flask app prometheus update

.gitignore

@@ -87,3 +87,6 @@ ENV/
 
 # Rope project settings
 .ropeproject
+
+# Misc
+.DS_Store

flask_app_promethus/Dockerfile.py2

@@ -7,8 +7,8 @@ RUN set -e; \
 		libc-dev \
 		linux-headers \
 	; \
-	pip install -r requirements.txt; \
+	pip install -r src/requirements.txt; \
 	apk del .build-deps;
 EXPOSE 5000
-RUN python --version
+VOLUME /application
 CMD uwsgi --http :5000  --manage-script-name --mount /myapplication=flask_app:app --enable-threads --processes 5

flask_app_promethus/Dockerfile.py3

@@ -7,8 +7,8 @@ RUN set -e; \
 		libc-dev \
 		linux-headers \
 	; \
-	pip install -r requirements.txt; \
+	pip install -r src/requirements.txt; \
 	apk del .build-deps;
 EXPOSE 5000
-RUN python --version
+VOLUME /application
 CMD uwsgi --http :5000  --manage-script-name --mount /myapplication=flask_app:app --enable-threads --processes 5

flask_app_promethus/README.md

@@ -1,3 +1,7 @@
+# Example Flask application
+
+See ``src`` for the application code.
+
 ## Building Docker image
 
 Python 3:
@@ -6,18 +10,10 @@ Python 3:
 $ docker build -t amitsaha/flask_app -f Dockerfile.py3 .
 ```
 
-Python 2:
-
-```
-$ docker build -t amitsaha/flask_app -f Dockerfile.py2 .
-```
-
 ## Running the application
 
 ```
-$ docker run -P amitsaha/flask_app
-
-$ docker ps # will show the mapped port on the host
+$ docker run  -ti -p 5000:5000 -v `pwd`/src:/application amitsaha/flask_app
 ```
 
 ## Bringing up the web application, along with prometheus

flask_app_promethus/src/flask_app.py

@@ -0,0 +1,21 @@
+from flask import Flask
+from middleware import setup_metrics
+
+app = Flask(__name__)
+setup_metrics(app)
+
+@app.route('/test/')
+def test():
+    return 'rest'
+
+@app.route('/test1/')
+def test1():
+    1/0
+    return 'rest'
+
+@app.errorhandler(500)
+def handle_500(error):
+    return str(error), 500
+
+if __name__ == '__main__':
+    app.run()

flask_app_promethus/src/middleware.py

@@ -0,0 +1,23 @@
+from flask import request
+import time
+import sys
+
+def start_timer():
+    request.start_time = time.time()
+
+def stop_timer(response):
+    resp_time = time.time() - request.start_time
+    sys.stderr.write("Response time: %ss\n" % resp_time)
+    return response
+
+def record_request_data(response):
+    sys.stderr.write("Request path: %s Request method: %s Response status: %s\n" %
+            (request.path, request.method, response.status_code))
+    return response
+
+def setup_metrics(app):
+    app.before_request(start_timer)
+    # The order here matters since we want stop_timer
+    # to be executed first
+    app.after_request(record_request_data)
+    app.after_request(stop_timer)