citadel/bitbake/lib/bb/server/xmlrpcclient.py

#
# BitBake XMLRPC Client Interface
#
# Copyright (C) 2006 - 2007  Michael 'Mickey' Lauer
# Copyright (C) 2006 - 2008  Richard Purdie
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import os
import sys

import socket
import http.client
import xmlrpc.client

import bb
from bb.ui import uievent

class BBTransport(xmlrpc.client.Transport):
    def __init__(self, timeout):
        self.timeout = timeout
        self.connection_token = None
        xmlrpc.client.Transport.__init__(self)

    # Modified from default to pass timeout to HTTPConnection
    def make_connection(self, host):
        #return an existing connection if possible.  This allows
        #HTTP/1.1 keep-alive.
        if self._connection and host == self._connection[0]:
            return self._connection[1]

        # create a HTTP connection object from a host descriptor
        chost, self._extra_headers, x509 = self.get_host_info(host)
        #store the host argument along with the connection object
        self._connection = host, http.client.HTTPConnection(chost, timeout=self.timeout)
        return self._connection[1]

    def set_connection_token(self, token):
        self.connection_token = token

    def send_content(self, h, body):
        if self.connection_token:
            h.putheader("Bitbake-token", self.connection_token)
        xmlrpc.client.Transport.send_content(self, h, body)

def _create_server(host, port, timeout = 60):
    t = BBTransport(timeout)
    s = xmlrpc.client.ServerProxy("http://%s:%d/" % (host, port), transport=t, allow_none=True, use_builtin_types=True)
    return s, t

def check_connection(remote, timeout):
    try:
        host, port = remote.split(":")
        port = int(port)
    except Exception as e:
        bb.warn("Failed to read remote definition (%s)" % str(e))
        raise e

    server, _transport = _create_server(host, port, timeout)
    try:
        ret, err =  server.runCommand(['getVariable', 'TOPDIR'])
        if err or not ret:
            return False
    except ConnectionError:
        return False
    return True

class BitBakeXMLRPCServerConnection(object):
    def __init__(self, host, port, clientinfo=("localhost", 0), observer_only = False, featureset = None):
        self.connection, self.transport = _create_server(host, port)
        self.clientinfo = clientinfo
        self.observer_only = observer_only
        if featureset:
            self.featureset = featureset
        else:
            self.featureset = []

        self.events = uievent.BBUIEventQueue(self.connection, self.clientinfo)

        _, error = self.connection.runCommand(["setFeatures", self.featureset])
        if error:
            # disconnect the client, we can't make the setFeature work
            self.connection.removeClient()
            # no need to log it here, the error shall be sent to the client
            raise BaseException(error)

    def connect(self, token = None):
        if token is None:
            if self.observer_only:
                token = "observer"
            else:
                token = self.connection.addClient()

        if token is None:
            return None

        self.transport.set_connection_token(token)
        return self

    def removeClient(self):
        if not self.observer_only:
            self.connection.removeClient()

    def terminate(self):
        # Don't wait for server indefinitely
        socket.setdefaulttimeout(2)
        try:
            self.events.system_quit()
        except:
            pass
        try:
            self.connection.removeClient()
        except:
            pass

def connectXMLRPC(remote, featureset, observer_only = False, token = None):
    # The format of "remote" must be "server:port"
    try:
        [host, port] = remote.split(":")
        port = int(port)
    except Exception as e:
        bb.warn("Failed to parse remote definition %s (%s)" % (remote, str(e)))
        raise e

    # We need our IP for the server connection. We get the IP
    # by trying to connect with the server
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect((host, port))
        ip = s.getsockname()[0]
        s.close()
    except Exception as e:
        bb.warn("Could not create socket for %s:%s (%s)" % (host, port, str(e)))
        raise e
    try:
        connection = BitBakeXMLRPCServerConnection(host, port, (ip, 0), observer_only, featureset)
        return connection.connect(token)
    except Exception as e:
        bb.warn("Could not connect to server at %s:%s (%s)" % (host, port, str(e)))
        raise e