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pruner.go
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/
pruner.go
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package pruner
import (
"context"
"fmt"
"time"
"github.com/rs/zerolog"
"github.com/onflow/flow-go/module"
"github.com/onflow/flow-go/module/component"
"github.com/onflow/flow-go/module/executiondatasync/tracker"
"github.com/onflow/flow-go/module/irrecoverable"
"github.com/onflow/flow-go/module/util"
)
const (
defaultHeightRangeTarget = uint64(400_000)
defaultThreshold = uint64(100_000)
)
// Pruner is a component responsible for pruning data from
// execution data storage. It is configured with the following
// parameters:
// * Height range target: The target number of most recent blocks
// to store data for. This controls the total amount of data
// stored on disk.
// * Threshold: The number of block heights that we can exceed
// the height range target by before pruning is triggered. This
// controls the frequency of pruning.
// The Pruner consumes a stream of tracked height notifications,
// and triggers pruning once the difference between the tracked
// height and the last pruned height reaches the height range
// target + threshold.
// A height is considered fulfilled once it has both been executed,
// tracked, and sealed.
type Pruner struct {
storage tracker.Storage
pruneCallback func(ctx context.Context) error
// channels used to send new fulfilled heights and config changes to the worker thread
fulfilledHeights chan uint64
thresholdChan chan uint64
heightRangeTargetChan chan uint64
lastFulfilledHeight uint64
lastPrunedHeight uint64
// the height range is the range of heights between the last pruned and last fulfilled
// heightRangeTarget is the target minimum value for this range, so that after pruning
// the height range is equal to the target.
heightRangeTarget uint64
// threshold defines the maximum height range and how frequently pruning is performed.
// once the height range reaches `heightRangeTarget+threshold`, `threshold` many blocks
// are pruned
threshold uint64
logger zerolog.Logger
metrics module.ExecutionDataPrunerMetrics
component.Component
cm *component.ComponentManager
}
type PrunerOption func(*Pruner)
// WithHeightRangeTarget is used to configure the pruner with a custom
// height range target.
func WithHeightRangeTarget(heightRangeTarget uint64) PrunerOption {
return func(p *Pruner) {
p.heightRangeTarget = heightRangeTarget
}
}
// WithThreshold is used to configure the pruner with a custom threshold.
func WithThreshold(threshold uint64) PrunerOption {
return func(p *Pruner) {
p.threshold = threshold
}
}
func WithPruneCallback(callback func(context.Context) error) PrunerOption {
return func(p *Pruner) {
p.pruneCallback = callback
}
}
// NewPruner creates a new Pruner.
func NewPruner(logger zerolog.Logger, metrics module.ExecutionDataPrunerMetrics, storage tracker.Storage, opts ...PrunerOption) (*Pruner, error) {
lastPrunedHeight, err := storage.GetPrunedHeight()
if err != nil {
return nil, fmt.Errorf("failed to get pruned height: %w", err)
}
fulfilledHeight, err := storage.GetFulfilledHeight()
if err != nil {
return nil, fmt.Errorf("failed to get fulfilled height: %w", err)
}
fulfilledHeights := make(chan uint64, 32)
fulfilledHeights <- fulfilledHeight
p := &Pruner{
logger: logger.With().Str("component", "execution_data_pruner").Logger(),
storage: storage,
pruneCallback: func(ctx context.Context) error { return nil },
fulfilledHeights: fulfilledHeights,
thresholdChan: make(chan uint64),
heightRangeTargetChan: make(chan uint64),
lastFulfilledHeight: fulfilledHeight,
lastPrunedHeight: lastPrunedHeight,
heightRangeTarget: defaultHeightRangeTarget,
threshold: defaultThreshold,
metrics: metrics,
}
p.cm = component.NewComponentManagerBuilder().
AddWorker(p.loop).
Build()
p.Component = p.cm
for _, opt := range opts {
opt(p)
}
return p, nil
}
// NotifyFulfilledHeight notifies the Pruner of the latest fulfilled height.
func (p *Pruner) NotifyFulfilledHeight(height uint64) {
if util.CheckClosed(p.cm.ShutdownSignal()) {
return
}
select {
case p.fulfilledHeights <- height:
default:
}
}
// SetHeightRangeTarget updates the Pruner's height range target.
// This may block for the duration of a pruning operation.
func (p *Pruner) SetHeightRangeTarget(heightRangeTarget uint64) error {
select {
case p.heightRangeTargetChan <- heightRangeTarget:
return nil
case <-p.cm.ShutdownSignal():
return component.ErrComponentShutdown
}
}
// SetThreshold update's the Pruner's threshold.
// This may block for the duration of a pruning operation.
func (p *Pruner) SetThreshold(threshold uint64) error {
select {
case p.thresholdChan <- threshold:
return nil
case <-p.cm.ShutdownSignal():
return component.ErrComponentShutdown
}
}
func (p *Pruner) loop(ctx irrecoverable.SignalerContext, ready component.ReadyFunc) {
ready()
for {
select {
case <-ctx.Done():
return
case height := <-p.fulfilledHeights:
if height > p.lastFulfilledHeight {
p.lastFulfilledHeight = height
}
p.checkPrune(ctx)
case heightRangeTarget := <-p.heightRangeTargetChan:
p.heightRangeTarget = heightRangeTarget
p.checkPrune(ctx)
case threshold := <-p.thresholdChan:
p.threshold = threshold
p.checkPrune(ctx)
}
}
}
func (p *Pruner) checkPrune(ctx irrecoverable.SignalerContext) {
if p.lastFulfilledHeight > p.heightRangeTarget+p.threshold+p.lastPrunedHeight {
pruneHeight := p.lastFulfilledHeight - p.heightRangeTarget
p.logger.Info().Uint64("prune_height", pruneHeight).Msg("pruning storage")
start := time.Now()
if err := p.storage.PruneUpToHeight(pruneHeight); err != nil {
ctx.Throw(fmt.Errorf("failed to prune: %w", err))
}
if err := p.pruneCallback(ctx); err != nil {
ctx.Throw(err)
}
duration := time.Since(start)
p.logger.Info().Dur("duration", duration).Msg("pruned storage")
p.metrics.Pruned(pruneHeight, duration)
p.lastPrunedHeight = pruneHeight
}
}