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+3 -37

Cargo.toml

··· 1 1 [package] 2 2 name = "repo-stream" 3 3 - version = "0.1.1" 3 3 + version = "0.2.2" 4 4 edition = "2024" 5 5 license = "MIT OR Apache-2.0" 6 6 - description = "Fast and robust atproto CAR file processing in rust" 6 6 + description = "A robust CAR file -> MST walker for atproto" 7 7 repository = "https://tangled.org/@microcosm.blue/repo-stream" 8 8 9 9 [dependencies] 10 10 - bincode = { version = "2.0.1", features = ["serde"] } 11 11 - futures = "0.3.31" 12 12 - futures-core = "0.3.31" 13 13 - ipld-core = { version = "0.4.2", features = ["serde"] } 14 14 - iroh-car = "0.5.1" 15 15 - log = "0.4.28" 16 16 - multibase = "0.9.2" 17 17 - redb = "3.1.0" 18 18 - rusqlite = "0.37.0" 19 19 - serde = { version = "1.0.228", features = ["derive"] } 20 20 - serde_bytes = "0.11.19" 21 21 - serde_ipld_dagcbor = "0.6.4" 22 22 - thiserror = "2.0.17" 23 23 - tokio = { version = "1.47.1", features = ["rt"] } 24 24 - 25 25 - [dev-dependencies] 10 10 + fjall = "3.0.1" 26 11 clap = { version = "4.5.48", features = ["derive"] } 27 27 - criterion = { version = "0.7.0", features = ["async_tokio"] } 28 28 - env_logger = "0.11.8" 29 29 - multibase = "0.9.2" 30 30 - tempfile = "3.23.0" 31 31 - tokio = { version = "1.47.1", features = ["full"] } 32 32 - 33 33 - [profile.profiling] 34 34 - inherits = "release" 35 35 - debug = true 36 12 37 37 - [profile.release] 38 38 - debug = true 39 39 - 40 40 - [[bench]] 41 41 - name = "non-huge-cars" 42 42 - harness = false 43 43 - 44 44 - [[bench]] 45 45 - name = "huge-car" 46 46 - harness = false

+12 -21

benches/huge-car.rs

··· 1 1 extern crate repo_stream; 2 2 - use futures::TryStreamExt; 3 3 - use iroh_car::CarReader; 4 4 - use std::convert::Infallible; 2 2 + use repo_stream::Driver; 5 3 use std::path::{Path, PathBuf}; 6 4 7 5 use criterion::{Criterion, criterion_group, criterion_main}; ··· 20 18 }); 21 19 } 22 20 23 23 - async fn drive_car(filename: impl AsRef<Path>) { 21 21 + async fn drive_car(filename: impl AsRef<Path>) -> usize { 24 22 let reader = tokio::fs::File::open(filename).await.unwrap(); 25 23 let reader = tokio::io::BufReader::new(reader); 26 26 - let reader = CarReader::new(reader).await.unwrap(); 27 24 28 28 - let root = reader 29 29 - .header() 30 30 - .roots() 31 31 - .first() 32 32 - .ok_or("missing root") 25 25 + let mut driver = match Driver::load_car(reader, |block| block.len(), 1024) 26 26 + .await 33 27 .unwrap() 34 34 - .clone(); 35 35 - 36 36 - let stream = std::pin::pin!(reader.stream()); 37 37 - 38 38 - let (_commit, v) = 39 39 - repo_stream::drive::Vehicle::init(root, stream, |block| Ok::<_, Infallible>(block.len())) 40 40 - .await 41 41 - .unwrap(); 42 42 - let mut record_stream = std::pin::pin!(v.stream()); 28 28 + { 29 29 + Driver::Memory(_, mem_driver) => mem_driver, 30 30 + Driver::Disk(_) => panic!("not doing disk for benchmark"), 31 31 + }; 43 32 44 44 - while let Some(_) = record_stream.try_next().await.unwrap() { 45 45 - // just here for the drive 33 33 + let mut n = 0; 34 34 + while let Some(pairs) = driver.next_chunk(256).await.unwrap() { 35 35 + n += pairs.len(); 46 36 } 37 37 + n 47 38 } 48 39 49 40 criterion_group!(benches, criterion_benchmark);

+16 -22

benches/non-huge-cars.rs

··· 1 1 extern crate repo_stream; 2 2 - use futures::TryStreamExt; 3 3 - use iroh_car::CarReader; 4 4 - use std::convert::Infallible; 2 2 + use repo_stream::Driver; 5 3 6 4 use criterion::{Criterion, criterion_group, criterion_main}; 7 5 6 6 + const EMPTY_CAR: &'static [u8] = include_bytes!("../car-samples/empty.car"); 8 7 const TINY_CAR: &'static [u8] = include_bytes!("../car-samples/tiny.car"); 9 8 const LITTLE_CAR: &'static [u8] = include_bytes!("../car-samples/little.car"); 10 9 const MIDSIZE_CAR: &'static [u8] = include_bytes!("../car-samples/midsize.car"); ··· 15 14 .build() 16 15 .expect("Creating runtime failed"); 17 16 17 17 + c.bench_function("empty-car", |b| { 18 18 + b.to_async(&rt).iter(async || drive_car(EMPTY_CAR).await) 19 19 + }); 18 20 c.bench_function("tiny-car", |b| { 19 21 b.to_async(&rt).iter(async || drive_car(TINY_CAR).await) 20 22 }); ··· 26 28 }); 27 29 } 28 30 29 29 - async fn drive_car(bytes: &[u8]) { 30 30 - let reader = CarReader::new(bytes).await.unwrap(); 31 31 - 32 32 - let root = reader 33 33 - .header() 34 34 - .roots() 35 35 - .first() 36 36 - .ok_or("missing root") 31 31 + async fn drive_car(bytes: &[u8]) -> usize { 32 32 + let mut driver = match Driver::load_car(bytes, |block| block.len(), 32) 33 33 + .await 37 34 .unwrap() 38 38 - .clone(); 39 39 - 40 40 - let stream = std::pin::pin!(reader.stream()); 35 35 + { 36 36 + Driver::Memory(_, mem_driver) => mem_driver, 37 37 + Driver::Disk(_) => panic!("not benching big cars here"), 38 38 + }; 41 39 42 42 - let (_commit, v) = 43 43 - repo_stream::drive::Vehicle::init(root, stream, |block| Ok::<_, Infallible>(block.len())) 44 44 - .await 45 45 - .unwrap(); 46 46 - let mut record_stream = std::pin::pin!(v.stream()); 47 47 - 48 48 - while let Some(_) = record_stream.try_next().await.unwrap() { 49 49 - // just here for the drive 40 40 + let mut n = 0; 41 41 + while let Some(pairs) = driver.next_chunk(256).await.unwrap() { 42 42 + n += pairs.len(); 50 43 } 44 44 + n 51 45 } 52 46 53 47 criterion_group!(benches, criterion_benchmark);

car-samples/empty.car

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+27 -47

examples/disk-read-file/main.rs

··· 1 1 - extern crate repo_stream; 2 1 use clap::Parser; 3 3 - use repo_stream::drive::Processable; 4 4 - use serde::{Deserialize, Serialize}; 5 5 - use std::path::PathBuf; 6 6 - 7 7 - type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>; 2 2 + use fjall::{Database, KeyspaceCreateOptions}; 3 3 + use std::{path::PathBuf, collections::BTreeMap}; 8 4 9 5 #[derive(Debug, Parser)] 10 6 struct Args { 11 7 #[arg()] 12 12 - car: PathBuf, 13 13 - #[arg()] 14 14 - tmpfile: PathBuf, 8 8 + db_path: PathBuf, 15 9 } 16 10 17 17 - #[derive(Clone, Serialize, Deserialize)] 18 18 - struct S(usize); 11 11 + fn main() -> Result<(), Box<dyn std::error::Error>> { 12 12 + let Args { db_path } = Args::parse(); 19 13 20 20 - impl Processable for S { 21 21 - fn get_size(&self) -> usize { 22 22 - 0 // no additional space taken, just its stack size (newtype is free) 23 23 - } 24 24 - } 25 25 - 26 26 - #[tokio::main] 27 27 - async fn main() -> Result<()> { 28 28 - env_logger::init(); 14 14 + let db = Database::builder(db_path).open()?; 15 15 + let ks = db.keyspace("z", KeyspaceCreateOptions::default)?; 16 16 + let mut seen_keys: BTreeMap<Vec<u8>, usize> = BTreeMap::default(); 29 17 30 30 - let Args { car, tmpfile } = Args::parse(); 31 31 - let reader = tokio::fs::File::open(car).await?; 32 32 - let reader = tokio::io::BufReader::new(reader); 33 33 - 34 34 - // let kb = 2_usize.pow(10); 35 35 - let mb = 2_usize.pow(20); 18 18 + print!("writing..."); 19 19 + for i in 0..250_000_usize { 20 20 + let k = i.to_be_bytes().to_vec(); 21 21 + ks.insert(k.clone(), vec![0xAA; 256])?; 22 22 + seen_keys.insert(k, i); 23 23 + } 36 24 37 37 - let mut driver = 38 38 - match repo_stream::drive::load_car(reader, |block| S(block.len()), 16 * mb).await? { 39 39 - repo_stream::drive::Vehicle::Lil(_, _) => panic!("try this on a bigger car"), 40 40 - repo_stream::drive::Vehicle::Big(big_stuff) => { 41 41 - // let disk_store = repo_stream::disk::SqliteStore::new(tmpfile); 42 42 - let disk_store = repo_stream::disk::RedbStore::new(tmpfile); 43 43 - let (commit, driver) = big_stuff.finish_loading(disk_store).await?; 44 44 - log::warn!("big: {:?}", commit); 45 45 - driver 46 46 - } 47 47 - }; 25 25 + println!(" done. checking keys..."); 48 26 49 49 - println!("hello!"); 27 27 + // remove every seen key that fjall actually has, to see what's left 28 28 + for guard in ks.iter() { 29 29 + seen_keys.remove(guard.key()?.as_ref()); 30 30 + } 50 31 51 51 - let mut n = 0; 52 52 - loop { 53 53 - let (d, Some(pairs)) = driver.next_chunk(256).await? else { 54 54 - break; 55 55 - }; 56 56 - driver = d; 57 57 - n += pairs.len(); 58 58 - // log::info!("got {rkey:?}"); 32 32 + // report the result 33 33 + if seen_keys.len() == 0 { 34 34 + println!("[ OK ] all keys found"); 35 35 + } else { 36 36 + println!("[FAIL] fjall did not have all seen_keys:"); 37 37 + for (k, i) in seen_keys { 38 38 + println!(" insert #{i} missing, key bytes: {k:?}"); 39 39 + } 59 40 } 60 60 - log::info!("bye! {n}"); 61 41 62 42 Ok(()) 63 43 }

