view libervia/cli/cmd_pipe.py @ 4167:319a0e47dc8b

plugin ad-hoc D-Bus: fix deprecated use of python-dbus: the plugin was using python-dbus which is deprecated in the backend in the favor of TxDBus. Methods calls have been updated, and the plugin works again, but there seems to be still some issues (warnings in the logs). Those will be fixed later.
author Goffi <goffi@goffi.org>
date Fri, 01 Dec 2023 15:22:55 +0100
parents 47401850dec6
children 0d7bb4df2343
line wrap: on
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#!/usr/bin/env python3


# Libervia CLI
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import asyncio
import errno
from functools import partial
import socket
import sys

from libervia.backend.core.i18n import _
from libervia.backend.tools.common import data_format
from libervia.cli import base
from libervia.cli import xmlui_manager
from libervia.cli.constants import Const as C
from libervia.frontends.tools import jid

__commands__ = ["Pipe"]

START_PORT = 9999


class PipeOut(base.CommandBase):
    def __init__(self, host):
        super(PipeOut, self).__init__(host, "out", help=_("send a pipe a stream"))

    def add_parser_options(self):
        self.parser.add_argument(
            "jid", help=_("the destination jid")
        )

    async def start(self):
        """ Create named pipe, and send stdin to it """
        try:
            port = await self.host.bridge.stream_out(
                await self.host.get_full_jid(self.args.jid),
                self.profile,
            )
        except Exception as e:
            self.disp(f"can't start stream: {e}", error=True)
            self.host.quit(C.EXIT_BRIDGE_ERRBACK)
        else:
            # FIXME: we use temporarily blocking code here, as it simplify
            #        asyncio port: "loop.connect_read_pipe(lambda: reader_protocol,
            #        sys.stdin.buffer)" doesn't work properly when a file is piped in
            #        (we get a "ValueError: Pipe transport is for pipes/sockets only.")
            #        while it's working well for simple text sending.

            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.connect(("127.0.0.1", int(port)))

            while True:
                buf = sys.stdin.buffer.read(4096)
                if not buf:
                    break
                try:
                    s.sendall(buf)
                except socket.error as e:
                    if e.errno == errno.EPIPE:
                        sys.stderr.write(f"e\n")
                        self.host.quit(1)
                    else:
                        raise e
            self.host.quit()


async def handle_stream_in(reader, writer, host):
    """Write all received data to stdout"""
    while True:
        data = await reader.read(4096)
        if not data:
            break
        sys.stdout.buffer.write(data)
        try:
            sys.stdout.flush()
        except IOError as e:
            sys.stderr.write(f"{e}\n")
            break
    host.quit_from_signal()


class PipeIn(base.CommandAnswering):
    def __init__(self, host):
        super(PipeIn, self).__init__(host, "in", help=_("receive a pipe stream"))
        self.action_callbacks = {"STREAM": self.on_stream_action}

    def add_parser_options(self):
        self.parser.add_argument(
            "jids",
            nargs="*",
            help=_('Jids accepted (none means "accept everything")'),
        )

    def get_xmlui_id(self, action_data):
        try:
            xml_ui = action_data["xmlui"]
        except KeyError:
            self.disp(_("Action has no XMLUI"), 1)
        else:
            ui = xmlui_manager.create(self.host, xml_ui)
            if not ui.submit_id:
                self.disp(_("Invalid XMLUI received"), error=True)
                self.quit_from_signal(C.EXIT_INTERNAL_ERROR)
            return ui.submit_id

    async def on_stream_action(self, action_data, action_id, security_limit, profile):
        xmlui_id = self.get_xmlui_id(action_data)
        if xmlui_id is None:
            self.host.quit_from_signal(C.EXIT_ERROR)
        try:
            from_jid = jid.JID(action_data["from_jid"])
        except KeyError:
            self.disp(_("Ignoring action without from_jid data"), error=True)
            return

        if not self.bare_jids or from_jid.bare in self.bare_jids:
            host, port = "localhost", START_PORT
            while True:
                try:
                    server = await asyncio.start_server(
                        partial(handle_stream_in, host=self.host), host, port)
                except socket.error as e:
                    if e.errno == errno.EADDRINUSE:
                        port += 1
                    else:
                        raise e
                else:
                    break
            xmlui_data = {"answer": C.BOOL_TRUE, "port": str(port)}
            await self.host.bridge.action_launch(
                xmlui_id, data_format.serialise(xmlui_data), profile_key=profile
            )
            async with server:
                await server.serve_forever()
            self.host.quit_from_signal()

    async def start(self):
        self.bare_jids = [jid.JID(jid_).bare for jid_ in self.args.jids]
        await self.start_answering()


class Pipe(base.CommandBase):
    subcommands = (PipeOut, PipeIn)

    def __init__(self, host):
        super(Pipe, self).__init__(
            host, "pipe", use_profile=False, help=_("stream piping through XMPP")
        )