def thumbnail(self, pk: int, digest: str,
**kwargs: Any) -> WerkzeugResponse:
"""Get Dashboard thumbnail
---
get:
description: >-
Compute async or get already computed dashboard thumbnail from cache.
parameters:
- in: path
schema:
type: integer
name: pk
- in: path
name: digest
description: A hex digest that makes this dashboard unique
schema:
type: string
- in: query
name: q
content:
application/json:
schema:
$ref: '#/components/schemas/thumbnail_query_schema'
responses:
200:
description: Dashboard thumbnail image
content:
image/*:
schema:
type: string
format: binary
202:
description: Thumbnail does not exist on cache, fired async to compute
content:
application/json:
schema:
type: object
properties:
message:
type: string
302:
description: Redirects to the current digest
401:
$ref: '#/components/responses/401'
404:
$ref: '#/components/responses/404'
422:
$ref: '#/components/responses/422'
500:
$ref: '#/components/responses/500'
"""
dashboard = self.datamodel.get(pk, self._base_filters)
if not dashboard:
return self.response_404()
dashboard_url = get_url_path("Superset.dashboard",
dashboard_id_or_slug=dashboard.id)
# If force, request a screenshot from the workers
if kwargs["rison"].get("force", False):
cache_dashboard_thumbnail.delay(dashboard_url,
dashboard.digest,
force=True)
return self.response(202, message="OK Async")
# fetch the dashboard screenshot using the current user and cache if set
screenshot = DashboardScreenshot(
dashboard_url,
dashboard.digest).get_from_cache(cache=thumbnail_cache)
# If the screenshot does not exist, request one from the workers
if not screenshot:
self.incr_stats("async", self.thumbnail.__name__)
cache_dashboard_thumbnail.delay(dashboard_url,
dashboard.digest,
force=True)
return self.response(202, message="OK Async")
# If digests
if dashboard.digest != digest:
self.incr_stats("redirect", self.thumbnail.__name__)
return redirect(
url_for(
f"{self.__class__.__name__}.thumbnail",
pk=pk,
digest=dashboard.digest,
))
self.incr_stats("from_cache", self.thumbnail.__name__)
return Response(FileWrapper(screenshot),
mimetype="image/png",
direct_passthrough=True)
def event_after_dashboard_changed( # pylint: disable=unused-argument
mapper: Mapper, connection: Connection, target: Dashboard
) -> None:
cache_dashboard_thumbnail.delay(target.id, force=True)
def event_after_dashboard_changed(
_mapper: Mapper, _connection: Connection, target: Dashboard
) -> None:
url = get_url_path("Superset.dashboard", dashboard_id_or_slug=target.id)
cache_dashboard_thumbnail.delay(url, target.digest, force=True)
def update_thumbnail(self) -> None:
url = get_url_path("Superset.dashboard", dashboard_id_or_slug=self.id)
cache_dashboard_thumbnail.delay(url, self.digest, force=True)
def event_after_dashboard_changed( # pylint: disable=unused-argument
mapper: Mapper, connection: Connection, target: Dashboard
) -> None:
url = get_url_path("Superset.dashboard", dashboard_id=target.id)
cache_dashboard_thumbnail.delay(url, target.digest, force=True)
