351 lines
13 KiB
Python
351 lines
13 KiB
Python
#!@PYTHON@
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# -*- coding: utf-8 -*-
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# Copyright (C) 2008 David Goncalves <david@lestat.st>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# 2008-01-14 David Goncalves
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# PyNUT is an abstraction class to access NUT (Network UPS Tools) server.
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#
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# 2008-06-09 David Goncalves
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# Added 'GetRWVars' and 'SetRWVar' commands.
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#
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# 2009-02-19 David Goncalves
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# Changed class PyNUT to PyNUTClient
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#
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# 2010-07-23 David Goncalves - Version 1.2
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# Changed GetRWVars function that fails is the UPS is not
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# providing such vars.
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#
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# 2011-07-05 René Martín Rodríguez <rmrodri@ull.es> - Version 1.2.1
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# Added support for FSD, HELP and VER commands
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#
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# 2012-02-07 René Martín Rodríguez <rmrodri@ull.es> - Version 1.2.2
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# Added support for LIST CLIENTS command
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#
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# 2014-06-03 george2 - Version 1.3.0
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# Added custom exception class, fixed minor bug, added Python 3 support.
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#
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# 2021-09-27 Jim Klimov <jimklimov+nut@gmail.com> - Version 1.4.0
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# Revise strings used to be byte sequences as required by telnetlib
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# in Python 3.9, by spelling out b"STR" or str.encode('ascii');
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# the change was also tested to work with Python 2.7, 3.4, 3.5 and
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# 3.7 (to the extent of accompanying test_nutclient.py at least).
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import telnetlib
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class PyNUTError( Exception ) :
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""" Base class for custom exceptions """
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class PyNUTClient :
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""" Abstraction class to access NUT (Network UPS Tools) server """
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__debug = None # Set class to debug mode (prints everything useful for debuging...)
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__host = None
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__port = None
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__login = None
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__password = None
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__timeout = None
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__srv_handler = None
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__version = "1.4.0"
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__release = "2021-09-27"
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def __init__( self, host="127.0.0.1", port=3493, login=None, password=None, debug=False, timeout=5 ) :
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""" Class initialization method
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host : Host to connect (default to localhost)
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port : Port where NUT listens for connections (default to 3493)
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login : Login used to connect to NUT server (default to None for no authentication)
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password : Password used when using authentication (default to None)
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debug : Boolean, put class in debug mode (prints everything on console, default to False)
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timeout : Timeout used to wait for network response
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"""
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self.__debug = debug
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if self.__debug :
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print( "[DEBUG] Class initialization..." )
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print( "[DEBUG] -> Host = %s (port %s)" % ( host, port ) )
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print( "[DEBUG] -> Login = '%s' / '%s'" % ( login, password ) )
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self.__host = host
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self.__port = port
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self.__login = login
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self.__password = password
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self.__timeout = 5
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self.__connect()
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# Try to disconnect cleanly when class is deleted ;)
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def __del__( self ) :
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""" Class destructor method """
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try :
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self.__srv_handler.write( b"LOGOUT\n" )
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except :
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pass
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def __connect( self ) :
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""" Connects to the defined server
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If login/pass was specified, the class tries to authenticate. An error is raised
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if something goes wrong.
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"""
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if self.__debug :
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print( "[DEBUG] Connecting to host" )
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self.__srv_handler = telnetlib.Telnet( self.__host, self.__port )
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if self.__login != None :
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self.__srv_handler.write( ("USERNAME %s\n" % self.__login).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n", self.__timeout )
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if result[:2] != b"OK" :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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if self.__password != None :
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self.__srv_handler.write( ("PASSWORD %s\n" % self.__password).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n", self.__timeout )
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if result[:2] != b"OK" :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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def GetUPSList( self ) :
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""" Returns the list of available UPS from the NUT server
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The result is a dictionary containing 'key->val' pairs of 'UPSName' and 'UPS Description'
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"""
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if self.__debug :
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print( "[DEBUG] GetUPSList from server" )
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self.__srv_handler.write( b"LIST UPS\n" )
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result = self.__srv_handler.read_until( b"\n" )
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if result != b"BEGIN LIST UPS\n" :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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result = self.__srv_handler.read_until( b"END LIST UPS\n" )
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ups_list = {}
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for line in result.split( b"\n" ) :
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if line[:3] == b"UPS" :
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ups, desc = line[4:-1].split( b'"' )
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ups_list[ ups.replace( b" ", b"" ) ] = desc
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return( ups_list )
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def GetUPSVars( self, ups="" ) :
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""" Get all available vars from the specified UPS
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The result is a dictionary containing 'key->val' pairs of all
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available vars.
