logql

package
v0.2.0 Latest Latest
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 Go to latest Published: Dec 10, 2023 License: Apache-2.0 Imports: 9 Imported by: 0

Documentation

Overview

Package logql contains LogQL parser and AST definitions.

Index

Constants

View Source 
const (
	// ErrorLabel is a specific label for LogQL errors.
	ErrorLabel = "__error__"
	// ErrorDetailsLabel is a specific label for LogQL error details.
	ErrorDetailsLabel = "__error_details__"
)

Variables

This section is empty.

Functions

func IsValidLabel 

func IsValidLabel[S ~string | ~[]byte](s S, allowDot bool) error

IsValidLabel validates label name.

Types

type BinOp 

type BinOp int

BinOp defines binary operation. 

const (
	// Logical ops.
	OpAnd BinOp = iota + 1
	OpOr
	OpUnless
	// Math ops.
	OpAdd
	OpSub
	OpMul
	OpDiv
	OpMod
	OpPow
	// Comparison ops.
	OpEq
	OpNotEq
	OpRe
	OpNotRe
	OpGt
	OpGte
	OpLt
	OpLte
)

func (BinOp) IsLogic 

func (op BinOp) IsLogic() bool

IsLogic returns whether operation is logical.

func (BinOp) IsRegex added in v0.0.8 

func (op BinOp) IsRegex() bool

IsRegex returns whether operation is regexp matcher.

func (BinOp) Precedence added in v0.0.8 

func (op BinOp) Precedence() int

Precedence returns operator precedence.

func (BinOp) String 

func (op BinOp) String() string

String implements fmt.Stringer.

type BinOpExpr 

type BinOpExpr struct {
	Left     Expr
	Op       BinOp
	Modifier BinOpModifier
	Right    Expr
}

BinOpExpr defines a binary operation between two Expr.

type BinOpModifier 

type BinOpModifier struct {
	Op         string // on, ignoring
	OpLabels   []Label
	Group      string // "", "left", "right"
	Include    []Label
	ReturnBool bool
}

BinOpModifier defines BinOpExpr modifier.

FIXME(tdakkota): this feature is not well documented.

type BytesFilter 

type BytesFilter struct {
	Label Label
	Op    BinOp // OpEq, OpNotEq, OpLt, OpLte, OpGt, OpGte
	Value uint64
}

BytesFilter is a byte size filtering predicate (`size > 10gb`).

type DecolorizeExpr 

type DecolorizeExpr struct{}

DecolorizeExpr decolorizes log line.

type DistinctFilter 

type DistinctFilter struct {
	Labels []Label
}

DistinctFilter filters out lines with duplicate label values.

FIXME(tdakkota): this stage is undocumented.

type DropLabelsExpr 

type DropLabelsExpr struct {
	Labels   []Label
	Matchers []LabelMatcher
}

DropLabelsExpr drops given labels in a pipeline (i.e. deny list).

type DurationFilter 

type DurationFilter struct {
	Label Label
	Op    BinOp // OpEq, OpNotEq, OpLt, OpLte, OpGt, OpGte
	Value time.Duration
}

DurationFilter is a duration filtering predicate (`elapsed > 10s`).

type Expr 

type Expr interface {
	// contains filtered or unexported methods
}

Expr is a root LogQL expression.

func Parse 

func Parse(s string, opts ParseOptions) (Expr, error)

Parse parses LogQL query from string.

func UnparenExpr 

func UnparenExpr(e Expr) Expr

UnparenExpr recursively extracts expression from parentheses.

type Grouping 

type Grouping struct {
	Labels  []Label
	Without bool
}

Grouping is a grouping clause.

type IPFilter 

type IPFilter struct {
	Label Label
	Op    BinOp // OpEq, OpNotEq
	Value string
}

IPFilter is a IP filtering predicate (`addr == ip("127.0.0.1")`).

type JSONExpressionParser 

type JSONExpressionParser struct {
	// Labels is a set of labels to extract.
	Labels []Label
	// Exprs is a set of extraction expressions.
	Exprs []LabelExtractionExpr
}

JSONExpressionParser extracts and filters labels from JSON.

