Fix precision truncation when no timestamp included (#3961)

metric/builder.go

@@ -10,6 +10,7 @@ type TimeFunc func() time.Time
 
 type Builder struct {
 	TimeFunc
+	TimePrecision time.Duration
 
 	*metric
 }
@@ -17,6 +18,7 @@ type Builder struct {
 func NewBuilder() *Builder {
 	b := &Builder{
 		TimeFunc:      time.Now,
+		TimePrecision: 1 * time.Nanosecond,
 	}
 	b.Reset()
 	return b
@@ -44,7 +46,7 @@ func (b *Builder) Reset() {
 
 func (b *Builder) Metric() (telegraf.Metric, error) {
 	if b.tm.IsZero() {
-		b.tm = b.TimeFunc()
+		b.tm = b.TimeFunc().Truncate(b.TimePrecision)
 	}
 
 	return b.metric, nil

plugins/inputs/http_listener/http_listener.go

@@ -33,6 +33,8 @@ const (
 	DEFAULT_MAX_LINE_SIZE = 64 * 1024
 )
 
+type TimeFunc func() time.Time
+
 type HTTPListener struct {
 	ServiceAddress string
 	ReadTimeout    internal.Duration
@@ -48,6 +50,8 @@ type HTTPListener struct {
 	BasicUsername string
 	BasicPassword string
 
+	TimeFunc
+
 	mu sync.Mutex
 	wg sync.WaitGroup
 
@@ -241,7 +245,7 @@ func (h *HTTPListener) serveWrite(res http.ResponseWriter, req *http.Request) {
 		tooLarge(res)
 		return
 	}
-	now := time.Now()
+	now := h.TimeFunc()
 
 	precision := req.URL.Query().Get("precision")
 
@@ -340,7 +344,8 @@ func (h *HTTPListener) serveWrite(res http.ResponseWriter, req *http.Request) {
 }
 
 func (h *HTTPListener) parse(b []byte, t time.Time, precision string) error {
-	h.handler.SetPrecision(getPrecisionMultiplier(precision))
+	h.handler.SetTimePrecision(getPrecisionMultiplier(precision))
+	h.handler.SetTimeFunc(func() time.Time { return t })
 	metrics, err := h.parser.Parse(b)
 	if err != nil {
 		return err
@@ -437,6 +442,7 @@ func init() {
 	inputs.Add("http_listener", func() telegraf.Input {
 		return &HTTPListener{
 			ServiceAddress: ":8186",
+			TimeFunc:       time.Now,
 		}
 	})
 }

plugins/parsers/influx/handler.go

@@ -26,8 +26,9 @@ func (h *MetricHandler) SetTimeFunc(f metric.TimeFunc) {
 	h.builder.TimeFunc = f
 }
 
-func (h *MetricHandler) SetPrecision(factor time.Duration) {
-	h.precision = factor
+func (h *MetricHandler) SetTimePrecision(precision time.Duration) {
+	h.builder.TimePrecision = precision
+	h.precision = precision
 }
 
 func (h *MetricHandler) Metric() (telegraf.Metric, error) {

plugins/parsers/influx/parser_test.go

@@ -23,6 +23,8 @@ var DefaultTime = func() time.Time {
 var ptests = []struct {
 	name      string
 	input     []byte
+	timeFunc  func() time.Time
+	precision time.Duration
 	metrics   []telegraf.Metric
 	err       error
 }{
@@ -406,7 +408,7 @@ var ptests = []struct {
 		err: nil,
 	},
 	{
-		name:  "default timestamp",
+		name:  "no timestamp",
 		input: []byte("cpu value=42"),
 		metrics: []telegraf.Metric{
 			Metric(
@@ -422,6 +424,47 @@ var ptests = []struct {
 		},
 		err: nil,
 	},
+	{
+		name:  "no timestamp full precision",
+		input: []byte("cpu value=42"),
+		timeFunc: func() time.Time {
+			return time.Unix(42, 123456789)
+		},
+		metrics: []telegraf.Metric{
+			Metric(
+				metric.New(
+					"cpu",
+					map[string]string{},
+					map[string]interface{}{
+						"value": 42.0,
+					},
+					time.Unix(42, 123456789),
+				),
+			),
+		},
+		err: nil,
+	},
+	{
+		name:  "no timestamp partial precision",
+		input: []byte("cpu value=42"),
+		timeFunc: func() time.Time {
+			return time.Unix(42, 123456789)
+		},
+		precision: 1 * time.Millisecond,
+		metrics: []telegraf.Metric{
+			Metric(
+				metric.New(
+					"cpu",
+					map[string]string{},
+					map[string]interface{}{
+						"value": 42.0,
+					},
+					time.Unix(42, 123000000),
+				),
+			),
+		},
+		err: nil,
+	},
 	{
 		name:  "multiple lines",
 		input: []byte("cpu value=42\ncpu value=42"),
@@ -538,6 +581,12 @@ func TestParser(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			handler := NewMetricHandler()
 			handler.SetTimeFunc(DefaultTime)
+			if tt.timeFunc != nil {
+				handler.SetTimeFunc(tt.timeFunc)
+			}
+			if tt.precision > 0 {
+				handler.SetTimePrecision(tt.precision)
+			}
 			parser := NewParser(handler)
 
 			metrics, err := parser.Parse(tt.input)