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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/dom/EventSource.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/DOMEventTargetHelper.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/UniquePtrExtensions.h"
#include "nsAutoPtr.h"
#include "nsIThreadRetargetableStreamListener.h"
#include "nsNetUtil.h"
#include "nsIAuthPrompt.h"
#include "nsIAuthPrompt2.h"
#include "nsIInputStream.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsMimeTypes.h"
#include "nsIPromptFactory.h"
#include "nsIWindowWatcher.h"
#include "nsPresContext.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 "nsIContentSecurityPolicy.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"
namespace mozilla {
namespace dom {
static LazyLogModule gEventSourceLog("EventSource");
#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 nsIEventTarget
, 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_NSITHREADRETARGETABLESTREAMLISTENER
explicit EventSourceImpl(EventSource* aEventSource);
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 SetupReferrerPolicy();
nsresult InitChannelAndRequestEventSource();
nsresult ResetConnection();
void ResetDecoder();
nsresult SetReconnectionTimeout();
void AnnounceConnection();
void DispatchAllMessageEvents();
nsresult RestartConnection();
void ReestablishConnection();
void DispatchFailConnection();
void FailConnection();
nsresult Thaw();
nsresult Freeze();
static void TimerCallback(nsITimer* aTimer, void* aClosure);
nsresult PrintErrorOnConsole(const char* aBundleURI,
const char* aError,
const char16_t** aFormatStrings,
uint32_t aFormatStringsLen);
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();
void AddRefObject();
void ReleaseObject();
bool CreateWorkerRef(WorkerPrivate* aWorkerPrivate);
void ReleaseWorkerRef();
void AssertIsOnTargetThread() const
{
MOZ_ASSERT(IsTargetThread());
}
bool IsTargetThread() const
{
return NS_IsMainThread() == mIsMainThread;
}
uint16_t ReadyState()
{
MutexAutoLock lock(mMutex);
if (mEventSource) {
return 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)
{
MutexAutoLock lock(mMutex);
MOZ_ASSERT(mEventSource);
MOZ_ASSERT(!mIsShutDown);
mEventSource->mReadyState = aReadyState;
}
bool IsFrozen()
{
MutexAutoLock lock(mMutex);
return mFrozen;
}
void SetFrozen(bool aFrozen)
{
MutexAutoLock lock(mMutex);
mFrozen = aFrozen;
}
bool IsClosed()
{
return ReadyState() == CLOSED;
}
void ShutDown()
{
MutexAutoLock lock(mMutex);
MOZ_ASSERT(!mIsShutDown);
mIsShutDown = true;
}
bool IsShutDown()
{
MutexAutoLock lock(mMutex);
return mIsShutDown;
}
RefPtr<EventSource> 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_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;
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 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;
// This mutex protects mFrozen and mEventSource->mReadyState that are used in
// different threads.
mozilla::Mutex mMutex;
// Whether the window is frozen. May be set on main thread and read on target
// thread. Use mMutex to protect it before accessing it.
bool mFrozen;
// There are some messages are going to be dispatched when thaw.
bool mGoingToDispatchAllMessages;
// Whether the EventSource is run on main thread.
bool mIsMainThread;
// Whether the EventSourceImpl is going to be destroyed.
bool mIsShutDown;
// 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:
// 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,
nsIEventTarget,
nsIThreadRetargetableStreamListener)
EventSourceImpl::EventSourceImpl(EventSource* aEventSource)
: mEventSource(aEventSource)
, mReconnectionTime(0)
, mStatus(PARSE_STATE_OFF)
, mMutex("EventSourceImpl::mMutex")
, mFrozen(false)
, mGoingToDispatchAllMessages(false)
, mIsMainThread(NS_IsMainThread())
, mIsShutDown(false)
, mScriptLine(0)
, mScriptColumn(0)
, mInnerWindowID(0)
{
MOZ_ASSERT(mEventSource);
if (!mIsMainThread) {
mEventSource->mIsMainThread = false;
}
SetReadyState(CONNECTING);
}
class CleanupRunnable final : public WorkerMainThreadRunnable
{
public:
explicit CleanupRunnable(EventSourceImpl* aEventSourceImpl)
: WorkerMainThreadRunnable(GetCurrentThreadWorkerPrivate(),
NS_LITERAL_CSTRING("EventSource :: Cleanup"))
, mImpl(aEventSourceImpl)
{
mWorkerPrivate->AssertIsOnWorkerThread();
}
bool MainThreadRun() override
{
mImpl->CleanupOnMainThread();
return true;
}
protected:
// Raw pointer because this runnable is sync.