type KeepLabelsExpr 

type KeepLabelsExpr struct {
	Labels   []Label
	Matchers []LabelMatcher
}

KeepLabelsExpr drops any label except given in a pipeline (i.e. allow list).

type Label 

type Label string

Label is a LogQL identifier.

type LabelExtractionExpr 

type LabelExtractionExpr struct {
	Label Label
	Expr  string
}

LabelExtractionExpr defines label value to extract.

type LabelFilter 

type LabelFilter struct {
	Pred LabelPredicate
}

LabelFilter filters records by predicate.

type LabelFormatExpr 

type LabelFormatExpr struct {
	// FIXME(tdakkota): use map[K][]V?
	Labels []RenameLabel
	Values []LabelTemplate
}

LabelFormatExpr renames, modifies or add labels.

type LabelMatcher 

type LabelMatcher struct {
	Label Label
	Op    BinOp          // OpEq, OpNotEq, OpRe, OpNotRe
	Value string         // Equals to value or to unparsed regexp
	Re    *regexp.Regexp // Equals to nil, if Op is not OpRe or OpNotRe
}

LabelMatcher is label matching predicate.

type LabelPredicate 

type LabelPredicate interface {
	// contains filtered or unexported methods
}

LabelPredicate is a label predicate.

type LabelPredicateBinOp 

type LabelPredicateBinOp struct {
	Left  LabelPredicate
	Op    BinOp // OpAnd, OpOr
	Right LabelPredicate
}

LabelPredicateBinOp defines a logical operation between predicates.

type LabelPredicateParen 

type LabelPredicateParen struct {
	X LabelPredicate
}

LabelPredicateParen is a prediacte within parenthesis.

FIXME(tdakkota): are we really need it?

type LabelReplaceExpr 

type LabelReplaceExpr struct {
	Expr        MetricExpr
	DstLabel    string
	Replacement string
	SrcLabel    string
	Regex       string
	Re          *regexp.Regexp // Compiled Regex
}

LabelReplaceExpr is a PromQL `label_replace` function.

type LabelTemplate 

type LabelTemplate struct {
	Label    Label
	Template string
}

LabelTemplate sets value for a label.

type LineFilter 

type LineFilter struct {
	Op    BinOp          // OpEq, OpNotEq, OpRe, OpNotRe
	Value string         // Equals to value or to unparsed regexp
	Re    *regexp.Regexp // Equals to nil, if Op is not OpRe or OpNotRe
	IP    bool           // true, if this line filter is IP filter.
}

LineFilter is a line filter (`|=`, `!=`, `=~`, `!~`).

type LineFormat 

type LineFormat struct {
	Template string
}

LineFormat formats log record using Go template.

type LiteralExpr 

type LiteralExpr struct {
	Value float64
}

LiteralExpr is a literal expression.

func ReduceBinOp 

func ReduceBinOp(b *BinOpExpr) (_ *LiteralExpr, err error)

ReduceBinOp recursively precomputes literal expression.

If expression is not constant, returns nil.

type LogExpr 

type LogExpr struct {
	Sel      Selector
	Pipeline []PipelineStage
}

LogExpr is a log query expression.

See https://grafana.com/docs/loki/latest/logql/log_queries/

type LogRangeExpr 

type LogRangeExpr struct {
	Sel      Selector
	Range    time.Duration
	Pipeline []PipelineStage
	Unwrap   *UnwrapExpr
	Offset   *OffsetExpr
}

LogRangeExpr is a log range aggregation expression.

See https://grafana.com/docs/loki/latest/logql/metric_queries/#log-range-aggregations.

type LogfmtExpressionParser 

type LogfmtExpressionParser struct {
	// Labels is a set of labels to extract.
	Labels []Label
	// Exprs is a set of extraction expressions.
	Exprs []LabelExtractionExpr
}

LogfmtExpressionParser extracts and filters labels from Logfmt.

type MetricExpr 

type MetricExpr interface {
	Expr
	// contains filtered or unexported methods
}

MetricExpr is a metric query expression.