+14 -6

examples/read-file/main.rs

··· 1 1 + /*! 2 2 + Read a CAR file with in-memory processing 3 3 + */ 4 4 + 1 5 extern crate repo_stream; 2 6 use clap::Parser; 7 7 + use repo_stream::{Driver, DriverBuilder}; 3 8 use std::path::PathBuf; 4 9 5 10 type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>; ··· 18 23 let reader = tokio::fs::File::open(file).await?; 19 24 let reader = tokio::io::BufReader::new(reader); 20 25 21 21 - let (commit, mut driver) = 22 22 - match repo_stream::drive::load_car(reader, |block| block.len(), 1024 * 1024).await? { 23 23 - repo_stream::drive::Vehicle::Lil(commit, mem_driver) => (commit, mem_driver), 24 24 - repo_stream::drive::Vehicle::Big(_) => panic!("can't handle big cars yet"), 25 25 - }; 26 26 + let (commit, mut driver) = match DriverBuilder::new() 27 27 + .with_block_processor(|block| block.len()) 28 28 + .load_car(reader) 29 29 + .await? 30 30 + { 31 31 + Driver::Memory(commit, mem_driver) => (commit, mem_driver), 32 32 + Driver::Disk(_) => panic!("this example doesn't handle big CARs"), 33 33 + }; 26 34 27 35 log::info!("got commit: {commit:?}"); 28 36 ··· 31 39 n += pairs.len(); 32 40 // log::info!("got {rkey:?}"); 33 41 } 34 34 - log::info!("bye! {n}"); 42 42 + log::info!("bye! total records={n}"); 35 43 36 44 Ok(()) 37 45 }

+70 -2

readme.md

··· 1 1 # repo-stream 2 2 3 3 - Fast and (aspirationally) robust atproto CAR file processing in rust 3 3 + A robust CAR file -> MST walker for atproto 4 4 + 5 5 + [![Crates.io][crates-badge]](https://crates.io/crates/repo-stream) 6 6 + [![Documentation][docs-badge]](https://docs.rs/repo-stream) 7 7 + [![Sponsor][sponsor-badge]](https://github.com/sponsors/uniphil) 8 8 + 9 9 + [crates-badge]: https://img.shields.io/crates/v/repo-stream.svg 10 10 + [docs-badge]: https://docs.rs/repo-stream/badge.svg 11 11 + [sponsor-badge]: https://img.shields.io/badge/at-microcosm-b820f9?labelColor=b820f9&logo=githubsponsors&logoColor=fff 12 12 + 13 13 + ```rust 14 14 + use repo_stream::{Driver, DriverBuilder, DriveError, DiskBuilder}; 15 15 + 16 16 + #[tokio::main] 17 17 + async fn main() -> Result<(), DriveError> { 18 18 + // repo-stream takes any AsyncRead as input, like a tokio::fs::File 19 19 + let reader = tokio::fs::File::open("repo.car".into()).await?; 20 20 + let reader = tokio::io::BufReader::new(reader); 21 21 + 22 22 + // example repo workload is simply counting the total record bytes 23 23 + let mut total_size = 0; 24 24 + 25 25 + match DriverBuilder::new() 26 26 + .with_mem_limit_mb(10) 27 27 + .with_block_processor(|rec| rec.len()) // block processing: just extract the raw record size 28 28 + .load_car(reader) 29 29 + .await? 30 30 + { 31 31 + 32 32 + // if all blocks fit within memory 33 33 + Driver::Memory(_commit, mut driver) => { 34 34 + while let Some(chunk) = driver.next_chunk(256).await? { 35 35 + for (_rkey, size) in chunk { 36 36 + total_size += size; 37 37 + } 38 38 + } 39 39 + }, 40 40 + 41 41 + // if the CAR was too big for in-memory processing 42 42 + Driver::Disk(paused) => { 43 43 + // set up a disk store we can spill to 44 44 + let store = DiskBuilder::new().open("some/path.db".into()).await?; 45 45 + // do the spilling, get back a (similar) driver 46 46 + let (_commit, mut driver) = paused.finish_loading(store).await?; 47 47 + 48 48 + while let Some(chunk) = driver.next_chunk(256).await? { 49 49 + for (_rkey, size) in chunk { 50 50 + total_size += size; 51 51 + } 52 52 + } 53 53 + 54 54 + // clean up the disk store (drop tables etc) 55 55 + driver.reset_store().await?; 56 56 + } 57 57 + }; 58 58 + println!("sum of size of all records: {total_size}"); 59 59 + Ok(()) 60 60 + } 61 61 + ``` 62 62 + 63 63 + more recent todo 64 64 + 65 65 + - [ ] get an *emtpy* car for the test suite 66 66 + - [x] implement a max size on disk limit 67 67 + 68 68 + 69 69 + ----- 70 70 + 71 71 + older stuff (to clean up): 4 72 5 73 6 74 current car processing times (records processed into their length usize, phil's dev machine): ··· 27 95 -> yeah the commit is returned from init 28 96 - [ ] spec compliance todos 29 97 - [x] assert that keys are ordered and fail if not 30 30 - - [ ] verify node mst depth from key (possibly pending [interop test fixes](https://github.com/bluesky-social/atproto-interop-tests/issues/5)) 98 98 + - [x] verify node mst depth from key (possibly pending [interop test fixes](https://github.com/bluesky-social/atproto-interop-tests/issues/5)) 31 99 - [ ] performance todos 32 100 - [x] consume the serialized nodes into a mutable efficient format 33 101 - [ ] maybe customize the deserialize impl to do that directly?

