Add help messages and command listing to dispatcher handlers.

[software/pymin.git] / pymindaemon.py

diff --git a/pymindaemon.py b/pymindaemon.py
index b7c64e4104bbe8a2376ae315910a8e7df5c4f055..f3f45fbd38d90581ffc01af351045c1c97a4e7e2 100644 (file)
--- a/pymindaemon.py
+++ b/pymindaemon.py
@@ -10,10 +10,12 @@ command-line.
 
 import signal
 import socket
-from dispatcher import Dispatcher
-from eventloop import EventLoop, LoopInterruptedError
 
-class PyminDaemon(EventLoop):
+import dispatcher
+import eventloop
+import serializer
+
+class PyminDaemon(eventloop.EventLoop):
     r"""PyminDaemon(bind_addr, routes) -> PyminDaemon instance
 
     This class is well suited to run as a single process. It handles
@@ -31,7 +33,7 @@ class PyminDaemon(EventLoop):
     >>> PyminDaemon(('', 9999), dict(test=test_handler)).run()
     """
 
-    def __init__(self, bind_addr, routes):
+    def __init__(self, routes=dict(), bind_addr=('', 9999)):
         r"""Initialize the PyminDaemon object.
 
         See PyminDaemon class documentation for more info.
@@ -41,13 +43,13 @@ class PyminDaemon(EventLoop):
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
         sock.bind(bind_addr)
         # Create EventLoop
-        EventLoop.__init__(self, sock)
+        eventloop.EventLoop.__init__(self, sock)
         # Create Dispatcher
-        self.dispatcher = Dispatcher(routes)
+        self.dispatcher = dispatcher.Dispatcher(routes)
         # Signal handling
         def quit(signum, frame):
             print "Shuting down ..."
-            loop.stop() # tell main event loop to stop
+            self.stop() # tell main event loop to stop
         def reload_config(signum, frame):
             print "Reloading configuration..."
             # TODO iterate handlers list propagating reload action
@@ -58,25 +60,42 @@ class PyminDaemon(EventLoop):
     def handle(self):
         r"handle() -> None :: Handle incoming events using the dispatcher."
         (msg, addr) = self.file.recvfrom(65535)
-        self.dispatcher.dispatch(msg)
-        #try:
-        #    d.dispatch(msg)
-        #except dis.BadRouteError, inst:
-        #    sock.sendto('Bad route from : ' + inst.cmd + '\n', addr)
-        #except dis.CommandNotFoundError, inst:
-        #    sock.sendto('Command not found : ' + inst.cmd + '\n', addr)
+        try:
+            result = self.dispatcher.dispatch(msg)
+            if result is not None:
+                result = serializer.serialize(result)
+            response = u'OK '
+        except dispatcher.Error, e:
+            result = unicode(e) + u'\n'
+            response = u'ERROR '
+        except Exception, e:
+            import traceback
+            result = u'Internal server error\n'
+            traceback.print_exc() # TODO logging!
+            response = u'ERROR '
+        if result is None:
+            response += u'0'
+        else:
+            response += u'%d\n%s' % (len(result), result)
+        self.file.sendto(response, addr)
 
     def run(self):
         r"run() -> None :: Run the event loop (shortcut to loop())"
         try:
             return self.loop()
-        except LoopInterruptedError, e:
+        except eventloop.LoopInterruptedError, e:
             pass
 
 if __name__ == '__main__':
 
+    @handler(u"Print all the arguments, return nothing.")
     def test_handler(*args):
         print 'test:', args
 
-    PyminDaemon(('', 9999), dict(test=test_handler)).run()
+    @handler(u"Echo the message passed as argument.")
+    def echo_handler(message):
+        print 'echo:', message
+        return message
+
+    PyminDaemon(dict(test=test_handler, echo=echo_handler)).run()