fix(confluent-kafka): adapt python tracer to trace-test-suite

Signed-off-by: Cagri Yonca <[email protected]>

Author: CagriYonca

src/instana/instrumentation/kafka/confluent_kafka_python.py

@@ -1,19 +1,27 @@
 # (c) Copyright IBM Corp. 2025
 
+
 try:
+    import contextvars
     from typing import Any, Callable, Dict, List, Optional, Tuple
 
     import confluent_kafka  # noqa: F401
     import wrapt
     from confluent_kafka import Consumer, Producer
+    from opentelemetry import context, trace
     from opentelemetry.trace import SpanKind
 
     from instana.log import logger
     from instana.propagators.format import Format
+    from instana.singletons import get_tracer
     from instana.util.traceutils import (
         get_tracer_tuple,
         tracing_is_off,
     )
+    from instana.span.span import InstanaSpan
+
+    consumer_token = None
+    consumer_span = contextvars.ContextVar("confluent_kafka_consumer_span")
 
     # As confluent_kafka is a wrapper around the C-developed librdkafka
     # (provided automatically via binary wheels), we have to create new classes
@@ -47,6 +55,9 @@ def poll(
         ) -> Optional[confluent_kafka.Message]:
             return super().poll(timeout)
 
+        def close(self) -> None:
+            return super().close()
+
     def trace_kafka_produce(
         wrapped: Callable[..., InstanaConfluentKafkaProducer.produce],
         instance: InstanaConfluentKafkaProducer,
@@ -105,78 +116,145 @@ def create_span(
         headers: Optional[List[Tuple[str, bytes]]] = [],
         exception: Optional[str] = None,
     ) -> None:
-        tracer, parent_span, _ = get_tracer_tuple()
-        parent_context = (
-            parent_span.get_span_context()
-            if parent_span
-            else tracer.extract(
-                Format.KAFKA_HEADERS,
-                headers,
-                disable_w3c_trace_context=True,
+        try:
+            span = consumer_span.get(None)
+            if span is not None:
+                close_consumer_span(span)
+
+            tracer, parent_span, _ = get_tracer_tuple()
+
+            if not tracer:
+                tracer = get_tracer()
+            is_suppressed = False
+
+            if topic:
+                is_suppressed = tracer.exporter._HostAgent__is_endpoint_ignored(
+                    "kafka",
+                    span_type,
+                    topic,
+                )
+
+            if not is_suppressed and headers:
+                for header_name, header_value in headers:
+                    if header_name == "x_instana_l_s" and header_value == b"0":
+                        is_suppressed = True
+                        break
+
+            if is_suppressed:
+                return
+
+            parent_context = (
+                parent_span.get_span_context()
+                if parent_span
+                else (
+                    tracer.extract(
+                        Format.KAFKA_HEADERS,
+                        headers,
+                        disable_w3c_trace_context=True,
+                    )
+                    if tracer.exporter.options.kafka_trace_correlation
+                    else None
+                )
+            )
+            span = tracer.start_span(
+                "kafka-consumer", span_context=parent_context, kind=SpanKind.CONSUMER
             )
-        )
-        with tracer.start_as_current_span(
-            "kafka-consumer", span_context=parent_context, kind=SpanKind.CONSUMER
-        ) as span:
             if topic:
                 span.set_attribute("kafka.service", topic)
             span.set_attribute("kafka.access", span_type)
-
             if exception:
                 span.record_exception(exception)
+                span.end()
+
+            save_consumer_span_into_context(span)
+        except Exception as e:
+            logger.debug(
+                f"Error while creating kafka-consumer span: {e}"
+            )  # pragma: no cover
+
+    def save_consumer_span_into_context(span: "InstanaSpan") -> None:
+        global consumer_token
+        ctx = trace.set_span_in_context(span)
+        consumer_token = context.attach(ctx)
+        consumer_span.set(span)
+
+    def close_consumer_span(span: "InstanaSpan") -> None:
+        global consumer_token
+        if span.is_recording():
+            span.end()
+            consumer_span.set(None)
+        if consumer_token is not None:
+            context.detach(consumer_token)
+            consumer_token = None
+
+    def clear_context() -> None:
+        global consumer_token
+        context.attach(trace.set_span_in_context(None))
+        consumer_token = None
+        consumer_span.set(None)
 
     def trace_kafka_consume(
         wrapped: Callable[..., InstanaConfluentKafkaConsumer.consume],
         instance: InstanaConfluentKafkaConsumer,
         args: Tuple[int, str, Tuple[Any, ...]],
         kwargs: Dict[str, Any],
     ) -> List[confluent_kafka.Message]:
-        if tracing_is_off():
-            return wrapped(*args, **kwargs)
-
         res = None
         exception = None
 
         try:
             res = wrapped(*args, **kwargs)
+            for message in res:
+                create_span("consume", message.topic(), message.headers())
+            return res
         except Exception as exc:
             exception = exc
-        finally:
-            if res:
-                for message in res:
-                    create_span("consume", message.topic(), message.headers())
-            else:
-                create_span("consume", exception=exception)
+            create_span("consume", exception=exception)
 
-        return res
+    def trace_kafka_close(
+        wrapped: Callable[..., InstanaConfluentKafkaConsumer.close],
+        instance: InstanaConfluentKafkaConsumer,
+        args: Tuple[Any, ...],
+        kwargs: Dict[str, Any],
+    ) -> None:
+        try:
+            # Close any existing consumer span before closing the consumer
+            span = consumer_span.get(None)
+            if span is not None:
+                close_consumer_span(span)
+
+            # Execute the actual close operation
+            res = wrapped(*args, **kwargs)
+
+            logger.debug("Kafka consumer closed and spans cleaned up")
+            return res
+
+        except Exception:
+            # Still try to clean up the span even if close fails
+            span = consumer_span.get(None)
+            if span is not None:
+                close_consumer_span(span)
 
     def trace_kafka_poll(
         wrapped: Callable[..., InstanaConfluentKafkaConsumer.poll],
         instance: InstanaConfluentKafkaConsumer,
         args: Tuple[int, str, Tuple[Any, ...]],
         kwargs: Dict[str, Any],
     ) -> Optional[confluent_kafka.Message]:
-        if tracing_is_off():
-            return wrapped(*args, **kwargs)
-
         res = None
         exception = None
 
         try:
             res = wrapped(*args, **kwargs)
+            create_span("poll", res.topic(), res.headers())
+            return res
         except Exception as exc:
             exception = exc
-        finally:
-            if res:
-                create_span("poll", res.topic(), res.headers())
-            else:
-                create_span(
-                    "poll",
-                    next(iter(instance.list_topics().topics)),
-                    exception=exception,
-                )
-
-        return res
+            create_span(
+                "poll",
+                next(iter(instance.list_topics().topics)),
+                exception=exception,
+            )
 
     # Apply the monkey patch
     confluent_kafka.Producer = InstanaConfluentKafkaProducer
@@ -189,6 +267,9 @@ def trace_kafka_poll(
         InstanaConfluentKafkaConsumer, "consume", trace_kafka_consume
     )
     wrapt.wrap_function_wrapper(InstanaConfluentKafkaConsumer, "poll", trace_kafka_poll)
+    wrapt.wrap_function_wrapper(
+        InstanaConfluentKafkaConsumer, "close", trace_kafka_close
+    )
 
     logger.debug("Instrumenting Kafka (confluent_kafka)")
 except ImportError: