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from __future__ import absolute_import |
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# python 3 vs 2 |
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try: |
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from urlparse import urljoin |
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except: |
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from urllib.parse import urljoin |
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from requests import Session |
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from requests.auth import HTTPBasicAuth |
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import json |
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from ._websocket import WebsocketHandler |
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# The subpath to the Create Read Update Delete portion of the API |
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CRUD_PATH = "crud/" |
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# Returned when the given credentials are not accepted by the server |
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class AuthenticationError(Exception): |
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def __init__(self, value): |
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self.value = value |
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def __str__(self): |
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return repr(self.value) |
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# Returned when the server gives an unhandled error code |
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class ServerError(Exception): |
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def __init__(self, value): |
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self.value = value |
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def __str__(self): |
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return repr(self.value) |
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class DatabaseConnection(object): |
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def __init__(self, user_or_apikey=None, user_password=None, url="https://connectordb.com"): |
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# Set up the API URL |
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if not url.startswith("http"): |
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url = "https://" + url |
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if not url.endswith("/"): |
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url = url + "/" |
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self.url = urljoin(url, "/api/v1/") |
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# Set up a session, which allows us to reuse connections |
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self.r = Session() |
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self.r.headers.update({'content-type': 'application/json'}) |
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# Prepare the websocket |
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self.ws = WebsocketHandler(self.url,None) |
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# Set the authentication if any |
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self.setauth(user_or_apikey,user_password) |
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def setauth(self,user_or_apikey=None, user_password=None): |
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""" setauth sets the authentication header for use in the session. |
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It is for use when apikey is updated or something of the sort, such that |
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there is a seamless experience. """ |
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auth = None |
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if user_or_apikey is not None: |
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# ConnectorDB allows login using both basic auth or an apikey url param. |
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# The python client uses basic auth for all logins |
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if user_password is None: |
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# Login by api key - the basic auth login uses "" user and apikey as password |
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user_password = user_or_apikey |
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user_or_apikey = "" |
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auth = HTTPBasicAuth(user_or_apikey, user_password) |
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self.r.auth = auth |
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# Set the websocket's authentication |
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self.ws.setauth(auth) |
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def close(self): |
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"""Closes the active connections to ConnectorDB""" |
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self.r.close() |
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def handleresult(self, r): |
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"""Handles HTTP error codes for the given request |
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Raises: |
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AuthenticationError on the appropriate 4** errors |
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ServerError if the response is not an ok (2**) |
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Arguments: |
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r -- The request result |
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""" |
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if r.status_code >= 400 and r.status_code < 500: |
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msg = r.json() |
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raise AuthenticationError(str(msg["code"]) + ": " + msg["msg"] + |
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" (" + msg["ref"] + ")") |
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elif r.status_code > 300: |
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err = None |
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try: |
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msg = r.json() |
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err = ServerError(str(msg["code"]) + ": " + msg["msg"] + " (" + |
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msg["ref"] + ")") |
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except: |
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raise ServerError( |
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"Server returned error, but did not give a valid error message") |
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raise err |
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return r |
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def ping(self): |
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"""Attempts to ping the server using current credentials, and responds with the path of the currently |
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authenticated device""" |
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return self.handleresult(self.r.get(self.url, |
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params={"q": "this"})).text |
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def query(self, query_type, query=None): |
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"""Run the given query on the connection (POST request to /query)""" |
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return self.handleresult(self.r.post(urljoin(self.url + "query/", |
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query_type), |
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data=json.dumps(query))).json() |
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def create(self, path, data=None): |
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"""Send a POST CRUD API request to the given path using the given data which will be converted |
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to json""" |
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return self.handleresult(self.r.post(urljoin(self.url + CRUD_PATH, |
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path), |
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data=json.dumps(data))) |
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def read(self, path, params=None): |
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"""Read the result at the given path (GET) from the CRUD API, using the optional params dictionary |
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as url parameters.""" |
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return self.handleresult(self.r.get(urljoin(self.url + CRUD_PATH, |
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path), |
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params=params)) |
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def update(self, path, data=None): |
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"""Send an update request to the given path of the CRUD API, with the given data dict, which will be converted |
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into json""" |
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return self.handleresult(self.r.put(urljoin(self.url + CRUD_PATH, |
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path), |
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data=json.dumps(data))) |
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def delete(self, path): |
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"""Send a delete request to the given path of the CRUD API. This deletes the object. Or at least tries to.""" |
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return self.handleresult(self.r.delete(urljoin(self.url + CRUD_PATH, |
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path))) |
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def get(self, path, params=None): |
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"""Sends a get request to the given path in the database and with optional URL parameters""" |
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return self.handleresult(self.r.get(urljoin(self.url, path), |
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params=params)) |
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def subscribe(self, stream, callback, transform=""): |
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"""Subscribe to the given stream with the callback""" |
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return self.ws.subscribe(stream, callback, transform) |
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def unsubscribe(self, stream, transform=""): |
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"""Unsubscribe from the given stream""" |
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return self.ws.unsubscribe(stream, transform) |
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def wsdisconnect(self): |
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"""Disconnects the websocket""" |
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self.ws.disconnect() |
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connectordb /
connectordb-python
