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([2001:b07:6468:f312:784d:f09c:63f4:b9cb]) by smtp.gmail.com with ESMTPSA id c5sm10840053wmb.9.2020.01.25.03.41.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 25 Jan 2020 03:41:24 -0800 (PST) Subject: Re: Making QEMU easier for management tools and applications To: Stefan Hajnoczi , Kashyap Chamarthy References: <87h81unja8.fsf@dusky.pond.sub.org> <20200102144722.GL121208@stefanha-x1.localdomain> <20200116110314.GA24159@paraplu> <20200120095554.GA345995@stefanha-x1.localdomain> From: Paolo Bonzini Message-ID: <89636ffa-712d-a163-538f-c1db8ad1467c@redhat.com> Date: Sat, 25 Jan 2020 12:41:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20200120095554.GA345995@stefanha-x1.localdomain> Content-Language: en-US X-MC-Unique: MMUuBsNoMSaoW06M-ArBMA-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Peter Maydell , "Daniel P. Berrange" , "Denis V. Lunev" , Cleber Rosa , Markus Armbruster , qemu-devel , =?UTF-8?Q?Marc-Andr=c3=a9_Lureau?= , Dominik Csapak , John Snow , Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 20/01/20 10:55, Stefan Hajnoczi wrote: >> >> [1] https://qemu.readthedocs.io/en/latest/interop/live-block-operations.= html > John and I discussed async events in the past. qmp-shell currently uses > the input() built-in function. If we modify it with a > select(2)/poll(2)-style function that monitors both stdin and the QMP > socket then it could print QMP events as soon as they are received. I think it should be rewritten using async/await. A simple example: import asyncio import sys from concurrent.futures import ThreadPoolExecutor async def ainput(prompt: str =3D ""): with ThreadPoolExecutor(1, "ainput") as executor: return (await asyncio.get_event_loop().run_in_executor( executor, sys.stdin.readline )).rstrip() async def numbers(): i =3D 1 while True: print(i) i =3D i + 1 await asyncio.sleep(1) async def main(): name =3D await ainput("What's your name? ") print("Hello, {}!".format(name)) asyncio.get_event_loop().create_task(numbers()) asyncio.get_event_loop().run_until_complete(main()) This would be a great Summer of Code project. Even an autocompletion interface using readline should be possible. Paolo