Make JSch injection lazy

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=154958750

java/google/registry/rde/RdeUploadAction.java

@@ -32,6 +32,7 @@ import com.google.common.io.ByteStreams;
 import com.googlecode.objectify.VoidWork;
 import com.jcraft.jsch.JSch;
 import com.jcraft.jsch.JSchException;
+import dagger.Lazy;
 import google.registry.config.RegistryConfig.Config;
 import google.registry.gcs.GcsUtils;
 import google.registry.keyring.api.KeyModule.Key;
@@ -87,7 +88,15 @@ public final class RdeUploadAction implements Runnable, EscrowTask {
   @Inject GcsUtils gcsUtils;
   @Inject Ghostryde ghostryde;
   @Inject EscrowTaskRunner runner;
-  @Inject JSch jsch;
+
+  // Using Lazy<JSch> instead of JSch to prevent fetching of rdeSsh*Keys before we know we're
+  // actually going to use them. See b/37868282
+  //
+  // This prevents making an unnecessary time-expensive (and potentially failing) API call to the
+  // external KMS system when the RdeUploadAction ends up not being used (if the EscrowTaskRunner
+  // determins this EscrowTask was already completed today).
+  @Inject Lazy<JSch> lazyJsch;
+
   @Inject JSchSshSessionFactory jschSshSessionFactory;
   @Inject Response response;
   @Inject RydePgpCompressionOutputStreamFactory pgpCompressionFactory;
@@ -193,7 +202,7 @@ public final class RdeUploadAction implements Runnable, EscrowTask {
         Ghostryde.Decryptor decryptor = ghostryde.openDecryptor(gcsInput, stagingDecryptionKey);
         Ghostryde.Decompressor decompressor = ghostryde.openDecompressor(decryptor);
         Ghostryde.Input xmlInput = ghostryde.openInput(decompressor)) {
-      try (JSchSshSession session = jschSshSessionFactory.create(jsch, uploadUrl);
+      try (JSchSshSession session = jschSshSessionFactory.create(lazyJsch.get(), uploadUrl);
           JSchSftpChannel ftpChan = session.openSftpChannel()) {
         byte[] signature;
         String rydeFilename = name + ".ryde";

javatests/google/registry/export/BigqueryPollJobActionTest.java

@@ -33,7 +33,6 @@ import com.google.api.services.bigquery.model.JobStatus;
 import com.google.appengine.api.taskqueue.TaskOptions;
 import com.google.appengine.api.taskqueue.TaskOptions.Method;
 import com.google.appengine.api.taskqueue.dev.QueueStateInfo.TaskStateInfo;
-import dagger.Lazy;
 import google.registry.export.BigqueryPollJobAction.BigqueryPollJobEnqueuer;
 import google.registry.request.HttpException.BadRequestException;
 import google.registry.request.HttpException.NotModifiedException;
@@ -41,6 +40,7 @@ import google.registry.testing.AppEngineRule;
 import google.registry.testing.ExceptionRule;
 import google.registry.testing.FakeClock;
 import google.registry.testing.FakeSleeper;
+import google.registry.testing.Lazies;
 import google.registry.testing.TaskQueueHelper;
 import google.registry.testing.TaskQueueHelper.TaskMatcher;
 import google.registry.util.CapturingLogHandler;
@@ -94,12 +94,7 @@ public class BigqueryPollJobActionTest {
     action.enqueuer = ENQUEUER;
     action.projectId = PROJECT_ID;
     action.jobId = JOB_ID;
-    action.chainedQueueName =
-        new Lazy<String>() {
-          @Override
-          public String get() {
-            return CHAINED_QUEUE_NAME;
-          }};
+    action.chainedQueueName = Lazies.of(CHAINED_QUEUE_NAME);
     Logger.getLogger(BigqueryPollJobAction.class.getName()).addHandler(logHandler);
   }
 

javatests/google/registry/rde/RdeUploadActionTest.java

@@ -68,6 +68,7 @@ import google.registry.testing.FakeResponse;
 import google.registry.testing.FakeSleeper;
 import google.registry.testing.GpgSystemCommandRule;
 import google.registry.testing.IoSpyRule;
+import google.registry.testing.Lazies;
 import google.registry.testing.Providers;
 import google.registry.testing.TaskQueueHelper.TaskMatcher;
 import google.registry.testing.sftp.SftpServerRule;
@@ -189,10 +190,11 @@ public class RdeUploadActionTest {
       action.clock = clock;
       action.gcsUtils = new GcsUtils(gcsService, BUFFER_SIZE);
       action.ghostryde = new Ghostryde(BUFFER_SIZE);
-      action.jsch =
-          JSchModule.provideJSch(
-              "user@ignored",
-              keyring.getRdeSshClientPrivateKey(), keyring.getRdeSshClientPublicKey());
+      action.lazyJsch =
+          Lazies.of(
+              JSchModule.provideJSch(
+                  "user@ignored",
+                  keyring.getRdeSshClientPrivateKey(), keyring.getRdeSshClientPublicKey()));
       action.jschSshSessionFactory = new JSchSshSessionFactory(standardSeconds(3));
       action.response = response;
       action.pgpCompressionFactory = compressFactory;
@@ -285,7 +287,7 @@ public class RdeUploadActionTest {
     persistResource(
         Cursor.create(CursorType.RDE_STAGING, stagingCursor, Registry.get("tld")));
     RdeUploadAction action = createAction(uploadUrl);
-    action.jsch = createThrowingJSchSpy(action.jsch, 2);
+    action.lazyJsch = Lazies.of(createThrowingJSchSpy(action.lazyJsch.get(), 2));
     action.runWithLock(uploadCursor);
     assertThat(response.getStatus()).isEqualTo(200);
     assertThat(response.getContentType()).isEqualTo(PLAIN_TEXT_UTF_8);
@@ -306,7 +308,7 @@ public class RdeUploadActionTest {
     persistResource(
         Cursor.create(CursorType.RDE_STAGING, stagingCursor, Registry.get("tld")));
     RdeUploadAction action = createAction(uploadUrl);
-    action.jsch = createThrowingJSchSpy(action.jsch, 3);
+    action.lazyJsch = Lazies.of(createThrowingJSchSpy(action.lazyJsch.get(), 3));
     thrown.expect(RuntimeException.class, "The crow flies in square circles.");
     action.runWithLock(uploadCursor);
   }

javatests/google/registry/testing/Lazies.java

@@ -0,0 +1,32 @@
+// Copyright 2017 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed 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 google.registry.testing;
+
+import dagger.Lazy;
+
+/** Helper functions for {@link Lazy}. */
+public final class Lazies {
+
+  /**
+   * Returns a {@link Lazy} that supplies a constant value.
+   */
+  public static <T> Lazy<T> of(final T instance) {
+    return new Lazy<T>() {
+      @Override
+      public T get() {
+        return instance;
+      }};
+  }
+}