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[frontend] - add span links on synthetic requests (open-telemetry#332)
* add span links * add span links to frontend
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72 changes: 42 additions & 30 deletions
72
src/frontend/utils/telemetry/InstrumentationMiddleware.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,39 +1,51 @@ | ||
| import { NextApiHandler } from 'next'; | ||
| import {NextApiHandler} from 'next'; | ||
| import Tracer from './BackendTracer'; | ||
| import { context, propagation, SpanKind, SpanStatusCode, Exception } from '@opentelemetry/api'; | ||
| import { SemanticAttributes } from '@opentelemetry/semantic-conventions'; | ||
| import {context, Exception, propagation, SpanKind, SpanStatusCode, trace} from '@opentelemetry/api'; | ||
| import {SemanticAttributes} from '@opentelemetry/semantic-conventions'; | ||
| import {Span} from '@opentelemetry/sdk-trace-base'; | ||
|
|
||
| const InstrumentationMiddleware = (handler: NextApiHandler): NextApiHandler => { | ||
| const wrapper: NextApiHandler = async (request, response) => { | ||
| const { headers, method, url = '', httpVersion } = request; | ||
| const [target] = url.split('?'); | ||
| return async (request, response) => { | ||
| const {headers, method, url = '', httpVersion} = request; | ||
| const [target] = url.split('?'); | ||
|
|
||
| const parentContext = propagation.extract(context.active(), headers); | ||
| const span = await Tracer.createSpanFromContext(`API HTTP ${method}`, parentContext, { kind: SpanKind.SERVER }); | ||
| let span; | ||
| const baggage = propagation.getBaggage(context.active()); | ||
| if (baggage?.getEntry("synthetic_request")?.value == "true") { | ||
| // if synthetic_request baggage is set, create a new trace linked to the span in context | ||
| // this span will look similar to the auto-instrumented HTTP span | ||
| const syntheticSpan = trace.getSpan(context.active()) as Span; | ||
| span = Tracer.getTracer().startSpan(`HTTP ${method}`, { | ||
| root: true, | ||
| kind: SpanKind.SERVER, | ||
| links: [{context: syntheticSpan.spanContext()}], | ||
| attributes: { | ||
| "app.synthetic_request": true, | ||
| [SemanticAttributes.HTTP_TARGET]: target, | ||
| [SemanticAttributes.HTTP_STATUS_CODE]: response.statusCode, | ||
| [SemanticAttributes.HTTP_ROUTE]: url, | ||
| [SemanticAttributes.HTTP_METHOD]: method, | ||
| [SemanticAttributes.HTTP_USER_AGENT]: headers['user-agent'] || '', | ||
| [SemanticAttributes.HTTP_URL]: `${headers.host}${url}`, | ||
| [SemanticAttributes.HTTP_FLAVOR]: httpVersion, | ||
| } | ||
| }); | ||
|
|
||
| try { | ||
| await Tracer.runWithSpan(span, async () => handler(request, response)); | ||
| } catch (error) { | ||
| span.recordException(error as Exception); | ||
| span.setStatus({ code: SpanStatusCode.ERROR }); | ||
| } else { | ||
| // continue current trace/span | ||
| span = trace.getSpan(context.active()) as Span; | ||
| } | ||
|
|
||
| throw error; | ||
| } finally { | ||
| span.setAttributes({ | ||
| [SemanticAttributes.HTTP_TARGET]: target, | ||
| [SemanticAttributes.HTTP_STATUS_CODE]: response.statusCode, | ||
| [SemanticAttributes.HTTP_ROUTE]: url, | ||
| [SemanticAttributes.HTTP_METHOD]: method, | ||
| [SemanticAttributes.HTTP_USER_AGENT]: headers['user-agent'] || '', | ||
| [SemanticAttributes.HTTP_URL]: `${headers.host}${url}`, | ||
| [SemanticAttributes.HTTP_FLAVOR]: httpVersion, | ||
| }); | ||
|
|
||
| span.end(); | ||
| } | ||
| }; | ||
|
|
||
| return wrapper; | ||
| try { | ||
| await Tracer.runWithSpan(span, async () => handler(request, response)); | ||
| } catch (error) { | ||
| span.recordException(error as Exception); | ||
| span.setStatus({code: SpanStatusCode.ERROR}); | ||
| throw error; | ||
| } finally { | ||
| span.end(); | ||
| } | ||
| }; | ||
| }; | ||
|
|
||
| export default InstrumentationMiddleware; |