/
envy.go
110 lines (94 loc) · 2.27 KB
/
envy.go
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package envy
import (
"log"
"reflect"
"runtime"
"sync"
)
type Object interface{}
type Slot interface{}
type SlotVal reflect.Value
type Signal struct {
id int
}
var idCounter int = 0
var idMutex sync.Mutex = sync.Mutex{}
var registeredSlot map[int][]SlotVal = map[int][]SlotVal{}
/* Create a new signal */
func New() Signal {
idMutex.Lock()
signal := Signal{idCounter}
idCounter++
idMutex.Unlock()
return signal
}
/* Connect a signal to a slot */
func Connect(signal Signal, slot Slot) {
if !isFunction(slot) {
log.Println("error: not a slot/function")
return
}
signalID := signal.id
if registeredSlot[signalID] == nil {
registeredSlot[signalID] = []SlotVal{}
}
slotval := SlotVal(reflect.ValueOf(slot))
if !containsSlot(registeredSlot[signalID], slotval) {
registeredSlot[signalID] = append(registeredSlot[signalID], slotval)
} else {
log.Println("warning: slot already connected to signal")
}
}
/* Deletes all slots registered to a signal */
func DeleteSlots(signal Signal) {
delete(registeredSlot, signal.id)
}
/* Emit a signal with the given parameters */
func Emit(signal Signal, params ...Object) {
signalID := signal.id
if registeredSlot[signalID] == nil {
registeredSlot[signalID] = []SlotVal{}
}
slots := registeredSlot[signalID]
for _, slot := range slots {
slottype := reflect.Value(slot).Type()
paramlist := []reflect.Value{}
/* Try to match number of parameters */
if slottype.IsVariadic() {
for _, param := range params {
paramlist = append(paramlist, reflect.ValueOf(param))
}
} else {
for i := 0; i < slottype.NumIn(); i++ {
paramlist = append(paramlist, reflect.ValueOf(params[i]))
}
}
go func(slot SlotVal, paramlist []reflect.Value) {
defer crashHandler("Fatal: Cannot call slot/function")
reflect.Value(slot).Call(paramlist)
}(slot, paramlist)
}
}
func containsSlot(slots []SlotVal, slot SlotVal) bool {
for _, s := range slots {
if slot == s {
return true
}
}
return false
}
func isFunction(obj Object) bool {
f := reflect.ValueOf(obj)
return f.Kind() == reflect.Func
}
func crashHandler(msg string) {
if r := recover(); r != nil {
log.Println(msg)
log.Println(r)
// Print stack
bufsize := 4096
buf := make([]byte, bufsize)
runtime.Stack(buf, false)
log.Println(string(buf))
}
}