def measure(value):
if value.proportion is None:
pause = 0.5
for i in xrange(4):
try:
fetched_image = yield ctx.urlfetch('%s=s100' % value.serving_url) # http://stackoverflow.com/q/14944317/376238
break
except Exception as e:
time.sleep(pause)
pause = pause * 2
image = images.Image(image_data=fetched_image.content)
value.proportion = float(image.width) / float(image.height)
raise orm.Return(True)
def process_image(value, i, values):
config = self._process_config
new_value = value
gs_object_name = new_value.gs_object_name
new_gs_object_name = new_value.gs_object_name
if config.get('copy'):
new_value = copy.deepcopy(value)
new_gs_object_name = '%s_%s' % (new_value.gs_object_name, config.get('copy_name'))
blob_key = None
# @note No try block is implemented here. This code is no longer forgiving.
# If any of the images fail to process, everything is lost/reverted, because one or more images:
# - are no longer existant in the cloudstorage / .read();
# - are not valid / not image exception;
# - failed to resize / resize could not be done;
# - failed to create gs key / blobstore failed for some reason;
# - failed to create get_serving_url / serving url service failed for some reason;
# - failed to write to cloudstorage / cloudstorage failed for some reason.
readonly_blob = cloudstorage.open(gs_object_name[3:], 'r')
blob = readonly_blob.read()
readonly_blob.close()
image = images.Image(image_data=blob)
if config.get('transform'):
image.resize(config.get('width'),
config.get('height'),
crop_to_fit=config.get('crop_to_fit', False),
crop_offset_x=config.get('crop_offset_x', 0.0),
crop_offset_y=config.get('crop_offset_y', 0.0))
blob = yield image.execute_transforms_async(output_encoding=image.format)
new_value.proportion = float(image.width) / float(image.height)
new_value.size = len(blob)
writable_blob = cloudstorage.open(new_gs_object_name[3:], 'w', content_type=new_value.content_type)
writable_blob.write(blob)
writable_blob.close()
if gs_object_name != new_gs_object_name:
new_value.gs_object_name = new_gs_object_name
blob_key = yield blobstore.create_gs_key_async(new_gs_object_name)
new_value.image = blobstore.BlobKey(blob_key)
new_value.serving_url = None
values[i] = new_value
raise orm.Return(True)
def async(entity):
gs_object_name = entity.gs_object_name
try:
gs_object_name = entity.parse_duplicate_appendix(gs_object_name)
except IndexError:
pass
new_gs_object_name = '%s_duplicate_%s' % (gs_object_name, entity.duplicate_appendix)
readonly_blob = cloudstorage.open(gs_object_name[3:], 'r')
writable_blob = cloudstorage.open(new_gs_object_name[3:], 'w', content_type=entity.content_type)
# Less consuming memory write, can be only used when using brute force copy.
# There is no copy feature in cloudstorage sdk, so we have to implement our own!
while True:
blob_segment = readonly_blob.read(1000000) # Read 1mb per write, that should be enough.
if not blob_segment:
break
writable_blob.write(blob_segment)
readonly_blob.close()
writable_blob.close()
entity.gs_object_name = new_gs_object_name
blob_key = yield blobstore.create_gs_key_async(new_gs_object_name)
entity.image = blobstore.BlobKey(blob_key)
entity.serving_url = yield images.get_serving_url_async(entity.image)
self._property.save_blobs_on_success(entity.image)
raise orm.Return(entity)
def mapper(values):
for i, v in enumerate(values):
yield process_image(v, i, values)
raise orm.Return(True)
def mapper(values): yield map(measure, values) raise orm.Return(True)
def mapper(values): yield map(generate, values) raise orm.Return(True)
def generate(value):
if value.serving_url is None:
value.serving_url = yield images.get_serving_url_async(value.image)
raise orm.Return(True)
def mapper(entities): out = yield map(async, entities) raise orm.Return(out)
