university-final-iot-backend/app/devices/__init__.py

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import sys
from flask import Blueprint
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from .models import Device, Recording, DeviceAssociation, DeviceType
from app import app
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devices_bp = Blueprint('devices', __name__)
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# Public interface
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def create_device(name, account_id, device_type=1):
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"""
Tries to create device with given parameters
:param name: Desired device name
:param device_type: Id of desired device type.
By default it is 1 (STANDARD)
:type name: string
:type device_type: int
:returns: True if device is successfully created
:rtype: Boolean
"""
device = Device(name, None, device_type)
device.save()
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device_association = DeviceAssociation(device.id, account_id)
device_association.save()
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def create_device_type(name):
"""
Tries to create device type with given parameters
:param name: Desired device type name
:type name: string
:returns: True if device type is successfully created
:rtype: Boolean
"""
device_type = DeviceType(name)
device_type.save()
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def set_device_configuration(device_id, configuration_json):
"""
Tries to update configuration of device with given id
:param device_id: Id of device to change configuration
:param configuration_json: New configuration
:type device_id: int
:type configuration_json: JSON
:rtype: Boolean
"""
from app.mqtt.mqtt_client import MqttClient
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device = Device.get(id=device_id)
device.configuration = configuration_json
device.save()
MqttClient.send_config(device_id, str(configuration_json))
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def get_device_configuration(device_id):
"""
Tries to get configuration for device with given parameters.
:param device_id: Id of device
:type device_id: int
:returns: Configuration of given device
:rtype: JSON Configuration
"""
return Device.get(id=device_id).configuration
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def get_device_recordings(device_id):
"""
Tries to get device recording for device with given parameters. Raises
error on failure
:param device_id: Id of device
:type device_id: int
:returns: List of Recordings for given device
:rtype: List of Recording
:raises: ValueError if device does not exist
"""
if not Device.exists(id=device_id):
raise ValueError("Device with id %s does not exist" % device_id)
return Recording.get_many(device_id=device_id)
def get_device(device_id):
"""
Tries to get device with given parameters. Raises error on failure
:param device_id: Id of device
:type device_id: int
:returns: Requested device
:rtype: Device
"""
return Device.get(id=device_id)
def can_user_access_device(account_id, device_id):
"""
Checks if user with given account_id can access device with given device_id
:param account_id: Id of account
:param device_id: Id of device
:type account_id: int
:type device_id: int
:returns: true if device is accessible by this account, false otherwise
:rtype: Boolean
"""
return len(DeviceAssociation.get_many(account_id=account_id,
device_id=device_id)) > 0
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def get_device_type(device_type_id):
"""
Tries to get device type with given parameters. Raises error on failure
:param device_type_id: Id of device type
:type device_type_id: int
:returns: Requested device type
:rtype: DeviceType
"""
return DeviceType.get(id=device_type_id)
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def delete_device(device_id):
"""
Tries to delete device with given parameters. Does not raise errors
"""
Device.get(id=device_id).delete()
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def get_devices(account_id):
"""
Tries to get all devices associated to account. Raises error on
failure
:returns: List of Devices associated to this account
:rtype: List of Devices
"""
return Device.get_many_for_user(account_id)
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def get_device_types():
"""
Tries to get all device types. Raises error on failure
:returns: List of device types
:rtype: List of DeviceTypes
"""
return DeviceType.get_many()
def create_recording(device_id, raw_json):
"""
Tries to create recording with given parameters. Raises error on failure
:param device_id: Id of device
:type device_id: int
:param raw_json: Raw json received
:type raw_json: json
:raises: ValueError if parsing fails or device does not exist
"""
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def parse_raw_json_recording(device_id, json_msg):
try:
return Recording(device_id=device_id,
record_type=json_msg["record_type"],
record_value=json_msg["record_value"],
recorded_at=json_msg["recorded_at"],
raw_json=json_msg)
except KeyError:
error_type, error_instance, traceback = sys.exc_info()
raise ValueError("JSON parsing failed! Key error: "
+ str(error_instance))
if not Device.exists(id=device_id):
raise ValueError("Device does not exist!")
recording = parse_raw_json_recording(device_id, raw_json)
with app.app_context():
recording.save()