Evict remote objects from every cache layer

DELETE /objects only removed the artifacts row, so mutable indexes (S3
index object + Redis TTL/ETag keys) kept being served. Clear all layers
and treat a trailing * as a prefix.

internal/api/v2/objects.go

@@ -1,6 +1,7 @@
 package v2
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"strconv"
@@ -10,12 +11,18 @@ import (
 	"git.unkin.net/unkin/artifactapi/internal/database"
 )
 
-type ObjectsHandler struct {
-	db *database.DB
+// Evictor drops a remote path from every cache layer.
+type Evictor interface {
+	Evict(ctx context.Context, remoteName, path string) error
 }
 
-func NewObjectsHandler(db *database.DB) *ObjectsHandler {
-	return &ObjectsHandler{db: db}
+type ObjectsHandler struct {
+	db      *database.DB
+	evictor Evictor
+}
+
+func NewObjectsHandler(db *database.DB, evictor Evictor) *ObjectsHandler {
+	return &ObjectsHandler{db: db, evictor: evictor}
 }
 
 func (h *ObjectsHandler) Routes() chi.Router {
@@ -86,7 +93,7 @@ func (h *ObjectsHandler) evict(w http.ResponseWriter, r *http.Request) {
 	remoteName := chi.URLParam(r, "name")
 	path := chi.URLParam(r, "*")
 
-	if err := h.db.DeleteArtifact(r.Context(), remoteName, path); err != nil {
+	if err := h.evictor.Evict(r.Context(), remoteName, path); err != nil {
 		http.Error(w, fmt.Sprintf("evict failed: %v", err), http.StatusInternalServerError)
 		return
 	}