Added element syncrhonization

pkg/runtime/values/array.go

@@ -149,3 +149,18 @@ func (t *Array) IndexOf(item core.Value) Int {
 
 	return res
 }
+
+func (t *Array) Insert(idx Int, value core.Value) {
+	t.value = append(t.value[:idx], append([]core.Value{value}, t.value[idx:]...)...)
+}
+
+func (t *Array) RemoveAt(idx Int) {
+	i := int(idx)
+	max := len(t.value) - 1
+
+	if i > max {
+		return
+	}
+
+	t.value = append(t.value[:i], t.value[i+1:]...)
+}

pkg/runtime/values/array_test.go

@@ -271,4 +271,89 @@ func TestArray(t *testing.T) {
 			So(len(s2), ShouldEqual, arr.Length()-2)
 		})
 	})
+
+	Convey(".Insert", t, func() {
+		Convey("Should insert an item in the middle of an array", func() {
+			arr := values.NewArrayWith(
+				values.NewInt(0),
+				values.NewInt(1),
+				values.NewInt(2),
+				values.NewInt(3),
+				values.NewInt(4),
+				values.NewInt(5),
+			)
+
+			lenBefore := arr.Length()
+
+			arr.Insert(3, values.NewInt(100))
+
+			lenAfter := arr.Length()
+
+			So(lenAfter, ShouldBeGreaterThan, lenBefore)
+			So(arr.Get(3), ShouldEqual, 100)
+		})
+	})
+
+	Convey(".RemoveAt", t, func() {
+		Convey("Should remove an item from the middle", func() {
+			arr := values.NewArrayWith(
+				values.NewInt(0),
+				values.NewInt(1),
+				values.NewInt(2),
+				values.NewInt(3),
+				values.NewInt(4),
+				values.NewInt(5),
+			)
+
+			lenBefore := arr.Length()
+
+			arr.RemoveAt(3)
+
+			lenAfter := arr.Length()
+
+			So(lenAfter, ShouldBeLessThan, lenBefore)
+			So(arr.Get(3), ShouldEqual, 4)
+		})
+
+		Convey("Should remove an item from the end", func() {
+			arr := values.NewArrayWith(
+				values.NewInt(0),
+				values.NewInt(1),
+				values.NewInt(2),
+				values.NewInt(3),
+				values.NewInt(4),
+				values.NewInt(5),
+			)
+
+			lenBefore := arr.Length()
+
+			arr.RemoveAt(5)
+
+			lenAfter := arr.Length()
+
+			So(lenAfter, ShouldBeLessThan, lenBefore)
+			So(lenAfter, ShouldEqual, 5)
+			So(arr.Get(4), ShouldEqual, 4)
+		})
+
+		Convey("Should remove an item from the beginning", func() {
+			arr := values.NewArrayWith(
+				values.NewInt(0),
+				values.NewInt(1),
+				values.NewInt(2),
+				values.NewInt(3),
+				values.NewInt(4),
+				values.NewInt(5),
+			)
+
+			lenBefore := arr.Length()
+
+			arr.RemoveAt(0)
+
+			lenAfter := arr.Length()
+
+			So(lenAfter, ShouldBeLessThan, lenBefore)
+			So(arr.Get(0), ShouldEqual, 1)
+		})
+	})
 }

pkg/runtime/values/object.go

@@ -150,6 +150,10 @@ func (t *Object) Set(key String, value core.Value) {
 	}
 }
 
+func (t *Object) Remove(key String) {
+	delete(t.value, string(key))
+}
+
 func (t *Object) SetIn(path []core.Value, value core.Value) error {
 	return SetIn(t, path, value)
 }

pkg/stdlib/html/driver/common/lazy-value.go

@@ -27,6 +27,13 @@ func NewLazyValue(factory LazyFactory) *LazyValue {
 	return lz
 }
 
+func (lv *LazyValue) Ready() bool {
+	lv.Lock()
+	defer lv.Unlock()
+
+	return lv.ready
+}
+
 func (lv *LazyValue) Value() (core.Value, error) {
 	lv.Lock()
 	defer lv.Unlock()

pkg/stdlib/html/driver/common/sync-value.go

@@ -0,0 +1,32 @@
+package common
+
+import (
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+	"sync"
+)
+
+type SyncValue struct {
+	sync.Mutex
+	value core.Value
+}
+
+func NewSyncValue(init core.Value) *SyncValue {
+	val := new(SyncValue)
+	val.value = init
+
+	return val
+}
+
+func (sv *SyncValue) Get() core.Value {
+	sv.Lock()
+	defer sv.Unlock()
+
+	return sv.value
+}
+
+func (sv *SyncValue) Set(val core.Value) {
+	sv.Lock()
+	defer sv.Unlock()
+
+	sv.value = val
+}

