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Simplify promlint problems gathering, use protobuf accessors

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Matt Layher 2017-04-14 16:40:40 -04:00
parent 34a4813464
commit cc4198f421
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GPG key ID: 77BFE531397EDE94
1 changed files with 23 additions and 22 deletions
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45
util/promlint/promlint.go
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@ -39,6 +39,19 @@ type Problem struct {
Text string
}
// problems is a slice of Problems with a helper method to easily append
// additional Problems to the slice.
type problems []Problem
// Add appends a new Problem to the slice for the specified metric, with
// the specified issue text.
func (p *problems) Add(mf dto.MetricFamily, text string) {
*p = append(*p, Problem{
Metric: mf.GetName(),
Text: text,
})
}
// New creates a new Linter that reads an input stream of Prometheus metrics.
// Only the text exposition format is supported.
func New(r io.Reader) *Linter {
@ -100,14 +113,11 @@ func lint(mf dto.MetricFamily) []Problem {
// lintHelp detects issues related to the help text for a metric.
func lintHelp(mf dto.MetricFamily) []Problem {
var problems []Problem
var problems problems
// Expect all metrics to have help text available.
if mf.Help == nil {
problems = append(problems, Problem{
Metric: *mf.Name,
Text: "no help text",
})
problems.Add(mf, "no help text")
}
return problems
@ -115,7 +125,7 @@ func lintHelp(mf dto.MetricFamily) []Problem {
// lintMetricUnits detects issues with metric unit names.
func lintMetricUnits(mf dto.MetricFamily) []Problem {
var problems []Problem
var problems problems
unit, base, ok := metricUnits(*mf.Name)
if !ok {
@ -128,10 +138,7 @@ func lintMetricUnits(mf dto.MetricFamily) []Problem {
return nil
}
problems = append(problems, Problem{
Metric: *mf.Name,
Text: fmt.Sprintf("use base unit %q instead of %q", base, unit),
})
problems.Add(mf, fmt.Sprintf("use base unit %q instead of %q", base, unit))
return problems
}
@ -139,23 +146,17 @@ func lintMetricUnits(mf dto.MetricFamily) []Problem {
// lintCounter detects issues specific to counters, as well as patterns that should
// only be used with counters.
func lintCounter(mf dto.MetricFamily) []Problem {
var problems []Problem
var problems problems
isCounter := *mf.Type == dto.MetricType_COUNTER
isUntyped := *mf.Type == dto.MetricType_UNTYPED
hasTotalSuffix := strings.HasSuffix(*mf.Name, "_total")
isCounter := mf.GetType() == dto.MetricType_COUNTER
isUntyped := mf.GetType() == dto.MetricType_UNTYPED
hasTotalSuffix := strings.HasSuffix(mf.GetName(), "_total")
switch {
case isCounter && !hasTotalSuffix:
problems = append(problems, Problem{
Metric: *mf.Name,
Text: `counter metrics should have "_total" suffix`,
})
problems.Add(mf, `counter metrics should have "_total" suffix`)
case !isUntyped && !isCounter && hasTotalSuffix:
problems = append(problems, Problem{
Metric: *mf.Name,
Text: `non-counter metrics should not have "_total" suffix`,
})
problems.Add(mf, `non-counter metrics should not have "_total" suffix`)
}
return problems