/**
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* Copyright FunASR (https://github.com/alibaba-damo-academy/FunASR). All Rights
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* Reserved. MIT License (https://opensource.org/licenses/MIT)
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*/
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/* 2022-2023 by zhaomingwork */
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// websocket server for asr engine
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// take some ideas from https://github.com/k2-fsa/sherpa-onnx
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// online-websocket-server-impl.cc, thanks. The websocket server has two threads
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// pools, one for handle network data and one for asr decoder.
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// now only support offline engine.
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#include "websocket-server-2pass.h"
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#include <thread>
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#include <utility>
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#include <vector>
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context_ptr WebSocketServer::on_tls_init(tls_mode mode,
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websocketpp::connection_hdl hdl,
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std::string& s_certfile,
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std::string& s_keyfile) {
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namespace asio = websocketpp::lib::asio;
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LOG(INFO) << "on_tls_init called with hdl: " << hdl.lock().get();
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LOG(INFO) << "using TLS mode: "
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<< (mode == MOZILLA_MODERN ? "Mozilla Modern"
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: "Mozilla Intermediate");
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context_ptr ctx = websocketpp::lib::make_shared<asio::ssl::context>(
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asio::ssl::context::sslv23);
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try {
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if (mode == MOZILLA_MODERN) {
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// Modern disables TLSv1
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ctx->set_options(
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asio::ssl::context::default_workarounds |
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asio::ssl::context::no_sslv2 | asio::ssl::context::no_sslv3 |
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asio::ssl::context::no_tlsv1 | asio::ssl::context::single_dh_use);
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} else {
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ctx->set_options(asio::ssl::context::default_workarounds |
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asio::ssl::context::no_sslv2 |
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asio::ssl::context::no_sslv3 |
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asio::ssl::context::single_dh_use);
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}
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ctx->use_certificate_chain_file(s_certfile);
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ctx->use_private_key_file(s_keyfile, asio::ssl::context::pem);
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} catch (std::exception& e) {
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LOG(INFO) << "Exception: " << e.what();
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}
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return ctx;
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}
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nlohmann::json handle_result(FUNASR_RESULT result, std::string& online_res,
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std::string& tpass_res, nlohmann::json msg) {
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websocketpp::lib::error_code ec;
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nlohmann::json jsonresult;
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jsonresult["text"]="";
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std::string tmp_online_msg = FunASRGetResult(result, 0);
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online_res += tmp_online_msg;
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if (tmp_online_msg != "") {
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LOG(INFO) << "online_res :" << tmp_online_msg;
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jsonresult["text"] = tmp_online_msg;
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jsonresult["mode"] = "2pass-online";
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}
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std::string tmp_tpass_msg = FunASRGetTpassResult(result, 0);
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tpass_res += tmp_tpass_msg;
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if (tmp_tpass_msg != "") {
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LOG(INFO) << "offline results : " << tmp_tpass_msg;
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jsonresult["text"] = tmp_tpass_msg;
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jsonresult["mode"] = "2pass-offline";
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}
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if (msg.contains("wav_name")) {
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jsonresult["wav_name"] = msg["wav_name"];
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}
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return jsonresult;
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}
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// feed buffer to asr engine for decoder
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void WebSocketServer::do_decoder(
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std::vector<char>& buffer, websocketpp::connection_hdl& hdl,
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nlohmann::json& msg, std::vector<std::vector<std::string>>& punc_cache,
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websocketpp::lib::mutex& thread_lock, bool& is_final,
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FUNASR_HANDLE& tpass_online_handle, std::string& online_res,
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std::string& tpass_res) {
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// lock for each connection
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scoped_lock guard(thread_lock);
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FUNASR_RESULT Result = nullptr;
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int asr_mode_ = 2;
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if (msg.contains("mode")) {
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std::string modeltype = msg["mode"];
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if (modeltype == "offline") {
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asr_mode_ = 0;
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} else if (modeltype == "online") {
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asr_mode_ = 1;
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} else if (modeltype == "2pass") {
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asr_mode_ = 2;
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}
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} else {
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// default value
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msg["mode"] = "2pass";
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asr_mode_ = 2;
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}
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try {
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// loop to send chunk_size 800*2 data to asr engine. TODO: chunk_size need get from client
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while (buffer.size() >= 800 * 2) {
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std::vector<char> subvector = {buffer.begin(),
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buffer.begin() + 800 * 2};
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buffer.erase(buffer.begin(), buffer.begin() + 800 * 2);
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try{
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Result =
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FunTpassInferBuffer(tpass_handle, tpass_online_handle,
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subvector.data(), subvector.size(), punc_cache,
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false, msg["audio_fs"], msg["wav_format"], (ASR_TYPE)asr_mode_);
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}catch (std::exception const &e)
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{
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LOG(ERROR)<<e.what();
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}
