opentracing_quickstart_span_context_manager_with_nesting.py

1import opentracing
2
3# Create a tracer (in a real application, you would use a concrete 
4# implementation like Jaeger or Zipkin. Here we use the default no-op tracer).
5tracer = opentracing.global_tracer()
6
7# Start a new span to track a unit of work
8with tracer.start_active_span('hello-world') as scope:
9    scope.span.set_tag('example-tag', 'value')
10    
11    # Perform the work you want to trace
12    print("Hello, World!")
13    
14    # Spans can also be nested
15    with tracer.start_active_span('child-span') as child_scope:
16        child_scope.span.log_kv({'event': 'test message', 'life': 42})
17        print("Doing some nested work...")