frostfs-node/pkg/local_object_storage/writecache/get.go

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package writecache
import (
"bytes"
"context"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"go.etcd.io/bbolt"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
// Get returns object from write-cache.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in write-cache.
func (c *cache) Get(ctx context.Context, addr oid.Address) (*objectSDK.Object, error) {
saddr := addr.EncodeToString()
ctx, span := tracing.StartSpanFromContext(ctx, "writecache.Get",
trace.WithAttributes(
attribute.String("address", saddr),
))
defer span.End()
if !c.modeMtx.TryRLock() {
return nil, ErrNotInitialized
}
defer c.modeMtx.RUnlock()
if c.mode.NoMetabase() {
return nil, ErrDegraded
}
obj, err := c.getInternal(ctx, addr)
return obj, metaerr.Wrap(err)
}
func (c *cache) getInternal(ctx context.Context, addr oid.Address) (*objectSDK.Object, error) {
found := false
storageType := StorageTypeUndefined
startedAt := time.Now()
defer func() {
c.metrics.Get(time.Since(startedAt), found, storageType)
}()
res, err := c.fsTree.Get(ctx, common.GetPrm{Address: addr})
if err != nil {
return nil, logicerr.Wrap(new(apistatus.ObjectNotFound))
}
found = true
storageType = StorageTypeFSTree
return res.Object, nil
}
// Head returns object header from write-cache.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in write-cache.
func (c *cache) Head(ctx context.Context, addr oid.Address) (*objectSDK.Object, error) {
saddr := addr.EncodeToString()
ctx, span := tracing.StartSpanFromContext(ctx, "Head",
trace.WithAttributes(
attribute.String("address", saddr),
))
defer span.End()
if !c.modeMtx.TryRLock() {
return nil, ErrNotInitialized
}
defer c.modeMtx.RUnlock()
if c.mode.NoMetabase() {
return nil, ErrDegraded
}
obj, err := c.getInternal(ctx, addr)
if err != nil {
return nil, metaerr.Wrap(err)
}
return obj.CutPayload(), nil
}
// Get fetches object from the underlying database.
// Key should be a stringified address.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in db.
func Get(db *bbolt.DB, key []byte) ([]byte, error) {
if db == nil {
return nil, ErrNotInitialized
}
var value []byte
err := db.View(func(tx *bbolt.Tx) error {
b := tx.Bucket(defaultBucket)
if b == nil {
return ErrNoDefaultBucket
}
value = b.Get(key)
if value == nil {
return logicerr.Wrap(new(apistatus.ObjectNotFound))
}
value = bytes.Clone(value)
return nil
})
return value, metaerr.Wrap(err)
}