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# Save arbitrary variables so that values can be kept across restarts.
#
# Copyright (C) 2020 Dushyant Ahuja <dusht.ahuja@gmail.com>
# Copyright (C) 2016-2020 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import os, logging, ast, configparser
class SaveVariables:
def __init__(self, config):
self.printer = config.get_printer()
self.filename = os.path.expanduser(config.get('filename'))
self.allVariables = {}
try:
if not os.path.exists(self.filename):
open(self.filename, "w").close()
self.loadVariables()
except self.printer.command_error as e:
raise config.error(str(e))
gcode = self.printer.lookup_object('gcode')
gcode.register_command('SAVE_VARIABLE', self.cmd_SAVE_VARIABLE,
desc=self.cmd_SAVE_VARIABLE_help)
def loadVariables(self):
allvars = {}
varfile = configparser.ConfigParser()
try:
varfile.read(self.filename)
if varfile.has_section('Variables'):
for name, val in varfile.items('Variables'):
allvars[name] = ast.literal_eval(val)
except:
msg = "Unable to parse existing variable file"
logging.exception(msg)
raise self.printer.command_error(msg)
self.allVariables = allvars
cmd_SAVE_VARIABLE_help = "Save arbitrary variables to disk"
def cmd_SAVE_VARIABLE(self, gcmd):
varname = gcmd.get('VARIABLE')
if (varname.lower() != varname):
raise gcmd.error("VARIABLE must not contain upper case")
value = gcmd.get('VALUE')
try:
value = ast.literal_eval(value)
except ValueError as e:
raise gcmd.error("Unable to parse '%s' as a literal" % (value,))
newvars = dict(self.allVariables)
newvars[varname] = value
# Write file
varfile = configparser.ConfigParser()
varfile.add_section('Variables')
for name, val in sorted(newvars.items()):
varfile.set('Variables', name, repr(val))
try:
f = open(self.filename, "w")
varfile.write(f)
f.close()
except:
msg = "Unable to save variable"
logging.exception(msg)
raise gcmd.error(msg)
self.loadVariables()
def get_status(self, eventtime):
return {'variables': self.allVariables}
def load_config(config):
return SaveVariables(config)
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