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gecko-dev/dom/base/EventSource.cpp

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/* -*- 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 "mozilla/ArrayUtils.h"
#include "mozilla/Components.h"
#include "mozilla/DataMutex.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/GlobalFreezeObserver.h"
#include "mozilla/dom/EventSource.h"
#include "mozilla/dom/EventSourceBinding.h"
#include "mozilla/dom/MessageEvent.h"
#include "mozilla/dom/MessageEventBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/dom/EventSourceEventService.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Try.h"
#include "mozilla/UniquePtrExtensions.h"
#include "nsComponentManagerUtils.h"
#include "nsIThreadRetargetableStreamListener.h"
#include "nsNetUtil.h"
#include "nsIAuthPrompt.h"
#include "nsIAuthPrompt2.h"
#include "nsIHttpChannel.h"
#include "nsIInputStream.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsMimeTypes.h"
#include "nsIPromptFactory.h"
#include "nsIWindowWatcher.h"
#include "nsPresContext.h"
#include "nsProxyRelease.h"
#include "nsContentPolicyUtils.h"
#include "nsIStringBundle.h"
#include "nsIConsoleService.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsJSUtils.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIScriptError.h"
#include "nsContentUtils.h"
#include "xpcpublic.h"
#include "nsWrapperCacheInlines.h"
#include "mozilla/Attributes.h"
#include "mozilla/StaticPrefs_dom.h"
#include "nsError.h"
#include "mozilla/Encoding.h"
#include "ReferrerInfo.h"
namespace mozilla::dom {
#ifdef DEBUG
static LazyLogModule gEventSourceLog("EventSource");
#endif
#define SPACE_CHAR (char16_t)0x0020
#define CR_CHAR (char16_t)0x000D
#define LF_CHAR (char16_t)0x000A
#define COLON_CHAR (char16_t)0x003A
// Reconnection time related values in milliseconds. The default one is equal
// to the default value of the pref dom.serverEvents.defaultReconnectionTime
#define MIN_RECONNECTION_TIME_VALUE 500
#define DEFAULT_RECONNECTION_TIME_VALUE 5000
#define MAX_RECONNECTION_TIME_VALUE \
PR_IntervalToMilliseconds(DELAY_INTERVAL_LIMIT)
class EventSourceImpl final : public nsIChannelEventSink,
public nsIInterfaceRequestor,
public nsISerialEventTarget,
public nsITimerCallback,
public nsINamed,
public nsIThreadRetargetableStreamListener,
public GlobalTeardownObserver,
public GlobalFreezeObserver {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSISTREAMLISTENER
NS_DECL_NSICHANNELEVENTSINK
NS_DECL_NSIINTERFACEREQUESTOR
NS_DECL_NSIEVENTTARGET_FULL
NS_DECL_NSITIMERCALLBACK
NS_DECL_NSINAMED
NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
EventSourceImpl(EventSource* aEventSource,
nsICookieJarSettings* aCookieJarSettings);
enum { CONNECTING = 0U, OPEN = 1U, CLOSED = 2U };
void Close();
void Init(nsIGlobalObject* aWindowGlobal, nsIPrincipal* aPrincipal,
const nsAString& aURL, ErrorResult& aRv);
nsresult GetBaseURI(nsIURI** aBaseURI);
void SetupHttpChannel();
nsresult SetupReferrerInfo(const nsCOMPtr<Document>& aDocument);
nsresult InitChannelAndRequestEventSource(bool aEventTargetAccessAllowed);
nsresult ResetConnection();
void ResetDecoder();
nsresult SetReconnectionTimeout();
void AnnounceConnection();
void DispatchAllMessageEvents();
nsresult RestartConnection();
void ReestablishConnection();
void DispatchFailConnection();
void FailConnection();
void DisconnectFromOwner() override {
Close();
GlobalTeardownObserver::DisconnectFromOwner();
}
void FrozenCallback(nsIGlobalObject* aOwner) override {
DebugOnly<nsresult> rv = Freeze();
MOZ_ASSERT(NS_SUCCEEDED(rv), "Freeze() failed");
}
void ThawedCallback(nsIGlobalObject* aOwner) override {
DebugOnly<nsresult> rv = Thaw();
MOZ_ASSERT(NS_SUCCEEDED(rv), "Thaw() failed");
}
nsresult Thaw();
nsresult Freeze();
nsresult PrintErrorOnConsole(const char* aBundleURI, const char* aError,
const nsTArray<nsString>& aFormatStrings);
nsresult ConsoleError();
static nsresult StreamReaderFunc(nsIInputStream* aInputStream, void* aClosure,
const char* aFromRawSegment,
uint32_t aToOffset, uint32_t aCount,
uint32_t* aWriteCount);
void ParseSegment(const char* aBuffer, uint32_t aLength);
nsresult SetFieldAndClear();
void ClearFields();
nsresult ResetEvent();
nsresult DispatchCurrentMessageEvent();
nsresult ParseCharacter(char16_t aChr);
nsresult CheckHealthOfRequestCallback(nsIRequest* aRequestCallback);
nsresult OnRedirectVerifyCallback(nsresult result);
nsresult ParseURL(const nsAString& aURL);
nsresult AddGlobalObservers(nsIGlobalObject* aGlobal);
void RemoveWindowObservers();
void CloseInternal();
void CleanupOnMainThread();
bool CreateWorkerRef(WorkerPrivate* aWorkerPrivate);
void ReleaseWorkerRef();
void AssertIsOnTargetThread() const {
MOZ_DIAGNOSTIC_ASSERT(IsTargetThread());
}
bool IsTargetThread() const { return NS_GetCurrentThread() == mTargetThread; }
uint16_t ReadyState() {
auto lock = mSharedData.Lock();
if (lock->mEventSource) {
return lock->mEventSource->mReadyState;
}
// EventSourceImpl keeps EventSource alive. If mEventSource is null, it
// means that the EventSource has been closed.
return CLOSED;
}
void SetReadyState(uint16_t aReadyState) {
auto lock = mSharedData.Lock();
MOZ_ASSERT(lock->mEventSource);
MOZ_ASSERT(!mIsShutDown);
lock->mEventSource->mReadyState = aReadyState;
}
bool IsClosed() { return ReadyState() == CLOSED; }
RefPtr<EventSource> GetEventSource() {
AssertIsOnTargetThread();
auto lock = mSharedData.Lock();
return lock->mEventSource;
}
/**
* A simple state machine used to manage the event-source's line buffer
*
* PARSE_STATE_OFF -> PARSE_STATE_BEGIN_OF_STREAM
*
* PARSE_STATE_BEGIN_OF_STREAM -> PARSE_STATE_CR_CHAR |
* PARSE_STATE_BEGIN_OF_LINE |
* PARSE_STATE_COMMENT |
* PARSE_STATE_FIELD_NAME
*
* PARSE_STATE_CR_CHAR -> PARSE_STATE_CR_CHAR |
* PARSE_STATE_COMMENT |
* PARSE_STATE_FIELD_NAME |
* PARSE_STATE_BEGIN_OF_LINE
*
* PARSE_STATE_COMMENT -> PARSE_STATE_CR_CHAR |
* PARSE_STATE_BEGIN_OF_LINE
*
* PARSE_STATE_FIELD_NAME -> PARSE_STATE_CR_CHAR |
* PARSE_STATE_BEGIN_OF_LINE |
* PARSE_STATE_FIRST_CHAR_OF_FIELD_VALUE
*
* PARSE_STATE_FIRST_CHAR_OF_FIELD_VALUE -> PARSE_STATE_FIELD_VALUE |
* PARSE_STATE_CR_CHAR |
* PARSE_STATE_BEGIN_OF_LINE
*
* PARSE_STATE_FIELD_VALUE -> PARSE_STATE_CR_CHAR |
* PARSE_STATE_BEGIN_OF_LINE
*
* PARSE_STATE_BEGIN_OF_LINE -> PARSE_STATE_CR_CHAR |
* PARSE_STATE_COMMENT |
* PARSE_STATE_FIELD_NAME |
* PARSE_STATE_BEGIN_OF_LINE
*
* Whenever the parser find an empty line or the end-of-file
* it dispatches the stacked event.