pkg/stdlib/html/driver/dynamic/element.go

@@ -23,11 +23,11 @@ type HtmlElement struct {
 	sync.Mutex
 	client         *cdp.Client
 	broker         *events.EventBroker
-	connected      bool
+	connected      *common.SyncValue
 	id             dom.NodeID
 	nodeType       values.Int
 	nodeName       values.String
-	innerHtml      values.String
+	innerHtml      *common.SyncValue
 	innerText      *common.LazyValue
 	value          string
 	attributes     *common.LazyValue
@@ -53,17 +53,14 @@ func LoadElement(
 		dom.
 			NewDescribeNodeArgs().
 			SetNodeID(id).
-			SetDepth(-1),
+			SetDepth(1),
 	)
 
 	if err != nil {
 		return nil, core.Error(err, strconv.Itoa(int(id)))
 	}
 
-	innerHtml, err := client.DOM.GetOuterHTML(
-		ctx,
-		dom.NewGetOuterHTMLArgs().SetNodeID(id),
-	)
+	innerHtml, err := loadInnerHtml(client, id)
 
 	if err != nil {
 		return nil, core.Error(err, strconv.Itoa(int(id)))
@@ -74,7 +71,7 @@ func LoadElement(
 		broker,
 		id,
 		node.Node,
-		values.NewString(innerHtml.OuterHTML),
+		innerHtml,
 	), nil
 }
 
@@ -88,11 +85,11 @@ func NewHtmlElement(
 	el := new(HtmlElement)
 	el.client = client
 	el.broker = broker
-	el.connected = true
+	el.connected = common.NewSyncValue(values.True)
 	el.id = id
 	el.nodeType = values.NewInt(node.NodeType)
 	el.nodeName = values.NewString(node.NodeName)
-	el.innerHtml = innerHtml
+	el.innerHtml = common.NewSyncValue(innerHtml)
 	el.innerText = common.NewLazyValue(func() (core.Value, error) {
 		h := el.InnerHtml()
 
@@ -115,24 +112,235 @@ func NewHtmlElement(
 	})
 	el.value = ""
 	el.loadedChildren = common.NewLazyValue(func() (core.Value, error) {
+		if !el.IsConnected() {
+			return values.NewArray(0), nil
+		}
+
 		return loadNodes(client, broker, el.children)
 	})
 
-	var childCount int
-
-	if node.ChildNodeCount != nil {
-		childCount = *node.ChildNodeCount
-	}
-
 	if node.Value != nil {
 		el.value = *node.Value
 	}
 
-	el.children = make([]dom.NodeID, childCount)
+	el.children = createChildrenArray(node.Children)
 
