Siesta is a minimalistic HTTP, REST and Websocket framework for C++, written in pure-C++11, based upon NNG (Nanomsg-Next-Generation).
Main features:
- Webserver
- REST API
- Websocket (binary/text)
The design goals for Siesta are:
- Minimalistic and simple interface.
- Dynamic route creation and removal.
- Minimal dependencies. Unless you need TLS, the only dependency is NNG.
- No required payload format. Requests and responses are plain strings/data.
- Cross platform.
Siesta will basically run on any platform supported by NNG. These are (taken from NNG Github Readme): Linux, macOS, Windows (Vista or better), illumos, Solaris, FreeBSD, Android, and iOS.
Since payloads are plain strings/data, you're free to use any layer on top of this, f.i. JSON or XML.
By prefixing a URI route segment with ':', that segment of the URI becomes a URI parameter, which can be retrieved in the route handler:
...
server::TokenHolder h;
h += server->addRoute(
HttpMethod::GET,
"/:resource/:index",
[](const server::rest::Request& req, server::rest::Response& resp) {
const auto& uri_params = req.getUriParameters();
std::stringstream body;
body << "resource=" << uri_params.at("resource") << std::endl;
body << "index=" << uri_params.at("index") << std::endl;
resp.setBody(body.str());
});
...URI Queries are supported via server::Request::getQueries method:
...
server::TokenHolder h;
h += server->addRoute(
HttpMethod::GET,
"/resource/get",
[](const server::rest::Request& req, server::rest::Response& resp) {
const auto& queries = req.getQueries();
std::stringstream body;
body << "Queries:" << std::endl;
for (auto q : queries) {
body << q.first << "=" << q.second << std::endl;
}
resp.setBody(body.str());
});
...The websocket API is built upon a factory pattern, where the websocket session is implemented by the user of the siesta framework, see example below.
You will need a compiler supporting C++11 and C99, and CMake version 3.11 or newer. Ninja is the recommended build system.
If you need TLS support, set the SIESTA_ENABLE_TLS CMake variable to ON. This will make CMake download ARM mbedTLS upon configuration and enable TLS support for NNG.
Note: When using ARM mbedTLS, the license will change to Apache 2.0.
To build in a Linux environment:
$ mkdir build
$ cd build
$ cmake -GNinja ..
$ ninja
$ ninja test
#include <siesta/server.h>
#include <chrono>
#include <iostream>
#include <thread>
using namespace siesta;
int main(int argc, char** argv)
{
try {
// Use "https://...." for a secure server
auto server = server::createServer("http://127.0.0.1:9080");
server->start();
std::cout << "Server started, listening on port " << server->port()
<< std::endl;
server::TokenHolder h;
// Must hold on to the returned Token, otherwise the route will
// be removed when the Token is destroyed.
h += server->addRoute(
HttpMethod::GET,
"/",
[](const server::rest::Request&, server::rest::Response& resp) {
resp.setBody("Hello, World!");
});
// Run the server forever
while (true) {
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
return -1;
}
return 0;
}#include <siesta/client.h>
#include <chrono>
#include <iostream>
#include <thread>
using namespace siesta;
int main(int argc, char** argv)
{
try {
auto f = client::getRequest("http://127.0.0.1:9080/");
auto response = f.get();
std::cout << response << std::endl;
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
return -1;
}
return 0;
}#include <siesta/server.h>
using namespace siesta;
#include <chrono>
#include <iostream>
#include <thread>
int main(int argc, char** argv)
{
try {
if (argc < 2) {
std::cout << "Options: [address] base_path" << std::endl;
return 1;
}
std::string addr = "http://127.0.0.1";
const char* base_path = argv[1];
if (argc > 2) {
addr = argv[1];
base_path = argv[2];
}
auto server = server::createServer(addr);
server->start();
std::cout << "Server started, listening on port " << server->port()
<< std::endl;
server::TokenHolder h;
h += server->addDirectory("/", base_path);
std::cout << "Serving folder '" << base_path << "' under URI '/'" << std::endl;
while (true) {
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
return -1;
}
return 0;
}#include <siesta/server.h>
using namespace siesta;
#include <chrono>
#include <iostream>
#include <thread>
#include "ctrl_c_handler.h"
// Dummy struct to show how to supply a websocket connection with an "owner"
struct WebsocketData {
};
struct WebsocketConnection : server::websocket::Reader {
WebsocketData& owner;
server::websocket::Writer& writer;
WebsocketConnection(WebsocketData& owner, server::websocket::Writer& w)
: owner(owner), writer(w)
{
std::cout << "Stream connected (" << this << ")" << std::endl;
}
~WebsocketConnection()
{
std::cout << "Stream disconnected (" << this << ")" << std::endl;
}
void onMessage(const std::string& data) override
{
// Just echo back received data
std::cout << "Echoing back '" << data << "' (" << this << ")"
<< std::endl;
writer.send(data);
}
// The websocket factory method
static server::websocket::Reader* create(WebsocketData& owner,
server::websocket::Writer& w)
{
return new WebsocketConnection(owner, w);
}
};
int main(int argc, char** argv)
{
ctrlc::set_signal_handler();
try {
std::string addr = "http://127.0.0.1:9080";
if (argc > 1) {
addr = argv[1];
}
{
auto server = server::createServer(addr);
server->start();
std::cout << "Server started, listening on port " << server->port()
<< std::endl;
WebsocketData my_data;
auto token =
server->addTextWebsocket("/test",
std::bind(&WebsocketConnection::create,
my_data,
std::placeholders::_1));
while (!ctrlc::signalled()) {
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
}
std::cout << "Server stopped!" << std::endl;
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
return -1;
}
return 0;
}#include <siesta/client.h>
using namespace siesta;
#include <chrono>
#include <iostream>
#include <thread>
int main(int argc, char** argv)
{
try {
std::string addr = "ws://127.0.0.1:9080/test";
if (argc > 1) {
addr = argv[1];
}
auto on_open = [](client::websocket::Writer&) {
std::cout << "Client connected!" << std::endl;
};
auto on_close = [](client::websocket::Writer&,
const std::string& error) {
std::cout << "Error: " << error << std::endl;
};
auto on_close = [](client::websocket::Writer&) {
std::cout << "Client disconnected!" << std::endl;
};
auto on_message = [](client::websocket::Writer&,
const std::string& data) {
std::cout << "Received: " << data << std::endl;
};
auto client = client::websocket::connect(addr,
on_message,
on_open,
on_error,
on_close);
while (true) {
std::string input;
std::getline(std::cin, input);
client->send(input);
}
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
return 1;
}
return 0;
}
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