path: root/core/rawdb/accessors_chain.go

// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package rawdb

import (
    "bytes"
    "encoding/binary"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/rlp"
)

// ReadCanonicalHash retrieves the hash assigned to a canonical block number.
func ReadCanonicalHash(db DatabaseReader, number uint64) common.Hash {
    data, _ := db.Get(headerHashKey(number))
    if len(data) == 0 {
        return common.Hash{}
    }
    return common.BytesToHash(data)
}

// WriteCanonicalHash stores the hash assigned to a canonical block number.
func WriteCanonicalHash(db DatabaseWriter, hash common.Hash, number uint64) {
    if err := db.Put(headerHashKey(number), hash.Bytes()); err != nil {
        log.Crit("Failed to store number to hash mapping", "err", err)
    }
}

// DeleteCanonicalHash removes the number to hash canonical mapping.
func DeleteCanonicalHash(db DatabaseDeleter, number uint64) {
    if err := db.Delete(headerHashKey(number)); err != nil {
        log.Crit("Failed to delete number to hash mapping", "err", err)
    }
}

// ReadHeaderNumber returns the header number assigned to a hash.
func ReadHeaderNumber(db DatabaseReader, hash common.Hash) *uint64 {
    data, _ := db.Get(headerNumberKey(hash))
    if len(data) != 8 {
        return nil
    }
    number := binary.BigEndian.Uint64(data)
    return &number
}

// ReadHeadHeaderHash retrieves the hash of the current canonical head header.
func ReadHeadHeaderHash(db DatabaseReader) common.Hash {
    data, _ := db.Get(headHeaderKey)
    if len(data) == 0 {
        return common.Hash{}
    }
    return common.BytesToHash(data)
}

// WriteHeadHeaderHash stores the hash of the current canonical head header.
func WriteHeadHeaderHash(db DatabaseWriter, hash common.Hash) {
    if err := db.Put(headHeaderKey, hash.Bytes()); err != nil {
        log.Crit("Failed to store last header's hash", "err", err)
    }
}

// ReadHeadBlockHash retrieves the hash of the current canonical head block.
func ReadHeadBlockHash(db DatabaseReader) common.Hash {
    data, _ := db.Get(headBlockKey)
    if len(data) == 0 {
        return common.Hash{}
    }
    return common.BytesToHash(data)
}

// WriteHeadBlockHash stores the head block's hash.
func WriteHeadBlockHash(db DatabaseWriter, hash common.Hash) {
    if err := db.Put(headBlockKey, hash.Bytes()); err != nil {
        log.Crit("Failed to store last block's hash", "err", err)
    }
}

// ReadHeadFastBlockHash retrieves the hash of the current fast-sync head block.
func ReadHeadFastBlockHash(db DatabaseReader) common.Hash {
    data, _ := db.Get(headFastBlockKey)
    if len(data) == 0 {
        return common.Hash{}
    }
    return common.BytesToHash(data)
}

// WriteHeadFastBlockHash stores the hash of the current fast-sync head block.
func WriteHeadFastBlockHash(db DatabaseWriter, hash common.Hash) {
    if err := db.Put(headFastBlockKey, hash.Bytes()); err != nil {
        log.Crit("Failed to store last fast block's hash", "err", err)
    }
}

// ReadFastTrieProgress retrieves the number of tries nodes fast synced to allow
// reporting correct numbers across restarts.
func ReadFastTrieProgress(db DatabaseReader) uint64 {
    data, _ := db.Get(fastTrieProgressKey)
    if len(data) == 0 {
        return 0
    }
    return new(big.Int).SetBytes(data).Uint64()
}

// WriteFastTrieProgress stores the fast sync trie process counter to support
// retrieving it across restarts.
func WriteFastTrieProgress(db DatabaseWriter, count uint64) {
    if err := db.Put(fastTrieProgressKey, new(big.Int).SetUint64(count).Bytes()); err != nil {
        log.Crit("Failed to store fast sync trie progress", "err", err)
    }
}

// ReadHeaderRLP retrieves a block header in its raw RLP database encoding.
func ReadHeaderRLP(db DatabaseReader, hash common.Hash, number uint64) rlp.RawValue {
    data, _ := db.Get(headerKey(number, hash))
    return data
}

// HasHeader verifies the existence of a block header corresponding to the hash.
func HasHeader(db DatabaseReader, hash common.Hash, number uint64) bool {
    if has, err := db.Has(headerKey(number, hash)); !has || err != nil {
        return false
    }
    return true
}

