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config.py
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config.py
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#!/usr/bin/python
"""
This file acts as the basic configuration generation utility that lets
the end user setup the basic setup required to run this demo app.
This applications requires the following resources to be there or the
settings will be defaulted to match the requirements to run this app
on the local machine instead of the Predix.io Cloud ENV.
"""
# Import Library Requirements.
import os
import json
# Lets define some global variable for safety.
CONFIG_FILE = "./config/config.json"
CONFIG_DICT = dict()
def __check_file(file_name):
"""
This function acts as a fail-safe to make sure that the a file
exists. This can come in handy when trying to read data from
the configuration files.
@:parameter
file_name - File to Check
@:return
True - Exists
False - Doesn't Exist
"""
if os.path.isfile(file_name):
return True
else:
return False
def __parse_config_file(file_name):
"""
This function is used to Read and parse the configuration file if
for some reason, I fail to obtain some required parameters from
the OS' environment variable.
@:parameter
file_name - Input JSON file to Reas
@:return
json_data - Dictionary of JSON data from Python
"""
with open(file_name) as data:
json_data = json.load(data)
return json_data
def get_rest_information(instance_type="prod"):
"""
This function is used to return the RestFul service information
back to the Flask App initiator so that the Flask Server can be
started on the Port and the Host specified by the User.
We make use of the ENV File and the Configuration file in order
to perform this operation.
@:parameter:
instance_type - Parameter used to Identify the Run Mode.
Defaults to Prod.
@:returns:
host_name - Host Name that needs to be used to run Flask
port_number - Port on which the Flask Application must run
debug - Enable or Disable Debug Mode based on ENV
"""
port_number = 9099
host_name = "0.0.0.0"
debug = False
global CONFIG_DICT
global CONFIG_FILE
if __check_file(CONFIG_FILE):
CONFIG_DICT = __parse_config_file(CONFIG_FILE)
if instance_type == "prod":
if os.getenv("PORT") is not None:
port_number = int(os.getenv("PORT"))
elif CONFIG_DICT.get("port") is not None:
port_number = int(CONFIG_DICT.get("port"))
else:
port_number = 9099
if os.getenv("HOST_NAME") is not None:
host_name = os.getenv("HOST_NAME")
if os.getenv("DEBUG") is not None:
if os.getenv("DEBUG"):
debug = True
if CONFIG_DICT.get("debug") is not None:
if CONFIG_DICT.get("debug"):
debug = True
else:
if __check_file(CONFIG_FILE):
CONFIG_DICT = __parse_config_file(CONFIG_FILE)
if CONFIG_DICT.get("port") is not None:
port_number = int(CONFIG_DICT.get("port"))
else:
port_number = 9099
else:
port_number = 9099
if os.getenv("DEBUG") is not None:
if os.getenv("DEBUG"):
debug = True
if CONFIG_DICT.get("debug") is not None:
if CONFIG_DICT.get("debug"):
debug = True
return host_name, port_number, debug
def get_rabbit_mq_config():
"""
This function serves up the RabbitMQ Message Queue related settings
on a platter to the end user.
These settings are essential in establishing a connection to the MQs
in the Predix.io machine for making use of them in the code base.
@:returns
host_name - RabbitMQ Host Name Identifier.
message_queue_name - Name of the message Queue to to be used.
This needs to Pre-exist in RabbitMQ.
"""
host_name = "localhost"
message_queue_name = "pq"
global CONFIG_DICT
if CONFIG_DICT.get("rabbitmq") is not None:
host_name = CONFIG_DICT.get("rabbitmq").get("hostname")
message_queue_name = CONFIG_DICT.get(
"rabbitmq").get("message_queue_name")
if 'VCAP_SERVICES' in os.environ:
if os.environ.get('VCAP_SERVICES') is not None \
and json.loads(os.environ.get(
"VCAP_SERVICES")).get("p-rabbitmq-35") is not None:
VCAP_SERVICES = json.loads(os.environ.get("VCAP_SERVICES"))
rabbit_mq = VCAP_SERVICES.get("p-rabbitmq-35")
if rabbit_mq[0].get("credentials") is not None \
and rabbit_mq[0].get(
"credentials").get("amqp") is not None:
ampq = rabbit_mq[0].get("credentials").get("amqp")
if ampp.get("host") is not None:
host_name = ampq.get("host")
return host_name, message_queue_name
def get_redis_config():
"""
This function is used to serve-up the Redis Settings to the enduser.
