def __init__(self, adapter_name):
cbLogs.info("Initializing AdapterLibrary with adapter name: " + adapter_name)
self.adapter_name = adapter_name
self._args = {}
self._cb_system = None
self._device_client = None
self._sub_topic = None
self._cb_message_handler = None
def __parse_env_variables(self):
"""Parse environment variables"""
env = os.environ
possible_vars = [self.SYSTEM_KEY_ARG_KEY, self.SYSTEM_SECRET_ARG_KEY, self.SERVICE_ACCOUNT_ARG_KEY, self.SERVICE_ACCOUNT_TOKEN_ARG_KEY]
for var in possible_vars:
if var in env:
cbLogs.info("Setting adapter arguments from environment variable: " + var + ": " + str(env[var]))
self._args[var] = env[var]
def connect_MQTT(self, topic="", cb_message_handler=None):
cbLogs.info("AdapterLibrary - connect_MQTT - Initializing the ClearBlade MQTT message broker")
self._cb_message_handler = cb_message_handler
self._cb_mqtt = self._cb_system.Messaging(self._device_client, client_id=self.adapter_name + "-" + str(random.randint(0, 10000)))
self._cb_mqtt.on_connect = self.__on_MQTT_connect
self._cb_mqtt.on_disconnect = self.__on_MQTT_disconnect
if topic != "":
self._cb_mqtt.on_subscribe = self.__on_MQTT_subscribe
self._cb_mqtt.on_message = self.__on_MQTT_message_received
self._sub_topic = topic
self._cb_mqtt.connect()
def initialize_clearblade(self):
cbLogs.info("AdapterLibrary - initialize_clearblade - initializing with ClearBlade")
self._cb_system = System(self._args[self.SYSTEM_KEY_ARG_KEY], self._args[self.SYSTEM_SECRET_ARG_KEY], self._args[self.PLATFORM_URL_ARG_KEY])
if self.SERVICE_ACCOUNT_ARG_KEY in self._args:
self.__auth_with_service_account()
else:
self.__auth_with_device()
return self.__fetch_adapter_config()
def __byteify(self, input):
cbLogs.info("in byteify")
# helper function for python 2.7 to convert unicode to strings in a dict created with json.loads
# https://stackoverflow.com/a/13105359
if isinstance(input, dict):
return {self.__byteify(key): self.__byteify(value)
for key, value in input.iteritems()}
elif isinstance(input, list):
return [self.__byteify(element) for element in input]
elif isinstance(input, unicode):
return input.encode('utf-8')
else:
return input
def __parse_flags(self):
"""Parse the command line arguments"""
parser = argparse.ArgumentParser(description='ClearBlade Adapter')
parser.add_argument('--systemKey', dest=self.SYSTEM_KEY_ARG_KEY, help='The System Key of the ClearBlade \
Plaform "System" the adapter will connect to.')
parser.add_argument('--systemSecret', dest=self.SYSTEM_SECRET_ARG_KEY, help='The System Secret of the \
ClearBlade Plaform "System" the adapter will connect to.')
parser.add_argument('--deviceName', dest=self.DEVICE_NAME_ARG_KEY, default=self.adapter_name, help='The name of the device that will be used for device \
authentication against the ClearBlade Platform or Edge, defined \
within the devices table of the ClearBlade platform. The default is ' + self.adapter_name)
parser.add_argument('--password', dest=self.ACTIVE_KEY_ARG_KEY, help='The password (active key) of the device that will be used for device \
authentication against the ClearBlade Platform or Edge, defined within \
the devices table of the ClearBlade platform.')
parser.add_argument('--platformURL', dest=self.PLATFORM_URL_ARG_KEY, default=self.DEFAULT_PLATFORM_URL, \
help='The HTTP URL of the ClearBlade Platform or Edge the adapter will \
connect to (including port if non-standard). The default is ' + self.DEFAULT_PLATFORM_URL)
parser.add_argument('--messagingURL', dest=self.MESSAGING_URL_ARG_KEY, default=self.DEFAULT_MESSAGING_URL, \
help='The MQTT URL of the ClearBlade Platform or Edge the adapter will \
connect to (including port if non-standard). The default is ' + self.DEFAULT_MESSAGING_URL)
parser.add_argument('--adapterConfigCollection', dest=self.ADAPTER_CONFIG_COLLECTION_NAME_ARG_KEY, \
default=self.DEFAULT_ADAPTER_CONFIG_COLLECTION_NAME, \
help='The name of the ClearBlade Platform data collection which contains \
runtime configuration settings for the adapter. The default is ' + self.DEFAULT_ADAPTER_CONFIG_COLLECTION_NAME)
parser.add_argument('--logLevel', dest=self.LOG_LEVEL_ARG_KEY, default=self.DEFAULT_LOG_LEVEL, choices=['fatal', 'error', \
'warn', 'info', 'debug'], help='The level of logging that \
should be utilized by the adapter. The default is ' + self.DEFAULT_LOG_LEVEL)
args = vars(parser.parse_args(args=sys.argv[1:]))
for var in args:
if args[var] != "" and args[var] != None:
