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[tracer] Serialize span links in meta #6656

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7153473
serialize span links in meta under `Span[meta][_dd.span_links]`
nhulston Feb 11, 2025
fb8fb7f
always include trace flags in span links, even if trace flags is unset
nhulston Feb 11, 2025
19836d5
test span links are serialized in meta
nhulston Feb 11, 2025
256e928
test that trace flags are always serialized in span link
nhulston Feb 11, 2025
0ede678
remove inaccurate comment
nhulston Feb 11, 2025
ddabef2
update snapshots
nhulston Feb 12, 2025
ed59656
add `_dd.span_links` to optional tags in tests
nhulston Feb 12, 2025
2ccd4f5
add span link scrubbers
nhulston Feb 12, 2025
e82b13b
update snapshots
nhulston Feb 12, 2025
3235c7f
update snapshots
nhulston Feb 12, 2025
88e7a86
update snapshots
nhulston Feb 12, 2025
8f2b896
update snapshots
nhulston Feb 13, 2025
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83 changes: 70 additions & 13 deletions tracer/src/Datadog.Trace/Agent/MessagePack/SpanMessagePackFormatter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,13 +7,13 @@
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using Datadog.Trace.AppSec;
using Datadog.Trace.ExtensionMethods;
using Datadog.Trace.Processors;
using Datadog.Trace.Propagators;
using Datadog.Trace.Tagging;
using Datadog.Trace.Util;
using Datadog.Trace.Vendors.MessagePack;
using Datadog.Trace.Vendors.MessagePack.Formatters;
using Datadog.Trace.Vendors.Newtonsoft.Json;

namespace Datadog.Trace.Agent.MessagePack
{
Expand Down Expand Up @@ -47,6 +47,7 @@ internal class SpanMessagePackFormatter : IMessagePackFormatter<TraceChunkModel>
private readonly byte[] _traceStateBytes = StringEncoding.UTF8.GetBytes("tracestate");
private readonly byte[] _traceFlagBytes = StringEncoding.UTF8.GetBytes("flags");
private readonly byte[] _attributesBytes = StringEncoding.UTF8.GetBytes("attributes");
private readonly byte[] _ddSpanLinksBytes = StringEncoding.UTF8.GetBytes("_dd.span_links");

// string tags
private readonly byte[] _metaBytes = StringEncoding.UTF8.GetBytes("meta");
Expand Down Expand Up @@ -253,19 +254,14 @@ private int WriteSpanLink(ref byte[] bytes, int offset, in SpanModel spanModel)
<= 0 => 1u << 31, // drop
};

var len = 3;
var len = 4;

// check to serialize tracestate
if (context.IsRemote)
{
len++;
}

if (traceFlags > 0)
{
len++;
}

var hasAttributes = spanLink.Attributes is { Count: > 0 };
if (hasAttributes)
{
Expand All @@ -282,6 +278,10 @@ private int WriteSpanLink(ref byte[] bytes, int offset, in SpanModel spanModel)
// spanid
offset += MessagePackBinary.WriteStringBytes(ref bytes, offset, _spanIdBytes);
offset += MessagePackBinary.WriteUInt64(ref bytes, offset, context.SpanId);
// flags
offset += MessagePackBinary.WriteStringBytes(ref bytes, offset, _traceFlagBytes);
offset += MessagePackBinary.WriteUInt32(ref bytes, offset, traceFlags);

// optional serialization
if (hasAttributes)
{
Expand All @@ -301,12 +301,6 @@ private int WriteSpanLink(ref byte[] bytes, int offset, in SpanModel spanModel)
offset += MessagePackBinary.WriteStringBytes(ref bytes, offset, _traceStateBytes);
offset += MessagePackBinary.WriteString(ref bytes, offset, traceState);
}

if (traceFlags > 0)
{
offset += MessagePackBinary.WriteStringBytes(ref bytes, offset, _traceFlagBytes);
offset += MessagePackBinary.WriteUInt32(ref bytes, offset, traceFlags);
}
}

return offset - originalOffset;
Expand Down Expand Up @@ -579,6 +573,14 @@ private int WriteTags(ref byte[] bytes, int offset, in SpanModel model, ITagProc
}
}

if (model.Span.SpanLinks is { Count: > 0 })
{
count++;
offset += MessagePackBinary.WriteStringBytes(ref bytes, offset, _ddSpanLinksBytes);
var json = ConvertSpanLinksToJson(span.SpanLinks);
offset += MessagePackBinary.WriteString(ref bytes, offset, json);
}

