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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()