feat: add Log, Notify and Triggers

Imported from CityOfZion/neo-storm (5065465e39fd2b308c487f49f75f517620139660).

examples/check_witness.go

@@ -1,17 +0,0 @@
-package check_witness_contract
-
-import (
-	"github.com/CityOfZion/neo-go-sc/interop/runtime"
-	"github.com/CityOfZion/neo-go-sc/interop/util"
-)
-
-// Check if the invoker of the contract is the specified owner.
-
-var owner = util.FromAddress("Aej1fe4mUgou48Zzup5j8sPrE3973cJ5oz")
-
-func Main() bool {
-	if runtime.CheckWitness(owner) {
-		return true
-	}
-	return false
-}

examples/runtime/runtime.go

@@ -0,0 +1,43 @@
+package runtime_contract
+
+import (
+	"github.com/CityOfZion/neo-go-sc/interop/runtime"
+	"github.com/CityOfZion/neo-go-sc/interop/util"
+)
+
+// Check if the invoker of the contract is the specified owner
+var owner = util.FromAddress("Aej1fe4mUgou48Zzup5j8sPrE3973cJ5oz")
+
+func Main(operation string, args []interface{}) bool {
+	trigger := runtime.GetTrigger()
+
+	// Log owner upon Verification trigger
+	if trigger == runtime.Verification() {
+		if runtime.CheckWitness(owner) {
+			runtime.Log("Verified Owner")
+		}
+		return true
+	}
+
+	// Discerns between log and notify for this test
+	if trigger == runtime.Application() {
+		return handleOperation(operation, args)
+	}
+
+	return false
+}
+
+func handleOperation(operation string, args []interface{}) bool {
+	if operation == "log" {
+		message := args[0].(string)
+		runtime.Log(message)
+		return true
+	}
+
+	if operation == "notify" {
+		runtime.Notify(args[0])
+		return true
+	}
+
+	return false
+}

interop/runtime/runtime.go

@@ -1,6 +1,30 @@
 package runtime
 
-// CheckWitness verifies if the given hash is the invoker of the contract.
+// CheckWitness verifies if the given hash is the invoker of the contract
 func CheckWitness(hash []byte) bool {
 	return true
 }
+
+// Notify passes data to the VM
+func Notify(arg interface{}) int {
+	return 0
+}
+
+// Log passes a message to the VM
+func Log(message string) {}
+
+// Application returns the Application trigger type
+func Application() byte {
+	return 0x10
+}
+
+// Verification returns the Verification trigger type
+func Verification() byte {
+	return 0x00
+}
+
+// GetTrigger return the current trigger type. The return in this function
+// Doesn't really matter, this is just an interop placeholder
+func GetTrigger() interface{} {
+	return 0
+}