Add async autoreconnect

2 files changed, 60 insertions, 30 deletions

diff --git a/mastodon/Mastodon.py b/mastodon/Mastodon.py
index 8b7064f..933a6c5 100644
--- a/mastodon/Mastodon.py
+++ b/mastodon/Mastodon.py
@@ -1387,45 +1387,45 @@ class Mastodon:
     # Streaming
     ###
     @api_version("1.1.0", "1.4.2")    
-    def stream_user(self, listener, async=False):
+    def stream_user(self, listener, async=False, reconnect_async=False, reconnect_async_wait_sec=5):
         """
         Streams events that are relevant to the authorized user, i.e. home
         timeline and notifications.
         """
-        return self.__stream('/api/v1/streaming/user', listener, async=async)
+        return self.__stream('/api/v1/streaming/user', listener, async=async, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
 
     @api_version("1.1.0", "1.4.2")
-    def stream_public(self, listener, async=False):
+    def stream_public(self, listener, async=False, reconnect_async=False, reconnect_async_wait_sec=5):
         """
         Streams public events.
         """
-        return self.__stream('/api/v1/streaming/public', listener, async=async)
+        return self.__stream('/api/v1/streaming/public', listener, async=async, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
 
     @api_version("1.1.0", "1.4.2")
-    def stream_local(self, listener, async=False):
+    def stream_local(self, listener, async=False, reconnect_async=False, reconnect_async_wait_sec=5):
         """
         Streams local public events.
         """
-        return self.__stream('/api/v1/streaming/public/local', listener, async=async)
+        return self.__stream('/api/v1/streaming/public/local', listener, async=async, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
 
     @api_version("1.1.0", "1.4.2")
-    def stream_hashtag(self, tag, listener, async=False):
+    def stream_hashtag(self, tag, listener, async=False, reconnect_async=False, reconnect_async_wait_sec=5):
         """
         Stream for all public statuses for the hashtag 'tag' seen by the connected
         instance.
         """
         if tag.startswith("#"):
             raise MastodonIllegalArgumentError("Tag parameter should omit leading #")
-        return self.__stream("/api/v1/streaming/hashtag?tag={}".format(tag), listener, async=async)
+        return self.__stream("/api/v1/streaming/hashtag?tag={}".format(tag), listener, async=async, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
 
     @api_version("2.1.0", "2.1.0")
-    def stream_list(self, id, listener, async=False):
+    def stream_list(self, id, listener, async=False, reconnect_async=False, reconnect_async_wait_sec=5):
         """
         Stream events for the current user, restricted to accounts on the given
         list. 
         """
         id =  self.__unpack_id(id)
-        return self.__stream("/api/v1/streaming/list?list={}".format(id), listener, async=async)
+        return self.__stream("/api/v1/streaming/list?list={}".format(id), listener, async=async, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
     
     ###
     # Internal helpers, dragons probably
@@ -1667,7 +1667,7 @@ class Mastodon:
 
         return response
 
-    def __stream(self, endpoint, listener, params={}, async=False):
+    def __stream(self, endpoint, listener, params={}, async=False, reconnect_async=False, reconnect_async_wait_sec=5):
         """
         Internal streaming API helper.
 
@@ -1695,18 +1695,27 @@ class Mastodon:
         # The streaming server can't handle two slashes in a path, so remove trailing slashes
         if url[-1] == '/':
             url = url[:-1]
-
-        headers = {"Authorization": "Bearer " + self.access_token}
-        connection = requests.get(url + endpoint, headers = headers, data = params, stream = True)
-
-        if connection.status_code != 200:
-            raise MastodonNetworkError("Could not connect to streaming server: %s" % connection.reason)
-
+        
+        # Connect function (called and then potentially passed to async handler)
+        def connect_func():
+            headers = {"Authorization": "Bearer " + self.access_token}
+            connection = requests.get(url + endpoint, headers = headers, data = params, stream = True)
+
+            if connection.status_code != 200:
+                raise MastodonNetworkError("Could not connect to streaming server: %s" % connection.reason)
+            return connection
+        connection = connect_func()
+        
+        # Async stream handler
         class __stream_handle():
-            def __init__(self, connection):
+            def __init__(self, connection, connect_func, reconnect_async, reconnect_async_wait_sec):
                 self.closed = False
+                self.running = True
                 self.connection = connection
-
+                self.connect_func = connect_func
+                self.reconnect_async = reconnect_async
+                self.reconnect_async_wait_sec = reconnect_async_wait_sec
+                
             def close(self):
                 self.closed = True
                 self.connection.close()
@@ -1716,17 +1725,39 @@ class Mastodon:
 
             def _threadproc(self):
                 self._thread = threading.current_thread()
-                with closing(connection) as r:
-                    try:
-                        listener.handle_stream(r)
-                    except AttributeError as e:
-                        if not self.closed:
-                            raise e
+                
+                # Run until closed or until error if not autoreconnecting
+                while self.running:
+                    with closing(self.connection) as r:
+                        try:
+                            listener.handle_stream(r)
+                        except (AttributeError, MastodonMalformedEventError, MastodonNetworkError) as e:
+                            if not (self.closed or self.reconnect_async):
+                                raise e
+                            else:
+                                if self.closed:
+                                    self.running = False
+
+                    # Reconnect loop. Try immediately once, then with delays on error.
+                    if self.reconnect_async and not self.closed:
+                        connect_success = False
+                        while not connect_success:
+                            connect_success = True
+                            try:
+                                self.connection = self.connect_func()
+                                if self.connection.status_code != 200:
+                                    time.sleep(self.reconnect_async_wait_sec)
+                                    connect_success = False
+                            except:
+                                time.sleep(self.reconnect_async_wait_sec)
+                                connect_success = False
+                                
+                    else:
+                        self.running = False
                 return 0
 
-        handle = __stream_handle(connection)
-
         if async:
+            handle = __stream_handle(connection, connect_func, reconnect_async, reconnect_async_wait_sec)
             t = threading.Thread(args=(), daemon = True, target=handle._threadproc)
             t.start()
             return handle
diff --git a/mastodon/streaming.py b/mastodon/streaming.py
index f59b431..1c73f48 100644
--- a/mastodon/streaming.py
+++ b/mastodon/streaming.py
@@ -6,7 +6,7 @@ https://github.com/tootsuite/mastodon/blob/master/docs/Using-the-API/Streaming-A
 import json
 import six
 from mastodon import Mastodon
-from mastodon.Mastodon import MastodonMalformedEventError
+from mastodon.Mastodon import MastodonMalformedEventError, MastodonNetworkError
 from requests.exceptions import ChunkedEncodingError
 
 class StreamListener(object):
@@ -109,7 +109,6 @@ class StreamListener(object):
                err
             )
         else:
-            # TODO: allow handlers to return/raise to stop streaming cleanly
             handler(payload)
 
 class CallbackStreamListener(StreamListener):