Storage: store uploaded files in SQL rather than on the disk (#49034)

* #48259: set up storages per org id

* #48259: migrate to storage_sql

pkg/services/store/storage_sql.go

@@ -0,0 +1,82 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/grafana/grafana/pkg/infra/filestorage"
+	"github.com/grafana/grafana/pkg/services/sqlstore"
+
+	"github.com/grafana/grafana-plugin-sdk-go/data"
+)
+
+const rootStorageTypeSQL = "sql"
+
+type rootStorageSQL struct {
+	baseStorageRuntime
+
+	settings *StorageSQLConfig
+}
+
+// getDbRootFolder creates a DB path prefix for a given storage name and orgId.
+// example:
+//   orgId: 5
+//   storageName: "upload"
+//     => prefix: "/5/upload/"
+func getDbStoragePathPrefix(orgId int64, storageName string) string {
+	return filestorage.Join(fmt.Sprintf("%d", orgId), storageName+filestorage.Delimiter)
+}
+
+func newSQLStorage(prefix string, name string, cfg *StorageSQLConfig, sql *sqlstore.SQLStore) *rootStorageSQL {
+	if cfg == nil {
+		cfg = &StorageSQLConfig{}
+	}
+
+	meta := RootStorageMeta{
+		Config: RootStorageConfig{
+			Type:   rootStorageTypeSQL,
+			Prefix: prefix,
+			Name:   name,
+			SQL:    cfg,
+		},
+	}
+
+	if prefix == "" {
+		meta.Notice = append(meta.Notice, data.Notice{
+			Severity: data.NoticeSeverityError,
+			Text:     "Missing prefix",
+		})
+	}
+
+	s := &rootStorageSQL{}
+	s.store = filestorage.NewDbStorage(
+		grafanaStorageLogger,
+		sql, nil, getDbStoragePathPrefix(cfg.orgId, prefix))
+
+	meta.Ready = true
+	s.meta = meta
+	s.settings = cfg
+	return s
+}
+
+func (s *rootStorageSQL) Write(ctx context.Context, cmd *WriteValueRequest) (*WriteValueResponse, error) {
+	byteAray := []byte(cmd.Body)
+
+	path := cmd.Path
+	if !strings.HasPrefix(path, filestorage.Delimiter) {
+		path = filestorage.Delimiter + path
+	}
+	err := s.store.Upsert(ctx, &filestorage.UpsertFileCommand{
+		Path:     path,
+		Contents: byteAray,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &WriteValueResponse{Code: 200}, nil
+}
+
+func (s *rootStorageSQL) Sync() error {
+	return nil // already in sync
+}