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doc: check condition on result of child step #546

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doc: check condition on result of child step #546

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25 changes: 24 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,8 @@ A user can be allowed to resolve a task in four ways:
- `.pre_hook.metadata.HTTPStatus`: field `HTTPStatus` from the metadata of the step's pre-hook (see [pre-hooks](#pre-hooks))
- `.function_args.[ARG_NAME]`: argument that needs to be given in the conifguration section to the function (see `functions` below)

`STEP_NAME` can bear the special value `this`, which refers to the current step.

The following templating functions are available:

| Name | Description | Reference |
Expand Down Expand Up @@ -736,7 +738,7 @@ conditions:
- type: skip
foreach: parent
if:
- value: '{{ step.previousCheck.output.result }}'
- value: '{{ .step.previousCheck.output.result }}'
operator: EQ
expected: 'already_done'
then:
Expand All @@ -745,6 +747,27 @@ conditions:

will be run before creating any children, by pruning the parent.

It's also possible to write a `check` condition on the result of a child step with `.step.this`:

```yaml
foreach: '{{.step.aPreviousStep.output.ids | toJson}}'
custom_states: [NOT_FOUND]
action:
type: echo
configuration:
output:
url: '{{ .iterator }}'
conditions:
- type: check
foreach: children # <- can be omitted
if:
- value: '{{ .step.this.metadata.HTTPStatus }}'
operator: EQ
expected: '404'
then:
this: NOT_FOUND
```

#### Resources <a name="resources"></a>

Resources are a way to restrict the concurrency factor of operations, to control the throughput and avoid dangerous behavior (e.g. flooding the targets).
Expand Down