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fix(propagator-jaeger):extract 1 digit traceFlag(0) return 1 #2906

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merged 7 commits into from
Apr 24, 2022
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fix(propagator-jaeger):extract 1 digit traceFlag(0) return 1 #2906

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377786b
fix(propagator-jaeger):extract 1 digit traceFlag(0) return 1
shmilyoo Apr 19, 2022
fbdf59a
update CHANGELOG
shmilyoo Apr 20, 2022
3224267
fix quota
shmilyoo Apr 20, 2022
080b958
Merge branch 'main' into jaeger-extract-traceFlag
shmilyoo Apr 20, 2022
9003d04
Merge branch 'main' into jaeger-extract-traceFlag
shmilyoo Apr 21, 2022
edddbfc
Parse jaeger flags with radix 16
dyladan Apr 21, 2022
4a7ca04
Merge branch 'main' into jaeger-extract-traceFlag
legendecas Apr 24, 2022
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2 changes: 1 addition & 1 deletion packages/opentelemetry-propagator-jaeger/src/JaegerPropagator.ts
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Expand Up @@ -145,7 +145,7 @@ function deserializeSpanContext(serializedString: string): SpanContext | null {

const traceId = _traceId.padStart(32, '0');
const spanId = _spanId.padStart(16, '0');
const traceFlags = flags.match(/^[0-9a-f]{2}$/i) ? parseInt(flags) & 1 : 1;
const traceFlags = flags.match(/^[0-9a-f]{1,2}$/i) ? parseInt(flags) & 1 : 1;
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return { traceId, spanId, isRemote: true, traceFlags };
}
17 changes: 16 additions & 1 deletion packages/opentelemetry-propagator-jaeger/test/JaegerPropagator.test.ts
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Expand Up @@ -159,7 +159,7 @@ describe('JaegerPropagator', () => {
});
});

it('should extract context of a sampled span from carrier with 1 bit flag', () => {
it('should extract context of a sampled span from carrier with 1 bit flag(1)', () => {
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nit: What does it mean "1 bit flag"? Should it say "1 hex digit flag" or "1 character flag"?

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Yes, the original test description string is a bit ambiguous.
I think it would be more accurate to use "a single digit character" to describe this, right?

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I think it is "with flag 1 set" and 1 is just the example. Could easily have been 3

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Is there anything else I can do?
There are very few flag bits that can cause problems in production

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Suggested change
it('should extract context of a sampled span from carrier with 1 bit flag(1)', () => {
it('should extract context of a sampled span from carrier with sampled bit (bit 1) set', () => {

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Actually, I think the essence of the test is to check that the flags work when encoded with a single hex character (the thing this PR fixes).
The previous test ("should extract context of a sampled span from carrier") covers the case where flags are 2 digits.

I am good with any name, it's really a nit, don't want to block anything.
If you change the name, please do it also for the other (new) test as well.

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Agree
This is just a description issue, and any developer who sees this test case will not misunderstand it.
We need to solve the problem that the traceFlag length can be 1 and 2 because of the standard definition and compatibility.
In fact, there are four possible values, 0/00/01/1. If some value such as 02 or 2 appear, it is not the library's problem, but the developer's problem who generated the trace header

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Not sure I understand.
The PR is great, I only suggested improving the test name as it is currently not very clear.
If you want to do it - amazing. If not, let's merge it as is :)

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let's merge it as is :)

carrier[UBER_TRACE_ID_HEADER] =
'9c41e35aeb6d1272:45fd2a9709dadcf1:a13699e3fb724f40:1';
const extractedSpanContext = trace.getSpanContext(
Expand All @@ -174,6 +174,21 @@ describe('JaegerPropagator', () => {
});
});

it("should extract context of a sampled span from carrier with 1 bit flag(0)", () => {
carrier[UBER_TRACE_ID_HEADER] =
"9c41e35aeb6d1272:45fd2a9709dadcf1:a13699e3fb724f40:0";
const extractedSpanContext = trace.getSpanContext(
jaegerPropagator.extract(ROOT_CONTEXT, carrier, defaultTextMapGetter)
);

assert.deepStrictEqual(extractedSpanContext, {
spanId: "45fd2a9709dadcf1",
traceId: "00000000000000009c41e35aeb6d1272",
isRemote: true,
traceFlags: TraceFlags.NONE,
});
});

it('should extract context of a sampled span from UTF-8 encoded carrier', () => {
carrier[UBER_TRACE_ID_HEADER] =
'ac1f3dc3c2c0b06e%3A5ac292c4a11a163e%3Ac086aaa825821068%3A1';
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