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if (Result) {
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websocketpp::lib::error_code ec;
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nlohmann::json jsonresult =
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handle_result(Result, online_res, tpass_res, msg["wav_name"]);
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jsonresult["is_final"] = false;
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if(jsonresult["text"] != "") {
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if (is_ssl) {
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wss_server_->send(hdl, jsonresult.dump(),
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websocketpp::frame::opcode::text, ec);
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} else {
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server_->send(hdl, jsonresult.dump(),
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websocketpp::frame::opcode::text, ec);
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}
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}
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FunASRFreeResult(Result);
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}
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}
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if(is_final){
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try{
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Result = FunTpassInferBuffer(tpass_handle, tpass_online_handle,
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buffer.data(), buffer.size(), punc_cache,
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is_final, msg["audio_fs"], msg["wav_format"], (ASR_TYPE)asr_mode_);
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}catch (std::exception const &e)
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{
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LOG(ERROR)<<e.what();
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}
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for(auto &vec:punc_cache){
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vec.clear();
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}
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if (Result) {
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websocketpp::lib::error_code ec;
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nlohmann::json jsonresult =
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handle_result(Result, online_res, tpass_res, msg["wav_name"]);
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jsonresult["is_final"] = true;
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if (is_ssl) {
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wss_server_->send(hdl, jsonresult.dump(),
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websocketpp::frame::opcode::text, ec);
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} else {
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server_->send(hdl, jsonresult.dump(),
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websocketpp::frame::opcode::text, ec);
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}
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FunASRFreeResult(Result);
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}
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}
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} catch (std::exception const& e) {
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std::cerr << "Error: " << e.what() << std::endl;
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}
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}
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void WebSocketServer::on_open(websocketpp::connection_hdl hdl) {
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scoped_lock guard(m_lock); // for threads safty
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check_and_clean_connection(); // remove closed connection
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std::shared_ptr<FUNASR_MESSAGE> data_msg =
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std::make_shared<FUNASR_MESSAGE>(); // put a new data vector for new
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// connection
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data_msg->samples = std::make_shared<std::vector<char>>();
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data_msg->thread_lock = new websocketpp::lib::mutex();
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data_msg->msg = nlohmann::json::parse("{}");
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data_msg->msg["wav_format"] = "pcm";
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data_msg->msg["audio_fs"] = 16000;
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data_msg->punc_cache =
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std::make_shared<std::vector<std::vector<std::string>>>(2);
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// std::vector<int> chunk_size = {5, 10, 5}; //TODO, need get from client
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// FUNASR_HANDLE tpass_online_handle =
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// FunTpassOnlineInit(tpass_handle, chunk_size);
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// data_msg->tpass_online_handle = tpass_online_handle;
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data_map.emplace(hdl, data_msg);
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LOG(INFO) << "on_open, active connections: " << data_map.size();
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}
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void WebSocketServer::on_close(websocketpp::connection_hdl hdl) {
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scoped_lock guard(m_lock);
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std::shared_ptr<FUNASR_MESSAGE> data_msg = nullptr;
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auto it_data = data_map.find(hdl);
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if (it_data != data_map.end()) {
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data_msg = it_data->second;
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}
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else
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{
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return;
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}
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scoped_lock guard_decoder(*(data_msg->thread_lock)); //wait for do_decoder finished and avoid access freed tpass_online_handle
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FunTpassOnlineUninit(data_msg->tpass_online_handle);
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data_map.erase(hdl); // remove data vector when connection is closed
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LOG(INFO) << "on_close, active connections: "<< data_map.size();
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}
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// remove closed connection
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void WebSocketServer::check_and_clean_connection() {
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std::vector<websocketpp::connection_hdl> to_remove; // remove list
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auto iter = data_map.begin();
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while (iter != data_map.end()) { // loop to find closed connection
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websocketpp::connection_hdl hdl = iter->first;
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if (is_ssl) {
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wss_server::connection_ptr con = wss_server_->get_con_from_hdl(hdl);
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if (con->get_state() != 1) { // session::state::open ==1
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to_remove.push_back(hdl);
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}
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} else {
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server::connection_ptr con = server_->get_con_from_hdl(hdl);
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if (con->get_state() != 1) { // session::state::open ==1
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to_remove.push_back(hdl);
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}
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}
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iter++;
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}
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for (auto hdl : to_remove) {
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data_map.erase(hdl);
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LOG(INFO) << "remove one connection ";
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}
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}
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void WebSocketServer::on_message(websocketpp::connection_hdl hdl,
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message_ptr msg) {
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unique_lock lock(m_lock);
