def thumbnail(self, pk: int, digest: str,
**kwargs: Dict[str, bool]) -> WerkzeugResponse:
"""Get Chart thumbnail
---
get:
description: Compute or get already computed chart thumbnail from cache.
parameters:
- in: path
schema:
type: integer
name: pk
- in: path
schema:
type: string
name: sha
responses:
200:
description: Chart thumbnail image
content:
image/*:
schema:
type: string
format: binary
302:
description: Redirects to the current digest
400:
$ref: '#/components/responses/400'
401:
$ref: '#/components/responses/401'
404:
$ref: '#/components/responses/404'
500:
$ref: '#/components/responses/500'
"""
chart = self.datamodel.get(pk, self._base_filters)
if not chart:
return self.response_404()
if kwargs["rison"].get("force", False):
cache_chart_thumbnail.delay(chart.id, force=True)
return self.response(202, message="OK Async")
# fetch the chart screenshot using the current user and cache if set
screenshot = ChartScreenshot(pk).get_from_cache(cache=thumbnail_cache)
# If not screenshot then send request to compute thumb to celery
if not screenshot:
cache_chart_thumbnail.delay(chart.id, force=True)
return self.response(202, message="OK Async")
# If digests
if chart.digest != digest:
return redirect(
url_for(f"{self.__class__.__name__}.thumbnail",
pk=pk,
digest=chart.digest))
return Response(FileWrapper(screenshot),
mimetype="image/png",
direct_passthrough=True)
def trigger_celery() -> WerkzeugResponse:
logger.info("Triggering screenshot ASYNC")
kwargs = {
"url": chart_url,
"digest": chart.digest,
"force": True,
"window_size": window_size,
"thumb_size": thumb_size,
}
cache_chart_thumbnail.delay(**kwargs)
return self.response(
202, cache_key=cache_key, chart_url=chart_url, image_url=image_url
)
def event_after_chart_changed(_mapper: Mapper, _connection: Connection,
target: Slice) -> None:
url = get_url_path("Superset.slice", slice_id=target.id, standalone="true")
cache_chart_thumbnail.delay(url, target.digest, force=True)
def event_after_chart_changed( # pylint: disable=unused-argument
mapper: Mapper, connection: Connection, target: Slice) -> None:
cache_chart_thumbnail.delay(target.id, force=True)
