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annotate doc/libervia-cli/pubsub.rst @ 3713:f97be63871e4 v0.8.0

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v0.8.0 release
author Goffi <goffi@goffi.org>
date Tue, 30 Nov 2021 23:31:07 +0100
parents 7acf19bdca2f
children 7bc443253b7c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 .. _libervia-cli_pubsub:
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2
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3 =========================
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4 pubsub: PubSub management
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5 =========================
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6
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7 PubSub commands are low level command to handle a PubSub Service.
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8 They are using the generic pubsub arguments
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9
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10 For most of those commands, :ref:`pubsub_common` commands are used to specify the
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11 destination item.
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12
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13 set
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14 ===
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15
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16 Publish a pubsub item.
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17
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18 ``stdin`` is used to get the raw XML of the payload of the item to publish.
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19
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20 ``-f KEY VALUE, --field KEY VALUE`` can be used to specify publish options, i.e. option
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21 which must be set if the node already exists, or used if the node is to be created, see
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22 `XEP-0060 §7.1.5`_ for details.
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24 In the same way as for :ref:`libervia-cli_pubsub_node_create`, ``-F, --full-prefix`` can be used if
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25 you need to specify the full option name.
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26
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27 .. _XEP-0060 §7.1.5: https://xmpp.org/extensions/xep-0060.html#publisher-publish-options
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28
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29 example
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30 -------
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31
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32 Create an item with a custom note XML::
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33
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34 $ echo '<note xmlns="http://example.net/mynotes">this is a note</note>' | li pubsub set -n "notes"
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35
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36 get
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37 ===
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38
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39 Retrieve items from specified node. Default output is prettified and highlighted XML.
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40
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41 example
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42 -------
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43
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44 Retrieve the last 5 notes from our custom notes node::
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45
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46 $ li pubsub get -n notes -m 5
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47
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48 .. _li_pubsub_delete:
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49
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50 delete
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51 ======
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52
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53 Delete an item from a node. If ``-N, --notify`` is specified, subscribers will be notified
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54 of the item retraction.
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55
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56 By default a confirmation is requested before deletion is requested to the PubSub service,
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57 but you can override this behaviour by using ``-f, --force`` option.
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58
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59 example
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60 -------
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61
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62 Delete item with id ``123456`` from a node::
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63
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64 $ li pubsub delete -n test_node -i 123456
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65
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66 edit
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67 ====
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68
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69 Edit the raw XML of an item payload using your local editor (the one set in ``$EDITOR``).
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70
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71 If you don't change anything or publish an empty blog post, the edition will be cancelled.
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72
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73 :ref:`draft_common` commands can be used.
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75 example
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76 -------
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77
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78 Edit the last note in our custom node::
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79
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80 $ li pubsub edit -n notes -L
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82 .. _li-pubsub_rename:
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84 rename
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85 ======
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86
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87 Move a item to a new ID. As there is currently no "rename" or "move" operation in XMPP
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88 PubSub, this is done by republishing the item with the new ID, then deleting the old item
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89 if the publication succeed.
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91 This is notably useful when user friendly URL based on ID are used, and one need to fix a
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92 typo or something else.
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94 example
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95 -------
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97 Rename a PubSub item with ID ``123`` to ``456``::
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98
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99 $ li pubsub rename -n some_node -i 123 456
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100
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101 subscribe
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102 =========
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103
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104 Subscribe to a node.
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106 Subscription is used to get notifications from the node in case of new/updated item or
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107 deletion.
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108
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109 example
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110 -------
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112 Subscribe to an information blog::
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113
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114 $ li pubsub subscribe -n informations -s pubsub.example.net
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115
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116 unsubscribe
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117 ===========
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118
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119 Unsubscribe from a node.
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121 example
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122 -------
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123
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124 Unsubscribe from an information blog::
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125
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126 $ li pubsub unsubscribe -n informations -s pubsub.example.net
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127
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128 subscriptions
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129 =============
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130
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131 Retrieve subscriptions for all nodes on a service.
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132
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133 ``-n NODE, --node NODE`` can be used to request subscriptions for a specific node (e.g. if
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134 it has subscription with multiple subIDs).
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136 example
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137 -------
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139 Retrieve all subscriptions on a pubsub service::
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140
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141 $ li pubsub subscriptions -s pubsub@example.net
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142
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143 affiliations
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144 =============
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145
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146 Retrieve affiliations for all nodes at a service.
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147
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148 ``-n NODE, --node NODE`` can be used to request affiliation for a specific node.
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149
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150 examples
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151 --------
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152
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153 Retrieve all affiliations at a pubsub service::
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154
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155 $ li pubsub affiliations -s pubsub@example.net
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156
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157 Retrieve affiliation for the ``notes`` node::
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158
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159 $ li pubsub affiliations -s pubsub@example.net -n notes
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160
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161 search
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162 ======
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163
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164 Search items corresponding to one or more filter(s).
