Initial commit: ClawSync v0.1.0
8-crate pure-Rust workspace for revision-aware HDF5 sync. ## Crates - clawhdf5-onion: ClawOnion VFD — page-level versioned HDF5 storage, binary format, writer/reader, branch DAG, GC, snapshots, provenance - clawsync-core: BLAKE3, xxHash3, FastCDC (+ SIMD NEON), zstd/lz4 - clawsync-onion: IBLT sketch, Merkle tree differ, packet differ/merger, ClawSyncManifest, SyncSelector - clawsync-hdf5: dataset-level manifest, differ, patcher, wire payload reconstruction (apply_received_payloads) - clawsync-transport: TCP, QUIC (quinn 0.11/TLS 1.3), SyncPeer abstraction, length-prefixed rkyv wire protocol (21 SyncMessage variants) - clawsync-agent: OnionMemory, SyncScheduler, TcpSyncBackend, PeerCapabilities negotiation - clawsync-fs: CDC-based delta sync for any file type; FsSyncClient/Server, W=16 pipelining, atomic writes - clawsync-cli: push/pull/serve/hdf5-sync/serve-hdf5/sync/serve-fs + all local management commands; --quic on all network commands ## Key features - IBLT pre-flight: O(revision count) vs rsync's O(file size) - W=16 sliding-window push: 13–15x speedup over stop-and-wait at WAN RTT - Dataset-granular HDF5 sync: only modified datasets transferred - CDC delta for any file type: insertion-stable chunk boundaries - Full revision DAG: branch, merge, rollback, export, snapshot, GC - QUIC transport: TLS 1.3, per-message streams via quinn 0.11 ## Tests ~573 passing (default features); ~589 with --features simd-cdc ## Performance (Apple Silicon) - Reconstruct rev=100: 68 µs (target ≤ 1 ms) - BLAKE3 Rayon 1 MB: 10.3 GiB/s (target ≥ 5 GB/s) - GC 500 revisions: 20.6 µs (target ≤ 2 s) - W=16 vs W=1 at 5 ms RTT: 14.8x speedup - No-op pre-flight at 16 MB: 4 ms vs rsync 35 ms (7.8x) Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
This commit is contained in:
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//! Property-based tests for [`VersionedFile`].
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//!
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//! These tests verify that the high-level `VersionedFile` API preserves
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//! reconstruction correctness under arbitrary sequences of interleaved
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//! branch commits, snapshots, and flush+reload cycles.
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//!
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//! ## Key invariant
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//!
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//! For any sequence of `commit_on(branch, new_bytes, ...)` calls, reconstructing
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//! the resulting revision must return exactly `new_bytes` (for the pages that
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//! were written). This is the correctness guarantee of the per-branch diff
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//! baseline (`branch_state` map inside `VersionedFile`).
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//!
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//! ## Fill-byte constraint
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//!
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//! All writes use fill bytes in 1..=255 so that every page always differs from
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//! `h5_base` (a 4 KiB zero buffer). This avoids the documented edge case where
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//! committing bytes equal to `h5_base` on a branch that has ancestors with
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//! different content would silently record an empty diff, making the commit
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//! indistinguishable from a no-op at the page level.
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use clawhdf5_onion::versioned_file::VersionedFile;
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use proptest::prelude::*;
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use tempfile::TempDir;
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// ─────────────────────────────────────────────────────────────────────────────
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// Constants
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// ─────────────────────────────────────────────────────────────────────────────
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const PAGE_SIZE: u32 = 4096;
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// ─────────────────────────────────────────────────────────────────────────────
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// Generators
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// ─────────────────────────────────────────────────────────────────────────────
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/// A single round of operations: optionally create a new branch, then commit
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/// on `branch_idx % current_branch_count` with `fill`.
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#[derive(Debug, Clone)]
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struct Round {
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/// If true, fork a new branch from main before this commit.
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create_branch: bool,
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/// Raw index — clamped to `% len(branches)` during execution.
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branch_idx: usize,
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/// Fill byte for the 4 KiB page. Kept in 1..=255 so the page always
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/// differs from the zero-filled `h5_base`.
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fill: u8,
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}
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fn arb_round() -> impl Strategy<Value = Round> {
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(any::<bool>(), 0usize..8usize, 1u8..=255u8).prop_map(|(create_branch, branch_idx, fill)| {
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Round { create_branch, branch_idx, fill }
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})
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}
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fn arb_rounds(min: usize, max: usize) -> impl Strategy<Value = Vec<Round>> {
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proptest::collection::vec(arb_round(), min..=max)
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}
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// ─────────────────────────────────────────────────────────────────────────────
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// Test helpers
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// ─────────────────────────────────────────────────────────────────────────────
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/// Create a temp dir with a 4 KiB zero base file and a fresh `VersionedFile`.
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fn make_vf() -> (TempDir, std::path::PathBuf, VersionedFile) {
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let dir = TempDir::new().unwrap();
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let h5 = dir.path().join("base.h5");
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std::fs::write(&h5, vec![0u8; PAGE_SIZE as usize]).unwrap();
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let vf = VersionedFile::create(&h5, PAGE_SIZE).unwrap();
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(dir, h5, vf)
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}
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/// Apply `rounds` to `vf`, returning a Vec of `(revision_number, expected_page_bytes)`.
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///
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/// `branches` starts as `["main"]` and grows as new branches are created.
