summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/server/none.py
blob: 6083631fe7702b4c37e8e828186293a911544d44 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
#
# BitBake 'dummy' Passthrough Server
#
# 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.

"""
    This module implements a passthrough server for BitBake.

    Use register_idle_function() to add a function which the server
    calls from within idle_commands when no requests are pending. Make sure
    that those functions are non-blocking or else you will introduce latency
    in the server's main loop.
"""

import time
import bb
import pickle
import signal

DEBUG = False

import inspect, select

class BitBakeServerCommands():
    def __init__(self, server):
        self.server = server

    def runCommand(self, command):
        """
        Run a cooker command on the server
        """
        #print "Running Command %s" % command
        return self.cooker.command.runCommand(command)

    def terminateServer(self):
        """
        Trigger the server to quit
        """
        self.server.server_exit()
        #print "Server (cooker) exitting"
        return

    def ping(self):
        """
        Dummy method which can be used to check the server is still alive
        """
        return True

eventQueue = []

class BBUIEventQueue:
    class event:
        def __init__(self, parent):
            self.parent = parent
        @staticmethod
        def send(event):
            bb.server.none.eventQueue.append(pickle.loads(event))
        @staticmethod
        def quit():
            return

    def __init__(self, BBServer):
        self.eventQueue = bb.server.none.eventQueue
        self.BBServer = BBServer
        self.EventHandle = bb.event.register_UIHhandler(self)

    def __popEvent(self):
        if len(self.eventQueue) == 0:
            return None
        return self.eventQueue.pop(0)

    def getEvent(self):
        if len(self.eventQueue) == 0:
          self.BBServer.idle_commands(0)
        return self.__popEvent()

    def waitEvent(self, delay):
        event = self.__popEvent()
        if event:
            return event
        self.BBServer.idle_commands(delay)
        return self.__popEvent()

    def queue_event(self, event):
        self.eventQueue.append(event)

    def system_quit( self ):
        bb.event.unregister_UIHhandler(self.EventHandle)

# Dummy signal handler to ensure we break out of sleep upon SIGCHLD
def chldhandler(signum, stackframe):
    pass

class BitBakeNoneServer():
    # remove this when you're done with debugging
    # allow_reuse_address = True

    def __init__(self):
        self._idlefuns = {}
        self.commands = BitBakeServerCommands(self)

    def addcooker(self, cooker):
        self.cooker = cooker
        self.commands.cooker = cooker

    def register_idle_function(self, function, data):
        """Register a function to be called while the server is idle"""
        assert hasattr(function, '__call__')
        self._idlefuns[function] = data

    def idle_commands(self, delay):
        #print "Idle queue length %s" % len(self._idlefuns)
        #print "Idle timeout, running idle functions"
        #if len(self._idlefuns) == 0:
        nextsleep = delay
        for function, data in self._idlefuns.items():
            try:
                retval = function(self, data, False)
                #print "Idle function returned %s" % (retval)
                if retval is False:
                    del self._idlefuns[function]
                elif retval is True:
                    nextsleep = None
                elif nextsleep is None:
                    continue
                elif retval < nextsleep:
                    nextsleep = retval
            except SystemExit:
                raise
            except:
                import traceback
                traceback.print_exc()
                self.commands.runCommand(["stateShutdown"])
                pass
        if nextsleep is not None:
            #print "Sleeping for %s (%s)" % (nextsleep, delay)
            signal.signal(signal.SIGCHLD, chldhandler)
            time.sleep(nextsleep)
            signal.signal(signal.SIGCHLD, signal.SIG_DFL)

    def server_exit(self):
        # Tell idle functions we're exiting
        for function, data in self._idlefuns.items():
            try:
                retval = function(self, data, True)
            except:
                pass

class BitBakeServerConnection():
    def __init__(self, server):
        self.server = server.server
        self.connection = self.server.commands
        self.events = bb.server.none.BBUIEventQueue(self.server)
        for event in bb.event.ui_queue:
            self.events.queue_event(event)

    def terminate(self):
        try:
            self.events.system_quit()
        except:
            pass
        try:
            self.connection.terminateServer()
        except:
            pass

class BitBakeServer(object):
    def initServer(self):
        self.server = BitBakeNoneServer()

    def addcooker(self, cooker):
        self.cooker = cooker
        self.server.addcooker(cooker)

    def getServerIdleCB(self):
        return self.server.register_idle_function

    def saveConnectionDetails(self):
        return

    def detach(self, cooker_logfile):
        self.logfile = cooker_logfile

    def establishConnection(self):
        self.connection = BitBakeServerConnection(self)
        return self.connection

    def launchUI(self, uifunc, *args):
        return bb.cooker.server_main(self.cooker, uifunc, *args)