forked from cerc-io/plugeth
538a868384
* core/rawdb, cmd, ethdb, eth: implement freezer tail deletion * core/rawdb: address comments from martin and sina * core/rawdb: fixes cornercase in tail deletion * core/rawdb: separate metadata into a standalone file * core/rawdb: remove unused code * core/rawdb: add random test * core/rawdb: polish code * core/rawdb: fsync meta file before manipulating the index * core/rawdb: fix typo * core/rawdb: address comments
121 lines
3.4 KiB
Go
121 lines
3.4 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rawdb
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import (
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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)
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// copyFrom copies data from 'srcPath' at offset 'offset' into 'destPath'.
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// The 'destPath' is created if it doesn't exist, otherwise it is overwritten.
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// Before the copy is executed, there is a callback can be registered to
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// manipulate the dest file.
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// It is perfectly valid to have destPath == srcPath.
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func copyFrom(srcPath, destPath string, offset uint64, before func(f *os.File) error) error {
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// Create a temp file in the same dir where we want it to wind up
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f, err := ioutil.TempFile(filepath.Dir(destPath), "*")
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if err != nil {
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return err
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}
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fname := f.Name()
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// Clean up the leftover file
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defer func() {
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if f != nil {
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f.Close()
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}
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os.Remove(fname)
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}()
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// Apply the given function if it's not nil before we copy
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// the content from the src.
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if before != nil {
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if err := before(f); err != nil {
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return err
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}
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}
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// Open the source file
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src, err := os.Open(srcPath)
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if err != nil {
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return err
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}
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if _, err = src.Seek(int64(offset), 0); err != nil {
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src.Close()
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return err
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}
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// io.Copy uses 32K buffer internally.
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_, err = io.Copy(f, src)
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if err != nil {
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src.Close()
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return err
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}
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// Rename the temporary file to the specified dest name.
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// src may be same as dest, so needs to be closed before
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// we do the final move.
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src.Close()
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if err := f.Close(); err != nil {
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return err
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}
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f = nil
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if err := os.Rename(fname, destPath); err != nil {
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return err
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}
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return nil
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}
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// openFreezerFileForAppend opens a freezer table file and seeks to the end
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func openFreezerFileForAppend(filename string) (*os.File, error) {
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// Open the file without the O_APPEND flag
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// because it has differing behaviour during Truncate operations
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// on different OS's
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file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0644)
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if err != nil {
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return nil, err
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}
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// Seek to end for append
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if _, err = file.Seek(0, io.SeekEnd); err != nil {
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return nil, err
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}
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return file, nil
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}
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// openFreezerFileForReadOnly opens a freezer table file for read only access
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func openFreezerFileForReadOnly(filename string) (*os.File, error) {
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return os.OpenFile(filename, os.O_RDONLY, 0644)
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}
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// openFreezerFileTruncated opens a freezer table making sure it is truncated
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func openFreezerFileTruncated(filename string) (*os.File, error) {
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return os.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
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}
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// truncateFreezerFile resizes a freezer table file and seeks to the end
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func truncateFreezerFile(file *os.File, size int64) error {
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if err := file.Truncate(size); err != nil {
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return err
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}
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// Seek to end for append
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if _, err := file.Seek(0, io.SeekEnd); err != nil {
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return err
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}
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return nil
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}
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