Add trio for step 4

Author: ngokchaoho

pyredis/__main__.py

@@ -1,5 +1,6 @@
 import argparse
 import asyncio
+import trio
 
 from pyredis.server import Server
 from pyredis.asyncserver import RedisServerProtocol
@@ -20,6 +21,11 @@ async def amain(args):
         await server.serve_forever()
 
 
+async def tmain(args):
+    server = Server(args.port)
+    await server.run()
+
+
 def main(args):
     print(f"Starting PyRedis on port: {args.port}")
 
@@ -38,6 +44,7 @@ def main(args):
         default=REDIS_DEFAULT_PORT,
     )
     parser.add_argument("--asyncio", action=argparse.BooleanOptionalAction)
+    parser.add_argument("--trio", action=argparse.BooleanOptionalAction)
     parser.add_argument(
         "-v",
         "--verbose",
@@ -52,6 +59,9 @@ def main(args):
     if args.asyncio:
         logging.info("Using AsyncIO RedisServerProtocol")
         asyncio.run(amain(args))
+    elif args.trio:
+        logging.info("Using Trio Stream API")
+        trio.run(tmain, args)
     else:
         logging.info("Using threading module for multi-threading")
         main(args)

pyredis/trioserver.py

@@ -0,0 +1,53 @@
+from trio import SocketListener, serve_tcp, SocketStream
+import logging
+import trio
+
+from pyredis.protocol import extract_frame_from_buffer, encode_message
+from pyredis.commands import handle_command
+from pyredis.datastore import DataStore
+
+RECV_SIZE = 2048
+log = logging.getLogger("pyredis")
+
+
+class Server:
+    def __init__(self, port) -> None:
+        self.port = port
+        self._running = False
+        self._datastore = DataStore()
+
+    async def run(self):
+        self._running = True
+
+        async with trio.open_nursery() as nursery:
+            await nursery.start(
+                serve_tcp,
+                self.handle_client_connection,
+                port=self.port,
+                host="127.0.0.1",
+            )
+
+    async def handle_client_connection(self, client_stream: SocketStream):
+        buffer = bytearray()
+        try:
+            while True:
+                data = await client_stream.receive_some(RECV_SIZE)
+                log.info("Received data from client")
+                if not data:
+                    log.info("Readched EOF")
+                    break
+                buffer.extend(data)
+                frame, frame_size = extract_frame_from_buffer(buffer)
+                log.info("Extracted one frame from received data")
+                if frame:
+                    buffer = buffer[frame_size:]
+                    log.info("Processing one frame")
+                    result = handle_command(frame, self._datastore)
+                    await client_stream.send_all(encode_message(result))
+
+        finally:
+            log.info("Attempt to close stream")
+            await client_stream.aclose()
+
+    def stop(self):
+        self._running = False