feat(otel-nestjs-instrumentation): extract shared startOtelInstrumentationIfAbsent function - #9
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…ationIfAbsent function - Create src/start-otel-instrumentation-if-absent.ts mirroring the newrelic-nestjs-instrumentation pattern (startNewRelicTransactionIfAbsent) - Update OtelContextGuard to delegate to the shared function instead of inline span-check logic - Update OtelInterceptor to call startOtelInstrumentationIfAbsent as a fallback for RPC contexts where no HTTP guard has run - Export from src/index.ts and internal/index.ts - Update all affected tests (guard, interceptor, integration) to match the new architecture
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Summary
Mirrors the
newrelic-nestjs-instrumentationpattern by extracting a sharedstartOtelInstrumentationIfAbsentfunction that bothOtelContextGuardandOtelInterceptordelegate to.Changes
src/start-otel-instrumentation-if-absent.ts— checks for an existing span viaInternalContext.getSpan()before creating a new one, preventing duplicate spansOtelContextGuard— now delegates to the shared function instead of inline span-check logicOtelInterceptor— calls the shared function as a fallback for RPC contexts where no HTTP guard has run (guard-only works for HTTP requests; interceptor is the RPC fallback)src/index.tsandsrc/internal/index.tsWhy this pattern?
The guard only runs for HTTP requests, while the interceptor also handles RPC. Both need to start instrumentation if none exists — a shared function avoids duplication and ensures consistent behavior across request types.
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