From dd5d76e2ed2907eec5dce1c0eaea9df31caef27c Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 12 Sep 2019 17:39:25 +0200 Subject: [PATCH] Basic BinaryCacheStore implementation using async Rust --- nix-rust/Cargo.lock | 1599 +++++++++++++++++++++++++++- nix-rust/Cargo.toml | 5 + nix-rust/local.mk | 6 +- nix-rust/src/binary_cache_store.rs | 51 + nix-rust/src/error.rs | 18 +- nix-rust/src/lib.rs | 38 + nix-rust/src/path_info.rs | 70 ++ nix-rust/src/store.rs | 101 ++ 8 files changed, 1877 insertions(+), 11 deletions(-) create mode 100644 nix-rust/src/binary_cache_store.rs create mode 100644 nix-rust/src/path_info.rs create mode 100644 nix-rust/src/store.rs diff --git a/nix-rust/Cargo.lock b/nix-rust/Cargo.lock index 0112ed471..5a5b1fbd7 100644 --- a/nix-rust/Cargo.lock +++ b/nix-rust/Cargo.lock @@ -1,32 +1,926 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. +[[package]] +name = "adler32" +version = "1.0.4" +source = 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-ldl -lssl ifeq ($(OS), Darwin) libnixrust_BUILD_FLAGS = NIX_LDFLAGS="-undefined dynamic_lookup" @@ -21,7 +21,7 @@ endif $(libnixrust_PATH): $(wildcard $(d)/src/*.rs) $(d)/Cargo.toml $(trace-gen) cd nix-rust && CARGO_HOME=$$(if [[ -d vendor ]]; then echo vendor; fi) \ $(libnixrust_BUILD_FLAGS) \ - cargo build $(RUST_MODE) $$(if [[ -d vendor ]]; then echo --offline; fi) \ + RUSTC_BOOTSTRAP=1 cargo build $(RUST_MODE) $$(if [[ -d vendor ]]; then echo --offline; fi) \ && touch target/$(RUST_DIR)/libnixrust.$(SO_EXT) $(libnixrust_INSTALL_PATH): $(libnixrust_PATH) diff --git a/nix-rust/src/binary_cache_store.rs b/nix-rust/src/binary_cache_store.rs new file mode 100644 index 000000000..b7e61eb2d --- /dev/null +++ b/nix-rust/src/binary_cache_store.rs @@ -0,0 +1,51 @@ +use crate::store::{Store, StorePath}; +use crate::path_info::PathInfo; +use crate::Error; +use futures::compat::Future01CompatExt; + +pub struct BinaryCacheStore { + base_uri: String, + client: reqwest::r#async::Client, +} + +impl BinaryCacheStore { + pub fn new(base_uri: String) -> Self { + Self { + base_uri, + client: reqwest::r#async::Client::new(), + } + } +} + +impl Store for BinaryCacheStore { + fn query_path_info( + &self, + path: &StorePath, + ) -> std::pin::Pin> + Send>> { + let uri = format!("{}/{}.narinfo", self.base_uri.clone(), path.hash); + let path = path.clone(); + let client = self.client.clone(); + let store_dir = self.store_dir().to_string(); + + Box::pin(async move { + let response = client + .get(&uri) + .send() + .compat() + .await?; + + if response.status() == reqwest::StatusCode::NOT_FOUND || response.status() == reqwest::StatusCode::FORBIDDEN { + return Err(Error::InvalidPath(path)); + } + + let mut response = response.error_for_status()?; + + let body = response + .text() + .compat() + .await?; + + PathInfo::parse_nar_info(&body, &store_dir) + }) + } +} diff --git a/nix-rust/src/error.rs b/nix-rust/src/error.rs index 519007ea0..08b9bcac2 100644 --- a/nix-rust/src/error.rs +++ b/nix-rust/src/error.rs @@ -1,6 +1,10 @@ #[derive(Debug)] pub enum Error { + InvalidPath(crate::store::StorePath), + BadStorePath(std::path::PathBuf), + BadNarInfo, IOError(std::io::Error), + HttpError(reqwest::Error), Misc(String), Foreign(CppException), } @@ -11,12 +15,24 @@ impl From for Error { } } +impl From for Error { + fn from(err: reqwest::Error) -> Self { + Error::HttpError(err) + } +} + impl From for CppException { fn from(err: Error) -> Self { match err { + Error::InvalidPath(_) => unsafe { make_error("invalid path") }, // FIXME + Error::BadNarInfo => unsafe { make_error(".narinfo file is corrupt") }, // FIXME + Error::BadStorePath(path) => unsafe { + make_error(&format!("path '{}' is not a store path", path.display())) + }, // FIXME + Error::IOError(err) => unsafe { make_error(&err.to_string()) }, + Error::HttpError(err) => unsafe { make_error(&err.to_string()) }, Error::Foreign(ex) => ex, Error::Misc(s) => unsafe { make_error(&s) }, - Error::IOError(err) => unsafe { make_error(&err.to_string()) }, } } } diff --git a/nix-rust/src/lib.rs b/nix-rust/src/lib.rs index 1b88ac8af..7445e005c 100644 --- a/nix-rust/src/lib.rs +++ b/nix-rust/src/lib.rs @@ -1,6 +1,11 @@ +#![feature(await_macro, async_await)] + +mod binary_cache_store; mod error; mod foreign; +mod store; mod tarfile; +mod path_info; pub use error::Error; @@ -30,3 +35,36 @@ pub extern "C" fn unpack_tarfile( ) -> CBox> { CBox::new(tarfile::unpack_tarfile(source, dest_dir).map_err(|err| err.into())) } + +#[no_mangle] +pub extern "C" fn rust_test() { + use crate::store::Store; + use futures::future::{FutureExt, TryFutureExt}; + use std::path::Path; + + let fut = async move { + let store: Box = Box::new(binary_cache_store::BinaryCacheStore::new( + "https://cache.nixos.org".to_string(), + )); + + let path = store + .parse_store_path(&Path::new( + "/nix/store/7h7qgvs4kgzsn8a6rb273saxyqh4jxlz-konsole-18.12.3", + )) + .unwrap(); + + /* + let info = store.query_path_info(&path).await.unwrap(); + + eprintln!