Conditions

Conditions are a mechanism for evaluating whether a set data meets a prescribed set of conditions. It allows the author to convey simple logic by declaring an arbitrary number of attribute-value-operation tuples nested within a hierarchy of logical AND and OR statements.

Conditions

A condition is expressed as a JSON object with the following keys:

Key name	Required	Default	Description
attr	Yes	-	Name of the key within the data being evaluated
value	Yes	-	The reference value to which the given data will be compared
op	No	eq	The logical operation to be performed
negate	No	False	Negate (invert) the result of the condition's evaluation

Available Operations

• eq: Equals
• gt: Greater than
• gte: Greater than or equal to
• lt: Less than
• lte: Less than or equal to
• in: Is present within a list of values
• contains: Contains the specified value

Accessing Nested Keys

To access nested keys, use dots to denote the path to the desired attribute. For example, assume the following data:

{
  "a": {
    "b": {
      "c": 123
    }
  }
}

The following condition will evaluate as true:

{
  "attr": "a.b.c",
  "value": 123
}

Examples

name equals "foo":

{
  "attr": "name",
  "value": "foo"
}

name does not equal "foo"

{
  "attr": "name",
  "value": "foo",
  "negate": true
}

asn is greater than 65000:

{
  "attr": "asn",
  "value": 65000,
  "op": "gt"
}

status is not "enabled" or "disabled":

{
  "attr": "status.value",
  "value": ["enabled", "disabled"],
  "op": "in",
  "negate": true
}

Evaluating static choice fields

Pay close attention when evaluating static choice fields, such as the status field above. These fields typically render as a dictionary specifying both the field's raw value (value) and its human-friendly label (label). be sure to specify on which of these you want to match.

Condition Sets

Multiple conditions can be combined into nested sets using AND or OR logic. This is done by declaring a JSON object with a single key (and or or) containing a list of condition objects and/or child condition sets.

Examples

status is "enabled" and bgp_state is defined or the "exempt" tag is applied.

{
  "or": [
    {
      "and": [
        {
          "attr": "status.value",
          "value": "active"
        },
        {
          "attr": "bgp_state",
          "value": null,
          "negate": true
        }
      ]
    },
    {
      "attr": "tags",
      "value": "exempt",
      "op": "contains"
    }
  ]
}