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feat(@opentelemetry-instrumentation-fetch): support reading response body from the hook applyCustomAttributesOnSpan #2497

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merged 2 commits into from
Oct 9, 2021
Merged

feat(@opentelemetry-instrumentation-fetch): support reading response body from the hook applyCustomAttributesOnSpan #2497

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7f90bf4
feat(@opentelemetry-instrumentation-fetch): support reading response …
echoontheway Sep 26, 2021
84a9bfd
Merge branch 'main' into feature/echo_optimizeFetchInstrument
vmarchaud Oct 9, 2021
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3 changes: 2 additions & 1 deletion experimental/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -331,14 +331,15 @@ export class FetchInstrumentation extends InstrumentationBase<
): void {
try {
const resClone = response.clone();
const resClone4Hook = response.clone();
const body = resClone.body;
if (body) {
const reader = body.getReader();
const read = (): void => {
reader.read().then(
({ done }) => {
if (done) {
endSpanOnSuccess(span, response);
endSpanOnSuccess(span, resClone4Hook);
} else {
read();
}
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16 changes: 16 additions & 0 deletions experimental/packages/opentelemetry-instrumentation-fetch/test/fetch.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -683,6 +683,22 @@ describe('fetch', () => {

prepare(url, applyCustomAttributes);
});

it('get response body from callback arguments response', done => {
const applyCustomAttributes: FetchCustomAttributeFunction = async (
span,
request,
response
) => {
if(response instanceof Response ){
const rsp = await response.json();
assert.deepStrictEqual(rsp.args, {});
done();
}
};

prepare(url, applyCustomAttributes);
});
});

describe('when url is ignored', () => {
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