/
endpoints.py
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/
endpoints.py
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import inspect
import json
from collections import OrderedDict
from aiohttp.http_exceptions import HttpBadRequest
from aiohttp.web import Request, Response
from aiohttp.web_exceptions import HTTPMethodNotAllowed
from aiohttp.web_urldispatcher import UrlDispatcher
from models import Employee, Car, Part, session
__version__ = '0.1.0'
DEFAULT_METHODS = ('GET', 'POST', 'PUT', 'PATCH', 'DELETE')
class RestEndpoint:
def __init__(self):
self.methods = {}
for method_name in DEFAULT_METHODS:
method = getattr(self, method_name.lower(), None)
if method:
self.register_method(method_name, method)
def register_method(self, method_name, method):
self.methods[method_name.upper()] = method
async def dispatch(self, request: Request):
method = self.methods.get(request.method.upper())
if not method:
raise HTTPMethodNotAllowed('', DEFAULT_METHODS)
wanted_args = list(inspect.signature(method).parameters.keys())
available_args = request.match_info.copy()
available_args.update({'request': request})
unsatisfied_args = set(wanted_args) - set(available_args.keys())
if unsatisfied_args:
# Expected match info that doesn't exist
raise HttpBadRequest('')
return await method(**{arg_name: available_args[arg_name] for arg_name in wanted_args})
class EmployeeEndpoint(RestEndpoint):
"""
Employee API endpoint class
"""
def __init__(self, resource):
super().__init__()
self.resource = resource
async def response_200(self, response_data):
print(response_data)
for i in response_data:
print(i)
return Response(status=200, body=self.resource.encode({
'employees': [
{'id': emp.id,
'name': emp.name,
'surname': emp.surname,
'sex': emp.sex}
for emp in response_data
]
}), content_type='application/json')
async def get(self, request) -> Response:
query = request.rel_url.query
instance = None
if query.get('id'):
id = query.get('id', '')
instance = session.query(Employee).filter(Employee.id == id)
if query.get('name'):
name = query.get('name', '')
instance = session.query(Employee).filter(Employee.name == name)
if query.get('surname'):
surname = query.get('surname', '')
instance = session.query(Employee).filter(Employee.surname == surname)
if query.get('sex'):
sex = query.get('sex', '')
instance = session.query(Employee).filter(Employee.sex == sex)
if not instance:
return await self.response_200(response_data=session.query(Employee))
elif instance.count() == 0:
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
else:
return await self.response_200(response_data=instance)
async def post(self, request):
data = await request.post()
employee = Employee(name=data.get('name'), surname=data.get('surname'), sex=data.get('sex'))
session.add(employee)
session.commit()
return await self.response_200(response_data=session.query(Employee))
async def put(self, request):
id = request.rel_url.query.get('id', '')
if not session.query(Employee).filter(Employee.id == id).first():
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
data = await request.post()
emp = session.query(Employee).filter(Employee.id == id).first()
emp.name = data.get('name')
emp.surname = data.get('surname')
emp.sex = data.get('sex')
session.add(emp)
session.commit()
return await self.response_200(response_data=session.query(Employee))
async def patch(self, request):
id = request.rel_url.query.get('id', '')
if not session.query(Employee).filter(Employee.id == id).first():
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
data = await request.post()
emp = session.query(Employee).filter(Employee.id == id).first()
emp.name = data.get('name') or emp.name
emp.surname = data.get('surname') or emp.surname
emp.sex = data.get('sex') or emp.sex
return await self.response_200(response_data=session.query(Employee))
async def delete(self, request):
id = request.rel_url.query.get('id', '')
employee = session.query(Employee).filter(Employee.id == id).first()
if not employee:
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
session.delete(employee)
session.commit()
return Response(status=204)
class CarEndpoint(RestEndpoint):
"""
Car API endpoint class
"""
def __init__(self, resource):
super().__init__()
self.resource = resource
async def response_200(self, response_data):
return Response(status=200, body=self.resource.encode({
'cars': [
{'id': car.id,
'model': car.model,
'year': car.year}
for car in response_data
]
}), content_type='application/json')
async def get(self, request) -> Response:
query = request.rel_url.query
instance = None
if query.get('id'):
id = query.get('id', '')
instance = session.query(Car).filter(Car.id == id)
if query.get('model'):
model = query.get('model', '')
instance = session.query(Car).filter(Car.model == model)
if query.get('year'):
year = query.get('year', '')
instance = session.query(Car).filter(Car.year == year)
if not instance:
return await self.response_200(response_data=session.query(Car))
elif instance.count() == 0:
