func (s *summary) Write(out *dto.Metric) error {
sum := &dto.Summary{}
qs := make([]*dto.Quantile, 0, len(s.objectives))
s.bufMtx.Lock()
s.mtx.Lock()
if len(s.hotBuf) != 0 {
s.swapBufs(time.Now())
}
s.bufMtx.Unlock()
s.flushColdBuf()
sum.SampleCount = proto.Uint64(s.cnt)
sum.SampleSum = proto.Float64(s.sum)
for _, rank := range s.sortedObjectives {
qs = append(qs, &dto.Quantile{
Quantile: proto.Float64(rank),
Value: proto.Float64(s.headStream.Query(rank)),
})
}
s.mtx.Unlock()
if len(qs) > 0 {
sort.Sort(quantSort(qs))
}
sum.Quantile = qs
out.Summary = sum
out.Label = s.labelPairs
return nil
}
func populateMetric(
t ValueType,
v float64,
labelPairs []*dto.LabelPair,
m *dto.Metric,
) error {
m.Label = labelPairs
switch t {
case CounterValue:
m.Counter = &dto.Counter{Value: proto.Float64(v)}
case GaugeValue:
m.Gauge = &dto.Gauge{Value: proto.Float64(v)}
case UntypedValue:
m.Untyped = &dto.Untyped{Value: proto.Float64(v)}
default:
return fmt.Errorf("encountered unknown type %v", t)
}
return nil
}
// readingValue represents the state where the last byte read (now in
// p.currentByte) is the first byte of the sample value (i.e. a float).
func (p *Parser) readingValue() stateFn {
// When we are here, we have read all the labels, so for the
// special case of a summary/histogram, we can finally find out
// if the metric already exists.
if p.currentMF.GetType() == dto.MetricType_SUMMARY {
signature := model.LabelsToSignature(p.currentLabels)
if summary := p.summaries[signature]; summary != nil {
p.currentMetric = summary
} else {
p.summaries[signature] = p.currentMetric
p.currentMF.Metric = append(p.currentMF.Metric, p.currentMetric)
}
} else if p.currentMF.GetType() == dto.MetricType_HISTOGRAM {
signature := model.LabelsToSignature(p.currentLabels)
if histogram := p.histograms[signature]; histogram != nil {
p.currentMetric = histogram
} else {
p.histograms[signature] = p.currentMetric
p.currentMF.Metric = append(p.currentMF.Metric, p.currentMetric)
}
} else {
p.currentMF.Metric = append(p.currentMF.Metric, p.currentMetric)
}
if p.readTokenUntilWhitespace(); p.err != nil {
return nil // Unexpected end of input.
}
value, err := strconv.ParseFloat(p.currentToken.String(), 64)
if err != nil {
// Create a more helpful error message.
