feat(cache): Record the raw body beside the parsed record and replay through it - #25
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…through it Changes: - cache.raw(kind, key, fetch) stores the body a call fetched under raw-<kind>-<digest>.json; the transport in http.get_json and the plugin runner in calibre_plugin.fetch_plugin go through it. - A parsed record names the raw files its fetch read; a replay runs the fetch through the raw layer only when every named file is present, and serves the parsed record otherwise, so a set recorded before the raw layer existed replays exactly as before and no replay reaches the network. - Record mode always runs the fetch; the raw layer only fetches a body it lacks, so recording over an existing set fills in what is missing, and a failed re-fetch never overwrites a good record. - Tests for the transport round trip, a parser change showing in replay, the parsed fallback, the plugin path, the bad-minute rule and the raw file list; README paragraph. A replay used to serve each source's parsed record, so a change to opf.py or a source parser replayed as before and proved nothing. Measured on the 50-book sample: re-recording with raw bodies and replaying through today's parser gives 89 plugin records an ISBN the old fixtures lacked, because the scheme="ISBN" form was taught to opf.parse after that set was recorded and no replay had ever shown it. Closes #11
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Summary by CodeRabbit
WalkthroughThe replay cache now stores raw source responses beside parsed records. Replay reparses available raw bodies with current code, falls back to parsed records when raw files are absent, and preserves successful records after failed re-recording attempts. ChangesRaw response replay cache
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Source as Source parser
participant Cache as Replay cache
participant Raw as Raw response file
participant Live as HTTP or Calibre fetch
Source->>Cache: request source response
Cache->>Raw: read recorded raw body
Raw-->>Cache: return raw body
Cache-->>Source: reparse current raw response
Cache->>Live: fetch on cache miss
Live-->>Cache: return and store raw body
Merge Risk: 🔵 Low · up to The replay documentation can mislead fixture maintainers about when parser changes take effect and when replay falls back to parsed data. Clarify the condition before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 19.05% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 4 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Changes: - get_json parses the body inside the fetch handed to the raw layer, so a body that is not JSON is retried and never written as a fixture; a replay makes one attempt, since it reads the same file every time. - In replay, a stored body the parser rejects falls back to the parsed record like a missing one. - Tests for the retried body, a parser that asks a new URL, and a rejected stored body. Review found that a 503 page was written to the raw layer before json.loads rejected it, so the retry and every later record run served the bad body from disk, and that a rejected stored body escaped replay as a SourceError after a real pause.
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Inline comments:
In `@README.md`:
- Around line 192-197: Update the recording/replay paragraph in the README so
replay uses current parsers only when every raw file referenced by the record
exists; if any named raw file is missing, it must fall back to the parsed
record. Keep the existing behavior for records without a raw layer and place the
entire paragraph on one physical line.
In `@src/ebook_metamend/sources/calibre_plugin.py`:
- Around line 41-45: Rename the local callback function live to
fetch_from_calibre so its name clearly describes the Calibre metadata retrieval
action, and update the cache.raw call to use the renamed callback.
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README.mdsrc/ebook_metamend/sources/cache.pysrc/ebook_metamend/sources/calibre_plugin.pysrc/ebook_metamend/sources/http.pytests/test_pipeline.py
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… name Changes: - The README paragraph on the raw layer is one physical line and states the every-file condition for replaying through raw bodies. - The plugin runner's callback is named for what it does. Both from the CodeRabbit review of the pull request.
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Changes:
cache.raw(kind, key, fetch): the body a call fetched is stored underraw-<kind>-<digest>.json({kind, key, body});http.get_jsonroutes the transport through it (key: the URL) andcalibre_plugin.fetch_pluginroutes the plugin run through it (key: plugin, title, author). Failures are not stored here; the parsed layer keeps them as before."raw": [...]). In replay,wrapruns the fetch through the raw layer only when every named file is present, and serves the parsed record otherwise. A set recorded before this change has no such list and replays exactly as before; a source that bypassed the raw layer could never reach the network in replay.http.get_jsonletsMissingRawthrough its retry loop untouched.tests/test_pipeline.py; a README paragraph under record and replay.Why. A replay served each source's parsed record, so a change to
opf.pyor a source parser replayed as before and proved nothing (#11). Measured. The 50-book sample was re-recorded live into a copy of the wide set (three passes: one full, two for Open Library after it timed out and was shelved) and replayed through the raw bodies with today's code: HIGH 35, MED 7, LOW 8, the same as the old set. But 89 Kobo and Google records now carry an ISBN the old fixtures lacked:opf.parsewas taught theopf:scheme="ISBN"form in #15 after that set was recorded, and no replay had been able to show it. Eight books in the sample now offer an ISBN gain that the old replay never proposed. The old set (fixtures-wide-ol) still replays to the same 35/7/8 with this branch, unchanged. Suite: 331 passed, ruff clean. The browser build is unaffected: with no cache mode set,raw()is a passthrough.Closes #11