1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
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/obscuren/otto"
"io/ioutil"
"os"
"path/filepath"
)
type JSRE struct {
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{
ethereum,
otto.New(),
ethpub.NewPEthereum(ethereum),
make(chan ethutil.React, 1),
make(chan ethutil.React, 1),
make(chan bool),
make(map[string][]otto.Value),
}
// Init the JS lib
re.vm.Run(jsLib)
// We have to make sure that, whoever calls this, calls "Stop"
go re.mainLoop()
re.Bind("eth", &JSEthereum{re.lib, re.vm})
re.initStdFuncs()
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() {
// 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 {
for _, cb := range self.objectCb[ethutil.Hex(storageObject.StateAddress)+ethutil.Hex(storageObject.Address)] {
val, _ := self.vm.ToValue(ethpub.NewPStorageState(storageObject))
cb.Call(cb, val)
}
}
}
}
}
func (self *JSRE) initStdFuncs() {
t, _ := self.vm.Get("eth")
eth := t.Object()
eth.Set("watch", self.watch)
eth.Set("addPeer", self.addPeer)
eth.Set("require", self.require)
}
/*
* The following methods are natively implemented javascript functions
*/
// eth.watch
func (self JSRE) watch(call otto.FunctionCall) otto.Value {
addr, _ := call.Argument(0).ToString()
var storageAddr string
var cb otto.Value
var storageCallback bool
if len(call.ArgumentList) > 2 {
storageCallback = true
storageAddr, _ = call.Argument(1).ToString()
cb = call.Argument(2)
} else {
cb = call.Argument(1)
}
if storageCallback {
self.objectCb[addr+storageAddr] = append(self.objectCb[addr+storageAddr], cb)
event := "storage:" + string(ethutil.FromHex(addr)) + ":" + string(ethutil.FromHex(storageAddr))
self.ethereum.Reactor().Subscribe(event, self.changeChan)
} else {
self.objectCb[addr] = append(self.objectCb[addr], cb)
event := "object:" + string(ethutil.FromHex(addr))
self.ethereum.Reactor().Subscribe(event, self.changeChan)
}
return otto.UndefinedValue()
}
func (self *JSRE) addPeer(call otto.FunctionCall) otto.Value {
host, err := call.Argument(0).ToString()
if err != nil {
return otto.FalseValue()
}
self.ethereum.ConnectToPeer(host)
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
}
|
