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# Copyright 2017, OpenCensus Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import time
from opencensus.trace import execution_context
from opencensus.trace.exporters import print_exporter
from opencensus.trace.tracer import Tracer
from opencensus.trace.samplers import always_on
def function_to_trace():
time.sleep(1)
def main():
sampler = always_on.AlwaysOnSampler()
exporter = print_exporter.PrintExporter()
tracer = Tracer(sampler=sampler, exporter=exporter)
with tracer.span(name='root') as root_span:
tracer.add_attribute_to_current_span(attribute_key='example key',
attribute_value='example value')
function_to_trace()
with tracer.span(name='child') as child_span:
function_to_trace()
# Get the current tracer
tracer = execution_context.get_opencensus_tracer()
# Explicitly create spans
tracer.start_span()
# Get current span
cur_span = execution_context.get_current_span()
# Explicitly end span
tracer.end_span()
if __name__ == '__main__':
main()