summaryrefslogtreecommitdiffstats
path: root/netwerk/socket/nsNamedPipeService.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'netwerk/socket/nsNamedPipeService.cpp')
-rw-r--r--netwerk/socket/nsNamedPipeService.cpp319
1 files changed, 319 insertions, 0 deletions
diff --git a/netwerk/socket/nsNamedPipeService.cpp b/netwerk/socket/nsNamedPipeService.cpp
new file mode 100644
index 0000000000..a713a34c1d
--- /dev/null
+++ b/netwerk/socket/nsNamedPipeService.cpp
@@ -0,0 +1,319 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/Services.h"
+#include "nsCOMPtr.h"
+#include "nsIObserverService.h"
+#include "nsNamedPipeService.h"
+#include "nsNetCID.h"
+#include "nsThreadUtils.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/Logging.h"
+
+namespace mozilla {
+namespace net {
+
+static mozilla::LazyLogModule gNamedPipeServiceLog("NamedPipeWin");
+#define LOG_NPS_DEBUG(...) \
+ MOZ_LOG(gNamedPipeServiceLog, mozilla::LogLevel::Debug, (__VA_ARGS__))
+#define LOG_NPS_ERROR(...) \
+ MOZ_LOG(gNamedPipeServiceLog, mozilla::LogLevel::Error, (__VA_ARGS__))
+
+StaticRefPtr<NamedPipeService> NamedPipeService::gSingleton;
+
+NS_IMPL_ISUPPORTS(NamedPipeService, nsINamedPipeService, nsIObserver,
+ nsIRunnable)
+
+NamedPipeService::NamedPipeService()
+ : mIocp(nullptr), mIsShutdown(false), mLock("NamedPipeServiceLock") {}
+
+nsresult NamedPipeService::Init() {
+ MOZ_ASSERT(!mIsShutdown);
+
+ nsresult rv;
+
+ // nsIObserverService must be accessed in main thread.
+ // register shutdown event to stop NamedPipeSrv thread.
+ nsCOMPtr<nsIObserver> self(this);
+ nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+ "NamedPipeService::Init", [self = std::move(self)]() -> void {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ nsCOMPtr<nsIObserverService> svc =
+ mozilla::services::GetObserverService();
+
+ if (NS_WARN_IF(!svc)) {
+ return;
+ }
+
+ if (NS_WARN_IF(NS_FAILED(svc->AddObserver(
+ self, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false)))) {
+ return;
+ }
+ });
+
+ if (NS_IsMainThread()) {
+ rv = r->Run();
+ } else {
+ rv = NS_DispatchToMainThread(r);
+ }
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ mIocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, nullptr, 0, 1);
+ if (NS_WARN_IF(!mIocp || mIocp == INVALID_HANDLE_VALUE)) {
+ Shutdown();
+ return NS_ERROR_FAILURE;
+ }
+
+ rv = NS_NewNamedThread("NamedPipeSrv", getter_AddRefs(mThread));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ Shutdown();
+ return rv;
+ }
+
+ return NS_OK;
+}
+
+// static
+already_AddRefed<nsINamedPipeService> NamedPipeService::GetOrCreate() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ RefPtr<NamedPipeService> inst;
+ if (gSingleton) {
+ inst = gSingleton;
+ } else {
+ inst = new NamedPipeService();
+ nsresult rv = inst->Init();
+ NS_ENSURE_SUCCESS(rv, nullptr);
+ gSingleton = inst;
+ ClearOnShutdown(&gSingleton);
+ }
+
+ return inst.forget();
+}
+
+void NamedPipeService::Shutdown() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ // remove observer
+ nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+ if (obs) {
+ obs->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
+ }
+
+ // stop thread
+ if (mThread && !mIsShutdown) {
+ mIsShutdown = true;
+
+ // invoke ERROR_ABANDONED_WAIT_0 to |GetQueuedCompletionStatus|
+ CloseHandle(mIocp);
+ mIocp = nullptr;
+
+ mThread->Shutdown();
+ }
+
+ // close I/O Completion Port
+ if (mIocp && mIocp != INVALID_HANDLE_VALUE) {
+ CloseHandle(mIocp);
+ mIocp = nullptr;
+ }
+}
+
+void NamedPipeService::RemoveRetiredObjects() {
+ MOZ_ASSERT(NS_GetCurrentThread() == mThread);
+ mLock.AssertCurrentThreadOwns();
+
+ if (!mRetiredHandles.IsEmpty()) {
+ for (auto& handle : mRetiredHandles) {
+ CloseHandle(handle);
+ }
+ mRetiredHandles.Clear();
+ }
+
+ mRetiredObservers.Clear();
+}
+
+/**
+ * Implement nsINamedPipeService
+ */
+
+NS_IMETHODIMP
+NamedPipeService::AddDataObserver(void* aHandle,
+ nsINamedPipeDataObserver* aObserver) {
