summaryrefslogtreecommitdiffstats
path: root/dom/base/EventSource.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--dom/base/EventSource.cpp2144
1 files changed, 2144 insertions, 0 deletions
diff --git a/dom/base/EventSource.cpp b/dom/base/EventSource.cpp
new file mode 100644
index 0000000000..86a8b98758
--- /dev/null
+++ b/dom/base/EventSource.cpp
@@ -0,0 +1,2144 @@
+/* -*- 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/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/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 "nsIObserverService.h"
+#include "nsIScriptObjectPrincipal.h"
+#include "nsJSUtils.h"
+#include "nsIThreadRetargetableRequest.h"
+#include "nsIAsyncVerifyRedirectCallback.h"
+#include "nsIScriptError.h"
+#include "nsContentUtils.h"
+#include "mozilla/Preferences.h"
+#include "xpcpublic.h"
+#include "nsWrapperCacheInlines.h"
+#include "mozilla/Attributes.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.server-events.default-reconnection-time
+#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 nsIObserver,
+ public nsIStreamListener,
+ public nsIChannelEventSink,
+ public nsIInterfaceRequestor,
+ public nsSupportsWeakReference,
+ public nsISerialEventTarget,
+ public nsITimerCallback,
+ public nsINamed,
+ public nsIThreadRetargetableStreamListener {
+ public:
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_NSIOBSERVER
+ 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(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();
+
+ 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 AddWindowObservers();
+ 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
+ nsString mScriptFile;
+ uint32_t mScriptLine;
+ uint32_t mScriptColumn;
+ 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, nsIObserver, nsIStreamListener,
+ nsIRequestObserver, nsIChannelEventSink,
+ nsIInterfaceRequestor, nsISupportsWeakReference,
+ 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"),
+ mScriptLine(0),
+ mScriptColumn(0),
+ 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);
+ mWorkerPrivate->AssertIsOnWorkerThread();
+ }
+
+ 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(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 InitRunnable final : public WorkerMainThreadRunnable {
+ public:
+ InitRunnable(WorkerPrivate* aWorkerPrivate,
+ RefPtr<EventSourceImpl> aEventSourceImpl, const nsAString& aURL)
+ : WorkerMainThreadRunnable(aWorkerPrivate, "EventSource :: Init"_ns),
+ mESImpl(std::move(aEventSourceImpl)),
+ mURL(aURL),
+ mRv(NS_ERROR_NOT_INITIALIZED) {
+ MOZ_ASSERT(aWorkerPrivate);
+ aWorkerPrivate->AssertIsOnWorkerThread();
+ MOZ_ASSERT(mESImpl);
+ }
+
+ bool MainThreadRun() override {
+ // Get principal from worker's owner document or from worker.
+ WorkerPrivate* wp = mWorkerPrivate;
+ while (wp->GetParent()) {
+ wp = wp->GetParent();
+ }
+ nsPIDOMWindowInner* window = wp->GetWindow();
+ Document* doc = window ? window->GetExtantDoc() : nullptr;
+ nsCOMPtr<nsIPrincipal> principal =
+ doc ? doc->NodePrincipal() : wp->GetPrincipal();
+ if (!principal) {
+ mRv = NS_ERROR_FAILURE;
+ return true;
+ }
+ ErrorResult rv;
+ mESImpl->Init(principal, mURL, rv);
+ mRv = rv.StealNSResult();
+
+ // We want to ensure that EventSourceImpl's lifecycle
+ // does not depend on this Runnable's one.
