neo-go/examples/runtime/runtime.go
Roman Khimov fe27ae9b96 examples: completely rework runtime example
Make it more useful, triggers are largely obsolete (2.x thing).
2022-03-25 16:47:15 +03:00

81 lines
2.3 KiB
Go

package runtimecontract
import (
"github.com/nspcc-dev/neo-go/pkg/interop/native/management"
"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
"github.com/nspcc-dev/neo-go/pkg/interop/util"
)
var (
// Check if the invoker of the contract is the specified owner
owner = util.FromAddress("NbrUYaZgyhSkNoRo9ugRyEMdUZxrhkNaWB")
)
// init is transformed into _initialize method that is called whenever contract
// is being loaded (so you'll see this log entry with every invocation).
func init() {
// No events and logging allowed in verification context.
if runtime.GetTrigger() != runtime.Verification {
runtime.Log("init called")
}
}
// _deploy is called after contract deployment or update, it'll be called
// in deployment transaction and if call update method of this contract.
func _deploy(_ interface{}, isUpdate bool) {
if isUpdate {
Log("_deploy method called after contract update")
return
}
Log("_deploy method called after contract creation")
}
// CheckWitness checks owner's witness. It returns true if invoked by the owner
// and false otherwise.
func CheckWitness() bool {
if runtime.CheckWitness(owner) {
runtime.Log("Verified Owner")
return true
}
return false
}
// Log logs given message.
func Log(message string) {
runtime.Log(message)
}
// Notify emits an event with the specified data.
func Notify(event interface{}) {
runtime.Notify("Event", event)
}
// Verify method is used when contract is being used as a signer of transaction,
// it can have parameters (that then need to be present in invocation script)
// and it returns simple pass/fail result. This implementation just checks for
// owner's signature presence.
func Verify() bool {
// Technically this restriction is not needed, but you can see the difference
// between invokefunction and invokecontractverify RPC methods with it.
if runtime.GetTrigger() != runtime.Verification {
return false
}
return CheckWitness()
}
// Destroy destroys the contract, only owner can do that.
func Destroy() {
if !Verify() {
panic("only owner can destroy")
}
management.Destroy()
}
// Update updates the contract, only owner can do that. _deploy will be called
// after update.
func Update(nef, manifest []byte) {
if !Verify() {
panic("only owner can update")
}
management.Update(nef, manifest)
}