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
else:
return await self.response_200(response_data=instance)
async def post(self, request):
data = await request.post()
car = Car(model=data.get('model'), year=data.get('year'))
session.add(car)
session.commit()
return await self.response_200(response_data=session.query(Car))
async def put(self, request):
id = request.rel_url.query.get('id', '')
if not session.query(Car).filter(Car.id == id).first():
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
data = await request.post()
car = session.query(Car).filter(Car.id == id).first()
car.model = data.get('model')
car.year = data.get('year')
session.add(car)
session.commit()
return await self.response_200(response_data=session.query(Car))
async def patch(self, request):
id = request.rel_url.query.get('id', '')
if not session.query(Car).filter(Car.id == id).first():
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
data = await request.post()
car = session.query(Car).filter(Car.id == id).first()
car.model = data.get('model') or car.model
car.year = data.get('year') or car.year
return await self.response_200(response_data=session.query(Car))
async def delete(self, request):
id = request.rel_url.query.get('id', '')
car = session.query(Car).filter(Car.id == id).first()
if not car:
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
session.delete(car)
session.commit()
return Response(status=204)
class PartEndpoint(RestEndpoint):
"""
Part API endpoint class
"""
def __init__(self, resource):
super().__init__()
self.resource = resource
async def response_200(self, response_data):
return Response(status=200, body=self.resource.encode({
'parts': [
{'id': part.id,
'name': part.name,
'country': part.country,
'model': part.model}
for part in response_data
]
}), content_type='application/json')
async def get(self, request) -> Response:
query = request.rel_url.query
instance = None
if query.get('id'):
id = query.get('id', '')
instance = session.query(Part).filter(Part.id == id)
if query.get('name'):
name = query.get('name', '')
instance = session.query(Part).filter(Part.name == name)
if query.get('country'):
country = query.get('country', '')
instance = session.query(Part).filter(Part.country == country)
if query.get('model'):
model = query.get('model', '')
instance = session.query(Part).filter(Part.model == model)
if not instance:
return await self.response_200(response_data=session.query(Part))
elif instance.count() == 0:
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
else:
return await self.response_200(response_data=instance)
async def post(self, request):
data = await request.post()
part = Part(name=data.get('name'), country=data.get('country'), model=data.get('model'))
session.add(part)
session.commit()
return await self.response_200(response_data=session.query(Part))
async def put(self, request):
id = request.rel_url.query.get('id', '')
if not session.query(Part).filter(Part.id == id).first():
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
data = await request.post()
emp = session.query(Part).filter(Part.id == id).first()
emp.name = data.get('name')
emp.country = data.get('country')
emp.model = data.get('model')
session.add(emp)
session.commit()
return await self.response_200(response_data=session.query(Part))
async def patch(self, request):
id = request.rel_url.query.get('id', '')
if not session.query(Part).filter(Part.id == id).first():
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
data = await request.post()
part = session.query(Part).filter(Part.id == id).first()
part.name = data.get('name') or part.name
part.country = data.get('country') or part.country
part.model = data.get('model') or part.model
return await self.response_200(response_data=session.query(Part))
async def delete(self, request):
id = request.rel_url.query.get('id', '')
part = session.query(Part).filter(Part.id == id).first()
if not part:
return Response(status=404, body=json.dumps({'not found': 404}), content_type='application/json')
session.delete(part)
session.commit()
return Response(status=204)
class RestResource:
def __init__(self, employees, cars, parts, properties, id_field):
self.employees = employees
self.cars = cars
self.parts = parts
self.properties = properties
# self.id_field = id_field
self.employee_endpoint = EmployeeEndpoint(self)
self.car_endpoint = CarEndpoint(self)
self.part_endpoint = CarEndpoint(self)
def register(self, router: UrlDispatcher):
router.add_route('*', '/employees'.format(employees=self.employees), self.employee_endpoint.dispatch)
router.add_route('*', '/cars'.format(cars=self.cars), self.car_endpoint.dispatch)
router.add_route('*', '/parts'.format(parts=self.parts), self.part_endpoint.dispatch)
def render(self, instance):
return OrderedDict((data, getattr(instance, data)) for data in self.properties)
@staticmethod
def encode(data):
return json.dumps(data, indent=4).encode('utf-8')
def render_and_encode(self, instance):
return self.encode(self.render(instance))