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fn apply_rounds(
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vf: &mut VersionedFile,
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rounds: &[Round],
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) -> Vec<(u64, Vec<u8>)> {
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let mut branches: Vec<String> = vec!["main".to_string()];
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let mut expectations: Vec<(u64, Vec<u8>)> = Vec::new();
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let mut branch_counter: usize = 0;
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for round in rounds {
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// Optionally create a new branch forked from main.
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if round.create_branch {
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let name = format!("b{branch_counter}");
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branch_counter += 1;
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// create_branch may fail if a branch with the same name already exists,
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// which can't happen here since names are unique via the counter.
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vf.onion_mut().create_branch(&name, "main").unwrap();
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branches.push(name);
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}
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let branch_name = &branches[round.branch_idx % branches.len()];
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let branch_opt = if branch_name == "main" {
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None
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} else {
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Some(branch_name.as_str())
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};
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let new_bytes = vec![round.fill; PAGE_SIZE as usize];
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let rev = vf.commit_on(branch_opt, new_bytes.clone(), None).unwrap();
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expectations.push((rev, new_bytes));
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}
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expectations
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}
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/// Verify every `(rev, expected_bytes)` pair: reconstruct the revision from
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/// `vf` and check that page 0 matches `expected_bytes`.
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fn verify_expectations(
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vf: &VersionedFile,
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h5_base: &[u8],
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expectations: &[(u64, Vec<u8>)],
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) -> Result<(), TestCaseError> {
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for (rev, expected) in expectations {
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let actual = vf
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.onion()
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.reconstruct_revision(*rev, h5_base)
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.map_err(|e| TestCaseError::fail(format!("reconstruct_revision({rev}) failed: {e}")))?;
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// Check that the first page matches exactly.
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let page_end = PAGE_SIZE as usize;
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prop_assert_eq!(
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&actual[..page_end],
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expected.as_slice(),
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"revision {}: page 0 mismatch", rev
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);
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}
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Ok(())
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}
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// ─────────────────────────────────────────────────────────────────────────────
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// Property tests
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// ─────────────────────────────────────────────────────────────────────────────
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proptest! {
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#![proptest_config(ProptestConfig {
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cases: 200,
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max_shrink_iters: 100,
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..ProptestConfig::default()
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})]
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/// After any sequence of interleaved commits on multiple branches, every
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/// committed revision reconstructs to the exact bytes that were passed to
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/// `commit_on`.
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///
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/// This is the core invariant of the per-branch diff baseline: even with
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/// arbitrary interleaving of commits across branches, `reconstruct_revision`
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/// always yields back the bytes that were committed.
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#[test]
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fn prop_vf_interleaved_commits_reconstruct_correctly(
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rounds in arb_rounds(1, 16),
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) {
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let (_dir, h5, mut vf) = make_vf();
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let h5_base = std::fs::read(&h5).unwrap();
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let expectations = apply_rounds(&mut vf, &rounds);
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verify_expectations(&vf, &h5_base, &expectations)?;
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}
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/// After commits, flushing the sidecar to disk and reloading it via
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/// `VersionedFile::open` preserves every revision's content.
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///
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/// This checks that the on-disk serialisation + deserialization path is
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/// lossless for the high-level API.
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#[test]
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fn prop_vf_flush_reload_preserves_all_commits(
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rounds in arb_rounds(1, 12),
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) {
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let (_dir, h5, mut vf) = make_vf();
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let h5_base = std::fs::read(&h5).unwrap();
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let expectations = apply_rounds(&mut vf, &rounds);
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// Flush is already called inside commit_on, but call it once more to
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// exercise the explicit flush path.
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vf.onion_mut().flush().unwrap();
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// Reload from disk.
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let reloaded = VersionedFile::open(&h5).unwrap();
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verify_expectations(&reloaded, &h5_base, &expectations)?;
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}
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/// After any commits on main followed by a manual snapshot, the snapshot
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/// revision reconstructs to the same bytes as the pre-snapshot HEAD.
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/// Subsequent commits on main still reconstruct correctly.
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///
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/// This verifies that inserting a snapshot does not corrupt the revision
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/// chain for future commits.
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#[test]
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fn prop_vf_snapshot_does_not_corrupt_reconstruction(
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pre_fills in proptest::collection::vec(1u8..=255u8, 1..=6usize),
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post_fills in proptest::collection::vec(1u8..=255u8, 0..=4usize),
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) {
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let (_dir, h5, mut vf) = make_vf();
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let h5_base = std::fs::read(&h5).unwrap();
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let mut expectations: Vec<(u64, Vec<u8>)> = Vec::new();
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// Pre-snapshot commits on main.
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for &fill in &pre_fills {
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let bytes = vec![fill; PAGE_SIZE as usize];
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let rev = vf.commit_on(None, bytes.clone(), None).unwrap();
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expectations.push((rev, bytes));
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}
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// Snapshot — must reconstruct to the same bytes as the last pre-commit.
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let snap_rev = vf.snapshot(Some("test snapshot")).unwrap();
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let last_expected = expectations.last().unwrap().1.clone();
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let snap_actual = vf.onion().reconstruct_revision(snap_rev, &h5_base).unwrap();
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prop_assert_eq!(
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&snap_actual[..PAGE_SIZE as usize],
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last_expected.as_slice(),
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"snapshot revision {} does not match pre-snapshot HEAD", snap_rev
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);
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// Post-snapshot commits — reconstruction must remain correct.
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for &fill in &post_fills {
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let bytes = vec![fill; PAGE_SIZE as usize];
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let rev = vf.commit_on(None, bytes.clone(), None).unwrap();
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expectations.push((rev, bytes));
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}
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verify_expectations(&vf, &h5_base, &expectations)?;
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}
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}
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