From cb6797251245f61ca437f4cfaf24e07db6484975 Mon Sep 17 00:00:00 2001
From: Dave Collins <davec@conformal.com>
Date: Thu, 26 Jun 2014 18:04:01 -0500
Subject: [PATCH] Detect error strings on SumitBlock.

The submitblock RPC returns a string containing an error if it failed for
any reason.  This comment detects a non-null return from submitblock and
converts that string to an error which is returned.
---
 mining.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mining.go b/mining.go
index b98f89a5..846de39a 100644
--- a/mining.go
+++ b/mining.go
@@ -369,11 +369,16 @@ type FutureSubmitBlockResult chan *response
 // Receive waits for the response promised by the future and returns an error if
 // any occurred when submitting the block.
 func (r FutureSubmitBlockResult) Receive() error {
-	_, err := receiveFuture(r)
+	res, err := receiveFuture(r)
 	if err != nil {
 		return err
 	}
 
+	resStr := string(res)
+	if resStr != "null" {
+		return errors.New(resStr)
+	}
+
 	return nil
 
 }