restic/checker/checker.go

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package checker
import (
"encoding/hex"
"github.com/restic/restic/backend"
"github.com/restic/restic/debug"
"github.com/restic/restic/repository"
)
// Error is an error in the repository detected by the checker.
type Error struct {
Message string
Err error
}
func (e Error) Error() string {
if e.Err != nil {
return e.Message + ": " + e.Err.Error()
}
return e.Message
}
type mapID [backend.IDSize]byte
func id2map(id backend.ID) (mid mapID) {
copy(mid[:], id)
return
}
func str2map(s string) (mid mapID, err error) {
data, err := hex.DecodeString(s)
if err != nil {
return mid, err
}
return id2map(data), nil
}
// Checker runs various checks on a repository. It is advisable to create an
// exclusive Lock in the repository before running any checks.
//
// A Checker only tests for internal errors within the data structures of the
// repository (e.g. missing blobs), and needs a valid Repository to work on.
type Checker struct {
packs map[mapID]struct{}
blobs map[mapID]struct{}
blobRefs map[mapID]uint
indexes map[mapID]*repository.Index
masterIndex *repository.Index
repo *repository.Repository
}
// New returns a new checker which runs on repo.
func New(repo *repository.Repository) *Checker {
return &Checker{
blobRefs: make(map[mapID]uint),
packs: make(map[mapID]struct{}),
blobs: make(map[mapID]struct{}),
masterIndex: repository.NewIndex(),
indexes: make(map[mapID]*repository.Index),
repo: repo,
}
}
const loadIndexParallelism = 20
// LoadIndex loads all index files.
func (c *Checker) LoadIndex() error {
debug.Log("LoadIndex", "Start")
type indexRes struct {
Index *repository.Index
ID string
}
indexCh := make(chan indexRes)
worker := func(id string, done <-chan struct{}) error {
debug.Log("LoadIndex", "worker got index %v", id)
idx, err := repository.LoadIndex(c.repo, id)
if err != nil {
return err
}
select {
case indexCh <- indexRes{Index: idx, ID: id}:
case <-done:
}
return nil
}
var perr error
go func() {
defer close(indexCh)
debug.Log("LoadIndex", "start loading indexes in parallel")
perr = repository.FilesInParallel(c.repo.Backend(), backend.Index, loadIndexParallelism, worker)
debug.Log("LoadIndex", "loading indexes finished, error: %v", perr)
}()
done := make(chan struct{})
defer close(done)
for res := range indexCh {
debug.Log("LoadIndex", "process index %v", res.ID)
id, err := str2map(res.ID)
if err != nil {
return err
}
c.indexes[id] = res.Index
c.masterIndex.Merge(res.Index)
debug.Log("LoadIndex", "process blobs")
cnt := 0
for blob := range res.Index.Each(done) {
c.packs[id2map(blob.PackID)] = struct{}{}
c.blobs[id2map(blob.ID)] = struct{}{}
c.blobRefs[id2map(blob.ID)] = 0
cnt++
}
debug.Log("LoadIndex", "%d blobs processed", cnt)
}
debug.Log("LoadIndex", "done, error %v", perr)
return perr
}
// Packs checks that all packs referenced in the index are still available.
func (c *Checker) Packs() error {
return nil
}