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Fix up thumbnailing function

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This commit is contained in:
Erik Johnston 2017-10-13 11:23:53 +01:00
parent e3428d26ca
commit 505371414f
3 changed files with 73 additions and 75 deletions
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127
synapse/rest/media/v1/media_repository.py
View File

@ -206,7 +206,7 @@ class MediaRepository(object):
"media_length": content_length,
}
yield self._generate_local_thumbnails(media_id, media_info)
yield self._generate_thumbnails(None, media_id, media_info)
defer.returnValue("mxc://%s/%s" % (self.server_name, media_id))
@ -339,7 +339,7 @@ class MediaRepository(object):
"filesystem_id": file_id,
}
yield self._generate_remote_thumbnails(
yield self._generate_thumbnails(
server_name, media_id, media_info
)
@ -385,6 +385,8 @@ class MediaRepository(object):
)
if t_byte_source:
t_width, t_height = t_byte_source.dimensions
output_path = yield self.write_to_file(
t_byte_source,
self.filepaths.local_media_thumbnail_rel(
@ -414,6 +416,8 @@ class MediaRepository(object):
)
if t_byte_source:
t_width, t_height = t_byte_source.dimensions
output_path = yield self.write_to_file(
t_byte_source,
self.filepaths.remote_media_thumbnail_rel(
@ -432,13 +436,28 @@ class MediaRepository(object):
defer.returnValue(output_path)
@defer.inlineCallbacks
def _generate_local_thumbnails(self, media_id, media_info, url_cache=False):
def _generate_thumbnails(self, server_name, media_id, media_info, url_cache=False):
"""Generate and store thumbnails for an image.
Args:
server_name(str|None): The server name if remote media, else None if local
media_id(str)
media_info(dict)
url_cache(bool): If we are thumbnailing images downloaded for the URL cache,
used exclusively by the url previewer
Returns:
Deferred[dict]: Dict with "width" and "height" keys of original image
"""
media_type = media_info["media_type"]
file_id = media_info.get("filesystem_id")
requirements = self._get_thumbnail_requirements(media_type)
if not requirements:
return
if url_cache:
if server_name:
input_path = self.filepaths.remote_media_filepath(server_name, file_id)
elif url_cache:
input_path = self.filepaths.url_cache_filepath(media_id)
else:
input_path = self.filepaths.local_media_filepath(media_id)
@ -454,22 +473,40 @@ class MediaRepository(object):
)
return
local_thumbnails = []
# We deduplicate the thumbnail sizes by ignoring the cropped versions if
# they have the same dimensions of a scaled one.
thumbnails = {}
for r_width, r_height, r_method, r_type in requirements:
if r_method == "crop":
thumbnails.setdefault[(r_width, r_height)] = (r_method, r_type)
elif r_method == "scale":
t_width, t_height = thumbnailer.aspect(t_width, t_height)
t_width = min(m_width, t_width)
t_height = min(m_height, t_height)
thumbnails[(t_width, t_height)] = (r_method, r_type)
def generate_thumbnails():
for r_width, r_height, r_method, r_type in requirements:
t_byte_source = self._generate_thumbnail(
thumbnailer, r_width, r_height, r_method, r_type,
# Now we generate the thumbnails for each dimension, store it
for (r_width, r_height), (r_method, r_type) in thumbnails.iteritems():
t_byte_source = thumbnailer.crop(t_width, t_height, t_type)
if r_type == "crop":
t_byte_source = yield make_deferred_yieldable(
threads.deferToThread, thumbnailer.crop,
r_width, r_height, r_type,
)
else:
t_byte_source = yield make_deferred_yieldable(
threads.deferToThread, thumbnailer.scale,
r_width, r_height, r_type,
)
local_thumbnails.append((
r_width, r_height, r_method, r_type, t_byte_source
))
t_width, t_height = t_byte_source.dimensions
yield make_deferred_yieldable(threads.deferToThread, generate_thumbnails)
for t_width, t_height, t_method, t_type, t_byte_source in local_thumbnails:
if url_cache:
if server_name:
file_path = self.filepaths.remote_media_thumbnail_rel(
server_name, file_id, t_width, t_height, t_type, t_method
)
elif url_cache:
file_path = self.filepaths.url_cache_thumbnail_rel(
media_id, t_width, t_height, t_type, t_method
)
@ -481,61 +518,15 @@ class MediaRepository(object):
output_path = yield self.write_to_file(t_byte_source, file_path)
t_len = os.path.getsize(output_path)
yield self.store.store_local_thumbnail(
media_id, t_width, t_height, t_type, t_method, t_len
)
defer.returnValue({
"width": m_width,
"height": m_height,
})
@defer.inlineCallbacks
def _generate_remote_thumbnails(self, server_name, media_id, media_info):
media_type = media_info["media_type"]
file_id = media_info["filesystem_id"]
requirements = self._get_thumbnail_requirements(media_type)
if not requirements:
return
remote_thumbnails = []
input_path = self.filepaths.remote_media_filepath(server_name, file_id)
thumbnailer = Thumbnailer(input_path)
m_width = thumbnailer.width
m_height = thumbnailer.height
def generate_thumbnails():
if m_width * m_height >= self.max_image_pixels:
logger.info(
"Image too large to thumbnail %r x %r > %r",
m_width, m_height, self.max_image_pixels
)
return
for r_width, r_height, r_method, r_type in requirements:
t_byte_source = self._generate_thumbnail(
thumbnailer, r_width, r_height, r_method, r_type,
)
remote_thumbnails.append((
r_width, r_height, r_method, r_type, t_byte_source
))
yield make_deferred_yieldable(threads.deferToThread, generate_thumbnails)
for t_width, t_height, t_method, t_type, t_byte_source in remote_thumbnails:
file_path = self.filepaths.remote_media_thumbnail_rel(
server_name, file_id, t_width, t_height, t_type, t_method
)
output_path = yield self.write_to_file(t_byte_source, file_path)
t_len = os.path.getsize(output_path)
yield self.store.store_remote_media_thumbnail(
if server_name:
yield self.store.store_remote_media_thumbnail(
server_name, media_id, file_id,
t_width, t_height, t_type, t_method, t_len
)
else:
yield self.store.store_local_thumbnail(
media_id, t_width, t_height, t_type, t_method, t_len
)
defer.returnValue({
"width": m_width,

