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// Copyright 2013 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 "extensions/common/features/feature_channel.h"
#include "base/logging.h"
#include "components/version_info/version_info.h"
namespace {
// The current channel to be reported, unless overridden by
// |ScopedCurrentChannel|.
version_info::Channel g_current_channel = version_info::Channel::STABLE;
// The current channel overridden by |ScopedCurrentChannel|. The value is valid
// only whenever |g_override_count| is non-zero.
version_info::Channel g_overridden_channel = version_info::Channel::STABLE;
// The number of currently existing instances of |ScopedCurrentChannel|.
int g_override_count = 0;
} // namespace
namespace extensions {
version_info::Channel GetCurrentChannel() {
return g_override_count ? g_overridden_channel : g_current_channel;
}
void SetCurrentChannel(version_info::Channel channel) {
// In certain unit tests, SetCurrentChannel can be called within the same
// process (where e.g. utility processes run as a separate thread). Don't
// write if the value is the same to avoid TSAN failures.
if (channel != g_current_channel)
g_current_channel = channel;
}
ScopedCurrentChannel::ScopedCurrentChannel(version_info::Channel channel)
: channel_(channel),
original_overridden_channel_(g_overridden_channel),
original_override_count_(g_override_count) {
g_overridden_channel = channel;
++g_override_count;
}
ScopedCurrentChannel::~ScopedCurrentChannel() {
DCHECK_EQ(original_override_count_ + 1, g_override_count)
<< "Scoped channel setters are not nested properly";
DCHECK_EQ(g_overridden_channel, channel_)
<< "Scoped channel setters are not nested properly";
g_overridden_channel = original_overridden_channel_;
--g_override_count;
}
} // namespace extensions
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