@opentelemetry/propagator-aws-xray-lambda
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OpenTelemetry AWS Xray propagator provides context propagation for systems that are using AWS X-Ray format.
47 lines • 2.03 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { isSpanContextValid, defaultTextMapGetter, trace, } from '@opentelemetry/api';
import { AWSXRayPropagator, AWSXRAY_TRACE_ID_HEADER, } from '@opentelemetry/propagator-aws-xray';
export const AWSXRAY_TRACE_ID_ENV_VAR = '_X_AMZN_TRACE_ID';
/**
* Implementation of the AWS X-Ray Trace Header propagation protocol with special
* logic for handling Lambda X-ray environment variable.
*
* An example AWS Xray Tracing Header is shown below:
* X-Amzn-Trace-Id: Root=1-5759e988-bd862e3fe1be46a994272793;Parent=53995c3f42cd8ad8;Sampled=1
*/
export class AWSXRayLambdaPropagator {
_awsXrayPropagator = new AWSXRayPropagator();
inject(context, carrier, setter) {
this._awsXrayPropagator.inject(context, carrier, setter);
}
extract(context, carrier, getter) {
const xrayContext = this._awsXrayPropagator.extract(context, carrier, getter);
const spanContext = trace.getSpanContext(context);
if (spanContext && isSpanContextValid(spanContext)) {
return xrayContext;
}
const xrayEnvVar = process.env[AWSXRAY_TRACE_ID_ENV_VAR];
if (!xrayEnvVar) {
return xrayContext;
}
return this._awsXrayPropagator.extract(xrayContext, { [AWSXRAY_TRACE_ID_HEADER]: xrayEnvVar }, defaultTextMapGetter);
}
fields() {
return this._awsXrayPropagator.fields();
}
}
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