+
+pub(crate) fn persist_network(path: &Path, network_graph: &NetworkGraph) -> std::io::Result<()> {
+ let mut tmp_path = path.to_path_buf().into_os_string();
+ tmp_path.push(".tmp");
+ let file = fs::OpenOptions::new().write(true).create(true).open(&tmp_path)?;
+ let write_res = network_graph.write(&mut BufWriter::new(file));
+ if let Err(e) = write_res.and_then(|_| fs::rename(&tmp_path, path)) {
+ let _ = fs::remove_file(&tmp_path);
+ Err(e)
+ } else {
+ Ok(())
+ }
+}
+
+pub(crate) fn read_network(path: &Path, genesis_hash: BlockHash) -> NetworkGraph {
+ if let Ok(file) = File::open(path) {
+ if let Ok(graph) = NetworkGraph::read(&mut BufReader::new(file)) {
+ return graph;
+ }
+ }
+ NetworkGraph::new(genesis_hash)
+}