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chore(extension-tracing): start to use opentelemetry
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extensions/tracing/src/interceptors/tracing.interceptor.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| // Copyright IBM Corp. 2019. All Rights Reserved. | ||
| // Node module: @loopback/extension-tracing | ||
| // This file is licensed under the MIT License. | ||
| // License text available at https://opensource.org/licenses/MIT | ||
|
|
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| import {bind, Provider, ValueOrPromise} from '@loopback/core'; | ||
| import {asMiddleware, Middleware, MiddlewareContext} from '@loopback/express'; | ||
| import openTelemetry, {propagation, Tracer} from '@opentelemetry/api'; | ||
| import {JaegerExporter} from '@opentelemetry/exporter-jaeger'; | ||
| import {BasicTracerProvider, SimpleSpanProcessor} from '@opentelemetry/tracing'; | ||
| import debugFactory from 'debug'; | ||
| import {TracingBindings} from '../keys'; | ||
|
|
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| const debug = debugFactory('loopback:tracing'); | ||
|
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| @bind(asMiddleware({group: 'tracing'})) | ||
| export class TracingMiddleware implements Provider<Middleware> { | ||
| private tracer: Tracer; | ||
|
|
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| constructor() { | ||
| const provider = new BasicTracerProvider(); | ||
|
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| // Configure span processor to send spans to the exporter | ||
| const exporter = new JaegerExporter({serviceName: 'basic-service'}); | ||
| provider.addSpanProcessor(new SimpleSpanProcessor(exporter)); | ||
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| /** | ||
| * Initialize the OpenTelemetry APIs to use the BasicTracerProvider bindings. | ||
| * | ||
| * This registers the tracer provider with the OpenTelemetry API as the global | ||
| * tracer provider. This means when you call API methods like | ||
| * `opentelemetry.trace.getTracer`, they will use this tracer provider. If you | ||
| * do not register a global tracer provider, instrumentation which calls these | ||
| * methods will recieve no-op implementations. | ||
| */ | ||
| provider.register(); | ||
| this.tracer = openTelemetry.trace.getTracer('loopback:tracer'); | ||
| } | ||
|
|
||
| value() { | ||
| return this.intercept.bind(this); | ||
| } | ||
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| async intercept<T>(reqCtx: MiddlewareContext, next: () => ValueOrPromise<T>) { | ||
| let reqSpanCtx = propagation.extract( | ||
| FORMAT_HTTP_HEADERS, | ||
| reqCtx.request.headers, | ||
| ); | ||
| debug('Extracted span context: %s', reqSpanCtx); | ||
| let span; | ||
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| if (!reqSpanCtx || !(reqSpanCtx as any).traceId) { | ||
| span = this.tracer.startSpan(reqCtx.targetName); | ||
| reqSpanCtx = span.context(); | ||
| debug('Inject a new span context: %s', reqSpanCtx); | ||
| this.tracer.inject( | ||
| reqSpanCtx, | ||
| FORMAT_HTTP_HEADERS, | ||
| reqCtx.request.headers, | ||
| ); | ||
| } else { | ||
| const parentSpan = reqCtx.getSync(TracingBindings.SPAN, { | ||
| optional: true, | ||
| }); | ||
| span = this.tracer.startSpan(reqCtx.targetName, { | ||
| references: [followsFrom(parentSpan?.context() ?? reqSpanCtx)], | ||
| }); | ||
| if (debug.enabled) debug('A new span is started: %s', span.context()); | ||
| } | ||
| debug('Span context at %s: %s', reqCtx.targetName, reqSpanCtx); | ||
|
|
||
| try { | ||
| reqCtx.bind(TracingBindings.SPAN).to(span); | ||
| return await next(); | ||
| } finally { | ||
| span.finish(); | ||
| if (debug.enabled) debug('The span is finished: %s', span.context()); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| { | ||
| "$schema": "http://json.schemastore.org/tsconfig", | ||
| "extends": "@loopback/build/config/tsconfig.common.json", | ||
| "compilerOptions": { | ||
| "outDir": "dist", | ||
| "rootDir": "src", | ||
| "composite": true | ||
| }, | ||
| "include": [ | ||
| "src" | ||
| ], | ||
| "references": [ | ||
| { | ||
| "path": "../../packages/core/tsconfig.json" | ||
| }, | ||
| { | ||
| "path": "../../packages/express/tsconfig.json" | ||
| }, | ||
| { | ||
| "path": "../../packages/rest/tsconfig.json" | ||
| }, | ||
| { | ||
| "path": "../../packages/testlab/tsconfig.json" | ||
| } | ||
| ] | ||
| } |
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