93 lines
2.0 KiB
Go
93 lines
2.0 KiB
Go
package ipldstore
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"fmt"
|
|
|
|
"github.com/filecoin-project/lotus/tools/stats/metrics"
|
|
|
|
lru "github.com/hashicorp/golang-lru"
|
|
"github.com/ipfs/go-cid"
|
|
cbg "github.com/whyrusleeping/cbor-gen"
|
|
"go.opencensus.io/stats"
|
|
)
|
|
|
|
type ApiIpldStore struct {
|
|
ctx context.Context
|
|
api apiIpldStoreApi
|
|
cache *lru.TwoQueueCache
|
|
cacheSize int
|
|
}
|
|
|
|
type apiIpldStoreApi interface {
|
|
ChainReadObj(context.Context, cid.Cid) ([]byte, error)
|
|
}
|
|
|
|
func NewApiIpldStore(ctx context.Context, api apiIpldStoreApi, cacheSize int) (*ApiIpldStore, error) {
|
|
store := &ApiIpldStore{
|
|
ctx: ctx,
|
|
api: api,
|
|
cacheSize: cacheSize,
|
|
}
|
|
|
|
cache, err := lru.New2Q(store.cacheSize)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
store.cache = cache
|
|
|
|
return store, nil
|
|
}
|
|
|
|
func (ht *ApiIpldStore) Context() context.Context {
|
|
return ht.ctx
|
|
}
|
|
|
|
func (ht *ApiIpldStore) read(ctx context.Context, c cid.Cid) ([]byte, error) {
|
|
stats.Record(ctx, metrics.IpldStoreCacheMiss.M(1))
|
|
done := metrics.Timer(ctx, metrics.IpldStoreReadDuration)
|
|
defer done()
|
|
return ht.api.ChainReadObj(ctx, c)
|
|
}
|
|
|
|
func (ht *ApiIpldStore) Get(ctx context.Context, c cid.Cid, out interface{}) error {
|
|
done := metrics.Timer(ctx, metrics.IpldStoreGetDuration)
|
|
defer done()
|
|
defer func() {
|
|
stats.Record(ctx, metrics.IpldStoreCacheSize.M(int64(ht.cacheSize)))
|
|
stats.Record(ctx, metrics.IpldStoreCacheLength.M(int64(ht.cache.Len())))
|
|
}()
|
|
|
|
var raw []byte
|
|
|
|
if a, ok := ht.cache.Get(c); ok {
|
|
stats.Record(ctx, metrics.IpldStoreCacheHit.M(1))
|
|
raw = a.([]byte)
|
|
} else {
|
|
bs, err := ht.read(ctx, c)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
raw = bs
|
|
}
|
|
|
|
cu, ok := out.(cbg.CBORUnmarshaler)
|
|
if ok {
|
|
if err := cu.UnmarshalCBOR(bytes.NewReader(raw)); err != nil {
|
|
return err
|
|
}
|
|
|
|
ht.cache.Add(c, raw)
|
|
return nil
|
|
}
|
|
|
|
return fmt.Errorf("Object does not implement CBORUnmarshaler")
|
|
}
|
|
|
|
func (ht *ApiIpldStore) Put(ctx context.Context, v interface{}) (cid.Cid, error) {
|
|
return cid.Undef, fmt.Errorf("Put is not implemented on ApiIpldStore")
|
|
}
|