autotel/dist/tail-sampling-processor.cjs.map

Write Once, Observe Anywhere

{"version":3,"file":"tail-sampling-processor.cjs","names":["AUTOTEL_SAMPLING_TAIL_EVALUATED","AUTOTEL_SAMPLING_TAIL_KEEP"],"sources":["../src/tail-sampling-processor.ts"],"sourcesContent":["/**\n * Tail Sampling Span Processor\n *\n * Filters spans based on the `autotel.sampling.tail.keep` attribute set during execution.\n * This enables adaptive sampling where we decide whether to keep a span AFTER\n * the operation completes, based on criteria like errors, duration, etc.\n *\n * How it works:\n * 1. Decorator creates span optimistically (head sampling returns true)\n * 2. Operation executes and completes\n * 3. Decorator calls shouldKeepTrace() and sets autotel.sampling.tail.keep attribute\n * 4. This processor checks the attribute and drops spans marked as false\n */\n\nimport type {\n  SpanProcessor,\n  ReadableSpan,\n} from '@opentelemetry/sdk-trace-base';\nimport type { Context } from '@opentelemetry/api';\nimport type { Span } from '@opentelemetry/sdk-trace-base';\nimport {\n  AUTOTEL_SAMPLING_TAIL_KEEP,\n  AUTOTEL_SAMPLING_TAIL_EVALUATED,\n} from './sampling';\n\nexport class TailSamplingSpanProcessor implements SpanProcessor {\n  private wrappedProcessor: SpanProcessor;\n\n  constructor(wrappedProcessor: SpanProcessor) {\n    this.wrappedProcessor = wrappedProcessor;\n  }\n\n  onStart(span: Span, parentContext: Context): void {\n    this.wrappedProcessor.onStart(span, parentContext);\n  }\n\n  onEnd(span: ReadableSpan): void {\n    const tailEvaluated = span.attributes[AUTOTEL_SAMPLING_TAIL_EVALUATED];\n    const shouldKeep = span.attributes[AUTOTEL_SAMPLING_TAIL_KEEP];\n\n    if (tailEvaluated === true && shouldKeep === false) {\n      return;\n    }\n\n    this.wrappedProcessor.onEnd(span);\n  }\n\n  forceFlush(): Promise<void> {\n    return this.wrappedProcessor.forceFlush();\n  }\n\n  shutdown(): Promise<void> {\n    return this.wrappedProcessor.shutdown();\n  }\n}\n"],"mappings":";;;;AAyBA,IAAa,4BAAb,MAAgE;CAC9D,AAAQ;CAER,YAAY,kBAAiC;EAC3C,KAAK,mBAAmB;CAC1B;CAEA,QAAQ,MAAY,eAA8B;EAChD,KAAK,iBAAiB,QAAQ,MAAM,aAAa;CACnD;CAEA,MAAM,MAA0B;EAC9B,MAAM,gBAAgB,KAAK,WAAWA;EACtC,MAAM,aAAa,KAAK,WAAWC;EAEnC,IAAI,kBAAkB,QAAQ,eAAe,OAC3C;EAGF,KAAK,iBAAiB,MAAM,IAAI;CAClC;CAEA,aAA4B;EAC1B,OAAO,KAAK,iBAAiB,WAAW;CAC1C;CAEA,WAA0B;EACxB,OAAO,KAAK,iBAAiB,SAAS;CACxC;AACF"}