microcosm.blue
Fast and robust atproto CAR file processing in rust
fmt
bad-example.com
+77
-92
+4
-9
benches/huge-car.rs
+4
-9
benches/huge-car.rs
···
32
32
let reader = tokio::fs::File::open(filename).await.unwrap();
33
33
let reader = tokio::io::BufReader::new(reader);
34
34
35
-
let mut driver =
36
-
match Driver::load_car(reader, ser, 1024)
37
-
.await
38
-
.unwrap()
39
-
.unwrap()
40
-
{
41
-
Driver::Memory(_, mem_driver) => mem_driver,
42
-
Driver::Disk(_) => panic!("not doing disk for benchmark"),
43
-
};
35
+
let mut driver = match Driver::load_car(reader, ser, 1024).await.unwrap().unwrap() {
36
+
Driver::Memory(_, mem_driver) => mem_driver,
37
+
Driver::Disk(_) => panic!("not doing disk for benchmark"),
38
+
};
44
39
45
40
let mut n = 0;
46
41
while let Some(pairs) = driver.next_chunk(256).await.unwrap() {
+22
-25
benches/leading.rs
+22
-25
benches/leading.rs
···
1
-
use criterion::{Criterion, BatchSize, criterion_group, criterion_main};
2
-
use sha2::{Sha256, Digest};
1
+
use criterion::{BatchSize, Criterion, criterion_group, criterion_main};
3
2
use hmac_sha256::Hash;
3
+
use sha2::{Digest, Sha256};
4
4
5
5
pub fn compute(bytes: [u8; 32]) -> u32 {
6
6
let mut zeros = 0;
···
16
16
}
17
17
18
18
pub fn compute2(bytes: [u8; 32]) -> u32 {
19
-
u128::from_be_bytes(bytes.split_at(16).0.try_into().unwrap())
20
-
.leading_zeros() / 2
19
+
u128::from_be_bytes(bytes.split_at(16).0.try_into().unwrap()).leading_zeros() / 2
21
20
}
22
21
23
22
fn from_key_old(key: &[u8]) -> u32 {
···
30
29
31
30
pub fn criterion_benchmark(c: &mut Criterion) {
32
31
for (name, case) in [
33
-
("no zeros", [0xFF; 32]),
34
-
("two zeros", [0x3F; 32]),
35
-
("some zeros", [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]),
36
-
("many zeros", [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]),
32
+
("no zeros", [0xFF; 32]),
33
+
("two zeros", [0x3F; 32]),
34
+
(
35
+
"some zeros",
36
+
[
37
+
0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
38
+
1, 1, 1, 1,
39
+
],
40
+
),
41
+
(
42
+
"many zeros",
43
+
[
44
+
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45
+
1, 1, 1, 1,
46
+
],
47
+
),
37
48
] {
38
49
let mut g = c.benchmark_group(name);
39
50
g.bench_function("old", |b| {
40
-
b.iter_batched(
41
-
|| case.clone(),
42
-
|c| compute(c),
43
-
BatchSize::SmallInput,
44
-
)
51
+
b.iter_batched(|| case.clone(), |c| compute(c), BatchSize::SmallInput)
45
52
});
46
53
g.bench_function("new", |b| {
47
-
b.iter_batched(
48
-
|| case.clone(),
49
-
|c| compute2(c),
50
-
BatchSize::SmallInput,
51
-
)
54
+
b.iter_batched(|| case.clone(), |c| compute2(c), BatchSize::SmallInput)
52
55
});
53
56
}
54
57
55
-
for case in [
56
-
"a",
57
-
"aa",
58
-
"aaa",
59
-
"aaaa",
60
-
] {
58
+
for case in ["a", "aa", "aaa", "aaaa"] {
61
59
let mut g = c.benchmark_group(case);
62
60
g.bench_function("old", |b| b.iter(|| from_key_old(case.as_bytes())));
63
61
g.bench_function("new", |b| b.iter(|| from_key_new(case.as_bytes())));
64
62
}
65
63
}
66
-
67
64
68
65
criterion_group!(benches, criterion_benchmark);
69
66
criterion_main!(benches);
+1
-4
benches/non-huge-cars.rs
+1
-4
benches/non-huge-cars.rs
···
39
39
}
40
40
41
41
async fn drive_car(bytes: &[u8]) -> usize {
42
-
