feat: add StrictTraceContinuation option

client.go

@@ -148,6 +148,16 @@ type ClientOptions struct {
 	// PropagateTraceparent is used to control whether the W3C Trace Context HTTP traceparent header
 	// is propagated on outgoing http requests.
 	PropagateTraceparent bool
+	// StrictTraceContinuation is used to control trace continuation from 3rd party services that happen to be
+	// instrumented by Sentry.
+	//
+	// Enabling the option means that the SDK will require the org ids from baggage to match for continuing the trace.
+	StrictTraceContinuation bool
+	// OrgID configures the orgID used for trace continuation.
+	//
+	// In most cases the orgID is already parsed from the DSN. This option should be used when non-standard Sentry DSNs
+	// are used, such as self-hosted or when using a local Relay.
+	OrgID uint64
 	// List of regexp strings that will be used to match against event's message
 	// and if applicable, caught errors type and value.
 	// If the match is found, then a whole event will be dropped.
@@ -404,7 +414,9 @@ func NewClient(options ClientOptions) (*Client, error) {
 		client.batchMeter = newMetricBatchProcessor(&client)
 		client.batchMeter.Start()
 	}
-
+	if options.OrgID != 0 && client.dsn != nil {
+		client.dsn.SetOrgID(options.OrgID)
+	}
 	client.setupIntegrations()
 
 	return &client, nil

dynamic_sampling_context.go

@@ -63,6 +63,9 @@ func DynamicSamplingContextFromTransaction(span *Span) DynamicSamplingContext {
 		if publicKey := dsn.GetPublicKey(); publicKey != "" {
 			entries["public_key"] = publicKey
 		}
+		if orgID := dsn.GetOrgID(); orgID != 0 {
+			entries["org_id"] = strconv.FormatUint(orgID, 10)
+		}
 	}
 	if release := client.options.Release; release != "" {
 		entries["release"] = release

internal/protocol/dsn.go

@@ -49,6 +49,7 @@ type Dsn struct {
 	port      int
 	path      string
 	projectID string
+	orgID     uint64
 }
 
 // NewDsn creates a Dsn by parsing rawURL. Most users will never call this
@@ -90,6 +91,17 @@ func NewDsn(rawURL string) (*Dsn, error) {
 		return nil, &DsnParseError{"empty host"}
 	}
 
+	// OrgID (optional)
+	var orgID uint64
+	parts := strings.Split(host, ".")
+	orgPart := parts[0]
+	if len(orgPart) >= 2 && orgPart[0] == 'o' {
+		parsedOrgID, err := strconv.ParseUint(orgPart[1:], 10, 64)
+		if err == nil {
+			orgID = parsedOrgID
+		}
+	}
+
 	// Port
 	var port int
 	if p := parsedURL.Port(); p != "" {
@@ -126,6 +138,7 @@ func NewDsn(rawURL string) (*Dsn, error) {
 		port:      port,
 		path:      path,
 		projectID: projectID,
+		orgID:     orgID,
 	}, nil
 }
 
@@ -182,6 +195,16 @@ func (dsn Dsn) GetProjectID() string {
 	return dsn.projectID
 }
 
+// GetOrgID returns the orgID that was parsed from the DSN.
+func (dsn Dsn) GetOrgID() uint64 {
+	return dsn.orgID
+}
+
+// SetOrgID sets the orgID used for trace continuation.
+func (dsn *Dsn) SetOrgID(orgID uint64) {
+	dsn.orgID = orgID
+}
+
 // GetAPIURL returns the URL of the envelope endpoint of the project
 // associated with the DSN.
 func (dsn Dsn) GetAPIURL() *url.URL {

tracing.go

@@ -953,8 +953,15 @@ func WithSpanOrigin(origin SpanOrigin) SpanOption {
 func ContinueTrace(hub *Hub, traceparent, baggage string) SpanOption {
 	scope := hub.Scope()
 	propagationContext, _ := PropagationContextFromHeaders(traceparent, baggage)
-	scope.SetPropagationContext(propagationContext)
+	client := hub.Client()
+
+	if !shouldContinueTrace(client, propagationContext.DynamicSamplingContext) {
+		propagationContext = NewPropagationContext()
+		traceparent = ""
+		baggage = ""
+	}
 