*
*/
enum ParserStatus {
PARSE_STATE_OFF = 0,
PARSE_STATE_BEGIN_OF_STREAM,
PARSE_STATE_CR_CHAR,
PARSE_STATE_COMMENT,
PARSE_STATE_FIELD_NAME,
PARSE_STATE_FIRST_CHAR_OF_FIELD_VALUE,
PARSE_STATE_FIELD_VALUE,
PARSE_STATE_IGNORE_FIELD_VALUE,
PARSE_STATE_BEGIN_OF_LINE
};
// Connection related data members. Should only be accessed on main thread.
nsCOMPtr<nsIURI> mSrc;
uint32_t mReconnectionTime; // in ms
nsCOMPtr<nsIPrincipal> mPrincipal;
nsString mOrigin;
nsCOMPtr<nsITimer> mTimer;
nsCOMPtr<nsIHttpChannel> mHttpChannel;
struct Message {
nsString mEventName;
// We need to be able to distinguish between different states of id field:
// 1) is not given at all
// 2) is given but is empty
// 3) is given and has a value
// We can't check for the 1st state with a simple nsString.
Maybe<nsString> mLastEventID;
nsString mData;
};
// Message related data members. May be set / initialized when initializing
// EventSourceImpl on target thread but should only be used on target thread.
nsString mLastEventID;
UniquePtr<Message> mCurrentMessage;
nsDeque<Message> mMessagesToDispatch;
ParserStatus mStatus;
mozilla::UniquePtr<mozilla::Decoder> mUnicodeDecoder;
nsString mLastFieldName;
nsString mLastFieldValue;
// EventSourceImpl internal states.
// WorkerRef to keep the worker alive. (accessed on worker thread only)
RefPtr<ThreadSafeWorkerRef> mWorkerRef;
// Whether the window is frozen. May be set on main thread and read on target
// thread.
Atomic<bool> mFrozen;
// There are some messages are going to be dispatched when thaw.
bool mGoingToDispatchAllMessages;
// Whether the EventSource is run on main thread.
const bool mIsMainThread;
// Whether the EventSourceImpl is going to be destroyed.
Atomic<bool> mIsShutDown;
class EventSourceServiceNotifier final {
public:
EventSourceServiceNotifier(RefPtr<EventSourceImpl>&& aEventSourceImpl,
uint64_t aHttpChannelId, uint64_t aInnerWindowID)
: mEventSourceImpl(std::move(aEventSourceImpl)),
mHttpChannelId(aHttpChannelId),
mInnerWindowID(aInnerWindowID),
mConnectionOpened(false) {
AssertIsOnMainThread();
mService = EventSourceEventService::GetOrCreate();
}
void ConnectionOpened() {
mEventSourceImpl->AssertIsOnTargetThread();
mService->EventSourceConnectionOpened(mHttpChannelId, mInnerWindowID);
mConnectionOpened = true;
}
void EventReceived(const nsAString& aEventName,
const nsAString& aLastEventID, const nsAString& aData,
uint32_t aRetry, DOMHighResTimeStamp aTimeStamp) {
mEventSourceImpl->AssertIsOnTargetThread();
mService->EventReceived(mHttpChannelId, mInnerWindowID, aEventName,
aLastEventID, aData, aRetry, aTimeStamp);
}
~EventSourceServiceNotifier() {
// It is safe to call this on any thread because
// EventSourceConnectionClosed method is thread safe and
// NS_ReleaseOnMainThread explicitly releases the service on the main
// thread.
if (mConnectionOpened) {
// We want to notify about connection being closed only if we told
// it was ever opened. The check is needed if OnStartRequest is called
// on the main thread while close() is called on a worker thread.
mService->EventSourceConnectionClosed(mHttpChannelId, mInnerWindowID);
}
NS_ReleaseOnMainThread("EventSourceServiceNotifier::mService",
mService.forget());
}
private:
RefPtr<EventSourceEventService> mService;
RefPtr<EventSourceImpl> mEventSourceImpl;
uint64_t mHttpChannelId;
uint64_t mInnerWindowID;
bool mConnectionOpened;
};
struct SharedData {
RefPtr<EventSource> mEventSource;
UniquePtr<EventSourceServiceNotifier> mServiceNotifier;
};
DataMutex<SharedData> mSharedData;
// Event Source owner information:
// - the script file name
// - source code line number and column number where the Event Source object
// was constructed.
// - the ID of the inner window where the script lives. Note that this may not
// be the same as the Event Source owner window.
// These attributes are used for error reporting. Should only be accessed on
// target thread
JSCallingLocation mCallingLocation;
uint64_t mInnerWindowID;
private:
nsCOMPtr<nsICookieJarSettings> mCookieJarSettings;
// Pointer to the target thread for checking whether we are
// on the target thread. This is intentionally a non-owning
// pointer in order not to affect the thread destruction
// sequence. This pointer must only be compared for equality
// and must not be dereferenced.
nsIThread* mTargetThread;
// prevent bad usage
EventSourceImpl(const EventSourceImpl& x) = delete;
EventSourceImpl& operator=(const EventSourceImpl& x) = delete;
~EventSourceImpl() {
if (IsClosed()) {
return;
}
// If we threw during Init we never called Close
SetReadyState(CLOSED);
CloseInternal();
}
};
NS_IMPL_ISUPPORTS(EventSourceImpl, nsIStreamListener, nsIRequestObserver,
nsIChannelEventSink, nsIInterfaceRequestor,
nsISerialEventTarget, nsIEventTarget,
nsIThreadRetargetableStreamListener, nsITimerCallback,
nsINamed)
EventSourceImpl::EventSourceImpl(EventSource* aEventSource,
nsICookieJarSettings* aCookieJarSettings)
: mReconnectionTime(0),
mStatus(PARSE_STATE_OFF),
mFrozen(false),
mGoingToDispatchAllMessages(false),
mIsMainThread(NS_IsMainThread()),
mIsShutDown(false),
mSharedData(SharedData{aEventSource}, "EventSourceImpl::mSharedData"),
mInnerWindowID(0),
mCookieJarSettings(aCookieJarSettings),
mTargetThread(NS_GetCurrentThread()) {
MOZ_ASSERT(aEventSource);
SetReadyState(CONNECTING);
}
class CleanupRunnable final : public WorkerMainThreadRunnable {
public:
explicit CleanupRunnable(RefPtr<EventSourceImpl>&& aEventSourceImpl)
: WorkerMainThreadRunnable(GetCurrentThreadWorkerPrivate(),
"EventSource :: Cleanup"_ns),
mESImpl(std::move(aEventSourceImpl)) {
MOZ_ASSERT(mESImpl);
}
bool MainThreadRun() override {
MOZ_ASSERT(mESImpl);
mESImpl->CleanupOnMainThread();
// We want to ensure the shortest possible remaining lifetime
// and not depend on the Runnable's destruction.
mESImpl = nullptr;
return true;
}
protected:
RefPtr<EventSourceImpl> mESImpl;
};
void EventSourceImpl::Close() {
if (IsClosed()) {
return;
}
SetReadyState(CLOSED);
// CloseInternal potentially kills ourself, ensure
// to not access any members afterwards.
CloseInternal();
}
void EventSourceImpl::CloseInternal() {
AssertIsOnTargetThread();
MOZ_ASSERT(IsClosed());
RefPtr<EventSource> myES;
{
auto lock = mSharedData.Lock();
// We want to ensure to release ourself even if we have
// the shutdown case, thus we put aside a pointer
// to the EventSource and null it out right now.
myES = std::move(lock->mEventSource);
lock->mEventSource = nullptr;
lock->mServiceNotifier = nullptr;
}
MOZ_ASSERT(!mIsShutDown);
if (mIsShutDown) {
return;
}
// Invoke CleanupOnMainThread before cleaning any members. It will call
// ShutDown, which is supposed to be called before cleaning any members.
if (NS_IsMainThread()) {
CleanupOnMainThread();
} else {
ErrorResult rv;
// run CleanupOnMainThread synchronously on main thread since it touches
// observers and members only can be accessed on main thread.
