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Session persistence

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This commit is contained in:
Igor Katson 2023-11-25 02:36:19 +00:00
parent e467787c38
commit bec5e1be7f
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GPG key ID: B4EC22B66D61A3F5
7 changed files with 204 additions and 51 deletions
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178
crates/librqbit/src/session.rs
View file

@ -1,5 +1,13 @@
use std::{
borrow::Cow, collections::HashMap, io::Read, net::SocketAddr, path::PathBuf, time::Duration,
borrow::Cow,
collections::{HashMap, HashSet},
fs::{File, OpenOptions},
io::{BufReader, BufWriter, Read},
net::SocketAddr,
path::PathBuf,
str::FromStr,
sync::Arc,
time::Duration,
};
use anyhow::{bail, Context};
@ -12,13 +20,14 @@ use librqbit_core::{
};
use parking_lot::RwLock;
use reqwest::Url;
use serde::{Deserialize, Serialize};
use tokio_stream::StreamExt;
use tracing::{debug, error_span, info, warn};
use tracing::{debug, error, error_span, info, warn};
use crate::{
dht_utils::{read_metainfo_from_peer_receiver, ReadMetainfoResult},
peer_connection::PeerConnectionOptions,
spawn_utils::BlockingSpawner,
spawn_utils::{spawn, BlockingSpawner},
torrent_state::{ManagedTorrentBuilder, ManagedTorrentHandle, ManagedTorrentState},
};
@ -27,26 +36,62 @@ pub const SUPPORTED_SCHEMES: [&str; 3] = ["http:", "https:", "magnet:"];
pub type TorrentId = usize;
#[derive(Default)]
pub struct SessionLocked {
pub struct SessionDatabase {
next_id: usize,
torrents: HashMap<usize, ManagedTorrentHandle>,
}
impl SessionLocked {
impl SessionDatabase {
fn add_torrent(&mut self, torrent: ManagedTorrentHandle) -> TorrentId {
let idx = self.next_id;
self.torrents.insert(idx, torrent);
self.next_id += 1;
idx
}
fn serialize(&self) -> SerializedSessionDatabase {
SerializedSessionDatabase {
torrents: self
.torrents
.values()
.map(|torrent| SerializedTorrent {
trackers: torrent
.info()
.trackers
.iter()
.map(|u| u.to_string())
.collect(),
info_hash: torrent.info_hash().as_string(),
only_files: torrent.only_files.clone(),
is_paused: torrent.with_state(|s| matches!(s, ManagedTorrentState::Paused(_))),
output_folder: torrent.info().out_dir.clone(),
})
.collect(),
}
}
}
#[derive(Serialize, Deserialize)]
struct SerializedTorrent {
info_hash: String,
trackers: HashSet<String>,
output_folder: PathBuf,
only_files: Option<Vec<usize>>,
is_paused: bool,
}
#[derive(Serialize, Deserialize)]
struct SerializedSessionDatabase {
torrents: Vec<SerializedTorrent>,
}
pub struct Session {
peer_id: Id20,
dht: Option<Dht>,
persistence_filename: PathBuf,
peer_opts: PeerConnectionOptions,
spawner: BlockingSpawner,
locked: RwLock<SessionLocked>,
db: RwLock<SessionDatabase>,
output_folder: PathBuf,
}
@ -86,6 +131,7 @@ fn compute_only_files<ByteBuf: AsRef<[u8]>>(
#[derive(Default, Clone)]
pub struct AddTorrentOptions {
pub paused: bool,
pub only_files_regex: Option<String>,
pub only_files: Option<Vec<usize>>,
pub overwrite: bool,
@ -164,20 +210,24 @@ impl<'a> AddTorrent<'a> {
pub struct SessionOptions {
pub disable_dht: bool,
pub disable_dht_persistence: bool,
pub persistence: bool,
pub dht_config: Option<PersistentDhtConfig>,
pub peer_id: Option<Id20>,
pub peer_opts: Option<PeerConnectionOptions>,
}
impl Session {
pub async fn new(output_folder: PathBuf, spawner: BlockingSpawner) -> anyhow::Result<Self> {
pub async fn new(
output_folder: PathBuf,
spawner: BlockingSpawner,
) -> anyhow::Result<Arc<Self>> {
Self::new_with_opts(output_folder, spawner, SessionOptions::default()).await
}
pub async fn new_with_opts(
output_folder: PathBuf,
spawner: BlockingSpawner,
opts: SessionOptions,
) -> anyhow::Result<Self> {
) -> anyhow::Result<Arc<Self>> {
let peer_id = opts.peer_id.unwrap_or_else(generate_peer_id);
let dht = if opts.disable_dht {
None
@ -191,25 +241,117 @@ impl Session {
Some(dht)
};
let peer_opts = opts.peer_opts.unwrap_or_default();
Ok(Self {
let session_filename = output_folder.join(".rqbit-session.json");
let session = Arc::new(Self {
persistence_filename: session_filename,
peer_id,
dht,
peer_opts,
spawner,
output_folder,
locked: RwLock::new(SessionLocked::default()),
})
db: RwLock::new(Default::default()),
});
if opts.persistence {
let session = session.clone();
spawn(
"session persistene",
error_span!("session persistence"),
async move {
// Populate initial from the state filename
if let Err(e) = session.populate_from_stored().await {
error!("could not populate session from stored file: {:?}", e);
}
let session = Arc::downgrade(&session);
loop {
tokio::time::sleep(Duration::from_secs(10)).await;
let session = match session.upgrade() {
Some(s) => s,
None => break,
};
if let Err(e) = session.dump_to_disk() {
error!("error dumping session to disk: {:?}", e);
}
}
Ok(())
},
);
}
Ok(session)
}
pub fn get_dht(&self) -> Option<&Dht> {
self.dht.as_ref()
}
async fn populate_from_stored(&self) -> anyhow::Result<()> {
let mut rdr = BufReader::new(
std::fs::File::open(&self.persistence_filename).with_context(|| {
format!("error opening session file {:?}", self.persistence_filename)
})?,
);
let db: SerializedSessionDatabase =
serde_json::from_reader(&mut rdr).context("error deserializing session database")?;
for storrent in db.torrents.into_iter() {
let magnet = Magnet {
info_hash: Id20::from_str(&storrent.info_hash)
.context("error deserializing info_hash")?,
trackers: storrent.trackers.into_iter().collect(),
};
if let Err(e) = self
.add_torrent(
AddTorrent::Url(Cow::Owned(magnet.to_string())),
Some(AddTorrentOptions {
paused: storrent.is_paused,
output_folder: Some(
storrent
.output_folder
.to_str()
.context("broken path")?
.to_owned(),
),
only_files: storrent.only_files,
overwrite: true,
..Default::default()
}),
)
.await
{
error!("error adding torrent from stored session: {:?}", e)
}
}
Ok(())
}
fn dump_to_disk(&self) -> anyhow::Result<()> {
let tmp_filename = format!("{}.tmp", self.persistence_filename.to_str().unwrap());
let mut tmp = BufWriter::new(
std::fs::OpenOptions::new()
.create(true)
.create_new(true)
.truncate(true)
.write(true)
.open(&tmp_filename)
.with_context(|| format!("error opening {:?}", tmp_filename))?,
);
let serialized = self.db.read().serialize();
serde_json::to_writer(&mut tmp, &serialized).context("error serializing")?;
drop(tmp);
std::fs::rename(&tmp_filename, &self.persistence_filename)
.context("error renaming persistence file")?;
debug!("wrote persistence to {:?}", &self.persistence_filename);
Ok(())
}
pub fn with_torrents<R>(
&self,
callback: impl Fn(&mut dyn Iterator<Item = (TorrentId, &ManagedTorrentHandle)>) -> R,
) -> R {
callback(&mut self.locked.read().torrents.iter().map(|(id, t)| (*id, t)))
callback(&mut self.db.read().torrents.iter().map(|(id, t)| (*id, t)))
}
pub async fn add_torrent(
@ -407,7 +549,7 @@ impl Session {
}
let (managed_torrent, id) = {
let mut g = self.locked.write();
let mut g = self.db.write();
if let Some((id, handle)) = g.torrents.iter().find(|(_, t)| t.info_hash() == info_hash)
{
return Ok(AddTorrentResponse::AlreadyManaged(*id, handle.clone()));
@ -422,7 +564,7 @@ impl Session {
let span = managed_torrent.info.span.clone();
let _ = span.enter();
managed_torrent
.start(initial_peers, dht_peer_rx)
.start(initial_peers, dht_peer_rx, opts.paused)
.context("error starting torrent")?;
}
@ -430,12 +572,12 @@ impl Session {
}
pub fn get(&self, id: TorrentId) -> Option<ManagedTorrentHandle> {
self.locked.read().torrents.get(&id).cloned()
self.db.read().torrents.get(&id).cloned()
}
pub fn delete(&self, id: TorrentId, delete_files: bool) -> anyhow::Result<()> {
let removed = self
.locked
.db
.write()
.torrents
.remove(&id)
@ -477,7 +619,7 @@ impl Session {
.as_ref()
.map(|dht| dht.get_peers(handle.info_hash()))
.transpose()?;
handle.start(Default::default(), peer_rx)?;
handle.start(Default::default(), peer_rx, false)?;
Ok(())
}
}

