1 files changed, 408 insertions, 0 deletions
diff --git a/netwerk/base/nsStreamTransportService.cpp b/netwerk/base/nsStreamTransportService.cpp
new file mode 100644
index 0000000000..8a528df2d6
--- /dev/null
+++ b/netwerk/base/nsStreamTransportService.cpp
@@ -0,0 +1,408 @@
+/* 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 "nsStreamTransportService.h"
+#include "nsXPCOMCIDInternal.h"
+#include "nsNetSegmentUtils.h"
+#include "nsTransportUtils.h"
+#include "nsStreamUtils.h"
+#include "nsError.h"
+#include "nsNetCID.h"
+
+#include "nsIAsyncInputStream.h"
+#include "nsIAsyncOutputStream.h"
+#include "nsIPipe.h"
+#include "nsITransport.h"
+#include "nsIObserverService.h"
+#include "nsThreadPool.h"
+#include "mozilla/Services.h"
+
+namespace mozilla {
+namespace net {
+
+//-----------------------------------------------------------------------------
+// nsInputStreamTransport
+//
+// Implements nsIInputStream as a wrapper around the real input stream.  This
+// allows the transport to support seeking, range-limiting, progress reporting,
+// and close-when-done semantics while utilizing NS_AsyncCopy.
+//-----------------------------------------------------------------------------
+
+class nsInputStreamTransport : public nsITransport,
+                               public nsIAsyncInputStream,
+                               public nsIInputStreamCallback {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSITRANSPORT
+  NS_DECL_NSIINPUTSTREAM
+  NS_DECL_NSIASYNCINPUTSTREAM
+  NS_DECL_NSIINPUTSTREAMCALLBACK
+
+  nsInputStreamTransport(nsIInputStream* source, bool closeWhenDone)
+      : mMutex("nsInputStreamTransport::mMutex"),
+        mSource(source),
+        mOffset(0),
+        mCloseWhenDone(closeWhenDone),
+        mInProgress(false) {
+    mAsyncSource = do_QueryInterface(mSource);
+  }
+
+ private:
+  virtual ~nsInputStreamTransport() = default;
+
+  Mutex mMutex;
+
+  // This value is protected by mutex.
+  nsCOMPtr<nsIInputStreamCallback> mAsyncWaitCallback;
+
+  nsCOMPtr<nsIAsyncInputStream> mPipeIn;
+
+  // while the copy is active, these members may only be accessed from the
+  // nsIInputStream implementation.
+  nsCOMPtr<nsITransportEventSink> mEventSink;
+  nsCOMPtr<nsIInputStream> mSource;
+
+  // It can be null.
+  nsCOMPtr<nsIAsyncInputStream> mAsyncSource;
+
+  int64_t mOffset;
+  const bool mCloseWhenDone;
+
+  // this variable serves as a lock to prevent the state of the transport
+  // from being modified once the copy is in progress.
+  bool mInProgress;
+};
+
+NS_IMPL_ADDREF(nsInputStreamTransport);
+NS_IMPL_RELEASE(nsInputStreamTransport);
+
+NS_INTERFACE_MAP_BEGIN(nsInputStreamTransport)
+  NS_INTERFACE_MAP_ENTRY(nsITransport)
+  NS_INTERFACE_MAP_ENTRY(nsIInputStream)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIAsyncInputStream, !!mAsyncSource)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIInputStreamCallback, !!mAsyncSource)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsITransport)
+NS_INTERFACE_MAP_END
+
+/** nsITransport **/
+
+NS_IMETHODIMP
+nsInputStreamTransport::OpenInputStream(uint32_t flags, uint32_t segsize,
+                                        uint32_t segcount,
+                                        nsIInputStream** result) {
+  NS_ENSURE_TRUE(!mInProgress, NS_ERROR_IN_PROGRESS);
+
+  nsresult rv;
+  nsCOMPtr<nsIEventTarget> target =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
+  if (NS_FAILED(rv)) return rv;
+
+  // XXX if the caller requests an unbuffered stream, then perhaps
+  //     we'd want to simply return mSource; however, then we would
+  //     not be reading mSource on a background thread.  is this ok?
+
+  bool nonblocking = !(flags & OPEN_BLOCKING);
+
+  net_ResolveSegmentParams(segsize, segcount);
+
+  nsCOMPtr<nsIAsyncOutputStream> pipeOut;
+  rv = NS_NewPipe2(getter_AddRefs(mPipeIn), getter_AddRefs(pipeOut),
+                   nonblocking, true, segsize, segcount);
+  if (NS_FAILED(rv)) return rv;
+
+  mInProgress = true;
+
+  // startup async copy process...
