Web Server

An asio-based, Acorn-inspired library for simple web service with routes.

Dependencies

1. A modern C++ compiler with proper <regex> library inside standard library. This disqualifies GCC, anything below 4.9 and some anscient, but still used VC++, like 2013.
2. Boost for the ASIO. In the future, probably dropped for the Networking TS.

Model

Just like with Acorn, or anything out there written in Node.js, you setup your routes based on express paths and middlewares, create a web::server, setup port (and/or interface, TBD), hand over the router and server.run().

Simple static server

#include <web/server.h>
#include <files/files.h>

int main(int argc, char* argv[])
{
    unsigned short port = 80;

    auto root = web::router::make();
    root->filter<web::middleware::files>(argv[0]);
    web::server server;
    server.set_routes(*root);
    if (!server.listen(port)) {
        fprintf(stderr, "server: cannot listen on port %u", port);
        return 2;
    }

    server.run();
}

Adding a route

root->add("/api/:id(\d+)/link.json", [links](const web::request& req, web::response& resp) {

    auto id_param = *req.param("id");
    auto it = links->find(id_param);
    if (it == links->end()) {
        resp.set(web::header::Content_Type, "text/json");
        resp.status(web::status::bad_request);
        resp.print(
            R"({"error": "Could not find link )" + id_param + R"("})"
        );
        return;
    }

    it->details(resp);
});

Credits

The code contains delegates from Code Review Stack Exchange, discovered by the InsideOS people. The code is attributed to user1095108.

The path_compiler.hcontains C++ implementation of pathToRegexp of pillarjs (current maintainer: Blake Embrey).