如何在Zeep插件中使用asyncio库

Question

如何在Zeep插件中使用asyncio库

在将SOAP请求发送到服务器之前，我需要使用外部程序向其添加一些标签。 我已经写了插件到Zeep库：

class ZeepSignPlugin(Plugin):
    def egress(self, envelope, http_headers, operation, binding_options):
        tmp_filename = 'tmp_filename.xml'
        tmp_signed_filename = 'tmp_signed_filename.xml'

        et = etree.ElementTree(envelope)

        et.write(tmp_filename, pretty_print=True)

        proc = subprocess.Popen([
            Config.exe_path,
            'sign',
            '-f' + tmp_filename,
            '-o' + tmp_signed_filename,
            '-v',
        ], stdout=subprocess.PIPE)
        output = proc.stdout.read()
        print(output.decode('CP866'))

        newenvelope = etree.parse(tmp_signed_filename)

        os.remove(tmp_filename)
        os.remove(tmp_signed_filename)

        return newenvelope, http_headers

我尝试过这样的代码：

loop = asyncio.get_running_loop()
proc = loop.subprocess_exec(
    Config.exe_path,
    'sign',
    '-f' + tmp_filename,
    '-o' + tmp_signed_filename,
    '-v',
stdout=asyncio.subprocess.PIPE)

loop.run_until_complete(proc)

但返回错误：

  

RuntimeError：此事件循环已在运行

如何在Zeep插件中使用asyncio库？