-211

src/disk.rs

··· 1 1 - use redb::ReadableDatabase; 2 2 - use rusqlite::OptionalExtension; 3 3 - use std::error::Error; 4 4 - use std::path::PathBuf; 5 5 - 6 6 - pub trait StorageErrorBase: Error + Send + 'static {} 7 7 - 8 8 - /// high level potential storage resource 9 9 - /// 10 10 - /// separating this allows (hopefully) implementing a storage pool that can 11 11 - /// async-block when until a member is available to use 12 12 - pub trait DiskStore { 13 13 - type StorageError: StorageErrorBase + Send; 14 14 - type Access: DiskAccess<StorageError = Self::StorageError>; 15 15 - fn get_access(&mut self) -> impl Future<Output = Result<Self::Access, Self::StorageError>>; 16 16 - } 17 17 - 18 18 - /// actual concrete access to disk storage 19 19 - pub trait DiskAccess: Send { 20 20 - type StorageError: StorageErrorBase; 21 21 - 22 22 - fn get_writer(&mut self) -> Result<impl DiskWriter<Self::StorageError>, Self::StorageError>; 23 23 - 24 24 - fn get_reader( 25 25 - &self, 26 26 - ) -> Result<impl DiskReader<StorageError = Self::StorageError>, Self::StorageError>; 27 27 - 28 28 - // TODO: force a cleanup implementation? 29 29 - } 30 30 - 31 31 - pub trait DiskWriter<E: StorageErrorBase> { 32 32 - fn put(&mut self, key: Vec<u8>, val: Vec<u8>) -> Result<(), E>; 33 33 - } 34 34 - 35 35 - pub trait DiskReader { 36 36 - type StorageError: StorageErrorBase; 37 37 - fn get(&mut self, key: Vec<u8>) -> Result<Option<Vec<u8>>, Self::StorageError>; 38 38 - } 39 39 - 40 40 - ///////////////// sqlite 41 41 - 42 42 - pub struct SqliteStore { 43 43 - path: PathBuf, 44 44 - } 45 45 - 46 46 - impl SqliteStore { 47 47 - pub fn new(path: PathBuf) -> Self { 48 48 - Self { path } 49 49 - } 50 50 - } 51 51 - 52 52 - impl StorageErrorBase for rusqlite::Error {} 53 53 - 54 54 - impl DiskStore for SqliteStore { 55 55 - type StorageError = rusqlite::Error; 56 56 - type Access = SqliteAccess; 57 57 - async fn get_access(&mut self) -> Result<SqliteAccess, rusqlite::Error> { 58 58 - let path = self.path.clone(); 59 59 - let conn = tokio::task::spawn_blocking(move || { 60 60 - let conn = rusqlite::Connection::open(path)?; 61 61 - 62 62 - conn.pragma_update(None, "journal_mode", "WAL")?; 63 63 - conn.pragma_update(None, "synchronous", "OFF")?; 64 64 - conn.pragma_update(None, "cache_size", (-4 * 2_i64.pow(10)).to_string())?; 65 65 - conn.execute( 66 66 - "CREATE TABLE blocks ( 67 67 - key BLOB PRIMARY KEY NOT NULL, 68 68 - val BLOB NOT NULL 69 69 - ) WITHOUT ROWID", 70 70 - (), 71 71 - )?; 72 72 - 73 73 - Ok::<_, Self::StorageError>(conn) 74 74 - }) 75 75 - .await 76 76 - .expect("join error")?; 77 77 - 78 78 - Ok(SqliteAccess { conn }) 79 79 - } 80 80 - } 81 81 - 82 82 - pub struct SqliteAccess { 83 83 - conn: rusqlite::Connection, 84 84 - } 85 85 - 86 86 - impl DiskAccess for SqliteAccess { 87 87 - type StorageError = rusqlite::Error; 88 88 - fn get_writer(&mut self) -> Result<impl DiskWriter<rusqlite::Error>, rusqlite::Error> { 89 89 - let insert_stmt = self 90 90 - .conn 91 91 - .prepare("INSERT INTO blocks (key, val) VALUES (?1, ?2)")?; 92 92 - Ok(SqliteWriter { insert_stmt }) 93 93 - } 94 94 - fn get_reader( 95 95 - &self, 96 96 - ) -> Result<impl DiskReader<StorageError = rusqlite::Error>, rusqlite::Error> { 97 97 - let select_stmt = self.conn.prepare("SELECT val FROM blocks WHERE key = ?1")?; 98 98 - Ok(SqliteReader { select_stmt }) 99 99 - } 100 100 - } 101 101 - 102 102 - pub struct SqliteWriter<'conn> { 103 103 - insert_stmt: rusqlite::Statement<'conn>, 104 104 - } 105 105 - 106 106 - impl DiskWriter<rusqlite::Error> for SqliteWriter<'_> { 107 107 - fn put(&mut self, key: Vec<u8>, val: Vec<u8>) -> rusqlite::Result<()> { 108 108 - self.insert_stmt.execute((key, val))?; 109 109 - Ok(()) 110 110 - } 111 111 - } 112 112 - 113 113 - pub struct SqliteReader<'conn> { 114 114 - select_stmt: rusqlite::Statement<'conn>, 115 115 - } 116 116 - 117 117 - impl DiskReader for SqliteReader<'_> { 118 118 - type StorageError = rusqlite::Error; 119 119 - fn get(&mut self, key: Vec<u8>) -> rusqlite::Result<Option<Vec<u8>>> { 120 120 - self.select_stmt 121 121 - .query_one((&key,), |row| row.get(0)) 122 122 - .optional() 123 123 - } 124 124 - } 125 125 - 126 126 - //////////// redb why not 127 127 - 128 128 - const REDB_TABLE: redb::TableDefinition<&[u8], &[u8]> = redb::TableDefinition::new("blocks"); 129 129 - 130 130 - pub struct RedbStore { 131 131 - path: PathBuf, 132 132 - } 133 133 - 134 134 - impl RedbStore { 135 135 - pub fn new(path: PathBuf) -> Self { 136 136 - Self { path } 137 137 - } 138 138 - } 139 139 - 140 140 - impl StorageErrorBase for redb::Error {} 141 141 - 142 142 - impl DiskStore for RedbStore { 143 143 - type StorageError = redb::Error; 144 144 - type Access = RedbAccess; 145 145 - async fn get_access(&mut self) -> Result<RedbAccess, redb::Error> { 146 146 - let path = self.path.clone(); 147 147 - let kb = 2_usize.pow(10); 148 148 - let db = tokio::task::spawn_blocking(move || { 149 149 - let db = redb::Database::builder() 150 150 - .set_cache_size(16 * kb) 151 151 - .create(path)?; 152 152 - Ok::<_, Self::StorageError>(db) 153 153 - }) 154 154 - .await 155 155 - .expect("join error")?; 156 156 - 157 157 - Ok(RedbAccess { db }) 158 158 - } 159 159 - } 160 160 - 161 161 - pub struct RedbAccess { 162 162 - db: redb::Database, 163 163 - } 164 164 - 165 165 - impl DiskAccess for RedbAccess { 166 166 - type StorageError = redb::Error; 167 167 - fn get_writer(&mut self) -> Result<impl DiskWriter<redb::Error>, redb::Error> { 168 168 - let mut tx = self.db.begin_write()?; 169 169 - tx.set_durability(redb::Durability::None)?; 170 170 - Ok(RedbWriter { tx: Some(tx) }) 171 171 - } 172 172 - fn get_reader(&self) -> Result<impl DiskReader<StorageError = redb::Error>, redb::Error> { 173 173 - let tx = self.db.begin_read()?; 174 174 - Ok(RedbReader { tx }) 175 175 - } 176 176 - } 177 177 - 178 178 - pub struct RedbWriter { 179 179 - tx: Option<redb::WriteTransaction>, 180 180 - } 181 181 - 182 182 - impl DiskWriter<redb::Error> for RedbWriter { 183 183 - fn put(&mut self, key: Vec<u8>, val: Vec<u8>) -> Result<(), redb::Error> { 184 184 - let mut table = self.tx.as_ref().unwrap().open_table(REDB_TABLE)?; 185 185 - table.insert(&*key, &*val)?; 186 186 - Ok(()) 187 187 - } 188 188 - } 189 189 - 190 190 - /// oops careful in async 191 191 - impl Drop for RedbWriter { 192 192 - fn drop(&mut self) { 193 193 - let tx = self.tx.take(); 194 194 - tx.unwrap().commit().unwrap(); 195 195 - } 196 196 - } 197 197 - 198 198 - pub struct RedbReader { 199 199 - tx: redb::ReadTransaction, 200 200 - } 201 201 - 202 202 - impl DiskReader for RedbReader { 203 203 - type StorageError = redb::Error; 204 204 - fn get(&mut self, key: Vec<u8>) -> Result<Option<Vec<u8>>, redb::Error> { 205 205 - let table = self.tx.open_table(REDB_TABLE)?; 206 206 - let rv = table.get(&*key)?.map(|guard| guard.value().to_vec()); 207 207 - Ok(rv) 208 208 - } 209 209 - } 210 210 - 211 211 - ///// TODO: that other single file db thing to try

