_ Git - ldk-sample/blob - src/disk.rs

   1 use crate::cli;
   2 use bitcoin::secp256k1::key::PublicKey;
   3 use bitcoin::BlockHash;
   4 use chrono::Utc;
   5 use lightning::routing::network_graph::NetworkGraph;
   6 use lightning::util::logger::{Logger, Record};
   7 use lightning::util::ser::{Readable, Writeable, Writer};
   8 use std::collections::HashMap;
   9 use std::fs;
  10 use std::fs::File;
  11 use std::io::{BufRead, BufReader, BufWriter};
  12 use std::net::SocketAddr;
  13 use std::path::Path;
  14
  15 pub(crate) struct FilesystemLogger {
  16         data_dir: String,
  17 }
  18 impl FilesystemLogger {
  19         pub(crate) fn new(data_dir: String) -> Self {
  20                 let logs_path = format!("{}/logs", data_dir);
  21                 fs::create_dir_all(logs_path.clone()).unwrap();
  22                 Self { data_dir: logs_path }
  23         }
  24 }
  25 impl Logger for FilesystemLogger {
  26         fn log(&self, record: &Record) {
  27                 let raw_log = record.args.to_string();
  28                 let log = format!(
  29                         "{} {:<5} [{}:{}] {}\n",
  30                         // Note that a "real" lightning node almost certainly does *not* want subsecond
  31                         // precision for message-receipt information as it makes log entries a target for
  32                         // deanonymization attacks. For testing, however, its quite useful.
  33                         Utc::now().format("%Y-%m-%d %H:%M:%S%.3f"),
  34                         record.level.to_string(),
  35                         record.module_path,
  36                         record.line,
  37                         raw_log
  38                 );
  39                 let logs_file_path = format!("{}/logs.txt", self.data_dir.clone());
  40                 fs::OpenOptions::new()
  41                         .create(true)
  42                         .append(true)
  43                         .open(logs_file_path)
  44                         .unwrap()
  45                         .write_all(log.as_bytes())
  46                         .unwrap();
  47         }
  48 }
  49 pub(crate) fn persist_channel_peer(path: &Path, peer_info: &str) -> std::io::Result<()> {
  50         let mut file = fs::OpenOptions::new().create(true).append(true).open(path)?;
  51         file.write_all(format!("{}\n", peer_info).as_bytes())
  52 }
  53
  54 pub(crate) fn read_channel_peer_data(
  55         path: &Path,
  56 ) -> Result<HashMap<PublicKey, SocketAddr>, std::io::Error> {
  57         let mut peer_data = HashMap::new();
  58         if !Path::new(&path).exists() {
  59                 return Ok(HashMap::new());
  60         }
  61         let file = File::open(path)?;
  62         let reader = BufReader::new(file);
  63         for line in reader.lines() {
  64                 match cli::parse_peer_info(line.unwrap()) {
  65                         Ok((pubkey, socket_addr)) => {
  66                                 peer_data.insert(pubkey, socket_addr);
  67                         }
  68                         Err(e) => return Err(e),
  69                 }
  70         }
  71         Ok(peer_data)
  72 }
  73
  74 pub(crate) fn persist_network(path: &Path, network_graph: &NetworkGraph) -> std::io::Result<()> {
  75         let mut tmp_path = path.to_path_buf().into_os_string();
  76         tmp_path.push(".tmp");
  77         let file = fs::OpenOptions::new().write(true).create(true).open(&tmp_path)?;
  78         let write_res = network_graph.write(&mut BufWriter::new(file));
  79         if let Err(e) = write_res.and_then(|_| fs::rename(&tmp_path, path)) {
  80                 let _ = fs::remove_file(&tmp_path);
  81                 Err(e)
  82         } else {
  83                 Ok(())
  84         }
  85 }
  86
  87 pub(crate) fn read_network(path: &Path, genesis_hash: BlockHash) -> NetworkGraph {
  88         if let Ok(file) = File::open(path) {
  89                 if let Ok(graph) = NetworkGraph::read(&mut BufReader::new(file)) {
  90                         return graph;
  91                 }
  92         }
  93         NetworkGraph::new(genesis_hash)
  94 }