예제 #1
0
func TestProto3SetDefaults(t *testing.T) {
	in := &pb.Message{
		Terrain: map[string]*pb.Nested{
			"meadow": new(pb.Nested),
		},
		Proto2Field: new(tpb.SubDefaults),
		Proto2Value: map[string]*tpb.SubDefaults{
			"badlands": new(tpb.SubDefaults),
		},
	}

	got := proto.Clone(in).(*pb.Message)
	proto.SetDefaults(got)

	// There are no defaults in proto3.  Everything should be the zero value, but
	// we need to remember to set defaults for nested proto2 messages.
	want := &pb.Message{
		Terrain: map[string]*pb.Nested{
			"meadow": new(pb.Nested),
		},
		Proto2Field: &tpb.SubDefaults{N: proto.Int64(7)},
		Proto2Value: map[string]*tpb.SubDefaults{
			"badlands": &tpb.SubDefaults{N: proto.Int64(7)},
		},
	}

	if !proto.Equal(got, want) {
		t.Errorf("with in = %v\nproto.SetDefaults(in) =>\ngot %v\nwant %v", in, got, want)
	}
}
예제 #2
0
func newTestMessage() *pb.MyMessage {
	msg := &pb.MyMessage{
		Count: proto.Int32(42),
		Name:  proto.String("Dave"),
		Quote: proto.String(`"I didn't want to go."`),
		Pet:   []string{"bunny", "kitty", "horsey"},
		Inner: &pb.InnerMessage{
			Host:      proto.String("footrest.syd"),
			Port:      proto.Int32(7001),
			Connected: proto.Bool(true),
		},
		Others: []*pb.OtherMessage{
			{
				Key:   proto.Int64(0xdeadbeef),
				Value: []byte{1, 65, 7, 12},
			},
			{
				Weight: proto.Float32(6.022),
				Inner: &pb.InnerMessage{
					Host: proto.String("lesha.mtv"),
					Port: proto.Int32(8002),
				},
			},
		},
		Bikeshed: pb.MyMessage_BLUE.Enum(),
		Somegroup: &pb.MyMessage_SomeGroup{
			GroupField: proto.Int32(8),
		},
		// One normally wouldn't do this.
		// This is an undeclared tag 13, as a varint (wire type 0) with value 4.
		XXX_unrecognized: []byte{13<<3 | 0, 4},
	}
	ext := &pb.Ext{
		Data: proto.String("Big gobs for big rats"),
	}
	if err := proto.SetExtension(msg, pb.E_Ext_More, ext); err != nil {
		panic(err)
	}
	greetings := []string{"adg", "easy", "cow"}
	if err := proto.SetExtension(msg, pb.E_Greeting, greetings); err != nil {
		panic(err)
	}

	// Add an unknown extension. We marshal a pb.Ext, and fake the ID.
	b, err := proto.Marshal(&pb.Ext{Data: proto.String("3G skiing")})
	if err != nil {
		panic(err)
	}
	b = append(proto.EncodeVarint(201<<3|proto.WireBytes), b...)
	proto.SetRawExtension(msg, 201, b)

	// Extensions can be plain fields, too, so let's test that.
	b = append(proto.EncodeVarint(202<<3|proto.WireVarint), 19)
	proto.SetRawExtension(msg, 202, b)

