Added extracting and injecting context

cnn_classification_service/main.py

@@ -3,9 +3,10 @@ import time
 
 import jaeger_client
 import opentracing
+from opentracing.ext import tags
+from opentracing.propagation import Format
 
 import logging
-import os
 import sys
 import pika
 import json
@@ -19,7 +20,6 @@ from magic_doer import MagicDoer
 
 
 def message_callback(channel, method, properties, body):
-    with opentracing.tracer.start_active_span('main.handleMessage', finish_on_close=True) as scope:
     try:
         msg = json.loads(body.decode('utf-8'))
     except (UnicodeDecodeError, json.JSONDecodeError) as e:
@@ -27,7 +27,14 @@ def message_callback(channel, method, properties, body):
         channel.basic_ack(delivery_tag=method.delivery_tag)  # We don't want this to be requeue
         return
 
-        scope.span.log_kv({'event': 'messageParsed', 'sampleTag': msg['tag']})
+    logging.debug(f"Handling message: {msg}")
+
+    span_ctx = opentracing.tracer.extract(Format.TEXT_MAP, msg)
+    span_tags = {tags.SPAN_KIND: tags.SPAN_KIND_CONSUMER}
+
+    with opentracing.tracer.start_active_span(
+            'main.handleMessage', finish_on_close=True, child_of=span_ctx, tags=span_tags
+    ) as scope:
 
         with opentracing.tracer.start_active_span('magicDoer.runEverything'):
             try:
@@ -39,6 +46,8 @@ def message_callback(channel, method, properties, body):
                 return
 
         if results:
+            opentracing.tracer.inject(scope.span.context, Format.TEXT_MAP, results)
+            logging.debug(f"Publishing message: {results}")
             channel.basic_publish(
                 exchange=Config.PIKA_OUTPUT_EXCHANGE,
                 routing_key='classification-result',