-377

src/drive.rs

··· 1 1 - //! Consume an MST block stream, producing an ordered stream of records 2 2 - 3 3 - use crate::disk::{DiskAccess, DiskStore, DiskWriter, StorageErrorBase}; 4 4 - use ipld_core::cid::Cid; 5 5 - use iroh_car::CarReader; 6 6 - use serde::de::DeserializeOwned; 7 7 - use serde::{Deserialize, Serialize}; 8 8 - use std::collections::HashMap; 9 9 - use std::convert::Infallible; 10 10 - use tokio::io::AsyncRead; 11 11 - 12 12 - use crate::mst::{Commit, Node}; 13 13 - use crate::walk::{DiskTrip, Step, Trip, Walker}; 14 14 - 15 15 - /// Errors that can happen while consuming and emitting blocks and records 16 16 - #[derive(Debug, thiserror::Error)] 17 17 - pub enum DriveError { 18 18 - #[error("Error from iroh_car: {0}")] 19 19 - CarReader(#[from] iroh_car::Error), 20 20 - #[error("Failed to decode commit block: {0}")] 21 21 - BadBlock(#[from] serde_ipld_dagcbor::DecodeError<Infallible>), 22 22 - #[error("The Commit block reference by the root was not found")] 23 23 - MissingCommit, 24 24 - #[error("The MST block {0} could not be found")] 25 25 - MissingBlock(Cid), 26 26 - #[error("Failed to walk the mst tree: {0}")] 27 27 - Tripped(#[from] Trip), 28 28 - #[error("CAR file had no roots")] 29 29 - MissingRoot, 30 30 - } 31 31 - 32 32 - #[derive(Debug, thiserror::Error)] 33 33 - pub enum DiskDriveError<E: StorageErrorBase> { 34 34 - #[error("Error from iroh_car: {0}")] 35 35 - CarReader(#[from] iroh_car::Error), 36 36 - #[error("Failed to decode commit block: {0}")] 37 37 - BadBlock(#[from] serde_ipld_dagcbor::DecodeError<Infallible>), 38 38 - #[error("Storage error")] 39 39 - StorageError(#[from] E), 40 40 - #[error("The Commit block reference by the root was not found")] 41 41 - MissingCommit, 42 42 - #[error("The MST block {0} could not be found")] 43 43 - MissingBlock(Cid), 44 44 - #[error("Encode error: {0}")] 45 45 - BincodeEncodeError(#[from] bincode::error::EncodeError), 46 46 - #[error("Decode error: {0}")] 47 47 - BincodeDecodeError(#[from] bincode::error::DecodeError), 48 48 - #[error("disk tripped: {0}")] 49 49 - DiskTripped(#[from] DiskTrip<E>), 50 50 - } 51 51 - 52 52 - // #[derive(Debug, thiserror::Error)] 53 53 - // pub enum Boooooo<E: StorageErrorBase> { 54 54 - // #[error("disk tripped: {0}")] 55 55 - // DiskTripped(#[from] DiskTrip<E>), 56 56 - // #[error("dde whatever: {0}")] 57 57 - // DiskDriveError(#[from] DiskDriveError<E>), 58 58 - // } 59 59 - 60 60 - pub trait Processable: Clone + Serialize + DeserializeOwned { 61 61 - /// the additional size taken up (not including its mem::size_of) 62 62 - fn get_size(&self) -> usize; 63 63 - } 64 64 - 65 65 - #[derive(Debug, Clone, Serialize, Deserialize)] 66 66 - pub enum MaybeProcessedBlock<T> { 67 67 - /// A block that's *probably* a Node (but we can't know yet) 68 68 - /// 69 69 - /// It *can be* a record that suspiciously looks a lot like a node, so we 70 70 - /// cannot eagerly turn it into a Node. We only know for sure what it is 71 71 - /// when we actually walk down the MST 72 72 - Raw(Vec<u8>), 73 73 - /// A processed record from a block that was definitely not a Node 74 74 - /// 75 75 - /// Processing has to be fallible because the CAR can have totally-unused 76 76 - /// blocks, which can just be garbage. since we're eagerly trying to process 77 77 - /// record blocks without knowing for sure that they *are* records, we 78 78 - /// discard any definitely-not-nodes that fail processing and keep their 79 79 - /// error in the buffer for them. if we later try to retreive them as a 80 80 - /// record, then we can surface the error. 81 81 - /// 82 82 - /// If we _never_ needed this block, then we may have wasted a bit of effort 83 83 - /// trying to process it. Oh well. 84 84 - /// 85 85 - /// There's an alternative here, which would be to kick unprocessable blocks 86 86 - /// back to Raw, or maybe even a new RawUnprocessable variant. Then we could 87 87 - /// surface the typed error later if needed by trying to reprocess. 88 88 - Processed(T), 89 89 - } 90 90 - 91 91 - impl<T: Processable> Processable for MaybeProcessedBlock<T> { 92 92 - /// TODO this is probably a little broken 93 93 - fn get_size(&self) -> usize { 94 94 - use std::{cmp::max, mem::size_of}; 95 95 - 96 96 - // enum is always as big as its biggest member? 97 97 - let base_size = max(size_of::<Vec<u8>>(), size_of::<T>()); 98 98 - 99 99 - let extra = match self { 100 100 - Self::Raw(bytes) => bytes.len(), 101 101 - Self::Processed(t) => t.get_size(), 102 102 - }; 103 103 - 104 104 - base_size + extra 105 105 - } 106 106 - } 107 107 - 108 108 - pub enum Vehicle<R: AsyncRead + Unpin, T: Processable> { 109 109 - Lil(Commit, MemDriver<T>), 110 110 - Big(BigCar<R, T>), 111 111 - } 112 112 - 113 113 - pub async fn load_car<R: AsyncRead + Unpin, T: Processable>( 114 114 - reader: R, 115 115 - process: fn(Vec<u8>) -> T, 116 116 - max_size: usize, 117 117 - ) -> Result<Vehicle<R, T>, DriveError> { 118 118 - let mut mem_blocks = HashMap::new(); 119 119 - 120 120 - let mut car = CarReader::new(reader).await?; 121 121 - 122 122 - let root = *car 123 123 - .header() 124 124 - .roots() 125 125 - .first() 126 126 - .ok_or(DriveError::MissingRoot)?; 127 127 - log::debug!("root: {root:?}"); 128 128 - 129 129 - let mut commit = None; 130 130 - 131 131 - // try to load all the blocks into memory 132 132 - let mut mem_size = 0; 133 133 - while let Some((cid, data)) = car.next_block().await? { 134 134 - // the root commit is a Special Third Kind of block that we need to make 135 135 - // sure not to optimistically send to the processing function 136 136 - if cid == root { 137 137 - let c: Commit = serde_ipld_dagcbor::from_slice(&data)?; 138 138 - commit = Some(c); 139 139 - continue; 140 140 - } 141 141 - 142 142 - // remaining possible types: node, record, other. optimistically process 143 143 - // TODO: get the actual in-memory size to compute disk spill 144 144 - let maybe_processed = if Node::could_be(&data) { 145 145 - MaybeProcessedBlock::Raw(data) 146 146 - } else { 147 147 - MaybeProcessedBlock::Processed(process(data)) 148 148 - }; 149 149 - 150 150 - // stash (maybe processed) blocks in memory as long as we have room 151 151 - mem_size += std::mem::size_of::<Cid>() + maybe_processed.get_size(); 152 152 - mem_blocks.insert(cid, maybe_processed); 153 153 - if mem_size >= max_size { 154 154 - return Ok(Vehicle::Big(BigCar { 155 155 - car, 156 156 - root, 157 157 - process, 158 158 - max_size, 159 159 - mem_blocks, 160 160 - commit, 161 161 - })); 162 162 - } 163 163 - } 164 164 - 165 165 - // all blocks loaded and we fit in memory! hopefully we found the commit... 166 166 - let commit = commit.ok_or(DriveError::MissingCommit)?; 167 167 - 168 168 - let walker = Walker::new(commit.data); 169 169 - 170 170 - Ok(Vehicle::Lil( 171 171 - commit, 172 172 - MemDriver { 173 173 - blocks: mem_blocks, 174 174 - walker, 175 175 - process, 176 176 - }, 177 177 - )) 178 178 - } 179 179 - 180 180 - /// a paritally memory-loaded car file that needs disk spillover to continue 181 181 - pub struct BigCar<R: AsyncRead + Unpin, T: Processable> { 182 182 - car: CarReader<R>, 183 183 - root: Cid, 184 184 - process: fn(Vec<u8>) -> T, 185 185 - max_size: usize, 186 186 - mem_blocks: HashMap<Cid, MaybeProcessedBlock<T>>, 187 187 - pub commit: Option<Commit>, 188 188 - } 189 189 - 190 190 - fn encode(v: impl Serialize) -> Result<Vec<u8>, bincode::error::EncodeError> { 191 191 - bincode::serde::encode_to_vec(v, bincode::config::standard()) 192 192 - } 193 193 - 194 194 - pub fn decode<T: Processable>(bytes: &[u8]) -> Result<T, bincode::error::DecodeError> { 195 195 - let (t, n) = bincode::serde::decode_from_slice(bytes, bincode::config::standard())?; 196 196 - assert_eq!(n, bytes.len(), "expected to decode all bytes"); // TODO 197 197 - Ok(t) 198 198 - } 199 199 - 200 200 - impl<R: AsyncRead + Unpin, T: Processable + Send + 'static> BigCar<R, T> { 201 201 - pub async fn finish_loading<S: DiskStore>( 202 202 - mut self, 203 203 - mut store: S, 204 204 - ) -> Result<(Commit, BigCarReady<T, S::Access>), DiskDriveError<S::StorageError>> 205 205 - where 206 206 - S::Access: Send + 'static, 207 207 - S::StorageError: 'static, 208 208 - { 209 209 - // set up access for real 210 210 - let mut access = store.get_access().await?; 211 211 - 212 212 - // move access in and back out so we can manage lifetimes 213 213 - // dump mem blocks into the store 214 214 - access = tokio::task::spawn(async move { 215 215 - let mut writer = access.get_writer()?; 216 216 - for (k, v) in self.mem_blocks { 217 217 - let key_bytes = k.to_bytes(); 218 218 - let val_bytes = encode(v)?; // TODO 219 219 - writer.put(key_bytes, val_bytes)?; 220 220 - } 221 221 - drop(writer); // cannot outlive access 222 222 - Ok::<_, DiskDriveError<S::StorageError>>(access) 223 223 - }) 224 224 - .await 225 225 - .unwrap()?; 226 226 - 227 227 - // dump the rest to disk (in chunks) 228 228 - loop { 229 229 - let mut chunk = vec![]; 230 230 - let mut mem_size = 0; 231 231 - loop { 232 232 - let Some((cid, data)) = self.car.next_block().await? else { 233 233 - break; 234 234 - }; 235 235 - // we still gotta keep checking for the root since we might not have it 236 236 - if cid == self.root { 237 237 - let c: Commit = serde_ipld_dagcbor::from_slice(&data)?; 238 238 - self.commit = Some(c); 239 239 - continue; 240 240 - } 241 241 - // remaining possible types: node, record, other. optimistically process 242 242 - // TODO: get the actual in-memory size to compute disk spill 243 243 - let maybe_processed = if Node::could_be(&data) { 244 244 - MaybeProcessedBlock::Raw(data) 245 245 - } else { 246 246 - MaybeProcessedBlock::Processed((self.process)(data)) 247 247 - }; 248 248 - mem_size += std::mem::size_of::<Cid>() + maybe_processed.get_size(); 249 249 - chunk.push((cid, maybe_processed)); 250 250 - if mem_size >= self.max_size { 251 251 - break; 252 252 - } 253 253 - } 254 254 - if chunk.is_empty() { 255 255 - break; 256 256 - } 257 257 - 258 258 - // move access in and back out so we can manage lifetimes 259 259 - // dump mem blocks into the store 260 260 - access = tokio::task::spawn_blocking(move || { 261 261 - let mut writer = access.get_writer()?; 262 262 - for (k, v) in chunk { 263 263 - let key_bytes = k.to_bytes(); 264 264 - let val_bytes = encode(v)?; // TODO 265 265 - writer.put(key_bytes, val_bytes)?; 266 266 - } 267 267 - drop(writer); // cannot outlive access 268 268 - Ok::<_, DiskDriveError<S::StorageError>>(access) 269 269 - }) 270 270 - .await 271 271 - .unwrap()?; // TODO 272 272 - } 273 273 - 274 274 - let commit = self.commit.ok_or(DiskDriveError::MissingCommit)?; 275 275 - 276 276 - let walker = Walker::new(commit.data); 277 277 - 278 278 - Ok(( 279 279 - commit, 280 280 - BigCarReady { 281 281 - process: self.process, 282 282 - access, 283 283 - walker, 284 284 - }, 285 285 - )) 286 286 - } 287 287 - } 288 288 - 289 289 - pub struct BigCarReady<T: Clone, A: DiskAccess> { 290 290 - process: fn(Vec<u8>) -> T, 291 291 - access: A, 292 292 - walker: Walker, 293 293 - } 294 294 - 295 295 - impl<T: Processable + Send + 'static, A: DiskAccess + Send + 'static> BigCarReady<T, A> { 296 296 - pub async fn next_chunk( 297 297 - mut self, 298 298 - n: usize, 299 299 - ) -> Result<(Self, Option<Vec<(String, T)>>), DiskDriveError<A::StorageError>> 300 300 - where 301 301 - A::StorageError: Send, 302 302 - { 303 303 - let mut out = Vec::with_capacity(n); 304 304 - (self, out) = tokio::task::spawn_blocking(move || { 305 305 - let access = self.access; 306 306 - let mut reader = access.get_reader()?; 307 307 - 308 308 - for _ in 0..n { 309 309 - // walk as far as we can until we run out of blocks or find a record 310 310 - match self.walker.disk_step(&mut reader, self.process)? { 311 311 - Step::Missing(cid) => return Err(DiskDriveError::MissingBlock(cid)), 312 312 - Step::Finish => break, 313 313 - Step::Step { rkey, data } => { 314 314 - out.push((rkey, data)); 315 315 - continue; 316 316 - } 317 317 - }; 318 318 - } 319 319 - 320 320 - drop(reader); // cannot outlive access 321 321 - self.access = access; 322 322 - Ok::<_, DiskDriveError<A::StorageError>>((self, out)) 323 323 - }) 324 324 - .await 325 325 - .unwrap()?; // TODO 326 326 - 327 327 - if out.is_empty() { 328 328 - Ok((self, None)) 329 329 - } else { 330 330 - Ok((self, Some(out))) 331 331 - } 332 332 - } 333 333 - } 334 334 - 335 335 - /// The core driver between the block stream and MST walker 336 336 - /// 337 337 - /// In the future, PDSs will export CARs in a stream-friendly order that will 338 338 - /// enable processing them with tiny memory overhead. But that future is not 339 339 - /// here yet. 340 340 - /// 341 341 - /// CARs are almost always in a stream-unfriendly order, so I'm reverting the 342 342 - /// optimistic stream features: we load all block first, then walk the MST. 343 343 - /// 344 344 - /// This makes things much simpler: we only need to worry about spilling to disk 345 345 - /// in one place, and we always have a reasonable expecatation about how much 346 346 - /// work the init function will do. We can drop the CAR reader before walking, 347 347 - /// so the sync/async boundaries become a little easier to work around. 348 348 - #[derive(Debug)] 349 349 - pub struct MemDriver<T: Processable> { 350 350 - blocks: HashMap<Cid, MaybeProcessedBlock<T>>, 351 351 - walker: Walker, 352 352 - process: fn(Vec<u8>) -> T, 353 353 - } 354 354 - 355 355 - impl<T: Processable> MemDriver<T> { 356 356 - /// Manually step through the record outputs 357 357 - pub async fn next_chunk(&mut self, n: usize) -> Result<Option<Vec<(String, T)>>, DriveError> { 358 358 - let mut out = Vec::with_capacity(n); 359 359 - for _ in 0..n { 360 360 - // walk as far as we can until we run out of blocks or find a record 361 361 - match self.walker.step(&mut self.blocks, self.process)? { 362 362 - Step::Missing(cid) => return Err(DriveError::MissingBlock(cid)), 363 363 - Step::Finish => break, 364 364 - Step::Step { rkey, data } => { 365 365 - out.push((rkey, data)); 366 366 - continue; 367 367 - } 368 368 - }; 369 369 - } 370 370 - 371 371 - if out.is_empty() { 372 372 - Ok(None) 373 373 - } else { 374 374 - Ok(Some(out)) 375 375 - } 376 376 - } 377 377 - }

+74 -7

src/lib.rs

··· 1 1 - //! Fast and robust atproto CAR file processing in rust 2 2 - //! 3 3 - //! For now see the [examples](https://tangled.org/@microcosm.blue/repo-stream/tree/main/examples) 1 1 + /*! 2 2 + A robust CAR file -> MST walker for atproto 3 3 + 4 4 + Small CARs have their blocks buffered in memory. If a configurable memory limit 5 5 + is reached while reading blocks, CAR reading is suspended, and can be continued 6 6 + by providing disk storage to buffer the CAR blocks instead. 7 7 + 8 8 + A `process` function can be provided for tasks where records are transformed 9 9 + into a smaller representation, to save memory (and disk) during block reading. 10 10 + 11 11 + Once blocks are loaded, the MST is walked and emitted as chunks of pairs of 12 12 + `(rkey, processed_block)` pairs, in order (depth first, left-to-right). 13 13 + 14 14 + Some MST validations are applied 15 15 + - Keys must appear in order 16 16 + - Keys must be at the correct MST tree depth 17 17 + 18 18 + `iroh_car` additionally applies a block size limit of `2MiB`. 19 19 + 20 20 + ``` 21 21 + use repo_stream::{Driver, DriverBuilder, DiskBuilder}; 22 22 + 23 23 + # #[tokio::main] 24 24 + # async fn main() -> Result<(), Box<dyn std::error::Error>> { 25 25 + # let reader = include_bytes!("../car-samples/tiny.car").as_slice(); 26 26 + let mut total_size = 0; 27 27 + 28 28 + match DriverBuilder::new() 29 29 + .with_mem_limit_mb(10) 30 30 + .with_block_processor(|rec| rec.len()) // block processing: just extract the raw record size 31 31 + .load_car(reader) 32 32 + .await? 33 33 + { 34 34 + 35 35 + // if all blocks fit within memory 36 36 + Driver::Memory(_commit, mut driver) => { 37 37 + while let Some(chunk) = driver.next_chunk(256).await? { 38 38 + for (_rkey, size) in chunk { 39 39 + total_size += size; 40 40 + } 41 41 + } 42 42 + }, 4 43 5 5 - pub mod disk; 6 6 - pub mod drive; 7 7 - pub mod mst; 8 8 - pub mod walk; 44 44 + // if the CAR was too big for in-memory processing 45 45 + Driver::Disk(paused) => { 46 46 + // set up a disk store we can spill to 47 47 + let store = DiskBuilder::new().open("some/path.db".into()).await?; 48 48 + // do the spilling, get back a (similar) driver 49 49 + let (_commit, mut driver) = paused.finish_loading(store).await?; 50 50 + 51 51 + while let Some(chunk) = driver.next_chunk(256).await? { 52 52 + for (_rkey, size) in chunk { 53 53 + total_size += size; 54 54 + } 55 55 + } 56 56 + 57 57 + // clean up the disk store (drop tables etc) 58 58 + driver.reset_store().await?; 59 59 + } 60 60 + }; 61 61 + println!("sum of size of all records: {total_size}"); 62 62 + # Ok(()) 63 63 + # } 64 64 + ``` 65 65 + 66 66 + Disk spilling suspends and returns a `Driver::Disk(paused)` instead of going 67 67 + ahead and eagerly using disk I/O. This means you have to write a bit more code 68 68 + to handle both cases, but it allows you to have finer control over resource 69 69 + usage. For example, you can drive a number of parallel memory CAR workers, and 70 70 + separately have a different number of disk workers picking up suspended disk 71 71 + tasks from a queue. 72 72 + 73 73 + Find more [examples in the repo](https://tangled.org/@microcosm.blue/repo-stream/tree/main/examples). 74 74 + 75 75 + */

