1 files changed, 215 insertions, 0 deletions
diff --git a/javascript/javascript_runtime.go b/javascript/javascript_runtime.go
new file mode 100644
index 000000000..beaca45b9
--- /dev/null
+++ b/javascript/javascript_runtime.go
@@ -0,0 +1,215 @@
+package javascript
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/state"
+	"github.com/ethereum/go-ethereum/xeth"
+	"github.com/obscuren/otto"
+)
+
+var jsrelogger = logger.NewLogger("JSRE")
+
+type JSRE struct {
+	ethereum *eth.Ethereum
+	Vm       *otto.Otto
+	xeth     *xeth.XEth
+
+	events event.Subscription
+
+	objectCb map[string][]otto.Value
+}
+
+func (jsre *JSRE) LoadExtFile(path string) {
+	result, err := ioutil.ReadFile(path)
+	if err == nil {
+		jsre.Vm.Run(result)
+	} else {
+		jsrelogger.Infoln("Could not load file:", path)
+	}
+}
+
+func (jsre *JSRE) LoadIntFile(file string) {
+	assetPath := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist", "assets", "ext")
+	jsre.LoadExtFile(path.Join(assetPath, file))
+}
+
+func NewJSRE(ethereum *eth.Ethereum) *JSRE {
+	re := &JSRE{
+		ethereum,
+		otto.New(),
+		xeth.New(ethereum),
+		nil,
+		make(map[string][]otto.Value),
+	}
+
+	// Init the JS lib
+	re.Vm.Run(jsLib)
+
+	// Load extra javascript files
+	re.LoadIntFile("bignumber.min.js")
+
+	// Subscribe to events
+	mux := ethereum.EventMux()
+	re.events = mux.Subscribe(core.NewBlockEvent{})
+
+	// We have to make sure that, whoever calls this, calls "Stop"
+	go re.mainLoop()
+
+	re.Bind("eth", &JSEthereum{re.xeth, re.Vm, ethereum})
+
+	re.initStdFuncs()
+
+	jsrelogger.Infoln("started")
+
+	return re
+}
+
+func (self *JSRE) Bind(name string, v interface{}) {
+	self.Vm.Set(name, v)
+}
+
+func (self *JSRE) Run(code string) (otto.Value, error) {
+	return self.Vm.Run(code)
+}
+
+func (self *JSRE) Require(file string) error {
+	if len(filepath.Ext(file)) == 0 {
+		file += ".js"
+	}
+
+	fh, err := os.Open(file)
+	if err != nil {
+		return err
+	}
+
+	content, _ := ioutil.ReadAll(fh)
+	self.Run("exports = {};(function() {" + string(content) + "})();")
+
+	return nil
+}
+
+func (self *JSRE) Stop() {
+	self.events.Unsubscribe()
+	jsrelogger.Infoln("stopped")
+}
+
+func (self *JSRE) mainLoop() {
+	for _ = range self.events.Chan() {
+	}
+}
+
+func (self *JSRE) initStdFuncs() {
+	t, _ := self.Vm.Get("eth")
+	eth := t.Object()
+	eth.Set("connect", self.connect)
+	eth.Set("require", self.require)
+	eth.Set("stopMining", self.stopMining)
+	eth.Set("startMining", self.startMining)
+	eth.Set("dump", self.dump)
+	eth.Set("export", self.export)
+}
+
+/*
+ * The following methods are natively implemented javascript functions
+ */
+
+func (self *JSRE) dump(call otto.FunctionCall) otto.Value {
+	var block *types.Block
+
+	if len(call.ArgumentList) > 0 {
+		if call.Argument(0).IsNumber() {
+			num, _ := call.Argument(0).ToInteger()
+			block = self.ethereum.ChainManager().GetBlockByNumber(uint64(num))
+		} else if call.Argument(0).IsString() {
+			hash, _ := call.Argument(0).ToString()
+			block = self.ethereum.ChainManager().GetBlock(ethutil.Hex2Bytes(hash))
+		} else {
+			fmt.Println("invalid argument for dump. Either hex string or number")
+		}
+
+		if block == nil {
+			fmt.Println("block not found")
+
+			return otto.UndefinedValue()
+		}
+
+	} else {
+		block = self.ethereum.ChainManager().CurrentBlock()
+	}
+
+	statedb := state.New(block.Root(), self.ethereum.Db())
+
+	v, _ := self.Vm.ToValue(statedb.RawDump())
+
+	return v
+}
+
+func (self *JSRE) stopMining(call otto.FunctionCall) otto.Value {
+	v, _ := self.Vm.ToValue(utils.StopMining(self.ethereum))
+	return v
+}
+
+func (self *JSRE) startMining(call otto.FunctionCall) otto.Value {
+	v, _ := self.Vm.ToValue(utils.StartMining(self.ethereum))
+	return v
+}
+
+func (self *JSRE) connect(call otto.FunctionCall) otto.Value {
+	nodeURL, err := call.Argument(0).ToString()
+	if err != nil {
+		return otto.FalseValue()
+	}
+	if err := self.ethereum.SuggestPeer(nodeURL); err != nil {
+		return otto.FalseValue()
+	}
+	return otto.TrueValue()
+}
+
+func (self *JSRE) require(call otto.FunctionCall) otto.Value {
+	file, err := call.Argument(0).ToString()
+	if err != nil {
+		return otto.UndefinedValue()
+	}
+	if err := self.Require(file); err != nil {
+		fmt.Println("err:", err)
+		return otto.UndefinedValue()
+	}
+
+	t, _ := self.Vm.Get("exports")
+
+	return t
+}
+
+func (self *JSRE) export(call otto.FunctionCall) otto.Value {
+	if len(call.ArgumentList) == 0 {
+		fmt.Println("err: require file name")
+		return otto.FalseValue()
+	}
+
+	fn, err := call.Argument(0).ToString()
+	if err != nil {
+		fmt.Println(err)
+		return otto.FalseValue()
+	}
+
+	data := self.ethereum.ChainManager().Export()
+
+	if err := ethutil.WriteFile(fn, data); err != nil {
+		fmt.Println(err)
+		return otto.FalseValue()
+	}
+
+	return otto.TrueValue()
+}