+	scope.SetPropagationContext(propagationContext)
 	return ContinueFromHeaders(traceparent, baggage)
 }
 
@@ -973,19 +980,35 @@ func ContinueFromRequest(r *http.Request) SpanOption {
 // an existing TraceID and propagates the Dynamic Sampling context.
 func ContinueFromHeaders(trace, baggage string) SpanOption {
 	return func(s *Span) {
-		if trace != "" {
-			s.updateFromSentryTrace([]byte(trace))
+		if trace == "" {
+			return
+		}
 
-			if baggage != "" {
-				s.updateFromBaggage([]byte(baggage))
+		// Parse baggage first to get org_id for comparison
+		var dsc DynamicSamplingContext
+		if baggage != "" {
+			parsed, err := DynamicSamplingContextFromHeader([]byte(baggage))
+			if err == nil {
+				dsc = parsed
 			}
+		}
 
-			// In case a sentry-trace header is present but there are no sentry-related
-			// values in the baggage, create an empty, frozen DynamicSamplingContext.
-			if !s.dynamicSamplingContext.HasEntries() {
-				s.dynamicSamplingContext = DynamicSamplingContext{
-					Frozen: true,
-				}
+		client := hubFromContext(s.ctx).Client()
+		if !shouldContinueTrace(client, dsc) {
+			return // leave span unchanged → behaves as head of trace
+		}
+
+		s.updateFromSentryTrace([]byte(trace))
+
+		if baggage != "" {
+			s.updateFromBaggage([]byte(baggage))
+		}
+
+		// In case a sentry-trace header is present but there are no sentry-related
+		// values in the baggage, create an empty, frozen DynamicSamplingContext.
+		if !s.dynamicSamplingContext.HasEntries() {
+			s.dynamicSamplingContext = DynamicSamplingContext{
+				Frozen: true,
 			}
 		}
 	}
@@ -998,6 +1021,10 @@ func ContinueFromTrace(trace string) SpanOption {
 		if trace == "" {
 			return
 		}
+		client := hubFromContext(s.ctx).Client()
+		if !shouldContinueTrace(client, DynamicSamplingContext{}) {
+			return
+		}
 		s.updateFromSentryTrace([]byte(trace))
 	}
 }
@@ -1077,3 +1104,35 @@ func HTTPtoSpanStatus(code int) SpanStatus {
 	}
 	return SpanStatusUnknown
 }
+
+func shouldContinueTrace(client *Client, dsc DynamicSamplingContext) bool {
+	if client == nil {
+		return true
+	}
+
+	sdkOrgID := client.options.OrgID
+	if sdkOrgID == 0 && client.dsn != nil {
+		sdkOrgID = client.dsn.GetOrgID()
+	}
+
+	baggageOrgStr := dsc.Entries["org_id"]
+	baggageOrgID := uint64(0)
+	if baggageOrgStr != "" {
+		baggageOrgID, _ = strconv.ParseUint(baggageOrgStr, 10, 64)
+	}
+
+	// we reject non-matching orgs regardless of strict mode
+	if sdkOrgID != 0 && baggageOrgID != 0 && sdkOrgID != baggageOrgID {
+		return false
+	}
+
+	// If strict mode is on, both must be present and match
+	if client.options.StrictTraceContinuation {
+		if sdkOrgID == 0 && baggageOrgID == 0 {
+			return true
+		}
+		return sdkOrgID == baggageOrgID
+	}
+
+	return true
+}

tracing_test.go

@@ -485,6 +485,7 @@ func TestContinueSpanFromRequest(t *testing.T) {
 		sampled := sampled
 		t.Run(sampled.String(), func(t *testing.T) {
 			var s Span
+			s.ctx = context.Background()
 			hkey := http.CanonicalHeaderKey("sentry-trace")
 			hval := (&Span{
 				TraceID: traceID,
@@ -585,12 +586,13 @@ func TestContinueTransactionFromHeaders(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			s := &Span{}
+			s.ctx = context.Background()
 			spanOption := ContinueFromHeaders(tt.traceStr, tt.baggageStr)
 			spanOption(s)
 