if (count > 0)
{
// Back-patch the count. End of "meta" dictionary. Do not add any string tags after this line.
Expand Down Expand Up @@ -765,6 +767,61 @@ private void InitializeAasTags()
}
}

private string ConvertSpanLinksToJson(IReadOnlyList<SpanLink> links)
{
var result = new List<Dictionary<string, object>>(links.Count);
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@lucaspimentel lucaspimentel Feb 13, 2025 •
edited
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Between the heap allocations and the json serializer's use reflection, this won't be great for performance. The MessagePack library has a MessagePackSerializer.ConvertToJson(), but I don't think we can use it easily here since it takes the MessagePack bytes as an argument.

If we really need to include this json (which is a separate question, see my other comments), we should serialize it manually, like we do for the MessagePack itself. Here's an example from the Newtonsoft.Json docs:

public static string ToJson(this Person p)
{
    StringWriter sw = new StringWriter();
    JsonTextWriter writer = new JsonTextWriter(sw);

    // {
    writer.WriteStartObject();

    // "name" : "Jerry"
    writer.WritePropertyName("name");
    writer.WriteValue(p.Name);

    // "likes": ["Comedy", "Superman"]
    writer.WritePropertyName("likes");
    writer.WriteStartArray();
    foreach (string like in p.Likes)
    {
        writer.WriteValue(like);
    }
    writer.WriteEndArray();

    // }
    writer.WriteEndObject();

    return sw.ToString();
}


foreach (var link in links)
{
var context = link.Context;

var samplingPriority = context.TraceContext?.SamplingPriority ?? context.SamplingPriority;
var traceFlags = samplingPriority switch
{
null => 0u, // not set
> 0 => 1u + (1u << 31), // "keep" bits
<= 0 => 1u << 31, // "drop"
};

var linkDict = new Dictionary<string, object>
{
["trace_id"] = context.TraceId128.Lower,
["trace_id_high"] = context.TraceId128.Upper,
["span_id"] = context.SpanId,
["flags"] = traceFlags,
};

if (context.IsRemote)
{
linkDict["tracestate"] = W3CTraceContextPropagator.CreateTraceStateHeader(context);
}
else
{
linkDict["tracestate"] = string.Empty;
}

// convert attributes list to a dictionary
if (link.Attributes is { Count: > 0 })
{
var attributes = new Dictionary<string, string>(link.Attributes.Count);
foreach (var attr in link.Attributes)
{
attributes[attr.Key] = attr.Value;
}

linkDict["attributes"] = attributes;
}
else
{
linkDict["attributes"] = new Dictionary<string, string>();
}

result.Add(linkDict);
}

return JsonConvert.SerializeObject(result);
}

internal struct TagWriter : IItemProcessor<string>, IItemProcessor<double>, IItemProcessor<byte[]>
{
private readonly SpanMessagePackFormatter _formatter;
Expand Down
8 changes: 8 additions & 0 deletions tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/NetActivitySdkTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,14 @@ public async Task SubmitsTraces()
settings.AddRegexScrubber(traceIdRegexHigh, "TraceIdHigh: LinkIdHigh");
settings.AddRegexScrubber(traceIdRegexLow, "TraceIdLow: LinkIdLow");
settings.AddRegexScrubber(_timeUnixNanoRegex, @"time_unix_nano"":<DateTimeOffset.Now>");

var spanLinkTraceIdRegex = new Regex("\"trace_id\":[0-9]+");
var spanLinkTraceIdHighRegex = new Regex("\"trace_id_high\":[0-9]+");
var spanLinkSpanIdRegex = new Regex("\"span_id\":[0-9]+");
settings.AddRegexScrubber(spanLinkTraceIdRegex, "\"trace_id\":link_trace_id_low");
settings.AddRegexScrubber(spanLinkTraceIdHighRegex, "\"trace_id_high\":link_trace_id_high");
settings.AddRegexScrubber(spanLinkSpanIdRegex, "\"span_id\":link_span_id");

await VerifyHelper.VerifySpans(spans, settings)
.UseFileName(nameof(NetActivitySdkTests));