+  rv = NS_AsyncCopy(this, pipeOut, target, NS_ASYNCCOPY_VIA_WRITESEGMENTS,
+                    segsize);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  *result = do_AddRef(mPipeIn).take();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::OpenOutputStream(uint32_t flags, uint32_t segsize,
+                                         uint32_t segcount,
+                                         nsIOutputStream** result) {
+  // this transport only supports reading!
+  MOZ_ASSERT_UNREACHABLE("nsInputStreamTransport::OpenOutputStream");
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::Close(nsresult reason) {
+  if (NS_SUCCEEDED(reason)) reason = NS_BASE_STREAM_CLOSED;
+
+  return mPipeIn->CloseWithStatus(reason);
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::SetEventSink(nsITransportEventSink* sink,
+                                     nsIEventTarget* target) {
+  NS_ENSURE_TRUE(!mInProgress, NS_ERROR_IN_PROGRESS);
+
+  if (target)
+    return net_NewTransportEventSinkProxy(getter_AddRefs(mEventSink), sink,
+                                          target);
+
+  mEventSink = sink;
+  return NS_OK;
+}
+
+/** nsIInputStream **/
+
+NS_IMETHODIMP
+nsInputStreamTransport::Close() {
+  if (mCloseWhenDone) mSource->Close();
+
+  // make additional reads return early...
+  mOffset = 0;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::Available(uint64_t* result) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::Read(char* buf, uint32_t count, uint32_t* result) {
+  nsresult rv = mSource->Read(buf, count, result);
+
+  if (NS_SUCCEEDED(rv)) {
+    mOffset += *result;
+    if (mEventSink)
+      mEventSink->OnTransportStatus(this, NS_NET_STATUS_READING, mOffset, -1);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::ReadSegments(nsWriteSegmentFun writer, void* closure,
+                                     uint32_t count, uint32_t* result) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsInputStreamTransport::IsNonBlocking(bool* result) {
+  *result = false;
+  return NS_OK;
+}
+
+// nsIAsyncInputStream interface
+
+NS_IMETHODIMP
+nsInputStreamTransport::CloseWithStatus(nsresult aStatus) { return Close(); }
+
+NS_IMETHODIMP
+nsInputStreamTransport::AsyncWait(nsIInputStreamCallback* aCallback,
+                                  uint32_t aFlags, uint32_t aRequestedCount,
+                                  nsIEventTarget* aEventTarget) {
+  NS_ENSURE_STATE(!!mAsyncSource);
+
+  nsCOMPtr<nsIInputStreamCallback> callback = aCallback ? this : nullptr;
+
+  {
+    MutexAutoLock lock(mMutex);
+
+    if (mAsyncWaitCallback && aCallback) {
+      return NS_ERROR_FAILURE;
+    }
+
+    mAsyncWaitCallback = aCallback;
+  }
+
+  return mAsyncSource->AsyncWait(callback, aFlags, aRequestedCount,
+                                 aEventTarget);
+}
+
+// nsIInputStreamCallback
+
+NS_IMETHODIMP
+nsInputStreamTransport::OnInputStreamReady(nsIAsyncInputStream* aStream) {
+  nsCOMPtr<nsIInputStreamCallback> callback;
+  {
+    MutexAutoLock lock(mMutex);
+
+    // We have been canceled in the meanwhile.
+    if (!mAsyncWaitCallback) {
+      return NS_OK;
+    }
+
+    callback.swap(mAsyncWaitCallback);
+  }
+
+  MOZ_ASSERT(callback);
+  return callback->OnInputStreamReady(this);
+}
+
+//-----------------------------------------------------------------------------
+// nsStreamTransportService
+//-----------------------------------------------------------------------------
+
+nsStreamTransportService::~nsStreamTransportService() {
+  NS_ASSERTION(!mPool, "thread pool wasn't shutdown");
+}
+
+nsresult nsStreamTransportService::Init() {
+  mPool = new nsThreadPool();
+
+  // Configure the pool
+  mPool->SetName("StreamTrans"_ns);
+  mPool->SetThreadLimit(25);
+  mPool->SetIdleThreadLimit(5);
+  mPool->SetIdleThreadTimeoutRegressive(true);
+  mPool->SetIdleThreadTimeout(PR_SecondsToInterval(30));
+
+  nsCOMPtr<nsIObserverService> obsSvc = mozilla::services::GetObserverService();
+  if (obsSvc) obsSvc->AddObserver(this, "xpcom-shutdown-threads", false);
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsStreamTransportService, nsIStreamTransportService,
