Example #1
0
func (l *Layer) GetFilesByLocation(id [16]byte, count int) ([]File, error) {
	var rang kvl.RangeQuery
	rang.Low, rang.High = keys.PrefixRange(tuple.MustAppend(nil,
		"file", "location", id))
	rang.Limit = count

	ps, err := l.index.Range(rang)
	if err != nil {
		return nil, err
	}

	fs := make([]File, 0, len(ps))

	for _, p := range ps {
		var typ, detail, path string
		var loc [16]byte
		err := tuple.UnpackInto(p.Key, &typ, &detail, &loc, &path)
		if err != nil {
			return nil, err
		}

		f, err := l.GetFile(path)
		if err != nil {
			return nil, err
		}

		if f != nil {
			fs = append(fs, *f)
		}
	}

	return fs, nil
}
Example #2
0
func (l *Layer) AllLocations() ([]Location, error) {
	var query kvl.RangeQuery
	key, _ := tuple.Append(nil, "location")
	query.Low, query.High = keys.PrefixRange(key)

	pairs, err := l.inner.Range(query)
	if err != nil {
		return nil, err
	}

	locations := make([]Location, len(pairs))
	for i, pair := range pairs {
		err := locations[i].fromPair(pair)
		if err != nil {
			return nil, err
		}
	}

	return locations, nil
}
Example #3
0
func (l *Layer) WALClearOld() error {
	var rang kvl.RangeQuery
	rang.Low, rang.High = keys.PrefixRange(tuple.MustAppend(nil, "wal2"))
	rang.Limit = 100

	for {
		ps, err := l.inner.Range(rang)
		if err != nil {
			return err
		}

		now := time.Now().Unix()

		for _, p := range ps {
			var typ string
			var id [16]byte
			err = tuple.UnpackInto(p.Key, &typ, &id)
			if err != nil {
				return err
			}

			timestamps, err := walParse(p.Value)
			if err != nil {
				return err
			}

			newestAge := time.Duration(now-timestamps[len(timestamps)-1]) * time.Second
			oldestAge := time.Duration(now-timestamps[0]) * time.Second

			if newestAge < -walUnsafeFutureAge {
				log.Printf("WARNING: WAL entry %v is %v in the future! Skipping it.",
					uuid.Fmt(id), newestAge)
			} else if oldestAge > walUnsafeOldAge {
				log.Printf("WARNING: WAL entry %v is %v in the past! Skipping it.",
					uuid.Fmt(id), oldestAge)
			} else if oldestAge > walExpireAge {
				log.Printf("Removing expired WAL entry %v (%v old)",
					uuid.Fmt(id), oldestAge)

				// Remove the oldest timestamp (only); we'll get to the other timestamps
				// in future passes if needed.
				timestamps = timestamps[1:]

				if len(timestamps) == 0 {
					err = l.inner.Delete(p.Key)
					if err != nil {
						return err
					}
				} else {
					err = l.inner.Set(kvl.Pair{p.Key, walDump(timestamps)})
					if err != nil {
						return err
					}
				}
			}
		}

		if len(ps) < rang.Limit {
			break
		}

		rang.Low = ps[len(ps)-1].Key
	}

	return nil
}