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d962568e93
This will simplify examining the returned errors such as httpserver.ErrorWithStatusCode . See https://blog.golang.org/go1.13-errors for details.
117 lines
3.2 KiB
Go
117 lines
3.2 KiB
Go
package storage
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import (
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"fmt"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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)
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// partHeader represents part header.
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type partHeader struct {
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// RowsCount is the total number of rows in the part.
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RowsCount uint64
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// BlocksCount is the total number of blocks in the part.
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BlocksCount uint64
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// MinTimestamp is the minimum timestamp in the part.
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MinTimestamp int64
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// MaxTimestamp is the maximum timestamp in the part.
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MaxTimestamp int64
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}
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// String returns string representation of ph.
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func (ph *partHeader) String() string {
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return fmt.Sprintf("%d_%d_%s_%s", ph.RowsCount, ph.BlocksCount, toUserReadableTimestamp(ph.MinTimestamp), toUserReadableTimestamp(ph.MaxTimestamp))
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}
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func toUserReadableTimestamp(timestamp int64) string {
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t := timestampToTime(timestamp)
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return t.Format(userReadableTimeFormat)
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}
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func fromUserReadableTimestamp(s string) (int64, error) {
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t, err := time.Parse(userReadableTimeFormat, s)
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if err != nil {
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return 0, err
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}
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return timestampFromTime(t), nil
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}
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const userReadableTimeFormat = "20060102150405.000"
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// Path returns a path to part header with the given prefix and suffix.
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//
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// Suffix must be random.
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func (ph *partHeader) Path(prefix string, suffix uint64) string {
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prefix = filepath.Clean(prefix)
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s := ph.String()
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return fmt.Sprintf("%s/%s_%016X", prefix, s, suffix)
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}
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// ParseFromPath extracts ph info from the given path.
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func (ph *partHeader) ParseFromPath(path string) error {
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ph.Reset()
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path = filepath.Clean(path)
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// Extract encoded part name.
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n := strings.LastIndexByte(path, '/')
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if n < 0 {
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return fmt.Errorf("cannot find encoded part name in the path %q", path)
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}
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partName := path[n+1:]
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// PartName must have the following form:
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// RowsCount_BlocksCount_MinTimestamp_MaxTimestamp_Garbage
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a := strings.Split(partName, "_")
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if len(a) != 5 {
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return fmt.Errorf("unexpected number of substrings in the part name %q: got %d; want %d", partName, len(a), 5)
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}
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var err error
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ph.RowsCount, err = strconv.ParseUint(a[0], 10, 64)
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if err != nil {
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return fmt.Errorf("cannot parse rowsCount from partName %q: %w", partName, err)
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}
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ph.BlocksCount, err = strconv.ParseUint(a[1], 10, 64)
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if err != nil {
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return fmt.Errorf("cannot parse blocksCount from partName %q: %w", partName, err)
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}
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ph.MinTimestamp, err = fromUserReadableTimestamp(a[2])
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if err != nil {
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return fmt.Errorf("cannot parse minTimestamp from partName %q: %w", partName, err)
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}
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ph.MaxTimestamp, err = fromUserReadableTimestamp(a[3])
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if err != nil {
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return fmt.Errorf("cannot parse maxTimestamp from partName %q: %w", partName, err)
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}
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if ph.MinTimestamp > ph.MaxTimestamp {
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return fmt.Errorf("minTimestamp cannot exceed maxTimestamp; got %d vs %d", ph.MinTimestamp, ph.MaxTimestamp)
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}
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if ph.RowsCount <= 0 {
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return fmt.Errorf("rowsCount must be greater than 0; got %d", ph.RowsCount)
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}
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if ph.BlocksCount <= 0 {
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return fmt.Errorf("blocksCount must be greater than 0; got %d", ph.BlocksCount)
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}
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if ph.BlocksCount > ph.RowsCount {
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return fmt.Errorf("blocksCount cannot be bigger than rowsCount; got blocksCount=%d, rowsCount=%d", ph.BlocksCount, ph.RowsCount)
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}
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return nil
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}
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// Reset resets the ph.
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func (ph *partHeader) Reset() {
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ph.RowsCount = 0
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ph.BlocksCount = 0
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ph.MinTimestamp = (1 << 63) - 1
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ph.MaxTimestamp = -1 << 63
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}
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