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# Copyright 2018 Google LLC
#
# 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 argparse
import random
import time
from flask import Flask, redirect, url_for
# [START trace_setup_python_configure]
from opencensus.ext.stackdriver import trace_exporter as stackdriver_exporter
import opencensus.trace.tracer
def initialize_tracer(project_id):
exporter = stackdriver_exporter.StackdriverExporter(
project_id=project_id
)
tracer = opencensus.trace.tracer.Tracer(
exporter=exporter,
sampler=opencensus.trace.tracer.samplers.AlwaysOnSampler()
)
return tracer
# [END trace_setup_python_configure]
app = Flask(__name__)
@app.route('/', methods=['GET'])
def root():
return redirect(url_for('index'))
# [START trace_setup_python_quickstart]
@app.route('/index.html', methods=['GET'])
def index():
tracer = app.config['TRACER']
tracer.start_span(name='index')
# Add up to 1 sec delay, weighted toward zero
time.sleep(random.random() ** 2)
result = "Tracing requests"
tracer.end_span()
return result
# [END trace_setup_python_quickstart]
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter
)
parser.add_argument(
'--project_id', help='Project ID you want to access.', required=True)
args = parser.parse_args()
tracer = initialize_tracer(args.project_id)
app.config['TRACER'] = tracer
app.run()