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Add timeout parameter and functionality to tcp_client::connect() function

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This commit is contained in:
jackm3232 2024-09-29 20:46:26 -04:00
parent e593f6695c
commit 839449e0ca
1 changed files with 27 additions and 9 deletions
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36
include/spdlog/details/tcp_client-windows.h
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@ -58,38 +58,54 @@ public:
SOCKET fd() const { return socket_; }
// try to connect or throw on failure
void connect(const std::string &host, int port) {
// try to connect to syslog server
// throw connection timed out error if unable to connect within specified time
void connect(const std::string &host, int port, int timeout_secs) {
// if socket is already connected, close pre-existing connection to start new connection
if (is_connected()) {
close();
}
// establish criteria of network connection
struct addrinfo hints {};
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC; // To work with IPv4, IPv6, and so on
hints.ai_socktype = SOCK_STREAM; // TCP
hints.ai_flags = AI_NUMERICSERV; // port passed as as numeric value
hints.ai_family = AF_UNSPEC; // To work with address families IPv4, IPv6, and so on
hints.ai_socktype = SOCK_STREAM; // TCP will be used to establish a reliable connection
hints.ai_protocol = 0;
// get address info of attempted connection, return 0 if successful
auto port_str = std::to_string(port);
struct addrinfo *addrinfo_result;
auto rv = ::getaddrinfo(host.c_str(), port_str.c_str(), &hints, &addrinfo_result);
int last_error = 0;
// if there was an error getting address info
if (rv != 0) {
last_error = ::WSAGetLastError();
WSACleanup();
throw_winsock_error_("getaddrinfo failed", last_error);
}
// Try each address until we successfully connect(2).
// try each address until we successfully connect
for (auto *rp = addrinfo_result; rp != nullptr; rp = rp->ai_next) {
// attempt to connect to current address, if unsuccessful move onto the next
socket_ = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (socket_ == INVALID_SOCKET) {
last_error = ::WSAGetLastError();
WSACleanup();
continue;
}
// set timeout for connection to user address, if no connection occurs within time limit move onto next address
struct timeval timeout_obj; // timeout_obj that will hold the timeout length
timeout_obj.tv_sec = timeout_secs; // set length of timeout in seconds based on passed-in parameter
timeout_obj.tv_usec = 0; // we are not using microseconds in this case
// server receive timeout (from user trying to connect)
setsockopt(socket_, SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout_obj, sizeof(timeout_obj));
// server send timeout (to user trying to connect)
setsockopt(socket_, SOL_SOCKET, SO_SNDTIMEO, (const char*)&timeout_obj, sizeof(timeout_obj));
// try to connect to syslog server using current address, if successful break out of loop
if (::connect(socket_, rp->ai_addr, (int)rp->ai_addrlen) == 0) {
break;
} else {
@ -97,13 +113,15 @@ public:
close();
}
}
// free address info and throw connection failed error if no connection was made
::freeaddrinfo(addrinfo_result);
if (socket_ == INVALID_SOCKET) {
WSACleanup();
throw_winsock_error_("connect failed", last_error);
}
// set TCP_NODELAY
// disable Nagle's algorithm to allow data packets to be sent immediately
int enable_flag = 1;
::setsockopt(socket_, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&enable_flag),
sizeof(enable_flag));