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Original file line number | Diff line number | Diff line change |
---|---|---|
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import time | ||
import logging | ||
|
||
from flask import Blueprint, Response, request | ||
from prometheus_client import Counter, Histogram, generate_latest | ||
from pyms.flask.services.driver import DriverService | ||
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# Based on https://github.com/sbarratt/flask-prometheus | ||
# and https://github.com/korfuri/python-logging-prometheus/ | ||
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FLASK_REQUEST_LATENCY = Histogram( | ||
"flask_request_latency_seconds", "Flask Request Latency", ["method", "endpoint"] | ||
) | ||
FLASK_REQUEST_COUNT = Counter( | ||
"flask_request_count", "Flask Request Count", ["method", "endpoint", "http_status"] | ||
) | ||
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||
LOGGER_TOTAL_MESSAGES = Counter( | ||
"python_logging_messages_total", | ||
"Count of log entries by service and level.", | ||
["service", "level"], | ||
) | ||
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def before_request(): | ||
request.start_time = time.time() | ||
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def after_request(response): | ||
request_latency = time.time() - request.start_time | ||
FLASK_REQUEST_LATENCY.labels(request.method, request.path).observe(request_latency) | ||
FLASK_REQUEST_COUNT.labels(request.method, request.path, response.status_code).inc() | ||
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return response | ||
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class Service(DriverService): | ||
service = "metrics" | ||
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def __init__(self, service, *args, **kwargs): | ||
super().__init__(service, *args, **kwargs) | ||
self.metrics_blueprint = Blueprint("metrics", __name__) | ||
self.serve_metrics() | ||
|
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def monitor(self, app): | ||
app.before_request(before_request) | ||
app.after_request(after_request) | ||
|
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def serve_metrics(self): | ||
@self.metrics_blueprint.route("/metrics", methods=["GET"]) | ||
def metrics(): | ||
return Response( | ||
generate_latest(), | ||
mimetype="text/print()lain", | ||
content_type="text/plain; charset=utf-8", | ||
) | ||
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def add_logger_handler(self, logger, service_name): | ||
logger.addHandler(MetricsLogHandler(service_name)) | ||
return logger | ||
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class MetricsLogHandler(logging.Handler): | ||
"""A LogHandler that exports logging metrics for Prometheus.io.""" | ||
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def __init__(self, app_name): | ||
super(MetricsLogHandler, self).__init__() | ||
self.app_name = app_name | ||
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def emit(self, record): | ||
LOGGER_TOTAL_MESSAGES.labels(self.app_name, record.levelname).inc() |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,11 @@ | ||
--- | ||
pyms: | ||
metrics: true | ||
tracer: | ||
client: "jaeger" | ||
component_name: "Python Microservice" | ||
my-ms: | ||
DEBUG: true | ||
TESTING: true | ||
APP_NAME: "Python Microservice" | ||
APPLICATION_ROOT: / |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,48 @@ | ||
#!/usr/bin/env python | ||
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import os | ||
import unittest.mock | ||
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from flask import current_app | ||
from prometheus_client import generate_latest | ||
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from pyms.constants import CONFIGMAP_FILE_ENVIRONMENT | ||
from pyms.flask.app import Microservice | ||
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class TestMetricsFlask(unittest.TestCase): | ||
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BASE_DIR = os.path.dirname(os.path.abspath(__file__)) | ||
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def setUp(self): | ||
os.environ[CONFIGMAP_FILE_ENVIRONMENT] = os.path.join(self.BASE_DIR, "config-tests-metrics.yml") | ||
ms = Microservice(service="my-ms", path=__file__) | ||
self.app = ms.create_app() | ||
self.client = self.app.test_client() | ||
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def test_metrics_latency(self): | ||
self.client.get("/") | ||
self.client.get("/metrics") | ||
generated_latency_root = b'flask_request_latency_seconds_bucket{endpoint="/",le="0.005",method="GET"}' | ||
generated_latency_metrics = b'flask_request_latency_seconds_bucket{endpoint="/metrics",le="0.005",method="GET"}' | ||
assert generated_latency_root in generate_latest() | ||
assert generated_latency_metrics in generate_latest() | ||
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def test_metrics_count(self): | ||
self.client.get("/") | ||
self.client.get("/metrics") | ||
generated_count_root = b'flask_request_count_total{endpoint="/",http_status="200",method="GET"}' | ||
generated_count_metrics = b'flask_request_count_total{endpoint="/metrics",http_status="200",method="GET"}' | ||
assert generated_count_root in generate_latest() | ||
assert generated_count_metrics in generate_latest() | ||
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def test_metrics_logger(self): | ||
self.client.get("/") | ||
self.client.get("/metrics") | ||
generated_logger = b'python_logging_messages_total{level="INFO",service="Python Microservice With Flask and Lightstep"}' | ||
assert generated_logger in generate_latest() | ||
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def test_metrics_jaeger(self): | ||
self.client.get("/") | ||
self.client.get("/metrics") | ||
generated_logger = b'jaeger:reporter_spans_total' | ||
assert generated_logger in generate_latest() |