metric: Fix negative number handling

closes #2324

plugins/inputs/mqtt_consumer/mqtt_consumer_test.go

@@ -14,6 +14,7 @@ import (
 
 const (
 	testMsg         = "cpu_load_short,host=server01 value=23422.0 1422568543702900257\n"
+	testMsgNeg      = "cpu_load_short,host=server01 value=-23422.0 1422568543702900257\n"
 	testMsgGraphite = "cpu.load.short.graphite 23422 1454780029"
 	testMsgJSON     = "{\"a\": 5, \"b\": {\"c\": 6}}\n"
 	invalidMsg      = "cpu_load_short,host=server01 1422568543702900257\n"
@@ -76,13 +77,28 @@ func TestPersistentClientIDFail(t *testing.T) {
 	assert.Error(t, err)
 }
 
-// Test that the parser parses NATS messages into metrics
 func TestRunParser(t *testing.T) {
 	n, in := newTestMQTTConsumer()
 	acc := testutil.Accumulator{}
 	n.acc = &acc
 	defer close(n.done)
 
+	n.parser, _ = parsers.NewInfluxParser()
+	go n.receiver()
+	in <- mqttMsg(testMsgNeg)
+	time.Sleep(time.Millisecond * 250)
+
+	if a := acc.NFields(); a != 1 {
+		t.Errorf("got %v, expected %v", a, 1)
+	}
+}
+
+func TestRunParserNegativeNumber(t *testing.T) {
+	n, in := newTestMQTTConsumer()
+	acc := testutil.Accumulator{}
+	n.acc = &acc
+	defer close(n.done)
+
 	n.parser, _ = parsers.NewInfluxParser()
 	go n.receiver()
 	in <- mqttMsg(testMsg)

plugins/parsers/influx/parser_test.go

@@ -19,6 +19,7 @@ var (
 
 const (
 	validInflux          = "cpu_load_short,cpu=cpu0 value=10 1257894000000000000\n"
+	negativeFloat        = "cpu_load_short,cpu=cpu0 value=-13.4 1257894000000000000\n"
 	validInfluxNewline   = "\ncpu_load_short,cpu=cpu0 value=10 1257894000000000000\n"
 	validInfluxNoNewline = "cpu_load_short,cpu=cpu0 value=10 1257894000000000000"
 	invalidInflux        = "I don't think this is line protocol\n"
@@ -82,6 +83,18 @@ func TestParseValidInflux(t *testing.T) {
 		"cpu": "cpu0",
 	}, metrics[0].Tags())
 	assert.Equal(t, exptime, metrics[0].Time().UnixNano())
+
+	metrics, err = parser.Parse([]byte(negativeFloat))
+	assert.NoError(t, err)
+	assert.Len(t, metrics, 1)
+	assert.Equal(t, "cpu_load_short", metrics[0].Name())
+	assert.Equal(t, map[string]interface{}{
+		"value": float64(-13.4),
+	}, metrics[0].Fields())
+	assert.Equal(t, map[string]string{
+		"cpu": "cpu0",
+	}, metrics[0].Tags())
+	assert.Equal(t, exptime, metrics[0].Time().UnixNano())
 }
 
 func TestParseLineValidInflux(t *testing.T) {