Previews: crawler as a background service (#44891)

* add SQL migrations

* dashboard previews from sql: poc

* added todos

* refactor: use the same enums where possible

* use useEffect, always return json

* added todo

* refactor + delete files after use

* refactor + fix manual thumbnail upload

* refactor: move all interactions with sqlStore to thumbnail repo

* refactor: remove file operations in thumb crawler/service

* refactor: fix dashboard_thumbs sql store

* refactor: extracted thumbnail fetching/updating to a hook

* refactor: store thumbnails in redux store

* refactor: store thumbnails in redux store

* refactor: private'd repo methods

* removed redux storage, saving images as blobs

* allow for configurable rendering timeouts

* added 1) query for dashboards with stale thumbnails, 2) command for marking thumbnails as stale

* use sql-based queue in crawler

* ui for marking thumbnails as stale

* replaced `stale` boolean prop with `state` enum

* introduce rendering session

* compilation errors

* fix crawler stop button

* rename thumbnail state frozen to locked

* #44449: fix merge conflicts

* #44449: remove thumb methods from `Store` interface

* #44449: clean filepath, defer file closing

* #44449: fix rendering.Theme cyclic import

* #44449: linting

* #44449: linting

* #44449: mutex'd crawlerStatus access

* #44449: added integration tests for `sqlstore.dashboard_thumbs`

* #44449: added comments to explain the `ThumbnailState` enum

* #44449: use os.ReadFile rather then os.Open

* #44449: always enable dashboardPreviews feature during integration tests

* #44449: remove sleep time, adjust number of threads

* #44449: review fix: add `orgId` to `DashboardThumbnailMeta`

* #44449: review fix: automatic parsing of thumbnailState

* #44449: lint fixes

* #44449: crawler as a background service v0.1

* #44449: use ServerLockService

* #44449: use ServerLockService

* #44449: review fix: prefer `WithDbSession` over `WithTransactionalDbSession`

* #44449: review fix: add a comment explaining source of the filepath

* #44449: review fix: added filepath validation

* #44449: fix FindDashboardsWithStaleThumbnails to include `theme` and `kind` in search params

* #44449: fix FindDashboardsWithStaleThumbnails to include `theme` and `kind` in search params

* #44449: create function for crawler on demand

* #44449: improve crawler logging

* #44449: fix wire

* #44449: uncomment dummy thumb service, fix ticker interval

* #44449: prevent race condition

* #44449: improve logging

* #44449: fix theme

* #44449: review fixes https://github.com/grafana/grafana/pull/45063/files @fzambia

* #44449: add missing unlock

* #44449: merge

* #44449: review fix - logger @fzambia https://github.com/grafana/grafana/pull/45063/files

* #44449: formatting

* #44449: merge conflict fix

* #44449: merge conflict fix

* #44449: merge conflict fix

* #44449: naming fix

* #44449: update authOpts

* #44449: change authOpts.role back to admin

* #44449: fix `walk` signature, move ctx to a first argument

* #44449: add `dashboardPreviewsScheduler` feature flag

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>
Co-authored-by: Alexander Emelin <frvzmb@gmail.com>

pkg/server/backgroundsvcs/background_services.go

@@ -22,6 +22,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/rendering"
 	secretsManager "github.com/grafana/grafana/pkg/services/secrets/manager"
 	"github.com/grafana/grafana/pkg/services/serviceaccounts"
+	"github.com/grafana/grafana/pkg/services/thumbs"
 	"github.com/grafana/grafana/pkg/services/updatechecker"
 )
 
@@ -32,7 +33,7 @@ func ProvideBackgroundServiceRegistry(
 	provisioning *provisioning.ProvisioningServiceImpl, alerting *alerting.AlertEngine, usageStats *uss.UsageStats,
 	grafanaUpdateChecker *updatechecker.GrafanaService, pluginsUpdateChecker *updatechecker.PluginsService,
 	metrics *metrics.InternalMetricsService, secretsService *secretsManager.SecretsService,
-	remoteCache *remotecache.RemoteCache,
+	remoteCache *remotecache.RemoteCache, thumbnailsService thumbs.Service,
 	// Need to make sure these are initialized, is there a better place to put them?
 	_ *plugindashboards.Service, _ *dashboardsnapshots.Service, _ *pluginsettings.Service,
 	_ *alerting.AlertNotificationService, _ serviceaccounts.Service,
@@ -55,7 +56,8 @@ func ProvideBackgroundServiceRegistry(
 		usageStats,
 		tracing,
 		remoteCache,
-		secretsService)
+		secretsService,
+		thumbnailsService)
 }
 
 // BackgroundServiceRegistry provides background services.