refactor: replace EdxRestAPIClient with OAuthAPIClient

closes openedx/public-engineering#48

*Note:*
The httpretty library was replaced with responses because it had issues
with keeping connection with requests.Session.

e2e/api.py

@@ -1,6 +1,4 @@
-
-
-from edx_rest_api_client.client import EdxRestApiClient
+from edx_rest_api_client.client import OAuthAPIClient
 
 from e2e.config import (
     DISCOVERY_API_URL_ROOT,
@@ -18,19 +16,20 @@ class BaseApi:
 
     def __init__(self):
         assert self.api_url_root
-        access_token, __ = self.get_access_token()
-        self._client = EdxRestApiClient(self.api_url_root, jwt=access_token, append_slash=self.append_slash)
+        self._client = OAuthAPIClient(OAUTH_ACCESS_TOKEN_URL, OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET)
 
-    @staticmethod
-    def get_access_token():
-        """ Returns an access token and expiration date from the OAuth provider.
+    def get_api_url(self, path):
+        """
+        Construct the full API URL using the api_url_root and path.
 
-        Returns:
-            (str, datetime)
+        Args:
+            path (str): API endpoint path.
         """
-        return EdxRestApiClient.get_oauth_access_token(
-            OAUTH_ACCESS_TOKEN_URL, OAUTH_CLIENT_ID, OAUTH_CLIENT_SECRET, token_type='jwt'
-        )
+        path = path.strip('/')
+        if self.append_slash:
+            path += '/'
+
+        return urljoin(f"{self.api_url_root}/", path)  # type: ignore
 
 
 class DiscoveryApi(BaseApi):
@@ -48,9 +47,15 @@ def get_course_runs(self, seat_type):
         Returns:
             list(dict)
         """
-        results = self._client.search.course_runs.facets.get(
-            selected_query_facets='availability_current', selected_facets='seat_types_exact:{}'.format(seat_type))
-        return results['objects']['results']
+        response = self._client.get(
+            self.get_api_url("search/course_runs/facets/"),
+            params={
+                "selected_query_facets": "availability_current",
+                "selected_facets": f"seat_types_exact:{seat_type}"
+            }
+        )
+        response.raise_for_status()
+        return response.json()['objects']['results']
 
     def get_course_run(self, course_run):
         """ Returns the details for a given course run.
@@ -61,7 +66,11 @@ def get_course_run(self, course_run):
         Returns:
             dict
         """
-        return self._client.course_runs(course_run).get()
+        response = self._client.get(
+            self.get_api_url(f"course_runs/{course_run}/"),
+        )
+        response.raise_for_status()
+        return response.json()
 
 
 class EcommerceApi(BaseApi):
@@ -77,10 +86,20 @@ def create_refunds_for_course_run(self, username, course_run_id):
         Returns:
             str[]: List of refund IDs.
         """
-        return self._client.refunds.post({'username': username, 'course_id': course_run_id})
+        response = self._client.post(
+            self.get_api_url("refunds/"),
+            json={'username': username, 'course_id': course_run_id}
+        )
+        response.raise_for_status()
+        return response.json()
 
     def process_refund(self, refund_id, action):
-        return self._client.refunds(refund_id).process.put({'action': action})
+        response = self._client.put(
+            self.get_api_url(f"refunds/{refund_id}/process/"),
+            json={'action': action}
+        )
+        response.raise_for_status()
+        return response.json()
 
 
 class EnrollmentApi(BaseApi):
@@ -94,4 +113,8 @@ def get_enrollment(self, username, course_run_id):
             username (str)
             course_run_id (str)
         """
-        return self._client.enrollment('{},{}'.format(username, course_run_id)).get()
+        response = self._client.get(
+            self.get_api_url(f"enrollment/{username},{course_run_id}")
+        )
+        response.raise_for_status()
+        return response.json()

ecommerce/core/management/commands/sync_hubspot.py

@@ -7,15 +7,16 @@
 import logging
 import time
 import traceback
+import requests
 from datetime import datetime, timedelta
 from decimal import Decimal as D
+from urllib.parse import urljoin
 
 from django.contrib.auth import get_user_model
 from django.core.management.base import BaseCommand, CommandError
 from django.db.models import Q
-from edx_rest_api_client.client import EdxRestApiClient
 from oscar.core.loading import get_class, get_model
-from slumber.exceptions import HttpClientError, HttpServerError
+from requests.exceptions import RequestException, HTTPError
 
 from ecommerce.extensions.fulfillment.status import ORDER
 
@@ -174,6 +175,8 @@
 DEAL = "DEAL"
 BATCH_SIZE = 200
 
+EXPECTED_METHODS = ["GET", "POST", "PUT"]
+
 
 class Command(BaseCommand):
     help = 'Sync Product, Orders and Lines to Hubspot server.'
@@ -189,14 +192,12 @@ def _hubspot_endpoint(self, hubspot_object, api_url, method, body=None, **kwargs
         """
         This function is responsible for all the calls of hubspot.
         """
-        client = EdxRestApiClient('/'.join([HUBSPOT_API_BASE_URL, api_url]))
-        if method == "GET":
-            return getattr(client, hubspot_object).get(**kwargs)
-        if method == "POST":
-            return getattr(client, hubspot_object).post(**kwargs)
-        if method == "PUT":
-            return getattr(client, hubspot_object).put(body, **kwargs)
-        raise ValueError("Unexpected method {}".format(method))
+        api_url = urljoin(f"{HUBSPOT_API_BASE_URL}/", f"{api_url}/{hubspot_object}")
+        if method not in EXPECTED_METHODS:
+            raise ValueError(f"Unexpected method {method}. Allowed methods are: {EXPECTED_METHODS}")
+        response = requests.request(method, api_url, json=body, params=kwargs)
+        response.raise_for_status()
+        return response.json()
 