See https://grafana.com/docs/loki/latest/logql/metric_queries/.

type NumberFilter 

type NumberFilter struct {
	Label Label
	Op    BinOp // OpEq, OpNotEq, OpLt, OpLte, OpGt, OpGte
	// FIXME(tdakkota): add integer field?
	Value float64
}

NumberFilter is a number filtering predicate (`status >= 400`).

type OffsetExpr 

type OffsetExpr struct {
	Duration time.Duration
}

OffsetExpr defines aggregation time offset.

type ParenExpr 

type ParenExpr struct {
	X Expr
}

ParenExpr is parenthesized Expr.

type ParseOptions 

type ParseOptions struct {
	// AllowDots allows dots in identifiers.
	AllowDots bool
}

ParseOptions is LogQL parser options.

type PatternLabelParser 

type PatternLabelParser struct {
	Pattern string
}

PatternLabelParser extracts labels using log pattern.

See https://grafana.com/docs/loki/latest/logql/log_queries/#pattern.

type PipelineStage 

type PipelineStage interface {
	// contains filtered or unexported methods
}

PipelineStage is a LogQL pipeline stage.

type RangeAggregationExpr 

type RangeAggregationExpr struct {
	Op        RangeOp
	Range     LogRangeExpr
	Parameter *float64
	Grouping  *Grouping
}

RangeAggregationExpr is a range aggregation expression.

type RangeOp 

type RangeOp int

RangeOp defines range aggregation operation. 

const (
	RangeOpCount RangeOp = iota + 1
	RangeOpRate
	RangeOpRateCounter
	RangeOpBytes
	RangeOpBytesRate
	RangeOpAvg
	RangeOpSum
	RangeOpMin
	RangeOpMax
	RangeOpStdvar
	RangeOpStddev
	RangeOpQuantile
	RangeOpFirst
	RangeOpLast
	RangeOpAbsent
)

func (RangeOp) String 

func (op RangeOp) String() string

String implements fmt.Stringer.

type RegexpLabelParser 

type RegexpLabelParser struct {
	Regexp  *regexp.Regexp
	Mapping map[int]Label
}

RegexpLabelParser extracts labels using regexp capture groups.

type RenameLabel 

type RenameLabel struct {
	Label Label
	To    Label
}

RenameLabel renames label.

type Selector 

type Selector struct {
	Matchers []LabelMatcher
}

Selector is a labels selector.

func ParseSelector 

func ParseSelector(s string, opts ParseOptions) (sel Selector, _ error)

ParseSelector parses label selector from string.

type UnpackLabelParser 

type UnpackLabelParser struct{}

UnpackLabelParser unpacks data from promtail.

See https://grafana.com/docs/loki/latest/logql/log_queries/#unpack.

type UnwrapExpr 

type UnwrapExpr struct {
	Op      string
	Label   Label
	Filters []LabelMatcher
}

UnwrapExpr sets labels to perform aggregation.

See https://grafana.com/docs/loki/latest/logql/metric_queries/#unwrapped-range-aggregations.

type VectorAggregationExpr 

type VectorAggregationExpr struct {
	Op        VectorOp
	Expr      MetricExpr
	Parameter *int
	Grouping  *Grouping
}

VectorAggregationExpr is a vector aggregation expression.

type VectorExpr 

type VectorExpr struct {
	Value float64
}

VectorExpr is a vector expression.

type VectorOp 

type VectorOp int

VectorOp defines vector aggregation operation. 

const (
	VectorOpSum VectorOp = iota + 1
	VectorOpAvg
	VectorOpCount
	VectorOpMax
	VectorOpMin
	VectorOpStddev
	VectorOpStdvar
	VectorOpBottomk
	VectorOpTopk
	VectorOpSort
	VectorOpSortDesc
)

func (VectorOp) String 

func (op VectorOp) String() string

String implements fmt.Stringer.

Source Files

View all Source files

Directories

Path Synopsis
Package lexer contains LogQL lexer.
 Package lexer contains LogQL lexer.
Package logqlengine implements LogQL evaluation engine.
 Package logqlengine implements LogQL evaluation engine.
jsonexpr
Package jsonexpr provides JSON extractor expression parser.
 Package jsonexpr provides JSON extractor expression parser.
logqlmetric
Package logqlmetric provides metric queries implementation.
 Package logqlmetric provides metric queries implementation.
logqlpattern
Package logqlpattern contains parser for LogQL `pattern` stage pattern.
 Package logqlpattern contains parser for LogQL `pattern` stage pattern.

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