From b762546fa7aa17be693f392cdf719fbebaccf663 Mon Sep 17 00:00:00 2001
From: Cameron Sparr <cameronsparr@gmail.com>
Date: Wed, 21 Dec 2016 10:51:07 +0000
Subject: [PATCH] docker: check type when totalling blkio & net metrics

closes #2027
---
 CHANGELOG.md                    |  1 +
 plugins/inputs/docker/docker.go | 30 ++++++++++++++++++++++++++----
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ad357f66..dd0f848a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,7 @@ plugins, not just statsd.
 - [#1825](https://github.com/influxdata/telegraf/issues/1825): Consul plugin: add check_id as a tag in metrics to avoid overwrites.
 - [#1973](https://github.com/influxdata/telegraf/issues/1973): Partial fix: logparser CLF pattern with IPv6 addresses.
 - [#1975](https://github.com/influxdata/telegraf/issues/1975) & [#2102](https://github.com/influxdata/telegraf/issues/2102): Fix thread-safety when using multiple instances of the statsd input plugin.
+- [#2027](https://github.com/influxdata/telegraf/issues/2027): docker input: interface conversion panic fix.
 
 ## v1.1.2 [2016-12-12]
 
diff --git a/plugins/inputs/docker/docker.go b/plugins/inputs/docker/docker.go
index 7fc48689f..82a3791b6 100644
--- a/plugins/inputs/docker/docker.go
+++ b/plugins/inputs/docker/docker.go
@@ -368,11 +368,22 @@ func gatherContainerStats(
 				if field == "container_id" {
 					continue
 				}
+
+				var uintV uint64
+				switch v := value.(type) {
+				case uint64:
+					uintV = v
+				case int64:
+					uintV = uint64(v)
+				default:
+					continue
+				}
+
 				_, ok := totalNetworkStatMap[field]
 				if ok {
-					totalNetworkStatMap[field] = totalNetworkStatMap[field].(uint64) + value.(uint64)
+					totalNetworkStatMap[field] = totalNetworkStatMap[field].(uint64) + uintV
 				} else {
-					totalNetworkStatMap[field] = value
+					totalNetworkStatMap[field] = uintV
 				}
 			}
 		}
@@ -491,11 +502,22 @@ func gatherBlockIOMetrics(
 				if field == "container_id" {
 					continue
 				}
+
+				var uintV uint64
+				switch v := value.(type) {
+				case uint64:
+					uintV = v
+				case int64:
+					uintV = uint64(v)
+				default:
+					continue
+				}
+
 				_, ok := totalStatMap[field]
 				if ok {
-					totalStatMap[field] = totalStatMap[field].(uint64) + value.(uint64)
+					totalStatMap[field] = totalStatMap[field].(uint64) + uintV
 				} else {
-					totalStatMap[field] = value
+					totalStatMap[field] = uintV
 				}
 			}
 		}