runtime/eRPCServer.py
author Edouard Tisserant <edouard@beremiz.fr>
Fri, 23 Feb 2024 11:54:51 +0100
changeset 3901 b8b3573475e7
parent 3898 de4f17d737a9
child 3905 d47fe28d799a
permissions -rw-r--r--
Fix SVGHMI build exception on windows: return bytes for inkscape path in docsvg.
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Written by Edouard TISSERANT (C) 2024
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# This file is part of Beremiz runtime
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# See COPYING.Runtime file for copyrights details.
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import sys
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import traceback
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from inspect import getmembers, isfunction
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import erpc
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# eRPC service code
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from erpc_interface.erpc_PLCObject.common import PSKID, PLCstatus, TraceVariables, trace_sample, PLCstatus_enum, log_message
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from erpc_interface.erpc_PLCObject.interface import IBeremizPLCObjectService
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from erpc_interface.erpc_PLCObject.server import BeremizPLCObjectServiceService
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from runtime import GetPLCObjectSingleton as PLC
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from runtime.loglevels import LogLevelsDict
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from runtime.ServicePublisher import ServicePublisher
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CRITICAL_LOG_LEVEL = LogLevelsDict["CRITICAL"]
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def ReturnAsLastOutput(method, args_wrapper, *args):
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    args[-1].value = method(*args_wrapper(*args[:-1]))
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    return 0
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def TranslatedReturnAsLastOutput(translator):
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    def wrapper(method, args_wrapper, *args):
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        args[-1].value = translator(method(*args_wrapper(*args[:-1])))
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        return 0
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    return wrapper
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ReturnWrappers = {
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    "AppendChunkToBlob":ReturnAsLastOutput,
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    "GetLogMessage":TranslatedReturnAsLastOutput(
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        lambda res:log_message(*res)),
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    "GetPLCID":TranslatedReturnAsLastOutput(
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        lambda res:PSKID(*res)),
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    "GetPLCstatus":TranslatedReturnAsLastOutput(
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        lambda res:PLCstatus(getattr(PLCstatus_enum, res[0]),res[1])),
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    "GetTraceVariables":TranslatedReturnAsLastOutput(
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        lambda res:TraceVariables(getattr(PLCstatus_enum, res[0]),[trace_sample(*sample) for sample in res[1]])),
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    "MatchMD5":ReturnAsLastOutput,
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    "NewPLC":ReturnAsLastOutput,
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    "SeedBlob":ReturnAsLastOutput,
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    "SetTraceVariablesList": ReturnAsLastOutput,
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    "StopPLC":ReturnAsLastOutput,
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}
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ArgsWrappers = {
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    "AppendChunkToBlob":
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        lambda data, blobID:(data, bytes(blobID)),
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    "NewPLC":
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        lambda md5sum, plcObjectBlobID, extrafiles: (
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            md5sum, bytes(plcObjectBlobID), [(f.fname, bytes(f.blobID)) for f in extrafiles]),
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    "SetTraceVariablesList": 
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        lambda orders : ([(order.idx, None if len(order.force)==0 else bytes(order.force)) for order in orders],)
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}
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def rpc_wrapper(method_name):
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    PLCobj = PLC()
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    method=getattr(PLCobj, method_name)
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    args_wrapper = ArgsWrappers.get(method_name, lambda *x:x)
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    return_wrapper = ReturnWrappers.get(method_name,
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        lambda method, args_wrapper, *args: method(*args_wrapper(*args)))
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    def exception_wrapper(self, *args):
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        try:
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            return_wrapper(method, args_wrapper, *args)
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            return 0
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        except Exception as e:
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            print(traceback.format_exc())
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            PLCobj.LogMessage(CRITICAL_LOG_LEVEL, f'eRPC call {method_name} Exception "{str(e)}"')
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            raise
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    return exception_wrapper
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class eRPCServer(object):
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    def __init__(self, servicename, ip_addr, port):
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        self.continueloop = True
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        self.server = None
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        self.transport = None
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        self.servicename = servicename
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        self.ip_addr = ip_addr
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        self.port = port
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        self.servicepublisher = None
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    def _to_be_published(self):
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        return self.servicename is not None and \
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               self.ip_addr not in ["", "localhost", "127.0.0.1"]
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    def PrintServerInfo(self):
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        print(_("eRPC port :"), self.port)
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        if self._to_be_published():
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            print(_("Publishing service on local network"))
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        if sys.stdout:
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            sys.stdout.flush()
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    def Loop(self, when_ready):
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        if self._to_be_published():
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            self.Publish()
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        while self.continueloop:
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            # service handler calls PLC object though erpc_stubs's wrappers
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            handler = type(
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                "PLCObjectServiceHandlder", 
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                (IBeremizPLCObjectService,),
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                {name: rpc_wrapper(name)              
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                        for name,_func in getmembers(IBeremizPLCObjectService, isfunction)})()
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            service = BeremizPLCObjectServiceService(handler)
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            # TODO initialize Serial transport layer if selected
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            # transport = erpc.transport.SerialTransport(device, baudrate)
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            # initialize TCP transport layer
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            self.transport = erpc.transport.TCPTransport(self.ip_addr, int(self.port), True)
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            self.server = erpc.simple_server.SimpleServer(self.transport, erpc.basic_codec.BasicCodec)
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            self.server.add_service(service)
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            when_ready()
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            self.server.run()
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        self.Unpublish()
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    def Restart(self):
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        self.server.stop()
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        self.transport.stop()
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    def Quit(self):
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        self.continueloop = False
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        self.server.stop()
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        self.transport.stop()
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    def Publish(self):
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        self.servicepublisher = ServicePublisher("ERPC")
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        self.servicepublisher.RegisterService(self.servicename,
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                                              self.ip_addr, self.port)
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    def Unpublish(self):
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        if self.servicepublisher is not None:
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            self.servicepublisher.UnRegisterService()
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            self.servicepublisher = None