uWSGI example config provided

Example uWSGI, application and systemd service configuraion files
added.
Logging configuration added into build_app. Logging configuration
is disabled for tests.

Change-Id: Iff6e5e7065d513caf48f272f7e49794d2ac53d0b
Closes-Bug: #1583134

examples/etc/tuningbox/tuningbox_config.py

@@ -0,0 +1,4 @@
+LOG_LEVEL = 'DEBUG'
+
+SQLALCHEMY_DATABASE_URI = \
+    'postgresql://tuningbox:tuningbox@localhost/tuningbox'

examples/etc/tuningbox/uwsgi_tuningbox.yaml

@@ -0,0 +1,8 @@
+uwsgi:
+    socket: :8082
+    protocol: http
+    module: tuning_box.app:build_app()
+    pythonpath: %d../../..
+    env: TUNINGBOX_SETTINGS=%d/tuningbox_config.py
+#    logto: /var/log/tuningbox/tuningbox.log
+#    pid: /var/run/tuningbox.pid

examples/lib/systemd/system/tuningbox.service

@@ -0,0 +1,12 @@
+[Unit]
+Name=Tunigbox service
+ConditionPathExists=/etc/tuningbox/uwsgi_tuningbox.yaml
+
+[Service]
+ExecStart=/usr/sbin/uwsgi -y /etc/tuningbox/uwsgi_tuningbox.yaml
+ExecReload=/usr/sbin/uwsgi --reload /var/run/tuningbox.pid
+ExecStop=/usr/sbin/uwsgi --stop /var/run/tuningbox.pid
+ExecStopPost=/usr/bin/rm -f /var/run/tuningbox.pid
+
+[Install]
+WantedBy=multi-user.target

tuning_box/app.py

@@ -21,6 +21,7 @@ from werkzeug import exceptions
 
 from tuning_box import converters
 from tuning_box import db
+from tuning_box import logger
 
 # These handlers work if PROPAGATE_EXCEPTIONS is off (non-Nailgun case)
 api_errors = {
@@ -290,7 +291,7 @@ def handle_integrity_error(exc):
     return response
 
 
-def build_app():
+def build_app(configure_logging=True):
     app = flask.Flask(__name__)
     app.url_map.converters.update(converters.ALL)
     api.init_app(app)  # init_app spoils Api object if app is a blueprint
@@ -300,6 +301,9 @@ def build_app():
     # These handlers work if PROPAGATE_EXCEPTIONS is on (Nailgun case)
     app.register_error_handler(sa_exc.IntegrityError, handle_integrity_error)
     db.db.init_app(app)
+    if configure_logging:
+        log_level = app.config.get('LOG_LEVEL', 'INFO')
+        logger.init_logger(log_level)
     return app
 
 

tuning_box/logger.py

@@ -0,0 +1,28 @@
+# 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 logging
+
+
+def get_formatter():
+    date_format = "%Y-%m-%d %H:%M:%S"
+    log_format = "%(asctime)s.%(msecs)03d %(levelname)s " \
+                 "(%(module)s) %(message)s"
+    return logging.Formatter(fmt=log_format, datefmt=date_format)
+
+
+def init_logger(log_level):
+    handler = logging.StreamHandler()
+    handler.setFormatter(get_formatter())
+    logger = logging.getLogger()
+    logger.addHandler(handler)
+    logger.setLevel(log_level)

tuning_box/tests/test_app.py

@@ -43,7 +43,7 @@ class Client(testing.FlaskClient):
 class TestApp(base.TestCase):
     def setUp(self):
         super(TestApp, self).setUp()
-        self.app = app.build_app()
+        self.app = app.build_app(configure_logging=False)
         self.app.config["SQLALCHEMY_DATABASE_URI"] = 'sqlite:///'
         with self.app.app_context():
             db.fix_sqlite()