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/* 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 "nsCOMPtr.h"
#include "nsProxyRelease.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsXPCOM.h"
#include "nsXPCOMCID.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsWifiMonitor.h"
#include "nsWifiAccessPoint.h"
#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Services.h"
using namespace mozilla;
LazyLogModule gWifiMonitorLog("WifiMonitor");
NS_IMPL_ISUPPORTS(nsWifiMonitor, nsIRunnable, nsIObserver, nsIWifiMonitor)
nsWifiMonitor::nsWifiMonitor()
: mKeepGoing(true),
mThreadComplete(false),
mReentrantMonitor("nsWifiMonitor.mReentrantMonitor") {
nsCOMPtr<nsIObserverService> obsSvc = mozilla::services::GetObserverService();
if (obsSvc) obsSvc->AddObserver(this, "xpcom-shutdown", false);
LOG(("@@@@@ wifimonitor created\n"));
}
NS_IMETHODIMP
nsWifiMonitor::Observe(nsISupports* subject, const char* topic,
const char16_t* data) {
if (!strcmp(topic, "xpcom-shutdown")) {
LOG(("Shutting down\n"));
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
mKeepGoing = false;
mon.Notify();
mThread = nullptr;
}
return NS_OK;
}
NS_IMETHODIMP nsWifiMonitor::StartWatching(nsIWifiListener* aListener) {
LOG(("nsWifiMonitor::StartWatching %p thread %p listener %p\n", this,
mThread.get(), aListener));
MOZ_ASSERT(NS_IsMainThread());
if (!aListener) return NS_ERROR_NULL_POINTER;
if (!mKeepGoing) {
return NS_ERROR_NOT_AVAILABLE;
}
nsresult rv = NS_OK;
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
if (mThreadComplete) {
// generally there is just one thread for the lifetime of the service,
// but if DoScan returns with an error before shutdown (i.e. !mKeepGoing)
// then we will respawn the thread.
LOG(("nsWifiMonitor::StartWatching %p restarting thread\n", this));
mThreadComplete = false;
mThread = nullptr;
}
if (!mThread) {
rv = NS_NewNamedThread("Wifi Monitor", getter_AddRefs(mThread), this);
if (NS_FAILED(rv)) return rv;
}
mListeners.AppendElement(
nsWifiListener(new nsMainThreadPtrHolder<nsIWifiListener>(
"nsIWifiListener", aListener)));
// tell ourselves that we have a new watcher.
mon.Notify();
return NS_OK;
}
NS_IMETHODIMP nsWifiMonitor::StopWatching(nsIWifiListener* aListener) {
LOG(("nsWifiMonitor::StopWatching %p thread %p listener %p\n", this,
mThread.get(), aListener));
MOZ_ASSERT(NS_IsMainThread());
if (!aListener) return NS_ERROR_NULL_POINTER;
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
for (uint32_t i = 0; i < mListeners.Length(); i++) {
if (mListeners[i].mListener == aListener) {
mListeners.RemoveElementAt(i);
break;
}
}
return NS_OK;
}
typedef nsTArray<nsMainThreadPtrHandle<nsIWifiListener>> WifiListenerArray;
class nsPassErrorToWifiListeners final : public nsIRunnable {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIRUNNABLE
nsPassErrorToWifiListeners(UniquePtr<WifiListenerArray>&& aListeners,
nsresult aResult)
: mListeners(std::move(aListeners)), mResult(aResult) {}
private:
~nsPassErrorToWifiListeners() = default;
UniquePtr<WifiListenerArray> mListeners;
nsresult mResult;
};
NS_IMPL_ISUPPORTS(nsPassErrorToWifiListeners, nsIRunnable)
NS_IMETHODIMP nsPassErrorToWifiListeners::Run() {
LOG(("About to send error to the wifi listeners\n"));
for (size_t i = 0; i < mListeners->Length(); i++) {
(*mListeners)[i]->OnError(mResult);
}
return NS_OK;
}
NS_IMETHODIMP nsWifiMonitor::Run() {
LOG(("@@@@@ wifi monitor run called\n"));
nsresult rv = DoScan();
LOG(("@@@@@ wifi monitor run::doscan complete %" PRIx32 "\n",
static_cast<uint32_t>(rv)));
UniquePtr<WifiListenerArray> currentListeners;
bool doError = false;
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
if (mKeepGoing && NS_FAILED(rv)) {
doError = true;
currentListeners = MakeUnique<WifiListenerArray>(mListeners.Length());
for (uint32_t i = 0; i < mListeners.Length(); i++)
currentListeners->AppendElement(mListeners[i].mListener);
}
mThreadComplete = true;
}
if (doError) {
nsCOMPtr<nsIEventTarget> target = GetMainThreadEventTarget();
if (!target) return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIRunnable> runnable(
new nsPassErrorToWifiListeners(std::move(currentListeners), rv));
if (!runnable) return NS_ERROR_OUT_OF_MEMORY;
target->Dispatch(runnable, NS_DISPATCH_SYNC);
}
LOG(("@@@@@ wifi monitor run complete\n"));
return NS_OK;
}
class nsCallWifiListeners final : public nsIRunnable {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIRUNNABLE
nsCallWifiListeners(WifiListenerArray&& aListeners,
nsTArray<RefPtr<nsIWifiAccessPoint>>&& aAccessPoints)
: mListeners(std::move(aListeners)),
mAccessPoints(std::move(aAccessPoints)) {}
private:
~nsCallWifiListeners() = default;
const WifiListenerArray mListeners;
const nsTArray<RefPtr<nsIWifiAccessPoint>> mAccessPoints;
};
NS_IMPL_ISUPPORTS(nsCallWifiListeners, nsIRunnable)
NS_IMETHODIMP nsCallWifiListeners::Run() {
LOG(("About to send data to the wifi listeners\n"));
for (auto& listener : mListeners) {
listener->OnChange(mAccessPoints);
}
return NS_OK;
}
nsresult nsWifiMonitor::CallWifiListeners(
const nsCOMArray<nsWifiAccessPoint>& aAccessPoints,
bool aAccessPointsChanged) {
WifiListenerArray currentListeners;
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
currentListeners.SetCapacity(mListeners.Length());
for (auto& listener : mListeners) {
if (!listener.mHasSentData || aAccessPointsChanged) {
listener.mHasSentData = true;
currentListeners.AppendElement(listener.mListener);
}
}
}
if (!currentListeners.IsEmpty()) {
uint32_t resultCount = aAccessPoints.Count();
nsTArray<RefPtr<nsIWifiAccessPoint>> accessPoints(resultCount);
for (uint32_t i = 0; i < resultCount; i++) {
accessPoints.AppendElement(aAccessPoints[i]);
}
nsCOMPtr<nsIThread> thread = do_GetMainThread();
if (!thread) return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIRunnable> runnable(new nsCallWifiListeners(
std::move(currentListeners), std::move(accessPoints)));
if (!runnable) return NS_ERROR_OUT_OF_MEMORY;
thread->Dispatch(runnable, NS_DISPATCH_SYNC);
}
return NS_OK;
}