	return msg
}
예제 #3
0
// startTimestamp represents the state where the next byte read from p.buf is
// the start of the timestamp (or whitespace leading up to it).
func (p *Parser) startTimestamp() stateFn {
	if p.skipBlankTab(); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.readTokenUntilWhitespace(); p.err != nil {
		return nil // Unexpected end of input.
	}
	timestamp, err := strconv.ParseInt(p.currentToken.String(), 10, 64)
	if err != nil {
		// Create a more helpful error message.
		p.parseError(fmt.Sprintf("expected integer as timestamp, got %q", p.currentToken.String()))
		return nil
	}
	p.currentMetric.TimestampMs = proto.Int64(timestamp)
	if p.readTokenUntilNewline(false); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.currentToken.Len() > 0 {
		p.parseError(fmt.Sprintf("spurious string after timestamp: %q", p.currentToken.String()))
		return nil
	}
	return p.startOfLine
}
예제 #4
0
			Pet: []string{"horsey"},
			Others: []*pb.OtherMessage{
				{
					Value: []byte("some bytes"),
				},
			},
		},
		dst: &pb.MyMessage{
			Inner: &pb.InnerMessage{
				Host: proto.String("niles"),
				Port: proto.Int32(9099),
			},
			Pet: []string{"bunny", "kitty"},
			Others: []*pb.OtherMessage{
				{
					Key: proto.Int64(31415926535),
				},
				{
					// Explicitly test a src=nil field
					Inner: nil,
				},
			},
		},
		want: &pb.MyMessage{
			Inner: &pb.InnerMessage{
				Host:      proto.String("hey"),
				Connected: proto.Bool(true),
				Port:      proto.Int32(9099),
			},
			Pet: []string{"bunny", "kitty", "horsey"},
			Others: []*pb.OtherMessage{
예제 #5
0
func testParse(t testing.TB) {
	var scenarios = []struct {
		in  string
		out []*dto.MetricFamily
	}{
		// 0: Empty lines as input.
		{
			in: `

`,
			out: []*dto.MetricFamily{},
		},
		// 1: Minimal case.
		{
			in: `
minimal_metric 1.234
another_metric -3e3 103948
# Even that:
no_labels{} 3
# HELP line for non-existing metric will be ignored.
`,
			out: []*dto.MetricFamily{
				&dto.MetricFamily{
					Name: proto.String("minimal_metric"),
					Type: dto.MetricType_UNTYPED.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Untyped: &dto.Untyped{
								Value: proto.Float64(1.234),
							},
						},
					},
				},
				&dto.MetricFamily{
					Name: proto.String("another_metric"),
					Type: dto.MetricType_UNTYPED.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Untyped: &dto.Untyped{
								Value: proto.Float64(-3e3),
							},
							TimestampMs: proto.Int64(103948),
						},
					},
				},
				&dto.MetricFamily{
					Name: proto.String("no_labels"),
					Type: dto.MetricType_UNTYPED.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Untyped: &dto.Untyped{
								Value: proto.Float64(3),
							},
						},
					},
				},
			},
		},
		// 2: Counters & gauges, docstrings, various whitespace, escape sequences.
		{
			in: `
# A normal comment.
#
# TYPE name counter
name{labelname="val1",basename="basevalue"} NaN
name {labelname="val2",basename="base\"v\\al\nue"} 0.23 1234567890
# HELP name two-line\n doc  str\\ing

