FSM for Go

Basic Example

package mainimport ("context""fmt""github.com/looplab/fsm")funcmain() {fsm:=fsm.NewFSM("closed",        fsm.Events{            {Name:"open",Src: []string{"closed"},Dst:"open"},            {Name:"close",Src: []string{"open"},Dst:"closed"},        },        fsm.Callbacks{},    )fmt.Println(fsm.Current())err:=fsm.Event(context.Background(),"open")iferr!=nil {fmt.Println(err)    }fmt.Println(fsm.Current())err=fsm.Event(context.Background(),"close")iferr!=nil {fmt.Println(err)    }fmt.Println(fsm.Current())}

Usage as a struct field

package mainimport ("context""fmt""github.com/looplab/fsm")typeDoorstruct {TostringFSM*fsm.FSM}funcNewDoor(tostring)*Door {d:=&Door{To:to,    }d.FSM=fsm.NewFSM("closed",        fsm.Events{            {Name:"open",Src: []string{"closed"},Dst:"open"},            {Name:"close",Src: []string{"open"},Dst:"closed"},        },        fsm.Callbacks{"enter_state":func(_ context.Context,e*fsm.Event) {d.enterState(e) },        },    )returnd}func (d*Door)enterState(e*fsm.Event) {fmt.Printf("The door to %s is %s\n",d.To,e.Dst)}funcmain() {door:=NewDoor("heaven")err:=door.FSM.Event(context.Background(),"open")iferr!=nil {fmt.Println(err)    }err=door.FSM.Event(context.Background(),"close")iferr!=nil {fmt.Println(err)    }}

License