view sat_frontends/jp/cmd_pipe.py @ 3513:753d151da886

XEP-0277: new preview/mbPreview method: This method does more or less the same thing as sending, but without actually sending the item, and parse the generated element just after. This way, the triggers are run, and a preview of the item can be made for the resulting microblog data.
author Goffi <goffi@goffi.org>
date Thu, 29 Apr 2021 15:49:59 +0200
parents be6d91572633
children 524856bd7b19
line wrap: on
line source

#!/usr/bin/env python3


# jp: a SAT command line tool
# 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 socket
import asyncio
import errno
from functools import partial
from sat_frontends.jp import base
from sat_frontends.jp.constants import Const as C
from sat_frontends.jp import xmlui_manager
import sys
from sat.core.i18n import _
from sat_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.streamOut(
                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.quitFromSignal()


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

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

    def getXmluiId(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.quitFromSignal(C.EXIT_INTERNAL_ERROR)
            return ui.submit_id

    async def onStreamAction(self, action_data, action_id, security_limit, profile):
        xmlui_id = self.getXmluiId(action_data)
        if xmlui_id is None:
            self.host.quitFromSignal(C.EXIT_ERROR)
        try:
            from_jid = jid.JID(action_data["meta_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.launchAction(
                xmlui_id, xmlui_data, profile_key=profile)
            async with server:
                await server.serve_forever()
            self.host.quitFromSignal()

    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")
        )