autotel/dist/filtering-span-processor.js

Write Once, Observe Anywhere

//#region src/filtering-span-processor.ts
/**
* Span processor that filters spans based on a predicate function.
*
* The filter is applied on onEnd() when the span has complete data including:
* - All attributes
* - Status code and message
* - Duration
* - Events and links
* - Instrumentation scope (useful for filtering by library)
*
* onStart() passes through unchanged to ensure child spans can still be created.
*
* Error handling: If the filter predicate throws, the span is forwarded (fail-open).
*/
var FilteringSpanProcessor = class {
	wrappedProcessor;
	filter;
	constructor(wrappedProcessor, options) {
		this.wrappedProcessor = wrappedProcessor;
		this.filter = options.filter;
	}
	/**
	* Pass through onStart - we need spans to start so child spans work
	*/
	onStart(span, parentContext) {
		this.wrappedProcessor.onStart(span, parentContext);
	}
	/**
	* Apply filter predicate on span end
	* If filter returns false, span is dropped (not forwarded)
	*/
	onEnd(span) {
		try {
			if (this.filter(span)) this.wrappedProcessor.onEnd(span);
		} catch {
			this.wrappedProcessor.onEnd(span);
		}
	}
	forceFlush() {
		return this.wrappedProcessor.forceFlush();
	}
	shutdown() {
		return this.wrappedProcessor.shutdown();
	}
};

//#endregion
export { FilteringSpanProcessor };
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