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package main
import (
"fmt"
"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethpub"
"github.com/ethereum/eth-go/ethstate"
"github.com/ethereum/eth-go/ethutil"
"github.com/go-qml/qml"
)
type AppContainer interface {
Create() error
Destroy()
Window() *qml.Window
Engine() *qml.Engine
NewBlock(*ethchain.Block)
ObjectChanged(*ethstate.StateObject)
StorageChanged(*ethstate.StorageState)
NewWatcher(chan bool)
}
type ExtApplication struct {
*ethpub.PEthereum
blockChan chan ethutil.React
changeChan chan ethutil.React
quitChan chan bool
watcherQuitChan chan bool
container AppContainer
lib *UiLib
registeredEvents []string
}
func NewExtApplication(container AppContainer, lib *UiLib) *ExtApplication {
app := &ExtApplication{
ethpub.NewPEthereum(lib.eth),
make(chan ethutil.React, 1),
make(chan ethutil.React, 1),
make(chan bool),
make(chan bool),
container,
lib,
nil,
}
return app
}
func (app *ExtApplication) run() {
// Set the "eth" api on to the containers context
context := app.container.Engine().Context()
context.SetVar("eth", app)
context.SetVar("ui", app.lib)
err := app.container.Create()
if err != nil {
fmt.Println(err)
return
}
// Call the main loop
go app.mainLoop()
// Subscribe to events
reactor := app.lib.eth.Reactor()
reactor.Subscribe("newBlock", app.blockChan)
app.container.NewWatcher(app.watcherQuitChan)
win := app.container.Window()
win.Show()
win.Wait()
app.stop()
}
func (app *ExtApplication) stop() {
// Clean up
reactor := app.lib.eth.Reactor()
reactor.Unsubscribe("newBlock", app.blockChan)
for _, event := range app.registeredEvents {
reactor.Unsubscribe(event, app.changeChan)
}
// Kill the main loop
app.quitChan <- true
app.watcherQuitChan <- true
close(app.blockChan)
close(app.quitChan)
close(app.changeChan)
app.container.Destroy()
}
func (app *ExtApplication) mainLoop() {
out:
for {
select {
case <-app.quitChan:
break out
case block := <-app.blockChan:
if block, ok := block.Resource.(*ethchain.Block); ok {
app.container.NewBlock(block)
}
case object := <-app.changeChan:
if stateObject, ok := object.Resource.(*ethstate.StateObject); ok {
app.container.ObjectChanged(stateObject)
} else if storageObject, ok := object.Resource.(*ethstate.StorageState); ok {
app.container.StorageChanged(storageObject)
}
}
}
}
func (app *ExtApplication) Watch(addr, storageAddr string) {
var event string
if len(storageAddr) == 0 {
event = "object:" + string(ethutil.Hex2Bytes(addr))
app.lib.eth.Reactor().Subscribe(event, app.changeChan)
} else {
event = "storage:" + string(ethutil.Hex2Bytes(addr)) + ":" + string(ethutil.Hex2Bytes(storageAddr))
app.lib.eth.Reactor().Subscribe(event, app.changeChan)
}
app.registeredEvents = append(app.registeredEvents, event)
}
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