+ mESImpl = nullptr;
+
+ return true;
+ }
+
+ nsresult ErrorCode() const { return mRv; }
+
+ private:
+ RefPtr<EventSourceImpl> mESImpl;
+ const nsAString& mURL;
+ nsresult mRv;
+};
+
+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) {
+ AssertIsOnMainThread();
+ MOZ_ASSERT(!mIsShutDown);
+ // get the src
+ nsCOMPtr<nsIURI> baseURI;
+ nsresult rv = GetBaseURI(getter_AddRefs(baseURI));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIURI> srcURI;
+ rv = NS_NewURI(getter_AddRefs(srcURI), aURL, nullptr, baseURI);
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_DOM_SYNTAX_ERR);
+
+ nsAutoString origin;
+ rv = nsContentUtils::GetUTFOrigin(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::AddWindowObservers() {
+ AssertIsOnMainThread();
+ MOZ_ASSERT(mIsMainThread);
+ MOZ_ASSERT(!mIsShutDown);
+ nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+ NS_ENSURE_STATE(os);
+
+ nsresult rv = os->AddObserver(this, DOM_WINDOW_DESTROYED_TOPIC, true);
+ NS_ENSURE_SUCCESS(rv, rv);
+ rv = os->AddObserver(this, DOM_WINDOW_FROZEN_TOPIC, true);
+ NS_ENSURE_SUCCESS(rv, rv);
+ rv = os->AddObserver(this, DOM_WINDOW_THAWED_TOPIC, true);
+ NS_ENSURE_SUCCESS(rv, rv);
+ return NS_OK;
+}
+
+void EventSourceImpl::RemoveWindowObservers() {
+ AssertIsOnMainThread();
+ MOZ_ASSERT(mIsMainThread);
+ MOZ_ASSERT(IsClosed());
+ nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+ if (os) {
+ os->RemoveObserver(this, DOM_WINDOW_DESTROYED_TOPIC);
+ os->RemoveObserver(this, DOM_WINDOW_FROZEN_TOPIC);
+ os->RemoveObserver(this, DOM_WINDOW_THAWED_TOPIC);
+ }
+}
+
+void EventSourceImpl::Init(nsIPrincipal* aPrincipal, const nsAString& aURL,
+ ErrorResult& aRv) {
+ AssertIsOnMainThread();
+ 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()) {
+ nsJSUtils::GetCallingLocation(cx, mScriptFile, &mScriptLine,
+ &mScriptColumn);
+ mInnerWindowID = nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(cx);
+ }
+
+ if (mIsMainThread) {
+ // we observe when the window freezes and thaws
+ aRv = AddWindowObservers();
+ if (NS_WARN_IF(aRv.Failed())) {
+ return;
+ }
+ }
+
+ mReconnectionTime =
+ Preferences::GetInt("dom.server-events.default-reconnection-time",
+ DEFAULT_RECONNECTION_TIME_VALUE);
+
+ mUnicodeDecoder = UTF_8_ENCODING->NewDecoderWithBOMRemoval();
+}
+
+//-----------------------------------------------------------------------------
+// EventSourceImpl::nsIObserver
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+EventSourceImpl::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aData) {
+ AssertIsOnMainThread();
+ if (IsClosed()) {
+ return NS_OK;
+ }
+
+ nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aSubject);
+ MOZ_ASSERT(mIsMainThread);
+ {
+ auto lock = mSharedData.Lock();
+ if (!lock->mEventSource->GetOwner() ||
+ window != lock->mEventSource->GetOwner()) {
+ return NS_OK;
+ }
+ }
+
+ DebugOnly<nsresult> rv;
+ if (strcmp(aTopic, DOM_WINDOW_FROZEN_TOPIC) == 0) {
+ rv = Freeze();
+ MOZ_ASSERT(NS_SUCCEEDED(rv), "Freeze() failed");
+ } else if (strcmp(aTopic, DOM_WINDOW_THAWED_TOPIC) == 0) {
+ rv = Thaw();
+ MOZ_ASSERT(NS_SUCCEEDED(rv), "Thaw() failed");
+ } else if (strcmp(aTopic, DOM_WINDOW_DESTROYED_TOPIC) == 0) {
+ Close();
+ }
+
+ return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// 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
+ return NS_ERROR_ABORT;
+ }
+
+ 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) {
+ 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 (lock->mEventSource->GetOwner()) {
+ window = lock->mEventSource->GetOwner()->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) {
+ AssertIsOnMainThread();
+ 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)) {
+ mWorkerPrivate->AssertIsOnWorkerThread();
+ 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(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, mScriptFile, u""_ns, mScriptLine,
+ mScriptColumn, 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 WorkerRunnable {
+ RefPtr<EventSourceImpl> mEventSourceImpl;
+
+ public:
+ WorkerRunnableDispatcher(RefPtr<EventSourceImpl>&& aImpl,
+ WorkerPrivate* aWorkerPrivate,
+ already_AddRefed<nsIRunnable> aEvent)
+ : WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
+ 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()) {
+ 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;
+}
+////////////////////////////////////////////////////////////////////////////////
+// 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(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();
+
+ RefPtr<InitRunnable> initRunnable =
+ new InitRunnable(workerPrivate, eventSource->mESImpl, aURL);
+ initRunnable->Dispatch(Canceling, aRv);
+ if (NS_WARN_IF(aRv.Failed())) {
+ return nullptr;
+ }
+
+ aRv = initRunnable->ErrorCode();
+ 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.
+ // Note, initRunnable->Dispatch may have cleared mESImpl.
+ if (!eventSource->mESImpl ||
+ !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(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