#include "TestInterruptErrorCleanup.h"

#include "base/task.h"
#include "mozilla/CondVar.h"
#include "mozilla/Mutex.h"

#include "IPDLUnitTests.h"  // fail etc.
#include "IPDLUnitTestSubprocess.h"

using mozilla::CondVar;
using mozilla::Mutex;
using mozilla::MutexAutoLock;

namespace mozilla {
namespace _ipdltest {

//-----------------------------------------------------------------------------
// parent

namespace {

// NB: this test does its own shutdown, rather than going through
// QuitParent(), because it's testing degenerate edge cases

void DeleteSubprocess(Mutex* mutex, CondVar* cvar) {
  MutexAutoLock lock(*mutex);

  gSubprocess->Destroy();
  gSubprocess = nullptr;

  cvar->Notify();
}

void DeleteTheWorld() {
  delete static_cast<TestInterruptErrorCleanupParent*>(gParentActor);
  gParentActor = nullptr;

  // needs to be synchronous to avoid affecting event ordering on
  // the main thread
  Mutex mutex MOZ_UNANNOTATED("TestInterruptErrorCleanup.DeleteTheWorld.mutex");
  CondVar cvar(mutex, "TestInterruptErrorCleanup.DeleteTheWorld.cvar");

  MutexAutoLock lock(mutex);

  XRE_GetIOMessageLoop()->PostTask(
      NewRunnableFunction("DeleteSubprocess", DeleteSubprocess, &mutex, &cvar));

  cvar.Wait();
}

void Done() {
  static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
  nsCOMPtr<nsIAppShell> appShell(do_GetService(kAppShellCID));
  appShell->Exit();

  passed(__FILE__);
}

}  // namespace

TestInterruptErrorCleanupParent::TestInterruptErrorCleanupParent()
    : mGotProcessingError(false) {
  MOZ_COUNT_CTOR(TestInterruptErrorCleanupParent);
}

TestInterruptErrorCleanupParent::~TestInterruptErrorCleanupParent() {
  MOZ_COUNT_DTOR(TestInterruptErrorCleanupParent);
}

void TestInterruptErrorCleanupParent::Main() {
  // This test models the following sequence of events
  //
  // (1) Parent: Interrupt out-call
  // (2) Child: crash
  // --[Parent-only hereafter]--
  // (3) Interrupt out-call return false
  // (4) Close()
  // --[event loop]--
  // (5) delete parentActor
  // (6) delete childProcess
  // --[event loop]--
  // (7) Channel::OnError notification
  // --[event loop]--
  // (8) Done, quit
  //
  // See bug 535298 and friends; this seqeunce of events captures
  // three differnent potential errors
  //  - Close()-after-error (semantic error previously)
  //  - use-after-free of parentActor
  //  - use-after-free of channel
  //
  // Because of legacy constraints related to nsNPAPI* code, we need
  // to ensure that this sequence of events can occur without
  // errors/crashes.

  MessageLoop::current()->PostTask(
      NewRunnableFunction("DeleteTheWorld", DeleteTheWorld));

  // it's a failure if this *succeeds*
  if (CallError()) fail("expected an error!");

  if (!mGotProcessingError) fail("expected a ProcessingError() notification");

  // it's OK to Close() a channel after an error, because nsNPAPI*
  // wants to do this
  Close();

  // we know that this event *must* be after the MaybeError
  // notification enqueued by AsyncChannel, because that event is
  // enqueued within the same mutex that ends up signaling the
  // wakeup-on-error of |CallError()| above
  MessageLoop::current()->PostTask(NewRunnableFunction("Done", Done));
}

void TestInterruptErrorCleanupParent::ProcessingError(Result aCode,
                                                      const char* aReason) {
  if (aCode != MsgDropped) fail("unexpected processing error");
  mGotProcessingError = true;
}

//-----------------------------------------------------------------------------
// child

TestInterruptErrorCleanupChild::TestInterruptErrorCleanupChild() {
  MOZ_COUNT_CTOR(TestInterruptErrorCleanupChild);
}

TestInterruptErrorCleanupChild::~TestInterruptErrorCleanupChild() {
  MOZ_COUNT_DTOR(TestInterruptErrorCleanupChild);
}

mozilla::ipc::IPCResult TestInterruptErrorCleanupChild::AnswerError() {
  _exit(0);
  MOZ_CRASH("unreached");
}

}  // namespace _ipdltest
}  // namespace mozilla
