1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
|
/* -*- 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/ipc/SendStream.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/nsIContentChild.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/workers/bindings/WorkerHolder.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "nsIAsyncInputStream.h"
#include "nsICancelableRunnable.h"
#include "nsIRunnable.h"
#include "nsIThread.h"
#include "nsStreamUtils.h"
namespace mozilla {
namespace ipc {
using mozilla::dom::nsIContentChild;
using mozilla::dom::workers::Canceling;
using mozilla::dom::workers::GetCurrentThreadWorkerPrivate;
using mozilla::dom::workers::Status;
using mozilla::dom::workers::WorkerHolder;
using mozilla::dom::workers::WorkerPrivate;
namespace {
class SendStreamChildImpl final : public SendStreamChild
, public WorkerHolder
{
public:
explicit SendStreamChildImpl(nsIAsyncInputStream* aStream);
~SendStreamChildImpl();
void Start() override;
void StartDestroy() override;
bool
AddAsWorkerHolder(dom::workers::WorkerPrivate* aWorkerPrivate);
private:
class Callback;
// PSendStreamChild methods
virtual void
ActorDestroy(ActorDestroyReason aReason) override;
virtual bool
RecvRequestClose(const nsresult& aRv) override;
// WorkerHolder methods
virtual bool
Notify(Status aStatus) override;
void DoRead();
void Wait();
void OnStreamReady(Callback* aCallback);
void OnEnd(nsresult aRv);
nsCOMPtr<nsIAsyncInputStream> mStream;
RefPtr<Callback> mCallback;
WorkerPrivate* mWorkerPrivate;
bool mClosed;
NS_DECL_OWNINGTHREAD
};
class SendStreamChildImpl::Callback final : public nsIInputStreamCallback
, public nsIRunnable
, public nsICancelableRunnable
{
public:
explicit Callback(SendStreamChildImpl* aActor)
: mActor(aActor)
, mOwningThread(NS_GetCurrentThread())
{
MOZ_ASSERT(mActor);
}
NS_IMETHOD
OnInputStreamReady(nsIAsyncInputStream* aStream) override
{
// any thread
if (mOwningThread == NS_GetCurrentThread()) {
return Run();
}
// If this fails, then it means the owning thread is a Worker that has
// been shutdown. Its ok to lose the event in this case because the
// SendStreamChild listens for this event through the WorkerHolder.
nsresult rv = mOwningThread->Dispatch(this, nsIThread::DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch stream readable event to owning thread");
}
return NS_OK;
}
NS_IMETHOD
Run() override
{
MOZ_ASSERT(mOwningThread == NS_GetCurrentThread());
if (mActor) {
mActor->OnStreamReady(this);
}
return NS_OK;
}
nsresult
Cancel() override
{
// Cancel() gets called when the Worker thread is being shutdown. We have
// nothing to do here because SendStreamChild handles this case via
// the WorkerHolder.
return NS_OK;
}
void
ClearActor()
{
MOZ_ASSERT(mOwningThread == NS_GetCurrentThread());
MOZ_ASSERT(mActor);
mActor = nullptr;
}
private:
~Callback()
{
// called on any thread
// ClearActor() should be called before the Callback is destroyed
MOZ_ASSERT(!mActor);
}
SendStreamChildImpl* mActor;
nsCOMPtr<nsIThread> mOwningThread;
NS_DECL_THREADSAFE_ISUPPORTS
};
NS_IMPL_ISUPPORTS(SendStreamChildImpl::Callback, nsIInputStreamCallback,
nsIRunnable,
nsICancelableRunnable);
SendStreamChildImpl::SendStreamChildImpl(nsIAsyncInputStream* aStream)
: mStream(aStream)
, mWorkerPrivate(nullptr)
, mClosed(false)
{
MOZ_ASSERT(mStream);
}
SendStreamChildImpl::~SendStreamChildImpl()
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT(mClosed);
MOZ_ASSERT(!mCallback);
MOZ_ASSERT(!mWorkerPrivate);
}
void
SendStreamChildImpl::Start()
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT_IF(!NS_IsMainThread(), mWorkerPrivate);
DoRead();
}
void
SendStreamChildImpl::StartDestroy()
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
OnEnd(NS_ERROR_ABORT);
}
bool
SendStreamChildImpl::AddAsWorkerHolder(WorkerPrivate* aWorkerPrivate)
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT(aWorkerPrivate);
bool result = HoldWorker(aWorkerPrivate, Canceling);
if (result) {
mWorkerPrivate = aWorkerPrivate;
}
return result;
}
void
SendStreamChildImpl::ActorDestroy(ActorDestroyReason aReason)
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
// If the parent side runs into a problem it will ask the child to
// close the connection via RequestClose(). Therefore OnEnd() should
// always run before the actor is destroyed.
