bitbake/server: Add the none server back for now

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/lib/bb/server/none.py b/lib/bb/server/none.py
new file mode 100644 (file)
index 0000000..3be7b1d
--- /dev/null
+++ b/lib/bb/server/none.py
@@ -0,0 +1,203 @@
+#
+# 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 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(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)
+