mirror of https://github.com/etcd-io/bbolt.git
103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
package surgeon
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// Library contains raw access to bbolt files for sake of testing or fixing of corrupted files.
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//
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// The library must not be used bbolt btree - just by CLI or tests.
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// It's not optimized for performance.
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import (
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"bytes"
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"fmt"
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"go.etcd.io/bbolt/internal/common"
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"go.etcd.io/bbolt/internal/guts_cli"
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)
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type XRay struct {
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path string
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}
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func NewXRay(path string) XRay {
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return XRay{path}
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}
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func (n XRay) traverse(stack []common.Pgid, callback func(page *common.Page, stack []common.Pgid) error) error {
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p, data, err := guts_cli.ReadPage(n.path, uint64(stack[len(stack)-1]))
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if err != nil {
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return fmt.Errorf("failed reading page (stack %v): %w", stack, err)
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}
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err = callback(p, stack)
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if err != nil {
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return fmt.Errorf("failed callback for page (stack %v): %w", stack, err)
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}
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switch p.Typ() {
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case "meta":
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{
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m := common.LoadPageMeta(data)
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r := m.RootBucket().RootPage()
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return n.traverse(append(stack, r), callback)
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}
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case "branch":
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{
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for i := uint16(0); i < p.Count(); i++ {
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bpe := p.BranchPageElement(i)
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if err := n.traverse(append(stack, bpe.Pgid()), callback); err != nil {
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return err
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}
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}
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}
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case "leaf":
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for i := uint16(0); i < p.Count(); i++ {
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lpe := p.LeafPageElement(i)
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if lpe.IsBucketEntry() {
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pgid := lpe.Bucket().RootPage()
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if pgid > 0 {
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if err := n.traverse(append(stack, pgid), callback); err != nil {
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return err
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}
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} else {
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inlinePage := lpe.Bucket().InlinePage(lpe.Value())
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if err := callback(inlinePage, stack); err != nil {
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return fmt.Errorf("failed callback for inline page (stack %v): %w", stack, err)
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}
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}
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}
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}
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case "freelist":
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return nil
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// Free does not have children.
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}
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return nil
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}
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// FindPathsToKey finds all paths from root to the page that contains the given key.
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// As it traverses multiple buckets, so in theory there might be multiple keys with the given name.
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// Note: For simplicity it's currently implemented as traversing of the whole reachable tree.
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// If key is a bucket name, a page-path referencing the key will be returned as well.
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func (n XRay) FindPathsToKey(key []byte) ([][]common.Pgid, error) {
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var found [][]common.Pgid
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rootPage, _, err := guts_cli.GetRootPage(n.path)
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if err != nil {
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return nil, err
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}
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err = n.traverse([]common.Pgid{rootPage},
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func(page *common.Page, stack []common.Pgid) error {
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if page.Typ() == "leaf" {
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for i := uint16(0); i < page.Count(); i++ {
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if bytes.Equal(page.LeafPageElement(i).Key(), key) {
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var copyPath []common.Pgid
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copyPath = append(copyPath, stack...)
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found = append(found, copyPath)
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}
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}
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}
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return nil
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})
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if err != nil {
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return nil, err
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} else {
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return found, nil
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}
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}
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