Expand Down
16 changes: 16 additions & 0 deletions tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/OpenTelemetrySdkTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,14 @@ public async Task SubmitsTraces(string packageVersion)
settings.AddRegexScrubber(traceStatePRegex, "p:TsParentId");
settings.AddRegexScrubber(traceIdRegexHigh, "TraceIdHigh: LinkIdHigh");
settings.AddRegexScrubber(traceIdRegexLow, "TraceIdLow: LinkIdLow");

var spanLinkTraceIdRegex = new Regex("\"trace_id\":[0-9]+");
var spanLinkTraceIdHighRegex = new Regex("\"trace_id_high\":[0-9]+");
var spanLinkSpanIdRegex = new Regex("\"span_id\":[0-9]+");
settings.AddRegexScrubber(spanLinkTraceIdRegex, "\"trace_id\":link_trace_id_low");
settings.AddRegexScrubber(spanLinkTraceIdHighRegex, "\"trace_id_high\":link_trace_id_high");
settings.AddRegexScrubber(spanLinkSpanIdRegex, "\"span_id\":link_span_id");

settings.AddRegexScrubber(_versionRegex, "telemetry.sdk.version: sdk-version");
settings.AddRegexScrubber(_timeUnixNanoRegex, @"time_unix_nano"":<DateTimeOffset.Now>");
settings.AddRegexScrubber(_exceptionStacktraceRegex, @"exception.stacktrace"":""System.ArgumentException: Example argument exception"",""");
Expand Down Expand Up @@ -171,6 +179,14 @@ public async Task SubmitsTracesWithActivitySource(string packageVersion)
settings.AddRegexScrubber(traceIdRegexLow, "TraceIdLow: LinkIdLow");
settings.AddRegexScrubber(_timeUnixNanoRegex, @"time_unix_nano"":<DateTimeOffset.Now>");
settings.AddRegexScrubber(_exceptionStacktraceRegex, @"exception.stacktrace"":""System.ArgumentException: Example argument exception"",""");

var spanLinkTraceIdRegex = new Regex("\"trace_id\":[0-9]+");
var spanLinkTraceIdHighRegex = new Regex("\"trace_id_high\":[0-9]+");
var spanLinkSpanIdRegex = new Regex("\"span_id\":[0-9]+");
settings.AddRegexScrubber(spanLinkTraceIdRegex, "\"trace_id\":link_trace_id_low");
settings.AddRegexScrubber(spanLinkTraceIdHighRegex, "\"trace_id_high\":link_trace_id_high");
settings.AddRegexScrubber(spanLinkSpanIdRegex, "\"span_id\":link_span_id");

await VerifyHelper.VerifySpans(spans, settings)
.UseFileName(filename)
.DisableRequireUniquePrefix();
Expand Down
3 changes: 2 additions & 1 deletion tracer/test/Datadog.Trace.TestHelpers/SpanTagAssertion.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,8 @@ public static void DefaultTagAssertions(SpanTagAssertion<T> s) => s
.IsOptional("error.type")
.IsOptional("error.stack")
.IsOptional("_dd.git.repository_url")
.IsOptional("_dd.git.commit.sha");
.IsOptional("_dd.git.commit.sha")
.IsOptional("_dd.span_links");

public static void DefaultMetricAssertions(SpanTagAssertion<T> s) => s
.IsOptional("_dd.tracer_kr")
Expand Down
32 changes: 28 additions & 4 deletions tracer/test/Datadog.Trace.Tests/Agent/MessagePack/SpanMessagePackFormatterTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -194,17 +194,41 @@ public void SpanLink_Tag_Serialization()
> 0 => 1u + (1u << 31), // keep
<= 0 => 1u << 31, // drop
};
if (expectedTraceFlags > 0)
{
actualSpanLink.TraceFlags.Should().Be(expectedTraceFlags);
}
actualSpanLink.TraceFlags.Should().Be(expectedTraceFlags);

if (expectedSpanlink.Attributes is { Count: > 0 })
{
actualSpanLink.Attributes.Should().BeEquivalentTo(expectedSpanlink.Attributes);
}
}
}

