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/* LWS-releated functions.

* Author: Steffen Vogel <post@steffenvogel.de>

* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University

* SPDX-License-Identifier: Apache-2.0

#include <cstring>

#include <villas/api.hpp>

#include <villas/api/session.hpp>

#include <villas/config.hpp>

#include <villas/node/config.hpp>

#include <villas/node/exceptions.hpp>

#include <villas/nodes/websocket.hpp>

#include <villas/utils.hpp>

#include <villas/web.hpp>

#ifdef WITH_NODE_WEBRTC

#include <villas/nodes/webrtc/signaling_client.hpp>

#endif

using namespace villas;

using namespace villas::node;

// Forward declarations

lws_callback_function villas::node::websocket_protocol_cb;

// List of libwebsockets protocols.

lws_protocols protocols[] = {

{.name = "http",

.callback = lws_callback_http_dummy,

.per_session_data_size = 0,

.rx_buffer_size = 1024},

#ifdef WITH_API

{.name = "http-api",

.callback = api::Session::protocolCallback,

.per_session_data_size = sizeof(api::Session),

.rx_buffer_size = 1024},

#endif // WITH_API

#ifdef WITH_NODE_WEBSOCKET

{.name = "live",

.callback = websocket_protocol_cb,

.per_session_data_size = sizeof(websocket_connection),

.rx_buffer_size = 0},

#endif // WITH_NODE_WEBSOCKET

#ifdef WITH_NODE_WEBRTC

{.name = "webrtc-signaling",

.callback = webrtc::SignalingClient::protocolCallback,

.rx_buffer_size = 0},

#endif

{

.name = nullptr,

}};

// List of libwebsockets mounts.

static lws_http_mount mounts[] = {

#ifdef WITH_API

{

.mount_next = nullptr, // linked-list "next"

.mountpoint = "/api/v2", // mountpoint URL

.origin = "http-api", // protocol

.def = nullptr,

.protocol = "http-api",

.cgienv = nullptr,

.extra_mimetypes = nullptr,

.interpret = nullptr,

.cgi_timeout = 0,

.cache_max_age = 0,

.auth_mask = 0,

.cache_reusable = 0,

.cache_revalidate = 0,

.cache_intermediaries = 0,

.origin_protocol = LWSMPRO_CALLBACK, // dynamic

.mountpoint_len = 7 // char count

}

#endif // WITH_API

};

// List of libwebsockets extensions.

static const lws_extension extensions[] = {

#ifdef LWS_DEFLATE_FOUND

{.name = "permessage-deflate",

.callback = lws_extension_callback_pm_deflate,

.client_offer = "permessage-deflate"},

{.name = "deflate-frame",

.callback = lws_extension_callback_pm_deflate,

.client_offer = "deflate_frame"},

#endif // LWS_DEFLATE_FOUND

{nullptr /* terminator */}};

void Web::lwsLogger(int lws_lvl, const char *msg) {

char *nl;

nl = (char *)strchr(msg, '\n');

if (nl)

*nl = 0;

// Decrease severity for some errors

if (strstr(msg, "Unable to open") == msg)

lws_lvl = LLL_WARN;

Logger logger = Log::get("lws");

switch (lws_lvl) {

case LLL_ERR:

logger->error("{}", msg);

break;

case LLL_WARN:

logger->warn("{}", msg);

break;

case LLL_NOTICE:

case LLL_INFO:

logger->info("{}", msg);

break;

default: // Everything else is debug

logger->debug("{}", msg);

}

int Web::lwsLogLevel(Log::Level lvl) {

int lwsLvl = 0;

switch (lvl) {

case Log::Level::trace:

LLL_HEADER | LLL_PARSER;

case Log::Level::debug:

lwsLvl |= LLL_DEBUG | LLL_NOTICE | LLL_INFO;

case Log::Level::info:

case Log::Level::warn:

lwsLvl |= LLL_WARN;

case Log::Level::err:

lwsLvl |= LLL_ERR;

case Log::Level::critical:

case Log::Level::off:

default: {

}

return lwsLvl;

}

void Web::worker() {

logger->info("Started worker");

while (running) {

lws_service(context, 0);

while (!writables.empty()) {

auto *wsi = writables.pop();

lws_callback_on_writable(wsi);

}

logger->info("Stopped worker");

}

Web::Web(Api *a)

: state(State::INITIALIZED), logger(Log::get("web")), context(nullptr),

vhost(nullptr), port(getuid() > 0 ? 8080 : 80), api(a) {

lws_set_log_level(lwsLogLevel(Log::getInstance().getLevel()), lwsLogger);

}

Web::~Web() {

if (state == State::STARTED)

stop();

}

int Web::parse(json_t *json) {

int ret, enabled = 1;

const char *cert = nullptr;

const char *pkey = nullptr;

json_error_t err;

ret = json_unpack_ex(

json, &err, JSON_STRICT, "{ s?: s, s?: s, s?: i, s?: b }", "ssl_cert",

&cert, "ssl_private_key", &pkey, "port", &port, "enabled", &enabled);

if (ret)

throw ConfigError(json, err, "node-config-http");

if (cert)

ssl_cert = cert;

if (pkey)

ssl_private_key = pkey;

if (!enabled)

port = CONTEXT_PORT_NO_LISTEN;

state = State::PARSED;

return 0;

}

void Web::start() {

// Start server

lws_context_creation_info ctx_info;

memset(&ctx_info, 0, sizeof(ctx_info));

ctx_info.port = port;

ctx_info.protocols = protocols;

#ifndef LWS_WITHOUT_EXTENSIONS

ctx_info.extensions = extensions;

#endif

ctx_info.ssl_cert_filepath = ssl_cert.empty() ? nullptr : ssl_cert.c_str();

ctx_info.ssl_private_key_filepath =

ssl_private_key.empty() ? nullptr : ssl_private_key.c_str();

ctx_info.gid = -1;

ctx_info.uid = -1;

ctx_info.options =

LWS_SERVER_OPTION_EXPLICIT_VHOSTS | LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;

ctx_info.user = (void *)this;

#if LWS_LIBRARY_VERSION_NUMBER <= 3000000

// See: https://github.com/warmcat/libwebsockets/issues/1249

ctx_info.max_http_header_pool = 1024;

#endif

ctx_info.mounts = mounts;

logger->info("Starting sub-system");

context = lws_create_context(&ctx_info);

if (context == nullptr)

throw RuntimeError("Failed to initialize server context");

for (int tries = 10; tries > 0; tries--) {

vhost = lws_create_vhost(context, &ctx_info);

if (vhost)

break;

ctx_info.port++;

logger->warn("Failed to setup vhost. Trying another port: {}",

ctx_info.port);

}

if (vhost == nullptr)

throw RuntimeError("Failed to initialize virtual host");

// Start thread

running = true;

thread = std::thread(&Web::worker, this);

state = State::STARTED;

}

void Web::stop() {

assert(state == State::STARTED);

logger->info("Stopping sub-system");

running = false;

lws_cancel_service(context);

thread.join();

lws_context_destroy(context);

state = State::STOPPED;

}

void Web::callbackOnWritable(lws *wsi) {

writables.push(wsi);

lws_cancel_service(context);

}

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