144 lines
4.0 KiB
Go
144 lines
4.0 KiB
Go
// Copyright 2023 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 eth
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import (
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"compress/gzip"
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"errors"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// AdminAPI is the collection of Ethereum full node related APIs for node
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// administration.
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type AdminAPI struct {
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eth *Ethereum
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}
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// NewAdminAPI creates a new instance of AdminAPI.
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func NewAdminAPI(eth *Ethereum) *AdminAPI {
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return &AdminAPI{eth: eth}
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}
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// ExportChain exports the current blockchain into a local file,
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// or a range of blocks if first and last are non-nil.
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func (api *AdminAPI) ExportChain(file string, first *uint64, last *uint64) (bool, error) {
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if first == nil && last != nil {
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return false, errors.New("last cannot be specified without first")
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}
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if first != nil && last == nil {
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head := api.eth.BlockChain().CurrentHeader().Number.Uint64()
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last = &head
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}
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if _, err := os.Stat(file); err == nil {
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// File already exists. Allowing overwrite could be a DoS vector,
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// since the 'file' may point to arbitrary paths on the drive.
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return false, errors.New("location would overwrite an existing file")
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}
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// Make sure we can create the file to export into
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out, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
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if err != nil {
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return false, err
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}
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defer out.Close()
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var writer io.Writer = out
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if strings.HasSuffix(file, ".gz") {
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writer = gzip.NewWriter(writer)
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defer writer.(*gzip.Writer).Close()
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}
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// Export the blockchain
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if first != nil {
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if err := api.eth.BlockChain().ExportN(writer, *first, *last); err != nil {
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return false, err
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}
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} else if err := api.eth.BlockChain().Export(writer); err != nil {
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return false, err
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}
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return true, nil
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}
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func hasAllBlocks(chain *core.BlockChain, bs []*types.Block) bool {
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for _, b := range bs {
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if !chain.HasBlock(b.Hash(), b.NumberU64()) {
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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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// ImportChain imports a blockchain from a local file.
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func (api *AdminAPI) ImportChain(file string) (bool, error) {
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// Make sure the can access the file to import
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in, err := os.Open(file)
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if err != nil {
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return false, err
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}
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defer in.Close()
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var reader io.Reader = in
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if strings.HasSuffix(file, ".gz") {
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if reader, err = gzip.NewReader(reader); err != nil {
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return false, err
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}
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}
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// Run actual the import in pre-configured batches
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stream := rlp.NewStream(reader, 0)
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blocks, index := make([]*types.Block, 0, 2500), 0
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for batch := 0; ; batch++ {
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// Load a batch of blocks from the input file
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for len(blocks) < cap(blocks) {
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block := new(types.Block)
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if err := stream.Decode(block); err == io.EOF {
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break
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} else if err != nil {
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return false, fmt.Errorf("block %d: failed to parse: %v", index, err)
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}
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// ignore the genesis block when importing blocks
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if block.NumberU64() == 0 {
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continue
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}
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blocks = append(blocks, block)
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index++
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}
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if len(blocks) == 0 {
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break
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}
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if hasAllBlocks(api.eth.BlockChain(), blocks) {
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blocks = blocks[:0]
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continue
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}
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// Import the batch and reset the buffer
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if _, err := api.eth.BlockChain().InsertChain(blocks); err != nil {
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return false, fmt.Errorf("batch %d: failed to insert: %v", batch, err)
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}
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blocks = blocks[:0]
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}
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return true, nil
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}
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