Reimplemented message filters for rpc calls

cmd/mist/assets/ext/ethereum.js/example/balance.html

@@ -17,7 +17,7 @@
         var originalBalance = web3.toDecimal(balance);
         document.getElementById('original').innerText = 'original balance: ' + originalBalance + '    watching...';
 
-        web3.eth.watch({altered: coinbase}).changed(function() {
+        var filter = web3.eth.watch({address: coinbase}).changed(function() {
             balance = web3.eth.balanceAt(coinbase)
             var currentBalance = web3.toDecimal(balance);
             document.getElementById("current").innerText = 'current: ' + currentBalance;

core/filter.go

@@ -12,6 +12,17 @@ type AccountChange struct {
 	Address, StateAddress []byte
 }
 
+type FilterOptions struct {
+	Earliest int64
+	Latest   int64
+
+	Address []byte
+	Topics  [][]byte
+
+	Skip int
+	Max  int
+}
+
 // Filtering interface
 type Filter struct {
 	eth      EthManager
@@ -32,6 +43,16 @@ func NewFilter(eth EthManager) *Filter {
 	return &Filter{eth: eth}
 }
 
+func (self *Filter) SetOptions(options FilterOptions) {
+	self.earliest = options.Earliest
+	self.latest = options.Latest
+	self.skip = options.Skip
+	self.max = options.Max
+	self.address = options.Address
+	self.topics = options.Topics
+
+}
+
 // Set the earliest and latest block for filtering.
 // -1 = latest block (i.e., the current block)
 // hash = particular hash from-to

rpc/args.go

 package rpc
 
 import "encoding/json"
+import "github.com/ethereum/go-ethereum/core"
 
 type GetBlockArgs struct {
 	BlockNumber int32
@@ -36,10 +37,6 @@ type NewTxArgs struct {
 	Data     string `json:"data"`
 }
 
-// type TxResponse struct {
-//  Hash string
-// }
-
 func (a *NewTxArgs) requirements() error {
 	if a.Gas == "" {
 		return NewErrorResponse("Transact requires a 'gas' value as argument")
@@ -195,3 +192,29 @@ func (obj *Sha3Args) UnmarshalJSON(b []byte) (err error) {
 	}
 	return
 }
+
+type FilterOptions struct {
+	Earliest int64
+	Latest   int64
+	Address  string
+	Topics   []string
+	Skip     int
+	Max      int
+}
+
+func toFilterOptions(options *FilterOptions) core.FilterOptions {
+	var opts core.FilterOptions
+	opts.Earliest = options.Earliest
+	opts.Latest = options.Latest
+	opts.Address = fromHex(options.Address)
+	opts.Topics = make([][]byte, len(options.Topics))
+	for i, topic := range options.Topics {
+		opts.Topics[i] = fromHex(topic)
+	}
+
+	return opts
+}
+
+type FilterChangedArgs struct {
+	n int
+}

rpc/message.go

@@ -21,6 +21,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+
+	"github.com/ethereum/go-ethereum/state"
 )
 
 const (
@@ -184,3 +186,56 @@ func (req *RpcRequest) ToGetCodeAtArgs() (*GetCodeAtArgs, error) {
 	rpclogger.DebugDetailf("%T %v", args, args)
 	return args, nil
 }
+
+func (req *RpcRequest) ToFilterArgs() (*FilterOptions, error) {
+	if len(req.Params) < 1 {
+		return nil, NewErrorResponse(ErrorArguments)
+	}
+
+	args := new(FilterOptions)
+	r := bytes.NewReader(req.Params[0])
+	err := json.NewDecoder(r).Decode(args)
+	if err != nil {
+		return nil, NewErrorResponse(ErrorDecodeArgs)
+	}
+	rpclogger.DebugDetailf("%T %v", args, args)
+	return args, nil
+}
+
+func (req *RpcRequest) ToFilterChangedArgs() (int, error) {
+	if len(req.Params) < 1 {
+		return 0, NewErrorResponse(ErrorArguments)
+	}
+
+	var id int
+	r := bytes.NewReader(req.Params[0])
+	err := json.NewDecoder(r).Decode(&id)
+	if err != nil {
+		return 0, NewErrorResponse(ErrorDecodeArgs)
+	}
+	rpclogger.DebugDetailf("%T %v", id, id)
+	return id, nil
+}
+
+type Log struct {
+	Address string   `json:"address"`
+	Topics  []string `json:"topics"`
+	Data    string   `json:"data"`
+}
+
+func toLogs(logs state.Logs) (ls []Log) {
+	ls = make([]Log, len(logs))
+
+	for i, log := range logs {
+		var l Log
+		l.Topics = make([]string, len(log.Topics()))
+		l.Address = toHex(log.Address())
+		l.Data = toHex(log.Data())
+		for j, topic := range log.Topics() {
+			l.Topics[j] = toHex(topic)
+		}
+		ls[i] = l
+	}
+
+	return
+}

rpc/packages.go

@@ -29,9 +29,13 @@ import (
 	"fmt"
 	"math/big"
 	"strings"
+	"sync"
 
