/*
For each request type, define the following:
1. RpcRequest "To" method [message.go], which does basic validation and conversion to "Args" type via json.Decoder()
2. json.Decoder() calls "UnmarshalON" defined on each "Args" struct
3. EthereumApi method, taking the "Args" type and replying with an interface to be marshalled to ON
*/
package rpc
import (
"fmt"
"math/big"
"strings"
"sync"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/event/filter"
"github.com/ethereum/go-ethereum/state"
"github.com/ethereum/go-ethereum/xeth"
)
const (
defaultGasPrice = "10000000000000"
defaultGas = "10000"
)
type EthereumApi struct {
xeth *xeth.XEth
filterManager *filter.FilterManager
logMut sync.RWMutex
logs map[int]state.Logs
messagesMut sync.RWMutex
messages map[int][]xeth.WhisperMessage
// Register keeps a list of accounts and transaction data
regmut sync.Mutex
register map[string][]*NewTxArgs
db ethutil.Database
}
func NewEthereumApi(eth *xeth.XEth) *EthereumApi {
db, _ := ethdb.NewLDBDatabase("dapps")
api := &EthereumApi{
xeth: eth,
filterManager: filter.NewFilterManager(eth.Backend().EventMux()),
logs: make(map[int]state.Logs),
messages: make(map[int][]xeth.WhisperMessage),
db: db,
}
go api.filterManager.Start()
return api
}
func (self *EthereumApi) Register(args string, reply *interface{}) error {
self.regmut.Lock()
defer self.regmut.Unlock()
if _, ok := self.register[args]; ok {
self.register[args] = nil // register with empty
}
return nil
}
func (self *EthereumApi) Unregister(args string, reply *interface{}) error {
self.regmut.Lock()
defer self.regmut.Unlock()
delete(self.register, args)
return nil
}
func (self *EthereumApi) WatchTx(args string, reply *interface{}) error {
self.regmut.Lock()
defer self.regmut.Unlock()
txs := self.register[args]
self.register[args] = nil
*reply = txs
return nil
}
func (self *EthereumApi) NewFilter(args *FilterOptions, reply *interface{}) error {
var id int
filter := core.NewFilter(self.xeth.Backend())
filter.SetOptions(toFilterOptions(args))
filter.LogsCallback = func(logs state.Logs) {
self.logMut.Lock()
defer self.logMut.Unlock()
self.logs[id] = append(self.logs[id], logs...)
}
id = self.filterManager.InstallFilter(filter)
*reply = id
return nil
}
func (self *EthereumApi) NewFilterString(args string, reply *interface{}) error {
var id int
filter := core.NewFilter(self.xeth.Backend())
callback := func(block *types.Block) {
self.logMut.Lock()
defer self.logMut.Unlock()
self.logs[id] = append(self.logs[id], &state.StateLog{})
}
if args == "pending" {
filter.PendingCallback = callback
} else if args == "chain" {
filter.BlockCallback = callback
}
id = self.filterManager.InstallFilter(filter)
*reply = id
return nil
}
func (self *EthereumApi) FilterChanged(id int, reply *interface{}) error {
self.logMut.Lock()
defer self.logMut.Unlock()
*reply = toLogs(self.logs[id])
self.logs[id] = nil // empty the logs
return nil
}
func (self *EthereumApi) Logs(id int, reply *interface{}) error {
self.logMut.Lock()
defer self.logMut.Unlock()
filter := self.filterManager.GetFilter(id)
if filter != nil {
*reply = toLogs(filter.Find())
}
return nil
}
func (p *EthereumApi) GetBlock(args *GetBlockArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
if args.BlockNumber > 0 {
*reply = p.xeth.BlockByNumber(args.BlockNumber)
} else {
*reply = p.xeth.BlockByHash(args.Hash)
}
return nil
}
func (p *EthereumApi) Transact(args *NewTxArgs, reply *interface{}) error {
if len(args.Gas) == 0 {
args.Gas = defaultGas
}
if len(args.GasPrice) == 0 {
args.GasPrice = defaultGasPrice
}
// TODO if no_private_key then
if _, exists := p.register[args.From]; exists {
p.register[args.From] = append(p.register[args.From], args)
} else {
result, _ := p.xeth.Transact( /* TODO specify account */ args.To, args.Value, args.Gas, args.GasPrice, args.Data)
