fsm

Package fsm allows you to add finite-state machines to your Go code.

States and Events are defined as int consts :

const (
    StateFoo fsm.State = iota
    StateBar
)

const (
    EventFoo fsm.Event = iota
    EventBar
)

f := fsm.New(StateFoo)
f.Transition(
    fsm.On(EventFoo), fsm.Src(StateFoo),
    fsm.Dst(StateBar),
)

You can have custom checks or actions :

f.Transition(
    fsm.Src(StateFoo), fsm.Check(func () bool {
        // check something
    }),
    fsm.Call(func () {
        // do something
    }),
)

Transitions can be triggered the second time an event occurs :

f.Transition(
    fsm.On(EventFoo), fsm.Src(StateFoo), fsm.Times(2),
    fsm.Dst(StateBar),
)

Functions call be called when entering or leaving a state :

f.EnterState(StateFoo, func() {
    // do something 
})
f.Enter(func(state fsm.State) {
    // do something 
})
f.ExitState(StateFoo, func() {
    // do something 
})
f.Exit(func(state fsm.State) {
    // do something 
})

Installation

go get github.com/cocoonspace/fsm

Contribution guidelines

Contributions are welcome, as long as:

• unit tests & comments are included,
• no external package is used.

License

MIT - See LICENSE