mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 21:07:18 +00:00
82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
package cache
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import (
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"sync"
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lru "github.com/hashicorp/golang-lru"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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iface "github.com/prysmaticlabs/prysm/beacon-chain/state/interface"
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"github.com/prysmaticlabs/prysm/shared/hashutil"
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)
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var (
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// maxCheckpointStateSize defines the max number of entries check point to state cache can contain.
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// Choosing 10 to account for multiple forks, this allows 5 forks per epoch boundary with 2 epochs
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// window to accept attestation based on latest spec.
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maxCheckpointStateSize = 10
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// Metrics.
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checkpointStateMiss = promauto.NewCounter(prometheus.CounterOpts{
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Name: "check_point_state_cache_miss",
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Help: "The number of check point state requests that aren't present in the cache.",
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})
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checkpointStateHit = promauto.NewCounter(prometheus.CounterOpts{
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Name: "check_point_state_cache_hit",
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Help: "The number of check point state requests that are present in the cache.",
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})
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)
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// CheckpointStateCache is a struct with 1 queue for looking up state by checkpoint.
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type CheckpointStateCache struct {
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cache *lru.Cache
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lock sync.RWMutex
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}
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// NewCheckpointStateCache creates a new checkpoint state cache for storing/accessing processed state.
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func NewCheckpointStateCache() *CheckpointStateCache {
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cache, err := lru.New(maxCheckpointStateSize)
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if err != nil {
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panic(err)
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}
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return &CheckpointStateCache{
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cache: cache,
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}
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}
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// StateByCheckpoint fetches state by checkpoint. Returns true with a
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// reference to the CheckpointState info, if exists. Otherwise returns false, nil.
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func (c *CheckpointStateCache) StateByCheckpoint(cp *ethpb.Checkpoint) (iface.BeaconState, error) {
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c.lock.RLock()
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defer c.lock.RUnlock()
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h, err := hashutil.HashProto(cp)
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if err != nil {
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return nil, err
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}
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item, exists := c.cache.Get(h)
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if exists && item != nil {
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checkpointStateHit.Inc()
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// Copy here is unnecessary since the return will only be used to verify attestation signature.
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return item.(iface.BeaconState), nil
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}
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checkpointStateMiss.Inc()
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return nil, nil
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}
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// AddCheckpointState adds CheckpointState object to the cache. This method also trims the least
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// recently added CheckpointState object if the cache size has ready the max cache size limit.
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func (c *CheckpointStateCache) AddCheckpointState(cp *ethpb.Checkpoint, s iface.ReadOnlyBeaconState) error {
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c.lock.Lock()
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defer c.lock.Unlock()
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h, err := hashutil.HashProto(cp)
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if err != nil {
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return err
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}
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c.cache.Add(h, s)
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return nil
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}
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