BitVFactory going on

crates/librqbit/src/bitv.rs

@@ -3,11 +3,13 @@ use std::fs::File;
 use anyhow::Context;
 use bitvec::{order::Lsb0, slice::BitSlice, vec::BitVec, view::AsBits, view::AsMutBits};
 
+#[async_trait::async_trait]
 pub trait BitV: Send {
     fn as_slice(&self) -> &BitSlice<u8, Lsb0>;
     fn as_slice_mut(&mut self) -> &mut BitSlice<u8, Lsb0>;
-    fn flush(&mut self) -> anyhow::Result<()>;
     fn into_dyn(self) -> Box<dyn BitV>;
+
+    async fn flush(&mut self) -> anyhow::Result<()>;
 }
 
 pub struct MmapBitV {
@@ -23,6 +25,7 @@ impl MmapBitV {
     }
 }
 
+#[async_trait::async_trait]
 impl BitV for BitVec<u8, Lsb0> {
     fn as_slice(&self) -> &BitSlice<u8, Lsb0> {
         self.as_bitslice()
@@ -32,7 +35,7 @@ impl BitV for BitVec<u8, Lsb0> {
         self.as_mut_bitslice()
     }
 
-    fn flush(&mut self) -> anyhow::Result<()> {
+    async fn flush(&mut self) -> anyhow::Result<()> {
         Ok(())
     }
 
@@ -41,6 +44,7 @@ impl BitV for BitVec<u8, Lsb0> {
     }
 }
 
+#[async_trait::async_trait]
 impl BitV for MmapBitV {
     fn as_slice(&self) -> &BitSlice<u8, Lsb0> {
         self.mmap.as_bits()
@@ -50,7 +54,7 @@ impl BitV for MmapBitV {
         self.mmap.as_mut_bits()
     }
 
-    fn flush(&mut self) -> anyhow::Result<()> {
+    async fn flush(&mut self) -> anyhow::Result<()> {
         Ok(self.mmap.flush()?)
     }
 
@@ -59,6 +63,7 @@ impl BitV for MmapBitV {
     }
 }
 
+#[async_trait::async_trait]
 impl BitV for Box<dyn BitV> {
     fn as_slice(&self) -> &BitSlice<u8, Lsb0> {
         (**self).as_slice()
@@ -68,8 +73,8 @@ impl BitV for Box<dyn BitV> {
         (**self).as_slice_mut()
     }
 
-    fn flush(&mut self) -> anyhow::Result<()> {
-        (**self).flush()
+    async fn flush(&mut self) -> anyhow::Result<()> {
+        (**self).flush().await
     }
 
     fn into_dyn(self) -> Box<dyn BitV> {

crates/librqbit/src/bitv_factory.rs

@@ -0,0 +1,29 @@
+use bitvec::{order::Lsb0, vec::BitVec};
+
+use crate::{api::TorrentIdOrHash, bitv::BitV};
+
+#[async_trait::async_trait]
+pub trait BitVFactory: Send {
+    async fn load(&self, id: TorrentIdOrHash) -> anyhow::Result<Option<Box<dyn BitV>>>;
+    async fn store_initial_check(
+        &self,
+        id: TorrentIdOrHash,
+        b: BitVec<u8, Lsb0>,
+    ) -> anyhow::Result<Box<dyn BitV>>;
+}
+
+pub struct NonPersistentBitVFactory {}
+
+#[async_trait::async_trait]
+impl BitVFactory for NonPersistentBitVFactory {
+    async fn load(&self, _: TorrentIdOrHash) -> anyhow::Result<Option<Box<dyn BitV>>> {
+        Ok(None)
+    }
+    async fn store_initial_check(
+        &self,
+        id: TorrentIdOrHash,
+        b: BitVec<u8, Lsb0>,
+    ) -> anyhow::Result<Box<dyn BitV>> {
+        Ok(Box::new(b))
+    }
+}

crates/librqbit/src/lib.rs

@@ -41,6 +41,7 @@ macro_rules! aframe {
 pub mod api;
 mod api_error;
 mod bitv;
+mod bitv_factory;
 mod chunk_tracker;
 mod create_torrent_file;
 mod dht_utils;

crates/librqbit/src/session_persistence/json.rs

@@ -1,11 +1,17 @@
 use std::{any::TypeId, collections::HashMap, path::PathBuf};
 
 use crate::{
-    session::TorrentId, storage::filesystem::FilesystemStorageFactory,
-    torrent_state::ManagedTorrentHandle, ManagedTorrentState,
+    api::TorrentIdOrHash,
+    bitv::{BitV, MmapBitV},
+    bitv_factory::BitVFactory,
+    session::TorrentId,
+    storage::filesystem::FilesystemStorageFactory,
+    torrent_state::ManagedTorrentHandle,
+    ManagedTorrentState,
 };
 use anyhow::{bail, Context};
 use async_trait::async_trait;
+use bitvec::{order::Lsb0, vec::BitVec};
 use futures::{stream::BoxStream, StreamExt};
 use itertools::Itertools;
 use librqbit_core::Id20;
@@ -65,6 +71,34 @@ impl JsonSessionPersistenceStore {
         })
     }
 
