weavatrix-scan 0.4.4

Deterministic, safe repository scanner for code intelligence
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

#[allow(dead_code)]
#[path = "support/mod.rs"]
mod support;

use std::panic::{AssertUnwindSafe, catch_unwind};
use std::sync::{
    Arc,
    atomic::{AtomicBool, AtomicUsize, Ordering},
};
use weavatrix_scan::{ParallelWalker, WalkControl, WalkEvent};

#[test]
fn nested_parallel_walk_from_worker_callback_falls_back_without_starvation() {
    let fixture = support::Fixture::new("scan-runtime-nested");
    for directory in 0..32 {
        fixture.write(
            &format!("branch-{directory:02}/file.rs"),
            "fn nested() {}\n",
        );
    }
    let root = fixture.root.clone();
    let started = Arc::new(AtomicBool::new(false));
    let nested_entries = Arc::new(AtomicUsize::new(0));
    let callback_started = Arc::clone(&started);
    let callback_entries = Arc::clone(&nested_entries);
    let report = ParallelWalker::new(&fixture.root)
        .with_parallelism(4)
        .visit(move |event| {
            if matches!(event, WalkEvent::Entry(entry) if entry.depth() > 0)
                && !callback_started.swap(true, Ordering::AcqRel)
            {
                let report = ParallelWalker::new(&root)
                    .with_parallelism(4)
                    .walk()
                    .expect("nested traversal completes");
                callback_entries.store(report.entries.len(), Ordering::Release);
            }
            WalkControl::Continue
        })
        .unwrap();

    assert!(report.visited > 32);
    assert!(started.load(Ordering::Acquire));
    assert_eq!(
        nested_entries.load(Ordering::Acquire),
        usize::try_from(report.visited).unwrap()
    );
}

#[test]
fn worker_callback_panic_propagates_and_pool_remains_usable() {
    let fixture = support::Fixture::new("scan-runtime-panic");
    fixture.write("branch/file.rs", "fn panic_probe() {}\n");

    let panic = catch_unwind(AssertUnwindSafe(|| {
        ParallelWalker::new(&fixture.root)
            .with_parallelism(4)
            .visit(|event| {
                if matches!(event, WalkEvent::Entry(entry) if entry.depth() > 0) {
                    panic!("worker visitor panic");
                }
                WalkControl::Continue
            })
            .unwrap();
    }));
    assert!(panic.is_err());

    let recovered = ParallelWalker::new(&fixture.root)
        .with_parallelism(4)
        .walk()
        .unwrap();
    assert!(
        recovered
            .entries
            .iter()
            .any(weavatrix_scan::WalkEntry::is_file)
    );
}

#[test]
fn nested_parallel_visit_uses_serial_fallback_controls() {
    let fixture = support::Fixture::new("scan-runtime-nested-visit");
    fixture.write("branch-00/skipped.rs", "fn skipped() {}\n");
    fixture.write("branch-01/stop.rs", "fn stop() {}\n");
    let root = fixture.root.clone();
    let started = Arc::new(AtomicBool::new(false));
    let skipped_file_seen = Arc::new(AtomicBool::new(false));
    let nested_quit = Arc::new(AtomicBool::new(false));

    let outer = ParallelWalker::new(&fixture.root)
        .with_parallelism(4)
        .visit({
            let started = Arc::clone(&started);
            let skipped_file_seen = Arc::clone(&skipped_file_seen);
            let nested_quit = Arc::clone(&nested_quit);
            move |event| {
                if matches!(event, WalkEvent::Entry(entry) if entry.depth() > 0)
                    && !started.swap(true, Ordering::AcqRel)
                {
                    let skipped_file_seen = Arc::clone(&skipped_file_seen);
                    let nested = ParallelWalker::new(&root)
                        .with_parallelism(4)
                        .visit(move |nested_event| match nested_event {
                            WalkEvent::Entry(entry)
                                if entry.relative_path() == std::path::Path::new("branch-00") =>
                            {
                                WalkControl::Skip
                            }
                            WalkEvent::Entry(entry)
                                if entry.relative_path()
                                    == std::path::Path::new("branch-00/skipped.rs") =>
                            {
                                skipped_file_seen.store(true, Ordering::Release);
                                WalkControl::Continue
                            }
                            WalkEvent::Entry(entry) if entry.is_file() => WalkControl::Quit,
                            WalkEvent::Entry(_) | WalkEvent::Error(_) => WalkControl::Continue,
                        })
                        .unwrap();
                    nested_quit.store(nested.quit, Ordering::Release);
                }
                WalkControl::Continue
            }
        })
        .unwrap();

    assert!(outer.visited > 0);
    assert!(started.load(Ordering::Acquire));
    assert!(nested_quit.load(Ordering::Acquire));
    assert!(!skipped_file_seen.load(Ordering::Acquire));
}