*reply = result
}
return nil
}
func (p *EthereumApi) Call(args *NewTxArgs, reply *interface{}) error {
result, err := p.xeth.Call( /* TODO specify account */ args.To, args.Value, args.Gas, args.GasPrice, args.Data)
if err != nil {
return err
}
*reply = result
return nil
}
func (p *EthereumApi) PushTx(args *PushTxArgs, reply *interface{}) error {
err := args.requirementsPushTx()
if err != nil {
return err
}
result, _ := p.xeth.PushTx(args.Tx)
*reply = result
return nil
}
func (p *EthereumApi) GetStateAt(args *GetStateArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
state := p.xeth.State().SafeGet(args.Address)
value := state.StorageString(args.Key)
var hx string
if strings.Index(args.Key, "0x") == 0 {
hx = string([]byte(args.Key)[2:])
} else {
// Convert the incoming string (which is a bigint) into hex
i, _ := new(big.Int).SetString(args.Key, 10)
hx = ethutil.Bytes2Hex(i.Bytes())
}
rpclogger.Debugf("GetStateAt(%s, %s)\n", args.Address, hx)
*reply = map[string]string{args.Key: value.Str()}
return nil
}
func (p *EthereumApi) GetStorageAt(args *GetStorageArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
*reply = p.xeth.State().SafeGet(args.Address).Storage()
return nil
}
func (p *EthereumApi) GetPeerCount(reply *interface{}) error {
*reply = p.xeth.PeerCount()
return nil
}
func (p *EthereumApi) GetIsListening(reply *interface{}) error {
*reply = p.xeth.IsListening()
return nil
}
func (p *EthereumApi) GetCoinbase(reply *interface{}) error {
*reply = p.xeth.Coinbase()
return nil
}
func (p *EthereumApi) Accounts(reply *interface{}) error {
*reply = p.xeth.Accounts()
return nil
}
func (p *EthereumApi) GetIsMining(reply *interface{}) error {
*reply = p.xeth.IsMining()
return nil
}
func (p *EthereumApi) BlockNumber(reply *interface{}) error {
*reply = p.xeth.Backend().ChainManager().CurrentBlock().Number()
return nil
}
func (p *EthereumApi) GetTxCountAt(args *GetTxCountArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
*reply = p.xeth.TxCountAt(args.Address)
return nil
}
func (p *EthereumApi) GetBalanceAt(args *GetBalanceArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
state := p.xeth.State().SafeGet(args.Address)
*reply = toHex(state.Balance().Bytes())
return nil
}
func (p *EthereumApi) GetCodeAt(args *GetCodeAtArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
*reply = p.xeth.CodeAt(args.Address)
return nil
}
func (p *EthereumApi) Sha3(args *Sha3Args, reply *interface{}) error {
*reply = toHex(crypto.Sha3(fromHex(args.Data)))
return nil
}
func (p *EthereumApi) DbPut(args *DbArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
p.db.Put([]byte(args.Database+args.Key), []byte(args.Value))
*reply = true
return nil
}
func (p *EthereumApi) DbGet(args *DbArgs, reply *interface{}) error {
err := args.requirements()
if err != nil {
return err
}
res, _ := p.db.Get([]byte(args.Database + args.Key))
*reply = string(res)
return nil
}
func (p *EthereumApi) NewWhisperIdentity(reply *interface{}) error {
*reply = p.xeth.Whisper().NewIdentity()
return nil
}
func (p *EthereumApi) NewWhisperFilter(args *xeth.Options, reply *interface{}) error {
var id int
args.Fn = func(msg xeth.WhisperMessage) {
p.messagesMut.Lock()
defer p.messagesMut.Unlock()
p.messages[id] = append(p.messages[id], msg)
}
id = p.xeth.Whisper().Watch(args)
*reply = id
return nil
}
func (self *EthereumApi) MessagesChanged(id int, reply *interface{}) error {
self.messagesMut.Lock()
defer self.messagesMut.Unlock()
*reply = self.messages[id]
self.messages[id] = nil // empty the messages
return nil
}
func (p *EthereumApi) WhisperPost(args *WhisperMessageArgs, reply *interface{}) error {
err := p.xeth.Whisper().Post(args.Payload, args.To, args.From, args.Topics, args.Priority, args.Ttl)
if err != nil {
return err
}
*reply = true