This is required to setup an in Memory Cache system that can be used
in conjunction with Postgresql for faster in memory processing and
quick turn around read time for data processing.
This is never to be used as a data storage system since this is only
an In-memory system.
@:returns
hostname - Redis machine host name to be used for connecting
port - Redis Port to use for Connection
password - Password Field to be used for connection.
"""
hostname = "localhost"
port = 6379
password = ''
global CONFIG_DICT
if CONFIG_DICT.get("redis") is not None:
hostname = CONFIG_DICT.get("redis").get("hostname")
port = CONFIG_DICT.get("redis").get("port")
password = CONFIG_DICT.get("redis").get("password")
if 'VCAP_SERVICES' in os.environ:
VCAP_SERVICES = json.loads(os.environ.get("VCAP_SERVICES"))
if VCAP_SERVICES is not None \
and VCAP_SERVICES.get("redis-3") is not None:
redis = VCAP_SERVICES.get("redis-3")[0]
if redis.get("credentials") is not None:
hostname = redis.get("credentials").get("host", "localhost")
port = redis.get("credentials").get("port", 6379)
password = redis.get("credentials").get("password", '')
return hostname, port, password
def get_postgresql_config():
"""
This function checks through each items in the ENV Variable, Config
file as well as the Custom Default items in order to return the
parameters required to set up a PostgreSQL connection.
@:returns
database - Database to Use as Default.
user - User name for invoking connection.
password - Password to Establish PostgreSQL connection
host - Host Name to use
port - Connection port for PostgreSQL.
"""
database = "test"
user = "postgres"
password = "password"
host = "127.0.0.1"
port = "4532"
global CONFIG_DICT
if CONFIG_DICT.get("postgres") is not None:
database = CONFIG_DICT.get("postgres").get("database")
user = CONFIG_DICT.get("postgres").get("user")
password = CONFIG_DICT.get("postgres").get("password")
host = CONFIG_DICT.get("postgres").get("host")
port = CONFIG_DICT.get("postgres").get("port")
if "VCAP_SERVICES" in os.environ:
VCAP_SERVICES = json.loads(os.environ.get("VCAP_SERVICES"))
if VCAP_SERVICES is not None \
and VCAP_SERVICES.get("postgres") is not None:
postgres = VCAP_SERVICES.get("postgres")[0]
if postgres.get("credentials") is not None:
database = postgres.get("credentials").get("database")
user = postgres.get("credentials").get("username")
password = postgres.get("credentials").get("password")
host = postgres.get("credentials").get("host")
port = postgres.get("credentials").get("port")
return database, user, password, host, port
def get_amqp_config():
"""
This function is used to obtain the AMPQ URI handler that is required
by nameko micro-services api to handle the Incoming data request and
return the data accordingly in an Async manner.
"""
URL = 'amqp://guest:guest@localhost/'
global CONFIG_DICT
if CONFIG_DICT.get("amqp_uri") is not None:
URL = CONFIG_DICT.get("amqp_uri")
if "VCAP_SERVICES" in os.environ:
VCAP_SERVICES = json.loads(os.environ.get("VCAP_SERVICES"))
if VCAP_SERVICES is not None \
and VCAP_SERVICES.get("p-rabbitmq-35") is not None:
RMQ = VCAP_SERVICES.get("p-rabbitmq-35")
if RMQ is not None and RMQ[0] is not None:
CREDS = RMQ[0]['credentials']
if CREDS and CREDS.get('protocols') is not None:
PROT = CREDS.get('protocols')
if PROT is not None and \
PROT.get('amqp') is not None:
URL = PROT.get('amqp').get('uri')
return URL