Added base flask functions

Author: avara1986

pyms/constants.py

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+CONFIGMAP_FILE_ENVIRONMENT = "CONFIGMAP_FILE"
+
+LOGGER_NAME = "pyms"

pyms/exceptions.py

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+"""Exceptions of the lib. Its useful """
+
+
+class AttrDoesNotExistException(Exception):
+    pass
+
+
+class FileDoesNotExistException(Exception):
+    pass
+
+
+class ServiceDoesNotExistException(Exception):
+    pass
+
+
+class ConfigDoesNotFoundException(Exception):
+    pass

pyms/flask/__init__.py

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+import logging
+import os
+from typing import Text
+
+import connexion
+from flask_opentracing import FlaskTracer
+
+from pyms.config.conf import get_conf
+from pyms.flask.healthcheck import healthcheck_blueprint
+from pyms.logger import CustomJsonFormatter
+from pyms.tracer.main import init_jaeger_tracer
+
+
+class Microservice:
+    service = None
+
+    def __init__(self, service: Text, path=__file__):
+        self.service = service
+        self.path = os.path.dirname(path)
+
+    def create_app(self):
+        """Initialize the Flask app, register blueprints and initialize
+        all libraries like Swagger, database,
+        the trace system...
+        return the app and the database objects.
+        :return:
+        """
+        app = connexion.App(__name__, specification_dir=os.path.join(self.path, 'swagger'))
+        app.add_api('swagger.yaml',
+                    arguments={'title': 'Swagger Example project'}
+                    )
+
+        application = app.app
+        application.config.from_object(get_conf(service=self.service))
+
+        # Initialize Blueprints
+        application.register_blueprint(healthcheck_blueprint)
+
+        # Inject Modules
+        formatter = CustomJsonFormatter('(timestamp) (level) (name) (module) (funcName) (lineno) (message)')
+        if not application.config["TESTING"]:
+            log_handler = logging.StreamHandler()
+
+            tracer = FlaskTracer(init_jaeger_tracer(), True, application)
+            formatter.add_service_name(application.config["APP_NAME"])
+            formatter.add_trace_span(tracer)
+            log_handler.setFormatter(formatter)
+            application.logger.addHandler(log_handler)
+            application.logger.setLevel(logging.INFO)
+
+        return application

pyms/flask/app/utils.py

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+"""Init file
+"""
+from __future__ import unicode_literals, print_function, absolute_import, division
+
+from flask import Blueprint
+
+healthcheck_blueprint = Blueprint('healthcheck', __name__, static_url_path='/static')
+
+from pyms.flask.healthcheck import healthcheck

pyms/flask/healthcheck/__init__.py

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+"""Healthcheck
+"""
+from pyms.flask.healthcheck import healthcheck_blueprint
+
+
+@healthcheck_blueprint.route('/healthcheck', methods=['GET'])
+def healthcheck():
+    return "OK"