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accept_server.cc
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accept_server.cc
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// Copyright 2021, Beeri 15. All rights reserved.
// Author: Roman Gershman (romange@gmail.com)
//
#include "util/accept_server.h"
#include <signal.h>
#include "base/logging.h"
#include "util/fiber_socket_base.h"
#include "util/listener_interface.h"
#include "util/proactor_pool.h"
namespace util {
using namespace boost;
using namespace std;
AcceptServer::AcceptServer(ProactorPool* pool, PMR_NS::memory_resource* mr, bool break_on_int)
: pool_(pool), mr_(mr), ref_bc_(0) {
if (break_on_int) {
ProactorBase* proactor = pool_->GetNextProactor();
proactor->RegisterSignal({SIGINT, SIGTERM}, [this](int signal) {
LOG(INFO) << "Exiting on signal " << strsignal(signal);
if (on_break_hook_) {
on_break_hook_();
}
BreakListeners();
});
}
}
AcceptServer::~AcceptServer() {
list_interface_.clear();
}
void AcceptServer::Run() {
VLOG(1) << "AcceptServer::Run";
if (!list_interface_.empty()) {
ref_bc_->Add(list_interface_.size());
for (auto& lw : list_interface_) {
ProactorBase* proactor = lw->socket()->proactor();
// We must capture ref_bc_ by value because once it is decremented, AcceptServer
// instance can be destroyed before Dec returnes.
proactor->Dispatch([li = lw.get(), bc = ref_bc_]() mutable {
li->RunAcceptLoop();
bc->Dec();
});
}
}
was_run_ = true;
}
// If wait is false - does not wait for the server to stop.
// Then you need to run Wait() to wait for proper shutdown.
void AcceptServer::Stop(bool wait) {
VLOG(1) << "AcceptServer::Stop";
BreakListeners();
if (wait)
Wait();
}
void AcceptServer::Wait() {
VLOG(1) << "AcceptServer::Wait";
if (was_run_) {
ref_bc_->Wait();
VLOG(1) << "AcceptServer::Wait completed";
was_run_ = false;
} else {
CHECK(list_interface_.empty()) << "Must Call AcceptServer::Run() after adding listeners";
}
}
// Returns the port number to which the listener was bound.
unsigned short AcceptServer::AddListener(unsigned short port, ListenerInterface* lii) {
error_code ec = AddListener(nullptr, port, lii);
CHECK(!ec) << "Could not open port " << port << " " << ec << "/" << ec.message();
auto ep = lii->socket()->LocalEndpoint();
return ep.port();
}
error_code AcceptServer::AddListener(const char* bind_addr, uint16_t port,
ListenerInterface* listener) {
CHECK(listener && !listener->socket());
CHECK(!was_run_);
char str_port[16];
struct addrinfo hints, *servinfo;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; /* Tuned for binding, see man getaddrinfo. */
absl::numbers_internal::FastIntToBuffer(port, str_port);
int res = getaddrinfo(bind_addr, str_port, &hints, &servinfo);
if (res != 0) {
const char* errmsg = gai_strerror(res);
LOG(ERROR) << "Error resolving address " << bind_addr << ": " << errmsg;
return make_error_code(errc::address_not_available);
}
CHECK(servinfo);
ProactorBase* next = pool_->GetNextProactor();
unique_ptr<FiberSocketBase> fs{next->CreateSocket()};
DCHECK(fs);
error_code ec;
int family_pref[2] = {AF_INET, AF_INET6};
auto sock_create_cb = [&] {
// Try ip4 first
for (unsigned j = 0; j < 2; ++j) {
for (addrinfo* p = servinfo; p != NULL; p = p->ai_next) {
if (p->ai_family != family_pref[j])
continue;
ec = fs->Create(p->ai_family);
if (ec)
continue;
ec = listener->ConfigureServerSocket(fs->native_handle());
if (ec)
break;
ec = fs->Bind(p->ai_addr, p->ai_addrlen);
if (ec)
break;
ec = fs->Listen(backlog_);
if (!ec) {
const char* safe_bind = bind_addr ? bind_addr : "";
VLOG(1) << "AddListener [" << fs->native_handle() << "] family: " << p->ai_family << " "
<< safe_bind << ":" << port;
return true;
}
}
(void)fs->Close();
}
return false;
};
bool success = next->Await(std::move(sock_create_cb));
freeaddrinfo(servinfo);
if (success) {
DCHECK(fs->IsOpen());
listener->InitByAcceptServer(pool_, mr_);
listener->sock_ = std::move(fs);
list_interface_.emplace_back(listener);
}
return ec;
}
error_code AcceptServer::AddUDSListener(const char* path, mode_t permissions,
ListenerInterface* listener) {
CHECK(listener && !listener->socket());
CHECK(!was_run_);
ProactorBase* next = pool_->GetNextProactor();
unique_ptr<FiberSocketBase> fs{next->CreateSocket()};
error_code ec = next->Await([&] {
error_code ec = fs->Create(AF_UNIX);
if (ec)
return ec;
ec = listener->ConfigureServerSocket(fs->native_handle());
if (ec)
return ec;
return fs->ListenUDS(path, permissions, backlog_);
});
if (!ec) {
listener->InitByAcceptServer(pool_, mr_);
listener->sock_ = std::move(fs);
list_interface_.emplace_back(listener);
}
return ec;
}
void AcceptServer::BreakListeners() {
for (auto& lw : list_interface_) {
ProactorBase* proactor = lw->socket()->proactor();
proactor->Dispatch([sock = lw->socket()] {
if (sock->IsOpen()) {
auto ec = sock->Shutdown(SHUT_RDWR);
LOG_IF(WARNING, ec) << "Error shutting down a socket " << ec.message();
}
});
}
VLOG(1) << "AcceptServer::BreakListeners finished";
}
} // namespace util