- compressBlob now asserts its own output declares a content size, instead of
trusting that the only way to lose the field is the one #86 found. An encoder
upgrade that finds another way would otherwise republish the same undecodable
blob in silence, and a blob is skipped by every later emit once written.
- inspectBlob asserts the frame whenever one is present, rather than only when
the payload is non-empty.
- dirSink stats instead of reading when not verifying. Reading every existing
blob back on the default path was a plain regression, and it contradicted the
documented promise that verifying is a repair pass, not the default.
- The manifest sha1 is now checked as hex before it is interpolated into a URL
path, rather than only measured.
- One blobKey rule for where a blob lives, replacing three copies of the
fanout-path expression.
- Renamed frameSizeThreshold to oneByteContentSizeCeiling, which says whose
threshold it is.
- The read-back in zoneSink reads the storage API on purpose; said so, and
corrected a comment that claimed a failed read-back re-uploads when it
aborts.
- Tests derive their expected blob counts from the run instead of hard-coding
fixture arithmetic, and the size-mismatch category has a test.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
These two land together on purpose. Fixing the encoder alone changes nothing
for the blobs already in the zone, because emit skips whatever is already
present.
#86 — klauspost/compress omits the zstd Frame_Content_Size field for inputs
under 256 bytes, which the format permits. Reference libzstd never does, so the
NWN client — which sizes its output buffer from ZSTD_getFrameContentSize and has
therefore never met a frame without one — rejected roughly 6% of our blobs
outright. Any single one stops a sync dead, so no client could complete a sync
of the live manifest.
No encoder option changes this, so emit re-headers the affected frames into the
shape libzstd itself emits: Single_Segment_flag set, Window_Descriptor dropped,
and the freed byte spent on a one-byte Frame_Content_Size. Same length in, same
length out. Verified against the zstd CLI end to end: a real emitted 230-byte
blob now reports its decompressed size where it previously reported none.
emitter_version goes to 2, so assemble refuses to merge an index written by the
encoder that omitted the field.
#85 — a published blob was verified by exactly one thing, a player's client, at
download time. `nwsync verify <manifest-sha1>` now reads a manifest and its
blobs back through the public pull zone with no credential, decompresses and
hashes every one, and reports missing / malformed framing / size mismatch / hash
mismatch per blob. `--sample N` makes a routine check cheap against a manifest
that is ~69,000 blobs and 15 GB. `emit --verify` applies the same check where
emit would otherwise trust presence, and replaces a stored blob that is not what
its name claims — which is what makes the #86 blobs repairable.
Both new checks assert the frame property, not just a round trip. Round-tripping
cannot see this class of fault: both the zstd CLI and Go's decoder stream such a
frame happily, being more capable decoders than the client's, which is how the
defect reached production and survived an audit.
Refs #54, #55, #59, #75, sow-platform#79.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
archvillainetteandClaude Opus 5