 # HELP  name2  	doc str"ing 2
  #    TYPE    name2 gauge
name2{labelname="val2"	,basename   =   "basevalue2"		} +Inf 54321
name2{ labelname = "val1" , }-Inf
`,
			out: []*dto.MetricFamily{
				&dto.MetricFamily{
					Name: proto.String("name"),
					Help: proto.String("two-line\n doc  str\\ing"),
					Type: dto.MetricType_COUNTER.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("labelname"),
									Value: proto.String("val1"),
								},
								&dto.LabelPair{
									Name:  proto.String("basename"),
									Value: proto.String("basevalue"),
								},
							},
							Counter: &dto.Counter{
								Value: proto.Float64(math.NaN()),
							},
						},
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("labelname"),
									Value: proto.String("val2"),
								},
								&dto.LabelPair{
									Name:  proto.String("basename"),
									Value: proto.String("base\"v\\al\nue"),
								},
							},
							Counter: &dto.Counter{
								Value: proto.Float64(.23),
							},
							TimestampMs: proto.Int64(1234567890),
						},
					},
				},
				&dto.MetricFamily{
					Name: proto.String("name2"),
					Help: proto.String("doc str\"ing 2"),
					Type: dto.MetricType_GAUGE.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("labelname"),
									Value: proto.String("val2"),
								},
								&dto.LabelPair{
									Name:  proto.String("basename"),
									Value: proto.String("basevalue2"),
								},
							},
							Gauge: &dto.Gauge{
								Value: proto.Float64(math.Inf(+1)),
							},
							TimestampMs: proto.Int64(54321),
						},
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("labelname"),
									Value: proto.String("val1"),
								},
							},
							Gauge: &dto.Gauge{
								Value: proto.Float64(math.Inf(-1)),
							},
						},
					},
				},
			},
		},
		// 3: The evil summary, mixed with other types and funny comments.
		{
			in: `
# TYPE my_summary summary
my_summary{n1="val1",quantile="0.5"} 110
decoy -1 -2
my_summary{n1="val1",quantile="0.9"} 140 1
my_summary_count{n1="val1"} 42
# Latest timestamp wins in case of a summary.
my_summary_sum{n1="val1"} 4711 2
fake_sum{n1="val1"} 2001
# TYPE another_summary summary
another_summary_count{n2="val2",n1="val1"} 20
my_summary_count{n2="val2",n1="val1"} 5 5
another_summary{n1="val1",n2="val2",quantile=".3"} -1.2
my_summary_sum{n1="val2"} 08 15
my_summary{n1="val3", quantile="0.2"} 4711
  my_summary{n1="val1",n2="val2",quantile="-12.34",} NaN
# some
# funny comments
# HELP 
# HELP
# HELP my_summary
# HELP my_summary 
`,
			out: []*dto.MetricFamily{
				&dto.MetricFamily{
					Name: proto.String("fake_sum"),
					Type: dto.MetricType_UNTYPED.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("n1"),
									Value: proto.String("val1"),
								},
							},
							Untyped: &dto.Untyped{
								Value: proto.Float64(2001),
							},
						},
					},
				},
				&dto.MetricFamily{
					Name: proto.String("decoy"),
					Type: dto.MetricType_UNTYPED.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Untyped: &dto.Untyped{
								Value: proto.Float64(-1),
							},
							TimestampMs: proto.Int64(-2),
						},
					},
				},
				&dto.MetricFamily{
					Name: proto.String("my_summary"),
					Type: dto.MetricType_SUMMARY.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("n1"),
									Value: proto.String("val1"),
								},
							},
							Summary: &dto.Summary{
								SampleCount: proto.Uint64(42),
								SampleSum:   proto.Float64(4711),
								Quantile: []*dto.Quantile{
									&dto.Quantile{
										Quantile: proto.Float64(0.5),