RefPtr<CleanupRunnable> runnable = new CleanupRunnable(this);
runnable->Dispatch(GetCurrentThreadWorkerPrivate(), Killing, rv);
MOZ_ASSERT(!rv.Failed());
ReleaseWorkerRef();
}
while (mMessagesToDispatch.GetSize() != 0) {
delete mMessagesToDispatch.PopFront();
}
mFrozen = false;
ResetDecoder();
mUnicodeDecoder = nullptr;
// Release the object on its owner. Don't access to any members
// after it.
myES->mESImpl = nullptr;
}
void EventSourceImpl::CleanupOnMainThread() {
AssertIsOnMainThread();
MOZ_ASSERT(IsClosed());
// Call ShutDown before cleaning any members.
MOZ_ASSERT(!mIsShutDown);
mIsShutDown = true;
if (mIsMainThread) {
RemoveWindowObservers();
}
if (mTimer) {
mTimer->Cancel();
mTimer = nullptr;
}
ResetConnection();
mPrincipal = nullptr;
mSrc = nullptr;
}
class ConnectRunnable final : public WorkerMainThreadRunnable {
public:
explicit ConnectRunnable(WorkerPrivate* aWorkerPrivate,
RefPtr<EventSourceImpl> aEventSourceImpl)
: WorkerMainThreadRunnable(aWorkerPrivate, "EventSource :: Connect"_ns),
mESImpl(std::move(aEventSourceImpl)) {
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
MOZ_ASSERT(mESImpl);
}
bool MainThreadRun() override {
MOZ_ASSERT(mESImpl);
// We are allowed to access the event target since this runnable is
// synchronized with the thread the event target lives on.
mESImpl->InitChannelAndRequestEventSource(true);
// We want to ensure the shortest possible remaining lifetime
// and not depend on the Runnable's destruction.
mESImpl = nullptr;
return true;
}
private:
RefPtr<EventSourceImpl> mESImpl;
};
nsresult EventSourceImpl::ParseURL(const nsAString& aURL) {
MOZ_ASSERT(!mIsShutDown);
// get the src
nsCOMPtr<nsIURI> baseURI;
nsresult rv = GetBaseURI(getter_AddRefs(baseURI));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> srcURI;
nsCOMPtr<Document> doc =
mIsMainThread ? GetEventSource()->GetDocumentIfCurrent() : nullptr;
if (doc) {
rv = NS_NewURI(getter_AddRefs(srcURI), aURL, doc->GetDocumentCharacterSet(),
baseURI);
} else {
rv = NS_NewURI(getter_AddRefs(srcURI), aURL, nullptr, baseURI);
}
NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_SYNTAX_ERR);
nsAutoString origin;
rv = nsContentUtils::GetWebExposedOriginSerialization(srcURI, origin);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString spec;
rv = srcURI->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
// This assignment doesn't require extra synchronization because this function
// is only ever called from EventSourceImpl::Init(), which is either called
// directly if mEventSource was created on the main thread, or via a
// synchronous runnable if it was created on a worker thread.
{
// We can't use GetEventSource() here because it would modify the refcount,
// and that's not allowed off the owning thread.
auto lock = mSharedData.Lock();
lock->mEventSource->mOriginalURL = NS_ConvertUTF8toUTF16(spec);
}
mSrc = srcURI;
mOrigin = origin;
return NS_OK;
}
nsresult EventSourceImpl::AddGlobalObservers(nsIGlobalObject* aGlobal) {
AssertIsOnMainThread();
MOZ_ASSERT(mIsMainThread);
MOZ_ASSERT(!mIsShutDown);
GlobalTeardownObserver::BindToOwner(aGlobal);
GlobalFreezeObserver::BindToOwner(aGlobal);
return NS_OK;
}
void EventSourceImpl::RemoveWindowObservers() {
AssertIsOnMainThread();
MOZ_ASSERT(mIsMainThread);
MOZ_ASSERT(IsClosed());
GlobalTeardownObserver::DisconnectFromOwner();
DisconnectFreezeObserver();
}
void EventSourceImpl::Init(nsIGlobalObject* aWindowGlobal,
nsIPrincipal* aPrincipal, const nsAString& aURL,
ErrorResult& aRv) {
// aWindowGlobal should only exist for main-thread EventSource
MOZ_ASSERT_IF(aWindowGlobal, mIsMainThread);
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(ReadyState() == CONNECTING);
mPrincipal = aPrincipal;
aRv = ParseURL(aURL);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
// The conditional here is historical and not necessarily sane.
if (JSContext* cx = nsContentUtils::GetCurrentJSContext()) {
mCallingLocation = JSCallingLocation::Get();
if (mIsMainThread) {
mInnerWindowID = nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(cx);
}
}
if (mIsMainThread) {
// We observe when the window freezes and thaws.
//
// This will store raw pointer of us in GTO, which sounds scary as the
// object can be accessed cross thread. But it should be safe as GTO and
// EventSourceImpl lifetime should be managed in the same main thread.
//
// XXX(krosylight): But what about workers? See bug 1910585.
aRv = AddGlobalObservers(aWindowGlobal);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
}
mReconnectionTime = StaticPrefs::dom_serverEvents_defaultReconnectionTime();
if (!mReconnectionTime) {
mReconnectionTime = DEFAULT_RECONNECTION_TIME_VALUE;
}
mUnicodeDecoder = UTF_8_ENCODING->NewDecoderWithBOMRemoval();
}
//-----------------------------------------------------------------------------
// EventSourceImpl::nsIStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
EventSourceImpl::OnStartRequest(nsIRequest* aRequest) {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
nsresult rv = CheckHealthOfRequestCallback(aRequest);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsresult status;
rv = aRequest->GetStatus(&status);
NS_ENSURE_SUCCESS(rv, rv);
if (NS_FAILED(status)) {
// EventSource::OnStopRequest will evaluate if it shall either reestablish
// or fail the connection, based on the status.
return status;
}
uint32_t httpStatus;
rv = httpChannel->GetResponseStatus(&httpStatus);
NS_ENSURE_SUCCESS(rv, rv);
if (httpStatus != 200) {
DispatchFailConnection();
return NS_ERROR_ABORT;
}
nsAutoCString contentType;
rv = httpChannel->GetContentType(contentType);
NS_ENSURE_SUCCESS(rv, rv);
if (!contentType.EqualsLiteral(TEXT_EVENT_STREAM)) {
DispatchFailConnection();
return NS_ERROR_ABORT;
}
if (!mIsMainThread) {
// Try to retarget to worker thread, otherwise fall back to main thread.
nsCOMPtr<nsIThreadRetargetableRequest> rr = do_QueryInterface(httpChannel);
if (rr) {
rv = rr->RetargetDeliveryTo(this);
if (NS_WARN_IF(NS_FAILED(rv))) {
NS_WARNING("Retargeting failed");
}
}
}
{
auto lock = mSharedData.Lock();
lock->mServiceNotifier = MakeUnique<EventSourceServiceNotifier>(
this, mHttpChannel->ChannelId(), mInnerWindowID);
}
rv = Dispatch(NewRunnableMethod("dom::EventSourceImpl::AnnounceConnection",
this, &EventSourceImpl::AnnounceConnection),
NS_DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_BEGIN_OF_STREAM;
return NS_OK;
}
// this method parses the characters as they become available instead of
// buffering them.
nsresult EventSourceImpl::StreamReaderFunc(nsIInputStream* aInputStream,
void* aClosure,
const char* aFromRawSegment,
uint32_t aToOffset, uint32_t aCount,
uint32_t* aWriteCount) {
// The EventSourceImpl instance is hold alive on the
// synchronously calling stack, so raw pointer is fine here.