+    async fn to_id(&self, id: TorrentIdOrHash) -> anyhow::Result<TorrentId> {
+        match id {
+            TorrentIdOrHash::Id(id) => Ok(id),
+            TorrentIdOrHash::Hash(h) => self
+                .db_content
+                .read()
+                .await
+                .torrents
+                .iter()
+                .find_map(|(k, v)| if v.info_hash() == &h { Some(*k) } else { None })
+                .context("not found"),
+        }
+    }
+
+    async fn to_hash(&self, id: TorrentIdOrHash) -> anyhow::Result<Id20> {
+        match id {
+            TorrentIdOrHash::Id(id) => self
+                .db_content
+                .read()
+                .await
+                .torrents
+                .get(&id)
+                .map(|v| *v.info_hash())
+                .context("not found"),
+            TorrentIdOrHash::Hash(h) => Ok(h),
+        }
+    }
+
     async fn flush(&self) -> anyhow::Result<()> {
         let tmp_filename = format!("{}.tmp", self.db_filename.to_str().unwrap());
         let mut tmp = tokio::fs::OpenOptions::new()
@@ -97,6 +131,10 @@ impl JsonSessionPersistenceStore {
         self.output_folder.join(format!("{:?}.torrent", info_hash))
     }
 
+    fn bitv_filename(&self, info_hash: &Id20) -> PathBuf {
+        self.output_folder.join(format!("{:?}.bitv", info_hash))
+    }
+
     async fn update_db(
         &self,
         id: TorrentId,
@@ -152,6 +190,49 @@ impl JsonSessionPersistenceStore {
     }
 }
 
+#[async_trait::async_trait]
+impl BitVFactory for JsonSessionPersistenceStore {
+    async fn load(&self, id: TorrentIdOrHash) -> anyhow::Result<Option<Box<dyn BitV>>> {
+        let h = self.to_hash(id).await?;
+        let filename = self.bitv_filename(&h);
+        let f = match std::fs::OpenOptions::new().write(true).open(&filename) {
+            Ok(f) => f,
+            Err(e) => match e.kind() {
+                std::io::ErrorKind::NotFound => return Ok(None),
+                _ => return Err(e).with_context(|| format!("error opening {filename:?}")),
+            },
+        };
+        Ok(Some(MmapBitV::new(f)?.into_dyn()))
+    }
+
+    async fn store_initial_check(
+        &self,
+        id: TorrentIdOrHash,
+        b: BitVec<u8, Lsb0>,
+    ) -> anyhow::Result<Box<dyn BitV>> {
+        let h = self.to_hash(id).await?;
+        let filename = self.bitv_filename(&h);
+        let tmp_filename = format!("{}.tmp", filename.to_str().context("bug")?);
+        let mut dst = tokio::fs::OpenOptions::new()
+            .write(true)
+            .create(true)
+            .truncate(true)
+            .open(&filename)
+            .await
+            .with_context(|| format!("error opening {filename:?}"))?;
+        let b = b.into_vec();
+        tokio::io::copy(&mut &b[..], &mut dst)
+            .await
+            .context("error writing bitslice to {filename:?}")?;
+        tokio::fs::rename(tmp_filename, &filename).await?;
+        let f = std::fs::OpenOptions::new()
+            .write(true)
+            .open(&filename)
+            .with_context(|| format!("error opening {filename:?}"))?;
+        Ok(MmapBitV::new(f)?.into_dyn())
+    }
+}
+
 #[async_trait]
 impl SessionPersistenceStore for JsonSessionPersistenceStore {
     async fn next_id(&self) -> anyhow::Result<TorrentId> {

crates/librqbit/src/session_persistence/mod.rs

@@ -13,7 +13,8 @@ use librqbit_core::Id20;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
 use crate::{
-    session::TorrentId, torrent_state::ManagedTorrentHandle, AddTorrent, AddTorrentOptions,
+    bitv_factory::BitVFactory, session::TorrentId, torrent_state::ManagedTorrentHandle, AddTorrent,
+    AddTorrentOptions,
 };
 
 #[derive(Serialize, Deserialize, Clone)]
@@ -63,7 +64,7 @@ impl SerializedTorrent {
 
 // TODO: make this info_hash first, ID-second.
 #[async_trait]
-pub trait SessionPersistenceStore: core::fmt::Debug + Send + Sync {
+pub trait SessionPersistenceStore: core::fmt::Debug + Send + Sync + BitVFactory {
     async fn next_id(&self) -> anyhow::Result<TorrentId>;
     async fn store(&self, id: TorrentId, torrent: &ManagedTorrentHandle) -> anyhow::Result<()>;
     async fn delete(&self, id: TorrentId) -> anyhow::Result<()>;

crates/librqbit/src/session_persistence/postgres.rs

@@ -1,10 +1,15 @@
 use std::path::PathBuf;
 
-use crate::{session::TorrentId, torrent_state::ManagedTorrentHandle};
+use crate::{
+    api::TorrentIdOrHash, bitv::BitV, bitv_factory::BitVFactory, session::TorrentId,
+    torrent_state::ManagedTorrentHandle,
+};
 use anyhow::Context;
+use bitvec::{order::Lsb0, vec::BitVec};
 use futures::{stream::BoxStream, StreamExt};
 use librqbit_core::Id20;
 use sqlx::{Pool, Postgres};
+use tracing::debug;
 
 use super::{SerializedTorrent, SessionPersistenceStore};
 
@@ -167,3 +172,19 @@ impl SessionPersistenceStore for PostgresSessionStorage {
         Ok(futures::stream::iter(torrents).boxed())
     }
 }
+
+#[async_trait::async_trait]
+impl BitVFactory for PostgresSessionStorage {
+    async fn load(&self, _: TorrentIdOrHash) -> anyhow::Result<Option<Box<dyn BitV>>> {
+        debug!("BitVFactory not implemented for PostgresSessionStorage: fastresume not available");
+        Ok(None)
+    }
+
+    async fn store_initial_check(
+        &self,
+        _: TorrentIdOrHash,
+        b: BitVec<u8, Lsb0>,
+    ) -> anyhow::Result<Box<dyn BitV>> {
+        Ok(b.into_dyn())
+    }
+}