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StackDriver Propagator: Make the google header configurable #818

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StackDriver Propagator: Make the google header configurable #818

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13 changes: 11 additions & 2 deletions packages/opencensus-propagation-stackdriver/src/stackdriver-format.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -42,13 +42,22 @@ const TRACE_TRUE = 0x1;

/** Propagates span context through Stackdriver Format propagation. */
export class StackdriverFormat implements Propagation {
headerName: string;

constructor(config?: { headerName?: string }) {
if (config && config.headerName) {
this.headerName = config.headerName;
} else {
this.headerName = TRACE_CONTEXT_HEADER_NAME;
}
}
/**
* Gets the span context from a request headers. If there is no span context
* in the headers, null is returned.
* @param getter
*/
extract(getter: HeaderGetter): SpanContext | null {
const traceContextHeader = getter.getHeader(TRACE_CONTEXT_HEADER_NAME);
const traceContextHeader = getter.getHeader(this.headerName);
if (typeof traceContextHeader !== 'string') {
return null;
}
Expand Down Expand Up @@ -83,7 +92,7 @@ export class StackdriverFormat implements Propagation {
header += `;o=${spanContext.options}`;
}

setter.setHeader(TRACE_CONTEXT_HEADER_NAME, header);
setter.setHeader(this.headerName, header);
}

/** Generate SpanContexts */
Expand Down