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doc: documentation to create a Libervia app, first draft
author Goffi <goffi@goffi.org>
date Fri, 31 May 2024 11:08:18 +0200
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1 .. _libervia-app-config:
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2
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3 =================================
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4 Libervia App Configuration (YAML)
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5 =================================
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6
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7 The Libervia application uses a YAML configuration file to define various aspects of the
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8 application's behavior, environment, and settings.
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9
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10 The file will be parsed by `PyYAML`_ which is a full-featured YAML implementation. Check
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11 its documentation for details.
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12
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13 Below is the documentation explaining the structure and functionality of each field in the
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14 YAML file.
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15
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16 =================
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17 Root-Level Fields
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18 =================
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19
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20 - ``type``: Specifies the type of the application. See :ref:`libervia-app_type`.
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21
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22 - ``prepare``: Information required to prepare the environment. See :ref:`libervia-app_prepare`.
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23
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24 - ``files``: Specifies files to be created with defined content. See :ref:`libervia-app_files`.
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25
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26 - ``override``: Allows to override or add to default configurations. See :ref:`libervia-app_override`.
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27
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28 - ``expose``: Specifies configurations exposed to frontends or administrators. See :ref:`libervia-app_expose`.
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29
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30 ==================
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31 Detailed Sections
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32 ===================
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33
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34 .. _libervia-app_type:
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35
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36 type
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37 ^^^^
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38
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39 Currently, the only supported type is ``docker-compose``.
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40
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41 .. _libervia-app_prepare:
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42
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43 prepare
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44 ^^^^^^^
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45
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46 The ``prepare`` section specifies things like git repositories to be cloned before running the application.
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47
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48 Example
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49 -------
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50 Cloning the repository at `https://example.org/some/repository.git` to prepare the app:
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51
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52 .. code-block:: yaml
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53
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54 prepare:
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55 git: https://example.org/some/repository.git
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56
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57 .. _libervia-app_files:
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58
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59 files
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60 ^^^^^
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61
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62 The ``files`` section specifies additional files to be created for the application.
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63
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64 The YAML key is the name of the file to be created, and the content specified will
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65 populate that file.
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66
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67 Example
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68 -------
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69 Creating a file named `settings-override.py` with the content `USE_X_FORWARDED_HOST = True`:
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70
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71 .. code-block:: yaml
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72
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73 files:
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74 settings-override.py:
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75 content: |
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76 USE_X_FORWARDED_HOST = True
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77
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78 .. _libervia-app_override:
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79
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80 override
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81 ^^^^^^^^
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82
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83 The ``override`` section allows for the specification or override of configurations. This
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84 creates a ``docker-compose.override.yml`` file that will be merged with the default
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85 ``docker-compose.yml``. For more information, see `Docker documentation
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86 <https://docs.docker.com/compose/reference/#specifying-multiple-compose-files>`_.
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87
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88 Example
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89 -------
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90 Overriding the `ports` for the `example_app` service to expose port `8080`:
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91
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92 .. code-block:: yaml
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93
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94 override:
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95 services:
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96 example_app:
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97 ports:
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98 - "8080"
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99
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100 .. _libervia-app_expose:
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101
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102 Exposing Data
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103 ^^^^^^^^^^^^^
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104
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105 The `expose` section specifies the configurations that are exposed to users or frontends.
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106 See :ref:`libervia-app_param` for a reference of some exposed data. Ports and generated
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107 passwords are exposed in dicts, respectively at the ``ports`` and ``passwords`` key.
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108
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109 .. _libervia-app_yaml-tags:
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110
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111 YAML Tags
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112 ^^^^^^^^^
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113
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114 The following YAML tags can be used in the Libervia App configuration file:
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115
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116 .. _libervia-app_conf:
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117
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118 !libervia_conf
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119 ++++++++++++++
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120
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121 Get a value from Libervia configuration. A list is expected with either:
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122
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123 - `name` of a config parameter
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124 - `section` and `name` of a config parameter
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125 - `section`, `name`, and `default` value of a config parameter
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126 - `section`, `name`, `default` value, and `filter` (either `first` or `not`)
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127
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128 Filter options:
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129
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130 - `first`: get the first item of the value
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131 - `not`: get the opposite value (to be used with booleans)
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132
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133 Example
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134 -------
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135 Getting a value from Libervia configuration:
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136
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137 .. code-block:: yaml
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138
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139 !libervia_conf [section, name, default]
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140
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141 .. _libervia-app_generate_pwd:
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142
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143 !libervia_generate_pwd
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144 +++++++++++++++++++++
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145
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146 Generate a password and store it in persistent data. If the password has already been generated previously, it is reused.
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147
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148 Arguments:
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149
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150 - `name` (str) **required**: Name of the password. Will be used to store it so it kept
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151 between restarts.
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152 - `size` (int): Size of the password to generate. Default to 30
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153
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154 Example
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155 -------
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156 Generating a password named ``some_password`` with a size of 32 characters:
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157
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158 .. code-block:: yaml
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159
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160 !libervia_generate_pwd {name: some_password, size: 32}
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161
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162 .. _libervia-app_param:
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163
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164 !libervia_param
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165 ++++++++++++++
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166
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167 Get a parameter specified when starting the application. The value can be either the name
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168 of the parameter to get, or a list as `[name, default_value]`.
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169
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170
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171
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172 Available parameters:
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173
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174 url_prefix
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175 The internal URL where the app will be served.
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176 web_label
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177 Label which will be used in Web frontend.
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178 web_url_path
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179 Public facing URL path which will be used in the web frontend to access the app.
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180 web_external
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181 If True, the web frontend will open the app in a separated page instead of embedding
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182 it.
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183 front_url
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184 Whole URL to access the app. It is specified when the app has its own domain or
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185 subdomain.
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186
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187 Example
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188 -------
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189 Getting a parameter:
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190
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191 .. code-block:: yaml
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192
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193 !libervia_param [url_prefix, /some_app]
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194
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195 .. _PyYAML: https://pyyaml.org/
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196