     def _install_hubspot_ecommerce_bridge(self, site_configuration):
         """
@@ -216,7 +217,7 @@ def _install_hubspot_ecommerce_bridge(self, site_configuration):
                 )
             )
             status = True
-        except (HttpClientError, HttpServerError) as ex:
+        except (HTTPError, RequestException) as ex:
             self.stderr.write(
                 'An error occurred while installing hubspot ecommerce bridge for site {site}, {message}'.format(
                     site=site_configuration.site.domain, message=ex
@@ -243,7 +244,7 @@ def _define_hubspot_ecommerce_settings(self, site_configuration):
                 )
             )
             status = True
-        except (HttpClientError, HttpServerError) as ex:
+        except (HTTPError, RequestException) as ex:
             self.stderr.write(
                 'An error occurred while defining hubspot ecommerce settings for site {site}, {message}'.format(
                     site=site_configuration.site.domain, message=ex
@@ -416,7 +417,7 @@ def _upsert_hubspot_objects(self, object_type, objects, site_configuration):
                         site=site_configuration.site.domain
                     )
                 )
-        except (HttpClientError, HttpServerError) as ex:
+        except (HTTPError, RequestException) as ex:
             self.stderr.write(
                 'An error occurred while upserting {object_type} for site {site}: {message}'.format(
                     object_type=object_type, site=site_configuration.site.domain, message=ex
@@ -443,7 +444,7 @@ def _call_sync_errors_messages_endpoint(self, site_configuration):
                         message=error.get('details')
                     )
                 )
-        except (HttpClientError, HttpServerError) as ex:
+        except (HTTPError, RequestException) as ex:
             self.stderr.write(
                 'An error occurred while getting the error syncing message for site {site}: {message} '.format(
                     site=site_configuration.site.domain, message=ex

ecommerce/core/management/commands/tests/test_sync_hubspot.py

@@ -10,7 +10,7 @@
 from django.core.management.base import CommandError
 from factory.django import get_model
 from mock import patch
-from slumber.exceptions import HttpClientError
+from requests.exceptions import HTTPError
 
 from ecommerce.core.management.commands.sync_hubspot import Command as sync_command
 from ecommerce.extensions.test.factories import create_basket, create_order
@@ -132,7 +132,7 @@ def test_upsert_hubspot_objects(self, mocked_hubspot):
         with patch.object(sync_command, '_install_hubspot_ecommerce_bridge', return_value=True), \
                 patch.object(sync_command, '_define_hubspot_ecommerce_settings', return_value=True):
             # if _upsert_hubspot_objects raises an exception
-            mocked_hubspot.side_effect = HttpClientError
+            mocked_hubspot.side_effect = HTTPError
             output = self._get_command_output(is_stderr=True)
             self.assertIn('An error occurred while upserting', output)
 
@@ -145,7 +145,7 @@ def test_install_hubspot_ecommerce_bridge(self, mocked_hubspot):
             output = self._get_command_output()
             self.assertIn('Successfully installed hubspot ecommerce bridge', output)
             # if _install_hubspot_ecommerce_bridge raises an exception
-            mocked_hubspot.side_effect = HttpClientError
+            mocked_hubspot.side_effect = HTTPError
             output = self._get_command_output(is_stderr=True)
             self.assertIn('An error occurred while installing hubspot ecommerce bridge', output)
 
@@ -158,7 +158,7 @@ def test_define_hubspot_ecommerce_settings(self, mocked_hubspot):
             output = self._get_command_output()
             self.assertIn('Successfully defined the hubspot ecommerce settings', output)
             # if _define_hubspot_ecommerce_settings raises an exception
-            mocked_hubspot.side_effect = HttpClientError
+            mocked_hubspot.side_effect = HTTPError
             output = self._get_command_output(is_stderr=True)
             self.assertIn('An error occurred while defining hubspot ecommerce settings', output)
 
@@ -183,7 +183,7 @@ def test_sync_errors_messages_endpoint(self, mocked_hubspot):
                 output
             )
             # if _call_sync_errors_messages_endpoint raises an exception
-            mocked_hubspot.side_effect = HttpClientError
+            mocked_hubspot.side_effect = HTTPError
             output = self._get_command_output(is_stderr=True)
             self.assertIn(
                 'An error occurred while getting the error syncing message',
@@ -201,7 +201,7 @@ def test_hubspot_endpoint(self):
         6. Upsert(LINE ITEM)
         7. Sync-error
         """
-        with patch('ecommerce.core.management.commands.sync_hubspot.EdxRestApiClient') as mock_client:
+        with patch('ecommerce.core.management.commands.sync_hubspot.requests.request') as mock_client:
             output = self._get_command_output()
             self.assertEqual(mock_client.call_count, 7)
             self.assertIn('Successfully installed hubspot ecommerce bridge', output)
@@ -215,7 +215,7 @@ def test_with_exception(self, mocked_hubspot):      # pylint: disable=unused-arg
         with patch.object(sync_command, '_install_hubspot_ecommerce_bridge', return_value=True), \
                 patch.object(sync_command, '_define_hubspot_ecommerce_settings', return_value=True), \
                 patch.object(sync_command, '_get_unsynced_carts') as mocked_get_unsynced_carts:
-            mocked_get_unsynced_carts.side_effect = HttpClientError
+            mocked_get_unsynced_carts.side_effect = HTTPError
             with self.assertRaises(CommandError):
                 output = self._get_command_output(is_stderr=True)
                 self.assertIn('Command failed with ', output)