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165
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166 ``search`` will check all items (or some of them according to options used) from one or
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167 several nodes (several nodes can be checked if recursion is used, see below). For each
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168 item the given filters will be checked, and all corresponding items will be returned.
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169
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170 This is a resource intensive method (both for server and client), use with caution, and
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171 use MAM to do searching when suitable.
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172
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173 filters
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174 -------
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175
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176 To do a search you one or more filters. Filters are checked in the order in which they are
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177 specified. You can use 4 kinds of filters:
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178
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179 ``-t TEXT, --text TEXT``
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180 do a full-text search. If *TEXT* is appearing anywhere in the item (including in XML
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181 tags or arguments), the item is selected
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182
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183 ``-r EXPRESSION, --regex EXPRESSION``
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184 do a regular expression search. `Python standard re module`_ is used internally, so you
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185 can use its syntax.
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186
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187 ``-x XPATH, --xpath XPATH``
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188 use an `XPath version 1.0`_ expression to filter the query. You can have a look at
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189 `Wikipedia XPath page`_ for a user friendly introduction.
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190
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191 ``-P PYTHON_CODE, --python PYTHON_CODE``
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192 use a Python expression to do a test. The expression must return a boolean (``True`` to
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193 keep item, ``False`` otherwise). From within the Python expression 3 variables are
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194 defined: ``item`` which contain the raw item as a string, and ``item_xml`` which is the
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195 parsed XML as an lxml ``etree.Element`` and ``etree`` which is the ``lxml.etree`` module.
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196
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197 .. _Python standard re module: https://docs.python.org/3.7/library/re.html
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198 .. _XPath version 1.0: https://www.w3.org/TR/1999/REC-xpath-19991116/
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199 .. _Wikipedia XPath page: https://en.wikipedia.org/wiki/XPath
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200
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201 filter modifiers
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202 ----------------
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203
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204 Before each filter you can specify one or more filter modifiers. A modifier will change
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205 filter behaviour, it's a flag which can be used either without argument (then it will
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206 activate the flag), or with an explicit boolean value (i.e. ``true`` or ``false``).
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207
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208 The available filters are:
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209
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210 ``-C [BOOLEAN], --ignore-case [BOOLEAN]``
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211 (don't) ignore case. Filters are normally case sensitive, this modifier change this
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212 behaviour.
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213
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214 ``-I [BOOLEAN], --invert [BOOLEAN]``
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215 (don't) invert effect of following filters. This is applying a logical ``NOT`` to the
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216 filter. This means that instead of keeping item matching the filter, it will keep the
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217 items which are **not** matching the filter.
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218
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219 ``-A [BOOLEAN], --dot-all [BOOLEAN]``
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220 (don't) use `DOTALL`_ option for regex. This filter only makes sense before a
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221 ``--regex`` expression.
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222
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223 ``-k [BOOLEAN], --only-matching [BOOLEAN]``
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224 (don't) keep only the matching part of the item. Normally the whole item is returned,
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225 with this flag, only the part matching the filters are kept.
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226
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227 .. _DOTALL: https://docs.python.org/3.7/library/re.html#re.DOTALL
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228
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229 actions
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230 -------
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231
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232 Once filters are set, you may indicate what do to with the found items. By default they
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233 are printed, but you can also use an other li command, or even an external tool.
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234
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235 The following actions are available:
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236
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237 ``print`` (default)
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238 pretty print the found items.
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239
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240 ``exec``
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241 use the given li command on each found item. Everything after the ``exec`` is used to
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242 indicate the command and arguments to use (you must not specify ``li``, use the command
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243 directly). The service, node and item will be set to match the found item.
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244
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245 ``external``
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246 pipe the raw XML of each item to the given command. Everything after the ``external``
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247 action is used to indicate the command and arguments to use.
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248
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249 recursive search
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250 ----------------
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251
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252 By default, only items in the given node will be filtered, but if you specify a recursion
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253 depth > 0 (using ``-D MAX_DEPTH, --max-depth MAX_DEPTH``), every node linked in item will
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254 be checked too, then node linked in linked item and so on until depth level is reached.
