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| // Copyright 2021 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/>. | ||
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| //go:build js | ||
| // +build js | ||
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| // Package leveldb implements the key-value database layer based on LevelDB. | ||
| package leveldb | ||
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| import ( | ||
| "errors" | ||
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| "github.com/ethereum/go-ethereum/ethdb" | ||
| ) | ||
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| type Database struct { | ||
| unconstructable struct{} | ||
| } | ||
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| // New returns a wrapped LevelDB object. The namespace is the prefix that the | ||
| // metrics reporting should use for surfacing internal stats. | ||
| func New(file string, cache int, handles int, namespace string, readonly bool) (*Database, error) { | ||
| return nil, errors.New("leveldb is unavailable on JS platforms") | ||
| } | ||
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| /* | ||
| // NewCustom returns a wrapped LevelDB object. The namespace is the prefix that the | ||
| // metrics reporting should use for surfacing internal stats. | ||
| // The customize function allows the caller to modify the leveldb options. | ||
| func NewCustom(file string, namespace string, customize func(options *opt.Options)) (*Database, error) { | ||
| return nil, errors.New("leveldb is unavailable on JS platforms") | ||
| } | ||
| // configureOptions sets some default options, then runs the provided setter. | ||
| func configureOptions(customizeFn func(*opt.Options)) *opt.Options { | ||
| // Set default options | ||
| options := &opt.Options{ | ||
| Filter: filter.NewBloomFilter(10), | ||
| DisableSeeksCompaction: true, | ||
| } | ||
| // Allow caller to make custom modifications to the options | ||
| if customizeFn != nil { | ||
| customizeFn(options) | ||
| } | ||
| return options | ||
| } | ||
| */ | ||
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| // Close stops the metrics collection, flushes any pending data to disk and closes | ||
| // all io accesses to the underlying key-value store. | ||
| func (db *Database) Close() error { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Has retrieves if a key is present in the key-value store. | ||
| func (db *Database) Has(key []byte) (bool, error) { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Get retrieves the given key if it's present in the key-value store. | ||
| func (db *Database) Get(key []byte) ([]byte, error) { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Put inserts the given value into the key-value store. | ||
| func (db *Database) Put(key []byte, value []byte) error { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Delete removes the key from the key-value store. | ||
| func (db *Database) Delete(key []byte) error { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // NewBatch creates a write-only key-value store that buffers changes to its host | ||
| // database until a final write is called. | ||
| func (db *Database) NewBatch() ethdb.Batch { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // NewIterator creates a binary-alphabetical iterator over a subset | ||
| // of database content with a particular key prefix, starting at a particular | ||
| // initial key (or after, if it does not exist). | ||
| func (db *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Stat returns a particular internal stat of the database. | ||
| func (db *Database) Stat(property string) (string, error) { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Compact flattens the underlying data store for the given key range. In essence, | ||
| // deleted and overwritten versions are discarded, and the data is rearranged to | ||
| // reduce the cost of operations needed to access them. | ||
| // | ||
| // A nil start is treated as a key before all keys in the data store; a nil limit | ||
| // is treated as a key after all keys in the data store. If both is nil then it | ||
| // will compact entire data store. | ||
| func (db *Database) Compact(start []byte, limit []byte) error { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } | ||
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| // Path returns the path to the database directory. | ||
| func (db *Database) Path() string { | ||
| panic("Method called on unconstructable leveldb database") | ||
| } |