neoneo-go/examples/timer/timer.go

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package timer
import (
"github.com/nspcc-dev/neo-go/pkg/interop/contract"
"github.com/nspcc-dev/neo-go/pkg/interop/engine"
"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
"github.com/nspcc-dev/neo-go/pkg/interop/storage"
"github.com/nspcc-dev/neo-go/pkg/interop/util"
)
const defaultTicks = 3
var (
// ctx holds storage context for contract methods
ctx storage.Context
// Check if the invoker of the contract is the specified owner
owner = util.FromAddress("NULwe3UAHckN2fzNdcVg31tDiaYtMDwANt")
// ticksKey is a storage key for ticks counter
ticksKey = []byte("ticks")
)
func init() {
ctx = storage.GetContext()
}
func _deploy(isUpdate bool) {
if isUpdate {
ticksLeft := storage.Get(ctx, ticksKey).(int) + 1
storage.Put(ctx, ticksKey, ticksLeft)
runtime.Log("One more tick is added.")
return
}
storage.Put(ctx, ticksKey, defaultTicks)
runtime.Log("Timer set to " + itoa(defaultTicks) + " ticks.")
}
// Migrate migrates the contract.
func Migrate(script []byte, manifest []byte) bool {
if !runtime.CheckWitness(owner) {
runtime.Log("Only owner is allowed to update the contract.")
return false
}
contract.Update(script, manifest)
runtime.Log("Contract updated.")
return true
}
// Tick decrement ticks count and checks whether the timer is fired.
func Tick() bool {
runtime.Log("Tick-tock.")
ticksLeft := storage.Get(ctx, ticksKey)
ticksLeft = ticksLeft.(int) - 1
if ticksLeft == 0 {
runtime.Log("Fired!")
return engine.AppCall(runtime.GetExecutingScriptHash(), "selfDestroy").(bool)
}
storage.Put(ctx, ticksKey, ticksLeft)
runtime.Log(itoa(ticksLeft.(int)) + " ticks left.")
return true
}
// SelfDestroy destroys the contract.
func SelfDestroy() bool {
if !(runtime.CheckWitness(owner) || runtime.CheckWitness(runtime.GetExecutingScriptHash())) {
runtime.Log("Only owner or the contract itself are allowed to destroy the contract.")
return false
}
contract.Destroy()
runtime.Log("Destroyed.")
return true
}
// itoa converts int to string
func itoa(i int) string {
digits := "0123456789"
var (
res string
isNegative bool
)
if i < 0 {
i = -i
isNegative = true
}
for {
r := i % 10
res = digits[r:r+1] + res
i = i / 10
if i == 0 {
break
}
}
if isNegative {
res = "-" + res
}
return res
}