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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// 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.
//
// 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 (
"math/big"
"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 (
ShhApiVersion = "1.0"
)
var (
// mapping between methods and handlers
shhMapping = map[string]shhhandler{
"shh_version": (*shhApi).Version,
"shh_post": (*shhApi).Post,
"shh_hasIdentity": (*shhApi).HasIdentity,
"shh_newIdentity": (*shhApi).NewIdentity,
"shh_newFilter": (*shhApi).NewFilter,
"shh_uninstallFilter": (*shhApi).UninstallFilter,
"shh_getFilterChanges": (*shhApi).GetFilterChanges,
}
)
func newWhisperOfflineError(method string) error {
return shared.NewNotAvailableError(method, "whisper offline")
}
// net callback handler
type shhhandler func(*shhApi, *shared.Request) (interface{}, error)
// shh api provider
type shhApi struct {
xeth *xeth.XEth
ethereum *eth.Ethereum
methods map[string]shhhandler
codec codec.ApiCoder
}
// create a new whisper api instance
func NewShhApi(xeth *xeth.XEth, eth *eth.Ethereum, coder codec.Codec) *shhApi {
return &shhApi{
xeth: xeth,
ethereum: eth,
methods: shhMapping,
codec: coder.New(nil),
}
}
// collection with supported methods
func (self *shhApi) 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 *shhApi) Execute(req *shared.Request) (interface{}, error) {
if callback, ok := self.methods[req.Method]; ok {
return callback(self, req)
}
return nil, shared.NewNotImplementedError(req.Method)
}
func (self *shhApi) Name() string {
return shared.ShhApiName
}
func (self *shhApi) ApiVersion() string {
return ShhApiVersion
}
func (self *shhApi) Version(req *shared.Request) (interface{}, error) {
w := self.xeth.Whisper()
if w == nil {
return nil, newWhisperOfflineError(req.Method)
}
return w.Version(), nil
}
func (self *shhApi) Post(req *shared.Request) (interface{}, error) {
w := self.xeth.Whisper()
if w == nil {
return nil, newWhisperOfflineError(req.Method)
}
args := new(WhisperMessageArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
err := w.Post(args.Payload, args.To, args.From, args.Topics, args.Priority, args.Ttl)
if err != nil {
return false, err
}
return true, nil
}
func (self *shhApi) HasIdentity(req *shared.Request) (interface{}, error) {
w := self.xeth.Whisper()
if w == nil {
return nil, newWhisperOfflineError(req.Method)
}
args := new(WhisperIdentityArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
return w.HasIdentity(args.Identity), nil
}
func (self *shhApi) NewIdentity(req *shared.Request) (interface{}, error) {
w := self.xeth.Whisper()
if w == nil {
return nil, newWhisperOfflineError(req.Method)
}
return w.NewIdentity(), nil
}
func (self *shhApi) NewFilter(req *shared.Request) (interface{}, error) {
args := new(WhisperFilterArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
id := self.xeth.NewWhisperFilter(args.To, args.From, args.Topics)
return newHexNum(big.NewInt(int64(id)).Bytes()), nil
}
func (self *shhApi) UninstallFilter(req *shared.Request) (interface{}, error) {
args := new(FilterIdArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
return self.xeth.UninstallWhisperFilter(args.Id), nil
}
func (self *shhApi) GetFilterChanges(req *shared.Request) (interface{}, error) {
w := self.xeth.Whisper()
if w == nil {
return nil, newWhisperOfflineError(req.Method)
}
// Retrieve all the new messages arrived since the last request
args := new(FilterIdArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
return self.xeth.WhisperMessagesChanged(args.Id), nil
}
func (self *shhApi) GetMessages(req *shared.Request) (interface{}, error) {
w := self.xeth.Whisper()
if w == nil {
return nil, newWhisperOfflineError(req.Method)
}
// Retrieve all the cached messages matching a specific, existing filter
args := new(FilterIdArgs)
if err := self.codec.Decode(req.Params, &args); err != nil {
return nil, err
}
return self.xeth.WhisperMessages(args.Id), nil
}
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