cbLogs.info("Setting adapter arguments from command line argument: " + var + ": " + str(args[var]))
self._args[var] = args[var]
def __fetch_adapter_config(self):
cbLogs.info("AdapterLibrary - __fetch_adapter_config - Retrieving adapter config")
adapter_config = {"topic_root": self.adapter_name, "adapter_settings": ""}
collection = self._cb_system.Collection(self._device_client, collectionName=self._args[self.ADAPTER_CONFIG_COLLECTION_NAME_ARG_KEY])
query = Query()
query.equalTo("adapter_name", self.adapter_name)
rows = collection.getItems(query)
if len(rows) == 1:
if rows[0]["topic_root"] != "":
adapter_config["topic_root"] = str(rows[0]["topic_root"])
if rows[0]["adapter_settings"] != "":
raw_json = json.loads(str(rows[0]["adapter_settings"]))
adapter_config["adapter_settings"] = self.__byteify(raw_json)
else:
cbLogs.warn("No adapter config found for adapter name " + self.adapter_name + ". Using defaults")
cbLogs.info("AdapterLibrary - __fetch_adapter_config - Using adapter config: " + str(adapter_config))
return adapter_config
def parse_arguments(self):
cbLogs.info("AdapterLibrary - parse_arguments - parsing environment variables and flags")
self.__parse_env_variables()
self.__parse_flags()
self._args[self.LOG_LEVEL_ARG_KEY] = string.upper(self._args[self.LOG_LEVEL_ARG_KEY])
logging.basicConfig(level=self._args[self.LOG_LEVEL_ARG_KEY])
if self._args[self.LOG_LEVEL_ARG_KEY] != "DEBUG":
cbLogs.DEBUG = False
cbLogs.MQTT_DEBUG = False
cbLogs.info("AdapterLibrary - parse_arguments - parsed adapter arguments: " + str(self._args))
cbLogs.info("AdapterLibrary - parse_arguments - Verifying required adapter arguments")
if self.SYSTEM_KEY_ARG_KEY not in self._args:
cbLogs.error("System Key is required, can be supplied with --systemKey flag or " + self.SYSTEM_KEY_ARG_KEY + " environment variable")
exit(-1)
if self.SYSTEM_SECRET_ARG_KEY not in self._args:
cbLogs.error("System Secret is required, can be supplied with --systemSecret flag or " + self.SYSTEM_SECRET_ARG_KEY + " environment variable")
exit(-1)
if self.ACTIVE_KEY_ARG_KEY not in self._args and self.SERVICE_ACCOUNT_ARG_KEY not in self._args:
cbLogs.error("Device Password is required when not using a Service Account, can be supplied with --password flag")
exit(-1)
if self.SERVICE_ACCOUNT_ARG_KEY in self._args and self.SERVICE_ACCOUNT_TOKEN_ARG_KEY not in self._args:
cbLogs.error("Service Account Token is required when a Service Account is specified, this should have automatically been supplied. Check for typos then try again")
exit(-1)
cbLogs.info("AdapterLibrary - parse_arguments - Adapter arguments parsed and verified!")
def __auth_with_device(self):
cbLogs.info("AdapterLibrary - __auth_with_device - Authenticating as device")
self._device_client = self._cb_system.Device(self._args[self.DEVICE_NAME_ARG_KEY], self._args[self.ACTIVE_KEY_ARG_KEY])
def __auth_with_service_account(self):
cbLogs.info("AdapterLibrary - __auth_with_service_account - Authenticating as service account")
self._device_client = self._cb_system.Device(self._args[self.SERVICE_ACCOUNT_ARG_KEY], authToken=self._args[self.SERVICE_ACCOUNT_TOKEN_ARG_KEY])
def disconnect_MQTT(self):
cbLogs.info("AdapterLibrary - disconnect_MQTT - Disconnecting from ClearBlade MQTT message broker")
self._cb_mqtt.disconnect()
def publish(self, topic, message):
cbLogs.info("AdapterLibrary - publish - Publishing MQTT message on topic " + topic)
self._cb_mqtt.publish(topic, message)
def __on_MQTT_message_received(self, client, userdata, message):
cbLogs.info("AdapterLibrary - __on_MQTT_message_received - MQTT message received on topic " + message.topic)
if self._cb_message_handler != None:
cbLogs.info("calling message handler")
self._cb_message_handler(message)
def __on_MQTT_subscribe(self, client, userdata, mid, granted_qos):
cbLogs.info("AdapterLibrary - __on_MQTT_subscribe - MQTT successfully subcribed to topic " + self._sub_topic)
def __on_MQTT_disconnect(self, client, userdata, rc):
cbLogs.info("AdapterLibrary - __on_MQTT_disconnect - MQTT disconnected with rc " + str(rc))
if self._sub_topic != None and rc == 1:
cbLogs.warn("AdapterLibrary - __on_MQTT_disconnect - Verify that your service account has permission to subscribe to the topic: " + self._sub_topic)
def __on_MQTT_connect(self, client, userdata, flags, rc):
cbLogs.info("AdapterLibrary - __on_MQTT_connect - MQTT successfully connected!")
if self._sub_topic != None:
self._cb_mqtt.subscribe(self._sub_topic)
