Initial client, server, and all the messages

This commit introduces type-safe schemas for all messages exchanged
in the REST protocol. Each message is expected to contain an ACTION
field that has only one possible value for each message type.

Before the message is sent, we validate that all required fields
are in fact present, and that the value of the action field is the
correct type.

The next step is to actually integrate this in standalone mode.

core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

@@ -39,7 +39,8 @@ object SparkSubmit {
   private val STANDALONE = 2
   private val MESOS = 4
   private val LOCAL = 8
-  private val ALL_CLUSTER_MGRS = YARN | STANDALONE | MESOS | LOCAL
+  private val REST = 16
+  private val ALL_CLUSTER_MGRS = YARN | STANDALONE | MESOS | LOCAL | REST
 
   // Deploy modes
   private val CLIENT = 1
@@ -97,7 +98,7 @@ object SparkSubmit {
       case m if m.startsWith("spark") => STANDALONE
       case m if m.startsWith("mesos") => MESOS
       case m if m.startsWith("local") => LOCAL
-      case _ => printErrorAndExit("Master must start with yarn, spark, mesos, or local"); -1
+      case _ => printErrorAndExit("Master must start with yarn, spark, mesos, local, or rest"); -1
     }
 
     // Set the deploy mode; default is client mode

core/src/main/scala/org/apache/spark/deploy/rest/DriverStatusRequestMessage.scala

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.rest
+
+/**
+ * A field used in a DriverStatusRequestMessage.
+ */
+private[spark] abstract class DriverStatusRequestField extends StandaloneRestProtocolField
+private[spark] object DriverStatusRequestField extends StandaloneRestProtocolFieldCompanion {
+  case object ACTION extends DriverStatusRequestField
+  case object SPARK_VERSION extends DriverStatusRequestField
+  case object MESSAGE extends DriverStatusRequestField
+  case object MASTER extends DriverStatusRequestField
+  case object DRIVER_ID extends DriverStatusRequestField
+  override val requiredFields = Seq(ACTION, SPARK_VERSION, MASTER, DRIVER_ID)
+  override val optionalFields = Seq(MESSAGE)
+}
+
+/**
+ * A request sent to the standalone Master to query the status of a driver.
+ */
+private[spark] class DriverStatusRequestMessage extends StandaloneRestProtocolMessage(
+  StandaloneRestProtocolAction.DRIVER_STATUS_REQUEST,
+  DriverStatusRequestField.ACTION,
+  DriverStatusRequestField.requiredFields)
+
+private[spark] object DriverStatusRequestMessage extends StandaloneRestProtocolMessageCompanion {
+  protected override def newMessage(): StandaloneRestProtocolMessage =
+    new DriverStatusRequestMessage
+  protected override def fieldWithName(field: String): StandaloneRestProtocolField =
+    DriverStatusRequestField.withName(field)
+}

core/src/main/scala/org/apache/spark/deploy/rest/DriverStatusResponseMessage.scala

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.rest
+
+/**
+ * A field used in a DriverStatusResponseMessage.
+ */
+private[spark] abstract class DriverStatusResponseField extends StandaloneRestProtocolField
+private[spark] object DriverStatusResponseField extends StandaloneRestProtocolFieldCompanion {
+  case object ACTION extends DriverStatusResponseField
+  case object SPARK_VERSION extends DriverStatusResponseField
+  case object MESSAGE extends DriverStatusResponseField
+  case object MASTER extends DriverStatusResponseField
+  case object DRIVER_ID extends DriverStatusResponseField
+  case object DRIVER_STATE extends SubmitDriverResponseField
+  case object WORKER_ID extends SubmitDriverResponseField
+  case object WORKER_HOST_PORT extends SubmitDriverResponseField
+  override val requiredFields = Seq(ACTION, SPARK_VERSION, MESSAGE,
+    MASTER, DRIVER_ID, DRIVER_STATE, WORKER_ID, WORKER_HOST_PORT)
+  override val optionalFields = Seq.empty
+}
+
+/**
+ * A message sent from the standalone Master in response to a DriverStatusResponseMessage.
+ */
+private[spark] class DriverStatusResponseMessage extends StandaloneRestProtocolMessage(
+  StandaloneRestProtocolAction.DRIVER_STATUS_RESPONSE,
+  DriverStatusResponseField.ACTION,
+  DriverStatusResponseField.requiredFields)
+
+private[spark] object DriverStatusResponseMessage extends StandaloneRestProtocolMessageCompanion {
+  protected override def newMessage(): StandaloneRestProtocolMessage =
+    new DriverStatusResponseMessage
+  protected override def fieldWithName(field: String): StandaloneRestProtocolField =
+    DriverStatusResponseField.withName(field)
+}