8
synapse/rest/media/v1/preview_url_resource.py
View File

@ -171,8 +171,8 @@ class PreviewUrlResource(Resource):
logger.debug("got media_info of '%s'" % media_info)
if _is_media(media_info['media_type']):
dims = yield self.media_repo._generate_local_thumbnails(
media_info['filesystem_id'], media_info, url_cache=True,
dims = yield self.media_repo._generate_thumbnails(
None, media_info['filesystem_id'], media_info, url_cache=True,
)
og = {
@ -217,8 +217,8 @@ class PreviewUrlResource(Resource):
if _is_media(image_info['media_type']):
# TODO: make sure we don't choke on white-on-transparent images
dims = yield self.media_repo._generate_local_thumbnails(
image_info['filesystem_id'], image_info, url_cache=True,
dims = yield self.media_repo._generate_thumbnails(
None, image_info['filesystem_id'], image_info, url_cache=True,
)
if dims:
og["og:image:width"] = dims['width']

13
synapse/rest/media/v1/thumbnailer.py
View File

@ -54,7 +54,7 @@ class Thumbnailer(object):
"""Rescales the image to the given dimensions.
Returns:
BytesIO: the bytes of the encoded image ready to be written to disk
ImageIO: the bytes of the encoded image ready to be written to disk
"""
scaled = self.image.resize((width, height), Image.ANTIALIAS)
return self._encode_image(scaled, output_type)
@ -71,7 +71,7 @@ class Thumbnailer(object):
max_height: The larget possible height.
Returns:
BytesIO: the bytes of the encoded image ready to be written to disk
ImageIO: the bytes of the encoded image ready to be written to disk
"""
if width * self.height > height * self.width:
scaled_height = (width * self.height) // self.width
@ -92,6 +92,13 @@ class Thumbnailer(object):
return self._encode_image(cropped, output_type)
def _encode_image(self, output_image, output_type):
output_bytes_io = BytesIO()
output_bytes_io = ImageIO(output_image.size)
output_image.save(output_bytes_io, self.FORMATS[output_type], quality=80)
output_image.close()
return output_bytes_io
class ImageIO(BytesIO):
def __init__(self, dimensions):
super(ImageIO, self).__init__()
self.dimensions = dimensions