SNMP plugin fixes

fixes #873

CHANGELOG.md

@@ -20,6 +20,7 @@
 - [#656](https://github.com/influxdata/telegraf/issues/656): No longer run `lsof` on linux to get netstat data, fixes permissions issue.
 - [#907](https://github.com/influxdata/telegraf/issues/907): Fix prometheus invalid label/measurement name key.
 - [#841](https://github.com/influxdata/telegraf/issues/841): Fix memcached unix socket panic.
+- [#873](https://github.com/influxdata/telegraf/issues/873): Fix SNMP plugin sometimes not returning metrics. Thanks @titiliambert!
 
 ## v0.11.1 [2016-03-17]
 

plugins/inputs/snmp/README.md

@@ -492,12 +492,12 @@ Note: the plugin will add instance name as tag *instance*
     # oid attribute is useless
 
   # SNMP SUBTABLES
-  [[plugins.snmp.subtable]]
+  [[inputs.snmp.subtable]]
     name = "bytes_recv"
     oid = ".1.3.6.1.2.1.31.1.1.1.6"
     unit = "octets"
 
-  [[plugins.snmp.subtable]]
+  [[inputs.snmp.subtable]]
     name = "bytes_send"
     oid = ".1.3.6.1.2.1.31.1.1.1.10"
     unit = "octets"
@@ -505,10 +505,10 @@ Note: the plugin will add instance name as tag *instance*
 
 #### Configuration notes
 
-- In **plugins.snmp.table** section, the `oid` attribute is useless if
+- In **inputs.snmp.table** section, the `oid` attribute is useless if
   the `sub_tables` attributes is defined
 
-- In **plugins.snmp.subtable** section, you can put a name from `snmptranslate_file`
+- In **inputs.snmp.subtable** section, you can put a name from `snmptranslate_file`
   as `oid` attribute instead of a valid OID
 
 ### Measurements & Fields:

plugins/inputs/snmp/snmp.go

@@ -4,7 +4,6 @@ import (
 	"io/ioutil"
 	"log"
 	"net"
-	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -308,11 +307,10 @@ func (s *Snmp) Gather(acc telegraf.Accumulator) error {
 			return err
 		} else {
 			for _, line := range strings.Split(string(data), "\n") {
-				oidsRegEx := regexp.MustCompile(`([^\t]*)\t*([^\t]*)`)
-				oids := oidsRegEx.FindStringSubmatch(string(line))
-				if oids[2] != "" {
-					oid_name := oids[1]
-					oid := oids[2]
+				oids := strings.Fields(string(line))
+				if len(oids) == 2 && oids[1] != "" {
+					oid_name := oids[0]
+					oid := oids[1]
 					fillnode(s.initNode, oid_name, strings.Split(string(oid), "."))
 					s.nameToOid[oid_name] = oid
 				}