core/src/main/scala/org/apache/spark/deploy/rest/ErrorMessage.scala

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.rest
+
+/**
+ * A field used in a ErrorMessage.
+ */
+private[spark] abstract class ErrorField extends StandaloneRestProtocolField
+private[spark] object ErrorField extends StandaloneRestProtocolFieldCompanion {
+  case object ACTION extends ErrorField
+  case object SPARK_VERSION extends ErrorField
+  case object MESSAGE extends ErrorField
+  override val requiredFields = Seq(ACTION, SPARK_VERSION, MESSAGE)
+  override val optionalFields = Seq.empty
+}
+
+/**
+ * An error message exchanged in the standalone REST protocol.
+ */
+private[spark] class ErrorMessage extends StandaloneRestProtocolMessage(
+  StandaloneRestProtocolAction.ERROR,
+  ErrorField.ACTION,
+  ErrorField.requiredFields)
+
+private[spark] object ErrorMessage extends StandaloneRestProtocolMessageCompanion {
+  protected override def newMessage(): StandaloneRestProtocolMessage = new ErrorMessage
+  protected override def fieldWithName(field: String): StandaloneRestProtocolField =
+    ErrorField.withName(field)
+}

core/src/main/scala/org/apache/spark/deploy/rest/KillDriverRequestMessage.scala

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.rest
+
+/**
+ * A field used in a KillDriverRequestMessage.
+ */
+private[spark] abstract class KillDriverRequestField extends StandaloneRestProtocolField
+private[spark] object KillDriverRequestField extends StandaloneRestProtocolFieldCompanion {
+  case object ACTION extends KillDriverRequestField
+  case object SPARK_VERSION extends KillDriverRequestField
+  case object MESSAGE extends KillDriverRequestField
+  case object MASTER extends KillDriverRequestField
+  case object DRIVER_ID extends KillDriverRequestField
+  override val requiredFields = Seq(ACTION, SPARK_VERSION, MASTER, DRIVER_ID)
+  override val optionalFields = Seq(MESSAGE)
+}
+
+/**
+ * A request sent to the standalone Master to kill a driver.
+ */
+private[spark] class KillDriverRequestMessage extends StandaloneRestProtocolMessage(
+  StandaloneRestProtocolAction.KILL_DRIVER_REQUEST,
+  KillDriverRequestField.ACTION,
+  KillDriverRequestField.requiredFields)
+
+private[spark] object KillDriverRequestMessage extends StandaloneRestProtocolMessageCompanion {
+  protected override def newMessage(): StandaloneRestProtocolMessage =
+    new KillDriverRequestMessage
+  protected override def fieldWithName(field: String): StandaloneRestProtocolField =
+    KillDriverRequestField.withName(field)
+}

core/src/main/scala/org/apache/spark/deploy/rest/KillDriverResponseMessage.scala

@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.rest
+
+/**
+ * A field used in a KillDriverResponseMessage.
+ */
+private[spark] abstract class KillDriverResponseField extends StandaloneRestProtocolField
+private[spark] object KillDriverResponseField extends StandaloneRestProtocolFieldCompanion {
+  case object ACTION extends KillDriverResponseField
+  case object SPARK_VERSION extends KillDriverResponseField
+  case object MESSAGE extends KillDriverResponseField
+  case object MASTER extends KillDriverResponseField
+  case object DRIVER_ID extends KillDriverResponseField
+  case object DRIVER_STATE extends SubmitDriverResponseField
+  override val requiredFields = Seq(ACTION, SPARK_VERSION, MESSAGE, MASTER, DRIVER_ID, DRIVER_STATE)
+  override val optionalFields = Seq.empty
+}
+
+/**
+ * A message sent from the standalone Master in response to a KillDriverResponseMessage.
+ */
+private[spark] class KillDriverResponseMessage extends StandaloneRestProtocolMessage(
+  StandaloneRestProtocolAction.KILL_DRIVER_RESPONSE,
+  KillDriverResponseField.ACTION,
+  KillDriverResponseField.requiredFields)
+
+private[spark] object KillDriverResponseMessage extends StandaloneRestProtocolMessageCompanion {
+  protected override def newMessage(): StandaloneRestProtocolMessage =
+    new KillDriverResponseMessage
+  protected override def fieldWithName(field: String): StandaloneRestProtocolField =
+    KillDriverResponseField.withName(field)
+}