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registers_cache.go
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/
registers_cache.go
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package pebble
import (
"fmt"
"github.com/pkg/errors"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/module"
"github.com/onflow/flow-go/storage"
)
const (
registerResourceName = "registers"
)
type RegistersCache struct {
*Registers
cache *ReadCache
}
var _ storage.RegisterIndex = (*RegistersCache)(nil)
// NewRegistersCache wraps a read cache around Get requests to a underlying Registers object.
func NewRegistersCache(registers *Registers, cacheType CacheType, size uint, metrics module.CacheMetrics) (*RegistersCache, error) {
if size == 0 {
return nil, errors.New("cache size cannot be 0")
}
cache, err := newReadCache(
metrics,
registerResourceName,
cacheType,
size,
func(key string) (flow.RegisterValue, error) {
return registers.lookupRegister([]byte(key))
},
)
if err != nil {
return nil, fmt.Errorf("could not create cache: %w", err)
}
return &RegistersCache{
Registers: registers,
cache: cache,
}, nil
}
// Get returns the most recent updated payload for the given RegisterID.
// "most recent" means the updates happens most recent up the given height.
//
// For example, if there are 2 values stored for register A at height 6 and 11, then
// GetPayload(13, A) would return the value at height 11.
//
// - storage.ErrNotFound if no register values are found
// - storage.ErrHeightNotIndexed if the requested height is out of the range of stored heights
func (c *RegistersCache) Get(
reg flow.RegisterID,
height uint64,
) (flow.RegisterValue, error) {
return c.cache.Get(newLookupKey(height, reg).String())
}