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add datadog-origin header #215

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Merged
ojproductions merged 1 commit into from
Oct 16, 2025
Merged

add datadog-origin header #215

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1 change: 1 addition & 0 deletions internal/extension/extension.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@ const (
DdParentId ddTraceContext = "x-datadog-parent-id"
DdSpanId ddTraceContext = "x-datadog-span-id"
DdSamplingPriority ddTraceContext = "x-datadog-sampling-priority"
DdOrigin ddTraceContext = "x-datadog-origin"
DdInvocationError ddTraceContext = "x-datadog-invocation-error"
DdInvocationErrorMsg ddTraceContext = "x-datadog-invocation-error-msg"
DdInvocationErrorType ddTraceContext = "x-datadog-invocation-error-type"
Expand Down
1 change: 1 addition & 0 deletions internal/trace/constants.go
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Expand Up @@ -12,6 +12,7 @@ const (
traceIDHeader = "x-datadog-trace-id"
parentIDHeader = "x-datadog-parent-id"
samplingPriorityHeader = "x-datadog-sampling-priority"
originHeader = "x-datadog-origin"
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joeyzhao2018 marked this conversation as resolved.
)

const (
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7 changes: 7 additions & 0 deletions internal/trace/context.go
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Expand Up @@ -160,6 +160,13 @@ func getTraceContext(ctx context.Context, headers map[string]string) (TraceConte
samplingPriority = "1" //sampler-keep
}

// try to pull datadog origin from either headers or context
if origin, ok := headers[originHeader]; ok {
tc[originHeader] = origin
} else if origin, ok := ctx.Value(extension.DdOrigin).(string); ok {
tc[originHeader] = origin
}

tc[samplingPriorityHeader] = samplingPriority
tc[traceIDHeader] = traceID
tc[parentIDHeader] = parentID
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27 changes: 24 additions & 3 deletions internal/trace/context_test.go
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Expand Up @@ -44,7 +44,7 @@ func mockLambdaXRayTraceContext(ctx context.Context, traceID, parentID string, s
return context.WithValue(ctx, xray.LambdaTraceHeaderKey, headerString)
}

func mockTraceContext(traceID, parentID, samplingPriority string) context.Context {
func mockTraceContext(traceID, parentID, samplingPriority, origin string) context.Context {
ctx := context.Background()
if traceID != "" {
ctx = context.WithValue(ctx, extension.DdTraceId, traceID)
Expand All @@ -55,6 +55,9 @@ func mockTraceContext(traceID, parentID, samplingPriority string) context.Contex
if samplingPriority != "" {
ctx = context.WithValue(ctx, extension.DdSamplingPriority, samplingPriority)
}
if origin != "" {
ctx = context.WithValue(ctx, extension.DdOrigin, origin)
}
return ctx
}

Expand Down Expand Up @@ -135,13 +138,28 @@ func TestGetDatadogTraceContextFromContextObject(t *testing.T) {
traceID string
parentID string
samplingPriority string
origin string
expectTC TraceContext
expectOk bool
}{
{
"trace",
"parent",
"sampling",
"origin",
TraceContext{
"x-datadog-trace-id": "trace",
"x-datadog-parent-id": "parent",
"x-datadog-sampling-priority": "sampling",
"x-datadog-origin": "origin",
},
true,
},
{
"trace",
"parent",
"sampling",
"",
TraceContext{
"x-datadog-trace-id": "trace",
"x-datadog-parent-id": "parent",
Expand All @@ -153,20 +171,23 @@ func TestGetDatadogTraceContextFromContextObject(t *testing.T) {
"",
"parent",
"sampling",
"origin",
TraceContext{},
false,
},
{
"trace",
"",
"sampling",
"",
TraceContext{},
false,
},
{
"trace",
"parent",
"",
"",
TraceContext{
"x-datadog-trace-id": "trace",
"x-datadog-parent-id": "parent",
Expand All @@ -178,8 +199,8 @@ func TestGetDatadogTraceContextFromContextObject(t *testing.T) {

ev := loadRawJSON(t, "../testdata/non-proxy-no-headers.json")
for _, test := range testcases {
t.Run(test.traceID+test.parentID+test.samplingPriority, func(t *testing.T) {
ctx := mockTraceContext(test.traceID, test.parentID, test.samplingPriority)
t.Run(test.traceID+test.parentID+test.samplingPriority+test.origin, func(t *testing.T) {
ctx := mockTraceContext(test.traceID, test.parentID, test.samplingPriority, test.origin)
tc, ok := getTraceContext(ctx, getHeadersFromEventHeaders(ctx, *ev))
assert.Equal(t, test.expectTC, tc)
assert.Equal(t, test.expectOk, ok)
Expand Down
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