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Merged
merged 1 commit into from
Aug 6, 2025
Merged

ErrorLogger support (#870) #2195

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4 changes: 3 additions & 1 deletion Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -8,4 +8,6 @@ FROM scratch
COPY --from=builder /build/server /server
COPY docker/html/index.html /html/index.html
EXPOSE 80
CMD ["/server"]

ENTRYPOINT ["/server"]
CMD ["0.0.0.0", "80", "/", "/html"]
212 changes: 169 additions & 43 deletions docker/main.cc
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Expand Up @@ -5,77 +5,203 @@
// MIT License
//

#include <atomic>
#include <chrono>
#include <ctime>
#include <format>
#include <iomanip>
#include <iostream>
#include <signal.h>
#include <sstream>

#include <httplib.h>

constexpr auto error_html = R"(<html>
<head><title>{} {}</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>cpp-httplib/{}</center>
</body>
</html>
)";
using namespace httplib;

void sigint_handler(int s) { exit(1); }
auto SERVER_NAME =
std::format("cpp-httplib-nginxish-server/{}", CPPHTTPLIB_VERSION);

std::string time_local() {
auto p = std::chrono::system_clock::now();
auto t = std::chrono::system_clock::to_time_t(p);
Server svr;

void signal_handler(int signal) {
if (signal == SIGINT || signal == SIGTERM) {
std::cout << std::format("\nReceived signal, shutting down gracefully...")
<< std::endl;
svr.stop();
}
}

std::string get_nginx_time_format() {
auto now = std::chrono::system_clock::now();
auto time_t = std::chrono::system_clock::to_time_t(now);

std::stringstream ss;
ss << std::put_time(std::localtime(&t), "%d/%b/%Y:%H:%M:%S %z");
ss << std::put_time(std::localtime(&time_t), "%d/%b/%Y:%H:%M:%S %z");
return ss.str();
}

std::string log(auto &req, auto &res) {
auto remote_user = "-"; // TODO:
auto request = std::format("{} {} {}", req.method, req.path, req.version);
auto body_bytes_sent = res.get_header_value("Content-Length");
auto http_referer = "-"; // TODO:
auto http_user_agent = req.get_header_value("User-Agent", "-");

// NOTE: From NGINX default access log format
// log_format combined '$remote_addr - $remote_user [$time_local] '
// '"$request" $status $body_bytes_sent '
// '"$http_referer" "$http_user_agent"';
return std::format(R"({} - {} [{}] "{}" {} {} "{}" "{}")", req.remote_addr,
remote_user, time_local(), request, res.status,
body_bytes_sent, http_referer, http_user_agent);
std::string get_nginx_error_time_format() {
auto now = std::chrono::system_clock::now();
auto time_t = std::chrono::system_clock::to_time_t(now);

std::stringstream ss;
ss << std::put_time(std::localtime(&time_t), "%Y/%m/%d %H:%M:%S");
return ss.str();
}

std::string get_client_ip(const Request &req) {
// Check for X-Forwarded-For header first (common in reverse proxy setups)
auto forwarded_for = req.get_header_value("X-Forwarded-For");
if (!forwarded_for.empty()) {
// Get the first IP if there are multiple
auto comma_pos = forwarded_for.find(',');
if (comma_pos != std::string::npos) {
return forwarded_for.substr(0, comma_pos);
}
return forwarded_for;
}

// Check for X-Real-IP header
auto real_ip = req.get_header_value("X-Real-IP");
if (!real_ip.empty()) { return real_ip; }

// Fallback to remote address (though cpp-httplib doesn't provide this
// directly) For demonstration, we'll use a placeholder
return "127.0.0.1";
}

int main(int argc, const char **argv) {
signal(SIGINT, sigint_handler);
// NGINX Combined log format:
// $remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent
// "$http_referer" "$http_user_agent"
void nginx_access_logger(const Request &req, const Response &res) {
std::string remote_addr = get_client_ip(req);
std::string remote_user =
"-"; // cpp-httplib doesn't have built-in auth user tracking
std::string time_local = get_nginx_time_format();
std::string request =
std::format("{} {} {}", req.method, req.path, req.version);
int status = res.status;
size_t body_bytes_sent = res.body.size();
std::string http_referer = req.get_header_value("Referer");
if (http_referer.empty()) http_referer = "-";
std::string http_user_agent = req.get_header_value("User-Agent");
if (http_user_agent.empty()) http_user_agent = "-";

std::cout << std::format("{} - {} [{}] \"{}\" {} {} \"{}\" \"{}\"",
remote_addr, remote_user, time_local, request,
status, body_bytes_sent, http_referer,
http_user_agent)
<< std::endl;
}

