gecko-dev/dom/base/nsDOMDataChannel.cpp

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C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsDOMDataChannel.h"
#include "base/basictypes.h"
#include "mozilla/Logging.h"
#include "nsDOMDataChannelDeclarations.h"
#include "nsDOMDataChannel.h"
#include "nsIDOMDataChannel.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MessageEvent.h"
#include "mozilla/dom/MessageEventBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "nsError.h"
#include "nsContentUtils.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsProxyRelease.h"
#include "DataChannel.h"
#include "DataChannelLog.h"
#undef LOG
#define LOG(args) MOZ_LOG(mozilla::gDataChannelLog, mozilla::LogLevel::Debug, args)
// Since we've moved the windows.h include down here, we have to explicitly
// undef GetBinaryType, otherwise we'll get really odd conflicts
#ifdef GetBinaryType
#undef GetBinaryType
#endif
using namespace mozilla;
using namespace mozilla::dom;
nsDOMDataChannel::~nsDOMDataChannel()
{
// Don't call us anymore! Likely isn't an issue (or maybe just less of
// one) once we block GC until all the (appropriate) onXxxx handlers
// are dropped. (See WebRTC spec)
LOG(("%p: Close()ing %p", this, mDataChannel.get()));
mDataChannel->SetListener(nullptr, nullptr);
mDataChannel->Close();
}
/* virtual */ JSObject*
nsDOMDataChannel::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return DataChannelBinding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMDataChannel)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsDOMDataChannel,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(nsDOMDataChannel,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ADDREF_INHERITED(nsDOMDataChannel, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(nsDOMDataChannel, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMDataChannel)
NS_INTERFACE_MAP_ENTRY(nsIDOMDataChannel)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
nsDOMDataChannel::nsDOMDataChannel(already_AddRefed<mozilla::DataChannel>& aDataChannel,
nsPIDOMWindowInner* aWindow)
: DOMEventTargetHelper(aWindow)
, mDataChannel(aDataChannel)
, mBinaryType(DC_BINARY_TYPE_BLOB)
, mCheckMustKeepAlive(true)
, mSentClose(false)
{
}
nsresult
nsDOMDataChannel::Init(nsPIDOMWindowInner* aDOMWindow)
{
nsresult rv;
nsAutoString urlParam;
MOZ_ASSERT(mDataChannel);
mDataChannel->SetListener(this, nullptr);
// Now grovel through the objects to get a usable origin for onMessage
nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(aDOMWindow);
NS_ENSURE_STATE(sgo);
nsCOMPtr<nsIScriptContext> scriptContext = sgo->GetContext();
NS_ENSURE_STATE(scriptContext);
nsCOMPtr<nsIScriptObjectPrincipal> scriptPrincipal(do_QueryInterface(aDOMWindow));
NS_ENSURE_STATE(scriptPrincipal);
nsCOMPtr<nsIPrincipal> principal = scriptPrincipal->GetPrincipal();
NS_ENSURE_STATE(principal);
// Attempt to kill "ghost" DataChannel (if one can happen): but usually too early for check to fail
rv = CheckInnerWindowCorrectness();
NS_ENSURE_SUCCESS(rv,rv);
rv = nsContentUtils::GetUTFOrigin(principal,mOrigin);
LOG(("%s: origin = %s\n",__FUNCTION__,NS_LossyConvertUTF16toASCII(mOrigin).get()));
return rv;
}
// Most of the GetFoo()/SetFoo()s don't need to touch shared resources and
// are safe after Close()
NS_IMETHODIMP
nsDOMDataChannel::GetLabel(nsAString& aLabel)
{
mDataChannel->GetLabel(aLabel);
return NS_OK;
}
NS_IMETHODIMP
nsDOMDataChannel::GetProtocol(nsAString& aProtocol)
{
mDataChannel->GetProtocol(aProtocol);
return NS_OK;
}
uint16_t
nsDOMDataChannel::Id() const
{
return mDataChannel->GetStream();
}
NS_IMETHODIMP
nsDOMDataChannel::GetId(uint16_t *aId)
{
*aId = Id();
return NS_OK;
}
// XXX should be GetType()? Open question for the spec
bool
nsDOMDataChannel::Reliable() const
