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