+                  nsIEventTarget, nsIObserver)
+
+NS_IMETHODIMP
+nsStreamTransportService::DispatchFromScript(nsIRunnable* task,
+                                             uint32_t flags) {
+  nsCOMPtr<nsIRunnable> event(task);
+  return Dispatch(event.forget(), flags);
+}
+
+NS_IMETHODIMP
+nsStreamTransportService::Dispatch(already_AddRefed<nsIRunnable> task,
+                                   uint32_t flags) {
+  nsCOMPtr<nsIRunnable> event(task);  // so it gets released on failure paths
+  nsCOMPtr<nsIThreadPool> pool;
+  {
+    mozilla::MutexAutoLock lock(mShutdownLock);
+    if (mIsShutdown) {
+      return NS_ERROR_NOT_INITIALIZED;
+    }
+    pool = mPool;
+  }
+  NS_ENSURE_TRUE(pool, NS_ERROR_NOT_INITIALIZED);
+  return pool->Dispatch(event.forget(), flags);
+}
+
+NS_IMETHODIMP
+nsStreamTransportService::DelayedDispatch(already_AddRefed<nsIRunnable>,
+                                          uint32_t) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP_(bool)
+nsStreamTransportService::IsOnCurrentThreadInfallible() {
+  nsCOMPtr<nsIThreadPool> pool;
+  {
+    mozilla::MutexAutoLock lock(mShutdownLock);
+    pool = mPool;
+  }
+  if (!pool) {
+    return false;
+  }
+  return pool->IsOnCurrentThread();
+}
+
+NS_IMETHODIMP
+nsStreamTransportService::IsOnCurrentThread(bool* result) {
+  nsCOMPtr<nsIThreadPool> pool;
+  {
+    mozilla::MutexAutoLock lock(mShutdownLock);
+    if (mIsShutdown) {
+      return NS_ERROR_NOT_INITIALIZED;
+    }
+    pool = mPool;
+  }
+  NS_ENSURE_TRUE(pool, NS_ERROR_NOT_INITIALIZED);
+  return pool->IsOnCurrentThread(result);
+}
+
+NS_IMETHODIMP
+nsStreamTransportService::CreateInputTransport(nsIInputStream* stream,
+                                               bool closeWhenDone,
+                                               nsITransport** result) {
+  RefPtr<nsInputStreamTransport> trans =
+      new nsInputStreamTransport(stream, closeWhenDone);
+  trans.forget(result);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStreamTransportService::Observe(nsISupports* subject, const char* topic,
+                                  const char16_t* data) {
+  NS_ASSERTION(strcmp(topic, "xpcom-shutdown-threads") == 0, "oops");
+
+  {
+    mozilla::MutexAutoLock lock(mShutdownLock);
+    mIsShutdown = true;
+  }
+
+  if (mPool) {
+    mPool->Shutdown();
+    mPool = nullptr;
+  }
+  return NS_OK;
+}
+
+class AvailableEvent final : public Runnable {
+ public:
+  AvailableEvent(nsIInputStream* stream, nsIInputAvailableCallback* callback)
+      : Runnable("net::AvailableEvent"),
+        mStream(stream),
+        mCallback(callback),
+        mDoingCallback(false),
+        mSize(0),
+        mResultForCallback(NS_OK) {
+    mCallbackTarget = GetCurrentEventTarget();
+  }
+
+  NS_IMETHOD Run() override {
+    if (mDoingCallback) {
+      // pong
+      mCallback->OnInputAvailableComplete(mSize, mResultForCallback);
+      mCallback = nullptr;
+    } else {
+      // ping
+      mResultForCallback = mStream->Available(&mSize);
+      mStream = nullptr;
+      mDoingCallback = true;
+
+      nsCOMPtr<nsIRunnable> event(this);  // overly cute
+      mCallbackTarget->Dispatch(event.forget(), NS_DISPATCH_NORMAL);
+      mCallbackTarget = nullptr;
+    }
+    return NS_OK;
+  }
+
+ private:
+  virtual ~AvailableEvent() = default;
+
+  nsCOMPtr<nsIInputStream> mStream;
+  nsCOMPtr<nsIInputAvailableCallback> mCallback;
+  nsCOMPtr<nsIEventTarget> mCallbackTarget;
+  bool mDoingCallback;
+  uint64_t mSize;
+  nsresult mResultForCallback;
+};
+
+NS_IMETHODIMP
+nsStreamTransportService::InputAvailable(nsIInputStream* stream,
+                                         nsIInputAvailableCallback* callback) {
+  nsCOMPtr<nsIThreadPool> pool;
+  {
+    mozilla::MutexAutoLock lock(mShutdownLock);
+    if (mIsShutdown) {
+      return NS_ERROR_NOT_INITIALIZED;
+    }
+    pool = mPool;
+  }
+  nsCOMPtr<nsIRunnable> event = new AvailableEvent(stream, callback);
+  return pool->Dispatch(event.forget(), NS_DISPATCH_NORMAL);
+}
+
+}  // namespace net
+}  // namespace mozilla