From 77d4bf6a28da1b73c74a0475c0831512d8d640d3 Mon Sep 17 00:00:00 2001
From: Danno Ferrin <danno.ferrin@shemnon.com>
Date: Mon, 7 Jan 2019 08:52:38 -0700
Subject: [PATCH] Metrics measurement adjustment (#511)

The total difficulty of mainnet is larger than a signed long, so we
need to adjust the way we get the number.
---
 .../pantheon/ethereum/db/DefaultMutableBlockchain.java       | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/db/DefaultMutableBlockchain.java b/ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/db/DefaultMutableBlockchain.java
index 308e95b19f..d5b9bcd7c6 100644
--- a/ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/db/DefaultMutableBlockchain.java
+++ b/ethereum/core/src/main/java/tech/pegasys/pantheon/ethereum/db/DefaultMutableBlockchain.java
@@ -32,6 +32,7 @@
 import tech.pegasys.pantheon.metrics.MetricCategory;
 import tech.pegasys.pantheon.metrics.MetricsSystem;
 import tech.pegasys.pantheon.util.Subscribers;
+import tech.pegasys.pantheon.util.bytes.BytesValues;
 import tech.pegasys.pantheon.util.uint.UInt256;
 
 import java.util.ArrayList;
@@ -69,7 +70,9 @@ public DefaultMutableBlockchain(
         MetricCategory.BLOCKCHAIN,
         "difficulty_total",
         "Total difficulty of the chainhead",
-        () -> (double) this.getChainHead().getTotalDifficulty().toLong());
+        () ->
+            BytesValues.asUnsignedBigInteger(this.getChainHead().getTotalDifficulty().getBytes())
+                .doubleValue());
   }
 
   @Override