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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 sqlite3
from flask import Flask
from opencensus.ext.flask.flask_middleware import FlaskMiddleware
from opentelemetry import trace
from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import (
OTLPSpanExporter,
)
from opentelemetry.instrumentation.sqlite3 import SQLite3Instrumentor
from opentelemetry.sdk.resources import Resource
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.shim.opencensus import install_shim
DB = "example.db"
# Set up OpenTelemetry
tracer_provider = TracerProvider(
resource=Resource(
{
"service.name": "opencensus-shim-example-flask",
}
)
)
trace.set_tracer_provider(tracer_provider)
# Configure OTel to export traces to Jaeger
tracer_provider.add_span_processor(
BatchSpanProcessor(
OTLPSpanExporter(
endpoint="localhost:4317",
)
)
)
tracer = tracer_provider.get_tracer(__name__)
# Install the shim to start bridging spans from OpenCensus to OpenTelemetry
install_shim()
# Instrument sqlite3 library
SQLite3Instrumentor().instrument()
# Setup Flask with OpenCensus instrumentation
app = Flask(__name__)
FlaskMiddleware(app)
# Setup the application database
def setup_db():
with sqlite3.connect(DB) as con:
cur = con.cursor()
cur.execute(
"""
CREATE TABLE IF NOT EXISTS movie(
title,
year,
PRIMARY KEY(title, year)
)
"""
)
cur.execute(
"""
INSERT OR IGNORE INTO movie(title, year) VALUES
('Mission Telemetry', 2000),
('Observing the World', 2010),
('The Tracer', 1999),
('The Instrument', 2020)
"""
)
setup_db()
@app.route("/")
def hello_world():
lines = []
with tracer.start_as_current_span("query movies from db"), sqlite3.connect(
DB
) as con:
cur = con.cursor()
for title, year in cur.execute("SELECT title, year from movie"):
lines.append(f"<li>{title} is from the year {year}</li>")
with tracer.start_as_current_span("build response html"):
html = f"<ul>{''.join(lines)}</ul>"
return html
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