4
crates/librqbit/src/spawn_utils.rs
View file

@ -1,7 +1,7 @@
use tracing::{debug, trace, warn, Instrument};
pub fn spawn(
name: &str,
_name: &str,
span: tracing::Span,
fut: impl std::future::Future<Output = anyhow::Result<()>> + Send + 'static,
) -> tokio::task::JoinHandle<()> {
@ -17,7 +17,7 @@ pub fn spawn(
}
}
.instrument(span.or_current());
tokio::task::Builder::new().name(name).spawn(fut).unwrap()
tokio::task::spawn(fut)
}
#[derive(Clone, Copy, Debug)]

8
crates/librqbit/src/torrent_state/mod.rs
View file

@ -85,7 +85,7 @@ pub struct ManagedTorrentInfo {
pub struct ManagedTorrent {
pub info: Arc<ManagedTorrentInfo>,
only_files: Option<Vec<usize>>,
pub(crate) only_files: Option<Vec<usize>>,
locked: RwLock<ManagedTorrentLocked>,
}
@ -138,6 +138,7 @@ impl ManagedTorrent {
self: &Arc<Self>,
initial_peers: Vec<SocketAddr>,
peer_rx: Option<impl StreamExt<Item = SocketAddr> + Unpin + Send + Sync + 'static>,
start_paused: bool,
) -> anyhow::Result<()> {
let mut g = self.locked.write();
@ -185,6 +186,11 @@ impl ManagedTorrent {
return Ok(());
}
if start_paused {
g.state = ManagedTorrentState::Paused(paused);
return Ok(());
}
let live = TorrentStateLive::new(paused);
g.state = ManagedTorrentState::Live(live.clone());