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255
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256 For instance, if you want to find all comments of a blog node containing an http(s) link,
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257 you can do that::
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258
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259 $ li pubsub search -n urn:xmpp:microblog:0 -s user@example.net -D 1 -r 'https?://'
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260
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261 examples
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262 --------
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263
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264 Finding all items containing the text "something interesting" in personal blog::
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265
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266 $ li pubsub search -n urn:xmpp:microblog:0 -M -1 -t "something interesting"
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267
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268 Find which blog items in the last 20 have a body with less than 200 characters (note that
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269 body can be either ``<title>`` or ``<content>``, see `XEP-0277`_ for details). Here we use
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270 a python expression on the text of the body to count the number of characters::
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271
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272 $ li pubsub search -n urn:xmpp:microblog:0 -M 20 --python "len((item_xml.find('.//{http://www.w3.org/2005/Atom}content[@type=\"text\"]') or item_xml.find('.//{http://www.w3.org/2005/Atom}title[@type=\"text\"]')).text) < 200"
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273
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274 Find items published by ``toto@example.net`` among last 30 on a blog node, and use
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275 ``pubsub blog`` command to retrieve id and title. We use ``-N`` to specify the ``pubsub``
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276 namespace which is used in the XPath expression, then we use ``exec`` to run ``blog get -k
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277 title -k id`` on found items::
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278
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279 $ li pubsub search -n some_blog_node -s pubsub.example.net -M 30 -N pubsub http://jabber.org/protocol/pubsub -x '/pubsub:item[starts-with(@publisher, "toto@example.net")]' exec blog get -k title -k id
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280
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281 Find items which have **NOT** a title among last 30 items in our personal blog. As
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282 explained in `XEP-0277`_ Atom's ``<title>`` is always used (even if there is only a body
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283 and no title), so we actually look for items without ``<content>``. We do that with an
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284 XPath looking for this ``atom:content`` element, then we use the ``-I [BOOLEAN], --invert
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285 [BOOLEAN]`` to filter out elements which match.::
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286
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287 $ li pubsub search -n urn:xmpp:microblog:0 -M 30 -I -x //atom:content -N atom http://www.w3.org/2005/Atom
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288
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289 Display authors names from last 10 items and their comments, using the ``-k [BOOLEAN],
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290 --only-matching [BOOLEAN]`` modifier to only display the data we need. We use ``-D 1`` to
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291 do a recursive search of level 1, which will also look into comments nodes (using last 10
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292 items there too)::
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293
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294 $ li pubsub search -n urn:xmpp:microblog:0 -M 10 --only-matching -x //atom:author/atom:name -N atom http://www.w3.org/2005/Atom -D 1
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295
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296 .. _XEP-0277: https://xmpp.org/extensions/xep-0277.html
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297
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298 transform
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299 =========
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300
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301 Modify items using an external command.
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302
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303 ``transform`` will retrieve requested items, and will send each of them to the standard
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304 input (stdin) of the specified command. The output of the command will be used, it can be
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305 3 things:
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306
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307 - a raw XML of the modified item, in which case the item will be republished
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308 - the string ``SKIP``, in which case the item will be ignored
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309 - the string ``DELETE``, in which case the item will be retracted
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310
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311 By default a dry run is done, which means that no item is modified or deleted. To actually
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312 do the transformation, you have to use ``--apply`` argument.
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313
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314 If you have to modify the ``publisher`` of an item, you need specific privileges. The
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315 ``--admin`` allows you do to that, but it must be supported by your PubSub service
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316 (currently only ``Libervia PubSub`` supports this non standard feature).
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317
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318 To modify all items of a node, use the ``-A, --all`` option. This will use `RSM`_
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319 repetitively until all items are treated. Of course that means that your PubSub service
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320 must support RSM. The items being republished, they will reappear on top of your node,
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321 that's why it is recommended to use ``--order-by creation`` option when supported by the
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322 service, to keep consistent order and avoid transforming the same items several times.
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323
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324 If the command you're using exit with a non zero code, the process will stop. Use ``-I,
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325 --ignore_errors`` if you want to continue transformation even if an non zero code is
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326 returned.
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327
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328 .. _RSM: https://xmpp.org/extensions/xep-0059.html
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329
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330 example
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331 -------
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332
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333 Imagine that you want to replace all occurrences of "sàt" by "Libervia" in your personal blog. You first create a Python script like this:
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334
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335 .. sourcecode:: python
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336
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337 #!/usr/bin/env python3
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338
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339 import sys
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340 item_raw = sys.stdin.read()
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341 if not "sàt" in item_raw:
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342 print("SKIP")
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343 else:
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344 print(item_raw.replace("sàt", "Libervia"))
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345
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346 And save it a some location, e.g. ``~/expand_sat.py`` (don't forget to make it executable
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347 with ``chmod +x ~/expand_sat.py``).
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348
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349 To be sure it's safe, you can first do a dry-run and check the result::
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350
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351 $ li pubsub transform -n urn:xmpp:microblog:0 -A -o creation ~/expand_sat.py
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352
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353 Once you have checked that you have the expected behaviour, you can apply the
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354 transformations::
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355
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356 $ li pubsub transform -n urn:xmpp:microblog:0 -A -o creation --apply ~/expand_sat.py
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357
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358 And that's it. You can use the same technique for more complex transformations, including
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359 modifying the XML (with Python, you can easily do that with standard
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360 ``xml.etree.ElementTree`` module or with ``lxml.etree``).
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361
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362 uri
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363 ===
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364
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365 Build an XMPP URI linking to a PubSub node or item.
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366
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367 example
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368 -------
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369
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370 Build a link to personal blog::
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371
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372 $ li pubsub uri -n urn:xmpp:microblog:0
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373
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374 node
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375 ====
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376
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377 Subcommands for node management. Please check :ref:`libervia-cli_pubsub_node`.
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378
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379 hook
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380 ====
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381
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382 Subcommands for hooks management. Please check :ref:`libervia-cli_pubsub_hook`.