lib/cpp-httplib
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cpp-httplib/docker/main.cc
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//
// main.cc
//
// Copyright (c) 2025 Yuji Hirose. All rights reserved.
// MIT License
//
#include <atomic>
#include <chrono>
#include <ctime>
#include <format>
#include <iomanip>
#include <iostream>
#include <signal.h>
#include <sstream>
#include <httplib.h>
using namespace httplib;
const auto SERVER_NAME =
std::format("cpp-httplib-server/{}", CPPHTTPLIB_VERSION);
Server svr;
void signal_handler(int signal) {
if (signal == SIGINT || signal == SIGTERM) {
std::cout << "\nReceived signal, shutting down gracefully...\n";
svr.stop();
}
}
std::string get_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), "%d/%b/%Y:%H:%M:%S %z");
return ss.str();
}
std::string get_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";
}
// 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) {
auto remote_addr = get_client_ip(req);
std::string remote_user =
"-"; // cpp-httplib doesn't have built-in auth user tracking
auto time_local = get_time_format();
auto request = std::format("{} {} {}", req.method, req.path, req.version);
auto status = res.status;
auto body_bytes_sent = res.body.size();
auto http_referer = req.get_header_value("Referer");
if (http_referer.empty()) http_referer = "-";
auto 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;
}
// 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) {
auto time_local = get_error_time_format();
std::string level = "error";
if (req) {
auto client_ip = get_client_ip(*req);
auto request =
std::format("{} {} {}", req->method, req->path, req->version);
auto 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;
}
}
void print_usage(const char *program_name) {
std::cout << "Usage: " << program_name << " [OPTIONS]" << std::endl;
std::cout << std::endl;
std::cout << "Options:" << std::endl;
std::cout << " --host <hostname> Server hostname (default: localhost)"
<< std::endl;
std::cout << " --port <port> Server port (default: 8080)"
<< std::endl;
std::cout << " --mount <mount:path> Mount point and document root"
<< std::endl;
std::cout << " Format: mount_point:document_root"
<< std::endl;
std::cout << " (default: /:./html)" << std::endl;
std::cout << " --version Show version information"
<< std::endl;
std::cout << " --help Show this help message" << std::endl;
std::cout << std::endl;
std::cout << "Examples:" << std::endl;
std::cout << " " << program_name
<< " --host localhost --port 8080 --mount /:./html" << std::endl;
std::cout << " " << program_name
<< " --host 0.0.0.0 --port 3000 --mount /api:./api" << std::endl;
}
struct ServerConfig {
std::string hostname = "localhost";
int port = 8080;
std::string mount_point = "/";
std::string document_root = "./html";
};
enum class ParseResult { SUCCESS, HELP_REQUESTED, VERSION_REQUESTED, ERROR };
ParseResult parse_command_line(int argc, char *argv[], ServerConfig &config) {
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
print_usage(argv[0]);
return ParseResult::HELP_REQUESTED;
} else if (strcmp(argv[i], "--host") == 0) {
if (i + 1 >= argc) {
std::cerr << "Error: --host requires a hostname argument" << std::endl;
print_usage(argv[0]);
return ParseResult::ERROR;
}
config.hostname = argv[++i];
} else if (strcmp(argv[i], "--port") == 0) {
if (i + 1 >= argc) {
std::cerr << "Error: --port requires a port number argument"
<< std::endl;
print_usage(argv[0]);
return ParseResult::ERROR;
}
config.port = std::atoi(argv[++i]);
if (config.port <= 0 || config.port > 65535) {
std::cerr << "Error: Invalid port number. Must be between 1 and 65535"
<< std::endl;
return ParseResult::ERROR;
}
} else if (strcmp(argv[i], "--mount") == 0) {
if (i + 1 >= argc) {
std::cerr
<< "Error: --mount requires mount_point:document_root argument"
<< std::endl;
print_usage(argv[0]);
return ParseResult::ERROR;
}
std::string mount_arg = argv[++i];
auto colon_pos = mount_arg.find(':');
if (colon_pos == std::string::npos) {
std::cerr << "Error: --mount argument must be in format "
"mount_point:document_root"
<< std::endl;
print_usage(argv[0]);
return ParseResult::ERROR;
}
config.mount_point = mount_arg.substr(0, colon_pos);
config.document_root = mount_arg.substr(colon_pos + 1);
if (config.mount_point.empty() || config.document_root.empty()) {
std::cerr
<< "Error: Both mount_point and document_root must be non-empty"
<< std::endl;
return ParseResult::ERROR;
}
} else if (strcmp(argv[i], "--version") == 0) {
std::cout << CPPHTTPLIB_VERSION << std::endl;
return ParseResult::VERSION_REQUESTED;
} else {
std::cerr << "Error: Unknown option '" << argv[i] << "'" << std::endl;
print_usage(argv[0]);
return ParseResult::ERROR;
}
}
return ParseResult::SUCCESS;
}
bool setup_server(Server &svr, const ServerConfig &config) {
svr.set_logger(nginx_access_logger);
svr.set_error_logger(nginx_error_logger);
auto ret = svr.set_mount_point(config.mount_point, config.document_root);
if (!ret) {
std::cerr
<< std::format(
"Error: Cannot mount '{}' to '{}'. Directory may not exist.",
config.mount_point, config.document_root)
<< std::endl;
return false;
}
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_pre_routing_handler([](const Request & /*req*/, Response &res) {
res.set_header("Server", SERVER_NAME);
return Server::HandlerResponse::Unhandled;
});
signal(SIGINT, signal_handler);
signal(SIGTERM, signal_handler);
return true;
}
int main(int argc, char *argv[]) {
ServerConfig config;
auto result = parse_command_line(argc, argv, config);
switch (result) {
case ParseResult::HELP_REQUESTED:
case ParseResult::VERSION_REQUESTED: return 0;
case ParseResult::ERROR: return 1;
case ParseResult::SUCCESS: break;
}
if (!setup_server(svr, config)) { return 1; }
std::cout << "Serving HTTP on " << config.hostname << ":" << config.port
<< std::endl;
std::cout << "Mount point: " << config.mount_point << " -> "
<< config.document_root << std::endl;
std::cout << "Press Ctrl+C to shutdown gracefully..." << std::endl;
auto ret = svr.listen(config.hostname, config.port);
std::cout << "Server has been shut down." << std::endl;
return ret ? 0 : 1;
}
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