2bb96bea70
Also implement lots of fixes and improvements. fixes: #3381 Change-Id: Ibe6664da00756ae5813b90f190295045808b2ff0
308 lines
12 KiB
Python
308 lines
12 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
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#
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# *****************************************************************************
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"""Encoding/decoding Messages"""
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# implement as class as they may need some internal 'state' later on
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# (think compressors)
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from __future__ import print_function
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from secop.lib.parsing import format_time
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from secop.protocol.encoding import MessageEncoder
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from secop.protocol.messages import *
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#from secop.protocol.errors import ProtocolError
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import ast
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import re
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import json
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# each message is like <messagetype> [ \space <messageargs> [ \space
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# <json> ]] \lf
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# note: the regex allow <> for spec for testing only!
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DEMO_RE = re.compile(
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r"""^(?P<msgtype>[\*\?\w]+)(?:\s(?P<spec>[\w:<>]+)(?:\s(?P<json>.*))?)?$""",
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re.X)
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#"""
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# messagetypes:
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IDENTREQUEST = '*IDN?' # literal
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# literal! first part is fixed!
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#IDENTREPLY = 'SECoP, SECoPTCP, V2016-11-30, rc1'
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#IDENTREPLY = 'SINE2020&ISSE,SECoP,V2016-11-30,rc1'
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IDENTREPLY = 'SINE2020&ISSE,SECoP,V2017-01-25,rc1'
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DESCRIPTIONSREQUEST = 'describe' # literal
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DESCRIPTIONREPLY = 'describing' # +<id> +json
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ENABLEEVENTSREQUEST = 'activate' # literal
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ENABLEEVENTSREPLY = 'active' # literal, is end-of-initial-data-transfer
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DISABLEEVENTSREQUEST = 'deactivate' # literal
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DISABLEEVENTSREPLY = 'inactive' # literal
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COMMANDREQUEST = 'do' # +module:command +json args (if needed)
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# +module:command +json args (if needed) # send after the command finished !
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COMMANDREPLY = 'done'
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# +module[:parameter] +json_value -> NO direct reply, calls TRIGGER internally!
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WRITEREQUEST = 'change'
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# +module[:parameter] +json_value # send with the read back value
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WRITEREPLY = 'changed'
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# +module[:parameter] -> NO direct reply, calls TRIGGER internally!
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TRIGGERREQUEST = 'read'
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EVENT = 'update' # +module[:parameter] +json_value (value, qualifiers_as_dict)
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HEARTBEATREQUEST = 'ping' # +nonce_without_space
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HEARTBEATREPLY = 'pong' # +nonce_without_space
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ERRORREPLY = 'error' # +errorclass +json_extended_info
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HELPREQUEST = 'help' # literal
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HELPREPLY = 'helping' # +line number +json_text
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ERRORCLASSES = [
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'NoSuchDevice',
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'NoSuchParameter',
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'NoSuchCommand',
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'CommandFailed',
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'ReadOnly',
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'BadValue',
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'CommunicationFailed',
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'IsBusy',
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'IsError',
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'ProtocolError',
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'InternalError',
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'CommandRunning',
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'Disabled',
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]
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# note: above strings need to be unique in the sense, that none is/or
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# starts with another
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def encode_cmd_result(msgobj):
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q = msgobj.qualifiers.copy()
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if 't' in q:
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q['t'] = format_time(q['t'])
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return msgobj.result, q
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def encode_value_data(vobj):
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q = vobj.qualifiers.copy()
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if 't' in q:
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q['t'] = format_time(q['t'])
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return vobj.value, q
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def encode_error_msg(emsg):
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# note: result is JSON-ified....
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return [
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emsg.origin, dict((k, getattr(emsg, k)) for k in emsg.ARGS
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if k != 'origin')
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]
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class DemoEncoder(MessageEncoder):
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# map of msg to msgtype string as defined above.
