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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import json
import logging
import os
import appengine_blobstore as blobstore
from appengine_wrappers import urlfetch
from file_system import FileSystem, StatInfo
from future import Future
from object_store_creator import ObjectStoreCreator
from StringIO import StringIO
from zipfile import ZipFile, BadZipfile
ZIP_KEY = 'zipball'
USERNAME = None
PASSWORD = None
def _MakeBlobstoreKey(version):
return ZIP_KEY + '.' + str(version)
class _AsyncFetchFutureZip(object):
def __init__(self, fetcher, blobstore, key_to_set, key_to_delete=None):
self._fetcher = fetcher
self._fetch = fetcher.FetchAsync(ZIP_KEY,
username=USERNAME,
password=PASSWORD)
self._blobstore = blobstore
self._key_to_set = key_to_set
self._key_to_delete = key_to_delete
def Get(self):
try:
result = self._fetch.Get()
# Check if Github authentication failed.
if result.status_code == 401:
logging.error('Github authentication failed for %s, falling back to '
'unauthenticated.' % USERNAME)
blob = self._fetcher.Fetch(ZIP_KEY).content
else:
blob = result.content
except urlfetch.DownloadError as e:
logging.error('Bad github zip file: %s' % e)
return None
if self._key_to_delete is not None:
self._blobstore.Delete(_MakeBlobstoreKey(self._key_to_delete),
blobstore.BLOBSTORE_GITHUB)
try:
return_zip = ZipFile(StringIO(blob))
except BadZipfile as e:
logging.error('Bad github zip file: %s' % e)
return None
self._blobstore.Set(_MakeBlobstoreKey(self._key_to_set),
blob,
blobstore.BLOBSTORE_GITHUB)
return return_zip
class GithubFileSystem(FileSystem):
"""FileSystem implementation which fetches resources from github.
"""
def __init__(self, fetcher, blobstore):
self._fetcher = fetcher
self._stat_object_store = ObjectStoreCreator(GithubFileSystem).Create()
self._blobstore = blobstore
self._version = None
self._GetZip(self.Stat(ZIP_KEY).version)
def _GetZip(self, version):
blob = self._blobstore.Get(_MakeBlobstoreKey(version),
blobstore.BLOBSTORE_GITHUB)
if blob is not None:
try:
self._zip_file = Future(value=ZipFile(StringIO(blob)))
except BadZipfile as e:
self._blobstore.Delete(_MakeBlobstoreKey(version),
blobstore.BLOBSTORE_GITHUB)
logging.error('Bad github zip file: %s' % e)
self._zip_file = Future(value=None)
else:
self._zip_file = Future(
delegate=_AsyncFetchFutureZip(self._fetcher,
self._blobstore,
version,
key_to_delete=self._version))
self._version = version
def _ReadFile(self, path):
try:
zip_file = self._zip_file.Get()
except Exception as e:
logging.error('Github ReadFile error: %s' % e)
return ''
if zip_file is None:
logging.error('Bad github zip file.')
return ''
prefix = zip_file.namelist()[0][:-1]
return zip_file.read(prefix + path)
def _ListDir(self, path):
try:
zip_file = self._zip_file.Get()
except Exception as e:
logging.error('Github ListDir error: %s' % e)
return []
if zip_file is None:
logging.error('Bad github zip file.')
return []
filenames = zip_file.namelist()
# Take out parent directory name (GoogleChrome-chrome-app-samples-c78a30f)
filenames = [f[len(filenames[0]) - 1:] for f in filenames]
# Remove the path of the directory we're listing from the filenames.
filenames = [f[len(path):] for f in filenames
if f != path and f.startswith(path)]
# Remove all files not directly in this directory.
return [f for f in filenames if f[:-1].count('/') == 0]
def Read(self, paths, binary=False):
version = self.Stat(ZIP_KEY).version
if version != self._version:
self._GetZip(version)
result = {}
for path in paths:
if path.endswith('/'):
result[path] = self._ListDir(path)
else:
result[path] = self._ReadFile(path)
return Future(value=result)
def _DefaultStat(self, path):
version = 0
# TODO(kalman): we should replace all of this by wrapping the
# GithubFileSystem in a CachingFileSystem. A lot of work has been put into
# CFS to be robust, and GFS is missing out.
# For example: the following line is wrong, but it could be moot.
self._stat_object_store.Set(path, version)
return StatInfo(version)
def Stat(self, path):
version = self._stat_object_store.Get(path).Get()
if version is not None:
return StatInfo(version)
try:
result = self._fetcher.Fetch('commits/HEAD',
username=USERNAME,
password=PASSWORD)
except urlfetch.DownloadError as e:
logging.error('GithubFileSystem Stat: %s' % e)
return self._DefaultStat(path)
# Check if Github authentication failed.
if result.status_code == 401:
logging.error('Github authentication failed for %s, falling back to '
'unauthenticated.' % USERNAME)
try:
result = self._fetcher.Fetch('commits/HEAD')
except urlfetch.DownloadError as e:
logging.error('GithubFileSystem Stat: %s' % e)
return self._DefaultStat(path)
version = (json.loads(result.content).get('commit', {})
.get('tree', {})
.get('sha', None))
# Check if the JSON was valid, and set to 0 if not.
if version is not None:
self._stat_object_store.Set(path, version)
else:
logging.warning('Problem fetching commit hash from github.')
return self._DefaultStat(path)
return StatInfo(version)
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