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remotedb.go
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remotedb.go
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// Copyright 2022 The go-jjang Authors
// This file is part of the go-jjang library.
//
// The go-jjang 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-jjang 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-jjang library. If not, see <http://www.gnu.org/licenses/>.
// Package remotedb implements the key-value database layer based on a remote gjang
// node. Under the hood, it utilises the `debug_dbGet` method to implement a
// read-only database.
// There really are no guarantees in this database, since the local gjang does not
// exclusive access, but it can be used for basic diagnostics of a remote node.
package remotedb
import (
"errors"
"strings"
"github.com/jjang-network/go-jjang/common/hexutil"
"github.com/jjang-network/go-jjang/ethdb"
"github.com/jjang-network/go-jjang/rpc"
)
// Database is a key-value lookup for a remote database via debug_dbGet.
type Database struct {
remote *rpc.Client
}
func (db *Database) Has(key []byte) (bool, error) {
if _, err := db.Get(key); err != nil {
return false, nil
}
return true, nil
}
func (db *Database) Get(key []byte) ([]byte, error) {
var resp hexutil.Bytes
err := db.remote.Call(&resp, "debug_dbGet", hexutil.Bytes(key))
if err != nil {
return nil, err
}
return resp, nil
}
func (db *Database) HasAncient(kind string, number uint64) (bool, error) {
if _, err := db.Ancient(kind, number); err != nil {
return false, nil
}
return true, nil
}
func (db *Database) Ancient(kind string, number uint64) ([]byte, error) {
var resp hexutil.Bytes
err := db.remote.Call(&resp, "debug_dbAncient", kind, number)
if err != nil {
return nil, err
}
return resp, nil
}
func (db *Database) AncientRange(kind string, start, count, maxBytes uint64) ([][]byte, error) {
panic("not supported")
}
func (db *Database) Ancients() (uint64, error) {
var resp uint64
err := db.remote.Call(&resp, "debug_dbAncients")
return resp, err
}
func (db *Database) Tail() (uint64, error) {
panic("not supported")
}
func (db *Database) AncientSize(kind string) (uint64, error) {
panic("not supported")
}
func (db *Database) ReadAncients(fn func(op ethdb.AncientReaderOp) error) (err error) {
return fn(db)
}
func (db *Database) Put(key []byte, value []byte) error {
panic("not supported")
}
func (db *Database) Delete(key []byte) error {
panic("not supported")
}
func (db *Database) ModifyAncients(f func(ethdb.AncientWriteOp) error) (int64, error) {
panic("not supported")
}
func (db *Database) TruncateHead(n uint64) error {
panic("not supported")
}
func (db *Database) TruncateTail(n uint64) error {
panic("not supported")
}
func (db *Database) Sync() error {
return nil
}
func (db *Database) MigrateTable(s string, f func([]byte) ([]byte, error)) error {
panic("not supported")
}
func (db *Database) NewBatch() ethdb.Batch {
panic("not supported")
}
func (db *Database) NewBatchWithSize(size int) ethdb.Batch {
panic("not supported")
}
func (db *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator {
panic("not supported")
}
func (db *Database) Stat(property string) (string, error) {
panic("not supported")
}
func (db *Database) AncientDatadir() (string, error) {
panic("not supported")
}
func (db *Database) Compact(start []byte, limit []byte) error {
return nil
}
func (db *Database) NewSnapshot() (ethdb.Snapshot, error) {
panic("not supported")
}
func (db *Database) Close() error {
db.remote.Close()
return nil
}
func dialRPC(endpoint string) (*rpc.Client, error) {
if endpoint == "" {
return nil, errors.New("endpoint must be specified")
}
if strings.HasPrefix(endpoint, "rpc:") || strings.HasPrefix(endpoint, "ipc:") {
// Backwards compatibility with gjang < 1.5 which required
// these prefixes.
endpoint = endpoint[4:]
}
return rpc.Dial(endpoint)
}
func New(endpoint string) (ethdb.Database, error) {
client, err := dialRPC(endpoint)
if err != nil {
return nil, err
}
return &Database{
remote: client,
}, nil
}