v0.1.0 (#17)

envd/internal/api/snapshot.go

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: Apache-2.0
+// Modifications by M/S Omukk
+
+package api
+
+import (
+	"net/http"
+)
+
+// PostSnapshotPrepare quiesces continuous goroutines (port scanner, forwarder)
+// and forces a GC cycle before Firecracker takes a VM snapshot. This ensures
+// the Go runtime's page allocator is in a consistent state when vCPUs are frozen.
+//
+// Called by the host agent as a best-effort signal before vm.Pause().
+func (a *API) PostSnapshotPrepare(w http.ResponseWriter, r *http.Request) {
+	defer r.Body.Close()
+
+	if a.portSubsystem != nil {
+		a.portSubsystem.Stop()
+		a.logger.Info().Msg("snapshot/prepare: port subsystem quiesced")
+	}
+
+	w.Header().Set("Cache-Control", "no-store")
+	w.WriteHeader(http.StatusNoContent)
+}