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Diffstat (limited to '')
| -rw-r--r-- | netwerk/ipc/ProxyAutoConfigChild.cpp | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/netwerk/ipc/ProxyAutoConfigChild.cpp b/netwerk/ipc/ProxyAutoConfigChild.cpp new file mode 100644 index 0000000000..8371b642de --- /dev/null +++ b/netwerk/ipc/ProxyAutoConfigChild.cpp @@ -0,0 +1,225 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* 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 "ProxyAutoConfigChild.h" + +#include "mozilla/ipc/Endpoint.h" +#include "mozilla/net/SocketProcessChild.h" +#include "mozilla/SpinEventLoopUntil.h" +#include "nsIObserver.h" +#include "nsIObserverService.h" +#include "nsThreadUtils.h" +#include "ProxyAutoConfig.h" + +namespace mozilla::net { + +static bool sThreadLocalSetup = false; +static uint32_t sThreadLocalIndex = 0xdeadbeef; +StaticRefPtr<nsIThread> ProxyAutoConfigChild::sPACThread; +bool ProxyAutoConfigChild::sShutdownObserverRegistered = false; +static StaticRefPtr<ProxyAutoConfigChild> sActor; + +namespace { + +class ShutdownObserver final : public nsIObserver { + public: + ShutdownObserver() = default; + + NS_DECL_ISUPPORTS + NS_DECL_NSIOBSERVER + + private: + ~ShutdownObserver() = default; +}; + +NS_IMPL_ISUPPORTS(ShutdownObserver, nsIObserver) + +NS_IMETHODIMP +ShutdownObserver::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + ProxyAutoConfigChild::ShutdownPACThread(); + return NS_OK; +} + +} // namespace + +// static +void ProxyAutoConfigChild::BindProxyAutoConfigChild( + RefPtr<ProxyAutoConfigChild>&& aActor, + Endpoint<PProxyAutoConfigChild>&& aEndpoint) { + // We only allow one ProxyAutoConfigChild at a time, so we need to + // wait until the old one to be destroyed. + if (sActor) { + NS_DispatchToCurrentThread(NS_NewRunnableFunction( + "BindProxyAutoConfigChild", + [actor = std::move(aActor), endpoint = std::move(aEndpoint)]() mutable { + ProxyAutoConfigChild::BindProxyAutoConfigChild(std::move(actor), + std::move(endpoint)); + })); + return; + } + + if (aEndpoint.Bind(aActor)) { + sActor = aActor; + } +} + +// static +bool ProxyAutoConfigChild::Create(Endpoint<PProxyAutoConfigChild>&& aEndpoint) { + if (!sPACThread && !CreatePACThread()) { + NS_WARNING("Failed to create pac thread!"); + return false; + } + + if (!sShutdownObserverRegistered) { + nsCOMPtr<nsIObserverService> obs = services::GetObserverService(); + if (NS_WARN_IF(!obs)) { + return false; + } + nsCOMPtr<nsIObserver> observer = new ShutdownObserver(); + nsresult rv = obs->AddObserver(observer, "xpcom-shutdown-threads", false); + if (NS_WARN_IF(NS_FAILED(rv))) { + return false; + } + sShutdownObserverRegistered = true; + } + + RefPtr<ProxyAutoConfigChild> actor = new ProxyAutoConfigChild(); + if (NS_FAILED(sPACThread->Dispatch(NS_NewRunnableFunction( + "ProxyAutoConfigChild::ProxyAutoConfigChild", + [actor = std::move(actor), + endpoint = std::move(aEndpoint)]() mutable { + MOZ_ASSERT(endpoint.IsValid()); + ProxyAutoConfigChild::BindProxyAutoConfigChild(std::move(actor), + std::move(endpoint)); + })))) { + NS_WARNING("Failed to dispatch runnable!"); + return false; + } + + return true; +} + +// static +bool ProxyAutoConfigChild::CreatePACThread() { + MOZ_ASSERT(NS_IsMainThread()); + + if (SocketProcessChild::GetSingleton()->IsShuttingDown()) { + NS_WARNING("Trying to create pac thread after shutdown has already begun!"); + return false; + } + + nsCOMPtr<nsIThread> thread; + if (NS_FAILED(NS_NewNamedThread("ProxyResolution", getter_AddRefs(thread)))) { + NS_WARNING("NS_NewNamedThread failed!"); + return false; + } + + sPACThread = thread.forget(); + return true; +} + +// static +void ProxyAutoConfigChild::ShutdownPACThread() { + MOZ_ASSERT(NS_IsMainThread()); + + if (sPACThread) { + // Wait until all actos are released. + SpinEventLoopUntil("ProxyAutoConfigChild::ShutdownPACThread"_ns, + [&]() { return !sActor; }); + + nsCOMPtr<nsIThread> thread = sPACThread.get(); + sPACThread = nullptr; + MOZ_ALWAYS_SUCCEEDS(thread->Shutdown()); + } +} + +ProxyAutoConfigChild::ProxyAutoConfigChild() + : mPAC(MakeUnique<ProxyAutoConfig>()) { + if (!sThreadLocalSetup) { + sThreadLocalSetup = true; + PR_NewThreadPrivateIndex(&sThreadLocalIndex, nullptr); + } + + mPAC->SetThreadLocalIndex(sThreadLocalIndex); +} + +ProxyAutoConfigChild::~ProxyAutoConfigChild() = default; + +mozilla::ipc::IPCResult ProxyAutoConfigChild::RecvConfigurePAC( + const nsACString& aPACURI, const nsACString& aPACScriptData, + const bool& aIncludePath, const uint32_t& aExtraHeapSize) { + mPAC->ConfigurePAC(aPACURI, aPACScriptData, aIncludePath, aExtraHeapSize, + GetMainThreadSerialEventTarget()); + mPACLoaded = true; + NS_DispatchToCurrentThread( + NewRunnableMethod("ProxyAutoConfigChild::ProcessPendingQ", this, + &ProxyAutoConfigChild::ProcessPendingQ)); + return IPC_OK(); +} + +void ProxyAutoConfigChild::PendingQuery::Resolve(nsresult aStatus, + const nsACString& aResult) { + mResolver(Tuple<const nsresult&, const nsACString&>(aStatus, aResult)); +} + +mozilla::ipc::IPCResult ProxyAutoConfigChild::RecvGetProxyForURI( + const nsACString& aTestURI, const nsACString& aTestHost, + GetProxyForURIResolver&& aResolver) { + mPendingQ.insertBack( + new PendingQuery(aTestURI, aTestHost, std::move(aResolver))); + ProcessPendingQ(); + return IPC_OK(); +} + +void ProxyAutoConfigChild::ProcessPendingQ() { + while (ProcessPending()) { + ; + } + + if (mShutdown) { + mPAC->Shutdown(); + } else { + // do GC while the thread has nothing pending + mPAC->GC(); + } +} + +bool ProxyAutoConfigChild::ProcessPending() { + if (mPendingQ.isEmpty()) { + return false; + } + + if (mInProgress || !mPACLoaded) { + return false; + } + + if (mShutdown) { + return true; + } + + mInProgress = true; + RefPtr<PendingQuery> query = mPendingQ.popFirst(); + nsCString result; + nsresult rv = mPAC->GetProxyForURI(query->URI(), query->Host(), result); + query->Resolve(rv, result); + mInProgress = false; + return true; +} + +void ProxyAutoConfigChild::ActorDestroy(ActorDestroyReason aWhy) { + mPendingQ.clear(); + mShutdown = true; + mPAC->Shutdown(); + + // To avoid racing with the main thread, we need to dispatch + // ProxyAutoConfigChild::Destroy again. + MOZ_ALWAYS_SUCCEEDS(NS_DispatchToCurrentThread(NewNonOwningRunnableMethod( + "ProxyAutoConfigChild::Destroy", this, &ProxyAutoConfigChild::Destroy))); +} + +void ProxyAutoConfigChild::Destroy() { sActor = nullptr; } + +} // namespace mozilla::net |