package meta import ( "bytes" "encoding/binary" "encoding/hex" "io/fs" "os" "strconv" "strings" "sync" "time" v2object "github.com/nspcc-dev/neofs-api-go/v2/object" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode" "github.com/nspcc-dev/neofs-node/pkg/util/logger" "github.com/nspcc-dev/neofs-sdk-go/object" "go.etcd.io/bbolt" "go.uber.org/zap" ) type matcher struct { matchSlow func(string, []byte, string) bool matchBucket func(*bbolt.Bucket, string, string, func([]byte, []byte) error) error } // DB represents local metabase of storage node. type DB struct { *cfg modeMtx sync.RWMutex mode mode.Mode matchers map[object.SearchMatchType]matcher boltDB *bbolt.DB initialized bool } // Option is an option of DB constructor. type Option func(*cfg) type cfg struct { boltOptions *bbolt.Options // optional boltBatchSize int boltBatchDelay time.Duration info Info log *logger.Logger } func defaultCfg() *cfg { return &cfg{ info: Info{ Permission: os.ModePerm, // 0777 }, boltBatchDelay: bbolt.DefaultMaxBatchDelay, boltBatchSize: bbolt.DefaultMaxBatchSize, log: zap.L(), } } // New creates and returns new Metabase instance. func New(opts ...Option) *DB { c := defaultCfg() for i := range opts { opts[i](c) } return &DB{ cfg: c, matchers: map[object.SearchMatchType]matcher{ object.MatchUnknown: { matchSlow: unknownMatcher, matchBucket: unknownMatcherBucket, }, object.MatchStringEqual: { matchSlow: stringEqualMatcher, matchBucket: stringEqualMatcherBucket, }, object.MatchStringNotEqual: { matchSlow: stringNotEqualMatcher, matchBucket: stringNotEqualMatcherBucket, }, object.MatchCommonPrefix: { matchSlow: stringCommonPrefixMatcher, matchBucket: stringCommonPrefixMatcherBucket, }, }, } } func stringifyValue(key string, objVal []byte) string { switch key { default: return string(objVal) case v2object.FilterHeaderPayloadHash, v2object.FilterHeaderHomomorphicHash: return hex.EncodeToString(objVal) case v2object.FilterHeaderCreationEpoch, v2object.FilterHeaderPayloadLength: return strconv.FormatUint(binary.LittleEndian.Uint64(objVal), 10) } } // fromHexChar converts a hex character into its value and a success flag. func fromHexChar(c byte) (byte, bool) { switch { case '0' <= c && c <= '9': return c - '0', true case 'a' <= c && c <= 'f': return c - 'a' + 10, true case 'A' <= c && c <= 'F': return c - 'A' + 10, true } return 0, false } // destringifyValue is the reverse operation for stringify value. // The last return value returns true if the filter CAN match any value. // The second return value is true iff prefix is true and the filter value is considered // a hex-encoded string. In this case only the first (highest) bits of the last byte should be checked. func destringifyValue(key, value string, prefix bool) ([]byte, bool, bool) { switch key { default: return []byte(value), false, true case v2object.FilterHeaderPayloadHash, v2object.FilterHeaderHomomorphicHash: v, err := hex.DecodeString(value) if err != nil { if !prefix || len(value)%2 == 0 { return v, false, false } // To match the old behaviour we need to process odd length hex strings, such as 'abc' last, ok := fromHexChar(value[len(value)-1]) if !ok { return v, false, false } v := make([]byte, hex.DecodedLen(len(value)-1)+1) _, err := hex.Decode(v, []byte(value[:len(value)-1])) if err != nil { return nil, false, false } v[len(v)-1] = last return v, true, true } return v, false, err == nil case v2object.FilterHeaderCreationEpoch, v2object.FilterHeaderPayloadLength: u, err := strconv.ParseUint(value, 10, 64) if err != nil { return nil, false, false } raw := make([]byte, 8) binary.LittleEndian.PutUint64(raw, u) return raw, false, true } } func stringEqualMatcher(key string, objVal []byte, filterVal string) bool { return stringifyValue(key, objVal) == filterVal } func stringEqualMatcherBucket(b *bbolt.Bucket, fKey string, fValue string, f func([]byte, []byte) error) error { // Ignore the second return value because we check for strict equality. val, _, ok := destringifyValue(fKey, fValue, false) if !ok { return nil } if data := b.Get(val); data != nil { return f(val, data) } if b.Bucket(val) != nil { return f(val, nil) } return nil } func stringNotEqualMatcher(key string, objVal []byte, filterVal string) bool { return stringifyValue(key, objVal) != filterVal } func stringNotEqualMatcherBucket(b *bbolt.Bucket, fKey string, fValue string, f func([]byte, []byte) error) error { // Ignore the second return value because we check for strict inequality. val, _, ok := destringifyValue(fKey, fValue, false) return b.ForEach(func(k, v []byte) error { if !ok || !bytes.Equal(val, k) { return f(k, v) } return nil }) } func stringCommonPrefixMatcher(key string, objVal []byte, filterVal string) bool { return strings.HasPrefix(stringifyValue(key, objVal), filterVal) } func stringCommonPrefixMatcherBucket(b *bbolt.Bucket, fKey string, fVal string, f func([]byte, []byte) error) error { val, checkLast, ok := destringifyValue(fKey, fVal, true) if !ok { return nil } prefix := val if checkLast { prefix = val[:len(val)-1] } c := b.Cursor() for k, v := c.Seek(val); bytes.HasPrefix(k, prefix); k, v = c.Next() { if checkLast && (len(k) == len(prefix) || k[len(prefix)]>>4 != val[len(val)-1]) { // If the last byte doesn't match, this means the prefix does no longer match, // so we need to break here. break } if err := f(k, v); err != nil { return err } } return nil } func unknownMatcher(_ string, _ []byte, _ string) bool { return false } func unknownMatcherBucket(_ *bbolt.Bucket, _ string, _ string, _ func([]byte, []byte) error) error { return nil } // bucketKeyHelper returns byte representation of val that is used as a key // in boltDB. Useful for getting filter values from unique and list indexes. func bucketKeyHelper(hdr string, val string) []byte { switch hdr { case v2object.FilterHeaderPayloadHash: v, err := hex.DecodeString(val) if err != nil { return nil } return v case v2object.FilterHeaderSplitID: s := object.NewSplitID() err := s.Parse(val) if err != nil { return nil } return s.ToV2() default: return []byte(val) } } // SetLogger sets logger. It is used after the shard ID was generated to use it in logs. func (db *DB) SetLogger(l *zap.Logger) { db.log = l } // WithLogger returns option to set logger of DB. func WithLogger(l *logger.Logger) Option { return func(c *cfg) { c.log = l } } // WithBoltDBOptions returns option to specify BoltDB options. func WithBoltDBOptions(opts *bbolt.Options) Option { return func(c *cfg) { c.boltOptions = opts } } // WithPath returns option to set system path to Metabase. func WithPath(path string) Option { return func(c *cfg) { c.info.Path = path } } // WithPermissions returns option to specify permission bits // of Metabase system path. func WithPermissions(perm fs.FileMode) Option { return func(c *cfg) { c.info.Permission = perm } } // WithMaxBatchSize returns option to specify maximum concurrent operations // to be processed in a single transactions. // This option is missing from `bbolt.Options` but is set right after DB is open. func WithMaxBatchSize(s int) Option { return func(c *cfg) { if s != 0 { c.boltBatchSize = s } } } // WithMaxBatchDelay returns option to specify maximum time to wait before // the batch of concurrent transactions is processed. // This option is missing from `bbolt.Options` but is set right after DB is open. func WithMaxBatchDelay(d time.Duration) Option { return func(c *cfg) { if d != 0 { c.boltBatchDelay = d } } }