("INFO = {:?}", info); + */ + + let closure = store.compute_path_closure(vec![path].into_iter().collect()).await.unwrap(); + + eprintln!("CLOSURE = {:?}", closure.len()); + + Ok(()) + }; + + tokio::run(fut.boxed().compat()); +} diff --git a/nix-rust/src/path_info.rs b/nix-rust/src/path_info.rs new file mode 100644 index 000000000..2759e03d4 --- /dev/null +++ b/nix-rust/src/path_info.rs @@ -0,0 +1,70 @@ +use crate::store::StorePath; +use crate::Error; +use std::collections::BTreeSet; + +#[derive(Clone, Debug)] +pub struct PathInfo { + pub path: StorePath, + pub references: BTreeSet, + pub nar_size: u64, + pub deriver: Option, + + // Additional binary cache info. + pub url: Option, + pub compression: Option, + pub file_size: Option, +} + +impl PathInfo { + pub fn parse_nar_info(nar_info: &str, store_dir: &str) -> Result { + let mut path = None; + let mut references = BTreeSet::new(); + let mut nar_size = None; + let mut deriver = None; + let mut url = None; + let mut compression = None; + let mut file_size = None; + + for line in nar_info.lines() { + let colon = line.find(':').ok_or(Error::BadNarInfo)?; + + let (name, value) = line.split_at(colon); + + if !value.starts_with(": ") { + return Err(Error::BadNarInfo); + } + + let value = &value[2..]; + + if name == "StorePath" { + path = Some(StorePath::new(std::path::Path::new(value), store_dir)?); + } else if name == "NarSize" { + nar_size = Some(u64::from_str_radix(value, 10).map_err(|_| Error::BadNarInfo)?); + } else if name == "References" { + if !value.is_empty() { + for r in value.split(' ') { + references.insert(StorePath::new_short(r)?); + } + } + } else if name == "Deriver" { + deriver = Some(StorePath::new_short(value)?); + } else if name == "URL" { + url = Some(value.into()); + } else if name == "Compression" { + compression = Some(value.into()); + } else if name == "FileSize" { + file_size = Some(u64::from_str_radix(value, 10).map_err(|_| Error::BadNarInfo)?); + } + } + + Ok(PathInfo { + path: path.ok_or(Error::BadNarInfo)?, + references, + nar_size: nar_size.ok_or(Error::BadNarInfo)?, + deriver, + url: Some(url.ok_or(Error::BadNarInfo)?), + compression, + file_size, + }) + } +} diff --git a/nix-rust/src/store.rs b/nix-rust/src/store.rs new file mode 100644 index 000000000..256dcf0f3 --- /dev/null +++ b/nix-rust/src/store.rs @@ -0,0 +1,101 @@ +use crate::path_info::PathInfo; +use crate::Error; +use std::collections::{BTreeMap, BTreeSet}; +use std::path::Path; + +#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug)] +pub struct StorePath { + pub hash: String, + pub name: String, +} + +pub const STORE_PATH_HASH_CHARS: usize = 32; + +impl StorePath { + pub fn new(path: &Path, store_dir: &str) -> Result { + // FIXME: check store_dir + Self::new_short( + path.file_name() + .ok_or(Error::BadStorePath(path.into()))? + .to_str() + .ok_or(Error::BadStorePath(path.into()))?, + ) + } + + pub fn new_short(base_name: &str) -> Result { + if base_name.len() < STORE_PATH_HASH_CHARS + 2 + || base_name.as_bytes()[STORE_PATH_HASH_CHARS] != '-' as u8 + { + return Err(Error::BadStorePath(base_name.into())); + } + + // FIXME: validate name + + Ok(StorePath { + hash: base_name[0..STORE_PATH_HASH_CHARS].to_string(), + name: base_name[STORE_PATH_HASH_CHARS + 1..].to_string(), + }) + } +} + +#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Debug)] +pub struct StorePathHash { + bytes: [u8; 20], +} + +/* +impl StorePathHash { + pub fn to_base32(&self) -> String { + "7h7qgvs4kgzsn8a6rb273saxyqh4jxlz".to_string() + } +} +*/ + +pub trait Store: Send + Sync { + fn store_dir(&self) -> &str { + "/nix/store" + } + + fn query_path_info( + &self, + store_path: &StorePath, + ) -> std::pin::Pin> + Send>>; +} + +impl dyn Store { + pub fn parse_store_path(&self, path: &Path) -> Result { + StorePath::new(path, self.store_dir()) + } + + pub async fn compute_path_closure( + &self, + roots: BTreeSet, + ) -> Result, Error> { + let mut done = BTreeSet::new(); + let mut result = BTreeMap::new(); + let mut pending = vec![]; + + for root in roots { + pending.push(self.query_path_info(&root)); + done.insert(root); + } + + while !pending.is_empty() { + let (info, _, remaining) = futures::future::select_all(pending).await; + pending = remaining; + + let info = info?; + + for path in &info.references { + if !done.contains(path) { + pending.push(self.query_path_info(&path)); + done.insert(path.clone()); + } + } + + result.insert(info.path.clone(), info); + } + + Ok(result) + } +}