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annotate doc/jp/pubsub.rst @ 3078:95c94d94872d

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author Goffi <goffi@goffi.org>
date Mon, 18 Nov 2019 22:34:13 +0100
parents 72583524cfd3
children cea52c9ddfd9
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1 .. _jp-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 example
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21 -------
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22
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23 Create an item with a custom note XML::
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24
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25 $ echo '<note xmlns="http://example.net/mynotes">this is a note</note>' | jp pubsub set -n "notes"
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26
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27 get
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28 ===
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29
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30 Retrieve items from specified node. Default output is prettified and highlighted XML.
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31
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32 example
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33 -------
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34
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35 Retrieve the last 5 notes from our custom notes node::
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36
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37 $ jp pubsub get -n notes -m 5
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38
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39 delete
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40 ======
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41
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42 Delete an item from a node. If ``-N, --notify`` is specified, subscribers will be notified
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43 of the item retraction.
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44
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45 By default a confirmation is requested before deletion is requested to the PubSub service,
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46 but you can override this behaviour by using ``-f, --force`` option.
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47
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48 example
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49 -------
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50
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51 Delete item with id ``123456`` from a node::
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52
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53 $ jp pubsub delete -n test_node -i 123456
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54
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55 edit
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56 ====
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57
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58 Edit the raw XML of an item payload using your local editor (the one set in ``$EDITOR``).
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59
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60 If you don't change anything or publish an empty blog post, the edition will be cancelled.
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61
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62 :ref:`draft_common` commands can be used.
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63
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64 example
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65 -------
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66
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67 Edit the last note in our custom node::
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68
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69 $ jp pubsub edit -n notes -L
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70
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71 subscribe
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72 =========
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73
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74 Subscribe to a node.
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75
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76 Subscription is used to get notifications from the node in case of new/updated item or
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77 deletion.
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78
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79 example
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80 -------
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81
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82 Subscribe to an information blog::
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83
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84 $ jp pubsub subscribe -n informations -s pubsub.example.net
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85
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86 unsubscribe
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87 ===========
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88
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89 Unsubscribe from a node.
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90
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91 example
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92 -------
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93
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94 Unsubscribe from an information blog::
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95
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96 $ jp pubsub unsubscribe -n informations -s pubsub.example.net
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97
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98 subscriptions
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99 =============
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100
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101 Retrieve subscriptions for all nodes on a service.
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102
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103 ``-n NODE, --node NODE`` can be used to request subscriptions for a specific node (e.g. if
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104 it has subscription with multiple subIDs).
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105
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106 example
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107 -------
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108
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109 Retrieve all subscriptions on a pubsub service::
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110
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111 $ jp pubsub subscriptions -s pubsub@example.net
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112
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113 affiliations
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114 =============
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115
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116 Retrieve affiliations for all nodes at a service.
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117
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118 ``-n NODE, --node NODE`` can be used to request affiliation for a specific node.
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119
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120 examples
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121 --------
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122
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123 Retrieve all affiliations at a pubsub service::
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124
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125 $ jp pubsub affiliations -s pubsub@example.net
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126
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127 Retrieve affiliation for the ``notes`` node::
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128
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129 $ jp pubsub affiliations -s pubsub@example.net -n notes
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130
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131 search
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132 ======
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133
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134 Search items corresponding to one or more filter(s).
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135
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136 ``search`` will check all items (or some of them according to options used) from one or
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137 several nodes (several nodes can be checked if recursion is used, see below). For each
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138 item the given filters will be checked, and all corresponding items will be returned.
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139
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140 This is a resource intensive method (both for server and client), use with caution, and
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141 use MAM to do searching when suitable.
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142
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143 filters
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144 -------
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145
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146 To do a search you one or more filters. Filters are checked in the order in which they are
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147 specified. You can use 4 kinds of filters:
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148
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149 ``-t TEXT, --text TEXT``
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150 do a full-text search. If *TEXT* is appearing anywhere in the item (including in XML
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151 tags or arguments), the item is selected
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152
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153 ``-r EXPRESSION, --regex EXPRESSION``
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154 do a regular expression search. `Python standard re module`_ is used internally, so you
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155 can use its syntax.
