proxystorage

Documentation

Index

• Constants
• func CloneExpr(expr promql.Expr) (newExpr promql.Expr)
• func PreserveLabel(expr promql.Expr, srcLabel string, dstLabel string) (relabelExpress promql.Expr)
• type BooleanFinder
  • func (f *BooleanFinder) Visit(node promql.Node, _ []promql.Node) (promql.Visitor, error)
• type MultiVisitor
  • func NewMultiVisitor(visitors []promql.Visitor) *MultiVisitor
  • func (v *MultiVisitor) Visit(node promql.Node, path []promql.Node) (promql.Visitor, error)
• type OffsetFinder
  • func (o *OffsetFinder) Visit(node promql.Node, _ []promql.Node) (promql.Visitor, error)
• type OffsetRemover
  • func (o *OffsetRemover) Visit(node promql.Node, _ []promql.Node) (promql.Visitor, error)
• type ProxyStorage
  • func NewProxyStorage() (*ProxyStorage, error)
  • func (p *ProxyStorage) Appender() (storage.Appender, error)
  • func (p *ProxyStorage) ApplyConfig(c *proxyconfig.Config) error
  • func (p *ProxyStorage) Close() error
  • func (p *ProxyStorage) GetState() *proxyStorageState
  • func (p *ProxyStorage) NodeReplacer(ctx context.Context, s *promql.EvalStmt, node promql.Node) (promql.Node, error)
  • func (p *ProxyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error)
  • func (p *ProxyStorage) StartTime() (int64, error)

Constants

const MetricNameWorkaroundLabel = "__name"

Functions

func CloneExpr

func CloneExpr(expr promql.Expr) (newExpr promql.Expr)

func PreserveLabel

func PreserveLabel(expr promql.Expr, srcLabel string, dstLabel string) (relabelExpress promql.Expr)

PreserveLabel wraps the input expression with a label replace in order to preserve the metadata through binary expressions

Types

type BooleanFinder

type BooleanFinder struct {
	Func  func(promql.Node) bool
	Found int
}

BooleanFinder uses the given func to determine if something is in there or notret := &promql.VectorSelector{Offset: offset}

func (*BooleanFinder) Visit

func (f *BooleanFinder) Visit(node promql.Node, _ []promql.Node) (promql.Visitor, error)

Visit runs on each node in the tree

type MultiVisitor

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

MultiVisitor runs a set of visitors on the same pass over the node tree

func NewMultiVisitor

func NewMultiVisitor(visitors []promql.Visitor) *MultiVisitor

NewMultiVisitor takes a set of visitors and returns a MultiVisitor

func (*MultiVisitor) Visit

func (v *MultiVisitor) Visit(node promql.Node, path []promql.Node) (promql.Visitor, error)

Visit runs on each node in the tree

type OffsetFinder

type OffsetFinder struct {
	Found  bool
	Offset time.Duration
	Error  error
	// contains filtered or unexported fields
}

OffsetFinder finds the offset (if any) within the tree

func (*OffsetFinder) Visit

func (o *OffsetFinder) Visit(node promql.Node, _ []promql.Node) (promql.Visitor, error)

Visit runs on each node in the tree

type OffsetRemover

type OffsetRemover struct{}

OffsetRemover removes any offset found in the node tree This is required when we send the queries below as we want to actually *remove* the offset.

func (*OffsetRemover) Visit

func (o *OffsetRemover) Visit(node promql.Node, _ []promql.Node) (promql.Visitor, error)

Visit runs on each node in the tree

type ProxyStorage

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

ProxyStorage implements prometheus' Storage interface

func NewProxyStorage

func NewProxyStorage() (*ProxyStorage, error)

NewProxyStorage creates a new ProxyStorage

func (*ProxyStorage) Appender

func (p *ProxyStorage) Appender() (storage.Appender, error)

Appender returns a new appender against the storage.

func (*ProxyStorage) ApplyConfig

func (p *ProxyStorage) ApplyConfig(c *proxyconfig.Config) error

ApplyConfig updates the current state of this ProxyStorage

func (*ProxyStorage) Close

func (p *ProxyStorage) Close() error

Close releases the resources of the Querier.

func (*ProxyStorage) GetState

func (p *ProxyStorage) GetState() *proxyStorageState

GetState returns the current state of the ProxyStorage

func (*ProxyStorage) NodeReplacer

func (p *ProxyStorage) NodeReplacer(ctx context.Context, s *promql.EvalStmt, node promql.Node) (promql.Node, error)

NodeReplacer replaces promql Nodes with more efficient-to-fetch ones. This works by taking lower-layer chunks of the query, farming them out to prometheus hosts, then stitching the results back together. An example would be a sum, we can sum multiple sums and come up with the same result -- so we do. There are a few ground rules for this:

• Children cannot be AggregateExpr: aggregates have their own combining logic, so its not safe to send a subquery with additional aggregations
• offsets within the subtree must match: if they don't then we'll get mismatched data, so we wait until we are far enough down the tree that they converge
• Don't reduce accuracy/granularity: the intention of this is to get the correct data faster, meaning correctness overrules speed.

func (*ProxyStorage) Querier

func (p *ProxyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error)

Querier returns a new Querier on the storage.

func (*ProxyStorage) StartTime

func (p *ProxyStorage) StartTime() (int64, error)

StartTime returns the oldest timestamp stored in the storage.