Method _wait_frontend

reflex/testing.py:383–416

(self)

        )

    def _wait_frontend(self):
        if self.frontend_process is None or self.frontend_process.stdout is None:
            msg = "Frontend process has no stdout."
            raise RuntimeError(msg)
        while self.frontend_url is None:
            line = self.frontend_process.stdout.readline()
            if not line:
                break
            print(line)  # for pytest diagnosis #noqa: T201
            m = re.search(reflex.constants.ReactRouter.FRONTEND_LISTENING_REGEX, line)
            if m is not None:
                self.frontend_url = m.group(1)
                config = get_config()
                config.deploy_url = self.frontend_url
                break
        if self.frontend_url is None:
            msg = "Frontend did not start"
            raise RuntimeError(msg)

        def consume_frontend_output():
            while True:
                try:
                    line = (
                        self.frontend_process.stdout.readline()  # pyright: ignore [reportOptionalMemberAccess]
                    )
                # catch I/O operation on closed file.
                except ValueError as e:
                    console.error(str(e))
                    break
                if not line:
                    break

        self.frontend_output_thread = threading.Thread(target=consume_frontend_output)
        self.frontend_output_thread.start()

    def start(self) -> Self:
        """Start the backend in a new thread and dev frontend as a separate process.