mirror of https://github.com/minio/minio.git
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package main
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import (
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"path"
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"sync"
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)
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// This function does the following check, suppose
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// object is "a/b/c/d", stat makes sure that objects ""a/b/c""
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// "a/b" and "a" do not exist.
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func (xl xlObjects) parentDirIsObject(bucket, parent string) bool {
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var isParentDirObject func(string) bool
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isParentDirObject = func(p string) bool {
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if p == "." {
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return false
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}
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if xl.isObject(bucket, p) {
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// If there is already a file at prefix "p" return error.
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return true
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}
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// Check if there is a file as one of the parent paths.
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return isParentDirObject(path.Dir(p))
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}
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return isParentDirObject(parent)
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}
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func (xl xlObjects) isObject(bucket, prefix string) bool {
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// Create errs and volInfo slices of storageDisks size.
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var errs = make([]error, len(xl.storageDisks))
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// Allocate a new waitgroup.
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var wg = &sync.WaitGroup{}
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for index, disk := range xl.storageDisks {
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wg.Add(1)
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// Stat file on all the disks in a routine.
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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_, err := disk.StatFile(bucket, path.Join(prefix, xlMetaJSONFile))
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if err != nil {
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errs[index] = err
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return
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}
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errs[index] = nil
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}(index, disk)
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}
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// Wait for all the Stat operations to finish.
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wg.Wait()
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var errFileNotFoundCount int
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for _, err := range errs {
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if err != nil {
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if err == errFileNotFound {
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errFileNotFoundCount++
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// If we have errors with file not found greater than allowed read
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// quorum we return err as errFileNotFound.
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if errFileNotFoundCount > len(xl.storageDisks)-xl.readQuorum {
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return false
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}
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continue
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}
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errorIf(err, "Unable to access file "+path.Join(bucket, prefix))
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return false
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}
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}
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return true
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}
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// statPart - stat a part file.
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func (xl xlObjects) statPart(bucket, objectPart string) (fileInfo FileInfo, err error) {
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// Count for errors encountered.
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var xlJSONErrCount = 0
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// Return the first success entry based on the selected random disk.
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for xlJSONErrCount < len(xl.storageDisks) {
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// Choose a random disk on each attempt.
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disk := xl.getRandomDisk()
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fileInfo, err = disk.StatFile(bucket, objectPart)
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if err == nil {
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return fileInfo, nil
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}
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xlJSONErrCount++ // Update error count.
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}
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return FileInfo{}, err
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}
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