microcosm.blue
Fast and robust atproto CAR file processing in rust
bench it
actually can't really beat multihash
oh well
bad-example.com
+4
Cargo.toml
+4
Cargo.toml
+39
benches/cid-check.rs
+39
benches/cid-check.rs
···
1
+
use criterion::{Criterion, criterion_group, criterion_main};
2
+
use multihash_codetable::{Code, MultihashDigest};
3
+
use cid::Cid;
4
+
use sha2::{Digest, Sha256};
5
+
6
+
fn multihash_verify(given: Cid, block: &[u8]) -> bool {
7
+
let calculated = Cid::new_v1(0x71, Code::Sha2_256.digest(block));
8
+
calculated == given
9
+
}
10
+
11
+
fn effortful_verify(given: Cid, block: &[u8]) -> bool {
12
+
// we know we're in atproto, so we can make a few assumptions
13
+
if given.version() != cid::Version::V1 {
14
+
return false;
15
+
}
16
+
let (codec, given_digest, _) = given.hash().into_inner();
17
+
if codec != 0x12 {
18
+
return false;
19
+
}
20
+
given_digest[..32] == *Sha256::digest(block)
21
+
}
22
+
23
+
fn fastloose_verify(given: Cid, block: &[u8]) -> bool {
24
+
let (_, given_digest, _) = given.hash().into_inner();
25
+
given_digest[..32] == *Sha256::digest(block)
26
+
}
27
+
28
+
pub fn criterion_benchmark(c: &mut Criterion) {
29
+
let some_bytes: Vec<u8> = vec![0x1a, 0x00, 0xAA, 0x39, 0x8C].repeat(100);
30
+
let cid = Cid::new_v1(0x71, Code::Sha2_256.digest(&some_bytes));
31
+
32
+
let mut g = c.benchmark_group("CID check");
33
+
g.bench_function("multihash", |b| b.iter(|| multihash_verify(cid, &some_bytes)));
34
+
g.bench_function("effortful", |b| b.iter(|| effortful_verify(cid, &some_bytes)));
35
+
g.bench_function("fastloose", |b| b.iter(|| fastloose_verify(cid, &some_bytes)));
36
+
}
37
+
38
+
criterion_group!(benches, criterion_benchmark);
39
+
criterion_main!(benches);
+7
-13
src/drive.rs
+7
-13
src/drive.rs
···
1
1
//! Consume a CAR from an AsyncRead, producing an ordered stream of records
2
2
3
+
use multihash_codetable::{MultihashDigest, Code};
3
4
use crate::{
4
5
Bytes, HashMap,
5
6
disk::{DiskError, DiskStore},
···
10
11
use iroh_car::CarReader;
11
12
use std::convert::Infallible;
12
13
use tokio::{io::AsyncRead, sync::mpsc};
13
-
use sha2::{Digest, Sha256};
14
14
15
15
use crate::mst::Commit;
16
16
use crate::walk::{WalkError, Walker};
···
122
122
#[inline]
123
123
pub fn noop(block: Bytes) -> Bytes {
124
124
block
125
+
}
126
+
127
+
// iroh-car doesn't verify CIDs!!!!!!
128
+
#[inline(always)]
129
+
fn verify_block(given: Cid, block: &[u8]) -> bool {
130
+
Cid::new_v1(0x71, Code::Sha2_256.digest(block)) == given
125
131
}
126
132
127
133
/// Builder-style driver setup
···
302
308
max_size: usize,
303
309
mem_blocks: HashMap<Cid, MaybeProcessedBlock>,
304
310
pub commit: Option<Commit>,
305
-
}
306
-
307
-
fn verify_block(given: Cid, block: &[u8]) -> bool {
308
-
// we know we're in atproto, so we can make a few assumptions
309
-
if given.version() != cid::Version::V1 {
310
-
return false;
311
-
}
312
-
let (codec, given_digest, _) = given.hash().into_inner();
313
-
if codec != 0x12 {
314
-
return false;
315
-
}
316
-
given_digest[..32] == *Sha256::digest(block)
317
311
}
318
312
319
313
impl<R: AsyncRead + Unpin> NeedDisk<R> {