EventSourceImpl* thisObject = static_cast<EventSourceImpl*>(aClosure);
if (!thisObject || !aWriteCount) {
NS_WARNING(
"EventSource cannot read from stream: no aClosure or aWriteCount");
return NS_ERROR_FAILURE;
}
thisObject->AssertIsOnTargetThread();
MOZ_ASSERT(!thisObject->mIsShutDown);
thisObject->ParseSegment((const char*)aFromRawSegment, aCount);
*aWriteCount = aCount;
return NS_OK;
}
void EventSourceImpl::ParseSegment(const char* aBuffer, uint32_t aLength) {
AssertIsOnTargetThread();
if (IsClosed()) {
return;
}
char16_t buffer[1024];
auto dst = Span(buffer);
auto src = AsBytes(Span(aBuffer, aLength));
// XXX EOF handling is https://bugzilla.mozilla.org/show_bug.cgi?id=1369018
for (;;) {
uint32_t result;
size_t read;
size_t written;
std::tie(result, read, written, std::ignore) =
mUnicodeDecoder->DecodeToUTF16(src, dst, false);
for (auto c : dst.To(written)) {
nsresult rv = ParseCharacter(c);
NS_ENSURE_SUCCESS_VOID(rv);
}
if (result == kInputEmpty) {
return;
}
src = src.From(read);
}
}
NS_IMETHODIMP
EventSourceImpl::OnDataAvailable(nsIRequest* aRequest,
nsIInputStream* aInputStream, uint64_t aOffset,
uint32_t aCount) {
AssertIsOnTargetThread();
NS_ENSURE_ARG_POINTER(aInputStream);
if (IsClosed()) {
return NS_ERROR_ABORT;
}
nsresult rv = CheckHealthOfRequestCallback(aRequest);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t totalRead;
return aInputStream->ReadSegments(EventSourceImpl::StreamReaderFunc, this,
aCount, &totalRead);
}
NS_IMETHODIMP
EventSourceImpl::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
MOZ_ASSERT(mSrc);
// "Network errors that prevents the connection from being established in the
// first place (e.g. DNS errors), must cause the user agent to asynchronously
// reestablish the connection.
//
// (...) the cancelation of the fetch algorithm by the user agent (e.g. in
// response to window.stop() or the user canceling the network connection
// manually) must cause the user agent to fail the connection.
// There could be additional network errors that are not covered in the above
// checks
// See Bug 1808511
if (NS_FAILED(aStatusCode) && aStatusCode != NS_ERROR_CONNECTION_REFUSED &&
aStatusCode != NS_ERROR_NET_TIMEOUT &&
aStatusCode != NS_ERROR_NET_RESET &&
aStatusCode != NS_ERROR_NET_INTERRUPT &&
aStatusCode != NS_ERROR_NET_PARTIAL_TRANSFER &&
aStatusCode != NS_ERROR_NET_TIMEOUT_EXTERNAL &&
aStatusCode != NS_ERROR_PROXY_CONNECTION_REFUSED &&
aStatusCode != NS_ERROR_DNS_LOOKUP_QUEUE_FULL &&
aStatusCode != NS_ERROR_INVALID_CONTENT_ENCODING) {
DispatchFailConnection();
return NS_ERROR_ABORT;
}
nsresult rv = CheckHealthOfRequestCallback(aRequest);
NS_ENSURE_SUCCESS(rv, rv);
rv =
Dispatch(NewRunnableMethod("dom::EventSourceImpl::ReestablishConnection",
this, &EventSourceImpl::ReestablishConnection),
NS_DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
//-----------------------------------------------------------------------------
// EventSourceImpl::nsIChannelEventSink
//-----------------------------------------------------------------------------
NS_IMETHODIMP
EventSourceImpl::AsyncOnChannelRedirect(
nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aFlags,
nsIAsyncVerifyRedirectCallback* aCallback) {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
nsCOMPtr<nsIRequest> aOldRequest = aOldChannel;
MOZ_ASSERT(aOldRequest, "Redirect from a null request?");
nsresult rv = CheckHealthOfRequestCallback(aOldRequest);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ASSERT(aNewChannel, "Redirect without a channel?");
nsCOMPtr<nsIURI> newURI;
rv = NS_GetFinalChannelURI(aNewChannel, getter_AddRefs(newURI));
NS_ENSURE_SUCCESS(rv, rv);
bool isValidScheme = newURI->SchemeIs("http") || newURI->SchemeIs("https");
rv =
mIsMainThread ? GetEventSource()->CheckCurrentGlobalCorrectness() : NS_OK;
if (NS_FAILED(rv) || !isValidScheme) {
DispatchFailConnection();
return NS_ERROR_DOM_SECURITY_ERR;
}
// update our channel
mHttpChannel = do_QueryInterface(aNewChannel);
NS_ENSURE_STATE(mHttpChannel);
SetupHttpChannel();
// The HTTP impl already copies over the referrer info on
// redirects, so we don't need to SetupReferrerInfo().
if ((aFlags & nsIChannelEventSink::REDIRECT_PERMANENT) != 0) {
rv = NS_GetFinalChannelURI(mHttpChannel, getter_AddRefs(mSrc));
NS_ENSURE_SUCCESS(rv, rv);
}
aCallback->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
//-----------------------------------------------------------------------------
// EventSourceImpl::nsIInterfaceRequestor
//-----------------------------------------------------------------------------
NS_IMETHODIMP
EventSourceImpl::GetInterface(const nsIID& aIID, void** aResult) {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_FAILURE;
}
if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
*aResult = static_cast<nsIChannelEventSink*>(this);
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsIAuthPrompt)) ||
aIID.Equals(NS_GET_IID(nsIAuthPrompt2))) {
nsresult rv;
nsCOMPtr<nsIPromptFactory> wwatch =
do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsPIDOMWindowOuter> window;
// To avoid a data race we may only access the event target if it lives on
// the main thread.
if (mIsMainThread) {
auto lock = mSharedData.Lock();
rv = lock->mEventSource->CheckCurrentGlobalCorrectness();
NS_ENSURE_SUCCESS(rv, NS_ERROR_UNEXPECTED);
if (nsGlobalWindowInner* win = lock->mEventSource->GetOwnerWindow()) {
window = win->GetOuterWindow();
}
}
// Get the an auth prompter for our window so that the parenting
// of the dialogs works as it should when using tabs.
return wwatch->GetPrompt(window, aIID, aResult);
}
return QueryInterface(aIID, aResult);
}
NS_IMETHODIMP
EventSourceImpl::IsOnCurrentThread(bool* aResult) {
*aResult = IsTargetThread();
return NS_OK;
}
NS_IMETHODIMP_(bool)
EventSourceImpl::IsOnCurrentThreadInfallible() { return IsTargetThread(); }
nsresult EventSourceImpl::GetBaseURI(nsIURI** aBaseURI) {
MOZ_ASSERT(!mIsShutDown);
NS_ENSURE_ARG_POINTER(aBaseURI);
*aBaseURI = nullptr;
nsCOMPtr<nsIURI> baseURI;
// first we try from document->GetBaseURI()
nsCOMPtr<Document> doc =
mIsMainThread ? GetEventSource()->GetDocumentIfCurrent() : nullptr;
if (doc) {
baseURI = doc->GetBaseURI();
}
// otherwise we get from the doc's principal
if (!baseURI) {
auto* basePrin = BasePrincipal::Cast(mPrincipal);
nsresult rv = basePrin->GetURI(getter_AddRefs(baseURI));
NS_ENSURE_SUCCESS(rv, rv);
}
NS_ENSURE_STATE(baseURI);
baseURI.forget(aBaseURI);
return NS_OK;
}
void EventSourceImpl::SetupHttpChannel() {
AssertIsOnMainThread();
MOZ_ASSERT(!mIsShutDown);
nsresult rv = mHttpChannel->SetRequestMethod("GET"_ns);
MOZ_ASSERT(NS_SUCCEEDED(rv));
/* set the http request headers */
rv = mHttpChannel->SetRequestHeader(
"Accept"_ns, nsLiteralCString(TEXT_EVENT_STREAM), false);
MOZ_ASSERT(NS_SUCCEEDED(rv));
// LOAD_BYPASS_CACHE already adds the Cache-Control: no-cache header
if (mLastEventID.IsEmpty()) {
return;
}
NS_ConvertUTF16toUTF8 eventId(mLastEventID);
rv = mHttpChannel->SetRequestHeader("Last-Event-ID"_ns, eventId, false);
#ifdef DEBUG
if (NS_FAILED(rv)) {
MOZ_LOG(gEventSourceLog, LogLevel::Warning,
("SetupHttpChannel. rv=%x (%s)", uint32_t(rv), eventId.get()));
}
#endif
Unused << rv;
}
nsresult EventSourceImpl::SetupReferrerInfo(
const nsCOMPtr<Document>& aDocument) {
AssertIsOnMainThread();
MOZ_ASSERT(!mIsShutDown);
if (aDocument) {
auto referrerInfo = MakeRefPtr<ReferrerInfo>(*aDocument);
nsresult rv = mHttpChannel->SetReferrerInfoWithoutClone(referrerInfo);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
nsresult EventSourceImpl::InitChannelAndRequestEventSource(
const bool aEventTargetAccessAllowed) {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
bool isValidScheme = mSrc->SchemeIs("http") || mSrc->SchemeIs("https");
MOZ_ASSERT_IF(mIsMainThread, aEventTargetAccessAllowed);
nsresult rv = aEventTargetAccessAllowed ? [this]() {
// We can't call GetEventSource() because we're not
// allowed to touch the refcount off the worker thread
// due to an assertion, event if it would have otherwise
// been safe.
