rules

Documentation

Overview

Package rules compiles and evaluates the boolean expressions used by choice nodes. Expressions are written in expr-lang and evaluated against the shared execution payload, exposed as the variable `payload`.

when: "payload.risk_score > 80"

Index

• type Program
  • func Compile(code string) (*Program, error)
  • func (p *Program) Match(payload json.RawMessage) (bool, error)

Types

type Program

type Program struct {
	// contains filtered or unexported fields
}

Program is a compiled choice expression.

func Compile

func Compile(code string) (*Program, error)

Compile compiles a boolean expression that may reference `payload`.

func (*Program) Match

func (p *Program) Match(payload json.RawMessage) (bool, error)

Match evaluates the program against the JSON payload. A nil/zero result and a non-nil error are returned when evaluation fails (e.g. a referenced field is missing); callers typically treat that as "no match" and fall through to the default rule.