Add parameters to AsyncBufferedConsumer

The `AsyncBufferedConsumer` constructor now supports more arguments.
Those are the same as for the `BufferConsumer` coming from the official
Mixpanel package, which is used under the hood.

I removed the `*args` and `**kwargs` parameters so that only supported
arguments are accepted. This should avoid surprises for users.  This
breaking change is mentioned in the changelog.

CHANGELOG.md

@@ -7,6 +7,17 @@ project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Added
+
+* New parameters for the `AsyncBufferedConsumer` constructor: `import_url`,
+  `request_timeout`, `groups_url`, `api_host`, `retry_limit`, `retry_backoff_factor`,
+  `verify_cert`.
+
+### Changed
+
+* Extra arguments (`*args`, `**kwargs`) are no longer accepted in the
+  `AsyncBufferedConsumer` constructor.
+
 ## [0.2.0] - 2019-07-11
 
 ### Added

README.md

@@ -34,14 +34,17 @@ For most users, the default configuration should work perfectly. For more specif
 
 
 * `flush_after (datetime.timedelta)` - *defaults to 10 seconds*  - the time period after which the AsyncBufferedConsumer will flush the events upon receiving a new event (no matter what the event queue size is)
-
 * `flush_first (bool)` - *defaults to True* - whether the consumer should always flush the first event.
-
 * `max_size (int)` - *defaults to 20* - how big a given event queue can get before it is flushed by the consumer
-
 * `events_url (str)` - *defaults to standard Mixpanel API URL* - the Mixpanel API URL that track events will be sent to
-
 * `people_url (str)` - *defaults to standard Mixpanel API URL* - the Mixpanel API URL that people events will be sent to
+* `import_url (str)` - *defaults to standard Mixpanel API URL* - the Mixpanel API URL that import events will be sent to
+* `request_timeout (int)` - *defaults to `None` (no timeout)* - Connection timeout in seconds.
+* `groups_url (str)` - *defaults to standard Mixpanel API URL* - the Mixpanel API URL that groups events will be sent to
+* `api_host (str)` - *defaults to api.mixpanel.com* - Mixpanel API domain for all requests unless overridden by above URLs
+* `retry_limit (int)` - *defaults to 4* - Number of times to retry each request in case of an error, 0 to fail after first attempt.
+* `retry_backoff_factor` - *defaults to 0.25* - Factor which controls sleep duration between retries: `sleep_seconds = backoff_factor * (2 ^ (retry_count - 1))`
+* `verify_cert` - *defaults to `True`*- Whether to verify the server certificate. `True` is recommended.
 
 ### Usage
 

mixpanel_async/async_buffered_consumer.py

@@ -53,8 +53,21 @@ class AsyncBufferedConsumer(SynchronousBufferedConsumer):
     ALL = "ALL"
     ENDPOINT = "ENDPOINT"
 
-    def __init__(self, flush_after=timedelta(0, 10), flush_first=True, max_size=20,
-        events_url=None, people_url=None, *args, **kwargs):
+    def __init__(
+        self,
+        flush_after=timedelta(0, 10),
+        flush_first=True,
+        max_size=20,
+        events_url=None,
+        people_url=None,
+        import_url=None,
+        request_timeout=None,
+        groups_url=None,
+        api_host="api.mixpanel.com",
+        retry_limit=4,
+        retry_backoff_factor=0.25,
+        verify_cert=True,
+    ):
         '''
         Create a new instance of a AsyncBufferedConsumer class.
 
@@ -65,13 +78,30 @@ def __init__(self, flush_after=timedelta(0, 10), flush_first=True, max_size=20,
         the consumer receives
         :param max_size (int): the number of events in queue that will trigger
         the queue to be flushed asynchronously
-        :param events_url: the Mixpanel API URL that track events will be sent to
-        :param people_url: the Mixpanel API URL that people events will be sent to
+        :param events_url: Mixpanel API URL that track events will be sent to
+        :param people_url: Mixpanel API URL that people events will be sent to
+        :param import_url: Mixpanel API URL that import events will be sent to
+        :param request_timeout: Connection timeout in seconds
+        :param groups_url: Mixpanel API URL that groups events will be sent to
+        :param api_host: Mixpanel API domain for all requests unless overriden by above URLs
+        :param retry_limit: Number of times to retry each request in case of an error, 0
+        to fail after first attempt.
+        :param retry_backoff_factor: Factor which controls sleep duration between retries:
+        sleep_seconds = backoff_factor * (2 ^ (retry_count - 1))
+        :param verify_cert: Whether to verify the server certificate. "True" is
+        recommended.
         '''
         super(AsyncBufferedConsumer, self).__init__(
             max_size=max_size,
             events_url=events_url,
-            people_url=people_url
+            people_url=people_url,
+            import_url=import_url,
+            request_timeout=request_timeout,
+            groups_url=groups_url,
+            api_host=api_host,
+            retry_limit=retry_limit,
+            retry_backoff_factor=retry_backoff_factor,
+            verify_cert=verify_cert,
         )
 
         # remove the minimum max size that the SynchronousBufferedConsumer