craig-rueda commented on a change in pull request #8947: [thumbnails]
thumbnails for dashboards and charts
URL:
https://github.com/apache/incubator-superset/pull/8947#discussion_r391077356
##########
File path: superset/views/chart/api.py
##########
@@ -173,3 +189,62 @@ class ChartRestApi(SliceMixin, BaseOwnedModelRestApi):
"owners": ("first_name", "asc"),
}
filter_rel_fields_field = {"owners": "first_name", "dashboards":
"dashboard_title"}
+
+ def __init__(self, *args, **kwargs):
+ if is_feature_enabled("THUMBNAILS"):
+ self.include_route_methods = self.include_route_methods |
{"thumbnail"}
+ super().__init__(*args, **kwargs)
+
+ @expose("/<pk>/thumbnail/<digest>/", methods=["GET"])
+ @protect()
+ @rison(thumbnail_query_schema)
+ @safe
+ def thumbnail(self, pk, digest, **kwargs): # pylint: disable=invalid-name
+ """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
+ 401:
+ $ref: '#/components/responses/401'
+ 404:
+ $ref: '#/components/responses/404'
+ 422:
+ $ref: '#/components/responses/422'
+ 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.unique_value != digest:
+ logger.info("Requested thumbnail digest differs from actual
digest")
+ return Response(
Review comment:
It's always better to return a 304 :). The digest will change when the
underlying thumbnail does, I'm assuming. Therefore the frontend will bust
through anything that's cached on update.
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