From 33562f066eb53de589f9a1b08646ff8e21668ad2 Mon Sep 17 00:00:00 2001
From: Michael Hoffmann <michael.hoffmann@sentry.io>
Date: Wed, 30 Nov 2022 17:37:11 +0100
Subject: [PATCH] Transaction Source

---
 dynamic_sampling_context_test.go |  2 +-
 interfaces.go                    | 19 +++++++++++++------
 tracing.go                       |  1 +
 tracing_test.go                  |  1 +
 transport.go                     |  9 +++++----
 5 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/dynamic_sampling_context_test.go b/dynamic_sampling_context_test.go
index ca8bec70d..6957f8384 100644
--- a/dynamic_sampling_context_test.go
+++ b/dynamic_sampling_context_test.go
@@ -93,7 +93,7 @@ func TestDynamicSamplingContextFromTransaction(t *testing.T) {
 					Dsn:              "http://public@example.com/sentry/1",
 					Release:          "1.0.0",
 				})
-				txn := StartTransaction(ctx, "name")
+				txn := StartTransaction(ctx, "name", TransctionSource(SourceURL))
 				txn.TraceID = TraceIDFromHex("d49d9bf66f13450b81f65bc51cf49c03")
 				return txn
 			}(),
diff --git a/interfaces.go b/interfaces.go
index 5adf12518..ae581c403 100644
--- a/interfaces.go
+++ b/interfaces.go
@@ -222,6 +222,11 @@ type SDKMetaData struct {
 	transactionSource TransactionSource
 }
 
+// Contains information about how the name of the transaction was determined.
+type TransactionInfo struct {
+	Source TransactionSource `json:"source,omitempty"`
+}
+
 // EventID is a hexadecimal string representing a unique uuid4 for an Event.
 // An EventID must be 32 characters long, lowercase and not have any dashes.
 type EventID string
@@ -255,9 +260,10 @@ type Event struct {
 
 	// The fields below are only relevant for transactions.
 
-	Type      string    `json:"type,omitempty"`
-	StartTime time.Time `json:"start_timestamp"`
-	Spans     []*Span   `json:"spans,omitempty"`
+	Type            string           `json:"type,omitempty"`
+	StartTime       time.Time        `json:"start_timestamp"`
+	Spans           []*Span          `json:"spans,omitempty"`
+	TransactionInfo *TransactionInfo `json:"transaction_info,omitempty"`
 
 	// The fields below are not part of the final JSON payload.
 
@@ -303,9 +309,10 @@ func (e *Event) defaultMarshalJSON() ([]byte, error) {
 		// be sent for transactions. They shadow the respective fields in Event
 		// and are meant to remain nil, triggering the omitempty behavior.
 
-		Type      json.RawMessage `json:"type,omitempty"`
-		StartTime json.RawMessage `json:"start_timestamp,omitempty"`
-		Spans     json.RawMessage `json:"spans,omitempty"`
+		Type            json.RawMessage `json:"type,omitempty"`
+		StartTime       json.RawMessage `json:"start_timestamp,omitempty"`
+		Spans           json.RawMessage `json:"spans,omitempty"`
+		TransactionInfo json.RawMessage `json:"transaction_info,omitempty"`
 	}
 
 	x := errorEvent{event: (*event)(e)}
diff --git a/tracing.go b/tracing.go
index 33b4e5aa6..efd5dd884 100644
--- a/tracing.go
+++ b/tracing.go
@@ -83,6 +83,7 @@ func StartSpan(ctx context.Context, operation string, options ...SpanOption) *Sp
 		Op:        operation,
 		StartTime: time.Now(),
 		Sampled:   SampledUndefined,
+		Source:    SourceCustom,
 
 		ctx:           context.WithValue(ctx, spanContextKey{}, &span),
 		parent:        parent,
diff --git a/tracing_test.go b/tracing_test.go
index dc98277aa..1508abf5c 100644
--- a/tracing_test.go
+++ b/tracing_test.go
@@ -207,6 +207,7 @@ func TestStartChild(t *testing.T) {
 				ParentSpanID: child.ParentSpanID,
 				Op:           child.Op,
 				Sampled:      SampledTrue,
+				Source:       child.Source,
 			},
 		},
 	}
diff --git a/transport.go b/transport.go
index 6661f6a2c..841b4d782 100644
--- a/transport.go
+++ b/transport.go
@@ -98,11 +98,12 @@ func transactionEnvelopeFromBody(event *Event, dsn *Dsn, sentAt time.Time, body
 	var b bytes.Buffer
 	enc := json.NewEncoder(&b)
 
-	dsc := event.sdkMetaData.dsc
+	// Construct the trace envolope header
 	var trace = map[string]string{}
-
-	for k, v := range dsc.Entries {
-		trace[k] = v
+	if dsc := event.sdkMetaData.dsc; dsc.HasEntries() {
+		for k, v := range dsc.Entries {
+			trace[k] = v
+		}
 	}
 
 	// Envelope header