EventSourceImpl* mImpl;
};
void
EventSourceImpl::Close()
{
if (IsClosed()) {
return;
}
SetReadyState(CLOSED);
CloseInternal();
}
void
EventSourceImpl::CloseInternal()
{
AssertIsOnTargetThread();
MOZ_ASSERT(IsClosed());
if (IsShutDown()) {
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 static_cast<Message*>(mMessagesToDispatch.PopFront());
}
SetFrozen(false);
ResetDecoder();
mUnicodeDecoder = nullptr;
// UpdateDontKeepAlive() can release the object. Don't access to any members
// after it.
mEventSource->UpdateDontKeepAlive();
}
void EventSourceImpl::CleanupOnMainThread()
{
AssertIsOnMainThread();
MOZ_ASSERT(IsClosed());
// Call ShutDown before cleaning any members.
ShutDown();
if (mIsMainThread) {
RemoveWindowObservers();
}
if (mTimer) {
mTimer->Cancel();
mTimer = nullptr;
}
ResetConnection();
mPrincipal = nullptr;
mSrc = nullptr;
}
class InitRunnable final : public WorkerMainThreadRunnable
{
public:
InitRunnable(WorkerPrivate* aWorkerPrivate,
EventSourceImpl* aEventSourceImpl,
const nsAString& aURL)
: WorkerMainThreadRunnable(aWorkerPrivate,
NS_LITERAL_CSTRING("EventSource :: Init"))
, mImpl(aEventSourceImpl)
, mURL(aURL)
, mRv(NS_ERROR_NOT_INITIALIZED)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
}
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();
nsIDocument* doc = window ? window->GetExtantDoc() : nullptr;
nsCOMPtr<nsIPrincipal> principal = doc ? doc->NodePrincipal() :
wp->GetPrincipal();
if (!principal) {
mRv = NS_ERROR_FAILURE;
return true;
}
ErrorResult rv;
mImpl->Init(principal, mURL, rv);
mRv = rv.StealNSResult();
return true;
}
nsresult ErrorCode() const { return mRv; }
private:
// Raw pointer because this runnable is sync.
EventSourceImpl* mImpl;
const nsAString& mURL;
nsresult mRv;
};
class ConnectRunnable final : public WorkerMainThreadRunnable
{
public:
explicit ConnectRunnable(WorkerPrivate* aWorkerPrivate,
EventSourceImpl* aEventSourceImpl)
: WorkerMainThreadRunnable(aWorkerPrivate,
NS_LITERAL_CSTRING("EventSource :: Connect"))
, mImpl(aEventSourceImpl)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
}
bool MainThreadRun() override
{
mImpl->InitChannelAndRequestEventSource();
return true;
}
private:
RefPtr<EventSourceImpl> mImpl;
};
nsresult
EventSourceImpl::ParseURL(const nsAString& aURL)
{
AssertIsOnMainThread();
MOZ_ASSERT(!IsShutDown());
// 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);
mEventSource->mOriginalURL = NS_ConvertUTF8toUTF16(spec);
mSrc = srcURI;
mOrigin = origin;
return NS_OK;
}
nsresult
EventSourceImpl::AddWindowObservers()
{
AssertIsOnMainThread();
MOZ_ASSERT(mIsMainThread);
MOZ_ASSERT(!IsShutDown());
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);
if (!mEventSource->GetOwner() || window != 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, nsISupports* aCtxt)
{
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");
}
}
}
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)
{
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->IsShutDown());
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 = MakeSpan(buffer);
auto src = AsBytes(MakeSpan(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;
bool hadErrors;
Tie(result, read, written, hadErrors) =
mUnicodeDecoder->DecodeToUTF16(src, dst, false);
Unused << hadErrors;
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,
nsISupports* aContext,
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,
nsISupports* aContext,
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.
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_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 = do_QueryInterface(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 =
(NS_SUCCEEDED(newURI->SchemeIs("http", &isValidScheme)) && isValidScheme) ||
(NS_SUCCEEDED(newURI->SchemeIs("https", &isValidScheme)) && isValidScheme);
rv = mEventSource->CheckInnerWindowCorrectness();
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 and referrer policy on
// redirects, so we don't need to SetupReferrerPolicy().