auto lock = mSharedData.Lock();
return lock->mEventSource->CheckCurrentGlobalCorrectness();
}()
: NS_OK;
if (NS_FAILED(rv) || !isValidScheme) {
DispatchFailConnection();
return NS_ERROR_DOM_SECURITY_ERR;
}
nsCOMPtr<Document> doc;
nsSecurityFlags securityFlags =
nsILoadInfo::SEC_REQUIRE_CORS_INHERITS_SEC_CONTEXT;
{
auto lock = mSharedData.Lock();
doc = aEventTargetAccessAllowed ? lock->mEventSource->GetDocumentIfCurrent()
: nullptr;
if (lock->mEventSource->mWithCredentials) {
securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
}
}
// The html spec requires we use fetch cache mode of "no-store". This
// maps to LOAD_BYPASS_CACHE and LOAD_INHIBIT_CACHING in necko.
nsLoadFlags loadFlags;
loadFlags = nsIRequest::LOAD_BACKGROUND | nsIRequest::LOAD_BYPASS_CACHE |
nsIRequest::INHIBIT_CACHING;
nsCOMPtr<nsIChannel> channel;
// If we have the document, use it
if (doc) {
MOZ_ASSERT(mCookieJarSettings == doc->CookieJarSettings());
nsCOMPtr<nsILoadGroup> loadGroup = doc->GetDocumentLoadGroup();
rv = NS_NewChannel(getter_AddRefs(channel), mSrc, doc, securityFlags,
nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE,
nullptr, // aPerformanceStorage
loadGroup,
nullptr, // aCallbacks
loadFlags); // aLoadFlags
} else {
// otherwise use the principal
rv = NS_NewChannel(getter_AddRefs(channel), mSrc, mPrincipal, securityFlags,
nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE,
mCookieJarSettings,
nullptr, // aPerformanceStorage
nullptr, // loadGroup
nullptr, // aCallbacks
loadFlags); // aLoadFlags
}
NS_ENSURE_SUCCESS(rv, rv);
mHttpChannel = do_QueryInterface(channel);
NS_ENSURE_TRUE(mHttpChannel, NS_ERROR_NO_INTERFACE);
SetupHttpChannel();
rv = SetupReferrerInfo(doc);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef DEBUG
{
nsCOMPtr<nsIInterfaceRequestor> notificationCallbacks;
mHttpChannel->GetNotificationCallbacks(
getter_AddRefs(notificationCallbacks));
MOZ_ASSERT(!notificationCallbacks);
}
#endif
mHttpChannel->SetNotificationCallbacks(this);
// Start reading from the channel
rv = mHttpChannel->AsyncOpen(this);
if (NS_FAILED(rv)) {
DispatchFailConnection();
return rv;
}
return rv;
}
void EventSourceImpl::AnnounceConnection() {
AssertIsOnTargetThread();
if (ReadyState() != CONNECTING) {
NS_WARNING("Unexpected mReadyState!!!");
return;
}
{
auto lock = mSharedData.Lock();
if (lock->mServiceNotifier) {
lock->mServiceNotifier->ConnectionOpened();
}
}
// When a user agent is to announce the connection, the user agent must set
// the readyState attribute to OPEN and queue a task to fire a simple event
// named open at the EventSource object.
SetReadyState(OPEN);
nsresult rv = GetEventSource()->CheckCurrentGlobalCorrectness();
if (NS_FAILED(rv)) {
return;
}
// We can't hold the mutex while dispatching the event because the mutex is
// not reentrant, and content might call back into our code.
rv = GetEventSource()->CreateAndDispatchSimpleEvent(u"open"_ns);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch the error event!!!");
return;
}
}
nsresult EventSourceImpl::ResetConnection() {
AssertIsOnMainThread();
if (mHttpChannel) {
mHttpChannel->Cancel(NS_ERROR_ABORT);
mHttpChannel = nullptr;
}
return NS_OK;
}
void EventSourceImpl::ResetDecoder() {
AssertIsOnTargetThread();
if (mUnicodeDecoder) {
UTF_8_ENCODING->NewDecoderWithBOMRemovalInto(*mUnicodeDecoder);
}
mStatus = PARSE_STATE_OFF;
ClearFields();
}
class CallRestartConnection final : public WorkerMainThreadRunnable {
public:
explicit CallRestartConnection(RefPtr<EventSourceImpl>&& aEventSourceImpl)
: WorkerMainThreadRunnable(aEventSourceImpl->mWorkerRef->Private(),
"EventSource :: RestartConnection"_ns),
mESImpl(std::move(aEventSourceImpl)) {
MOZ_ASSERT(mESImpl);
}
bool MainThreadRun() override {
MOZ_ASSERT(mESImpl);
mESImpl->RestartConnection();
// We want to ensure the shortest possible remaining lifetime
// and not depend on the Runnable's destruction.
mESImpl = nullptr;
return true;
}
protected:
RefPtr<EventSourceImpl> mESImpl;
};
nsresult EventSourceImpl::RestartConnection() {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
nsresult rv = ResetConnection();
NS_ENSURE_SUCCESS(rv, rv);
rv = SetReconnectionTimeout();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
void EventSourceImpl::ReestablishConnection() {
AssertIsOnTargetThread();
if (IsClosed()) {
return;
}
nsresult rv;
if (mIsMainThread) {
rv = RestartConnection();
} else {
RefPtr<CallRestartConnection> runnable = new CallRestartConnection(this);
ErrorResult result;
runnable->Dispatch(GetCurrentThreadWorkerPrivate(), Canceling, result);
MOZ_ASSERT(!result.Failed());
rv = result.StealNSResult();
}
if (NS_FAILED(rv)) {
return;
}
rv = GetEventSource()->CheckCurrentGlobalCorrectness();
if (NS_FAILED(rv)) {
return;
}
SetReadyState(CONNECTING);
ResetDecoder();
// We can't hold the mutex while dispatching the event because the mutex is
// not reentrant, and content might call back into our code.
rv = GetEventSource()->CreateAndDispatchSimpleEvent(u"error"_ns);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch the error event!!!");
return;
}
}
nsresult EventSourceImpl::SetReconnectionTimeout() {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
// the timer will be used whenever the requests are going finished.