// ReadHeader retrieves the block header corresponding to the hash.
func ReadHeader(db DatabaseReader, hash common.Hash, number uint64) *types.Header {
    data := ReadHeaderRLP(db, hash, number)
    if len(data) == 0 {
        return nil
    }
    header := new(types.Header)
    if err := rlp.Decode(bytes.NewReader(data), header); err != nil {
        log.Error("Invalid block header RLP", "hash", hash, "err", err)
        return nil
    }
    return header
}

// WriteHeader stores a block header into the database and also stores the hash-
// to-number mapping.
func WriteHeader(db DatabaseWriter, header *types.Header) {
    // Write the hash -> number mapping
    var (
        hash    = header.Hash()
        number  = header.Number.Uint64()
        encoded = encodeBlockNumber(number)
    )
    key := headerNumberKey(hash)
    if err := db.Put(key, encoded); err != nil {
        log.Crit("Failed to store hash to number mapping", "err", err)
    }
    // Write the encoded header
    data, err := rlp.EncodeToBytes(header)
    if err != nil {
        log.Crit("Failed to RLP encode header", "err", err)
    }
    key = headerKey(number, hash)
    if err := db.Put(key, data); err != nil {
        log.Crit("Failed to store header", "err", err)
    }
}

// DeleteHeader removes all block header data associated with a hash.
func DeleteHeader(db DatabaseDeleter, hash common.Hash, number uint64) {
    if err := db.Delete(headerKey(number, hash)); err != nil {
        log.Crit("Failed to delete header", "err", err)
    }
    if err := db.Delete(headerNumberKey(hash)); err != nil {
        log.Crit("Failed to delete hash to number mapping", "err", err)
    }
}

// ReadBodyRLP retrieves the block body (transactions and uncles) in RLP encoding.
func ReadBodyRLP(db DatabaseReader, hash common.Hash, number uint64) rlp.RawValue {
    data, _ := db.Get(blockBodyKey(number, hash))
    return data
}

// WriteBodyRLP stores an RLP encoded block body into the database.
func WriteBodyRLP(db DatabaseWriter, hash common.Hash, number uint64, rlp rlp.RawValue) {
    if err := db.Put(blockBodyKey(number, hash), rlp); err != nil {
        log.Crit("Failed to store block body", "err", err)
    }
}

// HasBody verifies the existence of a block body corresponding to the hash.
func HasBody(db DatabaseReader, hash common.Hash, number uint64) bool {
    if has, err := db.Has(blockBodyKey(number, hash)); !has || err != nil {
        return false
    }
    return true
}

// ReadBody retrieves the block body corresponding to the hash.
func ReadBody(db DatabaseReader, hash common.Hash, number uint64) *types.Body {
    data := ReadBodyRLP(db, hash, number)
    if len(data) == 0 {
        return nil
    }
    body := new(types.Body)
    if err := rlp.Decode(bytes.NewReader(data), body); err != nil {
        log.Error("Invalid block body RLP", "hash", hash, "err", err)
        return nil
    }
    return body
}

// WriteBody storea a block body into the database.
func WriteBody(db DatabaseWriter, hash common.Hash, number uint64, body *types.Body) {
    data, err := rlp.EncodeToBytes(body)
    if err != nil {
        log.Crit("Failed to RLP encode body", "err", err)
    }
    WriteBodyRLP(db, hash, number, data)
}

// DeleteBody removes all block body data associated with a hash.
func DeleteBody(db DatabaseDeleter, hash common.Hash, number uint64) {
    if err := db.Delete(blockBodyKey(number, hash)); err != nil {
        log.Crit("Failed to delete block body", "err", err)
    }
}

// ReadTd retrieves a block's total difficulty corresponding to the hash.
func ReadTd(db DatabaseReader, hash common.Hash, number uint64) *big.Int {
    data, _ := db.Get(headerTDKey(number, hash))
    if len(data) == 0 {
        return nil
    }
    td := new(big.Int)
    if err := rlp.Decode(bytes.NewReader(data), td); err != nil {
        log.Error("Invalid block total difficulty RLP", "hash", hash, "err", err)
        return nil
    }
    return td
}

// WriteTd stores the total difficulty of a block into the database.
func WriteTd(db DatabaseWriter, hash common.Hash, number uint64, td *big.Int) {
    data, err := rlp.EncodeToBytes(td)
    if err != nil {
        log.Crit("Failed to RLP encode block total difficulty", "err", err)
    }
    if err := db.Put(headerTDKey(number, hash), data); err != nil {
        log.Crit("Failed to store block total difficulty", "err", err)
    }
}

