add healthchecks

model_service/app.py

@@ -4,11 +4,12 @@ import sentry_sdk
 from sentry_sdk.integrations.flask import FlaskIntegration
 from flask import Flask
 from werkzeug.middleware.proxy_fix import ProxyFix
+from healthcheck import HealthCheck
 
 # import stuff
 from model import db
 
-from utils import register_all_error_handlers, storage
+from utils import register_all_error_handlers, storage, health_database_status
 
 # import views
 from views import SVMView, CNNView, RootView
@@ -47,6 +48,7 @@ app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 # initialize stuff
 db.init_app(app)
 storage.init_app(app)
+health = HealthCheck(app, "/healthz")
 
 
 @app.before_first_request
@@ -61,6 +63,8 @@ register_all_error_handlers(app)
 for view in [SVMView, CNNView, RootView]:
     view.register(app, trailing_slash=False, route_prefix='/model')
 
+health.add_check(health_database_status)
+
 # start debuggig if needed
 if __name__ == "__main__":
     app.run(debug=True)

model_service/utils/__init__.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
 from .require_decorators import json_required, multipart_required
 from .error_handlers import register_all_error_handlers
-from .storage import storage, ensure_buckets
+from .storage import storage, ensure_buckets
+from .healthckecks import health_database_status

model_service/utils/healthckecks.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+from model import db
+
+"""
+Healthchek functions
+"""
+
+__author__ = "@tormakris"
+__copyright__ = "Copyright 2020, Birbnetes Team"
+__module_name__ = "healthchecks"
+__version__text__ = "1"
+
+
+def health_database_status():
+    is_database_working = True
+    output = 'database is ok'
+    try:
+        db.session.execute('SELECT 1')
+    except Exception as e:
+        output = str(e)
+        is_database_working = False
+    return is_database_working, output

requirements.txt

@@ -11,6 +11,7 @@ marshmallow-enum
 psycopg2-binary
 flask_minio
 sentry-sdk
+py-healthcheck
 
 cython