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 = mEventSource->CheckInnerWindowCorrectness();
NS_ENSURE_SUCCESS(rv, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsIPromptFactory> wwatch =
do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
// Get the an auth prompter for our window so that the parenting
// of the dialogs works as it should when using tabs.
nsCOMPtr<nsPIDOMWindowOuter> window;
if (mEventSource->GetOwner()) {
window = mEventSource->GetOwner()->GetOuterWindow();
}
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(!IsShutDown());
NS_ENSURE_ARG_POINTER(aBaseURI);
*aBaseURI = nullptr;
nsCOMPtr<nsIURI> baseURI;
// first we try from document->GetBaseURI()
nsCOMPtr<nsIDocument> doc = mEventSource->GetDocumentIfCurrent();
if (doc) {
baseURI = doc->GetBaseURI();
}
// otherwise we get from the doc's principal
if (!baseURI) {
nsresult rv = mPrincipal->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(!IsShutDown());
nsresult rv = mHttpChannel->SetRequestMethod(NS_LITERAL_CSTRING("GET"));
MOZ_ASSERT(NS_SUCCEEDED(rv));
/* set the http request headers */
rv = mHttpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
NS_LITERAL_CSTRING(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(NS_LITERAL_CSTRING("Last-Event-ID"),
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::SetupReferrerPolicy()
{
AssertIsOnMainThread();
MOZ_ASSERT(!IsShutDown());
nsCOMPtr<nsIDocument> doc = mEventSource->GetDocumentIfCurrent();
if (doc) {
nsresult rv = mHttpChannel->SetReferrerWithPolicy(doc->GetDocumentURI(),
doc->GetReferrerPolicy());
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
nsresult
EventSourceImpl::InitChannelAndRequestEventSource()
{
AssertIsOnMainThread();
if (IsClosed()) {
return NS_ERROR_ABORT;
}
bool isValidScheme =
(NS_SUCCEEDED(mSrc->SchemeIs("http", &isValidScheme)) && isValidScheme) ||
(NS_SUCCEEDED(mSrc->SchemeIs("https", &isValidScheme)) && isValidScheme);
nsresult rv = mEventSource->CheckInnerWindowCorrectness();
if (NS_FAILED(rv) || !isValidScheme) {
DispatchFailConnection();
return NS_ERROR_DOM_SECURITY_ERR;
}
// 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<nsIDocument> doc = mEventSource->GetDocumentIfCurrent();
nsSecurityFlags securityFlags =
nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
if (mEventSource->mWithCredentials) {
securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
}
nsCOMPtr<nsIChannel> channel;
// If we have the document, use it
if (doc) {
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,
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 = SetupReferrerPolicy();
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->AsyncOpen2(this);
if (NS_FAILED(rv)) {
DispatchFailConnection();
return rv;
}
// Create the connection. Ask EventSource to hold reference until Close is
// called or network error is received.
mEventSource->UpdateMustKeepAlive();
return rv;
}
void
EventSourceImpl::AnnounceConnection()
{
AssertIsOnTargetThread();
if (ReadyState() != CONNECTING) {
NS_WARNING("Unexpected mReadyState!!!");
return;
}
// 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 = mEventSource->CheckInnerWindowCorrectness();
if (NS_FAILED(rv)) {
return;
}
rv = mEventSource->CreateAndDispatchSimpleEvent(NS_LITERAL_STRING("open"));
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(EventSourceImpl* aEventSourceImpl)
: WorkerMainThreadRunnable(
aEventSourceImpl->mWorkerRef->Private(),
NS_LITERAL_CSTRING("EventSource :: RestartConnection"))
, mImpl(aEventSourceImpl)
{
mWorkerPrivate->AssertIsOnWorkerThread();
}
bool MainThreadRun() override
{
mImpl->RestartConnection();
return true;
}
protected:
// Raw pointer because this runnable is sync.
