A port of EasyRules to Golang http://www.easyrules.org/
Please read the EasyRules link for a quick intro to the concepts and workflows.
- Implements default rules engine
- Allows for composite rule (all or nothing)
- Jim Plush - Author/maintainer
package easyrulesgo_test
import (
"fmt"
core "github.com/CrowdStrike/easyrulesgo/core"
)
// example taken from http://www.easyrules.org/tutorials/shop-tutorial.html
type person struct {
name string
age int
adult bool
}
/*-------- AGE RULE --------*/
type ageRule struct {
core.BasicRule
person *person
}
func (a *ageRule) Evaluate() bool {
return a.person.age > a.adultAge()
}
func (a *ageRule) Execute() error {
a.person.adult = true
fmt.Printf("person %s has been marked as adult", a.person.name)
return nil
}
func (a *ageRule) adultAge() int {
return 18
}
func newAgeRule(p *person) *ageRule {
ar := &ageRule{}
ar.person = p
return ar
}
/*-------- ALCOHOL RULE --------*/
type alcoholRule struct {
core.BasicRule
person *person
}
func (a *alcoholRule) Evaluate() bool {
return !a.person.adult
}
func (a *alcoholRule) Execute() error {
fmt.Printf("Shop: Sorry %s you are not allowed to buy alcohol", a.person.name)
return nil
}
func newAlcoholRule(p *person) *alcoholRule {
ar := &alcoholRule{}
ar.person = p
return ar
}
func Example() {
p := &person{name: "Tom", age: 14}
ar := newAgeRule(p)
alcr := newAlcoholRule(p)
re := core.NewDefaultRulesEngine()
re.AddRule(ar)
re.AddRule(alcr)
err := re.FireRules()
if err != nil {
fmt.Println("rules failed!")
}
}
- continuous firing with tickers
- additional rule patterns and DAGs