Invoke()

func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
   fmt.Println("invoke is running " + function)

   // Handle different functions
   if function == "init" {
       return t.Init(stub, "init", args)
   } else if function == "write" {
       return t.write(stub, args)
   }
   fmt.Println("invoke did not find func: " + function)

   return nil, errors.New("Received unknown function invocation")
}