let mut driver = match Driver::load_car(bytes, ser, 32)
43
-
.await
44
-
.unwrap()
45
-
{
42
+
let mut driver = match Driver::load_car(bytes, ser, 32).await.unwrap() {
46
43
None => return 0,
47
44
Some(Driver::Memory(_, mem_driver)) => mem_driver,
48
45
Some(Driver::Disk(_)) => panic!("not benching big cars here"),
+1
-2
src/disk.rs
+1
-2
src/disk.rs
+13
-7
src/drive.rs
+13
-7
src/drive.rs
···
1
1
//! Consume a CAR from an AsyncRead, producing an ordered stream of records
2
2
3
-
use crate::walk::Output;
4
-
use crate::Bytes;
5
-
use crate::HashMap;
6
-
use crate::disk::{DiskError, DiskStore};
7
-
use crate::mst::MstNode;
3
+
use crate::{
4
+
Bytes, HashMap,
5
+
disk::{DiskError, DiskStore},
6
+
mst::MstNode,
7
+
walk::Output,
8
+
};
8
9
use cid::Cid;
9
10
use iroh_car::CarReader;
10
11
use std::convert::Infallible;
···
254
255
let commit = commit.ok_or(DriveError::MissingCommit)?;
255
256
256
257
// the commit always must point to a Node; empty node => empty MST special case
257
-
let root_node: MstNode = match mem_blocks.get(&commit.data).ok_or(DriveError::MissingCommit)? {
258
+
let root_node: MstNode = match mem_blocks
259
+
.get(&commit.data)
260
+
.ok_or(DriveError::MissingCommit)?
261
+
{
258
262
MaybeProcessedBlock::Processed(_) => Err(WalkError::BadCommitFingerprint)?,
259
263
MaybeProcessedBlock::Raw(bytes) => serde_ipld_dagcbor::from_slice(bytes)?,
260
264
};
···
300
304
let mut out = Vec::with_capacity(n);
301
305
for _ in 0..n {
302
306
// walk as far as we can until we run out of blocks or find a record
303
-
let Some(Output { rkey, cid: _, data }) = self.walker.step(&mut self.blocks, self.process)? else {
307
+
let Some(Output { rkey, cid: _, data }) =
308
+
self.walker.step(&mut self.blocks, self.process)?
309
+
else {
304
310
break;
305
311
};
306
312
out.push((rkey, data));
+19
-14
src/mst.rs
+19
-14
src/mst.rs
···
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
-
use sha2::{Digest, Sha256};
7
6
use cid::Cid;
8
7
use serde::Deserialize;
8
+
use sha2::{Digest, Sha256};
9
9
10
10
/// The top-level data object in a repository's tree is a signed commit.
11
11
#[derive(Debug, Deserialize)]
···
37
37
pub sig: serde_bytes::ByteBuf,
38
38
}
39
39
40
-
use serde::de::{self, Deserializer, Visitor, MapAccess, Unexpected};
40
+
use serde::de::{self, Deserializer, MapAccess, Unexpected, Visitor};
41
41
use std::fmt;
42
42
43
43
pub type Depth = u32;
···
97
97
}
98
98
found_left = true;
99
99
if let Some(cid) = map.next_value()? {
100
-
left = Some(NodeThing { cid, kind: ThingKind::Tree });
100
+
left = Some(NodeThing {
101
+
cid,
102
+
kind: ThingKind::Tree,
103
+
});
101
104
}
102
105
}
103
106
"e" => {
···
110
113
111
114
for entry in map.next_value::<Vec<Entry>>()? {
112
115
let mut rkey: Vec<u8> = vec![];
113
-
let pre_checked = prefix
114
-
.get(..entry.prefix_len)
115
-
.ok_or_else(|| de::Error::invalid_value(
116
-
Unexpected::Bytes(&prefix),
117
-
&"a prefix at least as long as the prefix_len",
118
-
))?;
116
+
let pre_checked =
117
+
prefix.get(..entry.prefix_len).ok_or_else(|| {
118
+
de::Error::invalid_value(
119
+
Unexpected::Bytes(&prefix),
120
+
&"a prefix at least as long as the prefix_len",
121
+
)
122
+
})?;
119
123
120
124
rkey.extend_from_slice(pre_checked);
121
125