auto base_dir = "./html";
auto host = "0.0.0.0";
auto port = 80;
// NGINX Error log format:
// YYYY/MM/DD HH:MM:SS [level] message, client: client_ip, request: "request",
// host: "host"
void nginx_error_logger(const Error &err, const Request *req) {
std::string time_local = get_nginx_error_time_format();
std::string level = "error";

if (req) {
std::string client_ip = get_client_ip(*req);
std::string request =
std::format("{} {} {}", req->method, req->path, req->version);
std::string host = req->get_header_value("Host");
if (host.empty()) host = "-";

std::cerr << std::format("{} [{}] {}, client: {}, request: "
"\"{}\", host: \"{}\"",
time_local, level, to_string(err), client_ip,
request, host)
<< std::endl;
} else {
// If no request context, just log the error
std::cerr << std::format("{} [{}] {}", time_local, level, to_string(err))
<< std::endl;
}
}

httplib::Server svr;
void print_usage(const char *program_name) {
std::cout << std::format("Usage: {} <hostname> <port> <mount_point> "
"<document_root_directory>",
program_name)
<< std::endl;

svr.set_error_handler([](auto & /*req*/, auto &res) {
auto body =
std::format(error_html, res.status, httplib::status_message(res.status),
CPPHTTPLIB_VERSION);
std::cout << std::format("Example: {} localhost 8080 /var/www/html .",
program_name)
<< std::endl;
}

res.set_content(body, "text/html");
int main(int argc, char *argv[]) {
if (argc != 5) {
print_usage(argv[0]);
return 1;
}

std::string hostname = argv[1];
auto port = std::atoi(argv[2]);
std::string mount_point = argv[3];
std::string document_root = argv[4];

svr.set_logger(nginx_access_logger);
svr.set_error_logger(nginx_error_logger);

auto ret = svr.set_mount_point(mount_point, document_root);
if (!ret) {
std::cerr
<< std::format(
"Error: Cannot mount '{}' to '{}'. Directory may not exist.",
mount_point, document_root)
<< std::endl;
return 1;
}

svr.set_file_extension_and_mimetype_mapping("html", "text/html");
svr.set_file_extension_and_mimetype_mapping("htm", "text/html");
svr.set_file_extension_and_mimetype_mapping("css", "text/css");
svr.set_file_extension_and_mimetype_mapping("js", "text/javascript");
svr.set_file_extension_and_mimetype_mapping("json", "application/json");
svr.set_file_extension_and_mimetype_mapping("xml", "application/xml");
svr.set_file_extension_and_mimetype_mapping("png", "image/png");
svr.set_file_extension_and_mimetype_mapping("jpg", "image/jpeg");
svr.set_file_extension_and_mimetype_mapping("jpeg", "image/jpeg");
svr.set_file_extension_and_mimetype_mapping("gif", "image/gif");
svr.set_file_extension_and_mimetype_mapping("svg", "image/svg+xml");
svr.set_file_extension_and_mimetype_mapping("ico", "image/x-icon");
svr.set_file_extension_and_mimetype_mapping("pdf", "application/pdf");
svr.set_file_extension_and_mimetype_mapping("zip", "application/zip");
svr.set_file_extension_and_mimetype_mapping("txt", "text/plain");

svr.set_error_handler([](const Request & /*req*/, Response &res) {
if (res.status == 404) {
res.set_content(
std::format(
"<html><head><title>404 Not Found</title></head>"
"<body><h1>404 Not Found</h1>"
"<p>The requested resource was not found on this server.</p>"
"<hr><p>{}</p></body></html>",
SERVER_NAME),
"text/html");
}
});

svr.set_logger(
[](auto &req, auto &res) { std::cout << log(req, res) << std::endl; });
svr.set_pre_routing_handler([](const Request & /*req*/, Response &res) {
res.set_header("Server", SERVER_NAME);
return Server::HandlerResponse::Unhandled;
});

svr.set_mount_point("/", base_dir);
signal(SIGINT, signal_handler);
signal(SIGTERM, signal_handler);

std::cout << std::format("Serving HTTP on {0} port {1} ...", host, port)
std::cout << std::format("Serving HTTP on {}:{}", hostname, port)
<< std::endl;
std::cout << std::format("Mount point: {} -> {}", mount_point, document_root)
<< std::endl;
std::cout << std::format("Press Ctrl+C to shutdown gracefully...")
<< std::endl;

ret = svr.listen(hostname, port);

auto ret = svr.listen(host, port);
std::cout << std::format("Server has been shut down.") << std::endl;

return ret ? 0 : 1;
}
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