mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-28 18:05:24 +01:00
137 lines
3.2 KiB
Go
137 lines
3.2 KiB
Go
package common
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import (
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"fmt"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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// Part is an atomic unit for transfer during backup / restore.
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//
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// Each source file can be split into parts with up to MaxPartSize sizes.
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type Part struct {
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// Path is the path to file for backup.
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Path string
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// FileSize is the size of the whole file for the given part.
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FileSize uint64
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// Offset is offset in the file to backup.
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Offset uint64
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// Size is the size of the part to backup starting from Offset.
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Size uint64
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// ActualSize is the actual size of the part.
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//
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// The part is considered broken if it isn't equal to Size.
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// Such a part must be removed from remote storage.
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ActualSize uint64
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}
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func (p *Part) key() string {
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return fmt.Sprintf("%s%016X%016X%016X%016X", p.Path, p.FileSize, p.Offset, p.Size, p.ActualSize)
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}
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// String returns human-readable representation of the part.
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func (p *Part) String() string {
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return fmt.Sprintf("part{path: %q, file_size: %d, offset: %d, size: %d}", p.Path, p.FileSize, p.Offset, p.Size)
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}
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// RemotePath returns remote path for the part p and the given prefix.
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func (p *Part) RemotePath(prefix string) string {
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for strings.HasSuffix(prefix, "/") {
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prefix = prefix[:len(prefix)-1]
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}
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return fmt.Sprintf("%s/%s/%016X_%016X_%016X", prefix, p.Path, p.FileSize, p.Offset, p.Size)
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}
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var partNameRegexp = regexp.MustCompile(`^(.+)/([0-9A-F]{16})_([0-9A-F]{16})_([0-9A-F]{16})$`)
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// ParseFromRemotePath parses p from remotePath.
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//
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// Returns true on success.
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func (p *Part) ParseFromRemotePath(remotePath string) bool {
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tmp := partNameRegexp.FindStringSubmatch(remotePath)
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if len(tmp) != 5 {
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return false
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}
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path := tmp[1]
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for strings.HasPrefix(path, "/") {
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path = path[1:]
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}
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fileSize, err := strconv.ParseUint(tmp[2], 16, 64)
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if err != nil {
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logger.Panicf("BUG: cannot parse fileSize from %q: %s", tmp[2], err)
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}
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offset, err := strconv.ParseUint(tmp[3], 16, 64)
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if err != nil {
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logger.Panicf("BUG: cannot parse offset from %q: %s", tmp[3], err)
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}
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size, err := strconv.ParseUint(tmp[4], 16, 64)
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if err != nil {
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logger.Panicf("BUG: cannot parse size from %q: %s", tmp[4], err)
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}
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p.Path = path
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p.FileSize = fileSize
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p.Offset = offset
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p.Size = size
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return true
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}
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// MaxPartSize is the maximum size for each part.
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//
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// The MaxPartSize reduces bandwidth usage during retires on network errors
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// when transferring multi-TB files.
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const MaxPartSize = 128 * 1024 * 1024
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// SortParts sorts parts by (Path, Offset)
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func SortParts(parts []Part) {
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sort.Slice(parts, func(i, j int) bool {
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a := parts[i]
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b := parts[j]
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if a.Path != b.Path {
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return a.Path < b.Path
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}
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return a.Offset < b.Offset
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})
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}
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// PartsDifference returns a - b
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func PartsDifference(a, b []Part) []Part {
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m := make(map[string]bool, len(b))
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for _, p := range b {
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k := p.key()
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m[k] = true
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}
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var d []Part
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for _, p := range a {
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k := p.key()
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if !m[k] {
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d = append(d, p)
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}
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}
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return d
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}
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// PartsIntersect returns the intersection of a and b
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func PartsIntersect(a, b []Part) []Part {
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m := make(map[string]bool, len(a))
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for _, p := range a {
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k := p.key()
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m[k] = true
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}
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var d []Part
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for _, p := range b {
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k := p.key()
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if m[k] {
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d = append(d, p)
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}
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}
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return d
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}
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