
queue_name: the name of the queue to remove tasks from. |
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250 |
""" |
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251 |
self.taskqueues[queue_name] = [] |