anonymousland-synapse/synapse/rest/media/v1/media_storage.py
DeepBlueV7.X 560f3b8609
Include method in thumbnail media name (#7124)
This fixes an issue where different methods (crop/scale) overwrite each other.

This first tries the new path. If that fails and we are looking for a
remote thumbnail, it tries the old path. If that still isn't found, it
continues as normal.

This should probably be removed in the future, after some of the newer
thumbnails were generated with the new path on most deployments. Then
the overhead should be minimal if the other thumbnails need to be
regenerated.

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>
2020-09-08 17:19:50 +01:00

290 lines
10 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2018 New Vecotr 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.
import contextlib
import logging
import os
import shutil
from typing import IO, TYPE_CHECKING, Any, Optional, Sequence
from twisted.protocols.basic import FileSender
from synapse.logging.context import defer_to_thread, make_deferred_yieldable
from synapse.util.file_consumer import BackgroundFileConsumer
from ._base import FileInfo, Responder
from .filepath import MediaFilePaths
if TYPE_CHECKING:
from synapse.server import HomeServer
from .storage_provider import StorageProviderWrapper
logger = logging.getLogger(__name__)
class MediaStorage:
"""Responsible for storing/fetching files from local sources.
Args:
hs
local_media_directory: Base path where we store media on disk
filepaths
storage_providers: List of StorageProvider that are used to fetch and store files.
"""
def __init__(
self,
hs: "HomeServer",
local_media_directory: str,
filepaths: MediaFilePaths,
storage_providers: Sequence["StorageProviderWrapper"],
):
self.hs = hs
self.local_media_directory = local_media_directory
self.filepaths = filepaths
self.storage_providers = storage_providers
async def store_file(self, source: IO, file_info: FileInfo) -> str:
"""Write `source` to the on disk media store, and also any other
configured storage providers
Args:
source: A file like object that should be written
file_info: Info about the file to store
Returns:
the file path written to in the primary media store
"""
with self.store_into_file(file_info) as (f, fname, finish_cb):
# Write to the main repository
await defer_to_thread(
self.hs.get_reactor(), _write_file_synchronously, source, f
)
await finish_cb()
return fname
@contextlib.contextmanager
def store_into_file(self, file_info: FileInfo):
"""Context manager used to get a file like object to write into, as
described by file_info.
Actually yields a 3-tuple (file, fname, finish_cb), where file is a file
like object that can be written to, fname is the absolute path of file
on disk, and finish_cb is a function that returns an awaitable.
fname can be used to read the contents from after upload, e.g. to
generate thumbnails.
finish_cb must be called and waited on after the file has been
successfully been written to. Should not be called if there was an
error.
Args:
file_info: Info about the file to store
Example:
with media_storage.store_into_file(info) as (f, fname, finish_cb):
# .. write into f ...
await finish_cb()
"""
path = self._file_info_to_path(file_info)
fname = os.path.join(self.local_media_directory, path)
dirname = os.path.dirname(fname)
if not os.path.exists(dirname):
os.makedirs(dirname)
finished_called = [False]
async def finish():
for provider in self.storage_providers:
await provider.store_file(path, file_info)
finished_called[0] = True
try:
with open(fname, "wb") as f:
yield f, fname, finish
except Exception:
try:
os.remove(fname)
except Exception:
pass
raise
if not finished_called:
raise Exception("Finished callback not called")
async def fetch_media(self, file_info: FileInfo) -> Optional[Responder]:
"""Attempts to fetch media described by file_info from the local cache
and configured storage providers.
Args:
file_info
Returns:
Returns a Responder if the file was found, otherwise None.
"""
path = self._file_info_to_path(file_info)
local_path = os.path.join(self.local_media_directory, path)
if os.path.exists(local_path):