if (!mTimer) {
mTimer = NS_NewTimer();
NS_ENSURE_STATE(mTimer);
}
MOZ_TRY(mTimer->InitWithCallback(this, mReconnectionTime,
nsITimer::TYPE_ONE_SHOT));
return NS_OK;
}
nsresult EventSourceImpl::PrintErrorOnConsole(
const char* aBundleURI, const char* aError,
const nsTArray<nsString>& aFormatStrings) {
AssertIsOnMainThread();
MOZ_ASSERT(!mIsShutDown);
nsCOMPtr<nsIStringBundleService> bundleService =
mozilla::components::StringBundle::Service();
NS_ENSURE_STATE(bundleService);
nsCOMPtr<nsIStringBundle> strBundle;
nsresult rv =
bundleService->CreateBundle(aBundleURI, getter_AddRefs(strBundle));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIConsoleService> console(
do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIScriptError> errObj(
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv));
NS_ENSURE_SUCCESS(rv, rv);
// Localize the error message
nsAutoString message;
if (!aFormatStrings.IsEmpty()) {
rv = strBundle->FormatStringFromName(aError, aFormatStrings, message);
} else {
rv = strBundle->GetStringFromName(aError, message);
}
NS_ENSURE_SUCCESS(rv, rv);
rv = errObj->InitWithWindowID(
message, mCallingLocation.FileName(), mCallingLocation.mLine,
mCallingLocation.mColumn, nsIScriptError::errorFlag, "Event Source",
mInnerWindowID);
NS_ENSURE_SUCCESS(rv, rv);
// print the error message directly to the JS console
rv = console->LogMessage(errObj);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult EventSourceImpl::ConsoleError() {
AssertIsOnMainThread();
MOZ_ASSERT(!mIsShutDown);
nsAutoCString targetSpec;
nsresult rv = mSrc->GetSpec(targetSpec);
NS_ENSURE_SUCCESS(rv, rv);
AutoTArray<nsString, 1> formatStrings;
CopyUTF8toUTF16(targetSpec, *formatStrings.AppendElement());
if (ReadyState() == CONNECTING) {
rv = PrintErrorOnConsole("chrome://global/locale/appstrings.properties",
"connectionFailure", formatStrings);
} else {
rv = PrintErrorOnConsole("chrome://global/locale/appstrings.properties",
"netInterrupt", formatStrings);
}
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
void EventSourceImpl::DispatchFailConnection() {
AssertIsOnMainThread();
if (IsClosed()) {
return;
}
nsresult rv = ConsoleError();
if (NS_FAILED(rv)) {
NS_WARNING("Failed to print to the console error");
}
rv = Dispatch(NewRunnableMethod("dom::EventSourceImpl::FailConnection", this,
&EventSourceImpl::FailConnection),
NS_DISPATCH_NORMAL);
if (NS_WARN_IF(NS_FAILED(rv))) {
// if the worker is shutting down, the dispatching of normal WorkerRunnables
// fails.
return;
}
}
void EventSourceImpl::FailConnection() {
AssertIsOnTargetThread();
if (IsClosed()) {
return;
}
// Must change state to closed before firing event to content.
SetReadyState(CLOSED);
// When a user agent is to fail the connection, the user agent must set the
// readyState attribute to CLOSED and queue a task to fire a simple event
// named error at the EventSource object.
nsresult rv = GetEventSource()->CheckCurrentGlobalCorrectness();
if (NS_SUCCEEDED(rv)) {
// We can't hold the mutex while dispatching the event because the mutex
// is not reentrant, and content might call back into our code.
rv = GetEventSource()->CreateAndDispatchSimpleEvent(u"error"_ns);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch the error event!!!");
}
}
// Call CloseInternal in the end of function because it may release
// EventSourceImpl.
CloseInternal();
}
NS_IMETHODIMP EventSourceImpl::Notify(nsITimer* aTimer) {
AssertIsOnMainThread();
if (IsClosed()) {
return NS_OK;
}
MOZ_ASSERT(!mHttpChannel, "the channel hasn't been cancelled!!");
if (!mFrozen) {
nsresult rv = InitChannelAndRequestEventSource(mIsMainThread);
if (NS_FAILED(rv)) {
NS_WARNING("InitChannelAndRequestEventSource() failed");
}
}
return NS_OK;
}
NS_IMETHODIMP EventSourceImpl::GetName(nsACString& aName) {
aName.AssignLiteral("EventSourceImpl");
return NS_OK;
}
nsresult EventSourceImpl::Thaw() {
AssertIsOnMainThread();
if (IsClosed() || !mFrozen) {
return NS_OK;
}
MOZ_ASSERT(!mHttpChannel, "the connection hasn't been closed!!!");
mFrozen = false;
nsresult rv;
if (!mGoingToDispatchAllMessages && mMessagesToDispatch.GetSize() > 0) {
nsCOMPtr<nsIRunnable> event =
NewRunnableMethod("dom::EventSourceImpl::DispatchAllMessageEvents",
this, &EventSourceImpl::DispatchAllMessageEvents);
NS_ENSURE_STATE(event);
mGoingToDispatchAllMessages = true;
rv = Dispatch(event.forget(), NS_DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
}
rv = InitChannelAndRequestEventSource(mIsMainThread);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult EventSourceImpl::Freeze() {
AssertIsOnMainThread();
if (IsClosed() || mFrozen) {
return NS_OK;
}
MOZ_ASSERT(!mHttpChannel, "the connection hasn't been closed!!!");
mFrozen = true;
return NS_OK;
}
nsresult EventSourceImpl::DispatchCurrentMessageEvent() {
AssertIsOnTargetThread();
MOZ_ASSERT(!mIsShutDown);
UniquePtr<Message> message(std::move(mCurrentMessage));
ClearFields();
if (!message || message->mData.IsEmpty()) {
return NS_OK;
}
// removes the trailing LF from mData
MOZ_ASSERT(message->mData.CharAt(message->mData.Length() - 1) == LF_CHAR,
"Invalid trailing character! LF was expected instead.");
message->mData.SetLength(message->mData.Length() - 1);
if (message->mEventName.IsEmpty()) {
message->mEventName.AssignLiteral("message");
}
mMessagesToDispatch.Push(message.release());
if (!mGoingToDispatchAllMessages) {
nsCOMPtr<nsIRunnable> event =
NewRunnableMethod("dom::EventSourceImpl::DispatchAllMessageEvents",
this, &EventSourceImpl::DispatchAllMessageEvents);
NS_ENSURE_STATE(event);
mGoingToDispatchAllMessages = true;
return Dispatch(event.forget(), NS_DISPATCH_NORMAL);
}
return NS_OK;
}
void EventSourceImpl::DispatchAllMessageEvents() {
AssertIsOnTargetThread();
mGoingToDispatchAllMessages = false;
if (IsClosed() || mFrozen) {
return;
}
nsresult rv;
AutoJSAPI jsapi;
{
auto lock = mSharedData.Lock();
rv = lock->mEventSource->CheckCurrentGlobalCorrectness();
if (NS_FAILED(rv)) {
return;
}
if (NS_WARN_IF(!jsapi.Init(lock->mEventSource->GetOwnerGlobal()))) {
return;
}
}
JSContext* cx = jsapi.cx();
while (mMessagesToDispatch.GetSize() > 0) {
UniquePtr<Message> message(mMessagesToDispatch.PopFront());
if (message->mLastEventID.isSome()) {
mLastEventID.Assign(message->mLastEventID.value());
}
if (message->mLastEventID.isNothing() && !mLastEventID.IsEmpty()) {
message->mLastEventID = Some(mLastEventID);
}
{
auto lock = mSharedData.Lock();
if (lock->mServiceNotifier) {
lock->mServiceNotifier->EventReceived(message->mEventName, mLastEventID,
message->mData, mReconnectionTime,
PR_Now());
}
}
// Now we can turn our string into a jsval
JS::Rooted<JS::Value> jsData(cx);
{
JSString* jsString;
jsString = JS_NewUCStringCopyN(cx, message->mData.get(),
message->mData.Length());
NS_ENSURE_TRUE_VOID(jsString);
jsData.setString(jsString);
}
// create an event that uses the MessageEvent interface,
// which does not bubble, is not cancelable, and has no default action
RefPtr<EventSource> eventSource = GetEventSource();
RefPtr<MessageEvent> event =
new MessageEvent(eventSource, nullptr, nullptr);
event->InitMessageEvent(nullptr, message->mEventName, CanBubble::eNo,
Cancelable::eNo, jsData, mOrigin, mLastEventID,
nullptr, Sequence<OwningNonNull<MessagePort>>());
event->SetTrusted(true);
// We can't hold the mutex while dispatching the event because the mutex is
// not reentrant, and content might call back into our code.
