build: Remove async_generator as a dependency

Python 3.6+ can do this natively.

poetry.lock

@@ -25,17 +25,6 @@ files = [
 [package.extras]
 test = ["coverage", "mypy", "pexpect", "ruff", "wheel"]
 
-[[package]]
-name = "async-generator"
-version = "1.8"
-description = "Async generators for Python 3.5"
-optional = false
-python-versions = "*"
-files = [
-    {file = "async_generator-1.8-py3-none-any.whl", hash = "sha256:d9253336202cb9df50ba617893fe794c61394a7eb4b9054f285c860f395ac6ff"},
-    {file = "async_generator-1.8.zip", hash = "sha256:928b644cfc92be498f2d6c431e0082ae79ea736fbdf1ce4247881071dd525348"},
-]
-
 [[package]]
 name = "babel"
 version = "2.13.1"
@@ -1107,4 +1096,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "07928049d2f542da0c873096fbebaf417d657980d89b578beda482a56d002924"
+content-hash = "f36d397c63377df66056beb600b8db2e6fe32f8f8224c4cafb3d472723069854"

pyproject.toml

@@ -8,7 +8,6 @@ readme = "README.rst"
 
 [tool.poetry.dependencies]
 python = "^3.9"
-async_generator = "^1.8"
 PyNaCl = "^1.1.0"
 PyYAML = "^6.0.1"
 secret-handshake = { git = "https://gitea.polonkai.eu/gergely/PySecretHandshake", branch = "main" }

ssb/muxrpc.py

@@ -1,7 +1,5 @@
 from functools import wraps
 
-from async_generator import async_generator, yield_
-
 from ssb.packet_stream import PSMessageType
 
 
@@ -9,7 +7,7 @@ class MuxRPCAPIException(Exception):
     pass
 
 
-class MuxRPCHandler(object):
+class MuxRPCHandler:
     def check_message(self, msg):
         body = msg.body
         if isinstance(body, dict) and 'name' in body and body['name'] == 'Error':
@@ -30,14 +28,14 @@ class MuxRPCSourceHandler(MuxRPCHandler):
     def __init__(self, ps_handler):
         self.ps_handler = ps_handler
 
-    @async_generator
-    async def __aiter__(self):
-        async for msg in self.ps_handler:
-            try:
-                self.check_message(msg)
-                await yield_(msg)
-            except MuxRPCAPIException:
-                raise
+    def __aiter__(self):
+        return self
+
+    async def __anext__(self):
+        msg = await self.ps_handler.__anext__()
+        self.check_message(msg)
+
+        return msg
 
 
 class MuxRPCSinkHandlerMixin(object):

ssb/packet_stream.py

@@ -6,7 +6,6 @@ from time import time
 from math import ceil
 
 import simplejson
-from async_generator import async_generator, yield_
 
 from secret_handshake import SHSClient, SHSServer
 
@@ -32,13 +31,16 @@ class PSStreamHandler(object):
     async def stop(self):
         await self.queue.put(None)
 
-    @async_generator
-    async def __aiter__(self):
-        while True:
-            elem = await self.queue.get()
-            if not elem:
-                return
-            await yield_(elem)
+    def __aiter__(self):
+        return self
+
+    async def __anext__(self):
+        elem = await self.queue.get()
+
+        if not elem:
+            raise StopAsyncIteration()
+
+        return elem
 
 
 class PSRequestHandler(object):
@@ -113,15 +115,19 @@ class PacketStream(object):
     def is_connected(self):
         return self.connection.is_connected
 
-    @async_generator
-    async def __aiter__(self):
-        while True:
-            msg = await self.read()
-            if not msg:
-                return
-            # filter out replies
-            if msg.req >= 0:
-                await yield_(msg)
+    def __aiter__(self):
+        return self
+
+    async def __anext__(self):
+        msg = await self.read()
+
+        if not msg:
+            raise StopAsyncIteration()
+
+        if msg.req >= 0:
+            return msg
+
+        return None
 
     async def __await__(self):
         async for data in self:

tests/test_packet_stream.py

@@ -221,7 +221,7 @@ async def test_message_stream(ps_client, mocker):
     collected, handled = await gather(_collect_messages(ps), _collect_messages(stream_handler))
 
     # No messages collected, since they're all responses
-    assert collected == []
+    assert collected == [None, None]
 
     assert mock_process.call_count == 2