{
return mDataChannel->GetType() == mozilla::DataChannelConnection::RELIABLE;
}
NS_IMETHODIMP
nsDOMDataChannel::GetReliable(bool* aReliable)
{
*aReliable = Reliable();
return NS_OK;
}
bool
nsDOMDataChannel::Ordered() const
{
return mDataChannel->GetOrdered();
}
NS_IMETHODIMP
nsDOMDataChannel::GetOrdered(bool* aOrdered)
{
*aOrdered = Ordered();
return NS_OK;
}
RTCDataChannelState
nsDOMDataChannel::ReadyState() const
{
return static_cast<RTCDataChannelState>(mDataChannel->GetReadyState());
}
NS_IMETHODIMP
nsDOMDataChannel::GetReadyState(nsAString& aReadyState)
{
// mState is handled on multiple threads and needs locking
uint16_t readyState = mozilla::DataChannel::CLOSED;
if (!mSentClose) {
readyState = mDataChannel->GetReadyState();
}
// From the WebRTC spec
const char * stateName[] = {
"connecting",
"open",
"closing",
"closed"
};
MOZ_ASSERT(/*readyState >= mozilla::DataChannel::CONNECTING && */ // Always true due to datatypes
readyState <= mozilla::DataChannel::CLOSED);
aReadyState.AssignASCII(stateName[readyState]);
return NS_OK;
}
uint32_t
nsDOMDataChannel::BufferedAmount() const
{
if (!mSentClose) {
return mDataChannel->GetBufferedAmount();
}
return 0;
}
uint32_t
nsDOMDataChannel::BufferedAmountLowThreshold() const
{
return mDataChannel->GetBufferedAmountLowThreshold();
}
NS_IMETHODIMP
nsDOMDataChannel::GetBufferedAmount(uint32_t* aBufferedAmount)
{
*aBufferedAmount = BufferedAmount();
return NS_OK;
}
void
nsDOMDataChannel::SetBufferedAmountLowThreshold(uint32_t aThreshold)
{
mDataChannel->SetBufferedAmountLowThreshold(aThreshold);
}
NS_IMETHODIMP nsDOMDataChannel::GetBinaryType(nsAString & aBinaryType)
{
switch (mBinaryType) {
case DC_BINARY_TYPE_ARRAYBUFFER:
aBinaryType.AssignLiteral("arraybuffer");
break;
case DC_BINARY_TYPE_BLOB:
aBinaryType.AssignLiteral("blob");
break;
default:
NS_ERROR("Should not happen");
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMDataChannel::SetBinaryType(const nsAString& aBinaryType)
{
if (aBinaryType.EqualsLiteral("arraybuffer")) {
mBinaryType = DC_BINARY_TYPE_ARRAYBUFFER;
} else if (aBinaryType.EqualsLiteral("blob")) {
mBinaryType = DC_BINARY_TYPE_BLOB;
} else {
return NS_ERROR_INVALID_ARG;
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMDataChannel::Close()
{
mDataChannel->Close();
UpdateMustKeepAlive();
return NS_OK;
}
// All of the following is copy/pasted from WebSocket.cpp.
void
nsDOMDataChannel::Send(const nsAString& aData, ErrorResult& aRv)
{
NS_ConvertUTF16toUTF8 msgString(aData);
Send(nullptr, msgString, false, aRv);
}
void
nsDOMDataChannel::Send(Blob& aData, ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread(), "Not running on main thread");
nsCOMPtr<nsIInputStream> msgStream;
aData.CreateInputStream(getter_AddRefs(msgStream), aRv);
if (NS_WARN_IF(aRv.Failed())){
return;
}
uint64_t msgLength = aData.GetSize(aRv);
if (NS_WARN_IF(aRv.Failed())){
return;
}
if (msgLength > UINT32_MAX) {
aRv.Throw(NS_ERROR_FILE_TOO_BIG);
return;
}
Send(msgStream, EmptyCString(), true, aRv);
}
void
nsDOMDataChannel::Send(const ArrayBuffer& aData, ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread(), "Not running on main thread");
aData.ComputeLengthAndData();
static_assert(sizeof(*aData.Data()) == 1, "byte-sized data required");
uint32_t len = aData.Length();
char* data = reinterpret_cast<char*>(aData.Data());
nsDependentCSubstring msgString(data, len);
Send(nullptr, msgString, true, aRv);
}
void
nsDOMDataChannel::Send(const ArrayBufferView& aData, ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread(), "Not running on main thread");
aData.ComputeLengthAndData();
static_assert(sizeof(*aData.Data()) == 1, "byte-sized data required");
uint32_t len = aData.Length();
char* data = reinterpret_cast<char*>(aData.Data());
