labels

package
v0.0.0-...-bec5d16 Latest Latest
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 Go to latest Published: Apr 16, 2024 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Index

Constants

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

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.

func StableHash 

func StableHash(ls Labels) uint64

StableHash is a labels hashing implementation which is guaranteed to not change over time. This function should be used whenever labels hashing backward compatibility must be guaranteed.

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 NewBuilderWithSymbolTable 

func NewBuilderWithSymbolTable(_ *SymbolTable) *Builder

NewBuilderWithSymbolTable creates a Builder, for api parity with dedupelabels.

func (*Builder) Del 

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

Del deletes the label of the given name.

func (*Builder) Get 

func (b *Builder) Get(n string) string

func (*Builder) Keep 

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() Labels

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

func (*Builder) Range 

func (b *Builder) Range(f func(l Label))

Range calls f on each label in the Builder.

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) IsOptimized 

func (m *FastRegexMatcher) IsOptimized() bool

IsOptimized returns true if any fast-path optimization is applied to the regex matcher.

func (*FastRegexMatcher) MatchString 

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

func (*FastRegexMatcher) SetMatches 

func (m *FastRegexMatcher) SetMatches() []string

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 

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 

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 

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 

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) DropMetricName 

func (ls Labels) DropMetricName() Labels

DropMetricName returns Labels with "__name__" removed.

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 

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 

func (ls Labels) IsEmpty() bool

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

func (Labels) IsValid 

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 

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

Range calls f on each label.

func (Labels) ReleaseStrings 

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 

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) IsRegexOptimized 

func (m *Matcher) IsRegexOptimized() bool

IsRegexOptimized returns whether regex is optimized.

func (*Matcher) Matches 

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

Matches returns whether the matcher matches the given string value.

func (*Matcher) Prefix 

func (m *Matcher) Prefix() string

Prefix returns the required prefix of the value to match, if possible. It will be empty if it's an equality matcher or if the prefix can't be determined.

func (*Matcher) SetMatches 

func (m *Matcher) SetMatches() []string

SetMatches returns a set of equality matchers for the current regex matchers if possible. For examples the regexp `a(b|f)` will returns "ab" and "af". Returns nil if we can't replace the regexp by only equality matchers.

func (*Matcher) String 

func (m *Matcher) String() string

type ScratchBuilder 

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

ScratchBuilder allows efficient construction of a Labels from scratch.

func NewScratchBuilder 

func NewScratchBuilder(n int) ScratchBuilder

NewScratchBuilder creates a ScratchBuilder initialized for Labels with n entries.

func NewScratchBuilderWithSymbolTable 

func NewScratchBuilderWithSymbolTable(_ *SymbolTable, n int) ScratchBuilder

NewScratchBuilderWithSymbolTable creates a ScratchBuilder, for api parity with dedupelabels.

func (*ScratchBuilder) Add 

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 

func (b *ScratchBuilder) Assign(ls Labels)

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

func (*ScratchBuilder) Labels 

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) Overwrite 

func (b *ScratchBuilder) Overwrite(ls *Labels)

Write the newly-built Labels out to ls. Callers must ensure that there are no other references to ls, or any strings fetched from it.

func (*ScratchBuilder) Reset 

func (b *ScratchBuilder) Reset()

func (*ScratchBuilder) SetSymbolTable 

func (b *ScratchBuilder) SetSymbolTable(_ *SymbolTable)

func (*ScratchBuilder) Sort 

func (b *ScratchBuilder) Sort()

Sort the labels added so far by name.

func (*ScratchBuilder) UnsafeAddBytes 

func (b *ScratchBuilder) UnsafeAddBytes(name, value []byte)

Add a name/value pair, using []byte instead of string. The '-tags stringlabels' version of this function is unsafe, hence the name. This version is safe - it copies the strings immediately - but we keep the same name so everything compiles.

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)

type StringMatcher 

type StringMatcher interface {
	Matches(s string) bool
}

StringMatcher is a matcher that matches a string in place of a regular expression.

type SymbolTable 

type SymbolTable struct{}

Symbol-table is no-op, just for api parity with dedupelabels.

func NewSymbolTable 

func NewSymbolTable() *SymbolTable

func (*SymbolTable) Len 

func (t *SymbolTable) Len() int

Source Files

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