mirror of
https://github.com/nspcc-dev/neo-go.git
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102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
package server
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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"github.com/nspcc-dev/neo-go/pkg/core/storage/dboper"
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)
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type dump []blockDump
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type blockDump struct {
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Block uint32 `json:"block"`
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Size int `json:"size"`
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Storage []dboper.Operation `json:"storage"`
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}
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func newDump() *dump {
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return new(dump)
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}
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func (d *dump) add(index uint32, batch *storage.MemBatch) {
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ops := storage.BatchToOperations(batch)
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*d = append(*d, blockDump{
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Block: index,
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Size: len(ops),
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Storage: ops,
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})
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}
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func (d *dump) tryPersist(prefix string, index uint32) error {
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if len(*d) == 0 {
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return nil
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}
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path, err := getPath(prefix, index)
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if err != nil {
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return err
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}
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old, err := readFile(path)
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if err == nil {
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*old = append(*old, *d...)
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} else {
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old = d
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}
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f, err := os.Create(path)
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if err != nil {
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return err
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}
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defer f.Close()
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enc := json.NewEncoder(f)
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enc.SetIndent("", " ")
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if err := enc.Encode(*old); err != nil {
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return err
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}
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*d = (*d)[:0]
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return nil
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}
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func readFile(path string) (*dump, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return nil, err
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}
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d := newDump()
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if err := json.Unmarshal(data, d); err != nil {
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return nil, err
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}
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return d, err
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}
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// getPath returns filename for storing blocks up to index.
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// Directory structure is the following:
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// https://github.com/NeoResearch/neo-storage-audit#folder-organization-where-to-find-the-desired-block
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// Dir `BlockStorage_$DIRNO` contains blocks up to $DIRNO (from $DIRNO-100k)
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// Inside it there are files grouped by 1k blocks.
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// File dump-block-$FILENO.json contains blocks from $FILENO-999, $FILENO
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// Example: file `BlockStorage_100000/dump-block-6000.json` contains blocks from 5001 to 6000.
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func getPath(prefix string, index uint32) (string, error) {
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dirN := ((index + 99999) / 100000) * 100000
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dir := fmt.Sprintf("BlockStorage_%d", dirN)
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path := filepath.Join(prefix, dir)
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info, err := os.Stat(path)
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if os.IsNotExist(err) {
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err := os.MkdirAll(path, os.ModePerm)
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if err != nil {
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return "", err
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}
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} else if !info.IsDir() {
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return "", fmt.Errorf("file `%s` is not a directory", path)
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}
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fileN := ((index + 999) / 1000) * 1000
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file := fmt.Sprintf("dump-block-%d.json", fileN)
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return filepath.Join(path, file), nil
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}
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