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ENCODEMAP = {
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IdentifyRequest: (IDENTREQUEST, ),
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IdentifyReply: (IDENTREPLY, ),
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DescribeRequest: (DESCRIPTIONSREQUEST, ),
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DescribeReply: (
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DESCRIPTIONREPLY,
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'equipment_id',
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'description', ),
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ActivateRequest: (ENABLEEVENTSREQUEST, ),
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ActivateReply: (ENABLEEVENTSREPLY, ),
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DeactivateRequest: (DISABLEEVENTSREQUEST, ),
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DeactivateReply: (DISABLEEVENTSREPLY, ),
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CommandRequest: (
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COMMANDREQUEST,
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lambda msg: "%s:%s" % (msg.module, msg.command),
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'arguments', ),
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CommandReply: (
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COMMANDREPLY,
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lambda msg: "%s:%s" % (msg.module, msg.command),
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encode_cmd_result, ),
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WriteRequest: (
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WRITEREQUEST,
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lambda msg: "%s:%s" % (
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msg.module, msg.parameter) if msg.parameter else msg.module,
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'value', ),
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WriteReply: (
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WRITEREPLY,
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lambda msg: "%s:%s" % (
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msg.module, msg.parameter) if msg.parameter else msg.module,
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'value', ),
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PollRequest: (
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TRIGGERREQUEST,
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lambda msg: "%s:%s" % (
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msg.module, msg.parameter) if msg.parameter else msg.module,
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),
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HeartbeatRequest: (
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HEARTBEATREQUEST,
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'nonce', ),
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HeartbeatReply: (
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HEARTBEATREPLY,
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'nonce', ),
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HelpMessage: (HELPREQUEST, ),
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ErrorMessage: (
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ERRORREPLY,
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"errorclass",
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encode_error_msg, ),
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Value: (
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EVENT,
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lambda msg: "%s:%s" % (msg.module, msg.parameter or (
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msg.command + '()')) if msg.parameter or msg.command else msg.module,
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encode_value_data, ),
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}
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DECODEMAP = {
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IDENTREQUEST: lambda spec, data: IdentifyRequest(),
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# handled specially, listed here for completeness
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IDENTREPLY: lambda spec, data: IdentifyReply(encoded),
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DESCRIPTIONSREQUEST: lambda spec, data: DescribeRequest(),
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DESCRIPTIONREPLY: lambda spec, data: DescribeReply(equipment_id=spec[0], description=data),
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ENABLEEVENTSREQUEST: lambda spec, data: ActivateRequest(),
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ENABLEEVENTSREPLY: lambda spec, data: ActivateReply(),
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DISABLEEVENTSREQUEST: lambda spec, data: DeactivateRequest(),
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DISABLEEVENTSREPLY: lambda spec, data: DeactivateReply(),
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COMMANDREQUEST: lambda spec, data: CommandRequest(module=spec[0], command=spec[1], arguments=data),
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COMMANDREPLY: lambda spec, data: CommandReply(module=spec[0], command=spec[1], result=data),
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WRITEREQUEST: lambda spec, data: WriteRequest(module=spec[0], parameter=spec[1], value=data),
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WRITEREPLY: lambda spec, data: WriteReply(module=spec[0], parameter=spec[1], value=data),
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TRIGGERREQUEST: lambda spec, data: PollRequest(module=spec[0], parameter=spec[1]),
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HEARTBEATREQUEST: lambda spec, data: HeartbeatRequest(nonce=spec[0]),
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HEARTBEATREPLY: lambda spec, data: HeartbeatReply(nonce=spec[0]),
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HELPREQUEST: lambda spec, data: HelpMessage(),
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# HELPREPLY: lambda spec, data:None, # ignore this
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ERRORREPLY: lambda spec, data: ErrorMessage(errorclass=spec[0], errorinfo=data),
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EVENT: lambda spec, data: Value(module=spec[0], parameter=spec[1], value=data[0], qualifiers=data[1] if len(data) > 1 else {}),
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}
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def __init__(self, *args, **kwds):
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MessageEncoder.__init__(self, *args, **kwds)
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# self.tests()
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def encode(self, msg):
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"""msg object -> transport layer message"""
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# fun for Humans
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if isinstance(msg, HelpMessage):
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text = """Try one of the following:
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'%s' to query protocol version
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'%s' to read the description
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'%s <module>[:<parameter>]' to request reading a value
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'%s <module>[:<parameter>] value' to request changing a value
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'%s <module>[:<command>()]' to execute a command
