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@ -6,15 +6,17 @@ Options handling basics
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Tiramisu is made of almost three main objects :
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- :class:`tiramisu.config.Config` which is the whole configuration entry point
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- :class:`tiramisu.option.Option` stands for the option types
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- :class:`tiramisu.option.OptionDescription` is the shema, the option's structure
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- :class:`tiramisu.config.Config` which is the whole configuration entry point
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.. image:: config.png
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Accessing the `Option`'s
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-------------------------
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The :class:`~tiramisu.config.Config` object attribute access notation stands for
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the value of the configuration's :class:`~tiramisu.option.Option`. That is, the
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the value of the configuration's :class:`~tiramisu.option.Option`.
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:class:`~tiramisu.config.Config`'s object attribute is the name of the option,
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and the value is the value accessed by the `__getattr__` attribute access
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mechanism.
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@ -49,7 +51,7 @@ are organized into a tree into nested
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as does every option group. The parts of the full name of the option are
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separated by dots: e.g. ``cfg.optgroup.optname``.
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Let's make the protocol of accessing a config's attribute explicit
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Let's make the protocol of accessing a `Config`'s attribute explicit
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(because explicit is better than implicit):
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1. If the option has not been declared, an `AttributeError` is raised,
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@ -67,11 +69,11 @@ But there are special exceptions. We will see later on that an option can be a
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:term:`mandatory option`. A mandatory option is an option that must have a value
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defined.
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Setting the values of the options
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----------------------------------------
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Setting the value of an option
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------------------------------
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An important part of the setting of the configuration consists of setting the
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values of the configuration options. There are different ways of setting values,
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An important part of the setting's configuration consists of setting the
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value's option. There are different ways of setting values,
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the first one is of course the `__setattr__` method
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::
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@ -103,10 +105,10 @@ Let's perform some common manipulation on some options
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>>> from tiramisu.config import Config
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>>> from tiramisu.option import UnicodeOption, OptionDescription
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>>>
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>>> #
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>>> var1 = UnicodeOption('var1', 'first variable')
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>>> var2 = UnicodeOption('var2', '', u'value')
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>>>
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>>> #
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>>> od1 = OptionDescription('od1', 'first OD', [var1, var2])
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>>> rootod = OptionDescription('rootod', '', [od1])
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@ -127,10 +129,11 @@ None
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>>> print c.od1.var2
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value
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let's modify a value (careful to the value's type...)
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let's modify a value (be careful to the value's type...)
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>>> c.od1.var1 = 'value'
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Traceback (most recent call last): ValueError: invalid value value for option var1
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Traceback (most recent call last):
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ValueError: invalid value value for option var1
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>>> c.od1.var1 = u'value'
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>>> print c.od1.var1
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value
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@ -153,7 +156,8 @@ On the other side, in the `read_only` mode, it is not possible to modify the val
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>>> c.read_only()
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>>> c.od1.var2 = u'value2'
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Traceback (most recent call last):
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tiramisu.error.PropertiesOptionError: cannot change the value to var2 for option ['frozen'] this option is frozen
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tiramisu.error.PropertiesOptionError: cannot change the value for option var2 this option is frozen
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let's retrieve the option `var1` description
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@ -184,7 +188,7 @@ That's why a tree of options can easily be searched. First, let's build such a t
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>>> c = Config(rootod)
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>>> c.read_write()
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Second, let's find an option by his name::
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Second, let's find an option by it's name::
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>>> print c.find(byname='var1')
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[<tiramisu.option.UnicodeOption object at 0x7ff1bf7d6ef0>,
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@ -232,7 +236,7 @@ If the organisation in a tree is not important,
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{'var5': None, 'var4': None, 'var6': None, 'var1': u'value', 'var3': None,
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'var2': None}
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.. note:: carefull with this `flatten` parameter, here we have just lost
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.. note:: be carefull with this `flatten` parameter, here we have just lost
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two options named `var1`
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One can export only interesting parts of a tree of options into a dict, for
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@ -249,7 +253,7 @@ and of course, :meth:`~config.SubConfig.make_dict()` can be called in a subtree:
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>>> print c.od1.make_dict(withoption='var1')
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{'var1': None, 'var3': None, 'var2': None}
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the owners
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The owners
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~~~~~~~~~~~
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.. glossary::
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@ -267,24 +271,36 @@ the owners
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Then let's retrieve the owner associated to an option::
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>>> print c.getowner('var1')
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>>> print c.getowner(var1)
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default
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>>> c.od1.var1 = u'non'
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>>> print c.getowner('var1')
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>>> c.od1.var1 = u'no'
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>>> print c.getowner(var1)
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user
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>>> del(c.var1)
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>>> print c.getowner('var1')
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>>> print c.getowner(var1)
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default
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the properties
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~~~~~~~~~~~~~~~~
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You can create your own owner, for example to distinguish modification made by
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one user to an other one's.
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>>> from tiramisu.setting import owners
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>>> owners.addowner('toto')
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>>> c.cfgimpl_get_settings().setowner(owners.toto)
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>>> print c.getowner(var1)
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default
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>>> c.od1.var1 = u'no'
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>>> print c.getowner(var1)
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toto
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The properties
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~~~~~~~~~~~~~~
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A property is an information on an option's state.
