Always add sampled flag to W3C traceparent (#1713)

Author: cleptric

src/Tracing/PropagationContext.php

@@ -72,7 +72,7 @@ public function toTraceparent(): string
      */
     public function toW3CTraceparent(): string
     {
-        return sprintf('00-%s-%s', (string) $this->traceId, (string) $this->spanId);
+        return sprintf('00-%s-%s-00', (string) $this->traceId, (string) $this->spanId);
     }
 
     /**

src/Tracing/Span.php

@@ -578,10 +578,13 @@ public function toW3CTraceparent(): string
         $sampled = '';
 
         if ($this->sampled !== null) {
-            $sampled = $this->sampled ? '-01' : '-00';
+            $sampled = $this->sampled ? '01' : '00';
+        } else {
+            // If no sampling decision was made, set the flag to 00
+            $sampled = '00';
         }
 
-        return sprintf('00-%s-%s%s', (string) $this->traceId, (string) $this->spanId, $sampled);
+        return sprintf('00-%s-%s-%s', (string) $this->traceId, (string) $this->spanId, $sampled);
     }
 
     /**

tests/FunctionsTest.php

@@ -444,7 +444,7 @@ public function testW3CTraceparentWithTracingDisabled(): void
 
         $traceParent = getW3CTraceparent();
 
-        $this->assertSame('00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8', $traceParent);
+        $this->assertSame('00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8-00', $traceParent);
     }
 
     public function testW3CTraceparentWithTracingEnabled(): void
@@ -462,15 +462,16 @@ public function testW3CTraceparentWithTracingEnabled(): void
 
         $spanContext = (new SpanContext())
             ->setTraceId(new TraceId('566e3688a61d4bc888951642d6f14a19'))
-            ->setSpanId(new SpanId('566e3688a61d4bc8'));
+            ->setSpanId(new SpanId('566e3688a61d4bc8'))
+            ->setSampled(true);
 
         $span = new Span($spanContext);
 
         $hub->setSpan($span);
 
         $traceParent = getW3CTraceparent();
 
-        $this->assertSame('00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8', $traceParent);
+        $this->assertSame('00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8-01', $traceParent);
     }
 
     public function testBaggageWithTracingDisabled(): void

tests/Tracing/PropagationContextTest.php

@@ -118,7 +118,7 @@ public function testToW3CTraceparent()
         $propagationContext->setTraceId(new TraceId('566e3688a61d4bc888951642d6f14a19'));
         $propagationContext->setSpanId(new SpanId('566e3688a61d4bc8'));
 
-        $this->assertSame('00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8', $propagationContext->toW3CTraceparent());
+        $this->assertSame('00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8-00', $propagationContext->toW3CTraceparent());
     }
 
     public function testToBaggage()

tests/Tracing/TransactionContextTest.php

@@ -137,16 +137,6 @@ public static function tracingDataProvider(): iterable
             true,
         ];
 
-        yield [
-            '00-566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8',
-            '',
-            new SpanId('566e3688a61d4bc8'),
-            new TraceId('566e3688a61d4bc888951642d6f14a19'),
-            null,
-            DynamicSamplingContext::class,
-            true,
-        ];
-
         yield [
             '566e3688a61d4bc888951642d6f14a19-566e3688a61d4bc8-1',
             'sentry-public_key=public,sentry-trace_id=566e3688a61d4bc888951642d6f14a19,sentry-sample_rate=1',