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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ipc/attachment_broker_unprivileged.h"
#include "base/lazy_instance.h"
#include "base/metrics/histogram_macros.h"
#include "build/build_config.h"
#include "ipc/ipc_channel.h"
#include "ipc/ipc_endpoint.h"
#if defined(OS_WIN)
#include "ipc/attachment_broker_unprivileged_win.h"
#endif
#if defined(OS_MACOSX) && !defined(OS_IOS)
#include "ipc/attachment_broker_unprivileged_mac.h"
#endif
namespace IPC {
namespace {
// On platforms that support attachment brokering, returns a new instance of
// a platform-specific attachment broker. Otherwise returns |nullptr|.
// The caller takes ownership of the newly created instance, and is
// responsible for ensuring that the attachment broker lives longer than
// every IPC::Channel. The new instance automatically registers itself as the
// global attachment broker.
scoped_ptr<AttachmentBrokerUnprivileged> CreateBroker() {
#if defined(OS_WIN)
return scoped_ptr<AttachmentBrokerUnprivileged>(
new IPC::AttachmentBrokerUnprivilegedWin);
#elif defined(OS_MACOSX) && !defined(OS_IOS)
return scoped_ptr<AttachmentBrokerUnprivileged>(
new IPC::AttachmentBrokerUnprivilegedMac);
#else
return nullptr;
#endif
}
// This class is wrapped in a LazyInstance to ensure that its constructor is
// only called once. The constructor creates an attachment broker and sets it as
// the global broker.
class AttachmentBrokerMakeOnce {
public:
AttachmentBrokerMakeOnce() {
// Single process tests can cause an attachment broker to already exist.
if (AttachmentBroker::GetGlobal())
return;
attachment_broker_ = CreateBroker();
}
private:
scoped_ptr<IPC::AttachmentBrokerUnprivileged> attachment_broker_;
};
base::LazyInstance<AttachmentBrokerMakeOnce>::Leaky
g_attachment_broker_make_once = LAZY_INSTANCE_INITIALIZER;
} // namespace
AttachmentBrokerUnprivileged::AttachmentBrokerUnprivileged()
: sender_(nullptr) {
IPC::AttachmentBroker::SetGlobal(this);
}
AttachmentBrokerUnprivileged::~AttachmentBrokerUnprivileged() {
IPC::AttachmentBroker::SetGlobal(nullptr);
}
// static
void AttachmentBrokerUnprivileged::CreateBrokerIfNeeded() {
g_attachment_broker_make_once.Get();
}
void AttachmentBrokerUnprivileged::RegisterBrokerCommunicationChannel(
Endpoint* endpoint) {
DCHECK(endpoint);
DCHECK(!sender_);
sender_ = endpoint;
endpoint->SetAttachmentBrokerEndpoint(true);
}
void AttachmentBrokerUnprivileged::DeregisterBrokerCommunicationChannel(
Endpoint* endpoint) {
DCHECK(endpoint);
DCHECK_EQ(endpoint, sender_);
sender_ = nullptr;
}
bool AttachmentBrokerUnprivileged::IsPrivilegedBroker() {
return false;
}
void AttachmentBrokerUnprivileged::LogError(UMAError error) {
UMA_HISTOGRAM_ENUMERATION(
"IPC.AttachmentBrokerUnprivileged.BrokerAttachmentError", error,
ERROR_MAX);
}
} // namespace IPC
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