p.parseError(fmt.Sprintf("expected float as value, got %q", p.currentToken.String()))
return nil
}
switch p.currentMF.GetType() {
case dto.MetricType_COUNTER:
p.currentMetric.Counter = &dto.Counter{Value: proto.Float64(value)}
case dto.MetricType_GAUGE:
p.currentMetric.Gauge = &dto.Gauge{Value: proto.Float64(value)}
case dto.MetricType_UNTYPED:
p.currentMetric.Untyped = &dto.Untyped{Value: proto.Float64(value)}
case dto.MetricType_SUMMARY:
// *sigh*
if p.currentMetric.Summary == nil {
p.currentMetric.Summary = &dto.Summary{}
}
switch {
case p.currentIsSummaryCount:
p.currentMetric.Summary.SampleCount = proto.Uint64(uint64(value))
case p.currentIsSummarySum:
p.currentMetric.Summary.SampleSum = proto.Float64(value)
case !math.IsNaN(p.currentQuantile):
p.currentMetric.Summary.Quantile = append(
p.currentMetric.Summary.Quantile,
&dto.Quantile{
Quantile: proto.Float64(p.currentQuantile),
Value: proto.Float64(value),
},
)
}
case dto.MetricType_HISTOGRAM:
// *sigh*
if p.currentMetric.Histogram == nil {
p.currentMetric.Histogram = &dto.Histogram{}
}
switch {
case p.currentIsHistogramCount:
p.currentMetric.Histogram.SampleCount = proto.Uint64(uint64(value))
case p.currentIsHistogramSum:
p.currentMetric.Histogram.SampleSum = proto.Float64(value)
case !math.IsNaN(p.currentBucket):
p.currentMetric.Histogram.Bucket = append(
p.currentMetric.Histogram.Bucket,
&dto.Bucket{
UpperBound: proto.Float64(p.currentBucket),
CumulativeCount: proto.Uint64(uint64(value)),
},
)
}
default:
p.err = fmt.Errorf("unexpected type for metric name %q", p.currentMF.GetName())
}
if p.currentByte == '\n' {
return p.startOfLine
}
return p.startTimestamp
}
func (cm *CallbackMetric) Write(m *dto.Metric) error {
m.Untyped = &dto.Untyped{Value: proto.Float64(cm.callback())}
return nil
}
func testCreateError(t testing.TB) {
var scenarios = []struct {
in *dto.MetricFamily
err string
}{
// 0: No metric.
{
in: &dto.MetricFamily{
Name: proto.String("name"),
Help: proto.String("doc string"),
Type: dto.MetricType_COUNTER.Enum(),
Metric: []*dto.Metric{},
},
err: "MetricFamily has no metrics",
},
// 1: No metric name.
{
in: &dto.MetricFamily{
Help: proto.String("doc string"),
Type: dto.MetricType_UNTYPED.Enum(),
Metric: []*dto.Metric{
&dto.Metric{
Untyped: &dto.Untyped{
Value: proto.Float64(math.Inf(-1)),
},
},
},
},
err: "MetricFamily has no name",
},
// 2: No metric type.
{
in: &dto.MetricFamily{
Name: proto.String("name"),
Help: proto.String("doc string"),
Metric: []*dto.Metric{
&dto.Metric{
Untyped: &dto.Untyped{
Value: proto.Float64(math.Inf(-1)),
},
},
},
},
err: "MetricFamily has no type",
},
// 3: Wrong type.
{
in: &dto.MetricFamily{
Name: proto.String("name"),
Help: proto.String("doc string"),
Type: dto.MetricType_COUNTER.Enum(),
Metric: []*dto.Metric{
&dto.Metric{
Untyped: &dto.Untyped{
Value: proto.Float64(math.Inf(-1)),
},
},
},
},
err: "expected counter in metric",
},
}
for i, scenario := range scenarios {
var out bytes.Buffer
_, err := MetricFamilyToText(&out, scenario.in)
if err == nil {
t.Errorf("%d. expected error, got nil", i)
continue
}
if expected, got := scenario.err, err.Error(); strings.Index(got, expected) != 0 {
t.Errorf(
"%d. expected error starting with %q, got %q",
i, expected, got,
)
}
}
}
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
`,
},
}
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,
)
}
}
}
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,
)
}
}
}
}
func testHandler(t testing.TB) {
metricVec := NewCounterVec(
CounterOpts{
Name: "name",
Help: "docstring",
ConstLabels: Labels{"constname": "constvalue"},
},
[]string{"labelname"},
)
metricVec.WithLabelValues("val1").Inc()
metricVec.WithLabelValues("val2").Inc()
varintBuf := make([]byte, binary.MaxVarintLen32)
externalMetricFamily := []*dto.MetricFamily{
{
