Add check for duplicated label names
Fixes #471 Signed-off-by: beorn7 <beorn@soundcloud.com>
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dd9e125455
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@ -787,6 +787,8 @@ func checkMetricConsistency(
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dtoMetric *dto.Metric,
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metricHashes map[uint64]struct{},
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) error {
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name := metricFamily.GetName()
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// Type consistency with metric family.
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if metricFamily.GetType() == dto.MetricType_GAUGE && dtoMetric.Gauge == nil ||
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metricFamily.GetType() == dto.MetricType_COUNTER && dtoMetric.Counter == nil ||
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@ -795,33 +797,42 @@ func checkMetricConsistency(
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metricFamily.GetType() == dto.MetricType_UNTYPED && dtoMetric.Untyped == nil {
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return fmt.Errorf(
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"collected metric %q { %s} is not a %s",
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metricFamily.GetName(), dtoMetric, metricFamily.GetType(),
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name, dtoMetric, metricFamily.GetType(),
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)
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}
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previousLabelName := ""
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for _, labelPair := range dtoMetric.GetLabel() {
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if !checkLabelName(labelPair.GetName()) {
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labelName := labelPair.GetName()
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if labelName == previousLabelName {
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return fmt.Errorf(
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"collected metric %q { %s} has a label with an invalid name: %s",
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metricFamily.GetName(), dtoMetric, labelPair.GetName(),
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"collected metric %q { %s} has two or more labels with the same name: %s",
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name, dtoMetric, labelName,
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)
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}
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if dtoMetric.Summary != nil && labelPair.GetName() == quantileLabel {
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if !checkLabelName(labelName) {
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return fmt.Errorf(
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"collected metric %q { %s} has a label with an invalid name: %s",
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name, dtoMetric, labelName,
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)
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}
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if dtoMetric.Summary != nil && labelName == quantileLabel {
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return fmt.Errorf(
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"collected metric %q { %s} must not have an explicit %q label",
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metricFamily.GetName(), dtoMetric, quantileLabel,
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name, dtoMetric, quantileLabel,
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)
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}
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if !utf8.ValidString(labelPair.GetValue()) {
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return fmt.Errorf(
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"collected metric %q { %s} has a label named %q whose value is not utf8: %#v",
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metricFamily.GetName(), dtoMetric, labelPair.GetName(), labelPair.GetValue())
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name, dtoMetric, labelName, labelPair.GetValue())
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}
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previousLabelName = labelName
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}
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// Is the metric unique (i.e. no other metric with the same name and the same labels)?
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h := hashNew()
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h = hashAdd(h, metricFamily.GetName())
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h = hashAdd(h, name)
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h = hashAddByte(h, separatorByte)
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// Make sure label pairs are sorted. We depend on it for the consistency
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// check.
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@ -835,7 +846,7 @@ func checkMetricConsistency(
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if _, exists := metricHashes[h]; exists {
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return fmt.Errorf(
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"collected metric %q { %s} was collected before with the same name and label values",
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metricFamily.GetName(), dtoMetric,
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name, dtoMetric,
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)
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}
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metricHashes[h] = struct{}{}
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@ -330,7 +330,10 @@ collected metric named "complex_count" collides with previously collected histog
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},
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},
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}
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duplicateLabelMsg := []byte(`duplicate label mumble mumble`)
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duplicateLabelMsg := []byte(`An error has occurred during metrics gathering:
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collected metric "broken_metric" { label:<name:"foo" value:"bar" > label:<name:"foo" value:"baz" > counter:<value:2.7 > } has two or more labels with the same name: foo
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`)
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type output struct {
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headers map[string]string
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@ -675,7 +678,7 @@ collected metric named "complex_count" collides with previously collected histog
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},
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out: output{
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headers: map[string]string{
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"Content-Type": `text/plain; version=0.0.4; charset=utf-8`,
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"Content-Type": `text/plain; charset=utf-8`,
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},
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body: duplicateLabelMsg,
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},
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