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156
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157 ``-x XPATH, --xpath XPATH``
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158 use an `XPath version 1.0`_ expression to filter the query. You can have a look at
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159 `Wikipedia XPath page`_ for a user friendly introduction.
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160
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161 ``-P PYTHON_CODE, --python PYTHON_CODE``
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162 use a Python expression to do a test. The expression must return a boolean (``True`` to
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163 keep item, ``False`` otherwise). From within the Python expression 3 variables are
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164 defined: ``item`` which contain the raw item as a string, and ``item_xml`` which is the
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165 parsed XML as an lxml ``etree.Element`` and ``etree`` which is the ``lxml.etree`` module.
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166
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167 .. _Python standard re module: https://docs.python.org/3.7/library/re.html
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168 .. _XPath version 1.0: https://www.w3.org/TR/1999/REC-xpath-19991116/
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169 .. _Wikipedia XPath page: https://en.wikipedia.org/wiki/XPath
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170
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171 filter modifiers
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172 ----------------
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173
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174 Before each filter you can specify one or more filter modifiers. A modifier will change
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175 filter behaviour, it's a flag which can be used either without argument (then it will
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176 activate the flag), or with an explicit boolean value (i.e. ``true`` or ``false``).
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177
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178 The available filters are:
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179
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180 ``-C [BOOLEAN], --ignore-case [BOOLEAN]``
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181 (don't) ignore case. Filters are normally case sensitive, this modifier change this
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182 behaviour.
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183
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184 ``-I [BOOLEAN], --invert [BOOLEAN]``
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185 (don't) invert effect of following filters. This is applying a logical ``NOT`` to the
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186 filter. This means that instead of keeping item matching the filter, it will keep the
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187 items which are **not** matching the filter.
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188
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189 ``-A [BOOLEAN], --dot-all [BOOLEAN]``
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190 (don't) use `DOTALL`_ option for regex. This filter only makes sense before a
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191 ``--regex`` expression.
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192
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193 ``-k [BOOLEAN], --only-matching [BOOLEAN]``
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194 (don't) keep only the matching part of the item. Normally the whole item is returned,
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195 with this flag, only the part matching the filters are kept.
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196
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197 .. _DOTALL: https://docs.python.org/3.7/library/re.html#re.DOTALL
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198
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199 actions
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200 -------
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201
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202 Once filters are set, you may indicate what do to with the found items. By default they
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203 are printed, but you can also use an other jp command, or even an external tool.
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204
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205 The following actions are available:
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206
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207 ``print`` (default)
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208 pretty print the found items.
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209
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210 ``exec``
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211 use the given jp command on each found item. Everything after the ``exec`` is used to
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212 indicate the command and arguments to use (you must not specify ``jp``, use the command
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213 directly). The service, node and item will be set to match the found item.
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214
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215 ``external``
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216 pipe the raw XML of each item to the given command. Everything after the ``external``
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217 action is used to indicate the command and arguments to use.
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218
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219 recursive search
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220 ----------------
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221
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222 By default, only items in the given node will be filtered, but if you specify a recursion
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223 depth > 0 (using ``-D MAX_DEPTH, --max-depth MAX_DEPTH``), every node linked in item will
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224 be checked too, then node linked in linked item and so on until depth level is reached.