EventSourceImpl* mImpl;
};
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 = mEventSource->CheckInnerWindowCorrectness();
if (NS_FAILED(rv)) {
return;
}
SetReadyState(CONNECTING);
ResetDecoder();
rv = mEventSource->CreateAndDispatchSimpleEvent(NS_LITERAL_STRING("error"));
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);
}
nsresult rv = mTimer->InitWithNamedFuncCallback(
TimerCallback,
this,
mReconnectionTime,
nsITimer::TYPE_ONE_SHOT,
"dom::EventSourceImpl::SetReconnectionTimeout");
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
EventSourceImpl::PrintErrorOnConsole(const char* aBundleURI,
const char* aError,
const char16_t** aFormatStrings,
uint32_t aFormatStringsLen)
{
AssertIsOnMainThread();
MOZ_ASSERT(!IsShutDown());
nsCOMPtr<nsIStringBundleService> bundleService =
mozilla::services::GetStringBundleService();
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) {
rv = strBundle->FormatStringFromName(aError, aFormatStrings,
aFormatStringsLen, message);
} else {
rv = strBundle->GetStringFromName(aError, message);
}
NS_ENSURE_SUCCESS(rv, rv);
rv = errObj->InitWithWindowID(message,
mScriptFile,
EmptyString(),
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(!IsShutDown());
nsAutoCString targetSpec;
nsresult rv = mSrc->GetSpec(targetSpec);
NS_ENSURE_SUCCESS(rv, rv);
NS_ConvertUTF8toUTF16 specUTF16(targetSpec);
const char16_t* formatStrings[] = { specUTF16.get() };
if (ReadyState() == CONNECTING) {
rv = PrintErrorOnConsole("chrome://global/locale/appstrings.properties",
"connectionFailure",
formatStrings, ArrayLength(formatStrings));
} else {
rv = PrintErrorOnConsole("chrome://global/locale/appstrings.properties",
"netInterrupt",
formatStrings, ArrayLength(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 = mEventSource->CheckInnerWindowCorrectness();
if (NS_SUCCEEDED(rv)) {
rv = mEventSource->CreateAndDispatchSimpleEvent(NS_LITERAL_STRING("error"));
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();
}
// static
void
EventSourceImpl::TimerCallback(nsITimer* aTimer, void* aClosure)
{
AssertIsOnMainThread();
RefPtr<EventSourceImpl> thisObject = static_cast<EventSourceImpl*>(aClosure);
if (thisObject->IsClosed()) {
return;
}
MOZ_ASSERT(!thisObject->mHttpChannel, "the channel hasn't been cancelled!!");
if (!thisObject->IsFrozen()) {
nsresult rv = thisObject->InitChannelAndRequestEventSource();
if (NS_FAILED(rv)) {
NS_WARNING("thisObject->InitChannelAndRequestEventSource() failed");
return;
}
}
}
nsresult
EventSourceImpl::Thaw()
{
AssertIsOnMainThread();
if (IsClosed() || !IsFrozen()) {
return NS_OK;
}
MOZ_ASSERT(!mHttpChannel, "the connection hasn't been closed!!!");
SetFrozen(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();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
EventSourceImpl::Freeze()
{
AssertIsOnMainThread();
if (IsClosed() || IsFrozen()) {
return NS_OK;
}
MOZ_ASSERT(!mHttpChannel, "the connection hasn't been closed!!!");
SetFrozen(true);
return NS_OK;
}
nsresult
EventSourceImpl::DispatchCurrentMessageEvent()
{
AssertIsOnTargetThread();
MOZ_ASSERT(!IsShutDown());
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");
}
if (message->mLastEventID.IsEmpty() && !mLastEventID.IsEmpty()) {
message->mLastEventID.Assign(mLastEventID);
}
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() || IsFrozen()) {
return;
}
nsresult rv = mEventSource->CheckInnerWindowCorrectness();
if (NS_FAILED(rv)) {
return;
}
AutoJSAPI jsapi;
if (mIsMainThread) {
if (NS_WARN_IF(!jsapi.Init(mEventSource->GetOwner()))) {
return;
}
} else {
MOZ_ASSERT(mWorkerRef);
if (NS_WARN_IF(!jsapi.Init(mWorkerRef->Private()->GlobalScope()))) {
return;
}
}
JSContext* cx = jsapi.cx();
while (mMessagesToDispatch.GetSize() > 0) {
UniquePtr<Message> message(static_cast<Message*>(mMessagesToDispatch.PopFront()));
// 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<MessageEvent> event = new MessageEvent(mEventSource, nullptr,
nullptr);
event->InitMessageEvent(nullptr, message->mEventName, CanBubble::eNo,
Cancelable::eNo, jsData, mOrigin,
message->mLastEventID, nullptr,
Sequence<OwningNonNull<MessagePort>>());
event->SetTrusted(true);
IgnoredErrorResult err;
mEventSource->DispatchEvent(*event, err);
if (err.Failed()) {
NS_WARNING("Failed to dispatch the message event!!!");
return;
}
mLastEventID.Assign(message->mLastEventID);
if (IsClosed() || IsFrozen()) {
