Add StorageProvider concept

This commit is contained in:
Erik Johnston 2018-01-08 17:19:55 +00:00
parent 2442e9876c
commit 8f03aa9f61
3 changed files with 162 additions and 9 deletions

View File

@ -27,6 +27,9 @@ from .identicon_resource import IdenticonResource
from .preview_url_resource import PreviewUrlResource
from .filepath import MediaFilePaths
from .thumbnailer import Thumbnailer
from .storage_provider import (
StorageProviderWrapper, FileStorageProviderBackend,
)
from .media_storage import MediaStorage
from synapse.http.matrixfederationclient import MatrixFederationHttpClient
@ -66,10 +69,6 @@ class MediaRepository(object):
self.primary_base_path = hs.config.media_store_path
self.filepaths = MediaFilePaths(self.primary_base_path)
self.backup_base_path = hs.config.backup_media_store_path
self.synchronous_backup_media_store = hs.config.synchronous_backup_media_store
self.dynamic_thumbnails = hs.config.dynamic_thumbnails
self.thumbnail_requirements = hs.config.thumbnail_requirements
@ -77,7 +76,27 @@ class MediaRepository(object):
self.recently_accessed_remotes = set()
self.media_storage = MediaStorage(self.primary_base_path, self.filepaths)
# List of StorageProvider's where we should search for media and
# potentially upload to.
self.storage_providers = []
# TODO: Move this into config and allow other storage providers to be
# defined.
if hs.config.backup_media_store_path:
backend = FileStorageProviderBackend(
self.primary_base_path, hs.config.backup_media_store_path,
)
provider = StorageProviderWrapper(
backend,
store=True,
store_synchronous=hs.config.synchronous_backup_media_store,
store_remote=True,
)
self.storage_providers.append(provider)
self.media_storage = MediaStorage(
self.primary_base_path, self.filepaths, self.storage_providers,
)
self.clock.looping_call(
self._update_recently_accessed_remotes,

View File

@ -32,9 +32,10 @@ class MediaStorage(object):
"""Responsible for storing/fetching files from local sources.
"""
def __init__(self, local_media_directory, filepaths):
def __init__(self, local_media_directory, filepaths, storage_providers):
self.local_media_directory = local_media_directory
self.filepaths = filepaths
self.storage_providers = storage_providers
@defer.inlineCallbacks
def store_file(self, source, file_info):
@ -90,11 +91,12 @@ class MediaStorage(object):
finished_called = [False]
@defer.inlineCallbacks
def finish():
# This will be used later when we want to hit out to other storage
# places
for provider in self.storage_providers:
yield provider.store_file(path, file_info)
finished_called[0] = True
return defer.succeed(None)
try:
with open(fname, "wb") as f:
@ -127,6 +129,11 @@ class MediaStorage(object):
if os.path.exists(local_path):
defer.returnValue(FileResponder(open(local_path, "rb")))
for provider in self.storage_providers:
res = yield provider.fetch(path, file_info)
if res:
defer.returnValue(res)
defer.returnValue(None)
def _file_info_to_path(self, file_info):

View File

@ -0,0 +1,127 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# 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.
from twisted.internet import defer, threads
from .media_storage import FileResponder
from synapse.util.logcontext import preserve_fn
import logging
import os
import shutil
logger = logging.getLogger(__name__)
class StorageProvider(object):
"""A storage provider is a service that can store uploaded media and
retrieve them.
"""
def store_file(self, path, file_info):
"""Store the file described by file_info. The actual contents can be
retrieved by reading the file in file_info.upload_path.
Args:
path (str): Relative path of file in local cache
file_info (FileInfo)
Returns:
Deferred
"""
pass
def fetch(self, path, file_info):
"""Attempt to fetch the file described by file_info and stream it
into writer.
Args:
path (str): Relative path of file in local cache
file_info (FileInfo)
Returns:
Deferred(Responder): Returns a Responder if the provider has the file,
otherwise returns None.
"""
pass
class StorageProviderWrapper(StorageProvider):
"""Wraps a storage provider and provides various config options
Args:
backend (StorageProvider)
store (bool): Whether to store new files or not.
store_synchronous (bool): Whether to wait for file to be successfully
uploaded, or todo the upload in the backgroud.
store_remote (bool): Whether remote media should be uploaded
"""
def __init__(self, backend, store, store_synchronous, store_remote):
self.backend = backend
self.store = store
self.store_synchronous = store_synchronous
self.store_remote = store_remote
def store_file(self, path, file_info):
if not self.store:
return defer.succeed(None)
if file_info.server_name and not self.store_remote:
return defer.succeed(None)
if self.store_synchronous:
return self.backend.store_file(path, file_info)
else:
# TODO: Handle errors.
preserve_fn(self.backend.store_file)(path, file_info)
return defer.succeed(None)
def fetch(self, path, file_info):
return self.backend.fetch(path, file_info)
class FileStorageProviderBackend(StorageProvider):
"""A storage provider that stores files in a directory on a filesystem.
Args:
cache_directory (str): Base path of the local media repository
base_directory (str): Base path to store new files
"""
def __init__(self, cache_directory, base_directory):
self.cache_directory = cache_directory
self.base_directory = base_directory
def store_file(self, path, file_info):
"""See StorageProvider.store_file"""
primary_fname = os.path.join(self.cache_directory, path)
backup_fname = os.path.join(self.base_directory, path)
dirname = os.path.dirname(backup_fname)
if not os.path.exists(dirname):
os.makedirs(dirname)
return threads.deferToThread(
shutil.copyfile, primary_fname, backup_fname,
)
def fetch(self, path, file_info):
"""See StorageProvider.fetch"""
backup_fname = os.path.join(self.base_directory, path)
if os.path.isfile(backup_fname):
return FileResponder(open(backup_fname, "rb"))