Merge pull request #444 from input-output-hk/feature/vm_logging

Add vm log

Author: Łukasz Gąsior

src/main/scala/io/iohk/ethereum/nodebuilder/VmSetup.scala

@@ -5,16 +5,17 @@ import java.lang.ProcessBuilder.Redirect
 import akka.actor.ActorSystem
 import io.iohk.ethereum.extvm.{ExtVMInterface, VmServerApp}
 import io.iohk.ethereum.ledger.Ledger.VMImpl
-import io.iohk.ethereum.utils.{BlockchainConfig, VmConfig}
+import io.iohk.ethereum.utils.{BlockchainConfig, Logger, VmConfig}
 import io.iohk.ethereum.utils.VmConfig.ExternalConfig
 
-object VmSetup {
+object VmSetup extends Logger {
 
   import VmConfig.VmMode._
 
   def vm(vmConfig: VmConfig, blockchainConfig: BlockchainConfig, testMode: Boolean)(implicit actorSystem: ActorSystem): VMImpl =
     (vmConfig.mode, vmConfig.externalConfig) match {
       case (Internal, _) =>
+        log.info("Using Mantis internal VM")
         new VMImpl
 
       case (External, Some(extConf)) =>
@@ -28,12 +29,15 @@ object VmSetup {
   private def startExternalVm(externalConfig: ExternalConfig): Unit = {
     externalConfig.vmType match {
       case "iele" | "kevm" =>
+        log.info(s"Starting external ${externalConfig.vmType} VM process using executable path")
         startStandardVmProcess(externalConfig)
 
       case "mantis" =>
+        log.info("Starting external Mantis VM process using executable path")
         startMantisVmProcess(externalConfig)
 
       case "none" =>
+        log.info("Using external VM process not managed by Mantis")
         // expect the vm to be started by external means
     }
   }