// DeleteTd removes all block total difficulty data associated with a hash.
func DeleteTd(db DatabaseDeleter, hash common.Hash, number uint64) {
    if err := db.Delete(headerTDKey(number, hash)); err != nil {
        log.Crit("Failed to delete block total difficulty", "err", err)
    }
}

// HasReceipts verifies the existence of all the transaction receipts belonging
// to a block.
func HasReceipts(db DatabaseReader, hash common.Hash, number uint64) bool {
    if has, err := db.Has(blockReceiptsKey(number, hash)); !has || err != nil {
        return false
    }
    return true
}

// ReadReceipts retrieves all the transaction receipts belonging to a block.
func ReadReceipts(db DatabaseReader, hash common.Hash, number uint64) types.Receipts {
    // Retrieve the flattened receipt slice
    data, _ := db.Get(blockReceiptsKey(number, hash))
    if len(data) == 0 {
        return nil
    }
    // Convert the receipts from their storage form to their internal representation
    storageReceipts := []*types.ReceiptForStorage{}
    if err := rlp.DecodeBytes(data, &storageReceipts); err != nil {
        log.Error("Invalid receipt array RLP", "hash", hash, "err", err)
        return nil
    }
    receipts := make(types.Receipts, len(storageReceipts))
    for i, receipt := range storageReceipts {
        receipts[i] = (*types.Receipt)(receipt)
    }
    return receipts
}

// WriteReceipts stores all the transaction receipts belonging to a block.
func WriteReceipts(db DatabaseWriter, hash common.Hash, number uint64, receipts types.Receipts) {
    // Convert the receipts into their storage form and serialize them
    storageReceipts := make([]*types.ReceiptForStorage, len(receipts))
    for i, receipt := range receipts {
        storageReceipts[i] = (*types.ReceiptForStorage)(receipt)
    }
    bytes, err := rlp.EncodeToBytes(storageReceipts)
    if err != nil {
        log.Crit("Failed to encode block receipts", "err", err)
    }
    // Store the flattened receipt slice
    if err := db.Put(blockReceiptsKey(number, hash), bytes); err != nil {
        log.Crit("Failed to store block receipts", "err", err)
    }
}

// DeleteReceipts removes all receipt data associated with a block hash.
func DeleteReceipts(db DatabaseDeleter, hash common.Hash, number uint64) {
    if err := db.Delete(blockReceiptsKey(number, hash)); err != nil {
        log.Crit("Failed to delete block receipts", "err", err)
    }
}

// ReadBlock retrieves an entire block corresponding to the hash, assembling it
// back from the stored header and body. If either the header or body could not
// be retrieved nil is returned.
//
// Note, due to concurrent download of header and block body the header and thus
// canonical hash can be stored in the database but the body data not (yet).
func ReadBlock(db DatabaseReader, hash common.Hash, number uint64) *types.Block {
    header := ReadHeader(db, hash, number)
    if header == nil {
        return nil
    }
    body := ReadBody(db, hash, number)
    if body == nil {
        return nil
    }
    return types.NewBlockWithHeader(header).WithBody(body.Transactions, body.Uncles)
}

// WriteBlock serializes a block into the database, header and body separately.
func WriteBlock(db DatabaseWriter, block *types.Block) {
    WriteBody(db, block.Hash(), block.NumberU64(), block.Body())
    WriteHeader(db, block.Header())
}

// DeleteBlock removes all block data associated with a hash.
func DeleteBlock(db DatabaseDeleter, hash common.Hash, number uint64) {
    DeleteReceipts(db, hash, number)
    DeleteHeader(db, hash, number)
    DeleteBody(db, hash, number)
    DeleteTd(db, hash, number)
}

// FindCommonAncestor returns the last common ancestor of two block headers
func FindCommonAncestor(db DatabaseReader, a, b *types.Header) *types.Header {
    for bn := b.Number.Uint64(); a.Number.Uint64() > bn; {
        a = ReadHeader(db, a.ParentHash, a.Number.Uint64()-1)
        if a == nil {
            return nil
        }
    }
    for an := a.Number.Uint64(); an < b.Number.Uint64(); {
        b = ReadHeader(db, b.ParentHash, b.Number.Uint64()-1)
        if b == nil {
            return nil
        }
    }
    for a.Hash() != b.Hash() {
        a = ReadHeader(db, a.ParentHash, a.Number.Uint64()-1)
        if a == nil {
            return nil
        }
        b = ReadHeader(db, b.ParentHash, b.Number.Uint64()-1)
        if b == nil {
            return nil
        }
    }
    return a
}