+ if (!aHandle || aHandle == INVALID_HANDLE_VALUE || !aObserver) {
+ return NS_ERROR_ILLEGAL_VALUE;
+ }
+
+ nsresult rv;
+
+ HANDLE h = CreateIoCompletionPort(aHandle, mIocp,
+ reinterpret_cast<ULONG_PTR>(aObserver), 1);
+ if (NS_WARN_IF(!h)) {
+ LOG_NPS_ERROR("CreateIoCompletionPort error (%lu)", GetLastError());
+ return NS_ERROR_FAILURE;
+ }
+ if (NS_WARN_IF(h != mIocp)) {
+ LOG_NPS_ERROR(
+ "CreateIoCompletionPort got unexpected value %p (should be %p)", h,
+ mIocp);
+ CloseHandle(h);
+ return NS_ERROR_FAILURE;
+ }
+
+ {
+ MutexAutoLock lock(mLock);
+ MOZ_ASSERT(!mObservers.Contains(aObserver));
+
+ mObservers.AppendElement(aObserver);
+
+ // start event loop
+ if (mObservers.Length() == 1) {
+ rv = mThread->Dispatch(this, NS_DISPATCH_NORMAL);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ LOG_NPS_ERROR("Dispatch to thread failed (%08x)", uint32_t(rv));
+ mObservers.Clear();
+ return rv;
+ }
+ }
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+NamedPipeService::RemoveDataObserver(void* aHandle,
+ nsINamedPipeDataObserver* aObserver) {
+ MutexAutoLock lock(mLock);
+ mObservers.RemoveElement(aObserver);
+
+ mRetiredHandles.AppendElement(aHandle);
+ mRetiredObservers.AppendElement(aObserver);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+NamedPipeService::IsOnCurrentThread(bool* aRetVal) {
+ MOZ_ASSERT(mThread);
+ MOZ_ASSERT(aRetVal);
+
+ if (!mThread) {
+ *aRetVal = false;
+ return NS_OK;
+ }
+
+ return mThread->IsOnCurrentThread(aRetVal);
+}
+
+/**
+ * Implement nsIObserver
+ */
+
+NS_IMETHODIMP
+NamedPipeService::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aData) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (!strcmp(NS_XPCOM_SHUTDOWN_OBSERVER_ID, aTopic)) {
+ Shutdown();
+ }
+
+ return NS_OK;
+}
+
+/**
+ * Implement nsIRunnable
+ */
+
+NS_IMETHODIMP
+NamedPipeService::Run() {
+ MOZ_ASSERT(NS_GetCurrentThread() == mThread);
+ MOZ_ASSERT(mIocp && mIocp != INVALID_HANDLE_VALUE);
+
+ while (!mIsShutdown) {
+ {
+ MutexAutoLock lock(mLock);
+ if (mObservers.IsEmpty()) {
+ LOG_NPS_DEBUG("no observer, stop loop");
+ break;
+ }
+
+ RemoveRetiredObjects();
+ }
+
+ DWORD bytesTransferred = 0;
+ ULONG_PTR key = 0;
+ LPOVERLAPPED overlapped = nullptr;
+ BOOL success =
+ GetQueuedCompletionStatus(mIocp, &bytesTransferred, &key, &overlapped,
+ 1000); // timeout, 1s
+ auto err = GetLastError();
+ if (!success) {
+ if (err == WAIT_TIMEOUT) {
+ continue;
+ } else if (err == ERROR_ABANDONED_WAIT_0) { // mIocp was closed
+ break;
+ } else if (!overlapped) {
+ /**
+ * Did not dequeue a completion packet from the completion port, and
+ * bytesTransferred/key are meaningless.
+ * See remarks of |GetQueuedCompletionStatus| API.
+ */
+
+ LOG_NPS_ERROR("invalid overlapped (%lu)", err);
+ continue;
+ }
+
+ MOZ_ASSERT(key);
+ }
+
+ /**
+ * Windows doesn't provide a method to remove created I/O Completion Port,
+ * all we can do is just close the handle we monitored before.
+ * In some cases, there's race condition that the monitored handle has an
+ * I/O status after the observer is being removed and destroyed.
+ * To avoid changing the ref-count of a dangling pointer, don't use nsCOMPtr
+ * here.
+ */
+ nsINamedPipeDataObserver* target =
+ reinterpret_cast<nsINamedPipeDataObserver*>(key);
+
+ nsCOMPtr<nsINamedPipeDataObserver> obs;
+ {
+ MutexAutoLock lock(mLock);
+
+ auto idx = mObservers.IndexOf(target);
+ if (idx == decltype(mObservers)::NoIndex) {
+ LOG_NPS_ERROR("observer %p not found", target);
+ continue;
+ }
+ obs = target;
+ }
+
+ MOZ_ASSERT(obs.get());
+
+ if (success) {
+ LOG_NPS_DEBUG("OnDataAvailable: obs=%p, bytes=%lu", obs.get(),
+ bytesTransferred);
+ obs->OnDataAvailable(bytesTransferred, overlapped);
+ } else {
+ LOG_NPS_ERROR("GetQueuedCompletionStatus %p failed, error=%lu", obs.get(),
+ err);
+ obs->OnError(err, overlapped);
+ }
+ }
+
+ {
+ MutexAutoLock lock(mLock);
+ RemoveRetiredObjects();
+ }
+
+ return NS_OK;
+}
+
+} // namespace net
+} // namespace mozilla