-114

src/mst.rs

··· 1 1 - //! Low-level types for parsing raw atproto MST CARs 2 2 - //! 3 3 - //! The primary aim is to work through the **tree** structure. Non-node blocks 4 4 - //! are left as raw bytes, for upper levels to parse into DAG-CBOR or whatever. 5 5 - 6 6 - use ipld_core::cid::Cid; 7 7 - use serde::Deserialize; 8 8 - 9 9 - /// The top-level data object in a repository's tree is a signed commit. 10 10 - #[derive(Debug, Deserialize)] 11 11 - // #[serde(deny_unknown_fields)] 12 12 - pub struct Commit { 13 13 - /// the account DID associated with the repo, in strictly normalized form 14 14 - /// (eg, lowercase as appropriate) 15 15 - pub did: String, 16 16 - /// fixed value of 3 for this repo format version 17 17 - pub version: u64, 18 18 - /// pointer to the top of the repo contents tree structure (MST) 19 19 - pub data: Cid, 20 20 - /// revision of the repo, used as a logical clock. 21 21 - /// 22 22 - /// TID format. Must increase monotonically. Recommend using current 23 23 - /// timestamp as TID; rev values in the "future" (beyond a fudge factor) 24 24 - /// should be ignored and not processed 25 25 - pub rev: String, 26 26 - /// pointer (by hash) to a previous commit object for this repository. 27 27 - /// 28 28 - /// Could be used to create a chain of history, but largely unused (included 29 29 - /// for v2 backwards compatibility). In version 3 repos, this field must 30 30 - /// exist in the CBOR object, but is virtually always null. NOTE: previously 31 31 - /// specified as nullable and optional, but this caused interoperability 32 32 - /// issues. 33 33 - pub prev: Option<Cid>, 34 34 - /// cryptographic signature of this commit, as raw bytes 35 35 - #[serde(with = "serde_bytes")] 36 36 - pub sig: Vec<u8>, 37 37 - } 38 38 - 39 39 - /// MST node data schema 40 40 - #[derive(Debug, Deserialize, PartialEq)] 41 41 - #[serde(deny_unknown_fields)] 42 42 - pub struct Node { 43 43 - /// link to sub-tree Node on a lower level and with all keys sorting before 44 44 - /// keys at this node 45 45 - #[serde(rename = "l")] 46 46 - pub left: Option<Cid>, 47 47 - /// ordered list of TreeEntry objects 48 48 - /// 49 49 - /// atproto MSTs have a fanout of 4, so there can be max 4 entries. 50 50 - #[serde(rename = "e")] 51 51 - pub entries: Vec<Entry>, // maybe we can do [Option<Entry>; 4]? 52 52 - } 53 53 - 54 54 - impl Node { 55 55 - /// test if a block could possibly be a node 56 56 - /// 57 57 - /// we can't eagerly decode records except where we're *sure* they cannot be 58 58 - /// an mst node (and even then we can only attempt) because you can't know 59 59 - /// with certainty what a block is supposed to be without actually walking 60 60 - /// the tree. 61 61 - /// 62 62 - /// so if a block *could be* a node, any record converter must postpone 63 63 - /// processing. if it turns out it happens to be a very node-looking record, 64 64 - /// well, sorry, it just has to only be processed later when that's known. 65 65 - pub fn could_be(bytes: impl AsRef<[u8]>) -> bool { 66 66 - const NODE_FINGERPRINT: [u8; 3] = [ 67 67 - 0xA2, // map length 2 (for "l" and "e" keys) 68 68 - 0x61, // text length 1 69 69 - b'e', // "e" before "l" because map keys have to be lex-sorted 70 70 - // 0x8?: "e" has array (0x100 upper 3 bits) of some length 71 71 - ]; 72 72 - let bytes = bytes.as_ref(); 73 73 - bytes.starts_with(&NODE_FINGERPRINT) 74 74 - && bytes 75 75 - .get(3) 76 76 - .map(|b| b & 0b1110_0000 == 0x80) 77 77 - .unwrap_or(false) 78 78 - } 79 79 - 80 80 - /// Check if a node has any entries 81 81 - /// 82 82 - /// An empty repository with no records is represented as a single MST node 83 83 - /// with an empty array of entries. This is the only situation in which a 84 84 - /// tree may contain an empty leaf node which does not either contain keys 85 85 - /// ("entries") or point to a sub-tree containing entries. 86 86 - /// 87 87 - /// TODO: to me this is slightly unclear with respect to `l` (ask someone). 88 88 - /// ...is that what "The top of the tree must not be a an empty node which 89 89 - /// only points to a sub-tree." is referring to? 90 90 - pub fn is_empty(&self) -> bool { 91 91 - self.left.is_none() && self.entries.is_empty() 92 92 - } 93 93 - } 94 94 - 95 95 - /// TreeEntry object 96 96 - #[derive(Debug, Deserialize, PartialEq)] 97 97 - #[serde(deny_unknown_fields)] 98 98 - pub struct Entry { 99 99 - /// count of bytes shared with previous TreeEntry in this Node (if any) 100 100 - #[serde(rename = "p")] 101 101 - pub prefix_len: usize, 102 102 - /// remainder of key for this TreeEntry, after "prefixlen" have been removed 103 103 - #[serde(rename = "k", with = "serde_bytes")] 104 104 - pub keysuffix: Vec<u8>, // can we String this here? 105 105 - /// link to the record data (CBOR) for this entry 106 106 - #[serde(rename = "v")] 107 107 - pub value: Cid, 108 108 - /// link to a sub-tree Node at a lower level 109 109 - /// 110 110 - /// the lower level must have keys sorting after this TreeEntry's key (to 111 111 - /// the "right"), but before the next TreeEntry's key in this Node (if any) 112 112 - #[serde(rename = "t")] 113 113 - pub tree: Option<Cid>, 114 114 - }