// Verify links added to span[meta][_dd.span_links]
if (expected.SpanLinks is { Count: > 0 })
{
actual.Tags.Should().ContainKey("_dd.span_links");
var linksJson = actual.Tags["_dd.span_links"];
linksJson.Should().NotBeNullOrEmpty();

var parsedLinks = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Dictionary<string, object>>>(linksJson);
parsedLinks.Should().HaveCount(expected.SpanLinks.Count);

for (var j = 0; j < expected.SpanLinks.Count; j++)
{
var expectedLink = expected.SpanLinks[j];
var jsonLinkObject = parsedLinks[j];
jsonLinkObject["trace_id"].Should().Be((long)expectedLink.Context.TraceId128.Lower);
jsonLinkObject["trace_id_high"].Should().Be((long)expectedLink.Context.TraceId128.Upper);
jsonLinkObject["span_id"].ToString().Should().Be(expectedLink.Context.SpanId.ToString());
jsonLinkObject["flags"].Should().NotBeNull();
jsonLinkObject["tracestate"].Should().NotBeNull();
jsonLinkObject["attributes"].Should().NotBeNull();
}
}
else
{
actual.Tags.Should().NotContainKey("_dd.span_links");
}
}
}

Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/NetActivitySdkTests.verified.txt
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Expand Up @@ -15,7 +15,8 @@
runtime-id: Guid_2,
some_tag: value,
span.kind: server,
version: 1.0.0
version: 1.0.0,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483648,"tracestate":"","attributes":{"some_string":"five","some_string[].0":"a","some_string[].1":"b","some_string[].2":"c","some_bool":"False","some_bool[].0":"True","some_bool[].1":"False","some_int":"5","some_int[].0":"5","some_int[].1":"55","some_int[].2":"555"}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"dd=s:2;p:TsParentId;t.dm:-4,foo=1,bar=baz","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -140,7 +141,8 @@
otel.status_code: STATUS_CODE_UNSET,
otel.trace_id: Guid_4,
span.kind: server,
version: 1.0.0
version: 1.0.0,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483648,"tracestate":"","attributes":{}}]
},
Metrics: {
attribute-int: 1.0
Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/OpenTelemetrySdkTests.verified.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -911,7 +911,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
telemetry.sdk.language: dotnet,
telemetry.sdk.name: opentelemetry,
telemetry.sdk.version: sdk-version,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -949,7 +950,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
telemetry.sdk.language: dotnet,
telemetry.sdk.name: opentelemetry,
telemetry.sdk.version: sdk-version,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/OpenTelemetrySdkTestsWithActivitySource.verified.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -911,7 +911,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
telemetry.sdk.language: dotnet,
telemetry.sdk.name: opentelemetry,
telemetry.sdk.version: sdk-version,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -949,7 +950,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
telemetry.sdk.language: dotnet,
telemetry.sdk.name: opentelemetry,
telemetry.sdk.version: sdk-version,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/OpenTelemetrySdkTestsWithActivitySource_1_0.verified.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -806,7 +806,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
service.name: MyServiceName,
service.version: 1.0.x,
span.kind: internal,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -841,7 +842,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
service.name: MyServiceName,
service.version: 1.0.x,
span.kind: internal,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/OpenTelemetrySdkTestsWithActivitySource_up_to_1_5_0.verified.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -806,7 +806,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
service.name: MyServiceName,
service.version: 1.0.x,
span.kind: internal,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -841,7 +842,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
service.name: MyServiceName,
service.version: 1.0.x,
span.kind: internal,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/OpenTelemetrySdkTestsWithActivitySource_up_to_1_7_0.verified.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -911,7 +911,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
telemetry.sdk.language: dotnet,
telemetry.sdk.name: opentelemetry,
telemetry.sdk.version: sdk-version,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -949,7 +950,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
telemetry.sdk.language: dotnet,
telemetry.sdk.name: opentelemetry,
telemetry.sdk.version: sdk-version,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down
6 changes: 4 additions & 2 deletions tracer/test/snapshots/OpenTelemetrySdkTests_1_0.verified.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -806,7 +806,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
service.name: MyServiceName,
service.version: 1.0.x,
span.kind: internal,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down Expand Up @@ -841,7 +842,8 @@ at Samples.OpenTelemetrySdk.Program.RunSpanUpdateMethods(TelemetrySpan span),
service.name: MyServiceName,
service.version: 1.0.x,
span.kind: internal,
_dd.base_service: CustomServiceName
_dd.base_service: CustomServiceName,
_dd.span_links: [{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}},{"trace_id":link_trace_id_low,"trace_id_high":link_trace_id_high,"span_id":link_span_id,"flags":2147483649,"tracestate":"","attributes":{}}]
},
Metrics: {
process_id: 0,
Expand Down
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