Improved console

* Added watch

ethereum/javascript_console.go

@@ -3,7 +3,9 @@ package main
 import (
 	"fmt"
 	"github.com/ethereum/eth-go"
+	"github.com/ethereum/eth-go/ethchain"
 	"github.com/ethereum/eth-go/ethpub"
+	"github.com/ethereum/eth-go/ethutil"
 	"github.com/robertkrimen/otto"
 )
 
@@ -12,18 +14,83 @@ type Repl interface {
 }
 
 type JSRE struct {
-	vm  *otto.Otto
-	lib *ethpub.PEthereum
+	ethereum *eth.Ethereum
+	vm       *otto.Otto
+	lib      *ethpub.PEthereum
+
+	blockChan  chan ethutil.React
+	changeChan chan ethutil.React
+	quitChan   chan bool
+
+	objectCb map[string][]otto.Value
 }
 
 func NewJSRE(ethereum *eth.Ethereum) *JSRE {
-	re := &JSRE{vm: otto.New(), lib: ethpub.NewPEthereum(ethereum)}
+	re := &JSRE{
+		ethereum,
+		otto.New(),
+		ethpub.NewPEthereum(ethereum),
+		make(chan ethutil.React, 1),
+		make(chan ethutil.React, 1),
+		make(chan bool),
+		make(map[string][]otto.Value),
+	}
+
+	// We have to make sure that, whoever calls this, calls "Stop"
+	go re.mainLoop()
 
 	re.Bind("eth", &JSEthereum{re.lib, re.vm})
+	t, _ := re.vm.Get("eth")
+	t.Object().Set("watch", func(call otto.FunctionCall) otto.Value {
+		addr, _ := call.Argument(0).ToString()
+		cb := call.Argument(1)
+
+		re.objectCb[addr] = append(re.objectCb[addr], cb)
+
+		event := "object:" + string(ethutil.FromHex(addr))
+		ethereum.Reactor().Subscribe(event, re.changeChan)
+
+		return otto.UndefinedValue()
+	})
 
 	return re
 }
 
+func (self *JSRE) Stop() {
+	// Kill the main loop
+	self.quitChan <- true
+
+	close(self.blockChan)
+	close(self.quitChan)
+	close(self.changeChan)
+}
+
+func (self *JSRE) mainLoop() {
+	// Subscribe to events
+	reactor := self.ethereum.Reactor()
+	reactor.Subscribe("newBlock", self.blockChan)
+
+out:
+	for {
+		select {
+		case <-self.quitChan:
+			break out
+		case block := <-self.blockChan:
+			if _, ok := block.Resource.(*ethchain.Block); ok {
+			}
+		case object := <-self.changeChan:
+			if stateObject, ok := object.Resource.(*ethchain.StateObject); ok {
+				for _, cb := range self.objectCb[ethutil.Hex(stateObject.Address())] {
+					val, _ := self.vm.ToValue(ethpub.NewPStateObject(stateObject))
+					cb.Call(cb, val)
+				}
+			} else if storageObject, ok := object.Resource.(*ethchain.StorageState); ok {
+				fmt.Println(storageObject)
+			}
+		}
+	}
+}
+
 func (self *JSRE) Bind(name string, v interface{}) {
 	self.vm.Set(name, v)
 }
@@ -99,7 +166,6 @@ func (self *JSEthereum) Create(key, valueStr, gasStr, gasPriceStr, initStr, body
 	return self.toVal(r)
 }
 
-// Wrapper function
 func (self *JSEthereum) toVal(v interface{}) otto.Value {
 	result, err := self.vm.ToValue(v)