-471

src/walk.rs

··· 1 1 - //! Depth-first MST traversal 2 2 - 3 3 - use crate::disk::{DiskReader, StorageErrorBase}; 4 4 - use crate::drive::{MaybeProcessedBlock, Processable}; 5 5 - use crate::mst::Node; 6 6 - use ipld_core::cid::Cid; 7 7 - use std::collections::HashMap; 8 8 - use std::convert::Infallible; 9 9 - 10 10 - /// Errors that can happen while walking 11 11 - #[derive(Debug, thiserror::Error)] 12 12 - pub enum Trip { 13 13 - #[error("empty mst nodes are not allowed")] 14 14 - NodeEmpty, 15 15 - #[error("Failed to fingerprint commit block")] 16 16 - BadCommitFingerprint, 17 17 - #[error("Failed to decode commit block: {0}")] 18 18 - BadCommit(#[from] serde_ipld_dagcbor::DecodeError<Infallible>), 19 19 - #[error("Action node error: {0}")] 20 20 - RkeyError(#[from] RkeyError), 21 21 - #[error("Encountered an rkey out of order while walking the MST")] 22 22 - RkeyOutOfOrder, 23 23 - } 24 24 - 25 25 - /// Errors that can happen while walking 26 26 - #[derive(Debug, thiserror::Error)] 27 27 - pub enum DiskTrip<E: StorageErrorBase> { 28 28 - #[error("tripped: {0}")] 29 29 - Trip(#[from] Trip), 30 30 - #[error("storage error: {0}")] 31 31 - StorageError(#[from] E), 32 32 - #[error("Decode error: {0}")] 33 33 - BincodeDecodeError(#[from] bincode::error::DecodeError), 34 34 - } 35 35 - 36 36 - /// Errors from invalid Rkeys 37 37 - #[derive(Debug, thiserror::Error)] 38 38 - pub enum RkeyError { 39 39 - #[error("Failed to compute an rkey due to invalid prefix_len")] 40 40 - EntryPrefixOutOfbounds, 41 41 - #[error("RKey was not utf-8")] 42 42 - EntryRkeyNotUtf8(#[from] std::string::FromUtf8Error), 43 43 - } 44 44 - 45 45 - /// Walker outputs 46 46 - #[derive(Debug)] 47 47 - pub enum Step<T> { 48 48 - /// We needed this CID but it's not in the block store 49 49 - Missing(Cid), 50 50 - /// Reached the end of the MST! yay! 51 51 - Finish, 52 52 - /// A record was found! 53 53 - Step { rkey: String, data: T }, 54 54 - } 55 55 - 56 56 - #[derive(Debug, Clone, PartialEq)] 57 57 - enum Need { 58 58 - Node(Cid), 59 59 - Record { rkey: String, cid: Cid }, 60 60 - } 61 61 - 62 62 - fn push_from_node(stack: &mut Vec<Need>, node: &Node) -> Result<(), RkeyError> { 63 63 - let mut entries = Vec::with_capacity(node.entries.len()); 64 64 - 65 65 - let mut prefix = vec![]; 66 66 - for entry in &node.entries { 67 67 - let mut rkey = vec![]; 68 68 - let pre_checked = prefix 69 69 - .get(..entry.prefix_len) 70 70 - .ok_or(RkeyError::EntryPrefixOutOfbounds)?; 71 71 - rkey.extend_from_slice(pre_checked); 72 72 - rkey.extend_from_slice(&entry.keysuffix); 73 73 - prefix = rkey.clone(); 74 74 - 75 75 - entries.push(Need::Record { 76 76 - rkey: String::from_utf8(rkey)?, 77 77 - cid: entry.value, 78 78 - }); 79 79 - if let Some(ref tree) = entry.tree { 80 80 - entries.push(Need::Node(*tree)); 81 81 - } 82 82 - } 83 83 - 84 84 - entries.reverse(); 85 85 - stack.append(&mut entries); 86 86 - 87 87 - if let Some(tree) = node.left { 88 88 - stack.push(Need::Node(tree)); 89 89 - } 90 90 - Ok(()) 91 91 - } 92 92 - 93 93 - /// Traverser of an atproto MST 94 94 - /// 95 95 - /// Walks the tree from left-to-right in depth-first order 96 96 - #[derive(Debug)] 97 97 - pub struct Walker { 98 98 - stack: Vec<Need>, 99 99 - prev: String, 100 100 - } 101 101 - 102 102 - impl Walker { 103 103 - pub fn new(tree_root_cid: Cid) -> Self { 104 104 - Self { 105 105 - stack: vec![Need::Node(tree_root_cid)], 106 106 - prev: "".to_string(), 107 107 - } 108 108 - } 109 109 - 110 110 - /// Advance through nodes until we find a record or can't go further 111 111 - pub fn step<T: Processable>( 112 112 - &mut self, 113 113 - blocks: &mut HashMap<Cid, MaybeProcessedBlock<T>>, 114 114 - process: impl Fn(Vec<u8>) -> T, 115 115 - ) -> Result<Step<T>, Trip> { 116 116 - loop { 117 117 - let Some(mut need) = self.stack.last() else { 118 118 - log::trace!("tried to walk but we're actually done."); 119 119 - return Ok(Step::Finish); 120 120 - }; 121 121 - 122 122 - match &mut need { 123 123 - Need::Node(cid) => { 124 124 - log::trace!("need node {cid:?}"); 125 125 - let Some(block) = blocks.remove(cid) else { 126 126 - log::trace!("node not found, resting"); 127 127 - return Ok(Step::Missing(*cid)); 128 128 - }; 129 129 - 130 130 - let MaybeProcessedBlock::Raw(data) = block else { 131 131 - return Err(Trip::BadCommitFingerprint); 132 132 - }; 133 133 - let node = 134 134 - serde_ipld_dagcbor::from_slice::<Node>(&data).map_err(Trip::BadCommit)?; 135 135 - 136 136 - // found node, make sure we remember 137 137 - self.stack.pop(); 138 138 - 139 139 - // queue up work on the found node next 140 140 - push_from_node(&mut self.stack, &node)?; 141 141 - } 142 142 - Need::Record { rkey, cid } => { 143 143 - log::trace!("need record {cid:?}"); 144 144 - let Some(data) = blocks.get_mut(cid) else { 145 145 - log::trace!("record block not found, resting"); 146 146 - return Ok(Step::Missing(*cid)); 147 147 - }; 148 148 - let rkey = rkey.clone(); 149 149 - let data = match data { 150 150 - MaybeProcessedBlock::Raw(data) => process(data.to_vec()), 151 151 - MaybeProcessedBlock::Processed(t) => t.clone(), 152 152 - }; 153 153 - 154 154 - // found node, make sure we remember 155 155 - self.stack.pop(); 156 156 - 157 157 - log::trace!("emitting a block as a step. depth={}", self.stack.len()); 158 158 - 159 159 - // rkeys *must* be in order or else the tree is invalid (or 160 160 - // we have a bug) 161 161 - if rkey <= self.prev { 162 162 - return Err(Trip::RkeyOutOfOrder); 163 163 - } 164 164 - self.prev = rkey.clone(); 165 165 - 166 166 - return Ok(Step::Step { rkey, data }); 167 167 - } 168 168 - } 169 169 - } 170 170 - } 171 171 - 172 172 - /// blocking!!!!!! 173 173 - pub fn disk_step<T: Processable, R: DiskReader>( 174 174 - &mut self, 175 175 - reader: &mut R, 176 176 - process: impl Fn(Vec<u8>) -> T, 177 177 - ) -> Result<Step<T>, DiskTrip<R::StorageError>> { 178 178 - loop { 179 179 - let Some(mut need) = self.stack.last() else { 180 180 - log::trace!("tried to walk but we're actually done."); 181 181 - return Ok(Step::Finish); 182 182 - }; 183 183 - 184 184 - match &mut need { 185 185 - Need::Node(cid) => { 186 186 - let cid_bytes = cid.to_bytes(); 187 187 - log::trace!("need node {cid:?}"); 188 188 - let Some(block_bytes) = reader.get(cid_bytes)? else { 189 189 - log::trace!("node not found, resting"); 190 190 - return Ok(Step::Missing(*cid)); 191 191 - }; 192 192 - 193 193 - let block: MaybeProcessedBlock<T> = crate::drive::decode(&block_bytes)?; 194 194 - 195 195 - let MaybeProcessedBlock::Raw(data) = block else { 196 196 - return Err(Trip::BadCommitFingerprint.into()); 197 197 - }; 198 198 - let node = 199 199 - serde_ipld_dagcbor::from_slice::<Node>(&data).map_err(Trip::BadCommit)?; 200 200 - 201 201 - // found node, make sure we remember 202 202 - self.stack.pop(); 203 203 - 204 204 - // queue up work on the found node next 205 205 - push_from_node(&mut self.stack, &node).map_err(Trip::RkeyError)?; 206 206 - } 207 207 - Need::Record { rkey, cid } => { 208 208 - log::trace!("need record {cid:?}"); 209 209 - let cid_bytes = cid.to_bytes(); 210 210 - let Some(data_bytes) = reader.get(cid_bytes)? else { 211 211 - log::trace!("record block not found, resting"); 212 212 - return Ok(Step::Missing(*cid)); 213 213 - }; 214 214 - let data: MaybeProcessedBlock<T> = crate::drive::decode(&data_bytes)?; 215 215 - let rkey = rkey.clone(); 216 216 - let data = match data { 217 217 - MaybeProcessedBlock::Raw(data) => process(data), 218 218 - MaybeProcessedBlock::Processed(t) => t.clone(), 219 219 - }; 220 220 - 221 221 - // found node, make sure we remember 222 222 - self.stack.pop(); 223 223 - 224 224 - log::trace!("emitting a block as a step. depth={}", self.stack.len()); 225 225 - 226 226 - // rkeys *must* be in order or else the tree is invalid (or 227 227 - // we have a bug) 228 228 - if rkey <= self.prev { 229 229 - return Err(DiskTrip::Trip(Trip::RkeyOutOfOrder)); 230 230 - } 231 231 - self.prev = rkey.clone(); 232 232 - 233 233 - return Ok(Step::Step { rkey, data }); 234 234 - } 235 235 - } 236 236 - } 237 237 - } 238 238 - } 239 239 - 240 240 - #[cfg(test)] 241 241 - mod test { 242 242 - use super::*; 243 243 - // use crate::mst::Entry; 244 244 - 245 245 - fn cid1() -> Cid { 246 246 - "bafyreihixenvk3ahqbytas4hk4a26w43bh6eo3w6usjqtxkpzsvi655a3m" 247 247 - .parse() 248 248 - .unwrap() 249 249 - } 250 250 - // fn cid2() -> Cid { 251 251 - // "QmY7Yh4UquoXHLPFo2XbhXkhBvFoPwmQUSa92pxnxjQuPU" 252 252 - // .parse() 253 253 - // .unwrap() 254 254 - // } 255 255 - // fn cid3() -> Cid { 256 256 - // "bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi" 257 257 - // .parse() 258 258 - // .unwrap() 259 259 - // } 260 260 - // fn cid4() -> Cid { 261 261 - // "QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR" 262 262 - // .parse() 263 263 - // .unwrap() 264 264 - // } 265 265 - // fn cid5() -> Cid { 266 266 - // "QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D" 267 267 - // .parse() 268 268 - // .unwrap() 269 269 - // } 270 270 - // fn cid6() -> Cid { 271 271 - // "QmdmQXB2mzChmMeKY47C43LxUdg1NDJ5MWcKMKxDu7RgQm" 272 272 - // .parse() 273 273 - // .unwrap() 274 274 - // } 275 275 - // fn cid7() -> Cid { 276 276 - // "bafybeiaysi4s6lnjev27ln5icwm6tueaw2vdykrtjkwiphwekaywqhcjze" 277 277 - // .parse() 278 278 - // .unwrap() 279 279 - // } 280 280 - // fn cid8() -> Cid { 281 281 - // "bafyreif3tfdpr5n4jdrbielmcapwvbpcthepfkwq2vwonmlhirbjmotedi" 282 282 - // .parse() 283 283 - // .unwrap() 284 284 - // } 285 285 - // fn cid9() -> Cid { 286 286 - // "bafyreicnokmhmrnlp2wjhyk2haep4tqxiptwfrp2rrs7rzq7uk766chqvq" 287 287 - // .parse() 288 288 - // .unwrap() 289 289 - // } 290 290 - 291 291 - #[test] 292 292 - fn test_next_from_node_empty() { 293 293 - let node = Node { 294 294 - left: None, 295 295 - entries: vec![], 296 296 - }; 297 297 - let mut stack = vec![]; 298 298 - push_from_node(&mut stack, &node).unwrap(); 299 299 - assert_eq!(stack.last(), None); 300 300 - } 301 301 - 302 302 - #[test] 303 303 - fn test_needs_from_node_just_left() { 304 304 - let node = Node { 305 305 - left: Some(cid1()), 306 306 - entries: vec![], 307 307 - }; 308 308 - let mut stack = vec![]; 309 309 - push_from_node(&mut stack, &node).unwrap(); 310 310 - assert_eq!(stack.last(), Some(Need::Node(cid1())).as_ref()); 311 311 - } 312 312 - 313 313 - // #[test] 314 314 - // fn test_needs_from_node_just_one_record() { 315 315 - // let node = Node { 316 316 - // left: None, 317 317 - // entries: vec![Entry { 318 318 - // keysuffix: "asdf".into(), 319 319 - // prefix_len: 0, 320 320 - // value: cid1(), 321 321 - // tree: None, 322 322 - // }], 323 323 - // }; 324 324 - // assert_eq!( 325 325 - // needs_from_node(node).unwrap(), 326 326 - // vec![Need::Record { 327 327 - // rkey: "asdf".into(), 328 328 - // cid: cid1(), 329 329 - // },] 330 330 - // ); 331 331 - // } 332 332 - 333 333 - // #[test] 334 334 - // fn test_needs_from_node_two_records() { 335 335 - // let node = Node { 336 336 - // left: None, 337 337 - // entries: vec![ 338 338 - // Entry { 339 339 - // keysuffix: "asdf".into(), 340 340 - // prefix_len: 0, 341 341 - // value: cid1(), 342 342 - // tree: None, 343 343 - // }, 344 344 - // Entry { 345 345 - // keysuffix: "gh".into(), 346 346 - // prefix_len: 2, 347 347 - // value: cid2(), 348 348 - // tree: None, 349 349 - // }, 350 350 - // ], 351 351 - // }; 352 352 - // assert_eq!( 353 353 - // needs_from_node(node).unwrap(), 354 354 - // vec![ 355 355 - // Need::Record { 356 356 - // rkey: "asdf".into(), 357 357 - // cid: cid1(), 358 358 - // }, 359 359 - // Need::Record { 360 360 - // rkey: "asgh".into(), 361 361 - // cid: cid2(), 362 362 - // }, 363 363 - // ] 364 364 - // ); 365 365 - // } 366 366 - 367 367 - // #[test] 368 368 - // fn test_needs_from_node_with_both() { 369 369 - // let node = Node { 370 370 - // left: None, 371 371 - // entries: vec![Entry { 372 372 - // keysuffix: "asdf".into(), 373 373 - // prefix_len: 0, 374 374 - // value: cid1(), 375 375 - // tree: Some(cid2()), 376 376 - // }], 377 377 - // }; 378 378 - // assert_eq!( 379 379 - // needs_from_node(node).unwrap(), 380 380 - // vec![ 381 381 - // Need::Record { 382 382 - // rkey: "asdf".into(), 383 383 - // cid: cid1(), 384 384 - // }, 385 385 - // Need::Node(cid2()), 386 386 - // ] 387 387 - // ); 388 388 - // } 389 389 - 390 390 - // #[test] 391 391 - // fn test_needs_from_node_left_and_record() { 392 392 - // let node = Node { 393 393 - // left: Some(cid1()), 394 394 - // entries: vec![Entry { 395 395 - // keysuffix: "asdf".into(), 396 396 - // prefix_len: 0, 397 397 - // value: cid2(), 398 398 - // tree: None, 399 399 - // }], 400 400 - // }; 401 401 - // assert_eq!( 402 402 - // needs_from_node(node).unwrap(), 403 403 - // vec![ 404 404 - // Need::Node(cid1()), 405 405 - // Need::Record { 406 406 - // rkey: "asdf".into(), 407 407 - // cid: cid2(), 408 408 - // }, 409 409 - // ] 410 410 - // ); 411 411 - // } 412 412 - 413 413 - // #[test] 414 414 - // fn test_needs_from_full_node() { 415 415 - // let node = Node { 416 416 - // left: Some(cid1()), 417 417 - // entries: vec![ 418 418 - // Entry { 419 419 - // keysuffix: "asdf".into(), 420 420 - // prefix_len: 0, 421 421 - // value: cid2(), 422 422 - // tree: Some(cid3()), 423 423 - // }, 424 424 - // Entry { 425 425 - // keysuffix: "ghi".into(), 426 426 - // prefix_len: 1, 427 427 - // value: cid4(), 428 428 - // tree: Some(cid5()), 429 429 - // }, 430 430 - // Entry { 431 431 - // keysuffix: "jkl".into(), 432 432 - // prefix_len: 2, 433 433 - // value: cid6(), 434 434 - // tree: Some(cid7()), 435 435 - // }, 436 436 - // Entry { 437 437 - // keysuffix: "mno".into(), 438 438 - // prefix_len: 4, 439 439 - // value: cid8(), 440 440 - // tree: Some(cid9()), 441 441 - // }, 442 442 - // ], 443 443 - // }; 444 444 - // assert_eq!( 445 445 - // needs_from_node(node).unwrap(), 446 446 - // vec![ 447 447 - // Need::Node(cid1()), 448 448 - // Need::Record { 449 449 - // rkey: "asdf".into(), 450 450 - // cid: cid2(), 451 451 - // }, 452 452 - // Need::Node(cid3()), 453 453 - // Need::Record { 454 454 - // rkey: "aghi".into(), 455 455 - // cid: cid4(), 456 456 - // }, 457 457 - // Need::Node(cid5()), 458 458 - // Need::Record { 459 459 - // rkey: "agjkl".into(), 460 460 - // cid: cid6(), 461 461 - // }, 462 462 - // Need::Node(cid7()), 463 463 - // Need::Record { 464 464 - // rkey: "agjkmno".into(), 465 465 - // cid: cid8(), 466 466 - // }, 467 467 - // Need::Node(cid9()), 468 468 - // ] 469 469 - // ); 470 470 - // } 471 471 - }

