frostfs-node/pkg/local_object_storage/engine/select.go
Alex Vanin ee1e3931a5 [#231] engine: Add List method
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2020-12-11 17:19:37 +03:00

127 lines
3.3 KiB
Go

package engine
import (
"github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
"go.uber.org/zap"
)
// SelectPrm groups the parameters of Select operation.
type SelectPrm struct {
filters object.SearchFilters
}
// SelectRes groups resulting values of Select operation.
type SelectRes struct {
addrList []*object.Address
}
// WithFilters is a Select option to set the object filters.
func (p *SelectPrm) WithFilters(fs object.SearchFilters) *SelectPrm {
if p != nil {
p.filters = fs
}
return p
}
// AddressList returns list of addresses of the selected objects.
func (r *SelectRes) AddressList() []*object.Address {
return r.addrList
}
// Select selects the objects from local storage that match select parameters.
//
// Returns any error encountered that did not allow to completely select the objects.
func (e *StorageEngine) Select(prm *SelectPrm) (*SelectRes, error) {
addrList := make([]*object.Address, 0)
uniqueMap := make(map[string]struct{})
shPrm := new(shard.SelectPrm).
WithFilters(prm.filters)
e.iterateOverUnsortedShards(func(sh *shard.Shard) (stop bool) {
res, err := sh.Select(shPrm)
if err != nil {
// TODO: smth wrong with shard, need to be processed
e.log.Warn("could not select objects from shard",
zap.Stringer("shard", sh.ID()),
zap.String("error", err.Error()),
)
} else {
for _, addr := range res.AddressList() { // save only unique values
if _, ok := uniqueMap[addr.String()]; !ok {
uniqueMap[addr.String()] = struct{}{}
addrList = append(addrList, addr)
}
}
}
return false
})
return &SelectRes{
addrList: addrList,
}, nil
}
// List returns `limit` available physically storage object addresses in engine.
// If limit is zero, then returns all available object addresses.
func (e *StorageEngine) List(limit uint64) (*SelectRes, error) {
addrList := make([]*object.Address, limit)
uniqueMap := make(map[string]struct{})
ln := uint64(0)
// consider iterating over shuffled shards
e.iterateOverUnsortedShards(func(sh *shard.Shard) (stop bool) {
res, err := sh.List() // consider limit result of shard iterator
if err != nil {
// TODO: smth wrong with shard, need to be processed
e.log.Warn("could not select objects from shard",
zap.Stringer("shard", sh.ID()),
zap.String("error", err.Error()),
)
} else {
for _, addr := range res.AddressList() { // save only unique values
if _, ok := uniqueMap[addr.String()]; !ok {
uniqueMap[addr.String()] = struct{}{}
addrList = append(addrList, addr)
ln++
if limit > 0 && ln >= limit {
return true
}
}
}
}
return false
})
return &SelectRes{
addrList: addrList,
}, nil
}
// Select selects objects from local storage using provided filters.
func Select(storage *StorageEngine, fs object.SearchFilters) ([]*object.Address, error) {
res, err := storage.Select(new(SelectPrm).
WithFilters(fs),
)
if err != nil {
return nil, err
}
return res.AddressList(), nil
}
// List returns `limit` available physically storage object addresses in
// engine. If limit is zero, then returns all available object addresses.
func List(storage *StorageEngine, limit uint64) ([]*object.Address, error) {
res, err := storage.List(limit)
if err != nil {
return nil, err
}
return res.AddressList(), nil
}