EventBridge matcher support

EventBridge had release improved set of matchers for it’s Pattern by end of 2019. This had been described in detail in Blog post and Documentation page

The current implementation of EventPattern needs to be changed to address it: https://github.com/aws/aws-cdk/blob/master/packages/@aws-cdk/aws-events/lib/event-pattern.ts#L30

The operators to be supported:

• Prefix
• AnythingBut
• Numeric
• Exists

Use Case

The use case is to allow customer use the full capabilities of EventBridge pattern matching through CDK.

Proposed Solution

This is to be discuss, I would like to expand the existing way using the union like structure that would convert the existing definition from i.e.:

readonly source?: string[]

into:

readonly source?: string[] | Prefix | AnythingBut | Exists | Numeric 

Providing the this can be supported by CDK transcompilation.

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

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This is a 🚀 Feature Request

[ryanvade]

Apparently this works for now:

source: [ { prefix: "your.prefix.here"} ] as any[]

[davecap]

Is there a known workaround for CDK Python?

UPDATE: Here is a workaround for Python

rule = events.Rule(
    ...
    # set dummy pattern
    event_pattern=events.EventPattern(account=[self.account])
)
# Use "escape hatch" to set the pattern
rule.node.default_child.event_pattern = {
    "field": [{"prefix": "your.prefix."}]
}