rkey.extend_from_slice(&entry.keysuffix);
122
126
123
-
let rkey_s = String::from_utf8(rkey.clone())
124
-
.map_err(|_| de::Error::invalid_value(
127
+
let rkey_s = String::from_utf8(rkey.clone()).map_err(|_| {
128
+
de::Error::invalid_value(
125
129
Unexpected::Bytes(&rkey),
126
130
&"a valid utf-8 rkey",
127
-
))?;
131
+
)
132
+
})?;
128
133
129
134
let key_depth = atproto_mst_depth(&rkey_s);
130
135
if depth.is_none() {
···
150
155
151
156
prefix = rkey;
152
157
}
153
-
},
154
-
f => return Err(de::Error::unknown_field(f, NODE_FIELDS))
158
+
}
159
+
f => return Err(de::Error::unknown_field(f, NODE_FIELDS)),
155
160
}
156
161
}
157
162
if !found_left {
+16
-26
src/walk.rs
+16
-26
src/walk.rs
···
1
1
//! Depth-first MST traversal
2
2
3
-
use crate::mst::NodeThing;
4
-
use crate::mst::ThingKind;
5
-
use crate::mst::MstNode;
6
-
use crate::mst::Depth;
7
-
use crate::Bytes;
8
-
use crate::HashMap;
9
-
use crate::disk::DiskStore;
10
-
use crate::drive::MaybeProcessedBlock;
3
+
use crate::mst::{Depth, MstNode, NodeThing, ThingKind};
4
+
use crate::{Bytes, HashMap, disk::DiskStore, drive::MaybeProcessedBlock};
11
5
use cid::Cid;
12
6
use std::convert::Infallible;
13
7
···
60
54
}
61
55
62
56
impl Walker {
63
-
pub fn new(
64
-
root_node: MstNode,
65
-
) -> Option<Self> {
57
+
pub fn new(root_node: MstNode) -> Option<Self> {
66
58
Some(Self {
67
59
prev_rkey: "".to_string(),
68
60
root_depth: root_node.depth?,
···
93
85
self.prev_rkey = rkey.clone();
94
86
95
87
log::trace!("val @ {rkey}");
96
-
Ok(Some(Output {
97
-
rkey,
98
-
cid,
99
-
data,
100
-
}))
88
+
Ok(Some(Output { rkey, cid, data }))
101
89
}
102
90
ThingKind::Tree => {
103
91
let MaybeProcessedBlock::Raw(data) = mpb else {
104
92
return Err(WalkError::BadCommitFingerprint);
105
93
};
106
94
107
-
let node: MstNode = serde_ipld_dagcbor::from_slice(&data)
108
-
.map_err(WalkError::BadCommit)?;
95
+
let node: MstNode =
96
+
serde_ipld_dagcbor::from_slice(data).map_err(WalkError::BadCommit)?;
109
97
110
98
if node.is_empty() {
111
99
return Err(WalkError::MstError(MstError::EmptyNode));
112
100
}
113
101
114
102
let current_depth = self.root_depth - (self.todo.len() - 1) as u32;
115
-
let next_depth = current_depth.checked_sub(1).ok_or(MstError::DepthUnderflow)?;
116
-
if let Some(d) = node.depth {
117
-
if d != next_depth {
118
-
return Err(WalkError::MstError(MstError::WrongDepth {
119
-
depth: d,
120
-
expected: next_depth,
121
-
}));
122
-
}
103
+
let next_depth = current_depth
104
+
.checked_sub(1)
105
+
.ok_or(MstError::DepthUnderflow)?;
106
+
if let Some(d) = node.depth
107
+
&& d != next_depth
108
+
{
109
+
return Err(WalkError::MstError(MstError::WrongDepth {
110
+
depth: d,
111
+
expected: next_depth,
112
+
}));
123
113
}
124
114
125
115
log::trace!("node into depth {next_depth}");
+1
-5
tests/mst-depth.rs
+1
-5
tests/mst-depth.rs
···
205
205
#[test]
206
206
fn test_ietf_example_keys() {
207
207
// https://atproto.com/specs/repository#mst-structure
208
-
for (key, expected) in [
209
-
("key1", 0),
210
-
("key7", 1),
211
-
("key515", 4),
212
-
] {
208
+
for (key, expected) in [("key1", 0), ("key7", 1), ("key515", 4)] {
213
209
let computed = atproto_mst_depth(key);
214
210
assert_eq!(computed, expected);
215
211
}