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// find the sample data vector according to one connection
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std::shared_ptr<FUNASR_MESSAGE> msg_data = nullptr;
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auto it_data = data_map.find(hdl);
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if (it_data != data_map.end()) {
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msg_data = it_data->second;
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}
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std::shared_ptr<std::vector<char>> sample_data_p = msg_data->samples;
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std::shared_ptr<std::vector<std::vector<std::string>>> punc_cache_p =
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msg_data->punc_cache;
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websocketpp::lib::mutex* thread_lock_p = msg_data->thread_lock;
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lock.unlock();
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if (sample_data_p == nullptr) {
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LOG(INFO) << "error when fetch sample data vector";
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return;
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}
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const std::string& payload = msg->get_payload(); // get msg type
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switch (msg->get_opcode()) {
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case websocketpp::frame::opcode::text: {
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nlohmann::json jsonresult = nlohmann::json::parse(payload);
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if (jsonresult.contains("wav_name")) {
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msg_data->msg["wav_name"] = jsonresult["wav_name"];
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}
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if (jsonresult.contains("mode")) {
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msg_data->msg["mode"] = jsonresult["mode"];
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}
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if (jsonresult.contains("wav_format")) {
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msg_data->msg["wav_format"] = jsonresult["wav_format"];
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}
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if (jsonresult.contains("audio_fs")) {
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msg_data->msg["audio_fs"] = jsonresult["audio_fs"];
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}
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if (jsonresult.contains("chunk_size")){
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if(msg_data->tpass_online_handle == NULL){
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std::vector<int> chunk_size_vec = jsonresult["chunk_size"].get<std::vector<int>>();
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FUNASR_HANDLE tpass_online_handle =
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FunTpassOnlineInit(tpass_handle, chunk_size_vec);
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msg_data->tpass_online_handle = tpass_online_handle;
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}
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}
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LOG(INFO) << "jsonresult=" << jsonresult << ", msg_data->msg="
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<< msg_data->msg;
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if (jsonresult["is_speaking"] == false ||
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jsonresult["is_finished"] == true) {
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LOG(INFO) << "client done";
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// if it is in final message, post the sample_data to decode
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asio::post(
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io_decoder_,
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std::bind(&WebSocketServer::do_decoder, this,
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std::move(*(sample_data_p.get())), std::move(hdl),
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std::ref(msg_data->msg), std::ref(*(punc_cache_p.get())),
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std::ref(*thread_lock_p), std::move(true),
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std::ref(msg_data->tpass_online_handle),
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std::ref(msg_data->online_res),
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std::ref(msg_data->tpass_res)));
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}
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break;
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}
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case websocketpp::frame::opcode::binary: {
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// recived binary data
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const auto* pcm_data = static_cast<const char*>(payload.data());
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int32_t num_samples = payload.size();
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if (isonline) {
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sample_data_p->insert(sample_data_p->end(), pcm_data,
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pcm_data + num_samples);
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int setpsize = 800 * 2; // TODO, need get from client
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// if sample_data size > setpsize, we post data to decode
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if (sample_data_p->size() > setpsize) {
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int chunksize = floor(sample_data_p->size() / setpsize);
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// make sure the subvector size is an integer multiple of setpsize
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std::vector<char> subvector = {
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sample_data_p->begin(),
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sample_data_p->begin() + chunksize * setpsize};
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// keep remain in sample_data
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sample_data_p->erase(sample_data_p->begin(),
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sample_data_p->begin() + chunksize * setpsize);
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// post to decode
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asio::post(io_decoder_,
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std::bind(&WebSocketServer::do_decoder, this,
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std::move(subvector), std::move(hdl),
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std::ref(msg_data->msg),
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std::ref(*(punc_cache_p.get())),
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std::ref(*thread_lock_p), std::move(false),
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std::ref(msg_data->tpass_online_handle),
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std::ref(msg_data->online_res),
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std::ref(msg_data->tpass_res)));
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}
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} else {
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sample_data_p->insert(sample_data_p->end(), pcm_data,
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pcm_data + num_samples);
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}
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break;
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}
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default:
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break;
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}
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}
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// init asr model
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void WebSocketServer::initAsr(std::map<std::string, std::string>& model_path,
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int thread_num) {
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try {
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tpass_handle = FunTpassInit(model_path, thread_num);
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if (!tpass_handle) {
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LOG(ERROR) << "FunTpassInit init failed";
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exit(-1);
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}
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} catch (const std::exception& e) {
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LOG(INFO) << e.what();
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}
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}
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