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# Copyright The OpenTelemetry 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 flask
from flask import request
from opentelemetry import trace
from opentelemetry.instrumentation.flask import FlaskInstrumentor
application = flask.Flask(__name__)
FlaskInstrumentor().instrument_app(application)
tracer = trace.get_tracer(__name__)
def fib_slow(n):
if n <= 1:
return n
return fib_slow(n - 1) + fib_fast(n - 2)
def fib_fast(n):
nth_fib = [0] * (n + 2)
nth_fib[1] = 1
for i in range(2, n + 1):
nth_fib[i] = nth_fib[i - 1] + nth_fib[i - 2]
return nth_fib[n]
@application.route("/fibonacci")
def fibonacci():
n = int(request.args.get("n", 1))
with tracer.start_as_current_span("root"):
with tracer.start_as_current_span("fib_slow") as slow_span:
ans = fib_slow(n)
slow_span.set_attribute("n", n)
slow_span.set_attribute("nth_fibonacci", ans)
with tracer.start_as_current_span("fib_fast") as fast_span:
ans = fib_fast(n)
fast_span.set_attribute("n", n)
fast_span.set_attribute("nth_fibonacci", ans)
return f"F({n}) is: ({ans})"
if __name__ == "__main__":
application.run()
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