IgnoredErrorResult err;
eventSource->DispatchEvent(*event, err);
if (err.Failed()) {
NS_WARNING("Failed to dispatch the message event!!!");
return;
}
if (IsClosed() || mFrozen) {
return;
}
}
}
void EventSourceImpl::ClearFields() {
AssertIsOnTargetThread();
mCurrentMessage = nullptr;
mLastFieldName.Truncate();
mLastFieldValue.Truncate();
}
nsresult EventSourceImpl::SetFieldAndClear() {
MOZ_ASSERT(!mIsShutDown);
AssertIsOnTargetThread();
if (mLastFieldName.IsEmpty()) {
mLastFieldValue.Truncate();
return NS_OK;
}
if (!mCurrentMessage) {
mCurrentMessage = MakeUnique<Message>();
}
char16_t first_char;
first_char = mLastFieldName.CharAt(0);
// with no case folding performed
switch (first_char) {
case char16_t('d'):
if (mLastFieldName.EqualsLiteral("data")) {
// If the field name is "data" append the field value to the data
// buffer, then append a single U+000A LINE FEED (LF) character
// to the data buffer.
mCurrentMessage->mData.Append(mLastFieldValue);
mCurrentMessage->mData.Append(LF_CHAR);
}
break;
case char16_t('e'):
if (mLastFieldName.EqualsLiteral("event")) {
mCurrentMessage->mEventName.Assign(mLastFieldValue);
}
break;
case char16_t('i'):
if (mLastFieldName.EqualsLiteral("id")) {
mCurrentMessage->mLastEventID = Some(mLastFieldValue);
}
break;
case char16_t('r'):
if (mLastFieldName.EqualsLiteral("retry")) {
uint32_t newValue = 0;
uint32_t i = 0; // we must ensure that there are only digits
bool assign = true;
for (i = 0; i < mLastFieldValue.Length(); ++i) {
if (mLastFieldValue.CharAt(i) < (char16_t)'0' ||
mLastFieldValue.CharAt(i) > (char16_t)'9') {
assign = false;
break;
}
newValue = newValue * 10 + (((uint32_t)mLastFieldValue.CharAt(i)) -
((uint32_t)((char16_t)'0')));
}
if (assign) {
if (newValue < MIN_RECONNECTION_TIME_VALUE) {
mReconnectionTime = MIN_RECONNECTION_TIME_VALUE;
} else if (newValue > MAX_RECONNECTION_TIME_VALUE) {
mReconnectionTime = MAX_RECONNECTION_TIME_VALUE;
} else {
mReconnectionTime = newValue;
}
}
break;
}
break;
}
mLastFieldName.Truncate();
mLastFieldValue.Truncate();
return NS_OK;
}
nsresult EventSourceImpl::CheckHealthOfRequestCallback(
nsIRequest* aRequestCallback) {
// This function could be run on target thread if http channel support
// nsIThreadRetargetableRequest. otherwise, it's run on main thread.
// check if we have been closed or if the request has been canceled
// or if we have been frozen
if (IsClosed() || mFrozen || !mHttpChannel) {
return NS_ERROR_ABORT;
}
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequestCallback);
NS_ENSURE_STATE(httpChannel);
if (httpChannel != mHttpChannel) {
NS_WARNING("wrong channel from request callback");
return NS_ERROR_ABORT;
}
return NS_OK;
}
nsresult EventSourceImpl::ParseCharacter(char16_t aChr) {
AssertIsOnTargetThread();
nsresult rv;
if (IsClosed()) {
return NS_ERROR_ABORT;
}
switch (mStatus) {
case PARSE_STATE_OFF:
NS_ERROR("Invalid state");
return NS_ERROR_FAILURE;
break;
case PARSE_STATE_BEGIN_OF_STREAM:
if (aChr == CR_CHAR) {
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
mStatus = PARSE_STATE_BEGIN_OF_LINE;
} else if (aChr == COLON_CHAR) {
mStatus = PARSE_STATE_COMMENT;
} else {
mLastFieldName += aChr;
mStatus = PARSE_STATE_FIELD_NAME;
}
break;
case PARSE_STATE_CR_CHAR:
if (aChr == CR_CHAR) {
rv = DispatchCurrentMessageEvent(); // there is an empty line (CRCR)
NS_ENSURE_SUCCESS(rv, rv);
} else if (aChr == LF_CHAR) {
mStatus = PARSE_STATE_BEGIN_OF_LINE;
} else if (aChr == COLON_CHAR) {
mStatus = PARSE_STATE_COMMENT;
} else {
mLastFieldName += aChr;
mStatus = PARSE_STATE_FIELD_NAME;
}
break;
case PARSE_STATE_COMMENT:
if (aChr == CR_CHAR) {
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
mStatus = PARSE_STATE_BEGIN_OF_LINE;
}
break;
case PARSE_STATE_FIELD_NAME:
if (aChr == CR_CHAR) {
rv = SetFieldAndClear();
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
rv = SetFieldAndClear();
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_BEGIN_OF_LINE;
} else if (aChr == COLON_CHAR) {
mStatus = PARSE_STATE_FIRST_CHAR_OF_FIELD_VALUE;
} else {
mLastFieldName += aChr;
}
break;
case PARSE_STATE_FIRST_CHAR_OF_FIELD_VALUE:
if (aChr == CR_CHAR) {
rv = SetFieldAndClear();
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
rv = SetFieldAndClear();
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_BEGIN_OF_LINE;
} else if (aChr == SPACE_CHAR) {
mStatus = PARSE_STATE_FIELD_VALUE;
} else {
mLastFieldValue += aChr;
mStatus = PARSE_STATE_FIELD_VALUE;
}
break;
case PARSE_STATE_FIELD_VALUE:
if (aChr == CR_CHAR) {
rv = SetFieldAndClear();
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
rv = SetFieldAndClear();
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_BEGIN_OF_LINE;
} else if (aChr != 0) {
// Avoid appending the null char to the field value.
mLastFieldValue += aChr;
} else if (mLastFieldName.EqualsLiteral("id")) {
// Ignore the whole id field if aChr is null
mStatus = PARSE_STATE_IGNORE_FIELD_VALUE;
mLastFieldValue.Truncate();
}
break;
case PARSE_STATE_IGNORE_FIELD_VALUE:
if (aChr == CR_CHAR) {
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
mStatus = PARSE_STATE_BEGIN_OF_LINE;
}
break;
case PARSE_STATE_BEGIN_OF_LINE:
if (aChr == CR_CHAR) {
rv = DispatchCurrentMessageEvent(); // there is an empty line
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_CR_CHAR;
} else if (aChr == LF_CHAR) {
rv = DispatchCurrentMessageEvent(); // there is an empty line
NS_ENSURE_SUCCESS(rv, rv);
mStatus = PARSE_STATE_BEGIN_OF_LINE;
} else if (aChr == COLON_CHAR) {
mStatus = PARSE_STATE_COMMENT;
} else if (aChr != 0) {
// Avoid appending the null char to the field name.
mLastFieldName += aChr;
mStatus = PARSE_STATE_FIELD_NAME;
}
break;
}
return NS_OK;
}
namespace {
class WorkerRunnableDispatcher final : public WorkerThreadRunnable {
RefPtr<EventSourceImpl> mEventSourceImpl;
public:
WorkerRunnableDispatcher(RefPtr<EventSourceImpl>&& aImpl,
WorkerPrivate* aWorkerPrivate,
already_AddRefed<nsIRunnable> aEvent)
: WorkerThreadRunnable("WorkerRunnableDispatcher"),
mEventSourceImpl(std::move(aImpl)),
mEvent(std::move(aEvent)) {}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
aWorkerPrivate->AssertIsOnWorkerThread();
return !NS_FAILED(mEvent->Run());
}
void PostRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
bool aRunResult) override {
// Ensure we drop the RefPtr on the worker thread
// and to not keep us alive longer than needed.
mEventSourceImpl = nullptr;
}
bool PreDispatch(WorkerPrivate* aWorkerPrivate) override {
// We don't call WorkerRunnable::PreDispatch because it would assert the
// wrong thing about which thread we're on. We're on whichever thread the
// channel implementation is running on (probably the main thread or
// transport thread).
return true;
}
void PostDispatch(WorkerPrivate* aWorkerPrivate,
bool aDispatchResult) override {
// We don't call WorkerRunnable::PostDispatch because it would assert the
// wrong thing about which thread we're on. We're on whichever thread the
// channel implementation is running on (probably the main thread or
// transport thread).