										Value:    proto.Float64(110),
									},
									&dto.Quantile{
										Quantile: proto.Float64(0.9),
										Value:    proto.Float64(140),
									},
								},
							},
							TimestampMs: proto.Int64(2),
						},
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("n2"),
									Value: proto.String("val2"),
								},
								&dto.LabelPair{
									Name:  proto.String("n1"),
									Value: proto.String("val1"),
								},
							},
							Summary: &dto.Summary{
								SampleCount: proto.Uint64(5),
								Quantile: []*dto.Quantile{
									&dto.Quantile{
										Quantile: proto.Float64(-12.34),
										Value:    proto.Float64(math.NaN()),
									},
								},
							},
							TimestampMs: proto.Int64(5),
						},
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("n1"),
									Value: proto.String("val2"),
								},
							},
							Summary: &dto.Summary{
								SampleSum: proto.Float64(8),
							},
							TimestampMs: proto.Int64(15),
						},
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("n1"),
									Value: proto.String("val3"),
								},
							},
							Summary: &dto.Summary{
								Quantile: []*dto.Quantile{
									&dto.Quantile{
										Quantile: proto.Float64(0.2),
										Value:    proto.Float64(4711),
									},
								},
							},
						},
					},
				},
				&dto.MetricFamily{
					Name: proto.String("another_summary"),
					Type: dto.MetricType_SUMMARY.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Label: []*dto.LabelPair{
								&dto.LabelPair{
									Name:  proto.String("n2"),
									Value: proto.String("val2"),
								},
								&dto.LabelPair{
									Name:  proto.String("n1"),
									Value: proto.String("val1"),
								},
							},
							Summary: &dto.Summary{
								SampleCount: proto.Uint64(20),
								Quantile: []*dto.Quantile{
									&dto.Quantile{
										Quantile: proto.Float64(0.3),
										Value:    proto.Float64(-1.2),
									},
								},
							},
						},
					},
				},
			},
		},
		// 4: The histogram.
		{
			in: `
# HELP request_duration_microseconds The response latency.
# TYPE request_duration_microseconds histogram
request_duration_microseconds_bucket{le="100"} 123
request_duration_microseconds_bucket{le="120"} 412
request_duration_microseconds_bucket{le="144"} 592
request_duration_microseconds_bucket{le="172.8"} 1524
request_duration_microseconds_bucket{le="+Inf"} 2693
request_duration_microseconds_sum 1.7560473e+06
request_duration_microseconds_count 2693
`,
			out: []*dto.MetricFamily{
				{
					Name: proto.String("request_duration_microseconds"),
					Help: proto.String("The response latency."),
					Type: dto.MetricType_HISTOGRAM.Enum(),
					Metric: []*dto.Metric{
						&dto.Metric{
							Histogram: &dto.Histogram{
								SampleCount: proto.Uint64(2693),
								SampleSum:   proto.Float64(1756047.3),
								Bucket: []*dto.Bucket{
									&dto.Bucket{
										UpperBound:      proto.Float64(100),
										CumulativeCount: proto.Uint64(123),
									},
									&dto.Bucket{
										UpperBound:      proto.Float64(120),
										CumulativeCount: proto.Uint64(412),
									},
									&dto.Bucket{
										UpperBound:      proto.Float64(144),
										CumulativeCount: proto.Uint64(592),
									},
									&dto.Bucket{
										UpperBound:      proto.Float64(172.8),
										CumulativeCount: proto.Uint64(1524),
									},
									&dto.Bucket{
										UpperBound:      proto.Float64(math.Inf(+1)),
										CumulativeCount: proto.Uint64(2693),
									},
								},
							},
						},
					},
				},
			},
		},
	}

