Translate snmp field values (#8466)

plugins/inputs/snmp/README.md

@@ -184,6 +184,10 @@ One [metric][] is created for each row of the SNMP table.
       ## path segments). Truncates the index after this point to remove non-fixed
       ## value or length index suffixes.
       # oid_index_length = 0
+
+      ## Specifies if the value of given field should be snmptranslated
+      ## by default no field values are translated
+      # translate = true
 ```
 
 ### Troubleshooting

plugins/inputs/snmp/snmp.go

@@ -237,6 +237,8 @@ type Field struct {
 	//  "hwaddr" will convert a 6-byte string to a MAC address.
 	//  "ipaddr" will convert the value to an IPv4 or IPv6 address.
 	Conversion string
+	// Translate tells if the value of the field should be snmptranslated
+	Translate bool
 
 	initialized bool
 }
@@ -460,6 +462,17 @@ func (t Table) Build(gs snmpConnection, walk bool) (*RTable, error) {
 					}, idx)
 				}
 
+				// snmptranslate table field value here
+				if f.Translate {
+					if entOid, ok := ent.Value.(string); ok {
+						_, _, oidText, _, err := SnmpTranslate(entOid)
+						if err == nil {
+							// If no error translating, the original value for ent.Value should be replaced
+							ent.Value = oidText
+						}
+					}
+				}
+
 				fv, err := fieldConvert(f.Conversion, ent.Value)
 				if err != nil {
 					return &walkError{

plugins/inputs/snmp/snmp_mocks_generate.go

@@ -23,6 +23,7 @@ var mockedCommands = [][]string{
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.0.0.0.1.1.0"},
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.0.0.0.1.5"},
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.2.3"},
+	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.0.0.0.1.7"},
 	{"snmptranslate", "-Td", "-Ob", ".iso.2.3"},
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".999"},
 	{"snmptranslate", "-Td", "-Ob", "TEST::server"},

plugins/inputs/snmp/snmp_mocks_test.go

@@ -69,6 +69,7 @@ var mockedCommandResults = map[string]mockedCommandResult{
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.0.0.0.1.1.0":              {stdout: "TEST::server.0\nserver OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) server(1) 0 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.0.0.0.1.5":                {stdout: "TEST::testTableEntry.5\ntestTableEntry OBJECT-TYPE\n  -- FROM\tTEST\n  MAX-ACCESS\tnot-accessible\n  STATUS\tcurrent\n  INDEX\t\t{ server }\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) 5 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.2.3":                      {stdout: "iso.2.3\niso OBJECT-TYPE\n  -- FROM\t#-1\n::= { iso(1) 2 3 }\n", stderr: "", exitError: false},
+	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.0.0.0.1.7":                {stdout: "TEST::testTableEntry.7\ntestTableEntry OBJECT-TYPE\n  -- FROM\tTEST\n  MAX-ACCESS\tnot-accessible\n  STATUS\tcurrent\n  INDEX\t\t{ server }\n::= { iso(1) std(0) testOID(0) testTable(0) testTableEntry(1) 7 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00.iso.2.3":                                 {stdout: "iso.2.3\niso OBJECT-TYPE\n  -- FROM\t#-1\n::= { iso(1) 2 3 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.999":                        {stdout: ".999\n [TRUNCATED]\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00TEST::server":                             {stdout: "TEST::server\nserver OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) 1 }\n", stderr: "", exitError: false},

plugins/inputs/snmp/snmp_test.go

@@ -81,6 +81,7 @@ var tsc = &testSNMPConnection{
 		".1.0.0.1.3":         []byte("byte slice"),
 		".1.0.0.2.1.5.0.9.9": 11,
 		".1.0.0.2.1.5.1.9.9": 22,
+		".1.0.0.0.1.6.0":     ".1.0.0.0.1.7",
 	},
 }
 
@@ -493,6 +494,16 @@ func TestTableBuild_walk(t *testing.T) {
 				Oid:            ".1.0.0.2.1.5",
 				OidIndexLength: 1,
 			},
+			{
+				Name:      "myfield6",
+				Oid:       ".1.0.0.0.1.6",
+				Translate: true,
+			},
+			{
+				Name:      "myfield7",
+				Oid:       ".1.0.0.0.1.6",
+				Translate: false,
+			},
 		},
 	}
 
@@ -510,6 +521,8 @@ func TestTableBuild_walk(t *testing.T) {
 			"myfield3": float64(0.123),
 			"myfield4": 11,
 			"myfield5": 11,
+			"myfield6": "testTableEntry.7",
+			"myfield7": ".1.0.0.0.1.7",
 		},
 	}
 	rtr2 := RTableRow{