9e5f03b6c4
With this commit, core/state's access to the underlying key/value database is mediated through an interface. Database errors are tracked in StateDB and returned by CommitTo or the new Error method. Motivation for this change: We can remove the light client's duplicated copy of core/state. The light client now supports node iteration, so tracing and storage enumeration can work with the light client (not implemented in this commit).
165 lines
4.8 KiB
Go
165 lines
4.8 KiB
Go
// Copyright 2016 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 light
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import (
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"bytes"
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"context"
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"errors"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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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/crypto"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/rlp"
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)
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var sha3_nil = crypto.Keccak256Hash(nil)
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var (
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ErrNoTrustedCht = errors.New("No trusted canonical hash trie")
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ErrNoHeader = errors.New("Header not found")
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ChtFrequency = uint64(4096)
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ChtConfirmations = uint64(2048)
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trustedChtKey = []byte("TrustedCHT")
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)
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type ChtNode struct {
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Hash common.Hash
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Td *big.Int
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}
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type TrustedCht struct {
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Number uint64
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Root common.Hash
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}
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func GetTrustedCht(db ethdb.Database) TrustedCht {
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data, _ := db.Get(trustedChtKey)
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var res TrustedCht
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if err := rlp.DecodeBytes(data, &res); err != nil {
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return TrustedCht{0, common.Hash{}}
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}
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return res
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}
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func WriteTrustedCht(db ethdb.Database, cht TrustedCht) {
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data, _ := rlp.EncodeToBytes(cht)
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db.Put(trustedChtKey, data)
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}
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func DeleteTrustedCht(db ethdb.Database) {
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db.Delete(trustedChtKey)
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}
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func GetHeaderByNumber(ctx context.Context, odr OdrBackend, number uint64) (*types.Header, error) {
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db := odr.Database()
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hash := core.GetCanonicalHash(db, number)
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if (hash != common.Hash{}) {
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// if there is a canonical hash, there is a header too
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header := core.GetHeader(db, hash, number)
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if header == nil {
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panic("Canonical hash present but header not found")
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}
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return header, nil
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}
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cht := GetTrustedCht(db)
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if number >= cht.Number*ChtFrequency {
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return nil, ErrNoTrustedCht
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}
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r := &ChtRequest{ChtRoot: cht.Root, ChtNum: cht.Number, BlockNum: number}
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if err := odr.Retrieve(ctx, r); err != nil {
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return nil, err
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} else {
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return r.Header, nil
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}
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}
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func GetCanonicalHash(ctx context.Context, odr OdrBackend, number uint64) (common.Hash, error) {
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hash := core.GetCanonicalHash(odr.Database(), number)
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if (hash != common.Hash{}) {
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return hash, nil
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}
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header, err := GetHeaderByNumber(ctx, odr, number)
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if header != nil {
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return header.Hash(), nil
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}
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return common.Hash{}, err
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}
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// GetBodyRLP retrieves the block body (transactions and uncles) in RLP encoding.
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func GetBodyRLP(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (rlp.RawValue, error) {
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if data := core.GetBodyRLP(odr.Database(), hash, number); data != nil {
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return data, nil
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}
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r := &BlockRequest{Hash: hash, Number: number}
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if err := odr.Retrieve(ctx, r); err != nil {
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return nil, err
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} else {
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return r.Rlp, nil
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}
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}
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// GetBody retrieves the block body (transactons, uncles) corresponding to the
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// hash.
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func GetBody(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (*types.Body, error) {
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data, err := GetBodyRLP(ctx, odr, hash, number)
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if err != nil {
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return nil, err
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}
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body := new(types.Body)
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if err := rlp.Decode(bytes.NewReader(data), body); err != nil {
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return nil, err
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}
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return body, nil
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}
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// GetBlock retrieves an entire block corresponding to the hash, assembling it
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// back from the stored header and body.
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func GetBlock(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (*types.Block, error) {
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// Retrieve the block header and body contents
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header := core.GetHeader(odr.Database(), hash, number)
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if header == nil {
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return nil, ErrNoHeader
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}
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body, err := GetBody(ctx, odr, hash, number)
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if err != nil {
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return nil, err
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}
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// Reassemble the block and return
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return types.NewBlockWithHeader(header).WithBody(body.Transactions, body.Uncles), nil
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}
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// GetBlockReceipts retrieves the receipts generated by the transactions included
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// in a block given by its hash.
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func GetBlockReceipts(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (types.Receipts, error) {
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receipts := core.GetBlockReceipts(odr.Database(), hash, number)
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if receipts != nil {
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return receipts, nil
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}
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r := &ReceiptsRequest{Hash: hash, Number: number}
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if err := odr.Retrieve(ctx, r); err != nil {
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return nil, err
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}
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return r.Receipts, nil
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}
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