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https://github.com/ethereum/go-ethereum.git
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87 lines
2.8 KiB
Go
87 lines
2.8 KiB
Go
// Copyright 2025 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 pathdb
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import (
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"errors"
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"fmt"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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)
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var (
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errHeadTruncationOutOfRange = errors.New("history head truncation out of range")
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errTailTruncationOutOfRange = errors.New("history tail truncation out of range")
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)
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// truncateFromHead removes excess elements from the head of the freezer based
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// on the given parameters. It returns the number of items that were removed.
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func truncateFromHead(store ethdb.AncientStore, nhead uint64) (int, error) {
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ohead, err := store.Ancients()
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if err != nil {
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return 0, err
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}
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otail, err := store.Tail()
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if err != nil {
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return 0, err
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}
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log.Info("Truncating from head", "ohead", ohead, "tail", otail, "nhead", nhead)
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// Ensure that the truncation target falls within the valid range.
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if ohead < nhead || nhead < otail {
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return 0, fmt.Errorf("%w, tail: %d, head: %d, target: %d", errHeadTruncationOutOfRange, otail, ohead, nhead)
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}
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// Short circuit if nothing to truncate.
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if ohead == nhead {
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return 0, nil
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}
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ohead, err = store.TruncateHead(nhead)
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if err != nil {
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return 0, err
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}
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// Associated root->id mappings are left in the database and wait
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// for overwriting.
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return int(ohead - nhead), nil
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}
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// truncateFromTail removes excess elements from the end of the freezer based
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// on the given parameters. It returns the number of items that were removed.
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func truncateFromTail(store ethdb.AncientStore, ntail uint64) (int, error) {
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ohead, err := store.Ancients()
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if err != nil {
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return 0, err
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}
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otail, err := store.Tail()
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if err != nil {
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return 0, err
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}
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// Ensure that the truncation target falls within the valid range.
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if otail > ntail || ntail > ohead {
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return 0, fmt.Errorf("%w, tail: %d, head: %d, target: %d", errTailTruncationOutOfRange, otail, ohead, ntail)
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}
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// Short circuit if nothing to truncate.
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if otail == ntail {
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return 0, nil
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}
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otail, err = store.TruncateTail(ntail)
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if err != nil {
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return 0, err
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}
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// Associated root->id mappings are left in the database.
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return int(ntail - otail), nil
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}
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