62 lines
1.9 KiB
Plaintext
62 lines
1.9 KiB
Plaintext
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[[transform]]
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== Transforms
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A _Transform_ processes and changes the payload in the watch execution context
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to prepare it for the watch actions. {watcher} supports three types of
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transforms: <<transform-search, `search`>>,
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<<transform-script, `script`>> and <<transform-chain, `chain`>>.
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NOTE: Transforms are optional. When none are defined, the actions have access to
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the payload as loaded by the watch input.
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You can define transforms in two places:
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* As a top level construct in the watch definition. In this case, the payload is
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transformed before any of the watch actions are executed.
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* As part of the definition of an action. In this case, the payload is
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transformed before that action is executed. The transformation is only applied
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to the payload for that specific action.
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If all actions require the same view of the payload, define a transform as part
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of the watch definition. If each action requires a different view of the payload,
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define different transforms as part of the action definitions so each action has
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the payload prepared by its own dedicated transform.
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The following example defines two transforms, one at the watch level and one as
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part of the definition of the `my_webhook` action.
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[source,js]
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--------------------------------------------------
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{
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"trigger" : { ...}
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"input" : { ... },
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"condition" : { ... },
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"transform" : { <1>
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"search" : {
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"body" : { "query" : { "match_all" : {} } }
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}
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},
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"actions" : {
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"my_webhook": {
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"transform" : { <2>
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"script" : "return ctx.payload.hits"
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},
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"webhook" : {
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"host" : "host.domain",
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"port" : 8089,
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"path" : "/notify/{{ctx.watch_id}}"
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}
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}
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]
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}
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--------------------------------------------------
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<1> A watch level `transform`
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<2> An action level `transform`
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include::transform/search.asciidoc[]
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include::transform/script.asciidoc[]
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include::transform/chain.asciidoc[]
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