+34 -31

tests/non-huge-cars.rs

··· 1 1 extern crate repo_stream; 2 2 - use futures::TryStreamExt; 3 3 - use iroh_car::CarReader; 4 4 - use std::convert::Infallible; 2 2 + use repo_stream::Driver; 5 3 4 4 + const EMPTY_CAR: &'static [u8] = include_bytes!("../car-samples/empty.car"); 6 5 const TINY_CAR: &'static [u8] = include_bytes!("../car-samples/tiny.car"); 7 6 const LITTLE_CAR: &'static [u8] = include_bytes!("../car-samples/little.car"); 8 7 const MIDSIZE_CAR: &'static [u8] = include_bytes!("../car-samples/midsize.car"); 9 8 10 10 - async fn test_car(bytes: &[u8], expected_records: usize, expected_sum: usize) { 11 11 - let reader = CarReader::new(bytes).await.unwrap(); 12 12 - 13 13 - let root = reader 14 14 - .header() 15 15 - .roots() 16 16 - .first() 17 17 - .ok_or("missing root") 9 9 + async fn test_car( 10 10 + bytes: &[u8], 11 11 + expected_records: usize, 12 12 + expected_sum: usize, 13 13 + expect_profile: bool, 14 14 + ) { 15 15 + let mut driver = match Driver::load_car(bytes, |block| block.len(), 10 /* MiB */) 16 16 + .await 18 17 .unwrap() 19 19 - .clone(); 20 20 - 21 21 - let stream = std::pin::pin!(reader.stream()); 22 22 - 23 23 - let (_commit, v) = 24 24 - repo_stream::drive::Vehicle::init(root, stream, |block| Ok::<_, Infallible>(block.len())) 25 25 - .await 26 26 - .unwrap(); 27 27 - let mut record_stream = std::pin::pin!(v.stream()); 18 18 + { 19 19 + Driver::Memory(_commit, mem_driver) => mem_driver, 20 20 + Driver::Disk(_) => panic!("too big"), 21 21 + }; 28 22 29 23 let mut records = 0; 30 24 let mut sum = 0; 31 25 let mut found_bsky_profile = false; 32 26 let mut prev_rkey = "".to_string(); 33 33 - while let Some((rkey, size)) = record_stream.try_next().await.unwrap() { 34 34 - records += 1; 35 35 - sum += size; 36 36 - if rkey == "app.bsky.actor.profile/self" { 37 37 - found_bsky_profile = true; 27 27 + 28 28 + while let Some(pairs) = driver.next_chunk(256).await.unwrap() { 29 29 + for (rkey, size) in pairs { 30 30 + records += 1; 31 31 + sum += size; 32 32 + if rkey == "app.bsky.actor.profile/self" { 33 33 + found_bsky_profile = true; 34 34 + } 35 35 + assert!(rkey > prev_rkey, "rkeys are streamed in order"); 36 36 + prev_rkey = rkey; 38 37 } 39 39 - assert!(rkey > prev_rkey, "rkeys are streamed in order"); 40 40 - prev_rkey = rkey; 41 38 } 39 39 + 42 40 assert_eq!(records, expected_records); 43 41 assert_eq!(sum, expected_sum); 44 44 - assert!(found_bsky_profile); 42 42 + assert_eq!(found_bsky_profile, expect_profile); 43 43 + } 44 44 + 45 45 + #[tokio::test] 46 46 + async fn test_empty_car() { 47 47 + test_car(EMPTY_CAR, 0, 0, false).await 45 48 } 46 49 47 50 #[tokio::test] 48 51 async fn test_tiny_car() { 49 49 - test_car(TINY_CAR, 8, 2071).await 52 52 + test_car(TINY_CAR, 8, 2071, true).await 50 53 } 51 54 52 55 #[tokio::test] 53 56 async fn test_little_car() { 54 54 - test_car(LITTLE_CAR, 278, 246960).await 57 57 + test_car(LITTLE_CAR, 278, 246960, true).await 55 58 } 56 59 57 60 #[tokio::test] 58 61 async fn test_midsize_car() { 59 59 - test_car(MIDSIZE_CAR, 11585, 3741393).await 62 62 + test_car(MIDSIZE_CAR, 11585, 3741393, true).await 60 63 }