reworking messages

1) start 'bin/secop-server test'
2) connect to localhost port 10767
3) enter help<enter>
4) enjoy

Change-Id: I488d5f9cdca8c91c583691ab23f541a4a8759f4e

secop/protocol/encoding/demo_v2.py

@@ -0,0 +1,102 @@
+#!/usr/bin/env python
+#  -*- coding: utf-8 -*-
+# *****************************************************************************
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 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 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.,
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Module authors:
+#   Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
+#
+# *****************************************************************************
+
+"""Encoding/decoding Messages"""
+
+# implement as class as they may need some internal 'state' later on
+# (think compressors)
+
+from secop.protocol.encoding import MessageEncoder
+from secop.protocol import messages
+from secop.lib.parsing import *
+
+import re
+
+DEMO_RE = re.compile(
+    r'^([!+-])?(\*|[a-z_][a-z_0-9]*)?(?:\:(\*|[a-z_][a-z_0-9]*))?(?:\:(\*|[a-z_][a-z_0-9]*))?(?:\=(.*))?')
+
+
+class DemoEncoder(MessageEncoder):
+
+    def decode(sef, encoded):
+        # match [!][*|devicename][: *|paramname [: *|propname]] [=value]
+        match = DEMO_RE.match(encoded)
+        if match:
+            novalue, devname, pname, propname, assign = match.groups()
+            if assign:
+                print "parsing", assign,
+                assign = parse_args(assign)
+                print "->", assign
+            return messages.DemoRequest(
+                novalue, devname, pname, propname, assign)
+        return messages.HelpRequest()
+
+    def encode(self, msg):
+        if isinstance(msg, messages.DemoReply):
+            return msg.lines
+        handler_name = '_encode_' + msg.__class__.__name__
+        handler = getattr(self, handler_name, None)
+        if handler is None:
+            print "Handler %s not yet implemented!" % handler_name
+        try:
+            args = dict((k, msg.__dict__[k]) for k in msg.ARGS)
+            result = handler(**args)
+        except Exception as e:
+            print "Error encoding %r with %r!" % (msg, handler)
+            print e
+            return '~InternalError~'
+        return result
+
+    def _encode_AsyncDataUnit(self, devname, pname, value, timestamp,
+                              error=None, unit=''):
+        return '#%s:%s=%s;t=%.3f' % (devname, pname, value, timestamp)
+
+    def _encode_Error(self, error):
+        return '~Error~ %r' % error
+
+    def _encode_InternalError(self, error):
+        return '~InternalError~ %r' % error
+
+    def _encode_ProtocollError(self, msgtype, msgname, msgargs):
+        return '~ProtocolError~ %s.%s.%r' % (msgtype, msgname, msgargs)
+
+    def _encode_NoSuchDeviceError(self, device):
+        return '~NoSuchDeviceError~ %s' % device
+
+    def _encode_NoSuchParamError(self, device, param):
+        return '~NoSuchParameterError~ %s:%s' % (device, param)
+
+    def _encode_ParamReadonlyError(self, device, param):
+        return '~ParamReadOnlyError~ %s:%s' % (device, param)
+
+    def _encode_NoSuchCommandError(self, device, command):
+        return '~NoSuchCommandError~ %s.%s' % (device, command)
+
+    def _encode_CommandFailedError(self, device, command):
+        return '~CommandFailedError~ %s.%s' % (device, command)
+
+    def _encode_InvalidParamValueError(self, device, param, value):
+        return '~InvalidValueForParamError~ %s:%s=%r' % (device, param, value)
+
+    def _encode_HelpReply(self):
+        return ['Help not yet implemented!',
+                'ask Markus Zolliker about the protocol']