nsDependentCSubstring msgString(data, len);
Send(nullptr, msgString, true, aRv);
}
void
nsDOMDataChannel::Send(nsIInputStream* aMsgStream,
const nsACString& aMsgString,
bool aIsBinary,
ErrorResult& aRv)
{
MOZ_ASSERT(NS_IsMainThread());
uint16_t state = mozilla::DataChannel::CLOSED;
if (!mSentClose) {
state = mDataChannel->GetReadyState();
}
// In reality, the DataChannel protocol allows this, but we want it to
// look like WebSockets
if (state == mozilla::DataChannel::CONNECTING) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
if (state == mozilla::DataChannel::CLOSING ||
state == mozilla::DataChannel::CLOSED) {
return;
}
MOZ_ASSERT(state == mozilla::DataChannel::OPEN,
"Unknown state in nsDOMDataChannel::Send");
if (aMsgStream) {
mDataChannel->SendBinaryStream(aMsgStream, aRv);
} else {
if (aIsBinary) {
mDataChannel->SendBinaryMsg(aMsgString, aRv);
} else {
mDataChannel->SendMsg(aMsgString, aRv);
}
}
}
nsresult
nsDOMDataChannel::DoOnMessageAvailable(const nsACString& aData,
bool aBinary)
{
MOZ_ASSERT(NS_IsMainThread());
LOG(("DoOnMessageAvailable%s\n",aBinary ? ((mBinaryType == DC_BINARY_TYPE_BLOB) ? " (blob)" : " (binary)") : ""));
nsresult rv = CheckInnerWindowCorrectness();
if (NS_FAILED(rv)) {
return NS_OK;
}
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(GetOwner()))) {
return NS_ERROR_FAILURE;
}
JSContext* cx = jsapi.cx();
JS::Rooted<JS::Value> jsData(cx);
if (aBinary) {
if (mBinaryType == DC_BINARY_TYPE_BLOB) {
RefPtr<Blob> blob =
Blob::CreateStringBlob(GetOwner(), aData, EmptyString());
MOZ_ASSERT(blob);
if (!ToJSValue(cx, blob, &jsData)) {
return NS_ERROR_FAILURE;
}
} else if (mBinaryType == DC_BINARY_TYPE_ARRAYBUFFER) {
JS::Rooted<JSObject*> arrayBuf(cx);
rv = nsContentUtils::CreateArrayBuffer(cx, aData, arrayBuf.address());
NS_ENSURE_SUCCESS(rv, rv);
jsData.setObject(*arrayBuf);
} else {
MOZ_CRASH("Unknown binary type!");
return NS_ERROR_UNEXPECTED;
}
} else {
NS_ConvertUTF8toUTF16 utf16data(aData);
JSString* jsString = JS_NewUCStringCopyN(cx, utf16data.get(), utf16data.Length());
NS_ENSURE_TRUE(jsString, NS_ERROR_FAILURE);
jsData.setString(jsString);
}
RefPtr<MessageEvent> event = new MessageEvent(this, nullptr, nullptr);
event->InitMessageEvent(nullptr, NS_LITERAL_STRING("message"), false, false,
jsData, mOrigin, EmptyString(), nullptr,
Sequence<OwningNonNull<MessagePort>>());
event->SetTrusted(true);
LOG(("%p(%p): %s - Dispatching\n",this,(void*)mDataChannel,__FUNCTION__));
bool dummy;
rv = DispatchEvent(static_cast<Event*>(event), &dummy);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch the message event!!!");
}
return rv;
}
nsresult
nsDOMDataChannel::OnMessageAvailable(nsISupports* aContext,
const nsACString& aMessage)
{
MOZ_ASSERT(NS_IsMainThread());
return DoOnMessageAvailable(aMessage, false);
}
nsresult
nsDOMDataChannel::OnBinaryMessageAvailable(nsISupports* aContext,
const nsACString& aMessage)
{
MOZ_ASSERT(NS_IsMainThread());
return DoOnMessageAvailable(aMessage, true);
}
nsresult
nsDOMDataChannel::OnSimpleEvent(nsISupports* aContext, const nsAString& aName)
{
MOZ_ASSERT(NS_IsMainThread());
nsresult rv = CheckInnerWindowCorrectness();
if (NS_FAILED(rv)) {
return NS_OK;
}
RefPtr<Event> event = NS_NewDOMEvent(this, nullptr, nullptr);
event->InitEvent(aName, false, false);
event->SetTrusted(true);
bool dummy;
return DispatchEvent(event, &dummy);
}
nsresult
nsDOMDataChannel::OnChannelConnected(nsISupports* aContext)
{
LOG(("%p(%p): %s - Dispatching\n",this,(void*)mDataChannel,__FUNCTION__));
return OnSimpleEvent(aContext, NS_LITERAL_STRING("open"));
}
nsresult
nsDOMDataChannel::OnChannelClosed(nsISupports* aContext)
{
nsresult rv;
// so we don't have to worry if we're notified from different paths in
// the underlying code
if (!mSentClose) {
// Ok, we're done with it.
