_ 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::routing::scorer::Scorer;
   7 use lightning::util::logger::{Logger, Record};
   8 use lightning::util::ser::{Readable, Writeable, Writer};
   9 use std::collections::HashMap;
  10 use std::fs;
  11 use std::fs::File;
  12 use std::io::{BufRead, BufReader, BufWriter};
  13 use std::net::SocketAddr;
  14 use std::path::Path;
  15
  16 pub(crate) struct FilesystemLogger {
  17         data_dir: String,
  18 }
  19 impl FilesystemLogger {
  20         pub(crate) fn new(data_dir: String) -> Self {
  21                 let logs_path = format!("{}/logs", data_dir);
  22                 fs::create_dir_all(logs_path.clone()).unwrap();
  23                 Self { data_dir: logs_path }
  24         }
  25 }
  26 impl Logger for FilesystemLogger {
  27         fn log(&self, record: &Record) {
  28                 let raw_log = record.args.to_string();
  29                 let log = format!(
  30                         "{} {:<5} [{}:{}] {}\n",
  31                         // Note that a "real" lightning node almost certainly does *not* want subsecond
  32                         // precision for message-receipt information as it makes log entries a target for
  33                         // deanonymization attacks. For testing, however, its quite useful.
  34                         Utc::now().format("%Y-%m-%d %H:%M:%S%.3f"),
  35                         record.level.to_string(),
  36                         record.module_path,
  37                         record.line,
  38                         raw_log
  39                 );
  40                 let logs_file_path = format!("{}/logs.txt", self.data_dir.clone());
  41                 fs::OpenOptions::new()
  42                         .create(true)
  43                         .append(true)
  44                         .open(logs_file_path)
  45                         .unwrap()
  46                         .write_all(log.as_bytes())
  47                         .unwrap();
  48         }
  49 }
  50 pub(crate) fn persist_channel_peer(path: &Path, peer_info: &str) -> std::io::Result<()> {
  51         let mut file = fs::OpenOptions::new().create(true).append(true).open(path)?;
  52         file.write_all(format!("{}\n", peer_info).as_bytes())
  53 }
  54
  55 pub(crate) fn read_channel_peer_data(
  56         path: &Path,
  57 ) -> Result<HashMap<PublicKey, SocketAddr>, std::io::Error> {
  58         let mut peer_data = HashMap::new();
  59         if !Path::new(&path).exists() {
  60                 return Ok(HashMap::new());
  61         }
  62         let file = File::open(path)?;
  63         let reader = BufReader::new(file);
  64         for line in reader.lines() {
  65                 match cli::parse_peer_info(line.unwrap()) {
  66                         Ok((pubkey, socket_addr)) => {
  67                                 peer_data.insert(pubkey, socket_addr);
  68                         }
  69                         Err(e) => return Err(e),
  70                 }
  71         }
  72         Ok(peer_data)
  73 }
  74
  75 pub(crate) fn persist_network(path: &Path, network_graph: &NetworkGraph) -> std::io::Result<()> {
  76         let mut tmp_path = path.to_path_buf().into_os_string();
  77         tmp_path.push(".tmp");
  78         let file = fs::OpenOptions::new().write(true).create(true).open(&tmp_path)?;
  79         let write_res = network_graph.write(&mut BufWriter::new(file));
  80         if let Err(e) = write_res.and_then(|_| fs::rename(&tmp_path, path)) {
  81                 let _ = fs::remove_file(&tmp_path);
  82                 Err(e)
  83         } else {
  84                 Ok(())
  85         }
  86 }
  87
  88 pub(crate) fn read_network(path: &Path, genesis_hash: BlockHash) -> NetworkGraph {
  89         if let Ok(file) = File::open(path) {
  90                 if let Ok(graph) = NetworkGraph::read(&mut BufReader::new(file)) {
  91                         return graph;
  92                 }
  93         }
  94         NetworkGraph::new(genesis_hash)
  95 }
  96
  97 pub(crate) fn persist_scorer(path: &Path, scorer: &Scorer) -> std::io::Result<()> {
  98         let mut tmp_path = path.to_path_buf().into_os_string();
  99         tmp_path.push(".tmp");
 100         let file = fs::OpenOptions::new().write(true).create(true).open(&tmp_path)?;
 101         let write_res = scorer.write(&mut BufWriter::new(file));
 102         if let Err(e) = write_res.and_then(|_| fs::rename(&tmp_path, path)) {
 103                 let _ = fs::remove_file(&tmp_path);
 104                 Err(e)
 105         } else {
 106                 Ok(())
 107         }
 108 }
 109
 110 pub(crate) fn read_scorer(path: &Path) -> Scorer {
 111         if let Ok(file) = File::open(path) {
 112                 if let Ok(scorer) = Scorer::read(&mut BufReader::new(file)) {
 113                         return scorer;
 114                 }
 115         }
 116         Scorer::default()
 117 }