Name: proto.String("externalname"),
Help: proto.String("externaldocstring"),
Type: dto.MetricType_COUNTER.Enum(),
Metric: []*dto.Metric{
{
Label: []*dto.LabelPair{
{
Name: proto.String("externallabelname"),
Value: proto.String("externalval1"),
},
{
Name: proto.String("externalconstname"),
Value: proto.String("externalconstvalue"),
},
},
Counter: &dto.Counter{
Value: proto.Float64(1),
},
},
},
},
}
marshaledExternalMetricFamily, err := proto.Marshal(externalMetricFamily[0])
if err != nil {
t.Fatal(err)
}
var externalBuf bytes.Buffer
l := binary.PutUvarint(varintBuf, uint64(len(marshaledExternalMetricFamily)))
_, err = externalBuf.Write(varintBuf[:l])
if err != nil {
t.Fatal(err)
}
_, err = externalBuf.Write(marshaledExternalMetricFamily)
if err != nil {
t.Fatal(err)
}
externalMetricFamilyAsBytes := externalBuf.Bytes()
externalMetricFamilyAsText := []byte(`# HELP externalname externaldocstring
# TYPE externalname counter
externalname{externallabelname="externalval1",externalconstname="externalconstvalue"} 1
`)
externalMetricFamilyAsProtoText := []byte(`name: "externalname"
help: "externaldocstring"
type: COUNTER
metric: <
label: <
name: "externallabelname"
value: "externalval1"
>
label: <
name: "externalconstname"
value: "externalconstvalue"
>
counter: <
value: 1
>
>
`)
externalMetricFamilyAsProtoCompactText := []byte(`name:"externalname" help:"externaldocstring" type:COUNTER metric:<label:<name:"externallabelname" value:"externalval1" > label:<name:"externalconstname" value:"externalconstvalue" > counter:<value:1 > >
`)
expectedMetricFamily := &dto.MetricFamily{
Name: proto.String("name"),
Help: proto.String("docstring"),
Type: dto.MetricType_COUNTER.Enum(),
Metric: []*dto.Metric{
{
Label: []*dto.LabelPair{
{
Name: proto.String("constname"),
Value: proto.String("constvalue"),
},
{
Name: proto.String("labelname"),
Value: proto.String("val1"),
},
},
Counter: &dto.Counter{
Value: proto.Float64(1),
},
},
{
Label: []*dto.LabelPair{
{
Name: proto.String("constname"),
Value: proto.String("constvalue"),
},
{
Name: proto.String("labelname"),
Value: proto.String("val2"),
},
},
Counter: &dto.Counter{
Value: proto.Float64(1),
},
},
},
}
marshaledExpectedMetricFamily, err := proto.Marshal(expectedMetricFamily)
if err != nil {
t.Fatal(err)
}
var buf bytes.Buffer
l = binary.PutUvarint(varintBuf, uint64(len(marshaledExpectedMetricFamily)))
_, err = buf.Write(varintBuf[:l])
if err != nil {
t.Fatal(err)
}
_, err = buf.Write(marshaledExpectedMetricFamily)
if err != nil {
t.Fatal(err)
}
expectedMetricFamilyAsBytes := buf.Bytes()
expectedMetricFamilyAsText := []byte(`# HELP name docstring
# TYPE name counter
name{constname="constvalue",labelname="val1"} 1
name{constname="constvalue",labelname="val2"} 1
`)
expectedMetricFamilyAsProtoText := []byte(`name: "name"
help: "docstring"
type: COUNTER
metric: <
label: <
name: "constname"
value: "constvalue"
>
label: <
name: "labelname"
value: "val1"
>
counter: <
value: 1
>
>
metric: <
label: <
name: "constname"
value: "constvalue"
>
label: <
name: "labelname"
value: "val2"
>
counter: <
value: 1
>
>
`)
expectedMetricFamilyAsProtoCompactText := []byte(`name:"name" help:"docstring" type:COUNTER metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"val1" > counter:<value:1 > > metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"val2" > counter:<value:1 > >
`)
type output struct {
headers map[string]string
body []byte
}
var scenarios = []struct {
headers map[string]string
out output
withCounter bool
withExternalMF bool
}{
{ // 0
headers: map[string]string{
"Accept": "foo/bar;q=0.2, dings/bums;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: []byte{},
},
},
{ // 1
headers: map[string]string{
"Accept": "foo/bar;q=0.2, application/quark;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: []byte{},
