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# Test network loopback behaviour
try:
import asyncio
except ImportError:
print("SKIP")
raise SystemExit
async def client(host, port):
print(f"client open_connection to {host}:{port}")
reader, writer = await asyncio.open_connection(host, port)
data_in = b"A" * 100
print("client writing")
writer.write(data_in)
await writer.drain()
await asyncio.sleep(0.1)
print("client reading")
data = await reader.readexactly(100)
print(f"client got {len(data)} bytes")
assert data_in == data
print("client closing")
writer.close()
await writer.wait_closed()
print("client closed")
async def echo_handler(reader, writer):
print("handler reading")
await asyncio.sleep(0.1)
data = await reader.readexactly(100)
print(f"handler got {len(data)} bytes")
print("handler writing")
writer.write(data)
await writer.drain()
print("handler closing")
writer.close()
await writer.wait_closed()
print("handler closed")
async def test(host, port):
print(f"create server on {host}:{port}")
server = await asyncio.start_server(echo_handler, host, port)
async with server:
print("server started")
await client("127.0.0.1", 8080)
print("server closed")
asyncio.run(test("0.0.0.0", 8080))
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