}
private:
nsCOMPtr<nsIRunnable> mEvent;
};
} // namespace
bool EventSourceImpl::CreateWorkerRef(WorkerPrivate* aWorkerPrivate) {
MOZ_ASSERT(!mWorkerRef);
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
if (mIsShutDown) {
return false;
}
RefPtr<EventSourceImpl> self = this;
RefPtr<StrongWorkerRef> workerRef = StrongWorkerRef::Create(
aWorkerPrivate, "EventSource", [self]() { self->Close(); });
if (NS_WARN_IF(!workerRef)) {
return false;
}
mWorkerRef = new ThreadSafeWorkerRef(workerRef);
return true;
}
void EventSourceImpl::ReleaseWorkerRef() {
MOZ_ASSERT(IsClosed());
MOZ_ASSERT(IsCurrentThreadRunningWorker());
mWorkerRef = nullptr;
}
//-----------------------------------------------------------------------------
// EventSourceImpl::nsIEventTarget
//-----------------------------------------------------------------------------
NS_IMETHODIMP
EventSourceImpl::DispatchFromScript(nsIRunnable* aEvent, uint32_t aFlags) {
nsCOMPtr<nsIRunnable> event(aEvent);
return Dispatch(event.forget(), aFlags);
}
NS_IMETHODIMP
EventSourceImpl::Dispatch(already_AddRefed<nsIRunnable> aEvent,
uint32_t aFlags) {
nsCOMPtr<nsIRunnable> event_ref(aEvent);
if (mIsMainThread) {
return NS_DispatchToMainThread(event_ref.forget());
}
if (mIsShutDown) {
// We want to avoid clutter about errors in our shutdown logs,
// so just report NS_OK (we have no explicit return value
// for shutdown).
return NS_OK;
}
// If the target is a worker, we have to use a custom WorkerRunnableDispatcher
// runnable.
RefPtr<WorkerRunnableDispatcher> event = new WorkerRunnableDispatcher(
this, mWorkerRef->Private(), event_ref.forget());
if (!event->Dispatch(mWorkerRef->Private())) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
EventSourceImpl::DelayedDispatch(already_AddRefed<nsIRunnable> aEvent,
uint32_t aDelayMs) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
EventSourceImpl::RegisterShutdownTask(nsITargetShutdownTask*) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
EventSourceImpl::UnregisterShutdownTask(nsITargetShutdownTask*) {
return NS_ERROR_NOT_IMPLEMENTED;
}
//-----------------------------------------------------------------------------
// EventSourceImpl::nsIThreadRetargetableStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
EventSourceImpl::CheckListenerChain() {
MOZ_ASSERT(NS_IsMainThread(), "Should be on the main thread!");
return NS_OK;
}
NS_IMETHODIMP
EventSourceImpl::OnDataFinished(nsresult) { return NS_OK; }
////////////////////////////////////////////////////////////////////////////////
// EventSource
////////////////////////////////////////////////////////////////////////////////
EventSource::EventSource(nsIGlobalObject* aGlobal,
nsICookieJarSettings* aCookieJarSettings,
bool aWithCredentials)
: DOMEventTargetHelper(aGlobal),
mWithCredentials(aWithCredentials),
mIsMainThread(NS_IsMainThread()) {
MOZ_ASSERT(aGlobal);
MOZ_ASSERT(aCookieJarSettings);
mESImpl = new EventSourceImpl(this, aCookieJarSettings);
}
EventSource::~EventSource() = default;
nsresult EventSource::CreateAndDispatchSimpleEvent(const nsAString& aName) {
RefPtr<Event> event = NS_NewDOMEvent(this, nullptr, nullptr);
// it doesn't bubble, and it isn't cancelable
event->InitEvent(aName, false, false);
event->SetTrusted(true);
ErrorResult rv;
DispatchEvent(*event, rv);
return rv.StealNSResult();
}
/* static */
already_AddRefed<EventSource> EventSource::Constructor(
const GlobalObject& aGlobal, const nsAString& aURL,
const EventSourceInit& aEventSourceInitDict, ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
if (NS_WARN_IF(!global)) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
nsCOMPtr<nsPIDOMWindowInner> ownerWindow = do_QueryInterface(global);
if (ownerWindow) {
Document* doc = ownerWindow->GetExtantDoc();
if (NS_WARN_IF(!doc)) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
cookieJarSettings = doc->CookieJarSettings();
} else {
// Worker side.
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
if (!workerPrivate) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
cookieJarSettings = workerPrivate->CookieJarSettings();
}
RefPtr<EventSource> eventSource = new EventSource(
global, cookieJarSettings, aEventSourceInitDict.mWithCredentials);
if (NS_IsMainThread()) {
// Get principal from document and init EventSourceImpl
nsCOMPtr<nsIScriptObjectPrincipal> scriptPrincipal =
do_QueryInterface(aGlobal.GetAsSupports());
if (!scriptPrincipal) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
nsCOMPtr<nsIPrincipal> principal = scriptPrincipal->GetPrincipal();
if (!principal) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
eventSource->mESImpl->Init(global, principal, aURL, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
eventSource->mESImpl->InitChannelAndRequestEventSource(true);
return eventSource.forget();
}
// Worker side.
{
// Scope for possible failures that need cleanup
auto guardESImpl = MakeScopeExit([&] { eventSource->mESImpl = nullptr; });
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
eventSource->mESImpl->mInnerWindowID = workerPrivate->WindowID();
eventSource->mESImpl->Init(nullptr, workerPrivate->GetPrincipal(), aURL,
aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// In workers we have to keep the worker alive using a WorkerRef in order
// to dispatch messages correctly.
if (!eventSource->mESImpl->CreateWorkerRef(workerPrivate)) {
// The worker is already shutting down. Let's return an already closed
// object, but marked as Connecting.
if (eventSource->mESImpl) {
// mESImpl is nulled by this call such that EventSourceImpl is
// released before returning the object, otherwise
// it will set EventSource to a CLOSED state in its DTOR..
eventSource->mESImpl->Close();
}
eventSource->mReadyState = EventSourceImpl::CONNECTING;
guardESImpl.release();
return eventSource.forget();
}
// Let's connect to the server.
RefPtr<ConnectRunnable> connectRunnable =
new ConnectRunnable(workerPrivate, eventSource->mESImpl);
connectRunnable->Dispatch(workerPrivate, Canceling, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// End of scope for possible failures
guardESImpl.release();
}
return eventSource.forget();
}
// nsWrapperCache
JSObject* EventSource::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return EventSource_Binding::Wrap(aCx, this, aGivenProto);
}
void EventSource::Close() {
AssertIsOnTargetThread();
if (mESImpl) {
// Close potentially kills ourself, ensure
// to not access any members afterwards.
mESImpl->Close();
}
}
//-----------------------------------------------------------------------------
// EventSource::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_CYCLE_COLLECTION_CLASS(EventSource)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(EventSource,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(EventSource,
DOMEventTargetHelper)
if (tmp->mESImpl) {
// IsCertainlyaliveForCC will return true and cause the cycle
// collector to skip this instance when mESImpl is non-null and
// points back to ourself.
// mESImpl is initialized to be non-null in the constructor
// and should have been wiped out in our close function.
MOZ_ASSERT_UNREACHABLE("Paranoia cleanup that should never happen.");
tmp->Close();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
bool EventSource::IsCertainlyAliveForCC() const {
// Until we are double linked forth and back, we want to stay alive.
if (!mESImpl) {
return false;
}
auto lock = mESImpl->mSharedData.Lock();
return lock->mEventSource == this;
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EventSource)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(EventSource, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(EventSource, DOMEventTargetHelper)
} // namespace mozilla::dom
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