-	for idx, child := range node.Children {
-		el.children[idx] = child.NodeID
-	}
+	broker.AddEventListener("reload", func(_ interface{}) {
+		el.connected.Set(values.False)
+	})
+
+	broker.AddEventListener("attr:modified", func(message interface{}) {
+		reply, ok := message.(*dom.AttributeModifiedReply)
+
+		// well....
+		if !ok {
+			return
+		}
+
+		// it's not for this element
+		if reply.NodeID != el.id {
+			return
+		}
+
+		// they are not event loaded
+		// just ignore the event
+		if !el.attributes.Ready() {
+			return
+		}
+
+		val, err := el.attributes.Value()
+
+		// failed to load
+		// TODO: Log
+		if err != nil {
+			return
+		}
+
+		attrs, ok := val.(*values.Object)
+
+		// TODO: Log
+		if !ok {
+			return
+		}
+
+		// TODO: actually, we need to sync it too...
+		attrs.Set(values.NewString(reply.Name), values.NewString(reply.Value))
+	})
+
+	broker.AddEventListener("attr:removed", func(message interface{}) {
+		reply, ok := message.(*dom.AttributeRemovedReply)
+
+		// well....
+		if !ok {
+			return
+		}
+
+		// it's not for this element
+		if reply.NodeID != el.id {
+			return
+		}
+
+		// they are not event loaded
+		// just ignore the event
+		if !el.attributes.Ready() {
+			return
+		}
+
+		val, err := el.attributes.Value()
+
+		// failed to load
+		// TODO: Log
+		if err != nil {
+			return
+		}
+
+		attrs, ok := val.(*values.Object)
+
+		// TODO: Log
+		if !ok {
+			return
+		}
+
+		// TODO: actually, we need to sync it too...
+		attrs.Remove(values.NewString(reply.Name))
+	})
+
+	broker.AddEventListener("children:count", func(message interface{}) {
+		reply, ok := message.(*dom.ChildNodeCountUpdatedReply)
+
+		if !ok {
+			return
+		}
+
+		if reply.NodeID != el.id {
+			return
+		}
+
+		node, err := client.DOM.DescribeNode(context.Background(), dom.NewDescribeNodeArgs())
+
+		if err != nil {
+			return
+		}
+
+		el.Lock()
+		defer el.Unlock()
+
+		el.children = createChildrenArray(node.Node.Children)
+	})
+
+	broker.AddEventListener("children:inserted", func(message interface{}) {
+		reply, ok := message.(*dom.ChildNodeInsertedReply)
+
+		if !ok {
+			return
+		}
+
+		if reply.ParentNodeID != el.id {
+			return
+		}
+
+		targetIdx := -1
+		prevId := reply.PreviousNodeID
+		nextId := reply.Node.NodeID
+
+		el.Lock()
+		defer el.Unlock()
+
+		for idx, id := range el.children {
+			if id == prevId {
+				targetIdx = idx
+				break
+			}
+		}
+
+		if targetIdx == -1 {
+			return
+		}
+
+		arr := el.children
+		el.children = append(arr[:targetIdx], append([]dom.NodeID{nextId}, arr[targetIdx:]...)...)
+
+		if !el.loadedChildren.Ready() {
+			return
+		}
+
+		loaded, err := el.loadedChildren.Value()
+
+		if err != nil {
+			return
+		}
+
+		loadedArr := loaded.(*values.Array)
+
+		loadedEl, err := LoadElement(el.client, el.broker, nextId)
+
+		if err != nil {
+			return
+		}
+
+		loadedArr.Insert(values.NewInt(targetIdx), loadedEl)
+
+		newInnerHtml, err := loadInnerHtml(el.client, el.id)
+
+		if err != nil {
+			return
+		}
+
+		el.innerHtml.Set(newInnerHtml)
+	})
+
+	broker.AddEventListener("children:deleted", func(message interface{}) {
+		reply, ok := message.(*dom.ChildNodeRemovedReply)
+
+		if !ok {
+			return
+		}
+
+		if reply.ParentNodeID != el.id {
+			return
+		}
+
+		targetIdx := -1
+		targetId := reply.NodeID
+
+		el.Lock()
+		defer el.Unlock()
+
+		for idx, id := range el.children {
+			if id == targetId {
+				targetIdx = idx
+				break
+			}
+		}
+
+		if targetIdx == -1 {
+			return
+		}
+
+		arr := el.children
+		el.children = append(arr[:targetIdx], arr[targetIdx+1:]...)
+
+		if !el.loadedChildren.Ready() {
+			return
+		}
+
+		loaded, err := el.loadedChildren.Value()
+
+		if err != nil {
+			return
+		}
+
+		loadedArr := loaded.(*values.Array)
+		loadedArr.RemoveAt(values.NewInt(targetIdx))
+
+		newInnerHtml, err := loadInnerHtml(el.client, el.id)
+
+		if err != nil {
+			return
+		}
+
+		el.innerHtml.Set(newInnerHtml)
+	})
 
 	return el
 }
@@ -325,7 +533,7 @@ func (el *HtmlElement) InnerText() values.String {
 }
 
 func (el *HtmlElement) InnerHtml() values.String {
-	return el.innerHtml
+	return el.innerHtml.Get().(values.String)
 }
 
 func (el *HtmlElement) Click() (values.Boolean, error) {
@@ -335,3 +543,7 @@ func (el *HtmlElement) Click() (values.Boolean, error) {
 
 	return events.DispatchEvent(ctx, el.client, el.id, "click")
 }
+
+func (el *HtmlElement) IsConnected() values.Boolean {
+	return el.connected.Get().(values.Boolean)
+}

pkg/stdlib/html/driver/dynamic/events/broker.go

@@ -177,14 +177,20 @@ func (broker *EventBroker) Close() error {
 
 func (broker *EventBroker) emit(name string, message interface{}) {
 	broker.Lock()
-	defer broker.Unlock()
+
 	listeners, ok := broker.listeners[name]
 
 	if !ok {
+		broker.Unlock()
 		return
 	}
 
-	for _, listener := range listeners {
+	// we copy the list of listeners and unlock the broker before the execution.
+	// we do it in order to avoid deadlocks during calls of event listeners
+	snapshot := listeners[:]
+	broker.Unlock()
+
+	for _, listener := range snapshot {
 		listener(message)
 	}
 }

pkg/stdlib/html/driver/dynamic/helpers.go

@@ -50,6 +50,26 @@ func parseAttrs(attrs []string) *values.Object {
 	return res
 }
 
+func loadInnerHtml(client *cdp.Client, id dom.NodeID) (values.String, error) {
+	res, err := client.DOM.GetOuterHTML(context.Background(), dom.NewGetOuterHTMLArgs().SetNodeID(id))
+
+	if err != nil {
+		return "", err
+	}
+
+	return values.NewString(res.OuterHTML), err
+}
+
+func createChildrenArray(nodes []dom.Node) []dom.NodeID {
+	children := make([]dom.NodeID, len(nodes))
+
+	for idx, child := range nodes {
+		children[idx] = child.NodeID
+	}
+
+	return children
+}
+
 func loadNodes(client *cdp.Client, broker *events.EventBroker, nodes []dom.NodeID) (*values.Array, error) {
 	arr := values.NewArray(len(nodes))