Refactor - now wireguard based. (#7)

peer/network_state.go

@@ -0,0 +1,18 @@
+package peer
+
+import "vppn/m"
+
+// loadNetworkState reads a cached network state from disk. Any error (most
+// commonly a missing file on first run) is returned to the caller, which
+// treats it as "no cache available".
+func loadNetworkState(path string) (m.NetworkState, error) {
+	var state m.NetworkState
+	err := loadJSON(path, &state)
+	return state, err
+}
+
+// saveNetworkState writes state to path atomically (see storeJSON), so a crash
+// mid-write cannot leave a corrupt cache.
+func saveNetworkState(path string, state m.NetworkState) error {
+	return storeJSON(path, state)
+}