 			if diff := cmp.Diff(tt.wantSpan, s, cmp.Options{
 				cmp.AllowUnexported(Span{}),
-				cmpopts.IgnoreFields(Span{}, "mu", "finishOnce"),
+				cmpopts.IgnoreFields(Span{}, "ctx", "mu", "finishOnce"),
 			}); diff != "" {
 				t.Fatalf("Expected no difference on spans, got: %s", diff)
 			}
@@ -605,13 +607,14 @@ func TestContinueSpanFromTrace(t *testing.T) {
 	for _, sampled := range []Sampled{SampledTrue, SampledFalse, SampledUndefined} {
 		sampled := sampled
 		t.Run(sampled.String(), func(t *testing.T) {
-			var s Span
+			s := &Span{}
+			s.ctx = context.Background()
 			trace := (&Span{
 				TraceID: traceID,
 				SpanID:  spanID,
 				Sampled: sampled,
 			}).ToSentryTrace()
-			ContinueFromTrace(trace)(&s)
+			ContinueFromTrace(trace)(s)
 			if s.TraceID != traceID {
 				t.Errorf("got %q, want %q", s.TraceID, traceID)
 			}
@@ -1287,3 +1290,67 @@ func TestSpanScopeManagement(t *testing.T) {
 		t.Errorf("expected SpanID %s, got %s", transaction.SpanID, spanID)
 	}
 }
+
+func TestStrictTraceContinuation(t *testing.T) {
+	incomingTraceID := TraceIDFromHex("bc6d53f15eb88f4320054569b8c553d4")
+	sentryTrace := "bc6d53f15eb88f4320054569b8c553d4-b72fa28504b07285-1"
+
+	baggageWithOrg := func(orgID string) string {
+		return "sentry-org_id=" + orgID + ",sentry-trace_id=bc6d53f15eb88f4320054569b8c553d4"
+	}
+	baggageWithoutOrg := "sentry-trace_id=bc6d53f15eb88f4320054569b8c553d4"
+
+	tests := []struct {
+		name          string
+		baggageOrgID  string
+		sdkOrgID      uint64
+		strict        bool
+		wantContinued bool
+	}{
+		{"strict=false, baggage=1, sdk=1", "1", 1, false, true},
+		{"strict=false, baggage=none, sdk=1", "", 1, false, true},
+		{"strict=false, baggage=1, sdk=none", "1", 0, false, true},
+		{"strict=false, baggage=none, sdk=none", "", 0, false, true},
+		{"strict=false, baggage=1, sdk=2", "1", 2, false, false},
+
+		{"strict=true, baggage=1, sdk=1", "1", 1, true, true},
+		{"strict=true, baggage=none, sdk=1", "", 1, true, false},
+		{"strict=true, baggage=1, sdk=none", "1", 0, true, false},
+		{"strict=true, baggage=none, sdk=none", "", 0, true, true},
+		{"strict=true, baggage=1, sdk=2", "1", 2, true, false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			transport := &MockTransport{}
+			ctx := NewTestContext(ClientOptions{
+				EnableTracing:           true,
+				TracesSampleRate:        1.0,
+				Transport:               transport,
+				StrictTraceContinuation: tt.strict,
+				OrgID:                   tt.sdkOrgID,
+			})
+
+			baggage := baggageWithoutOrg
+			if tt.baggageOrgID != "" {
+				baggage = baggageWithOrg(tt.baggageOrgID)
+			}
+
+			hub := GetHubFromContext(ctx)
+			transaction := StartTransaction(ctx, "test",
+				ContinueTrace(hub, sentryTrace, baggage),
+			)
+			transaction.Finish()
+
+			if tt.wantContinued {
+				if transaction.TraceID != incomingTraceID {
+					t.Errorf("expected trace to be continued, got new TraceID %s", transaction.TraceID)
+				}
+			} else {
+				if transaction.TraceID == incomingTraceID {
+					t.Errorf("expected new trace, but got continued TraceID %s", transaction.TraceID)
+				}
+			}
+		})
+	}
+}