forked from mirror/client_golang
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package prometheus
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import (
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"errors"
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"fmt"
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"strings"
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"unicode/utf8"
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"github.com/prometheus/common/model"
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)
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// Labels represents a collection of label name -> value mappings. This type is
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// commonly used with the With(Labels) and GetMetricWith(Labels) methods of
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// metric vector Collectors, e.g.:
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// myVec.With(Labels{"code": "404", "method": "GET"}).Add(42)
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//
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// The other use-case is the specification of constant label pairs in Opts or to
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// create a Desc.
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type Labels map[string]string
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// reservedLabelPrefix is a prefix which is not legal in user-supplied
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// label names.
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const reservedLabelPrefix = "__"
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var errInconsistentCardinality = errors.New("inconsistent label cardinality")
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func validateValuesInLabels(labels Labels, expectedNumberOfValues int) error {
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if len(labels) != expectedNumberOfValues {
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return errInconsistentCardinality
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}
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for name, val := range labels {
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if !utf8.ValidString(val) {
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return fmt.Errorf("label %s: value %q is not valid UTF-8", name, val)
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}
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}
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return nil
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}
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func validateLabelValues(vals []string, expectedNumberOfValues int) error {
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if len(vals) != expectedNumberOfValues {
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return errInconsistentCardinality
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}
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for _, val := range vals {
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if !utf8.ValidString(val) {
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return fmt.Errorf("label value %q is not valid UTF-8", val)
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}
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}
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return nil
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}
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func checkLabelName(l string) bool {
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return model.LabelName(l).IsValid() && !strings.HasPrefix(l, reservedLabelPrefix)
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}
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