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3 changed files with 30 additions and 27 deletions
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@ -15,7 +15,7 @@ What is a consistency handling system ?
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Tiramisu
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|Tiramisu| is a consistency handling system that was initially designed
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|Tiramisu| is a consistency handling system that has initially been designed
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in the configuration management scope. To put it more simply,
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this library is generally used to handle configuration options.
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@ -44,16 +44,16 @@ The dictionaries
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.. image:: images/schema.png
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The main advantage is that declaring variables and writing consistency is a simple
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as writing YAML. It is not necessary to write :term:`Tiramisu` code.
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The main advantage is that declaring variables and writing consistency is as simple
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as writing YAML. With Rougail it is not necessary to write :term:`Tiramisu` code any more.
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It simplifies a lot of things.
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And rather than writing :term:`Tiramisu` code, we can declare variables and describe the relationships between variables in a declarative mode.
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And rather than writing :term:`Tiramisu` code, we can declare variables and describe the relationships between variables in a declarative mode (that is, in a YAML file).
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Once the dictionaries are loaded by Rougail, we find all the power of the :term:`Tiramisu` configuration management tool.
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The dictionaries YAML format
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---------------------------------
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The YAML dictionaries format
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-----------------------------
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Before getting started with Rougail we need to learn the specifics of the YAML dictionaries file format (as well as some templating concepts).
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@ -78,14 +78,13 @@ The variables
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variable
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Here is a second definition of a :term:`variable`: it is a declaration unit that represents a business domain metaphor,
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the most common example is that a variable represents a configuration option
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the most common example is that a variable that represents a configuration option
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in a application, but a variable represents something more that a configuration option.
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It provides a business domain specific representation unit.
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.. note:: dictionaries can just define a list of variables, but we will see that
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.. note:: Dictionaries can just define a list of variables, but we will see that
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we can specify a lot more. We can define variables **and** their relations,
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and the consistency between them.
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**and** the consistency between them.
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In the next step, we will explain through a tutorial how to construct a list of variables.
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@ -176,7 +175,7 @@ Let's continuing on our "Hello world" theme and add a :term:`family` container.
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description: Somebody to say hello
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default: rougail
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Here, we have a family named `world`.
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Here, we have a family named `world`.
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This family contains a variable named `name`
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Again, let's validate this YAML file against Rougail's API:
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@ -188,5 +187,5 @@ Again, let's validate this YAML file against Rougail's API:
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We then have the output:
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.. code-block:: python
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{'rougail.world.name': 'rougail'}
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@ -3,7 +3,8 @@
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Rougail is a configuration management library that allows you to load variables in a simple and convenient way.
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In the following examples, we will use a specific configuration of Rougail. You will find all the options to :doc:`customize the directories structure used <configuration>`.
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In the following examples, we will use a specific configuration of Rougail.
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You will find all the configuraiton options in :doc:`configuration`.
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To load the configuration you must import the `RougailConfig` class and set the `dictionaries_dir` values:
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@ -31,16 +32,16 @@ Here is a first :file:`dict/00-base.yml` dictionary:
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Then, let's create the :term:`Tiramisu` objects via the following script:
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.. code-block:: python
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.. code-block:: python
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:caption: the `script.py` file content
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from rougail import Rougail, RougailConfig
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RougailConfig['dictionaries_dir'] = ['dict']
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rougail = Rougail()
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config = rougail.get_config()
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print(config.value.get())
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Let's execute `script.py`:
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.. code-block:: bash
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@ -76,9 +77,9 @@ Then let's create an extra :term:`dictionary` :file:`extras/00-base.yml`:
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Then, let's create the :term:`Tiramisu` objects via the following :file:`script.py` script:
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.. code-block:: python
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:caption: the :file:`script.py` file content
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.. code-block:: python
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:caption: the :file:`script.py` file content
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from rougail import Rougail, RougailConfig
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RougailConfig['dictionaries_dir'] = ['dict']
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@ -105,21 +106,21 @@ We create the complementary :term:`dictionary` named :file:`dict/01-function.yml
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version: '1.0'
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my_variable_jinja:
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type: "string"
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default:
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default:
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type: jinja
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jinja: "{{ return_no() }}"
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Then let's define the :func:`return_no` function in :file:`functions.py`:
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.. code-block:: python
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.. code-block:: python
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:caption: the :file:`functions.py` content
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def return_no():
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return 'no'
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Then, let's create the :term:`Tiramisu` objects via the following script:
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.. code-block:: python
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.. code-block:: python
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:caption: the `script.py` file content
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from rougail import Rougail, RougailConfig
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@ -271,9 +271,12 @@ Let's look at what happens if we try to access the `rougail.proxy.manual` variab
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We have an error (with the message defined in the Jinja template):
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.. code-block:: python
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.. code-block:: shell
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tiramisu.error.PropertiesOptionError: cannot access to
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optiondescription "Manual proxy configuration" because
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has property "disabled" (the mode proxy is not manual)
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tiramisu.error.PropertiesOptionError: cannot access to optiondescription "Manual proxy configuration" because has property "disabled" (the mode proxy is not manual)
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Let's configure the proxy in manual mode
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@ -291,7 +294,7 @@ We can see that the returned variables does have the desired values:
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'rougail.proxy.manual.http_proxy.port': '8080',
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'rougail.proxy.manual.use_for_https': True}
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Let's set the `read_only` mode:
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Let's set the `read_only` mode and have a look at the configuration again:
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.. code-block:: python
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@ -307,7 +310,7 @@ Let's set the `read_only` mode:
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In the `read_only` mode, we can see that the HTTPS configuration appears.
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.. note:: We can see that `rougail.proxy.manual.http_proxy` values have been copied
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in `rougail.proxy.manual.ssl_proxy` too...
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in `rougail.proxy.manual.ssl_proxy` too.
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Changing values programmatically
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--------------------------------------
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