mDataChannel->ReleaseConnection();
LOG(("%p(%p): %s - Dispatching\n",this,(void*)mDataChannel,__FUNCTION__));
rv = OnSimpleEvent(aContext, NS_LITERAL_STRING("close"));
// no more events can happen
mSentClose = true;
} else {
rv = NS_OK;
}
DontKeepAliveAnyMore();
return rv;
}
nsresult
nsDOMDataChannel::OnBufferLow(nsISupports* aContext)
{
LOG(("%p(%p): %s - Dispatching\n",this,(void*)mDataChannel,__FUNCTION__));
return OnSimpleEvent(aContext, NS_LITERAL_STRING("bufferedamountlow"));
}
nsresult
nsDOMDataChannel::NotBuffered(nsISupports* aContext)
{
// In the rare case that we held off GC to let the buffer drain
UpdateMustKeepAlive();
return NS_OK;
}
void
nsDOMDataChannel::AppReady()
{
if (!mSentClose) { // may not be possible, simpler to just test anyways
mDataChannel->AppReady();
}
}
//-----------------------------------------------------------------------------
// Methods that keep alive the DataChannel object when:
// 1. the object has registered event listeners that can be triggered
// ("strong event listeners");
// 2. there are outgoing not sent messages.
//-----------------------------------------------------------------------------
void
nsDOMDataChannel::UpdateMustKeepAlive()
{
MOZ_ASSERT(NS_IsMainThread());
if (!mCheckMustKeepAlive) {
return;
}
bool shouldKeepAlive = false;
uint16_t readyState = mDataChannel->GetReadyState();
switch (readyState)
{
case DataChannel::CONNECTING:
case DataChannel::WAITING_TO_OPEN:
{
if (mListenerManager &&
(mListenerManager->HasListenersFor(nsGkAtoms::onopen) ||
mListenerManager->HasListenersFor(nsGkAtoms::onmessage) ||
mListenerManager->HasListenersFor(nsGkAtoms::onerror) ||
mListenerManager->HasListenersFor(nsGkAtoms::onbufferedamountlow) ||
mListenerManager->HasListenersFor(nsGkAtoms::onclose))) {
shouldKeepAlive = true;
}
}
break;
case DataChannel::OPEN:
case DataChannel::CLOSING:
{
if (mDataChannel->GetBufferedAmount() != 0 ||
(mListenerManager &&
(mListenerManager->HasListenersFor(nsGkAtoms::onmessage) ||
mListenerManager->HasListenersFor(nsGkAtoms::onerror) ||
mListenerManager->HasListenersFor(nsGkAtoms::onbufferedamountlow) ||
mListenerManager->HasListenersFor(nsGkAtoms::onclose)))) {
shouldKeepAlive = true;
}
}
break;
case DataChannel::CLOSED:
{
shouldKeepAlive = false;
}
}
if (mSelfRef && !shouldKeepAlive) {
ReleaseSelf();
} else if (!mSelfRef && shouldKeepAlive) {
mSelfRef = this;
}
}
void
nsDOMDataChannel::DontKeepAliveAnyMore()
{
MOZ_ASSERT(NS_IsMainThread());
if (mSelfRef) {
// Since we're on MainThread, force an eventloop trip to avoid deleting
// ourselves.
ReleaseSelf();
}
mCheckMustKeepAlive = false;
}
void
nsDOMDataChannel::ReleaseSelf()
{
// release our self-reference (safely) by putting it in an event (always)
NS_ReleaseOnMainThreadSystemGroup("nsDOMDataChannel::mSelfRef",
mSelfRef.forget(), true);
}
void
nsDOMDataChannel::EventListenerAdded(nsAtom* aType)
{
MOZ_ASSERT(NS_IsMainThread());
UpdateMustKeepAlive();
}
void
nsDOMDataChannel::EventListenerRemoved(nsAtom* aType)
{
MOZ_ASSERT(NS_IsMainThread());
UpdateMustKeepAlive();
}
/* static */
nsresult
NS_NewDOMDataChannel(already_AddRefed<mozilla::DataChannel>&& aDataChannel,
nsPIDOMWindowInner* aWindow,
nsIDOMDataChannel** aDomDataChannel)
{
RefPtr<nsDOMDataChannel> domdc =
new nsDOMDataChannel(aDataChannel, aWindow);
nsresult rv = domdc->Init(aWindow);
NS_ENSURE_SUCCESS(rv,rv);
return CallQueryInterface(domdc, aDomDataChannel);
}
/* static */
void
NS_DataChannelAppReady(nsIDOMDataChannel* aDomDataChannel)
{
((nsDOMDataChannel *)aDomDataChannel)->AppReady();
}