[CGKIELE-107] mallet - PR review fixes

build.sbt

@@ -96,6 +96,7 @@ scalacOptions := Seq(
   "-unchecked",
   "-deprecation",
   "-feature",
+  "-Xfatal-warnings",
   "-Xlint:unsound-match",
   "-Ywarn-inaccessible",
   "-Ywarn-unused-import",

src/main/scala/io/iohk/ethereum/mallet/interpreter/Commands.scala

@@ -244,7 +244,7 @@ object Commands {
       }
     }
 
-    val helpHeader = "fetch the receipt for a know transaction hash"
+    val helpHeader = "fetch the receipt for a known transaction hash"
     val helpDetail =
       """|Shows the receipt of a transaction given its [hash]. The transaction must be already mined on the blockchain
       """.stripMargin

src/main/scala/io/iohk/ethereum/mallet/main/ConstPasswordReader.scala

@@ -3,8 +3,8 @@ package io.iohk.ethereum.mallet.main
 import io.iohk.ethereum.mallet.service.PasswordReader
 
 /**
-  * This implementation of [[PasswordReader]] is in non-interactive mode when the password is
-  * provided as a command line option
+  * This implementation of [[io.iohk.ethereum.mallet.service.PasswordReader PasswordReader]] is used in
+  * non-interactive mode when the password is provided as a command line option
   */
 class ConstPasswordReader(password: String) extends PasswordReader {
   def readPassword(): Option[String] =

src/main/scala/io/iohk/ethereum/mallet/main/Mallet.scala

@@ -22,7 +22,7 @@ object Mallet extends App {
   private val initialState = {
     new State(
       shell,
-      new RpcClient(clOptions.node),
+      RpcClient(clOptions.node),
       new KeyStoreImpl(clOptions.dataDir, new SecureRandom()),
       clOptions.account,
       None,
@@ -35,7 +35,7 @@ object Mallet extends App {
     val result = Interpreter(cmd, state)
     shell.printLine(result.msg)
 
-    RpcClient.actorSystem.terminate()
+    state.rpcClient.shutdown()
     val exitCode = if (result.error) 1 else 0
     sys.exit(exitCode)
   }
@@ -51,7 +51,7 @@ object Mallet extends App {
         loop(result.state)
 
       case None =>
-        RpcClient.actorSystem.terminate()
+        state.rpcClient.shutdown()
     }
   }
 

src/main/scala/io/iohk/ethereum/mallet/service/RpcClient.scala

@@ -18,30 +18,41 @@ import io.iohk.ethereum.jsonrpc.{JsonRpcError, TransactionReceiptResponse}
 import io.iohk.ethereum.mallet.common.{Constants, Err, RpcClientError, Util}
 
 import scala.concurrent.duration._
-import scala.concurrent.{Await, Future}
+import scala.concurrent.{Await, ExecutionContext, Future}
 import scala.util.{Failure, Success, Try}
 
 object RpcClient {
-  // TODO: CL option to enable akka logging
-  private val akkaConfig = ConfigFactory.load("mallet")
 
-  implicit val actorSystem = ActorSystem("mallet_rpc", akkaConfig)
-  implicit val materializer = ActorMaterializer()
+  /**
+    * This factory method is defining an ActorSystem, ActorMaterializer and ExecutionContext for
+    * the [[RpcClient]]. To customize these dependencies use [[RpcClient]]'s constructor
+    */
+  def apply(node: Uri): RpcClient = {
+    // TODO: CL option to enable akka logging
+    val akkaConfig = ConfigFactory.load("mallet")
+
+    implicit val system = ActorSystem("mallet_rpc", akkaConfig)
+    implicit val mat = ActorMaterializer()
+    implicit val ec = scala.concurrent.ExecutionContext.Implicits.global
+
+    new RpcClient(node)
+  }
 }
 
 /**
   * Talks to a node over HTTP(S) JSON-RPC
-  * Note: the URI schema determins whether HTTP or HTTPS is used
+  * Note: the URI schema determines whether HTTP or HTTPS is used
   */
-class RpcClient(node: Uri) {
+class RpcClient(node: Uri)(implicit system: ActorSystem, mat: ActorMaterializer, ec: ExecutionContext) {
   import CommonJsonCodecs._
-  import RpcClient._
-  import actorSystem.dispatcher
-
 
   //TODO: CL option
   private val httpTimeout = 5.seconds
 
+  def shutdown(): Unit = {
+    Await.ready(system.terminate(), 5.seconds)
+  }
+
   def sendTransaction(rawTx: ByteString): Either[Err, ByteString] =
     doRequest[ByteString]("eth_sendRawTransaction", List(rawTx.asJson))