fix: add cause to transaction errors on transaction commit (#108)

rockwotj · web-flow · commit 00b3c6f933ee · 2020-02-18T18:06:37.000-05:00
diff --git a/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FirestoreException.java b/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FirestoreException.java
@@ -28,7 +28,11 @@ public final class FirestoreException extends BaseGrpcServiceException {
   private Status status;
 
   private FirestoreException(String reason, Status status) {
-    super(reason, null, status.getCode().value(), false);
+    this(reason, status, null);
+  }
+
+  private FirestoreException(String reason, Status status, @Nullable Throwable cause) {
+    super(reason, cause, status.getCode().value(), false);
 
     this.status = status;
   }
@@ -58,7 +62,18 @@ static FirestoreException invalidState(String message, Object... params) {
    * @return The FirestoreException
    */
   static FirestoreException serverRejected(Status status, String message, Object... params) {
-    return new FirestoreException(String.format(message, params), status);
+    return serverRejected(status, null, message, params);
+  }
+
+  /**
+   * Creates a FirestoreException with the provided GRPC Status code and message in a nested
+   * exception.
+   *
+   * @return The FirestoreException
+   */
+  static FirestoreException serverRejected(
+      Status status, @Nullable Throwable cause, String message, Object... params) {
+    return new FirestoreException(String.format(message, params), status, cause);
   }
 
   /**
diff --git a/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FirestoreImpl.java b/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FirestoreImpl.java
@@ -360,7 +360,7 @@ public void onSuccess(final T userResult) {
                           @Override
                           public void onFailure(Throwable throwable) {
                             // Retry failed commits.
-                            maybeRetry();
+                            maybeRetry(throwable);
                           }
 
                           @Override
@@ -393,7 +393,7 @@ public void run() {
             return callbackResult;
           }
 
-          private void maybeRetry() {
+          private void maybeRetry(Throwable throwable) {
             if (attemptsRemaining > 0) {
               span.addAnnotation("retrying");
               runTransactionAttempt(
@@ -406,7 +406,9 @@ private void maybeRetry() {
               span.setStatus(TOO_MANY_RETRIES_STATUS);
               rejectTransaction(
                   FirestoreException.serverRejected(
-                      Status.ABORTED, "Transaction was cancelled because of too many retries."));
+                      Status.ABORTED,
+                      throwable,
+                      "Transaction was cancelled because of too many retries."));
             }
           }
 
