Make snapshot projections self-diagnosing

internal/server/http/snapshots.go

@@ -5,6 +5,10 @@ import (
 	"time"
 
 	"github.com/go-chi/chi/v5"
+	"github.com/oklog/ulid/v2"
+
+	"gitea.dcglab.co.uk/steve/restic-manager/internal/api"
+	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
 )
 
 // snapshotView is the public JSON shape for a snapshot. Matches the
@@ -26,6 +30,7 @@ type listSnapshotsResponse struct {
 	HostID      string         `json:"host_id"`
 	Count       int            `json:"count"`
 	RefreshedAt *time.Time     `json:"refreshed_at,omitempty"`
+	Stale       bool           `json:"stale"`
 	Snapshots   []snapshotView `json:"snapshots"`
 }
 
@@ -45,7 +50,8 @@ func (s *Server) handleListHostSnapshots(w stdhttp.ResponseWriter, r *stdhttp.Re
 		return
 	}
 
-	if _, err := s.deps.Store.GetHost(r.Context(), hostID); err != nil {
+	host, err := s.deps.Store.GetHost(r.Context(), hostID)
+	if err != nil {
 		writeJSONError(w, stdhttp.StatusNotFound, "host_not_found", "")
 		return
 	}
@@ -61,10 +67,13 @@ func (s *Server) handleListHostSnapshots(w stdhttp.ResponseWriter, r *stdhttp.Re
 		Count:     len(snaps),
 		Snapshots: make([]snapshotView, len(snaps)),
 	}
-	if len(snaps) > 0 {
-		t := snaps[0].RefreshedAt
-		out.RefreshedAt = &t
+	out.RefreshedAt = host.SnapshotRefreshedAt
+	mutationAt, err := s.deps.Store.LatestSuccessfulRepoMutation(r.Context(), hostID)
+	if err != nil {
+		writeJSONError(w, stdhttp.StatusInternalServerError, "internal", "")
+		return
 	}
+	out.Stale = mutationAt != nil && (out.RefreshedAt == nil || out.RefreshedAt.Before(*mutationAt))
 	for i, sn := range snaps {
 		out.Snapshots[i] = snapshotView{
 			ID:        sn.ID,
@@ -80,3 +89,31 @@ func (s *Server) handleListHostSnapshots(w stdhttp.ResponseWriter, r *stdhttp.Re
 
 	writeJSON(w, stdhttp.StatusOK, out)
 }
+
+func (s *Server) handleRefreshHostSnapshots(w stdhttp.ResponseWriter, r *stdhttp.Request) {
+	user, ok := s.requireUser(r)
+	if !ok {
+		writeJSONError(w, stdhttp.StatusUnauthorized, "unauthorised", "")
+		return
+	}
+	hostID := chi.URLParam(r, "id")
+	if _, err := s.deps.Store.GetHost(r.Context(), hostID); err != nil {
+		writeJSONError(w, stdhttp.StatusNotFound, "host_not_found", "")
+		return
+	}
+	if s.deps.Hub == nil || !s.deps.Hub.Connected(hostID) {
+		writeJSONError(w, stdhttp.StatusConflict, "host_offline", "agent is not currently connected")
+		return
+	}
+	env, _ := api.Marshal(api.MsgSnapshotsRefresh, ulid.Make().String(), nil)
+	if err := s.deps.Hub.Send(r.Context(), hostID, env); err != nil {
+		writeJSONError(w, stdhttp.StatusConflict, "host_offline", err.Error())
+		return
+	}
+	now := time.Now().UTC()
+	_ = s.deps.Store.AppendAudit(r.Context(), store.AuditEntry{
+		ID: ulid.Make().String(), UserID: &user.ID, Actor: "user",
+		Action: "host.snapshots_refresh", TargetKind: ptr("host"), TargetID: &hostID, TS: now,
+	})
+	writeJSON(w, stdhttp.StatusAccepted, map[string]string{"status": "refresh_requested"})
+}