MOZ_ASSERT(mClosed);
if (mCallback) {
mCallback->ClearActor();
mCallback = nullptr;
}
if (mWorkerPrivate) {
ReleaseWorker();
mWorkerPrivate = nullptr;
}
}
bool
SendStreamChildImpl::RecvRequestClose(const nsresult& aRv)
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
OnEnd(aRv);
return true;
}
bool
SendStreamChildImpl::Notify(Status aStatus)
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
// Keep the worker thread alive until the stream is finished.
return true;
}
void
SendStreamChildImpl::DoRead()
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT(!mClosed);
MOZ_ASSERT(!mCallback);
// The input stream (likely a pipe) probably uses a segment size of
// 4kb. If there is data already buffered it would be nice to aggregate
// multiple segments into a single IPC call. Conversely, don't send too
// too large of a buffer in a single call to avoid spiking memory.
static const uint64_t kMaxBytesPerMessage = 32 * 1024;
static_assert(kMaxBytesPerMessage <= static_cast<uint64_t>(UINT32_MAX),
"kMaxBytesPerMessage must cleanly cast to uint32_t");
while (true) {
// It should not be possible to transition to closed state without
// this loop terminating via a return.
MOZ_ASSERT(!mClosed);
// Use non-auto here as we're unlikely to hit stack storage with the
// sizes we are sending. Also, it would be nice to avoid another copy
// to the IPC layer which we avoid if we use COW strings. Unfortunately
// IPC does not seem to support passing dependent storage types.
nsCString buffer;
uint64_t available = 0;
nsresult rv = mStream->Available(&available);
if (NS_FAILED(rv)) {
OnEnd(rv);
return;
}
if (available == 0) {
Wait();
return;
}
uint32_t expectedBytes =
static_cast<uint32_t>(std::min(available, kMaxBytesPerMessage));
buffer.SetLength(expectedBytes);
uint32_t bytesRead = 0;
rv = mStream->Read(buffer.BeginWriting(), buffer.Length(), &bytesRead);
MOZ_ASSERT_IF(NS_FAILED(rv), bytesRead == 0);
buffer.SetLength(bytesRead);
// If we read any data from the stream, send it across.
if (!buffer.IsEmpty()) {
Unused << SendBuffer(buffer);
}
if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
Wait();
return;
}
// Any other error or zero-byte read indicates end-of-stream
if (NS_FAILED(rv) || buffer.IsEmpty()) {
OnEnd(rv);
return;
}
}
}
void
SendStreamChildImpl::Wait()
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT(!mClosed);
MOZ_ASSERT(!mCallback);
// Set mCallback immediately instead of waiting for success. Its possible
// AsyncWait() will callback synchronously.
mCallback = new Callback(this);
nsresult rv = mStream->AsyncWait(mCallback, 0, 0, nullptr);
if (NS_FAILED(rv)) {
OnEnd(rv);
return;
}
}
void
SendStreamChildImpl::OnStreamReady(Callback* aCallback)
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT(mCallback);
MOZ_ASSERT(aCallback == mCallback);
mCallback->ClearActor();
mCallback = nullptr;
DoRead();
}
void
SendStreamChildImpl::OnEnd(nsresult aRv)
{
NS_ASSERT_OWNINGTHREAD(SendStreamChild);
MOZ_ASSERT(aRv != NS_BASE_STREAM_WOULD_BLOCK);
if (mClosed) {
return;
}
mClosed = true;
mStream->CloseWithStatus(aRv);
if (aRv == NS_BASE_STREAM_CLOSED) {
aRv = NS_OK;
}
// This will trigger an ActorDestroy() from the parent side
Unused << SendClose(aRv);
}
bool
IsBlocking(nsIAsyncInputStream* aInputStream)
{
bool nonBlocking = false;
MOZ_ALWAYS_TRUE(NS_SUCCEEDED(aInputStream->IsNonBlocking(&nonBlocking)));
return !nonBlocking;
}
} // anonymous namespace
// static
SendStreamChild*
SendStreamChild::Create(nsIAsyncInputStream* aInputStream,
nsIContentChild* aManager)
{
MOZ_ASSERT(aInputStream);
MOZ_ASSERT(aManager);
// PContent can only be used on the main thread
MOZ_ASSERT(NS_IsMainThread());
// SendStreamChild reads in the current thread, so it is only supported
// on non-blocking, async channels
if (NS_WARN_IF(IsBlocking(aInputStream))) {
return nullptr;
}
SendStreamChild* actor = new SendStreamChildImpl(aInputStream);
aManager->SendPSendStreamConstructor(actor);
return actor;
}
// static
SendStreamChild*
SendStreamChild::Create(nsIAsyncInputStream* aInputStream,
PBackgroundChild* aManager)
{
MOZ_ASSERT(aInputStream);
MOZ_ASSERT(aManager);
// PBackground can be used on any thread, but we only support SendStream on
// main thread and Worker threads right now. This is due to the requirement
// that the thread be guaranteed to live long enough to receive messages
// sent from parent to child. We can enforce this guarantee with a feature
// on worker threads, but not other threads.
WorkerPrivate* workerPrivate = nullptr;
if (!NS_IsMainThread()) {
workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
}
// SendStreamChild reads in the current thread, so it is only supported
// on non-blocking, async channels
if (NS_WARN_IF(IsBlocking(aInputStream))) {
return nullptr;
}
SendStreamChildImpl* actor = new SendStreamChildImpl(aInputStream);
if (workerPrivate && !actor->AddAsWorkerHolder(workerPrivate)) {
delete actor;
return nullptr;
}
aManager->SendPSendStreamConstructor(actor);
return actor;
}
SendStreamChild::~SendStreamChild()
{
}
void
DeallocPSendStreamChild(PSendStreamChild* aActor)
{
delete aActor;
}
} // namespace ipc
} // namespace mozilla
|