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extend lifetime of returned network interface object

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Signed-off-by: Duc Canh Le <duccanh.le@ahrefs.com>
This commit is contained in:
Duc Canh Le 2023-09-22 04:57:29 +00:00
parent 7883ae0d8c
commit 3b48b5aa5e
1 changed files with 10 additions and 16 deletions
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26
src/Common/isLocalAddress.cpp
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@ -36,13 +36,6 @@ struct NetworkInterfaces : public boost::noncopyable
}
}
void swap(NetworkInterfaces && other)
{
auto * tmp = ifaddr;
ifaddr = other.ifaddr;
other.ifaddr = tmp;
}
bool hasAddress(const Poco::Net::IPAddress & address) const
{
ifaddrs * iface;
@ -87,23 +80,24 @@ struct NetworkInterfaces : public boost::noncopyable
freeifaddrs(ifaddr);
}
static const NetworkInterfaces & instance()
static std::shared_ptr<const NetworkInterfaces> instance()
{
static constexpr int NET_INTERFACE_VALID_PERIOD_MS = 30000;
static NetworkInterfaces nf;
static std::shared_ptr<const NetworkInterfaces> nf = std::make_shared<const NetworkInterfaces>();
static std::atomic<std::chrono::steady_clock::time_point> last_updated_time = std::chrono::steady_clock::now();
static std::shared_mutex nf_mtx;
auto now = std::chrono::steady_clock::now();
auto last_updated_time_snapshot = last_updated_time.load();
if (std::chrono::duration_cast<std::chrono::milliseconds>(now - last_updated_time_snapshot).count() > NET_INTERFACE_VALID_PERIOD_MS)
if (std::chrono::duration_cast<std::chrono::milliseconds>(now - last_updated_time.load()).count() > NET_INTERFACE_VALID_PERIOD_MS)
{
std::unique_lock lock(nf_mtx);
if (last_updated_time.load() != last_updated_time_snapshot) /// it's possible that last_updated_time after we get the snapshot
return nf;
nf.swap(NetworkInterfaces());
last_updated_time.store(now);
/// It's possible that last_updated_time after we get lock
if (std::chrono::duration_cast<std::chrono::milliseconds>(now - last_updated_time.load()).count() > NET_INTERFACE_VALID_PERIOD_MS)
{
nf = std::make_shared<const NetworkInterfaces>();
last_updated_time.store(now);
}
return nf;
}
else
@ -149,7 +143,7 @@ bool isLocalAddress(const Poco::Net::IPAddress & address)
}
}
return NetworkInterfaces::instance().hasAddress(address);
return NetworkInterfaces::instance()->hasAddress(address);
}