114 lines
5.6 KiB
Python
114 lines
5.6 KiB
Python
"""This module contains the RestAdapter class, which is used to make requests to the Zipline server."""""
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import logging
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from typing import Dict
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from json import JSONDecodeError
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import requests
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from urllib3 import disable_warnings
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from pyzipline.exceptions import HTTPFailure, PyZiplineError
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from pyzipline.models import Result
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class RestAdapter:
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"""Constructor for RestAdapter
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Args:
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hostname (str): The hostname of your Zipline instance, WITHOUT https or http.
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token (str = None): String used for authentication when making requests.
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ssl (bool = True): Normally set to True, but if your Zipline instance doesn't use SSL/TLS, set this to False.
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enforced_signing (bool = True): Normally set to True, but if having SSL/TLS cert validation issues, can turn off with False.
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logger (logging.Logger = None): If your app has a logger, pass it in here.
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Raises:
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ValueError: Raised when the keyword arguments passed to the class constructor conflict.
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"""
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def __init__(self, hostname: str, token: str = '', ssl: bool = True, enforced_signing: bool = True, logger: logging.Logger = None):
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self._url = f"http{'s' if ssl else ''}://{hostname}/api/"
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self._token = token
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self._ssl = ssl
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self._enforced_signing = enforced_signing
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self._logger = logger or logging.getLogger(__name__)
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if ssl is False and enforced_signing is True:
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raise ValueError("Cannot enforce signing without SSL")
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if not ssl and not enforced_signing:
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disable_warnings()
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def _do(self, http_method: str, endpoint: str, params: Dict = None, data: Dict = None, timeout: float = 60) -> Result:
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"""Internal method to make a request to the Zipline server. You shouldn't use this directly.
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Args:
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http_method (str): The HTTP method to use (GET, POST, DELETE)
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endpoint (str): The endpoint to make the request to.
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params (Dict = None): Python dictionary of query parameters to send with the request.
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data (Dict = None): Python dictionary of data to send with the request.
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timeout (float = 60): Number of seconds to wait for the request to complete.
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Returns:
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Result: A Result object containing the status code, message, and data from the request.
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Raises:
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HTTPError: Raised when an HTTP request fails.
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PyZiplineError: Raised when an error occurs in the PyZipline library.
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"""
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full_url = self._url + endpoint
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headers = {'Authorization': self._token}
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try: # Perform an HTTP request, catching and re-raising any exceptions
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# will eventually refactor this to use asyncio/aiohttp instead for async operation
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response = requests.request(method=http_method, url=full_url, verify=self._enforced_signing, params=params, headers=headers, json=data, timeout=timeout)
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except requests.exceptions.RequestException as e:
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self._logger.error(msg=str(e))
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raise HTTPFailure("Could not connect to Zipline server") from e
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try: # Deserialize JSON output to Python object, or return failed Result on exception
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data_out = response.json()
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except (ValueError, JSONDecodeError) as e:
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raise PyZiplineError("Could not decode response from Zipline server") from e
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# If status_code in 200-299 range, return success Result with data, otherwise return failed Result with message
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is_success = 299 >= response.status_code >= 200
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if is_success:
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return Result(success=is_success, status_code=response.status_code, message=response.reason, data=data_out)
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return Result(success=is_success, status_code=response.status_code, message=data_out['error'], data=data_out)
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def get(self, endpoint: str, params: Dict = None) -> Result:
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"""Make a GET request to the Zipline server. You should almost never have to use this directly.
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Args:
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endpoint (str): The endpoint to make the request to.
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params (Dict = None): Python dictionary of query parameters to send with the request.
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Returns:
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Result: A Result object containing the status code, message, and data from the request.
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"""
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return self._do(http_method='GET', endpoint=endpoint, params=params)
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def post(self, endpoint: str, params: Dict = None, data: Dict = None) -> Result:
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"""Make a POST request to the Zipline server. You should almost never have to use this directly.
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Args:
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endpoint (str): The endpoint to make the request to.
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params (Dict = None): Python dictionary of query parameters to send with the request.
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data (Dict = None): Python dictionary of data to send with the request.
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Returns:
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Result: A Result object containing the status code, message, and data from the request.
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"""
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return self._do(http_method='POST', endpoint=endpoint, params=params, data=data)
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def delete(self, endpoint: str, params: Dict = None, data: Dict = None) -> Result:
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"""Make a DELETE request to the Zipline server. You should almost never have to use this directly.
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Args:
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endpoint (str): The endpoint to make the request to.
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params (Dict = None): Python dictionary of query parameters to send with the request.
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data (Dict = None): Python dictionary of data to send with the request.
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Returns:
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Result: A Result object containing the status code, message, and data from the request.
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"""
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return self._do(http_method='DELETE', endpoint=endpoint, params=params, data=data)
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