},
},
{ // 2
headers: map[string]string{
"Accept": "foo/bar;q=0.2, application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=bla;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: []byte{},
},
},
{ // 3
headers: map[string]string{
"Accept": "text/plain;q=0.2, application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited`,
},
body: []byte{},
},
},
{ // 4
headers: map[string]string{
"Accept": "application/json",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: expectedMetricFamilyAsText,
},
withCounter: true,
},
{ // 5
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited`,
},
body: expectedMetricFamilyAsBytes,
},
withCounter: true,
},
{ // 6
headers: map[string]string{
"Accept": "application/json",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: externalMetricFamilyAsText,
},
withExternalMF: true,
},
{ // 7
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited`,
},
body: externalMetricFamilyAsBytes,
},
withExternalMF: true,
},
{ // 8
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited`,
},
body: bytes.Join(
[][]byte{
externalMetricFamilyAsBytes,
expectedMetricFamilyAsBytes,
},
[]byte{},
),
},
withCounter: true,
withExternalMF: true,
},
{ // 9
headers: map[string]string{
"Accept": "text/plain",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: []byte{},
},
},
{ // 10
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=bla;q=0.2, text/plain;q=0.5",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: expectedMetricFamilyAsText,
},
withCounter: true,
},
{ // 11
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=bla;q=0.2, text/plain;q=0.5;version=0.0.4",
},
out: output{
headers: map[string]string{
"Content-Type": `text/plain; version=0.0.4`,
},
body: bytes.Join(
[][]byte{
externalMetricFamilyAsText,
expectedMetricFamilyAsText,
},
[]byte{},
),
},
withCounter: true,
withExternalMF: true,
},
{ // 12
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited;q=0.2, text/plain;q=0.5;version=0.0.2",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited`,
},
body: bytes.Join(
[][]byte{
externalMetricFamilyAsBytes,
expectedMetricFamilyAsBytes,
},
[]byte{},
),
},
withCounter: true,
withExternalMF: true,
},
{ // 13
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=text;q=0.5, application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited;q=0.4",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=text`,
},
body: bytes.Join(
[][]byte{
externalMetricFamilyAsProtoText,
expectedMetricFamilyAsProtoText,
},
[]byte{},
),
},
withCounter: true,
withExternalMF: true,
},
{ // 14
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=compact-text",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=compact-text`,
},
body: bytes.Join(
[][]byte{
externalMetricFamilyAsProtoCompactText,
expectedMetricFamilyAsProtoCompactText,
},
[]byte{},
),
},
withCounter: true,
withExternalMF: true,
},
}
for i, scenario := range scenarios {
registry := newRegistry()
registry.collectChecksEnabled = true
if scenario.withCounter {
registry.Register(metricVec)
}
if scenario.withExternalMF {
registry.metricFamilyInjectionHook = func() []*dto.MetricFamily {
return externalMetricFamily
}
}
writer := &fakeResponseWriter{
header: http.Header{},
}
handler := InstrumentHandler("prometheus", registry)
request, _ := http.NewRequest("GET", "/", nil)
for key, value := range scenario.headers {
request.Header.Add(key, value)
}
handler(writer, request)
for key, value := range scenario.out.headers {
if writer.Header().Get(key) != value {
t.Errorf(
"%d. expected %q for header %q, got %q",
i, value, key, writer.Header().Get(key),
)
}
}
if !bytes.Equal(scenario.out.body, writer.body.Bytes()) {
t.Errorf(
"%d. expected %q for body, got %q",
i, scenario.out.body, writer.body.Bytes(),
)
}
}
}