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/crypto"
 	"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"
 )
 
@@ -53,12 +57,79 @@ type RpcServer interface {
 	Stop()
 }
 
+type EthereumApi struct {
+	xeth          *xeth.XEth
+	filterManager *filter.FilterManager
+
+	mut  sync.RWMutex
+	logs map[int]state.Logs
+}
+
 func NewEthereumApi(xeth *xeth.XEth) *EthereumApi {
-	return &EthereumApi{xeth: xeth}
+	api := &EthereumApi{
+		xeth:          xeth,
+		filterManager: filter.NewFilterManager(xeth.Backend().EventMux()),
+		logs:          make(map[int]state.Logs),
+	}
+	go api.filterManager.Start()
+
+	return api
 }
 
-type EthereumApi struct {
-	xeth *xeth.XEth
+func (self *EthereumApi) NewFilter(args *FilterOptions, reply *interface{}) error {
+	var id int
+	filter := core.NewFilter(self.xeth.Backend())
+	filter.LogsCallback = func(logs state.Logs) {
+		self.mut.Lock()
+		defer self.mut.Unlock()
+
+		self.logs[id] = append(self.logs[id], logs...)
+	}
+	id = self.filterManager.InstallFilter(filter)
+	*reply = id
+
+	return nil
+}
+
+type Log struct {
+	Address string   `json:"address"`
+	Topics  []string `json:"topics"`
+	Data    string   `json:"data"`
+}
+
+func toLogs(logs state.Logs) (ls []Log) {
+	ls = make([]Log, len(logs))
+
+	for i, log := range logs {
+		var l Log
+		l.Topics = make([]string, len(log.Topics()))
+		l.Address = toHex(log.Address())
+		l.Data = toHex(log.Data())
+		for j, topic := range log.Topics() {
+			l.Topics[j] = toHex(topic)
+		}
+		ls[i] = l
+	}
+
+	return
+}
+
+func (self *EthereumApi) FilterChanged(id int, reply *interface{}) error {
+	self.mut.RLock()
+	defer self.mut.RUnlock()
+
+	*reply = toLogs(self.logs[id])
+
+	self.logs[id] = nil // empty the logs
+
+	return nil
+}
+
+func (self *EthereumApi) Logs(id int, reply *interface{}) error {
+	filter := self.filterManager.GetFilter(id)
+	*reply = toLogs(filter.Find())
+
+	return nil
 }
 
 func (p *EthereumApi) GetBlock(args *GetBlockArgs, reply *interface{}) error {
@@ -162,7 +233,7 @@ func (p *EthereumApi) GetBalanceAt(args *GetBalanceArgs, reply *interface{}) err
 		return err
 	}
 	state := p.xeth.State().SafeGet(args.Address)
-	*reply = BalanceRes{Balance: state.Balance().String(), Address: args.Address}
+	*reply = toHex(state.Balance().Bytes())
 	return nil
 }
 
@@ -234,6 +305,18 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 			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_changed":
+		args, err := req.ToFilterChangedArgs()
+		if err != nil {
+			return err
+		}
+		return p.FilterChanged(args, reply)
 	case "web3_sha3":
 		args, err := req.ToSha3Args()
 		if err != nil {

xeth/xeth.go

@@ -12,7 +12,9 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/state"
 )
 
@@ -22,19 +24,22 @@ var pipelogger = logger.NewLogger("XETH")
 type Backend interface {
 	BlockProcessor() *core.BlockProcessor
 	ChainManager() *core.ChainManager
-	KeyManager() *crypto.KeyManager
+	TxPool() *core.TxPool
+	PeerCount() int
 	IsMining() bool
 	IsListening() bool
-	PeerCount() int
+	Peers() []*p2p.Peer
+	KeyManager() *crypto.KeyManager
+	ClientIdentity() p2p.ClientIdentity
 	Db() ethutil.Database
-	TxPool() *core.TxPool
+	EventMux() *event.TypeMux
 }
 
 type XEth struct {
 	eth            Backend
 	blockProcessor *core.BlockProcessor
 	chainManager   *core.ChainManager
-	world          *State
+	state          *State
 }
 
 func New(eth Backend) *XEth {
@@ -43,12 +48,16 @@ func New(eth Backend) *XEth {
 		blockProcessor: eth.BlockProcessor(),
 		chainManager:   eth.ChainManager(),
 	}
-	xeth.world = NewState(xeth)
+	xeth.state = NewState(xeth)
 
 	return xeth
 }
 
-func (self *XEth) State() *State { return self.world }
+func (self *XEth) Backend() Backend {
+	return self.eth
+}
+
+func (self *XEth) State() *State { return self.state }
 
 func (self *XEth) BlockByHash(strHash string) *Block {
 	hash := fromHex(strHash)