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Conform zipkin traceId, spanId, parentId specs #604

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@praxist praxist commented Jul 22, 2021

Using v1 API defined in https://github.com/openzipkin/zipkin-api/blob/7692ca7be4dc3be9225db550d60c4d30e6e9ec59/zipkin-api.yaml

traceId to 32 character lowercase hex string
spanId to 16 character lowercase hex string
parentId to be absent for root span

Currently required changes to prove out a grafana-agent + tempo tracing architecture.

@praxist praxist requested a review from a team as a code owner July 22, 2021 01:46
Using v1 API defined in https://github.com/openzipkin/zipkin-api/blob/7692ca7be4dc3be9225db550d60c4d30e6e9ec59/zipkin-api.yaml

traceId to 32 character lowercase hex string
spanId to 16 character lowercase hex string
parentId to be absent for root span
@@ -124,8 +124,9 @@ def new(cls) -> "TraceInfo":
with any upstream requests.

"""
trace_id = str(random.getrandbits(64))
return cls(trace_id=trace_id, parent_id=None, span_id=trace_id, sampled=None, flags=None)
trace_id = "{0:0{1}x}".format(random.getrandbits(128), 32)
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padded string with leading 0's to reach 32 characters - necessary in case hex string comes up short.

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Suggested change
trace_id = "{0:0{1}x}".format(random.getrandbits(128), 32)
trace_id = f"{random.getrandbits(128):032x}"

Parameterizing the 32 makes it quite hard to read the format string, and using f-strings makes this a little easier to understand as well.

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fishy commented Jul 22, 2021

This needs to be opt-in and default to false, as the older version of baseplate.py/go library will reject hex ids.

We already implemented the opt-in in .go, see the comment there: https://pkg.go.dev/github.com/reddit/baseplate.go/tracing#TracerConfig.UseUUID

@spladug spladug self-requested a review July 22, 2021 16:48
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Thanks! It sounds like we're going ahead with the hex format so this looks good but as @fishy pointed out we'll need this to be opt-in for now.

@@ -124,8 +124,9 @@ def new(cls) -> "TraceInfo":
with any upstream requests.

"""
trace_id = str(random.getrandbits(64))
return cls(trace_id=trace_id, parent_id=None, span_id=trace_id, sampled=None, flags=None)
trace_id = "{0:0{1}x}".format(random.getrandbits(128), 32)
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Suggested change
trace_id = "{0:0{1}x}".format(random.getrandbits(128), 32)
trace_id = f"{random.getrandbits(128):032x}"

Parameterizing the 32 makes it quite hard to read the format string, and using f-strings makes this a little easier to understand as well.

trace_id = str(random.getrandbits(64))
return cls(trace_id=trace_id, parent_id=None, span_id=trace_id, sampled=None, flags=None)
trace_id = "{0:0{1}x}".format(random.getrandbits(128), 32)
span_id = "{0:0{1}x}".format(random.getrandbits(64), 16)
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Suggested change
span_id = "{0:0{1}x}".format(random.getrandbits(64), 16)
span_id = f"{random.getrandbits(64):016x}"

@@ -279,7 +279,9 @@ def _to_span_obj(
"binaryAnnotations": binary_annotations,
}

span["parentId"] = self.span.parent_id or 0
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Hm. This means we don't send a parentId at all if it's undefined. Is that right? No default?

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3 participants