return;
}
}
}
void
EventSourceImpl::ClearFields()
{
AssertIsOnTargetThread();
mCurrentMessage = nullptr;
mLastFieldName.Truncate();
mLastFieldValue.Truncate();
}
nsresult
EventSourceImpl::SetFieldAndClear()
{
MOZ_ASSERT(!IsShutDown());
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.Assign(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() || IsFrozen() || !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;
}
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;
}
void
EventSourceImpl::AddRefObject()
{
AddRef();
}
void
EventSourceImpl::ReleaseObject()
{
Release();
}
namespace {
class WorkerRunnableDispatcher final : public WorkerRunnable
{
RefPtr<EventSourceImpl> mEventSourceImpl;
public:
WorkerRunnableDispatcher(EventSourceImpl* aImpl,
WorkerPrivate* aWorkerPrivate,
already_AddRefed<nsIRunnable> aEvent)
: WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
, mEventSourceImpl(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
{
}
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(!IsShutDown());
MOZ_ASSERT(!mWorkerRef);
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
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 (IsShutDown()) {
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;
}
//-----------------------------------------------------------------------------
// EventSourceImpl::nsIThreadRetargetableStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
EventSourceImpl::CheckListenerChain()
{
MOZ_ASSERT(NS_IsMainThread(), "Should be on the main thread!");
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// EventSource
////////////////////////////////////////////////////////////////////////////////
EventSource::EventSource(nsPIDOMWindowInner* aOwnerWindow,
bool aWithCredentials)
: DOMEventTargetHelper(aOwnerWindow)
, mWithCredentials(aWithCredentials)
, mIsMainThread(true)
, mKeepingAlive(false)
{
mImpl = new EventSourceImpl(this);
}
EventSource::~EventSource()
{
}
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<nsPIDOMWindowInner> ownerWindow =
do_QueryInterface(aGlobal.GetAsSupports());
MOZ_ASSERT(!NS_IsMainThread() || ownerWindow);
RefPtr<EventSource> eventSource =
new EventSource(ownerWindow, aEventSourceInitDict.mWithCredentials);
RefPtr<EventSourceImpl> eventSourceImp = eventSource->mImpl;
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;
}
eventSourceImp->Init(principal, aURL, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
eventSourceImp->InitChannelAndRequestEventSource();
return eventSource.forget();
}
// Worker side.
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
RefPtr<InitRunnable> initRunnable =
new InitRunnable(workerPrivate, eventSourceImp, 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.
if (!eventSourceImp->CreateWorkerRef(workerPrivate)) {
// The worker is already shutting down. Let's return an already closed
// object, but marked as Connecting.
eventSource->Close();
// EventSourceImpl must be released before returning the object, otherwise
// it will set EventSource to a CLOSED state in its DTOR.
eventSourceImp = nullptr;
eventSource->mReadyState = EventSourceImpl::CONNECTING;
return eventSource.forget();
}
// Let's connect to the server.
RefPtr<ConnectRunnable> connectRunnable =
new ConnectRunnable(workerPrivate, eventSourceImp);
connectRunnable->Dispatch(Canceling, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
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 (mImpl) {
mImpl->Close();
}
}
void
EventSource::UpdateMustKeepAlive()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mImpl);
if (mKeepingAlive) {
return;
}
mKeepingAlive = true;
mImpl->AddRefObject();
}
void
EventSource::UpdateDontKeepAlive()
{
// Here we could not have mImpl.
MOZ_ASSERT(NS_IsMainThread() == mIsMainThread);
if (mKeepingAlive) {
MOZ_ASSERT(mImpl);
mKeepingAlive = false;
mImpl->mEventSource = nullptr;
mImpl->ReleaseObject();
}
mImpl = nullptr;
}
//-----------------------------------------------------------------------------
// 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->mImpl) {
tmp->mImpl->Close();
MOZ_ASSERT(!tmp->mImpl);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
bool
EventSource::IsCertainlyAliveForCC() const
{
return mKeepingAlive;
}
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 dom
} // namespace mozilla
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