labels

package
Version: v1.8.2-0...-37468d8 Latest Latest
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Published: Sep 14, 2021 License: Apache-2.0 Imports: 12 Imported by: 0

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Constants

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const (
	MetricName   = "__name__"
	AlertName    = "alertname"
	BucketLabel  = "le"
	InstanceName = "instance"
)

Well-known label names used by Prometheus components.

Variables

This section is empty.

Functions

func Compare

func Compare(a, b Labels) int

Compare compares the two label sets. The result will be 0 if a==b, <0 if a < b, and >0 if a > b.

func Equal

func Equal(ls, o Labels) bool

Equal returns whether the two label sets are equal.

Types

type Builder

type Builder struct {
	// contains filtered or unexported fields
}

Builder allows modifying Labels.

func NewBuilder

func NewBuilder(base Labels) *Builder

NewBuilder returns a new LabelsBuilder.

func (*Builder) Del

func (b *Builder) Del(ns ...string) *Builder

Del deletes the label of the given name.

func (*Builder) Labels

func (b *Builder) Labels() Labels

Labels returns the labels from the builder. If no modifications were made, the original labels are returned.

func (*Builder) Reset

func (b *Builder) Reset(base Labels)

Reset clears all current state for the builder.

func (*Builder) Set

func (b *Builder) Set(n, v string) *Builder

Set the name/value pair as a label.

type FastRegexMatcher

type FastRegexMatcher struct {
	// contains filtered or unexported fields
}

func NewFastRegexMatcher

func NewFastRegexMatcher(v string) (*FastRegexMatcher, error)

func (*FastRegexMatcher) GetRegexString

func (m *FastRegexMatcher) GetRegexString() string

func (*FastRegexMatcher) MatchString

func (m *FastRegexMatcher) MatchString(s string) bool

type Label

type Label struct {
	Name, Value string
}

Label is a key/value pair of strings.

type Labels

type Labels []Label

Labels is a sorted set of labels. Order has to be guaranteed upon instantiation.

func FromMap

func FromMap(m map[string]string) Labels

FromMap returns new sorted Labels from the given map.

func FromStrings

func FromStrings(ss ...string) Labels

FromStrings creates new labels from pairs of strings.

func New

func New(ls ...Label) Labels

New returns a sorted Labels from the given labels. The caller has to guarantee that all label names are unique.

func ReadLabels

func ReadLabels(fn string, n int) ([]Labels, error)

ReadLabels reads up to n label sets in a JSON formatted file fn. It is mostly useful to load testing data.

func (Labels) Bytes

func (ls Labels) Bytes(buf []byte) []byte

Bytes returns ls as a byte slice. It uses an byte invalid character as a separator and so should not be used for printing.

func (Labels) Copy

func (ls Labels) Copy() Labels

Copy returns a copy of the labels.

func (Labels) Get

func (ls Labels) Get(name string) string

Get returns the value for the label with the given name. Returns an empty string if the label doesn't exist.

func (Labels) Has

func (ls Labels) Has(name string) bool

Has returns true if the label with the given name is present.

func (Labels) HasDuplicateLabelNames

func (ls Labels) HasDuplicateLabelNames() (string, bool)

HasDuplicateLabelNames returns whether ls has duplicate label names. It assumes that the labelset is sorted.

func (Labels) Hash

func (ls Labels) Hash() uint64

Hash returns a hash value for the label set.

func (Labels) HashForLabels

func (ls Labels) HashForLabels(b []byte, names ...string) (uint64, []byte)

HashForLabels returns a hash value for the labels matching the provided names. 'names' have to be sorted in ascending order.

func (Labels) HashWithoutLabels

func (ls Labels) HashWithoutLabels(b []byte, names ...string) (uint64, []byte)

HashWithoutLabels returns a hash value for all labels except those matching the provided names. 'names' have to be sorted in ascending order.

func (Labels) Len

func (ls Labels) Len() int

func (Labels) Less

func (ls Labels) Less(i, j int) bool

func (Labels) Map

func (ls Labels) Map() map[string]string

Map returns a string map of the labels.

func (Labels) MarshalJSON

func (ls Labels) MarshalJSON() ([]byte, error)

MarshalJSON implements json.Marshaler.

func (Labels) MarshalYAML

func (ls Labels) MarshalYAML() (interface{}, error)

MarshalYAML implements yaml.Marshaler.

func (Labels) MatchLabels

func (ls Labels) MatchLabels(on bool, names ...string) Labels

MatchLabels returns a subset of Labels that matches/does not match with the provided label names based on the 'on' boolean. If on is set to true, it returns the subset of labels that match with the provided label names and its inverse when 'on' is set to false.

func (Labels) String

func (ls Labels) String() string

func (Labels) Swap

func (ls Labels) Swap(i, j int)

func (*Labels) UnmarshalJSON

func (ls *Labels) UnmarshalJSON(b []byte) error

UnmarshalJSON implements json.Unmarshaler.

func (*Labels) UnmarshalYAML

func (ls *Labels) UnmarshalYAML(unmarshal func(interface{}) error) error

UnmarshalYAML implements yaml.Unmarshaler.

func (Labels) WithLabels

func (ls Labels) WithLabels(names ...string) Labels

WithLabels returns a new labels.Labels from ls that only contains labels matching names. 'names' have to be sorted in ascending order.

func (Labels) WithoutEmpty

func (ls Labels) WithoutEmpty() Labels

WithoutEmpty returns the labelset without empty labels. May return the same labelset.

func (Labels) WithoutLabels

func (ls Labels) WithoutLabels(names ...string) Labels

WithoutLabels returns a new labels.Labels from ls that contains labels not matching names. 'names' have to be sorted in ascending order.

type MatchType

type MatchType int

MatchType is an enum for label matching types.

const (
	MatchEqual MatchType = iota
	MatchNotEqual
	MatchRegexp
	MatchNotRegexp
)

Possible MatchTypes.

func (MatchType) String

func (m MatchType) String() string

type Matcher

type Matcher struct {
	Type  MatchType
	Name  string
	Value string
	// contains filtered or unexported fields
}

Matcher models the matching of a label.

func MustNewMatcher

func MustNewMatcher(mt MatchType, name, val string) *Matcher

MustNewMatcher panics on error - only for use in tests!

func NewMatcher

func NewMatcher(t MatchType, n, v string) (*Matcher, error)

NewMatcher returns a matcher object.

func (*Matcher) GetRegexString

func (m *Matcher) GetRegexString() string

GetRegexString returns the regex string.

func (*Matcher) Inverse

func (m *Matcher) Inverse() (*Matcher, error)

Inverse returns a matcher that matches the opposite.

func (*Matcher) Matches

func (m *Matcher) Matches(s string) bool

Matches returns whether the matcher matches the given string value.

func (*Matcher) String

func (m *Matcher) String() string

type Selector

type Selector []*Matcher

Selector holds constraints for matching against a label set.

func (Selector) Matches

func (s Selector) Matches(labels Labels) bool

Matches returns whether the labels satisfy all matchers.

type Slice

type Slice []Labels

Slice is a sortable slice of label sets.

func (Slice) Len

func (s Slice) Len() int

func (Slice) Less

func (s Slice) Less(i, j int) bool

func (Slice) Swap

func (s Slice) Swap(i, j int)

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