def init_tracing(tracer, trace_all_engines=True, trace_all_queries=True):
'''
Set our global tracer.
Tracer objects from our pyramid/flask/django libraries
can be passed as well.
'''
global g_tracer, g_trace_all_engines, g_trace_all_queries
if hasattr(tracer, '_tracer'):
tracer = tracer._tracer
g_tracer = tracer
g_trace_all_queries = trace_all_queries
g_trace_all_engines = trace_all_engines
if trace_all_engines:
register_engine(Engine)
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