/
api.py
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/
api.py
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import mongoengine
import pika
import simplejson as json
import time
from datetime import datetime
from flask import current_app as app
from flask import Blueprint, request
import utils
from models import models
api = Blueprint('api', __name__, template_folder='templates')
def _build_error(error_code, message):
return {"status_code": error_code, "data": message}
def _get_request_args(**kwargs):
args = dict(request.args)
for key, value in args.items():
converter = kwargs[key]
if isinstance(value, list):
args[key] = [converter(item) for item in value]
else:
args[key] = converter(value)
return args
@api.route('/api/devices', methods=['GET'])
def list_devices():
devices = models.Device.objects.order_by('-last_updated')
devices = [d.to_dict() for d in devices]
return utils.make_json_response(200, devices)
@api.route('/api/devices/<string:device_id>', methods=['GET'])
def get_device_info(device_id):
device, error = _get_device_by_id(device_id)
if error:
return utils.make_json_response(**error)
return utils.make_json_response(200, device.to_dict())
@api.route('/api/devices', methods=['POST'])
def register_device():
data = utils.get_request_data()
device = models.Device()
try:
device.name = data['name']
except KeyError:
return utils.make_json_response(
400,
"Error registering device: device name not found."
)
device.last_updated = datetime.now()
try:
device.save()
except mongoengine.errors.NotUniqueError as e:
return utils.make_json_response(409, str(e))
return utils.make_json_response(200, device.to_dict())
@api.route('/api/devices/<string:device_id>', methods=['DELETE'])
def unregister_device(device_id):
device, error = _get_device_by_id(device_id)
if error:
return utils.make_json_response(**error)
device_name = device.name
device.delete()
return utils.make_json_response(
200,
{"name": device_name, "status": "deleted"}
)
@api.route('/api/run_function', methods=['POST'])
def run_function():
data = utils.get_request_data()
device = _select_device()
if not device:
return utils.make_json_response(
400,
"Bad Request: No device available."
)
code, status = _send_function_trigger(device.name, data)
if code == 200:
device.last_triggered = datetime.now()
device.save()
return utils.make_json_response(code, status)
def _select_device():
devices = models.Device.objects.order_by('-last_triggered')
if not devices:
return None
selected_device = devices[len(devices) - 1]
return selected_device
def _send_function_trigger(device_name, data):
connection = pika.BlockingConnection(
pika.ConnectionParameters(host=app.config['RABBIT_HOST'], port=5672)
)
channel = connection.channel()
channel.queue_declare(queue=device_name)
payload = json.dumps(data)
channel.basic_publish(exchange='',
routing_key=device_name,
body=payload)
connection.close()
return 200, "function triggered."
def _get_device_by_id(device_id):
try:
device = models.Device.objects.get(id=device_id)
except mongoengine.errors.ValidationError as e:
return None, _build_error(400, e.__str__())
except models.Device.DoesNotExist as e:
return None, _build_error(404, e.__str__())
return device, None