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#!/usr/bin/env python
# Copyright 2010 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Handle special HTTP requests.
/web-page-replay-generate-[RESPONSE_CODE]
- Return the given RESPONSE_CODE.
/web-page-replay-post-image-[FILENAME]
- Save the posted image to local disk.
/web-page-replay-command-[record|replay|status]
- Optional. Enable by calling custom_handlers.add_server_manager_handler(...).
- Change the server mode to either record or replay.
+ When switching to record, the http_archive is cleared.
+ When switching to replay, the http_archive is maintained.
"""
import base64
import httparchive
import httplib
import json
import logging
import os
COMMON_URL_PREFIX = '/web-page-replay-'
COMMAND_URL_PREFIX = COMMON_URL_PREFIX + 'command-'
GENERATOR_URL_PREFIX = COMMON_URL_PREFIX + 'generate-'
POST_IMAGE_URL_PREFIX = COMMON_URL_PREFIX + 'post-image-'
IMAGE_DATA_PREFIX = 'data:image/png;base64,'
def SimpleResponse(status):
"""Return a ArchivedHttpResponse with |status| code and a simple text body."""
return httparchive.create_response(status)
def JsonResponse(data):
"""Return a ArchivedHttpResponse with |data| encoded as json in the body."""
status = 200
reason = 'OK'
headers = [('content-type', 'application/json')]
body = json.dumps(data)
return httparchive.create_response(status, reason, headers, body)
class CustomHandlers(object):
def __init__(self, screenshot_dir=None):
"""Initialize CustomHandlers.
Args:
screenshot_dir: a path to which screenshots are saved.
"""
self.handlers = [
(GENERATOR_URL_PREFIX, self.get_generator_url_response_code)]
if screenshot_dir:
if not os.path.exists(screenshot_dir):
try:
os.makedirs(screenshot_dir)
except IOError:
logging.error('Unable to create screenshot dir: %s', screenshot_dir)
screenshot_dir = None
if screenshot_dir:
self.screenshot_dir = screenshot_dir
self.handlers.append(
(POST_IMAGE_URL_PREFIX, self.handle_possible_post_image))
def handle(self, request):
"""Dispatches requests to matching handlers.
Args:
request: an http request
Returns:
ArchivedHttpResponse or None.
"""
for prefix, handler in self.handlers:
if request.path.startswith(prefix):
return handler(request, request.path[len(prefix):])
return None
def get_generator_url_response_code(self, request, url_suffix):
"""Parse special generator URLs for the embedded response code.
Clients like perftracker can use URLs of this form to request
a response with a particular response code.
Args:
request: an ArchivedHttpRequest instance
url_suffix: string that is after the handler prefix (e.g. 304)
Returns:
On a match, an ArchivedHttpResponse.
Otherwise, None.
"""
try:
response_code = int(url_suffix)
return SimpleResponse(response_code)
except ValueError:
return None
def handle_possible_post_image(self, request, url_suffix):
"""If sent, saves embedded image to local directory.
Expects a special url containing the filename. If sent, saves the base64
encoded request body as a PNG image locally. This feature is enabled by
passing in screenshot_dir to the initializer for this class.
Args:
request: an ArchivedHttpRequest instance
url_suffix: string that is after the handler prefix (e.g. 'foo.png')
Returns:
On a match, an ArchivedHttpResponse.
Otherwise, None.
"""
basename = url_suffix
if not basename:
return None
data = request.request_body
if not data.startswith(IMAGE_DATA_PREFIX):
logging.error('Unexpected image format for: %s', basename)
return SimpleResponse(400)
data = data[len(IMAGE_DATA_PREFIX):]
png = base64.b64decode(data)
filename = os.path.join(self.screenshot_dir,
'%s-%s.png' % (request.host, basename))
if not os.access(self.screenshot_dir, os.W_OK):
logging.error('Unable to write to: %s', filename)
return SimpleResponse(400)
with file(filename, 'w') as f:
f.write(png)
return SimpleResponse(200)
def add_server_manager_handler(self, server_manager):
"""Add the ability to change the server mode (e.g. to record mode).
Args:
server_manager: a servermanager.ServerManager instance.
"""
self.server_manager = server_manager
self.handlers.append(
(COMMAND_URL_PREFIX, self.handle_server_manager_command))
def handle_server_manager_command(self, request, url_suffix):
"""Parse special URLs for the embedded server manager command.
Clients like webpagetest.org can use URLs of this form to change
the replay server from record mode to replay mode.
This handler is not in the default list of handlers. Call
add_server_manager_handler to add it.
In the future, this could be expanded to save or serve archive files.
Args:
request: an ArchivedHttpRequest instance
url_suffix: string that is after the handler prefix (e.g. 'record')
Returns:
On a match, an ArchivedHttpResponse.
Otherwise, None.
"""
command = url_suffix
if command == 'record':
self.server_manager.SetRecordMode()
return SimpleResponse(200)
elif command == 'replay':
self.server_manager.SetReplayMode()
return SimpleResponse(200)
elif command == 'status':
is_record_mode = self.server_manager.IsRecordMode()
return JsonResponse({'is_record_mode': is_record_mode})
return None
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