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Let's create options with properties::
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>>> var1 = UnicodeOption('var1', '', u'value', properties=('hidden',))
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>>> var2 = UnicodeOption('var2', '', properties=('mandatory',))
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>>> var3 = UnicodeOption('var3', '', u'value', properties=('frozen', 'inconnu'))
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>>> var3 = UnicodeOption('var3', '', u'value', properties=('frozen', 'unknown'))
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>>> var4 = UnicodeOption('var4', '', u'value')
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>>> od1 = OptionDescription('od1', '', [var1, var2, var3])
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>>> od2 = OptionDescription('od2', '', [var4], properties=('hidden',))
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@ -338,17 +354,17 @@ Let's try to modify a frozen option::
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Tiramisu allows us to use user defined properties. Let's define and use one in
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read/write or read only mode::
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>>> c.cfgimpl_get_settings().append('inconnu')
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>>> c.cfgimpl_get_settings().append('unknown')
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>>> print c.od1.var3
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Traceback (most recent call last):
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tiramisu.error.PropertiesOptionError: trying to access to an option named:
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var3 with properties ['inconnu']
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>>> c.cfgimpl_get_settings().remove('inconnu')
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var3 with properties ['unknown']
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>>> c.cfgimpl_get_settings().remove('unknown')
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>>> print c.od1.var3
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value
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Properties can also be defined on an option group, (that is, on an
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:term:`option description`), let's hide a group and try to access to it::
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Properties can also be defined on an option group (that is, on an
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:term:`option description`) let's hide a group and try to access to it::
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>>> c.read_write()
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>>> print c.od2.var4
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@ -33,8 +33,8 @@ controlling options explanations
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getting-started
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config
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storage
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option
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storage
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status
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consistency
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error
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@ -9,7 +9,7 @@ Description of Options
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----------------------
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All the constructors take a ``name`` and a ``doc`` argument as first
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arguments to give the option or option group a name and to document it.
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arguments to give to the option or option description a name and a description document.
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Most constructors take a ``default`` argument that specifies the default
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value of the option. If this argument is not supplied the default value
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is assumed to be ``None``.
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@ -17,7 +17,7 @@ is assumed to be ``None``.
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The `Option` base class
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-------------------------
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It's the abstract base class for almost all options (except the symblink).
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It's the abstract base class for almost all options (except the symlink).
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.. _optioninit:
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@ -28,22 +28,41 @@ It's the abstract base class for almost all options (except the symblink).
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All option types
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------------------
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BoolOption
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~~~~~~~~~~
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.. autoclass:: BoolOption
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:private-members:
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IntOption
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~~~~~~~~~
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.. autoclass:: IntOption
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:private-members:
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FloatOption
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~~~~~~~~~~~
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.. autoclass:: FloatOption
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:private-members:
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StrOption
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~~~~~~~~~
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.. autoclass:: StrOption
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:private-members:
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UnicodeOption
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~~~~~~~~~~~~~
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.. autoclass:: UnicodeOption
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:private-members:
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SymLinkOption
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~~~~~~~~~~~~~
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.. autoclass:: SymLinkOption
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.. automethod:: __init__
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:private-members:
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``SymLinkOption`` redirects to another configuration option in the
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@ -52,19 +71,41 @@ configuration, that is :
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- retrieves the value of the target,
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- can set the value of the target too
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IPOption
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~~~~~~~~
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.. autoclass:: IPOption
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:private-members:
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PortOption
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~~~~~~~~~~
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.. autoclass:: PortOption
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:private-members:
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NetmaskOption
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~~~~~~~~~~~~~
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.. autoclass:: NetmaskOption
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:private-members:
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NetworkOption
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~~~~~~~~~~~~~
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.. autoclass:: NetworkOption
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:private-members:
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DomainnameOption
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~~~~~~~~~~~~~~~~
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.. autoclass:: DomainnameOption
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:private-members:
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ChoiceOption
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~~~~~~~~~~~~
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.. autoclass:: ChoiceOption
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.. automethod:: __init__
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:private-members:
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.. _optdescr:
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@ -1,18 +1,12 @@
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Storage
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=======
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Config's informations are, by default, volatiles. This means, all values and
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settings changes will be lost.
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The storage is the system Tiramisu uses to communicate with various DB.
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You can specified a persistent storage.
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.. image:: storage.png
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.. automodule:: tiramisu.storage
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.. automethod:: tiramisu.storage.set_storage
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.. image:: storage.png
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Dictionary
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~~~~~~~~~~
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@ -49,4 +43,10 @@ Example
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>>> c2 = Config(o, persistent=True, session_id='xxxx')
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>>> c2.str
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'yes'
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>>> del(c2)
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>>> list_sessions()
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['xxxx']
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>>> delete_session('xxxx')
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>>> c3 = Config(o, persistent=True, session_id='xxxx')
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>>> c3.str
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@ -319,7 +319,7 @@ class Option(BaseOption):
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"""
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Abstract base class for configuration option's.
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Reminder: an Option object is **not** a container for the value
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Reminder: an Option object is **not** a container for the value.
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"""
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__slots__ = ('_multi', '_validator', '_default_multi', '_default',
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'_callback', '_multitype', '_master_slaves', '__weakref__')
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@ -342,9 +342,10 @@ class Option(BaseOption):
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:param callback: the name of a function. If set, the function's output
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is responsible of the option's value
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:param callback_params: the callback's parameter
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:param validator: the name of a function wich stands for a custom
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:param validator: the name of a function which stands for a custom
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validation of the value
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:param validator_args: the validator's parameters
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:param properties: tuple of default properties
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"""
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super(Option, self).__init__(name, doc, requires, properties)
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@ -19,7 +19,13 @@
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# the whole pypy projet is under MIT licence
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# ____________________________________________________________
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"""Storage is basic components used to set Config informations in DB.
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"""Config's informations are, by default, volatiles. This means, all values and
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settings changes will be lost.
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The storage is the system Tiramisu uses to communicate with various DB.
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You can specified a persistent storage.
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Storage is basic components used to set Config informations in DB.
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The primary "entry point" class is the StorageType and it's public
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configurator ``set_storage()``.
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"""
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