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'%s <nonce>' to request a heartbeat response
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'%s' to activate async updates
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'%s' to deactivate updates
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""" % (IDENTREQUEST, DESCRIPTIONSREQUEST, TRIGGERREQUEST,
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WRITEREQUEST, COMMANDREQUEST, HEARTBEATREQUEST,
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ENABLEEVENTSREQUEST, DISABLEEVENTSREQUEST)
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return '\n'.join('%s %d %s' % (HELPREPLY, i + 1, l.strip())
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for i, l in enumerate(text.split('\n')[:-1]))
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if isinstance(msg, HeartbeatRequest):
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if msg.nonce:
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return 'ping %s' % msg.nonce
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return 'ping'
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if isinstance(msg, HeartbeatReply):
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if msg.nonce:
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return 'pong %s' % msg.nonce
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return 'pong'
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for msgcls, parts in self.ENCODEMAP.items():
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if isinstance(msg, msgcls):
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# resolve lambdas
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parts = [parts[0]] + [
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p(msg) if callable(p) else getattr(msg, p)
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for p in parts[1:]
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]
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if len(parts) > 1:
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parts[1] = str(parts[1])
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if len(parts) == 3:
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parts[2] = json.dumps(parts[2])
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return ' '.join(parts)
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def decode(self, encoded):
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# first check beginning
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match = DEMO_RE.match(encoded)
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if not match:
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print(repr(encoded), repr(IDENTREPLY))
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if encoded == IDENTREPLY: # XXX:better just check the first 2 parts...
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return IdentifyReply(version_string=encoded)
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return HelpMessage()
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# return ErrorMessage(errorclass='Protocol',
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# errorinfo='Regex did not match!',
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# is_request=True)
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msgtype, msgspec, data = match.groups()
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if msgspec is None and data:
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return ErrorMessage(
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errorclass='Internal',
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errorinfo='Regex matched json, but not spec!',
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is_request=True,
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origin=encoded)
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if msgtype in self.DECODEMAP:
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if msgspec and ':' in msgspec:
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msgspec = msgspec.split(':', 1)
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else:
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msgspec = (msgspec, None)
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if data:
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try:
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data = json.loads(data)
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except ValueError as err:
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return ErrorMessage(
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errorclass='BadValue',
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errorinfo=[repr(err), str(encoded)],
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origin=encoded)
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msg = self.DECODEMAP[msgtype](msgspec, data)
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msg.setvalue("origin", encoded)
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return msg
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return ErrorMessage(
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errorclass='Protocol',
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errorinfo='%r: No Such Messagetype defined!' % encoded,
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is_request=True,
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origin=encoded)
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def tests(self):
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print("---- Testing encoding -----")
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for msgclass, parts in sorted(self.ENCODEMAP.items()):
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print(msgclass)
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e = self.encode(
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msgclass(
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module='<module>',
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parameter='<paramname>',
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value=2.718,
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equipment_id='<id>',
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description='descriptive data',
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command='<cmd>',
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arguments='<arguments>',
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nonce='<nonce>',
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errorclass='InternalError',
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errorinfo='nix'))
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print(e)
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print(self.decode(e))
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print()
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print("---- Testing decoding -----")
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for msgtype, _ in sorted(self.DECODEMAP.items()):
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msg = '%s a:b 3' % msgtype
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if msgtype == EVENT:
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msg = '%s a:b [3,{"t":193868}]' % msgtype
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print(msg)
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d = self.decode(msg)
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print(d)
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print(self.encode(d))
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print()
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print("---- Testing done -----")
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