Joseph Doherty
0c6e5b3ace
The gateway emits a ReplayGap sentinel MxEvent at the head of a StreamEvents stream resumed via after_worker_sequence when the requested cursor predates the oldest retained event. Clients previously ignored it, silently mis-treating a lossy resume as continuous. Each client now surfaces the sentinel as a distinct, typed, non-terminal signal (never synthesized, never swallowed) so a consumer can detect the gap and re-snapshot; resume contract is after_worker_sequence = oldest_available_sequence - 1. - .NET: MxEventStreamItem (IsReplayGap/ReplayGap/Event) via new StreamEventItemsAsync + AsStreamItemsAsync extension. Build clean, 87 passed. - Go: EventResult.ReplayGap field + IsReplayGap(); ReplayGap type alias. build/vet/test clean. - Rust: EventItem enum (Event/ReplayGap); EventStream now yields Result<EventItem, Error>; CLI renders REPLAY_GAP line / replayGap JSON. fmt/check/test/clippy clean. - Python: ReplayGap dataclass; stream_events yields pb.MxEvent | ReplayGap. 131 passed. - Shared docs: ClientLibrariesDesign non-goals reframed (reconnect-replay protocol is consumable; auto-reconnect stays a non-goal); CrossLanguageSmokeMatrix resume-gap note. Java client is deferred to the windev batch (no local JRE); CLI-15 stays open until it lands. Claude-Session: https://claude.ai/code/session_01DMXXvNuPekkkrTEyPNxEkW
120 lines
4.3 KiB
Markdown
120 lines
4.3 KiB
Markdown
# Cross-Language Smoke Matrix
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The cross-language smoke matrix defines the documented commands used to compare
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official clients against the same live gateway flow. It is a repository
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validation fixture and command reference; normal unit tests validate the matrix
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shape without connecting to a gateway.
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The matrix lives in
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`clients/proto/fixtures/smoke/cross-language-smoke-matrix.json`.
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## Scope
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The matrix covers the supported client languages:
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- .NET
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- Go
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- Rust
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- Python
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- Java
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Each client entry defines commands for the same required operation sequence:
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1. `open-session`
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2. `register`
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3. `add-item`
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4. `advise`
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5. `stream-events`
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6. `close-session`
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The optional `write` command is documented separately because writing changes
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provider state and should only run when the operator supplies a safe test value.
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When `stream-events` is resumed with an `after_worker_sequence` cursor that
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predates the oldest event still in the gateway's replay ring, the gateway emits a
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single `ReplayGap` sentinel at the head of the stream. Every client surfaces this
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as a distinct, typed, non-terminal signal (see each client README); the resume
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contract is `after_worker_sequence = oldest_available_sequence - 1`. The default
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smoke sequence opens a fresh stream (no cursor) and does not exercise the gap
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path; a resume-with-gap fixture case is tracked separately (TST-24).
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## Integration Gate
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Cross-language smoke execution is opt-in. Runners should skip the matrix unless
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this variable is set:
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```powershell
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$env:MXGATEWAY_INTEGRATION = "1"
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```
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The shared inputs are:
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| Variable | Default | Purpose |
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|----------|---------|---------|
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| `MXGATEWAY_ENDPOINT` | `localhost:5000` | Gateway endpoint used by client CLIs. |
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| `MXGATEWAY_API_KEY` | Empty | API key source for authenticated gateway deployments. |
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| `MXGATEWAY_TEST_ITEM` | `TestChildObject.TestInt` | MXAccess item used by `add-item`. |
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| `MXGATEWAY_TEST_WRITE_VALUE` | Empty | Enables the optional write step when set by a runner. |
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The commands in the matrix use `MXGATEWAY_API_KEY` through each CLI's
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`api-key-env` flag. They must not embed bearer tokens or raw API keys.
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### TLS variant
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The matrix runs over plaintext (`h2c`) by default. A TLS variant exists but stays
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a manual/opt-in run, consistent with the gate above, because it needs the gateway
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started with an HTTPS endpoint (an `https://` `MXGATEWAY_ENDPOINT`) and each CLI
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switched to its TLS flag (`--tls` / `-tls` / `--plaintext=false` /
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`plaintext=False`). The clients are lenient by default and accept the gateway's
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auto-generated self-signed certificate without extra trust setup, except the Rust
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CLI, which is pin-only and needs `--ca-file` or `--require-certificate-validation`
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(and Python uses trust-on-first-use). See
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[Gateway Configuration — Automatic self-signed certificate](./GatewayConfiguration.md#automatic-self-signed-certificate)
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and each client README for the per-client TLS flags.
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## JSON Comparison
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Every command in the matrix requests JSON output. A runner can compare the
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normalized smoke record across languages with these fields:
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- language,
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- operation,
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- session id,
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- server handle,
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- item handle,
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- event count,
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- event family,
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- worker sequence,
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- protocol status,
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- HRESULT,
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- status arrays,
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- close status.
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Failure output must include the client language, endpoint, and redacted auth
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context. Auth context identifies the source, such as `MXGATEWAY_API_KEY`, but
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does not include the secret value.
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## Bundled Smoke Commands
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Each client also exposes a bundled `smoke` command. Those commands are useful
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for quick local checks, but the full cross-language matrix uses explicit
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operation commands because not every bundled smoke command streams events yet.
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The explicit sequence remains the parity baseline for issue-level validation.
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## Validation
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Run the matrix shape tests after changing the smoke matrix:
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```bash
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dotnet test src/ZB.MOM.WW.MxGateway.Tests/ZB.MOM.WW.MxGateway.Tests.csproj --filter FullyQualifiedName~CrossLanguageSmokeMatrixTests
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```
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Live execution remains a separate opt-in step because it depends on a running
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gateway, the installed MXAccess worker path, and provider state.
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## Related Documentation
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- [Gateway Testing](./GatewayTesting.md)
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- [Client Libraries Detailed Design](./ClientLibrariesDesign.md)
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- [Client Proto Generation](./ClientProtoGeneration.md)
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