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108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
// Copyright (C) 2019-2025, Lux Industries, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package customrawdb
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import (
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"fmt"
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"github.com/luxfi/geth/common"
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"github.com/luxfi/geth/core/rawdb"
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"github.com/luxfi/geth/ethdb"
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)
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func ExampleInspectDatabase() {
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db := &stubDatabase{
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iterator: &stubIterator{},
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}
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// Extra metadata keys: (17 + 32) + (12 + 32) = 93 bytes
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WriteSnapshotBlockHash(db, common.Hash{})
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rawdb.WriteSnapshotRoot(db, common.Hash{})
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// Trie segments: (77 + 2) + 1 = 80 bytes
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_ = WriteSyncSegment(db, common.Hash{}, common.Hash{})
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// Storage tries to fetch: 76 + 1 = 77 bytes
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_ = WriteSyncStorageTrie(db, common.Hash{}, common.Hash{})
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// Code to fetch: 34 + 0 = 34 bytes
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AddCodeToFetch(db, common.Hash{})
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// Block numbers synced to: 22 + 1 = 23 bytes
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_ = WriteSyncPerformed(db, 0)
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keyPrefix := []byte(nil)
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keyStart := []byte(nil)
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err := InspectDatabase(db, keyPrefix, keyStart)
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if err != nil {
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fmt.Println(err)
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}
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// NOTE: InspectDatabase is currently stubbed out (returns nil).
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// When implemented, this example will produce a database statistics table.
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}
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type stubDatabase struct {
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ethdb.Database
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iterator *stubIterator
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}
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func (s *stubDatabase) NewIterator(keyPrefix, keyStart []byte) ethdb.Iterator {
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return s.iterator
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}
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// AncientSize is used in [InspectDatabase] to determine the ancient sizes.
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func (s *stubDatabase) AncientSize(kind string) (uint64, error) {
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return 0, nil
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}
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func (s *stubDatabase) Ancients() (uint64, error) {
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return 0, nil
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}
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func (s *stubDatabase) Tail() (uint64, error) {
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return 0, nil
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}
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func (s *stubDatabase) Put(key, value []byte) error {
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s.iterator.kvs = append(s.iterator.kvs, keyValue{key: key, value: value})
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return nil
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}
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func (s *stubDatabase) Get(key []byte) ([]byte, error) {
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return nil, nil
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}
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func (s *stubDatabase) ReadAncients(fn func(ethdb.AncientReaderOp) error) error {
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return nil
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}
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type stubIterator struct {
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ethdb.Iterator
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i int // see [stubIterator.pos]
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kvs []keyValue
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}
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type keyValue struct {
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key []byte
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value []byte
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}
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// pos returns the true iterator position, which is otherwise off by one because
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// Next() is called _before_ usage.
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func (s *stubIterator) pos() int {
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return s.i - 1
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}
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func (s *stubIterator) Next() bool {
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s.i++
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return s.pos() < len(s.kvs)
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}
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func (s *stubIterator) Release() {}
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func (s *stubIterator) Key() []byte {
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return s.kvs[s.pos()].key
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}
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func (s *stubIterator) Value() []byte {
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return s.kvs[s.pos()].value
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}
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