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/* -*- 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 "nsDNSServiceDiscovery.h"
#include "MDNSResponderOperator.h"
#include "nsICancelable.h"
#include "nsXULAppAPI.h"
#include "private/pprio.h"
namespace mozilla {
namespace net {
namespace {
inline void StartService() {}
inline void StopService() {}
class ServiceCounter {
public:
static bool IsServiceRunning() { return !!sUseCount; }
private:
static uint32_t sUseCount;
protected:
ServiceCounter() {
MOZ_ASSERT(NS_IsMainThread());
if (!sUseCount++) {
StartService();
}
}
virtual ~ServiceCounter() {
MOZ_ASSERT(NS_IsMainThread());
if (!--sUseCount) {
StopService();
}
}
};
uint32_t ServiceCounter::sUseCount = 0;
class DiscoveryRequest final : public nsICancelable, private ServiceCounter {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSICANCELABLE
explicit DiscoveryRequest(nsDNSServiceDiscovery* aService,
nsIDNSServiceDiscoveryListener* aListener);
private:
virtual ~DiscoveryRequest() { Cancel(NS_OK); }
RefPtr<nsDNSServiceDiscovery> mService;
nsIDNSServiceDiscoveryListener* mListener;
};
NS_IMPL_ISUPPORTS(DiscoveryRequest, nsICancelable)
DiscoveryRequest::DiscoveryRequest(nsDNSServiceDiscovery* aService,
nsIDNSServiceDiscoveryListener* aListener)
: mService(aService), mListener(aListener) {}
NS_IMETHODIMP
DiscoveryRequest::Cancel(nsresult aReason) {
if (mService) {
mService->StopDiscovery(mListener);
}
mService = nullptr;
return NS_OK;
}
class RegisterRequest final : public nsICancelable, private ServiceCounter {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSICANCELABLE
explicit RegisterRequest(nsDNSServiceDiscovery* aService,
nsIDNSRegistrationListener* aListener);
private:
virtual ~RegisterRequest() { Cancel(NS_OK); }
RefPtr<nsDNSServiceDiscovery> mService;
nsIDNSRegistrationListener* mListener;
};
NS_IMPL_ISUPPORTS(RegisterRequest, nsICancelable)
RegisterRequest::RegisterRequest(nsDNSServiceDiscovery* aService,
nsIDNSRegistrationListener* aListener)
: mService(aService), mListener(aListener) {}
NS_IMETHODIMP
RegisterRequest::Cancel(nsresult aReason) {
if (mService) {
mService->UnregisterService(mListener);
}
mService = nullptr;
return NS_OK;
}
} // namespace
NS_IMPL_ISUPPORTS(nsDNSServiceDiscovery, nsIDNSServiceDiscovery)
nsresult nsDNSServiceDiscovery::Init() {
if (!XRE_IsParentProcess()) {
MOZ_ASSERT(false,
"nsDNSServiceDiscovery can only be used in parent process");
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
nsDNSServiceDiscovery::StartDiscovery(const nsACString& aServiceType,
nsIDNSServiceDiscoveryListener* aListener,
nsICancelable** aRetVal) {
MOZ_ASSERT(aRetVal);
nsresult rv;
if (NS_WARN_IF(NS_FAILED(rv = StopDiscovery(aListener)))) {
return rv;
}
nsCOMPtr<nsICancelable> req = new DiscoveryRequest(this, aListener);
RefPtr<BrowseOperator> browserOp =
new BrowseOperator(aServiceType, aListener);
if (NS_WARN_IF(NS_FAILED(rv = browserOp->Start()))) {
return rv;
}
mDiscoveryMap.Put(aListener, std::move(browserOp));
req.forget(aRetVal);
return NS_OK;
}
NS_IMETHODIMP
nsDNSServiceDiscovery::StopDiscovery(
nsIDNSServiceDiscoveryListener* aListener) {
nsresult rv;
RefPtr<BrowseOperator> browserOp;
if (!mDiscoveryMap.Get(aListener, getter_AddRefs(browserOp))) {
return NS_OK;
}
browserOp->Cancel(); // cancel non-started operation
if (NS_WARN_IF(NS_FAILED(rv = browserOp->Stop()))) {
return rv;
}
mDiscoveryMap.Remove(aListener);
return NS_OK;
}
NS_IMETHODIMP
nsDNSServiceDiscovery::RegisterService(nsIDNSServiceInfo* aServiceInfo,
nsIDNSRegistrationListener* aListener,
nsICancelable** aRetVal) {
MOZ_ASSERT(aRetVal);
nsresult rv;
if (NS_WARN_IF(NS_FAILED(rv = UnregisterService(aListener)))) {
return rv;
}
nsCOMPtr<nsICancelable> req = new RegisterRequest(this, aListener);
RefPtr<RegisterOperator> registerOp =
new RegisterOperator(aServiceInfo, aListener);
if (NS_WARN_IF(NS_FAILED(rv = registerOp->Start()))) {
return rv;
}
mRegisterMap.Put(aListener, std::move(registerOp));
req.forget(aRetVal);
return NS_OK;
}
NS_IMETHODIMP
nsDNSServiceDiscovery::UnregisterService(
nsIDNSRegistrationListener* aListener) {
nsresult rv;
RefPtr<RegisterOperator> registerOp;
if (!mRegisterMap.Get(aListener, getter_AddRefs(registerOp))) {
return NS_OK;
}
registerOp->Cancel(); // cancel non-started operation
if (NS_WARN_IF(NS_FAILED(rv = registerOp->Stop()))) {
return rv;
}
mRegisterMap.Remove(aListener);
return NS_OK;
}
NS_IMETHODIMP
nsDNSServiceDiscovery::ResolveService(nsIDNSServiceInfo* aServiceInfo,
nsIDNSServiceResolveListener* aListener) {
if (!ServiceCounter::IsServiceRunning()) {
return NS_ERROR_FAILURE;
}
nsresult rv;
RefPtr<ResolveOperator> resolveOp =
new ResolveOperator(aServiceInfo, aListener);
if (NS_WARN_IF(NS_FAILED(rv = resolveOp->Start()))) {
return rv;
}
return NS_OK;
}
} // namespace net
} // namespace mozilla
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