	for i, scenario := range scenarios {
		out, err := parser.TextToMetricFamilies(strings.NewReader(scenario.in))
		if err != nil {
			t.Errorf("%d. error: %s", i, err)
			continue
		}
		if expected, got := len(scenario.out), len(out); expected != got {
			t.Errorf(
				"%d. expected %d MetricFamilies, got %d",
				i, expected, got,
			)
		}
		for _, expected := range scenario.out {
			got, ok := out[expected.GetName()]
			if !ok {
				t.Errorf(
					"%d. expected MetricFamily %q, found none",
					i, expected.GetName(),
				)
				continue
			}
			if expected.String() != got.String() {
				t.Errorf(
					"%d. expected MetricFamily %s, got %s",
					i, expected, got,
				)
			}
		}
	}
}
예제 #6
0
func testCreate(t testing.TB) {
	var scenarios = []struct {
		in  *dto.MetricFamily
		out string
	}{
		// 0: Counter, NaN as value, timestamp given.
		{
			in: &dto.MetricFamily{
				Name: proto.String("name"),
				Help: proto.String("two-line\n doc  str\\ing"),
				Type: dto.MetricType_COUNTER.Enum(),
				Metric: []*dto.Metric{
					&dto.Metric{
						Label: []*dto.LabelPair{
							&dto.LabelPair{
								Name:  proto.String("labelname"),
								Value: proto.String("val1"),
							},
							&dto.LabelPair{
								Name:  proto.String("basename"),
								Value: proto.String("basevalue"),
							},
						},
						Counter: &dto.Counter{
							Value: proto.Float64(math.NaN()),
						},
					},
					&dto.Metric{
						Label: []*dto.LabelPair{
							&dto.LabelPair{
								Name:  proto.String("labelname"),
								Value: proto.String("val2"),
							},
							&dto.LabelPair{
								Name:  proto.String("basename"),
								Value: proto.String("basevalue"),
							},
						},
						Counter: &dto.Counter{
							Value: proto.Float64(.23),
						},
						TimestampMs: proto.Int64(1234567890),
					},
				},
			},
			out: `# HELP name two-line\n doc  str\\ing
# TYPE name counter
name{labelname="val1",basename="basevalue"} NaN
name{labelname="val2",basename="basevalue"} 0.23 1234567890
`,
		},
		// 1: Gauge, some escaping required, +Inf as value, multi-byte characters in label values.
		{
			in: &dto.MetricFamily{
				Name: proto.String("gauge_name"),
				Help: proto.String("gauge\ndoc\nstr\"ing"),
				Type: dto.MetricType_GAUGE.Enum(),
				Metric: []*dto.Metric{
					&dto.Metric{
						Label: []*dto.LabelPair{
							&dto.LabelPair{
								Name:  proto.String("name_1"),
								Value: proto.String("val with\nnew line"),
							},
							&dto.LabelPair{
								Name:  proto.String("name_2"),
								Value: proto.String("val with \\backslash and \"quotes\""),
							},
						},
						Gauge: &dto.Gauge{
							Value: proto.Float64(math.Inf(+1)),
						},
					},
					&dto.Metric{
						Label: []*dto.LabelPair{
							&dto.LabelPair{
								Name:  proto.String("name_1"),
								Value: proto.String("Björn"),
							},
							&dto.LabelPair{
								Name:  proto.String("name_2"),
								Value: proto.String("佖佥"),
							},
						},
						Gauge: &dto.Gauge{
							Value: proto.Float64(3.14E42),
						},
					},
				},
			},
			out: `# HELP gauge_name gauge\ndoc\nstr"ing
# TYPE gauge_name gauge
gauge_name{name_1="val with\nnew line",name_2="val with \\backslash and \"quotes\""} +Inf
gauge_name{name_1="Björn",name_2="佖佥"} 3.14e+42
`,
		},
		// 2: Untyped, no help, one sample with no labels and -Inf as value, another sample with one label.
		{
			in: &dto.MetricFamily{
				Name: proto.String("untyped_name"),
				Type: dto.MetricType_UNTYPED.Enum(),
				Metric: []*dto.Metric{
					&dto.Metric{
						Untyped: &dto.Untyped{
							Value: proto.Float64(math.Inf(-1)),
						},
					},
					&dto.Metric{
						Label: []*dto.LabelPair{
							&dto.LabelPair{
								Name:  proto.String("name_1"),
								Value: proto.String("value 1"),
							},
						},
						Untyped: &dto.Untyped{
							Value: proto.Float64(-1.23e-45),
						},
					},
				},
			},
			out: `# TYPE untyped_name untyped
untyped_name -Inf
untyped_name{name_1="value 1"} -1.23e-45
`,
		},
		// 3: Summary.
		{
			in: &dto.MetricFamily{
				Name: proto.String("summary_name"),
				Help: proto.String("summary docstring"),
				Type: dto.MetricType_SUMMARY.Enum(),
				Metric: []*dto.Metric{
					&dto.Metric{
						Summary: &dto.Summary{
							SampleCount: proto.Uint64(42),
							SampleSum:   proto.Float64(-3.4567),
							Quantile: []*dto.Quantile{
								&dto.Quantile{
									Quantile: proto.Float64(0.5),
									Value:    proto.Float64(-1.23),
								},
								&dto.Quantile{
									Quantile: proto.Float64(0.9),
									Value:    proto.Float64(.2342354),
								},
								&dto.Quantile{
									Quantile: proto.Float64(0.99),
									Value:    proto.Float64(0),
								},
							},
						},
					},
