tests/multi_net: Add uasyncio test for TCP server and client.

Includes a test where the (non uasyncio) client does a RST on the
connection, as a simple TCP server/client test where both sides are using
uasyncio, and a test for TCP stream close then write.

tests/multi_net/uasyncio_tcp_client_rst.py

@@ -0,0 +1,56 @@
+# Test TCP server with client issuing TCP RST part way through read
+
+try:
+    import uasyncio as asyncio
+except ImportError:
+    try:
+        import asyncio
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+import struct, time, socket
+
+PORT = 8000
+
+
+async def handle_connection(reader, writer):
+    data = await reader.read(10)  # should succeed
+    print(data)
+    await asyncio.sleep(0.2)  # wait for client to drop connection
+    try:
+        data = await reader.read(100)
+        print(data)
+        writer.close()
+        await writer.wait_closed()
+    except OSError as er:
+        print("OSError", er.args[0])
+    ev.set()
+
+
+async def main():
+    global ev
+    ev = asyncio.Event()
+    server = await asyncio.start_server(handle_connection, "0.0.0.0", PORT)
+    multitest.next()
+    async with server:
+        await asyncio.wait_for(ev.wait(), 10)
+
+
+def instance0():
+    multitest.globals(IP=multitest.get_network_ip())
+    asyncio.run(main())
+
+
+def instance1():
+    if not hasattr(socket, "SO_LINGER"):
+        multitest.skip()
+    multitest.next()
+    s = socket.socket()
+    s.connect(socket.getaddrinfo(IP, PORT)[0][-1])
+    lgr_onoff = 1
+    lgr_linger = 0
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, struct.pack("ii", lgr_onoff, lgr_linger))
+    s.send(b"GET / HTTP/1.0\r\n\r\n")
+    time.sleep(0.1)
+    s.close()  # This issues a TCP RST since we've set the linger option

tests/multi_net/uasyncio_tcp_client_rst.py.exp

@@ -0,0 +1,5 @@
+--- instance0 ---
+b'GET / HTTP'
+OSError 104
+--- instance1 ---
+

tests/multi_net/uasyncio_tcp_close_write.py

@@ -0,0 +1,69 @@
+# Test uasyncio TCP stream closing then writing
+
+try:
+    import uasyncio as asyncio
+except ImportError:
+    try:
+        import asyncio
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+PORT = 8000
+
+
+async def handle_connection(reader, writer):
+    # Write data to ensure connection
+    writer.write(b"x")
+    await writer.drain()
+
+    # Read, should return nothing
+    print("read:", await reader.read(100))
+
+    # Close connection
+    print("close")
+    writer.close()
+    await writer.wait_closed()
+
+    print("done")
+    ev.set()
+
+
+async def tcp_server():
+    global ev
+    ev = asyncio.Event()
+    server = await asyncio.start_server(handle_connection, "0.0.0.0", PORT)
+    print("server running")
+    multitest.next()
+    async with server:
+        await asyncio.wait_for(ev.wait(), 5)
+
+
+async def tcp_client():
+    reader, writer = await asyncio.open_connection(IP, PORT)
+
+    # Read data to ensure connection
+    print("read:", await reader.read(1))
+
+    # Close connection
+    print("close")
+    writer.close()
+    await writer.wait_closed()
+
+    # Try writing data to the closed connection
+    print("write")
+    try:
+        writer.write(b"x")
+        await writer.drain()
+    except OSError:
+        print("OSError")
+
+
+def instance0():
+    multitest.globals(IP=multitest.get_network_ip())
+    asyncio.run(tcp_server())
+
+
+def instance1():
+    multitest.next()
+    asyncio.run(tcp_client())

tests/multi_net/uasyncio_tcp_close_write.py.exp

@@ -0,0 +1,10 @@
+--- instance0 ---
+server running
+read: b''
+close
+done
+--- instance1 ---
+read: b'x'
+close
+write
+OSError

tests/multi_net/uasyncio_tcp_server_client.py

@@ -0,0 +1,58 @@
+# Test uasyncio TCP server and client using start_server() and open_connection()
+
+try:
+    import uasyncio as asyncio
+except ImportError:
+    try:
+        import asyncio
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+PORT = 8000
+
+
+async def handle_connection(reader, writer):
+    # Test that peername exists (but don't check its value, it changes)
+    writer.get_extra_info("peername")
+
+    data = await reader.read(100)
+    print("echo:", data)
+    writer.write(data)
+    await writer.drain()
+
+    print("close")
+    writer.close()
+    await writer.wait_closed()
+
+    print("done")
+    ev.set()
+
+
+async def tcp_server():
+    global ev
+    ev = asyncio.Event()
+    server = await asyncio.start_server(handle_connection, "0.0.0.0", PORT)
+    print("server running")
+    multitest.next()
+    async with server:
+        await asyncio.wait_for(ev.wait(), 10)
+
+
+async def tcp_client(message):
+    reader, writer = await asyncio.open_connection(IP, PORT)
+    print("write:", message)
+    writer.write(message)
+    await writer.drain()
+    data = await reader.read(100)
+    print("read:", data)
+
+
+def instance0():
+    multitest.globals(IP=multitest.get_network_ip())
+    asyncio.run(tcp_server())
+
+
+def instance1():
+    multitest.next()
+    asyncio.run(tcp_client(b"client data"))

tests/multi_net/uasyncio_tcp_server_client.py.exp

@@ -0,0 +1,8 @@
+--- instance0 ---
+server running
+echo: b'client data'
+close
+done
+--- instance1 ---
+write: b'client data'
+read: b'client data'