diff options
Diffstat (limited to 'synapse/rest/media')
| -rw-r--r-- | synapse/rest/media/v1/media_storage.py | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/synapse/rest/media/v1/media_storage.py b/synapse/rest/media/v1/media_storage.py new file mode 100644 index 0000000000..052745e6f6 --- /dev/null +++ b/synapse/rest/media/v1/media_storage.py @@ -0,0 +1,198 @@ +# -*- 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. + +from twisted.internet import defer, threads +from twisted.protocols.basic import FileSender + +from ._base import Responder + +from synapse.util.logcontext import make_deferred_yieldable + +import contextlib +import os +import logging +import shutil + +logger = logging.getLogger(__name__) + + +class MediaStorage(object): + """Responsible for storing/fetching files from local sources. + """ + + def __init__(self, local_media_directory, filepaths): + self.local_media_directory = local_media_directory + self.filepaths = filepaths + + @defer.inlineCallbacks + def store_file(self, source, file_info): + """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 (FileInfo): Info about the file to store + + Returns: + Deferred[str]: the file path written to in the primary media store + """ + 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) + + # Write to the main repository + yield make_deferred_yieldable(threads.deferToThread( + _write_file_synchronously, source, fname, + )) + + defer.returnValue(fname) + + @contextlib.contextmanager + def store_into_file(self, file_info): + """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 finish_cb is a + function that returns a Deferred that must be waited on after the file + has been successfully written to. + + Args: + file_info (FileInfo): Info about the file to store + + Example: + + with media_storage.store_into_file(info) as (f, fname, finish_cb): + # .. write into f ... + yield 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] + + def finish(): + # This will be used later when we want to hit out to other storage + # places + finished_called[0] = True + return defer.succeed(None) + + try: + with open(fname, "wb") as f: + yield f, fname, finish + except Exception as e: + try: + os.remove(fname) + except Exception: + pass + raise e + + if not finished_called: + raise Exception("Fnished callback not called") + + @defer.inlineCallbacks + def fetch_media(self, file_info): + """Attempts to fetch media described by file_info from the local cache + and configured storage providers. + + Args: + file_info (FileInfo) + + Returns: + Deferred(Responder): 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): + defer.returnValue(FileResponder(open(local_path, "rb"))) + + defer.returnValue(None) + + def _file_info_to_path(self, file_info): + """Converts file_info into a relative path. + """ + if file_info.url_cache: + 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, fname): + """Write `source` to the path `fname` synchronously. Should be called + from a thread. + + Args: + source: A file like object to be written + fname (str): Path to write to + """ + dirname = os.path.dirname(fname) + if not os.path.exists(dirname): + os.makedirs(dirname) + + source.seek(0) # Ensure we read from the start of the file + with open(fname, "wb") as f: + shutil.copyfileobj(source, f) + + +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 + + @defer.inlineCallbacks + def write_to_consumer(self, consumer): + with self.open_file: + yield FileSender().beginFileTransfer(self.open_file, consumer) + + def cancel(self): + self.open_file.close() |