gecko-dev/netwerk/wifi/nsWifiMonitor.cpp

266 lines
7.0 KiB
C++

/* 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/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"));
}
nsWifiMonitor::~nsWifiMonitor()
{
}
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_NewThread(getter_AddRefs(mThread), this);
if (NS_FAILED(rv))
return rv;
}
mListeners.AppendElement(nsWifiListener(new nsMainThreadPtrHolder<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(nsAutoPtr<WifiListenerArray> aListeners,
nsresult aResult)
: mListeners(aListeners),
mResult(aResult)
{}
private:
~nsPassErrorToWifiListeners() {}
nsAutoPtr<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"));
PR_SetCurrentThreadName("Wifi Monitor");
nsresult rv = DoScan();
LOG(("@@@@@ wifi monitor run::doscan complete %x\n", rv));
nsAutoPtr<WifiListenerArray> currentListeners;
bool doError = false;
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
if (mKeepGoing && NS_FAILED(rv)) {
doError = true;
currentListeners = new WifiListenerArray(mListeners.Length());
for (uint32_t i = 0; i < mListeners.Length(); i++)
currentListeners->AppendElement(mListeners[i].mListener);
}
mThreadComplete = true;
}
if (doError) {
nsCOMPtr<nsIThread> thread = do_GetMainThread();
if (!thread)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIRunnable> runnable(new nsPassErrorToWifiListeners(currentListeners, rv));
if (!runnable)
return NS_ERROR_OUT_OF_MEMORY;
thread->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(nsAutoPtr<WifiListenerArray> aListeners,
nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > aAccessPoints)
: mListeners(aListeners),
mAccessPoints(aAccessPoints)
{}
private:
~nsCallWifiListeners() {}
nsAutoPtr<WifiListenerArray> mListeners;
nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > mAccessPoints;
};
NS_IMPL_ISUPPORTS(nsCallWifiListeners,
nsIRunnable)
NS_IMETHODIMP nsCallWifiListeners::Run()
{
LOG(("About to send data to the wifi listeners\n"));
for (size_t i = 0; i < mListeners->Length(); i++) {
(*mListeners)[i]->OnChange(mAccessPoints->Elements(), mAccessPoints->Length());
}
return NS_OK;
}
nsresult
nsWifiMonitor::CallWifiListeners(const nsCOMArray<nsWifiAccessPoint> &aAccessPoints,
bool aAccessPointsChanged)
{
nsAutoPtr<WifiListenerArray> currentListeners;
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
currentListeners = new WifiListenerArray(mListeners.Length());
for (uint32_t i = 0; i < mListeners.Length(); i++) {
if (!mListeners[i].mHasSentData || aAccessPointsChanged) {
mListeners[i].mHasSentData = true;
currentListeners->AppendElement(mListeners[i].mListener);
}
}
}
if (currentListeners->Length() > 0)
{
uint32_t resultCount = aAccessPoints.Count();
nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > accessPoints(
new nsTArray<nsIWifiAccessPoint *>(resultCount));
if (!accessPoints)
return NS_ERROR_OUT_OF_MEMORY;
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(currentListeners, accessPoints));
if (!runnable)
return NS_ERROR_OUT_OF_MEMORY;
thread->Dispatch(runnable, NS_DISPATCH_SYNC);
}
return NS_OK;
}