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// Copyright 2015 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/>.
package api
import (
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/shared"
"github.com/ethereum/go-ethereum/xeth"
)
const (
DbApiversion = "1.0"
)
var (
// mapping between methods and handlers
DbMapping = map[string]dbhandler{
"db_getString": (*dbApi).GetString,
"db_putString": (*dbApi).PutString,
"db_getHex": (*dbApi).GetHex,
"db_putHex": (*dbApi).PutHex,
}
)
// db callback handler
type dbhandler func(*dbApi, *shared.Request) (interface{}, error)
// db api provider
type dbApi struct {
xeth *xeth.XEth
ethereum *eth.Ethereum
methods map[string]dbhandler
codec codec.ApiCoder
}
// create a new db api instance
func NewDbApi(xeth *xeth.XEth, ethereum *eth.Ethereum, coder codec.Codec) *dbApi {
return &dbApi{
xeth: xeth,
ethereum: ethereum,
methods: DbMapping,
codec: coder.New(nil),
}
}
// collection with supported methods
func (self *dbApi) Methods() []string {
methods := make([]string, len(self.methods))
i := 0
for k := range self.methods {
methods[i] = k
i++
}
return methods
}
// Execute given request
func (self *dbApi) Execute(req *shared.Request) (interface{}, error) {
if callback, ok := self.methods[req.Method]; ok {
return callback(self, req)
}
return nil, &shared.NotImplementedError{req.Method}
}
func (self *dbApi) Name() string {
return shared.DbApiName
}
func (self *dbApi) ApiVersion() string {
return DbApiversion
}
func (self *dbApi) GetString(req *shared.Request) (interface{}, error) {
args := new(DbArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, shared.NewDecodeParamError(err.Error())
}
if err := args.requirements(); err != nil {
return nil, err
}
ret, err := self.xeth.DbGet([]byte(args.Database + args.Key))
return string(ret), err
}
func (self *dbApi) PutString(req *shared.Request) (interface{}, error) {
args := new(DbArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, shared.NewDecodeParamError(err.Error())
}
if err := args.requirements(); err != nil {
return nil, err
}
return self.xeth.DbPut([]byte(args.Database+args.Key), args.Value), nil
}
func (self *dbApi) GetHex(req *shared.Request) (interface{}, error) {
args := new(DbHexArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, shared.NewDecodeParamError(err.Error())
}
if err := args.requirements(); err != nil {
return nil, err
}
if res, err := self.xeth.DbGet([]byte(args.Database + args.Key)); err == nil {
return newHexData(res), nil
} else {
return nil, err
}
}
func (self *dbApi) PutHex(req *shared.Request) (interface{}, error) {
args := new(DbHexArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, shared.NewDecodeParamError(err.Error())
}
if err := args.requirements(); err != nil {
return nil, err
}
return self.xeth.DbPut([]byte(args.Database+args.Key), args.Value), nil
}
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