labels

package
v0.42.0 Latest Latest
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 Go to latest Published: Jan 31, 2023 License: Apache-2.0 Imports: 12 Imported by: 868

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Constants

View Source 
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) Keep added in v0.37.0 

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

Keep removes all labels from the base except those with the given names.

func (*Builder) Labels 

func (b *Builder) Labels(res Labels) Labels

Labels returns the labels from the builder, adding them to res if non-nil. Argument res can be the same as b.base, if caller wants to overwrite that slice. 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. A value of "" means delete that 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 EmptyLabels added in v0.39.0 

func EmptyLabels() Labels

EmptyLabels returns n empty Labels value, for convenience.

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) BytesWithLabels added in v0.37.0 

func (ls Labels) BytesWithLabels(buf []byte, names ...string) []byte

BytesWithLabels is just as Bytes(), but only for labels matching names. 'names' have to be sorted in ascending order.

func (Labels) BytesWithoutLabels added in v0.37.0 

func (ls Labels) BytesWithoutLabels(buf []byte, names ...string) []byte

BytesWithoutLabels is just as Bytes(), but only for labels not matching names. 'names' have to be sorted in ascending order.

func (Labels) Copy 

func (ls Labels) Copy() Labels

Copy returns a copy of the labels.

func (*Labels) CopyFrom added in v0.42.0 

func (ls *Labels) CopyFrom(b Labels)

Copy labels from b on top of whatever was in ls previously, reusing memory or expanding if needed.

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. Note: the result is not guaranteed to be consistent across different runs of Prometheus.

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) InternStrings added in v0.42.0 

func (ls *Labels) InternStrings(intern func(string) string)

InternStrings calls intern on every string value inside ls, replacing them with what it returns.

func (Labels) IsEmpty added in v0.42.0 

func (ls Labels) IsEmpty() bool

IsEmpty returns true if ls represents an empty set of labels.

func (Labels) IsValid added in v0.41.0 

func (ls Labels) IsValid() bool

IsValid checks if the metric name or label names are valid.

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) Range added in v0.42.0 

func (ls Labels) Range(f func(l Label))

Range calls f on each label.

func (Labels) ReleaseStrings added in v0.42.0 

func (ls Labels) ReleaseStrings(release func(string))

ReleaseStrings calls release on every string value inside ls.

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) Validate added in v0.42.0 

func (ls Labels) Validate(f func(l Label) error) error

Validate calls f on each label. If f returns a non-nil error, then it returns that error cancelling the iteration.

func (Labels) WithoutEmpty 

func (ls Labels) WithoutEmpty() Labels

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

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 ScratchBuilder added in v0.42.0 

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

ScratchBuilder allows efficient construction of a Labels from scratch.

func NewScratchBuilder added in v0.42.0 

func NewScratchBuilder(n int) ScratchBuilder

NewScratchBuilder creates a ScratchBuilder initialized for Labels with n entries.

func (*ScratchBuilder) Add added in v0.42.0 

func (b *ScratchBuilder) Add(name, value string)

Add a name/value pair. Note if you Add the same name twice you will get a duplicate label, which is invalid.

func (*ScratchBuilder) Assign added in v0.42.0 

func (b *ScratchBuilder) Assign(ls Labels)

Asssign is for when you already have a Labels which you want this ScratchBuilder to return.

func (*ScratchBuilder) Labels added in v0.42.0 

func (b *ScratchBuilder) Labels() Labels

Return the name/value pairs added so far as a Labels object. Note: if you want them sorted, call Sort() first.

func (*ScratchBuilder) Reset added in v0.42.0 

func (b *ScratchBuilder) Reset()

func (*ScratchBuilder) Sort added in v0.42.0 

func (b *ScratchBuilder) Sort()

Sort the labels added so far by name.

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)

Source Files

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