return FileResponder(open(local_path, "rb"))
# Fallback for paths without method names
# Should be removed in the future
if file_info.thumbnail and file_info.server_name:
legacy_path = self.filepaths.remote_media_thumbnail_rel_legacy(
server_name=file_info.server_name,
file_id=file_info.file_id,
width=file_info.thumbnail_width,
height=file_info.thumbnail_height,
content_type=file_info.thumbnail_type,
)
legacy_local_path = os.path.join(self.local_media_directory, legacy_path)
if os.path.exists(legacy_local_path):
return FileResponder(open(legacy_local_path, "rb"))
for provider in self.storage_providers:
res = await provider.fetch(path, file_info) # type: Any
if res:
logger.debug("Streaming %s from %s", path, provider)
return res
return None
async def ensure_media_is_in_local_cache(self, file_info: FileInfo) -> str:
"""Ensures that the given file is in the local cache. Attempts to
download it from storage providers if it isn't.
Args:
file_info
Returns:
Full path to local file
"""
path = self._file_info_to_path(file_info)
local_path = os.path.join(self.local_media_directory, path)
if os.path.exists(local_path):
return local_path
# Fallback for paths without method names
# Should be removed in the future
if file_info.thumbnail and file_info.server_name:
legacy_path = self.filepaths.remote_media_thumbnail_rel_legacy(
server_name=file_info.server_name,
file_id=file_info.file_id,
width=file_info.thumbnail_width,
height=file_info.thumbnail_height,
content_type=file_info.thumbnail_type,
)
legacy_local_path = os.path.join(self.local_media_directory, legacy_path)
if os.path.exists(legacy_local_path):
return legacy_local_path
dirname = os.path.dirname(local_path)
if not os.path.exists(dirname):
os.makedirs(dirname)
for provider in self.storage_providers:
res = await provider.fetch(path, file_info) # type: Any
if res:
with res:
consumer = BackgroundFileConsumer(
open(local_path, "wb"), self.hs.get_reactor()
)
await res.write_to_consumer(consumer)
await consumer.wait()
return local_path
raise Exception("file could not be found")
def _file_info_to_path(self, file_info: FileInfo) -> str:
"""Converts file_info into a relative path.
The path is suitable for storing files under a directory, e.g. used to
store files on local FS under the base media repository directory.
"""
if file_info.url_cache:
if file_info.thumbnail:
return self.filepaths.url_cache_thumbnail_rel(
media_id=file_info.file_id,
width=file_info.thumbnail_width,
height=file_info.thumbnail_height,
content_type=file_info.thumbnail_type,
method=file_info.thumbnail_method,
)
return self.filepaths.url_cache_filepath_rel(file_info.file_id)
if file_info.server_name:
if file_info.thumbnail:
return self.filepaths.remote_media_thumbnail_rel(
server_name=file_info.server_name,
file_id=file_info.file_id,
width=file_info.thumbnail_width,
height=file_info.thumbnail_height,
content_type=file_info.thumbnail_type,
method=file_info.thumbnail_method,
)
return self.filepaths.remote_media_filepath_rel(
file_info.server_name, file_info.file_id
)
if file_info.thumbnail:
return self.filepaths.local_media_thumbnail_rel(
media_id=file_info.file_id,
width=file_info.thumbnail_width,
height=file_info.thumbnail_height,
content_type=file_info.thumbnail_type,
method=file_info.thumbnail_method,
)
return self.filepaths.local_media_filepath_rel(file_info.file_id)
def _write_file_synchronously(source, dest):
"""Write `source` to the file like `dest` synchronously. Should be called
from a thread.
Args:
source: A file like object that's to be written
dest: A file like object to be written to
"""
source.seek(0) # Ensure we read from the start of the file
shutil.copyfileobj(source, dest)
class FileResponder(Responder):
"""Wraps an open file that can be sent to a request.
Args:
open_file (file): A file like object to be streamed ot the client,
is closed when finished streaming.
"""
def __init__(self, open_file):
self.open_file = open_file
def write_to_consumer(self, consumer):
return make_deferred_yieldable(
FileSender().beginFileTransfer(self.open_file, consumer)
)
def __exit__(self, exc_type, exc_val, exc_tb):
self.open_file.close()