feat(effect-sdk): opt-in native Cloudflare tracer for the Workers preset - #731
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Makisuo wants to merge 10 commits into
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feat(effect-sdk): opt-in native Cloudflare tracer for the Workers preset#731Makisuo wants to merge 10 commits into
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Add `tracer: "native"` to `MapleCloudflareSDK.make`. Every sampled Effect span is mirrored onto `tracing.startActiveSpan` from `cloudflare:workers`, so it lands in the same trace as Cloudflare's own fetch/KV/R2/D1 spans and is exported by the Worker's ObservabilityDestination: no in-isolate buffer, no `ctx.waitUntil` flush, no ingest key in the Worker. That also makes it usable from Durable Object and Workflow isolates, where the flush is unreliable. Each mirrored span captures `AsyncLocalStorage.snapshot()` inside its callback, children open inside the parent's snapshot, and the tracer's `context` hook runs every fiber step inside the current span's snapshot, so spans opened after a yield still nest correctly and runtime spans attach under the right Effect span. Cloudflare's `isTraced` cascades into Effect's `sampled`. Cloudflare spans carry only scalar attributes, so a failed exit is recorded as `exception.type` / `exception.message` / `exception.stacktrace` / `error.type` instead of an `exception` event; non-scalar attributes, events and links stay Effect-local. The exit classification shared with the OTLP buffer tracer moves to `shared/span-exit.ts` so both paths agree on what is an error. Logs stay with Workers Logs in this mode (no OTLP logger): their Effect trace ids would never match the Cloudflare trace ids on the exported spans. `cloudflare:workers` and `node:async_hooks` are imported dynamically by a variable specifier and narrowed by type guards; when either API is absent the layer logs one notice and keeps spans Effect-local. The default mode and the api/alerting workers are unchanged.
Main taught the OTLP buffer tracer to treat a SERVER span that answered 5xx as an error (OTEL HTTP semconv). This branch had moved the exit classification into `shared/span-exit.ts`, so the rule lands there as a `ServerError` outcome, the OTLP path emits the same `HttpServerErrorResponse` exception event as main, and the native Cloudflare tracer mirrors it as `exception.type` / `exception.message` / `error.type` attributes.
Three findings main's own CI reports at c0a48f3, none introduced here: - `@maple-dev/effect-sdk` is no longer imported by apps/electric-sync since the Worker telemetry moved to packages/infra; drop the dependency. - `resetAuditDenialCoalescing` was a test-only hook with no caller. - `LanguageLogo.astro` annotated `LOGOS` with an open `Record`, which the no-known-value-widening rule rejects; `satisfies` keeps the exhaustive check over `LanguageId` without widening the binding.
Main added `Telemetry.requestLayer` (a flush when the per-event scope closes). In native mode there is nothing to flush, so `requestLayer` is the native tracer layer itself; the README keeps main's alchemy Workers section ahead of the native-tracing one.
The earlier knip fix dropped `@maple-dev/effect-sdk` from electric-sync while it was unused; main's Worker-bridge test (#771) imports it again, so the merged tree needs the dependency back.
Main stopped relabelling a handler-recorded `exception` event on a 5xx server span with the generic `HttpServerErrorResponse`. The OTLP path keeps that guard inside the shared-outcome structure, and the native Cloudflare tracer applies the same preference: a recorded exception's type and message win over the generic ones.
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe Cloudflare SDK adds experimental native tracing through ChangesCloudflare tracing
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This adds an opt-in native Cloudflare tracing mode while retaining the existing default tracing path. No concrete merge-blocking risk remains in the supplied change context. Sequence Diagram(s)sequenceDiagram
participant EffectTracer
participant NativeTracer
participant CloudflareTracing
participant AsyncLocalStorage
EffectTracer->>NativeTracer: Start Effect span
NativeTracer->>AsyncLocalStorage: Restore parent snapshot
NativeTracer->>CloudflareTracing: startActiveSpan(name)
CloudflareTracing-->>NativeTracer: Return native span handle
EffectTracer->>NativeTracer: End span with exit
NativeTracer->>CloudflareTracing: Set attributes and end handle
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✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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In `@packages/effect-sdk/src/cloudflare/native-tracer.ts`:
- Around line 268-278: Memoize the native tracer host resolution used by
requestLayer so resolveNativeTracerHost and its dynamic imports execute only
once per isolate, and the unavailable-host notice is emitted only once. Apply
the cache around the host effect before it is consumed by the Layer.effect
construction, while preserving the existing makeNativeTracer and
effectLocalTracer behavior.
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packages/effect-sdk/README.mdpackages/effect-sdk/src/cloudflare/index.test.tspackages/effect-sdk/src/cloudflare/index.tspackages/effect-sdk/src/cloudflare/native-tracer.test.tspackages/effect-sdk/src/cloudflare/native-tracer.tspackages/effect-sdk/src/shared/flushable-tracer.tspackages/effect-sdk/src/shared/span-exit.ts
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`makeNativeTracerLayer` ran the host resolution (two dynamic imports and, when absent, the fallback notice) on every layer build. Runtimes that build `requestLayer` per event would repeat that per request. Memoize the resolved tracer with `Effect.cached` at layer construction, so every build shares one resolution and the notice is logged once.
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What
Adds an experimental
tracer: "native"mode to@maple-dev/effect-sdk/cloudflare. Every sampled Effect span is mirrored ontotracing.startActiveSpanfromcloudflare:workers, so it joins the same trace as Cloudflare's auto-instrumented fetch/KV/R2/D1 spans and is exported by the customer's ObservabilityDestination. No in-isolate buffer, noctx.waitUntil(flush), no ingest key in the Worker. The default OTLP mode and the api/alerting workers are unchanged.Why
The OTLP buffer flush is unreliable from Durable Object and Workflow isolates and requires an ingest key in the Worker. Cloudflare's own tracing (compatibility date >= 2026-07-28) can carry the spans out instead.
How
cloudflare/native-tracer.ts: an EffectTracer.makeoverstartActiveSpan. Each mirrored span capturesAsyncLocalStorage.snapshot()inside its callback, children open inside the parent's snapshot, and thecontexthook runs every fiber step inside the current span's snapshot. Cloudflare'sisTracedcascades into Effect'ssampled, so an untraced invocation opens no Cloudflare spans at all.exception.type,exception.message,exception.stacktrace,error.type) since Cloudflare spans have no events. A parallel change teaches the error MV to read those attributes.shared/span-exit.ts: the success / interrupted / ignored / anticipated / failed classification is shared between the OTLP buffer tracer and the native tracer so they cannot disagree. The OTLP tracer's behaviour is unchanged.cloudflare:workersandnode:async_hooksare imported dynamically by a variable specifier and narrowed by type guards (the installed workers-types only knowenterSpan). A missing API fails withNativeTracingUnavailable, which the layer turns into oneEffect.logInfonotice plus Effect-local spans.Reviewer notes
Config.traceroption and the README section are the only public surface changes.Testing
native-tracer.test.ts: a faketracingbacked by a realAsyncLocalStorageasserts parentage across a scheduler hop into a foreign async context, interleaved fibers, attribute forwarding, all five exit classes, theisTracedcascade, dropped names, host resolution failures, and the fallback path.index.test.ts: native mode off Workers builds the layer, makes no fetch calls, resolvesflush, and logs one notice.tsc --noEmit, oxlint and oxfmt clean on the package. tsdown build confirmed the dynamic imports survive unbundled.Need help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.Summary by CodeRabbit
New Features
Bug Fixes