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// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum 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.
//
// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package api
import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/shared"
"github.com/ethereum/go-ethereum/xeth"
)
const (
Web3ApiVersion = "1.0"
)
var (
// mapping between methods and handlers
Web3Mapping = map[string]web3handler{
"web3_sha3": (*web3Api).Sha3,
"web3_clientVersion": (*web3Api).ClientVersion,
}
)
// web3 callback handler
type web3handler func(*web3Api, *shared.Request) (interface{}, error)
// web3 api provider
type web3Api struct {
xeth *xeth.XEth
methods map[string]web3handler
codec codec.ApiCoder
}
// create a new web3 api instance
func NewWeb3Api(xeth *xeth.XEth, coder codec.Codec) *web3Api {
return &web3Api{
xeth: xeth,
methods: Web3Mapping,
codec: coder.New(nil),
}
}
// collection with supported methods
func (self *web3Api) 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 *web3Api) 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 *web3Api) Name() string {
return shared.Web3ApiName
}
func (self *web3Api) ApiVersion() string {
return Web3ApiVersion
}
// Calculates the sha3 over req.Params.Data
func (self *web3Api) Sha3(req *shared.Request) (interface{}, error) {
args := new(Sha3Args)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
return common.ToHex(crypto.Sha3(common.FromHex(args.Data))), nil
}
// returns the xeth client vrsion
func (self *web3Api) ClientVersion(req *shared.Request) (interface{}, error) {
return self.xeth.ClientVersion(), nil
}
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