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rds
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Filename :
parametergroup.py
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# Copyright (c) 2006-2009 Mitch Garnaat http://garnaat.org/ # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, dis- # tribute, sublicense, and/or sell copies of the Software, and to permit # persons to whom the Software is furnished to do so, subject to the fol- # lowing conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS # IN THE SOFTWARE. class ParameterGroup(dict): def __init__(self, connection=None): dict.__init__(self) self.connection = connection self.name = None self.description = None self.engine = None self._current_param = None def __repr__(self): return 'ParameterGroup:%s' % self.name def startElement(self, name, attrs, connection): if name == 'Parameter': if self._current_param: self[self._current_param.name] = self._current_param self._current_param = Parameter(self) return self._current_param def endElement(self, name, value, connection): if name == 'DBParameterGroupName': self.name = value elif name == 'Description': self.description = value elif name == 'Engine': self.engine = value else: setattr(self, name, value) def modifiable(self): mod = [] for key in self: p = self[key] if p.is_modifiable: mod.append(p) return mod def get_params(self): pg = self.connection.get_all_dbparameters(self.name) self.update(pg) def add_param(self, name, value, apply_method): param = Parameter() param.name = name param.value = value param.apply_method = apply_method self.params.append(param) class Parameter(object): """ Represents a RDS Parameter """ ValidTypes = {'integer' : int, 'string' : str, 'boolean' : bool} ValidSources = ['user', 'system', 'engine-default'] ValidApplyTypes = ['static', 'dynamic'] ValidApplyMethods = ['immediate', 'pending-reboot'] def __init__(self, group=None, name=None): self.group = group self.name = name self._value = None self.type = 'string' self.source = None self.is_modifiable = True self.description = None self.apply_method = None self.allowed_values = None def __repr__(self): return 'Parameter:%s' % self.name def startElement(self, name, attrs, connection): pass def endElement(self, name, value, connection): if name == 'ParameterName': self.name = value elif name == 'ParameterValue': self._value = value elif name == 'DataType': if value in self.ValidTypes: self.type = value elif name == 'Source': if value in self.ValidSources: self.source = value elif name == 'IsModifiable': if value.lower() == 'true': self.is_modifiable = True else: self.is_modifiable = False elif name == 'Description': self.description = value elif name == 'ApplyType': if value in self.ValidApplyTypes: self.apply_type = value elif name == 'AllowedValues': self.allowed_values = value else: setattr(self, name, value) def merge(self, d, i): prefix = 'Parameters.member.%d.' % i if self.name: d[prefix+'ParameterName'] = self.name if self._value is not None: d[prefix+'ParameterValue'] = self._value if self.apply_type: d[prefix+'ApplyMethod'] = self.apply_method def _set_string_value(self, value): if not isinstance(value, basestring): raise ValueError('value must be of type str') if self.allowed_values: choices = self.allowed_values.split(',') if value not in choices: raise ValueError('value must be in %s' % self.allowed_values) self._value = value def _set_integer_value(self, value): if isinstance(value, basestring): value = int(value) if isinstance(value, int) or isinstance(value, long): if self.allowed_values: min, max = self.allowed_values.split('-') if value < int(min) or value > int(max): raise ValueError('range is %s' % self.allowed_values) self._value = value else: raise ValueError('value must be integer') def _set_boolean_value(self, value): if isinstance(value, bool): self._value = value elif isinstance(value, basestring): if value.lower() == 'true': self._value = True else: self._value = False else: raise ValueError('value must be boolean') def set_value(self, value): if self.type == 'string': self._set_string_value(value) elif self.type == 'integer': self._set_integer_value(value) elif self.type == 'boolean': self._set_boolean_value(value) else: raise TypeError('unknown type (%s)' % self.type) def get_value(self): if self._value is None: return self._value if self.type == 'string': return self._value elif self.type == 'integer': if not isinstance(self._value, int) and not isinstance(self._value, long): self._set_integer_value(self._value) return self._value elif self.type == 'boolean': if not isinstance(self._value, bool): self._set_boolean_value(self._value) return self._value else: raise TypeError('unknown type (%s)' % self.type) value = property(get_value, set_value, 'The value of the parameter') def apply(self, immediate=False): if immediate: self.apply_method = 'immediate' else: self.apply_method = 'pending-reboot' self.group.connection.modify_parameter_group(self.group.name, [self])