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Update label validation to run once per metric #369

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Update label validation to run once per metric #369

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14 changes: 10 additions & 4 deletions expfmt/text_parse.go
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Original file line number Diff line number Diff line change
Expand Up @@ -272,7 +272,7 @@ func (p *TextParser) startLabelName() stateFn {
if p.skipBlankTab(); p.err != nil {
return nil // Unexpected end of input.
}
return p.readingValue
return p.validateLabelNames
}
if p.readTokenAsLabelName(); p.err != nil {
return nil // Unexpected end of input.
Expand All @@ -299,7 +299,13 @@ func (p *TextParser) startLabelName() stateFn {
p.parseError(fmt.Sprintf("expected '=' after label name, found %q", p.currentByte))
return nil
}
// Check for duplicate label names.

return p.startLabelValue
}

// validateLabelNames represents the state where label names and values have been read
// and should be checked for duplicates
func (p *TextParser) validateLabelNames() stateFn {
labels := make(map[string]struct{})
for _, l := range p.currentMetric.Label {
lName := l.GetName()
Expand All @@ -310,7 +316,7 @@ func (p *TextParser) startLabelName() stateFn {
return nil
}
}
return p.startLabelValue
return p.readingValue
}

// startLabelValue represents the state where the next byte read from p.buf is
Expand Down Expand Up @@ -368,7 +374,7 @@ func (p *TextParser) startLabelValue() stateFn {
if p.skipBlankTab(); p.err != nil {
return nil // Unexpected end of input.
}
return p.readingValue
return p.validateLabelNames
default:
p.parseError(fmt.Sprintf("unexpected end of label value %q", p.currentLabelPair.GetValue()))
return nil
Expand Down