return nil
}
func (p *EthereumApi) HasWhisperIdentity(args string, reply *interface{}) error {
*reply = p.xeth.Whisper().HasIdentity(args)
return nil
}
func (p *EthereumApi) WhisperMessages(id int, reply *interface{}) error {
*reply = p.xeth.Whisper().Messages(id)
return nil
}
func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error {
// Spec at https://github.com/ethereum/wiki/wiki/Generic-ON-RPC
rpclogger.DebugDetailf("%T %s", req.Params, req.Params)
switch req.Method {
case "eth_coinbase":
return p.GetCoinbase(reply)
case "eth_listening":
return p.GetIsListening(reply)
case "eth_mining":
return p.GetIsMining(reply)
case "eth_peerCount":
return p.GetPeerCount(reply)
case "eth_number":
return p.BlockNumber(reply)
case "eth_accounts":
return p.Accounts(reply)
case "eth_countAt":
args, err := req.ToGetTxCountArgs()
if err != nil {
return err
}
return p.GetTxCountAt(args, reply)
case "eth_codeAt":
args, err := req.ToGetCodeAtArgs()
if err != nil {
return err
}
return p.GetCodeAt(args, reply)
case "eth_balanceAt":
args, err := req.ToGetBalanceArgs()
if err != nil {
return err
}
return p.GetBalanceAt(args, reply)
case "eth_stateAt":
args, err := req.ToGetStateArgs()
if err != nil {
return err
}
return p.GetStateAt(args, reply)
case "eth_storageAt":
args, err := req.ToStorageAtArgs()
if err != nil {
return err
}
return p.GetStorageAt(args, reply)
case "eth_blockByNumber", "eth_blockByHash":
args, err := req.ToGetBlockArgs()
if err != nil {
return err
}
return p.GetBlock(args, reply)
case "eth_transact":
args, err := req.ToNewTxArgs()
if err != nil {
return err
}
return p.Transact(args, reply)
case "eth_call":
args, err := req.ToNewTxArgs()
if err != nil {
return err
}
return p.Call(args, reply)
case "eth_newFilter":
args, err := req.ToFilterArgs()
if err != nil {
return err
}
return p.NewFilter(args, reply)
case "eth_newFilterString":
args, err := req.ToFilterStringArgs()
if err != nil {
return err
}
return p.NewFilterString(args, reply)
case "eth_changed":
args, err := req.ToFilterChangedArgs()
if err != nil {
return err
}
return p.FilterChanged(args, reply)
case "eth_filterLogs":
args, err := req.ToFilterChangedArgs()
if err != nil {
return err
}
return p.Logs(args, reply)
case "eth_gasPrice":
*reply = defaultGasPrice
return nil
case "eth_register":
args, err := req.ToRegisterArgs()
if err != nil {
return err
}
return p.Register(args, reply)
case "eth_unregister":
args, err := req.ToRegisterArgs()
if err != nil {
return err
}
return p.Unregister(args, reply)
case "eth_watchTx":
args, err := req.ToWatchTxArgs()
if err != nil {
return err
}
return p.WatchTx(args, reply)
case "web3_sha3":
args, err := req.ToSha3Args()
if err != nil {
return err
}
return p.Sha3(args, reply)
case "db_put":
args, err := req.ToDbPutArgs()
if err != nil {
return err
}
return p.DbPut(args, reply)
case "db_get":
args, err := req.ToDbGetArgs()
if err != nil {
return err
}
return p.DbGet(args, reply)
case "shh_newIdentity":
return p.NewWhisperIdentity(reply)
case "shh_newFilter":
args, err := req.ToWhisperFilterArgs()
if err != nil {
return err
}
return p.NewWhisperFilter(args, reply)
case "shh_changed":
args, err := req.ToWhisperIdArgs()
if err != nil {
return err
}
return p.MessagesChanged(args, reply)
case "shh_post":
args, err := req.ToWhisperPostArgs()
if err != nil {
return err
}
return p.WhisperPost(args, reply)
case "shh_haveIdentity":
args, err := req.ToWhisperHasIdentityArgs()
if err != nil {
return err
}
return p.HasWhisperIdentity(args, reply)
case "shh_getMessages":
args, err := req.ToWhisperIdArgs()
if err != nil {
return err
}
return p.WhisperMessages(args, reply)
default:
return NewErrorResponse(fmt.Sprintf("%v %s", ErrorNotImplemented, req.Method))
}
rpclogger.DebugDetailf("Reply: %T %s", reply, reply)
return nil
}