					&dto.Metric{
						Label: []*dto.LabelPair{
							&dto.LabelPair{
								Name:  proto.String("name_1"),
								Value: proto.String("value 1"),
							},
							&dto.LabelPair{
								Name:  proto.String("name_2"),
								Value: proto.String("value 2"),
							},
						},
						Summary: &dto.Summary{
							SampleCount: proto.Uint64(4711),
							SampleSum:   proto.Float64(2010.1971),
							Quantile: []*dto.Quantile{
								&dto.Quantile{
									Quantile: proto.Float64(0.5),
									Value:    proto.Float64(1),
								},
								&dto.Quantile{
									Quantile: proto.Float64(0.9),
									Value:    proto.Float64(2),
								},
								&dto.Quantile{
									Quantile: proto.Float64(0.99),
									Value:    proto.Float64(3),
								},
							},
						},
					},
				},
			},
			out: `# HELP summary_name summary docstring
# TYPE summary_name summary
summary_name{quantile="0.5"} -1.23
summary_name{quantile="0.9"} 0.2342354
summary_name{quantile="0.99"} 0
summary_name_sum -3.4567
summary_name_count 42
summary_name{name_1="value 1",name_2="value 2",quantile="0.5"} 1
summary_name{name_1="value 1",name_2="value 2",quantile="0.9"} 2
summary_name{name_1="value 1",name_2="value 2",quantile="0.99"} 3
summary_name_sum{name_1="value 1",name_2="value 2"} 2010.1971
summary_name_count{name_1="value 1",name_2="value 2"} 4711
`,
		},
		// 4: Histogram
		{
			in: &dto.MetricFamily{
				Name: proto.String("request_duration_microseconds"),
				Help: proto.String("The response latency."),
				Type: dto.MetricType_HISTOGRAM.Enum(),
				Metric: []*dto.Metric{
					&dto.Metric{
						Histogram: &dto.Histogram{
							SampleCount: proto.Uint64(2693),
							SampleSum:   proto.Float64(1756047.3),
							Bucket: []*dto.Bucket{
								&dto.Bucket{
									UpperBound:      proto.Float64(100),
									CumulativeCount: proto.Uint64(123),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(120),
									CumulativeCount: proto.Uint64(412),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(144),
									CumulativeCount: proto.Uint64(592),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(172.8),
									CumulativeCount: proto.Uint64(1524),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(math.Inf(+1)),
									CumulativeCount: proto.Uint64(2693),
								},
							},
						},
					},
				},
			},
			out: `# HELP request_duration_microseconds The response latency.
# TYPE request_duration_microseconds histogram
request_duration_microseconds_bucket{le="100"} 123
request_duration_microseconds_bucket{le="120"} 412
request_duration_microseconds_bucket{le="144"} 592
request_duration_microseconds_bucket{le="172.8"} 1524
request_duration_microseconds_bucket{le="+Inf"} 2693
request_duration_microseconds_sum 1.7560473e+06
request_duration_microseconds_count 2693
`,
		},
		// 5: Histogram with missing +Inf bucket.
		{
			in: &dto.MetricFamily{
				Name: proto.String("request_duration_microseconds"),
				Help: proto.String("The response latency."),
				Type: dto.MetricType_HISTOGRAM.Enum(),
				Metric: []*dto.Metric{
					&dto.Metric{
						Histogram: &dto.Histogram{
							SampleCount: proto.Uint64(2693),
							SampleSum:   proto.Float64(1756047.3),
							Bucket: []*dto.Bucket{
								&dto.Bucket{
									UpperBound:      proto.Float64(100),
									CumulativeCount: proto.Uint64(123),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(120),
									CumulativeCount: proto.Uint64(412),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(144),
									CumulativeCount: proto.Uint64(592),
								},
								&dto.Bucket{
									UpperBound:      proto.Float64(172.8),
									CumulativeCount: proto.Uint64(1524),
								},
							},
						},
					},
				},
			},
			out: `# HELP request_duration_microseconds The response latency.
# TYPE request_duration_microseconds histogram
request_duration_microseconds_bucket{le="100"} 123
request_duration_microseconds_bucket{le="120"} 412
request_duration_microseconds_bucket{le="144"} 592
request_duration_microseconds_bucket{le="172.8"} 1524
request_duration_microseconds_bucket{le="+Inf"} 2693
request_duration_microseconds_sum 1.7560473e+06
request_duration_microseconds_count 2693
`,
		},
	}

	for i, scenario := range scenarios {
		out := bytes.NewBuffer(make([]byte, 0, len(scenario.out)))
		n, err := MetricFamilyToText(out, scenario.in)
		if err != nil {
			t.Errorf("%d. error: %s", i, err)
			continue
		}
		if expected, got := len(scenario.out), n; expected != got {
			t.Errorf(
				"%d. expected %d bytes written, got %d",
				i, expected, got,
			)
		}
		if expected, got := scenario.out, out.String(); expected != got {
			t.Errorf(
				"%d. expected out=%q, got %q",
				i, expected, got,
			)
		}
	}

}