59ac229f87
* core/state/snapshot: check dangling storages when generating snapshot * core/state/snapshot: polish * core/state/snapshot: wipe the last part of the dangling storages * core/state/snapshot: fix and add tests * core/state/snapshot: fix comment * README: remove mentions of fast sync (#24656) Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de> * core, cmd: expose dangling storage detector for wider usage * core/state/snapshot: rename variable * core, ethdb: use global iterators for snapshot generation * core/state/snapshot: polish * cmd, core/state/snapshot: polish * core/state/snapshot: polish * Update core/state/snapshot/generate.go Co-authored-by: Martin Holst Swende <martin@swende.se> * ethdb: extend db test suite and fix memorydb iterator * ethdb/dbtest: rollback changes * ethdb/memorydb: simplify iteration * core/state/snapshot: update dangling counter * core/state/snapshot: release iterators * core/state/snapshot: update metrics * core/state/snapshot: update time metrics * metrics/influxdb: temp solution to present counter meaningfully, remove it * add debug log, revert later * core/state/snapshot: fix iterator panic * all: customized snapshot iterator for backward iteration * core, ethdb: polish * core/state/snapshot: remove debug log * core/state/snapshot: address comments from peter * core/state/snapshot: reopen the iterator at the next position * ethdb, core/state/snapshot: address comment from peter * core/state/snapshot: reopen exhausted iterators Co-authored-by: Tbnoapi <63448616+nuoomnoy02@users.noreply.github.com> Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de> Co-authored-by: Martin Holst Swende <martin@swende.se>
98 lines
3.0 KiB
Go
98 lines
3.0 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 snapshot
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/ethdb"
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)
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// holdableIterator is a wrapper of underlying database iterator. It extends
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// the basic iterator interface by adding Hold which can hold the element
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// locally where the iterator is currently located and serve it up next time.
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type holdableIterator struct {
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it ethdb.Iterator
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key []byte
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val []byte
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atHeld bool
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}
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// newHoldableIterator initializes the holdableIterator with the given iterator.
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func newHoldableIterator(it ethdb.Iterator) *holdableIterator {
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return &holdableIterator{it: it}
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}
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// Hold holds the element locally where the iterator is currently located which
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// can be served up next time.
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func (it *holdableIterator) Hold() {
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if it.it.Key() == nil {
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return // nothing to hold
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}
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it.key = common.CopyBytes(it.it.Key())
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it.val = common.CopyBytes(it.it.Value())
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it.atHeld = false
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}
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// Next moves the iterator to the next key/value pair. It returns whether the
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// iterator is exhausted.
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func (it *holdableIterator) Next() bool {
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if !it.atHeld && it.key != nil {
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it.atHeld = true
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} else if it.atHeld {
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it.atHeld = false
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it.key = nil
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it.val = nil
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}
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if it.key != nil {
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return true // shifted to locally held value
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}
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return it.it.Next()
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}
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// Error returns any accumulated error. Exhausting all the key/value pairs
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// is not considered to be an error.
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func (it *holdableIterator) Error() error { return it.it.Error() }
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// Release releases associated resources. Release should always succeed and can
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// be called multiple times without causing error.
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func (it *holdableIterator) Release() {
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it.atHeld = false
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it.key = nil
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it.val = nil
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it.it.Release()
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}
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// Key returns the key of the current key/value pair, or nil if done. The caller
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// should not modify the contents of the returned slice, and its contents may
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// change on the next call to Next.
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func (it *holdableIterator) Key() []byte {
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if it.key != nil {
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return it.key
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}
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return it.it.Key()
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}
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// Value returns the value of the current key/value pair, or nil if done. The
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// caller should not modify the contents of the returned slice, and its contents
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// may change on the next call to Next.
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func (it *holdableIterator) Value() []byte {
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if it.val != nil {
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return it.val
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}
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return it.it.Value()
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}
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