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