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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "server_socket.h"
#include "socket_spec.h"
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <chrono>
#include <thread>
#include <vespa/log/log.h>
LOG_SETUP(".vespalib.net.server_socket");
namespace vespalib {
namespace {
SocketHandle adjust_blocking(SocketHandle handle, bool value) {
if (handle.valid() && handle.set_blocking(value)) {
return handle;
} else {
return SocketHandle();
}
}
bool is_blocked(int err) { return ((err == EWOULDBLOCK) || (err == EAGAIN)); }
bool is_socket(const vespalib::string &path) {
struct stat info;
if (path.empty() || (lstat(path.c_str(), &info) != 0)) {
return false;
}
return S_ISSOCK(info.st_mode);
}
}
void
ServerSocket::cleanup()
{
if (valid() && is_socket(_path)) {
unlink(_path.c_str());
}
}
ServerSocket::ServerSocket(const SocketSpec &spec)
: _handle(adjust_blocking(spec.server_address().listen(), false)),
_path(spec.path()),
_blocking(true),
_shutdown(false)
{
if (!_handle.valid() && is_socket(_path)) {
if (!spec.client_address().connect_async().valid()) {
LOG(warning, "removing old socket: '%s'", _path.c_str());
unlink(_path.c_str());
_handle = spec.server_address().listen();
}
}
if (!_handle.valid()) {
LOG(warning, "listen failed: '%s'", spec.spec().c_str());
}
}
ServerSocket::ServerSocket(const vespalib::string &spec)
: ServerSocket(SocketSpec(spec))
{
}
ServerSocket::ServerSocket(int port)
: ServerSocket(SocketSpec::from_port(port))
{
}
ServerSocket::ServerSocket(ServerSocket &&rhs)
: _handle(std::move(rhs._handle)),
_path(std::move(rhs._path)),
_blocking(rhs._blocking),
_shutdown(rhs._shutdown.load(std::memory_order_acquire))
{
rhs._path.clear();
}
ServerSocket &
ServerSocket::operator=(ServerSocket &&rhs)
{
cleanup();
_handle = std::move(rhs._handle);
_path = std::move(rhs._path);
_blocking = rhs._blocking;
_shutdown.store(rhs._shutdown.load(std::memory_order_acquire), std::memory_order_release);
rhs._path.clear();
return *this;
}
SocketAddress
ServerSocket::address() const
{
return SocketAddress::address_of(_handle.get());
}
void
ServerSocket::shutdown()
{
_shutdown.store(true, std::memory_order_release);
_handle.shutdown();
}
SocketHandle
ServerSocket::accept()
{
if (!_blocking) {
return adjust_blocking(_handle.accept(), true);
} else {
for (;;) {
if (_shutdown.load(std::memory_order_acquire)) {
errno = EIO;
return SocketHandle();
}
SocketHandle res = _handle.accept();
if (res.valid() || !is_blocked(errno)) {
return adjust_blocking(std::move(res), true);
}
std::this_thread::sleep_for(std::chrono::milliseconds(10));
}
}
}
} // namespace vespalib
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