Refuse content Supermemory would alter, and add a live contract lane - #81
Refuse content Supermemory would alter, and add a live contract lane#81YellowSnnowmann wants to merge 3 commits into
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Every adapter test in this crate runs against a double written from the same documentation the adapter was. That agreement is worth having, but it cannot catch a service whose behaviour differs from its documentation: when that happens the adapter and the double are wrong together and the suite stays green. Add an env-gated target that runs the full provider contract against a real hosted endpoint. It skips unless both the URL and the key are set, so the default `cargo test` stays offline, deterministic, and independent of a vendor's uptime.
Supermemory removes two characters from stored content server-side, so a record containing either reads back shorter than it was written. Measured against the live API rather than inferred: POST /v4/memories echoes the stored value in its own 201, and the echo is missing them. The conformance suite's round-trip case fails there, and it is right to. MemoryCore::store promises that what is read back equals what was stored. A driver may refuse a shape outright, but may not accept one and hand back another, so refuse with Invalid instead of storing a value the service will rewrite. The check precedes the request because the service accepts and alters in the same breath, leaving no later point at which the adapter could object. The refusal is no wider than the defect. Every other C0 control, plus DEL, NEL, ZWSP, BOM and U+2028, survives the live service unchanged, and a test pins that so the predicate cannot quietly grow. It is scoped to content because identity travels in metadata, which is not sanitised — keys and namespaces round-trip both characters intact, and a test pins that too, since widening the refusal there should have to re-measure first. Fixes tinyhumansai#80
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📝 WalkthroughWalkthroughThe Supermemory adapter now rejects NUL and replacement characters before requests. Tests cover error handling, accepted characters, and metadata identity. A credential-gated integration test runs the provider contract against a live Supermemory service. README.md documents both behaviors. ChangesSupermemory contract handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change converts silent content rewriting into an explicit refusal, but the PR is not yet merge-ready because the live-test target suppresses an expect lint across the whole target and refusal errors can emit raw control characters from identity fields into logs or terminals. These are bounded fixes that should be addressed before merge. Suggested reviewers: Poem
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In `@crates/tinymemory-remote/src/supermemory_test.rs`:
- Around line 468-488: Extend
identity_carrying_the_same_characters_is_not_refused with a separate U+FFFD
namespace-and-key case, store ordinary content under that identity, then call
get with the same values and assert the record is retrieved.
In `@crates/tinymemory-remote/src/supermemory.rs`:
- Around line 411-419: Update the Invalid error construction in the
dropped_content_character handling to render entry.namespace and entry.key using
escaped/debug formatting rather than raw interpolation; add a test covering
invalid content with a control character in either identity field and verify the
refusal message contains no raw control character.
In `@crates/tinymemory-remote/tests/live_remote_engines.rs`:
- Line 25: Remove the target-wide clippy::expect_used allowance from
live_remote_engines.rs, then update the affected test to return a Result and
propagate the client-construction failure instead of calling expect.
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README.mdcrates/tinymemory-remote/src/supermemory.rscrates/tinymemory-remote/src/supermemory_test.rscrates/tinymemory-remote/tests/live_remote_engines.rs
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Three review findings, all of them right. The refusal interpolated the namespace and key as raw text. Metadata is not sanitised, so an identity may itself hold a NUL and be stored quite happily — which means a refusal could emit the exact character the naming exists to keep out of logs. Debug-escape both, and pin it with a test that combines content the service would alter with an identity that carries a control character. The live target opened with a blanket clippy::expect_used allowance covering everything in it. Return a Result and propagate the client construction instead, so the guardrail stays where it was. The identity test exercised only U+0000, while the claim it pins covers both characters. Run it over both.
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Fixes #80.
What was wrong
Supermemory removes
U+0000andU+FFFDfrom content server-side. A record containing either reads back shorter than it was written, so the conformance suite's round-trip case fails against the live service — correctly, sinceMemoryCore::storepromises the content read back equals the content stored.Measured, not inferred:
POST /v4/memoriesechoes the stored value in its own 201, and the echo is missing them.What changed
The adapter refuses that content with
MemoryError::Invalidinstead of storing a value the service will rewrite. The contract allows a driver to refuse a shape outright; what it forbids is accepting one and handing back another. The check runs before the request, because the service accepts and alters in the same breath — there is no later point at which the adapter could still object.Scope, and why it is this narrow
Both bounds are measured against the live API, and each has a test pinning it so it cannot drift:
Only these two characters. Every other C0 control, plus DEL, NEL, ZWSP, BOM and U+2028, survives the service unchanged. A refusal widened to "control characters" would reject content Supermemory stores perfectly well, and the conformance suite would still pass while the driver quietly became less useful.
Only
content. Identity travels inmetadata, which is not sanitised —tinymemory_keyandtinymemory_namespaceround-trip both characters intact. That is the difference between mangled content and something worse: had metadata been sanitised too, a re-store would stop matching its own record and duplicate it instead. Widening the refusal there should have to re-measure first, so a test asserts identity is still accepted.The lane that catches this class
Every adapter test here runs against a double written from the same documentation the adapter was. That agreement cannot catch a service that behaves differently from its documentation — when that happens the adapter and the double are wrong together and the suite stays green. #80 is exactly that shape.
The first commit adds an env-gated target running the full provider contract against a real endpoint, skipped unless both the URL and key are set, so the default
cargo teststays offline and deterministic.It is not a vacuous guard — verified by reverting only the adapter change and re-running it live:
Behaviour change
Yes. A
storethat previously succeeded and silently lost a character now returnsMemoryError::Invalid. That is the point — silent loss becomes a refusal the caller can act on — but callers holding either character must strip or replace it first.U+FFFDin particular arrives in any text that has been through a lossy decode. Documented in the README.The error names the character as
U+0000rather than reproducing it: a raw NUL in an error string travels into logs, terminals and shells that render it as nothing, turning a precise refusal into one that appears to name no character at all.Validation
All four contract commands, run locally:
Plus the live suite against
https://api.supermemory.ai, both before and after the fix, as above.Not addressed
Whether Mem0 and Cognee have their own equivalents. The lane is built for all three, but only Supermemory credentials were to hand — the other two remain unverified against live services rather than known-good.
Summary by CodeRabbit
Bug Fixes
Documentation