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Regenerate exact thumbnails if missing (#9438)

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Erik Johnston 2021-02-19 17:09:57 +00:00 committed by GitHub
commit 179c0953ff
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6 changed files with 133 additions and 15 deletions
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1
changelog.d/9438.feature Normal file
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@ -0,0 +1 @@
Add support for regenerating thumbnails if they have been deleted but the original image is still stored.

2
synapse/rest/media/v1/media_repository.py
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@ -509,7 +509,7 @@ class MediaRepository:
t_height: int,
t_method: str,
t_type: str,
url_cache: str,
url_cache: Optional[str],
) -> Optional[str]:
input_path = await self.media_storage.ensure_media_is_in_local_cache(
FileInfo(None, media_id, url_cache=url_cache)

2
synapse/rest/media/v1/media_storage.py
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@ -244,7 +244,7 @@ class MediaStorage:
await consumer.wait()
return local_path
raise Exception("file could not be found")
raise NotFoundError()
def _file_info_to_path(self, file_info: FileInfo) -> str:
"""Converts file_info into a relative path.

56
synapse/rest/media/v1/thumbnail_resource.py
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@ -114,6 +114,7 @@ class ThumbnailResource(DirectServeJsonResource):
m_type,
thumbnail_infos,
media_id,
media_id,
url_cache=media_info["url_cache"],
server_name=None,
)
@ -269,6 +270,7 @@ class ThumbnailResource(DirectServeJsonResource):
method,
m_type,
thumbnail_infos,
media_id,
media_info["filesystem_id"],
url_cache=None,
server_name=server_name,
@ -282,6 +284,7 @@ class ThumbnailResource(DirectServeJsonResource):
desired_method: str,
desired_type: str,
thumbnail_infos: List[Dict[str, Any]],
media_id: str,
file_id: str,
url_cache: Optional[str] = None,
server_name: Optional[str] = None,
@ -317,8 +320,59 @@ class ThumbnailResource(DirectServeJsonResource):
return
responder = await self.media_storage.fetch_media(file_info)
if responder:
await respond_with_responder(
request, responder, file_info.thumbnail_type, file_info.thumbnail_length
request,
responder,
file_info.thumbnail_type,
file_info.thumbnail_length,
)
return
# If we can't find the thumbnail we regenerate it. This can happen
# if e.g. we've deleted the thumbnails but still have the original
# image somewhere.
#
# Since we have an entry for the thumbnail in the DB we a) know we
# have have successfully generated the thumbnail in the past (so we
# don't need to worry about repeatedly failing to generate
# thumbnails), and b) have already calculated that appropriate
# width/height/method so we can just call the "generate exact"
# methods.
# First let's check that we do actually have the original image
# still. This will throw a 404 if we don't.
# TODO: We should refetch the thumbnails for remote media.
await self.media_storage.ensure_media_is_in_local_cache(
FileInfo(server_name, file_id, url_cache=url_cache)
)
if server_name:
await self.media_repo.generate_remote_exact_thumbnail(
server_name,
file_id=file_id,
media_id=media_id,
t_width=file_info.thumbnail_width,
t_height=file_info.thumbnail_height,
t_method=file_info.thumbnail_method,
t_type=file_info.thumbnail_type,
)
else:
await self.media_repo.generate_local_exact_thumbnail(
media_id=media_id,
t_width=file_info.thumbnail_width,
t_height=file_info.thumbnail_height,
t_method=file_info.thumbnail_method,
t_type=file_info.thumbnail_type,
url_cache=url_cache,
)
responder = await self.media_storage.fetch_media(file_info)
await respond_with_responder(
request,
responder,
file_info.thumbnail_type,
file_info.thumbnail_length,
)
else:
logger.info("Failed to find any generated thumbnails")

18
synapse/storage/databases/main/media_repository.py
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@ -344,16 +344,16 @@ class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
thumbnail_method,
thumbnail_length,
):
await self.db_pool.simple_insert(
"local_media_repository_thumbnails",
{
await self.db_pool.simple_upsert(
table="local_media_repository_thumbnails",
keyvalues={
"media_id": media_id,
"thumbnail_width": thumbnail_width,
"thumbnail_height": thumbnail_height,
"thumbnail_method": thumbnail_method,
"thumbnail_type": thumbnail_type,
"thumbnail_length": thumbnail_length,
},
values={"thumbnail_length": thumbnail_length},
desc="store_local_thumbnail",
)
@ -498,18 +498,18 @@ class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
thumbnail_method,
thumbnail_length,
):
await self.db_pool.simple_insert(
"remote_media_cache_thumbnails",
{
await self.db_pool.simple_upsert(
table="remote_media_cache_thumbnails",
keyvalues={
"media_origin": origin,
"media_id": media_id,
"thumbnail_width": thumbnail_width,
"thumbnail_height": thumbnail_height,
"thumbnail_method": thumbnail_method,
"thumbnail_type": thumbnail_type,
"thumbnail_length": thumbnail_length,
"filesystem_id": filesystem_id,
},
values={"thumbnail_length": thumbnail_length},
insertion_values={"filesystem_id": filesystem_id},
desc="store_remote_media_thumbnail",
)

69
tests/rest/media/v1/test_media_storage.py
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@ -231,9 +231,11 @@ class MediaRepoTests(unittest.HomeserverTestCase):
def prepare(self, reactor, clock, hs):
self.media_repo = hs.get_media_repository_resource()
self.download_resource = self.media_repo.children[b"download"]
self.thumbnail_resource = self.media_repo.children[b"thumbnail"]
media_resource = hs.get_media_repository_resource()
self.download_resource = media_resource.children[b"download"]
self.thumbnail_resource = media_resource.children[b"thumbnail"]
self.store = hs.get_datastore()
self.media_repo = hs.get_media_repository()
self.media_id = "example.com/12345"
@ -357,6 +359,67 @@ class MediaRepoTests(unittest.HomeserverTestCase):
"""
self._test_thumbnail("scale", None, False)
def test_thumbnail_repeated_thumbnail(self):
"""Test that fetching the same thumbnail works, and deleting the on disk
thumbnail regenerates it.
"""
self._test_thumbnail(
"scale", self.test_image.expected_scaled, self.test_image.expected_found
)
if not self.test_image.expected_found:
return
# Fetching again should work, without re-requesting the image from the
# remote.
params = "?width=32&height=32&method=scale"
channel = make_request(
self.reactor,
FakeSite(self.thumbnail_resource),
"GET",
self.media_id + params,
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(channel.code, 200)
if self.test_image.expected_scaled:
self.assertEqual(
channel.result["body"],
self.test_image.expected_scaled,
channel.result["body"],
)
# Deleting the thumbnail on disk then re-requesting it should work as
# Synapse should regenerate missing thumbnails.
origin, media_id = self.media_id.split("/")
info = self.get_success(self.store.get_cached_remote_media(origin, media_id))
file_id = info["filesystem_id"]
thumbnail_dir = self.media_repo.filepaths.remote_media_thumbnail_dir(
origin, file_id
)
shutil.rmtree(thumbnail_dir, ignore_errors=True)
channel = make_request(
self.reactor,
FakeSite(self.thumbnail_resource),
"GET",
self.media_id + params,
shorthand=False,
await_result=False,
)
self.pump()
self.assertEqual(channel.code, 200)
if self.test_image.expected_scaled:
self.assertEqual(
channel.result["body"],
self.test_image.expected_scaled,
channel.result["body"],
)
def _test_thumbnail(self, method, expected_body, expected_found):
params = "?width=32&height=32&method=" + method
channel = make_request(