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"""
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if self.__debug :
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print( "[DEBUG] GetUPSVars called..." )
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self.__srv_handler.write( ("LIST VAR %s\n" % ups).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if result != ("BEGIN LIST VAR %s\n" % ups).encode('ascii') :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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ups_vars = {}
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result = self.__srv_handler.read_until( ("END LIST VAR %s\n" % ups).encode('ascii') )
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offset = len( ("VAR %s " % ups ).encode('ascii') )
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end_offset = 0 - ( len( ("END LIST VAR %s\n" % ups).encode('ascii') ) + 1 )
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for current in result[:end_offset].split( b"\n" ) :
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var = current[ offset: ].split( b'"' )[0].replace( b" ", b"" )
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data = current[ offset: ].split( b'"' )[1]
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ups_vars[ var ] = data
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return( ups_vars )
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def GetUPSCommands( self, ups="" ) :
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""" Get all available commands for the specified UPS
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The result is a dict object with command name as key and a description
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of the command as value
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"""
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if self.__debug :
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print( "[DEBUG] GetUPSCommands called..." )
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self.__srv_handler.write( ("LIST CMD %s\n" % ups).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if result != ("BEGIN LIST CMD %s\n" % ups).encode('ascii') :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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ups_cmds = {}
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result = self.__srv_handler.read_until( ("END LIST CMD %s\n" % ups).encode('ascii') )
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offset = len( ("CMD %s " % ups).encode('ascii') )
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end_offset = 0 - ( len( ("END LIST CMD %s\n" % ups).encode('ascii') ) + 1 )
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for current in result[:end_offset].split( b"\n" ) :
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var = current[ offset: ].split( b'"' )[0].replace( b" ", b"" )
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# For each var we try to get the available description
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try :
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self.__srv_handler.write( ("GET CMDDESC %s %s\n" % ( ups, var )).encode('ascii') )
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temp = self.__srv_handler.read_until( b"\n" )
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if temp[:7] != b"CMDDESC" :
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raise PyNUTError
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else :
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off = len( ("CMDDESC %s %s " % ( ups, var )).encode('ascii') )
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desc = temp[off:-1].split(b'"')[1]
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except :
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desc = var
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ups_cmds[ var ] = desc
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return( ups_cmds )
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def GetRWVars( self, ups="" ) :
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""" Get a list of all writable vars from the selected UPS
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The result is presented as a dictionary containing 'key->val' pairs
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"""
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if self.__debug :
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print( "[DEBUG] GetUPSVars from '%s'..." % ups )
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self.__srv_handler.write( ("LIST RW %s\n" % ups).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if ( result != ("BEGIN LIST RW %s\n" % ups).encode('ascii') ) :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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result = self.__srv_handler.read_until( ("END LIST RW %s\n" % ups).encode('ascii') )
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offset = len( ("VAR %s" % ups).encode('ascii') )
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end_offset = 0 - ( len( ("END LIST RW %s\n" % ups).encode('ascii') ) + 1 )
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rw_vars = {}
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try :
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for current in result[:end_offset].split( b"\n" ) :
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var = current[ offset: ].split( b'"' )[0].replace( b" ", b"" )
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data = current[ offset: ].split( b'"' )[1]
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rw_vars[ var ] = data
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except :
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pass
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return( rw_vars )
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def SetRWVar( self, ups="", var="", value="" ):
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""" Set a variable to the specified value on selected UPS
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The variable must be a writable value (cf GetRWVars) and you must have the proper
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rights to set it (maybe login/password).
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"""
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self.__srv_handler.write( ("SET VAR %s %s %s\n" % ( ups, var, value )).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if ( result == b"OK\n" ) :
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return( "OK" )
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else :
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raise PyNUTError( result )
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def RunUPSCommand( self, ups="", command="" ) :
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""" Send a command to the specified UPS
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Returns OK on success or raises an error
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"""
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if self.__debug :
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print( "[DEBUG] RunUPSCommand called..." )
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self.__srv_handler.write( ("INSTCMD %s %s\n" % ( ups, command )).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if ( result == b"OK\n" ) :
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return( "OK" )
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else :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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def FSD( self, ups="") :
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""" Send FSD command
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Returns OK on success or raises an error
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NOTE: API changed since NUT 2.8.0 to replace MASTER with PRIMARY
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(and backwards-compatible alias handling)
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"""
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if self.__debug :
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print( "[DEBUG] PRIMARY called..." )
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self.__srv_handler.write( ("PRIMARY %s\n" % ups).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if ( result != b"OK PRIMARY-GRANTED\n" ) :
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if self.__debug :
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print( "[DEBUG] Retrying: MASTER called..." )
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self.__srv_handler.write( ("MASTER %s\n" % ups).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if ( result != b"OK MASTER-GRANTED\n" ) :
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raise PyNUTError( ( "Primary level functions are not available", "" ) )
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if self.__debug :
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print( "[DEBUG] FSD called..." )
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self.__srv_handler.write( ("FSD %s\n" % ups).encode('ascii') )
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result = self.__srv_handler.read_until( b"\n" )
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if ( result == b"OK FSD-SET\n" ) :
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return( "OK" )
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else :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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def help(self) :
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""" Send HELP command
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"""
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if self.__debug :
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print( "[DEBUG] HELP called..." )
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self.__srv_handler.write( b"HELP\n" )
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return self.__srv_handler.read_until( b"\n" )
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def ver(self) :
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""" Send VER command
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"""
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if self.__debug :
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print( "[DEBUG] VER called..." )
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self.__srv_handler.write( b"VER\n" )
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return self.__srv_handler.read_until( b"\n" )
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def ListClients( self, ups = None ) :
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""" Returns the list of connected clients from the NUT server
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The result is a dictionary containing 'key->val' pairs of 'UPSName' and a list of clients
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"""
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if self.__debug :
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print( "[DEBUG] ListClients from server" )
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if ups and (ups not in self.GetUPSList()):
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raise PyNUTError( "%s is not a valid UPS" % ups )
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if ups:
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self.__srv_handler.write( ("LIST CLIENTS %s\n" % ups).encode('ascii') )
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else:
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self.__srv_handler.write( b"LIST CLIENTS\n" )
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result = self.__srv_handler.read_until( b"\n" )
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if result != b"BEGIN LIST CLIENTS\n" :
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raise PyNUTError( result.replace( b"\n", b"" ) )
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result = self.__srv_handler.read_until( b"END LIST CLIENTS\n" )
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ups_list = {}
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for line in result.split( b"\n" ):
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if line[:6] == b"CLIENT" :
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host, ups = line[7:].split(b' ')
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ups.replace(b' ', b'')
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if not ups in ups_list:
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ups_list[ups] = []
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ups_list[ups].append(host)
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return( ups_list )
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