init

internal/store/stats.go

@@ -0,0 +1,30 @@
+package store
+
+import "context"
+
+// Counts is the summary behind GET /api/v1/system/info.
+type Counts struct {
+	Projects    int64
+	Deployments int64
+	Blobs       int64
+	// CASBytes is the size of the blobs the store believes are on disk. It is
+	// the deduplicated total, so it is smaller — usually much smaller — than the
+	// sum of the deployments' sizes.
+	CASBytes int64
+}
+
+// Counts gathers the summary in one round trip.
+//
+// The subqueries are counted separately rather than joined: a join would have
+// to fan out over deployment_files and then collapse again, which on a large
+// manifest is thousands of times the work for the same four numbers.
+func (d *DB) Counts(ctx context.Context) (Counts, error) {
+	var c Counts
+	err := d.r.QueryRowContext(ctx, `
+		SELECT (SELECT count(*) FROM projects),
+		       (SELECT count(*) FROM deployments),
+		       (SELECT count(*) FROM blobs WHERE present = 1),
+		       (SELECT coalesce(sum(size), 0) FROM blobs WHERE present = 1)`).
+		Scan(&c.Projects, &c.Deployments, &c.Blobs, &c.CASBytes)
+	return c, err
+}