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225
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226 For instance, if you want to find all comments of a blog node containing an http(s) link,
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227 you can do that::
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228
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229 $ jp pubsub search -n urn:xmpp:microblog:0 -s user@example.net -D 1 -r 'https?://'
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230
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231 examples
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232 --------
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233
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234 Finding all items containing the text "something interesting" in personal blog::
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235
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236 $ jp pubsub search -n urn:xmpp:microblog:0 -M -1 -t "something interesting"
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237
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238 Find which blog items in the last 20 have a body with less than 200 characters (note that
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239 body can be either ``<title>`` or ``<content>``, see `XEP-0277`_ for details). Here we use
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240 a python expression on the text of the body to count the number of characters::
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241
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242 $ jp 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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243
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244 Find items published by ``toto@example.net`` among last 30 on a blog node, and use
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245 ``pubsub blog`` command to retrieve id and title. We use ``-N`` to specify the ``pubsub``
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246 namespace which is used in the XPath expression, then we use ``exec`` to run ``blog get -k
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247 title -k id`` on found items::
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248
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249 $ jp 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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250
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251 Find items which have **NOT** a title among last 30 items in our personal blog. As
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252 explained in `XEP-0277`_ Atom's ``<title>`` is always used (even if there is only a body
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253 and no title), so we actually look for items without ``<content>``. We do that with an
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254 XPath looking for this ``atom:content`` element, then we use the ``-I [BOOLEAN], --invert
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255 [BOOLEAN]`` to filter out elements which match.::
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256
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257 $ jp 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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258
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259 Display authors names from last 10 items and their comments, using the ``-k [BOOLEAN],
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260 --only-matching [BOOLEAN]`` modifier to only display the data we need. We use ``-D 1`` to
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261 do a recursive search of level 1, which will also look into comments nodes (using last 10
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262 items there too)::
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263
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264 $ jp 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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265
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266 .. _XEP-0277: https://xmpp.org/extensions/xep-0277.html
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267
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268 transform
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269 =========
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270
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271 Modify items using an external command.
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272
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273 ``transform`` will retrieve requested items, and will send each of them to the standard
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274 input (stdin) of the specified command. The output of the command will be used, it can be
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275 3 things:
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276
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277 - a raw XML of the modified item, in which case the item will be republished
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278 - the string ``SKIP``, in which case the item will be ignored
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279 - the string ``DELETE``, in which case the item will be retracted
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280
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281 By default a dry run is done, which means that no item is modified or deleted. To actually
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282 do the transformation, you have to use ``--apply`` argument.
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283
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284 If you have to modify the ``publisher`` of an item, you need specific privileges. The
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285 ``--admin`` allows you do to that, but it must be supported by your PubSub service
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286 (currently only ``SàT PubSub`` supports this non standard feature).
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287
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288 To modify all items of a node, use the ``-A, --all`` option. This will use `RSM`_
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289 repetitively until all items are treated. Of course that means that your PubSub service
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290 must support RSM. The items being republished, they will reappear on top of your node,
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291 that's why it is recommended to use ``--order-by creation`` option when supported by the
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292 service, to keep consistent order and avoid transforming the same items several times.
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293
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294 If the command you're using exit with a non zero code, the process will stop. Use ``-I,
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295 --ignore_errors`` if you want to continue transformation even if an non zero code is
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296 returned.
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297
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298 .. _RSM: https://xmpp.org/extensions/xep-0059.html
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299
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300 example
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301 -------
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302
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303 Imagine that you want to replace all occurrences of "sàt" by "Salut à Toi" in your personal blog. You first create a Python script like this:
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304
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305 .. sourcecode:: python
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306
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307 #!/usr/bin/env python3
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308
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309 import sys
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310 item_raw = sys.stdin.read()
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311 if not "sàt" in item_raw:
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312 print("SKIP")
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313 else:
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314 print(item_raw.replace("sàt", "Salut à Toi"))
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315
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316 And save it a some location, e.g. ``~/expand_sat.py`` (don't forget to make is executable
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317 with ``chmod +x ~/expand_sat.py``).
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318
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319 To be sure it's safe, you can first do a dry-run and check the result::
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320
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321 $ jp pubsub transform -n urn:xmpp:microblog:0 -A -o creation ~/expand_sat.py
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322
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323 Once you have checked that you have the expected behaviour, you can apply the
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324 transformations::
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325
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326 $ jp pubsub transform -n urn:xmpp:microblog:0 -A -o creation --apply ~/expand_sat.py
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327
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328 And that's it. You can use the same technique for more complex transformations, including
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329 modifying the XML (with Python, you can easily do that with standard
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330 ``xml.etree.ElementTree`` module or with ``lxml.etree``).
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331
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332 uri
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333 ===
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334
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335 Build an XMPP URI linking to a PubSub node or item.
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336
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337 example
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338 -------
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339
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340 Build a link to personal blog::
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341
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342 $ jp pubsub uri -n urn:xmpp:microblog:0
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343
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344 node
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345 ====
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346
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347 Subcommands for node management. Please check :ref:`jp-pubsub_node`.
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348
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349 hook
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350 ====
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351
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352 Subcommands for hooks management. Please check :ref:`jp-pubsub_hook`.