/**
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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.h"
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#include <thread>
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#include <utility>
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#include <vector>
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extern std::unordered_map<std::string, int> hws_map_;
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extern int fst_inc_wts_;
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extern float global_beam_, lattice_beam_, am_scale_;
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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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// feed buffer to asr engine for decoder
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void WebSocketServer::do_decoder(const std::vector<char>& buffer,
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websocketpp::connection_hdl& hdl,
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nlohmann::json& msg,
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websocketpp::lib::mutex& thread_lock,
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std::vector<std::vector<float>> &hotwords_embedding,
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std::string wav_name,
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bool itn,
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int audio_fs,
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std::string wav_format,
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FUNASR_DEC_HANDLE& decoder_handle) {
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try {
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int num_samples = buffer.size(); // the size of the buf
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if (!buffer.empty() && hotwords_embedding.size() > 0) {
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std::string asr_result="";
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std::string stamp_res="";
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std::string stamp_sents="";
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try{
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FUNASR_RESULT Result = FunOfflineInferBuffer(
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asr_handle, buffer.data(), buffer.size(), RASR_NONE, nullptr,
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hotwords_embedding, audio_fs, wav_format, itn, decoder_handle);
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if (Result != nullptr){
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asr_result = FunASRGetResult(Result, 0); // get decode result
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stamp_res = FunASRGetStamp(Result);
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stamp_sents = FunASRGetStampSents(Result);
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FunASRFreeResult(Result);
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} else{
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std::this_thread::sleep_for(std::chrono::milliseconds(20));
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LOG(ERROR) << "FUNASR_RESULT is nullptr.";
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}
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}catch (std::exception const& e) {
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LOG(ERROR) << e.what();
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}
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websocketpp::lib::error_code ec;
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nlohmann::json jsonresult; // result json
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jsonresult["text"] = asr_result; // put result in 'text'
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jsonresult["mode"] = "offline";
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jsonresult["is_final"] = false;
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if(stamp_res != ""){
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jsonresult["timestamp"] = stamp_res;
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}
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if(stamp_sents != ""){
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try{
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nlohmann::json json_stamp = nlohmann::json::parse(stamp_sents);
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jsonresult["stamp_sents"] = json_stamp;
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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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jsonresult["stamp_sents"] = "";
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}
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}
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jsonresult["wav_name"] = wav_name;
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// send the json to client
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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(), websocketpp::frame::opcode::text,
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ec);
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}
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LOG(INFO) << "buffer.size=" << buffer.size() << ",result json=" << jsonresult.dump();
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}else{
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LOG(INFO) << "Sent empty msg";
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websocketpp::lib::error_code ec;
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nlohmann::json jsonresult; // result json
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jsonresult["text"] = ""; // put result in 'text'
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jsonresult["mode"] = "offline";
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jsonresult["is_final"] = false;
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jsonresult["wav_name"] = wav_name;
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// send the json to client
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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(), websocketpp::frame::opcode::text,
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ec);
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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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scoped_lock guard(thread_lock);
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msg["access_num"]=(int)msg["access_num"]-1;
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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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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 = std::make_shared<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["wav_name"] = "wav-default-id";
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data_msg->msg["itn"] = true;
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data_msg->msg["audio_fs"] = 16000; // default is 16k
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data_msg->msg["access_num"] = 0; // the number of access for this object, when it is 0, we can free it saftly
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data_msg->msg["is_eof"]=false;
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FUNASR_DEC_HANDLE decoder_handle =
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FunASRWfstDecoderInit(asr_handle, ASR_OFFLINE, global_beam_, lattice_beam_, am_scale_);
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data_msg->decoder_handle = decoder_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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} else {
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return;
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}
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unique_lock guard_decoder(*(data_msg->thread_lock));
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data_msg->msg["is_eof"]=true;
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guard_decoder.unlock();
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LOG(INFO) << "on_close, active connections: " << data_map.size();
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}
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void remove_hdl(
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websocketpp::connection_hdl hdl,
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std::map<websocketpp::connection_hdl, std::shared_ptr<FUNASR_MESSAGE>,
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std::owner_less<websocketpp::connection_hdl>>& data_map) {
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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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} else {
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return;
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}
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unique_lock guard_decoder(*(data_msg->thread_lock));
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if (data_msg->msg["access_num"]==0 && data_msg->msg["is_eof"]==true) {
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FunWfstDecoderUnloadHwsRes(data_msg->decoder_handle);
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FunASRWfstDecoderUninit(data_msg->decoder_handle);
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data_msg->decoder_handle = nullptr;
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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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guard_decoder.unlock();
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}
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void WebSocketServer::check_and_clean_connection() {
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while(true){
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std::this_thread::sleep_for(std::chrono::milliseconds(5000));
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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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try{
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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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}
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catch (std::exception const &e)
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{
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// if connection is close, we set is_eof = true
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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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} else {
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continue;
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}
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unique_lock guard_decoder(*(data_msg->thread_lock));
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data_msg->msg["is_eof"]=true;
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guard_decoder.unlock();
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to_remove.push_back(hdl);
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LOG(INFO)<<"connection is closed.";
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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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{
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unique_lock lock(m_lock);
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remove_hdl(hdl, data_map);
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}
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}
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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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if(msg_data->msg["is_eof"]){
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lock.unlock();
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return;
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}
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} else{
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lock.unlock();
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return;
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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<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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unique_lock guard_decoder(*(thread_lock_p)); // mutex for one connection
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switch (msg->get_opcode()) {
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case websocketpp::frame::opcode::text: {
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nlohmann::json jsonresult;
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try{
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jsonresult = nlohmann::json::parse(payload);
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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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msg_data->msg["is_eof"]=true;
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guard_decoder.unlock();
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return;
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}
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if (jsonresult["wav_name"] != nullptr) {
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msg_data->msg["wav_name"] = jsonresult["wav_name"];
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}
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if (jsonresult["wav_format"] != nullptr) {
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msg_data->msg["wav_format"] = jsonresult["wav_format"];
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}
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// hotwords: fst/nn
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if(msg_data->hotwords_embedding == nullptr){
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std::unordered_map<std::string, int> merged_hws_map;
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std::string nn_hotwords = "";
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if (jsonresult["hotwords"] != nullptr) {
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std::string json_string = jsonresult["hotwords"];
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if (!json_string.empty()){
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nlohmann::json json_fst_hws;
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try{
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json_fst_hws = nlohmann::json::parse(json_string);
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if(json_fst_hws.type() == nlohmann::json::value_t::object){
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// fst
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try{
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std::unordered_map<std::string, int> client_hws_map = json_fst_hws;
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merged_hws_map.insert(client_hws_map.begin(), client_hws_map.end());
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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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} catch (std::exception const &e)
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{
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LOG(ERROR)<<e.what();
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// nn
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std::string client_nn_hws = jsonresult["hotwords"];
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nn_hotwords += " " + client_nn_hws;
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// LOG(INFO) << "nn hotwords: " << client_nn_hws;
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}
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}
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}
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merged_hws_map.insert(hws_map_.begin(), hws_map_.end());
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// fst
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LOG(INFO) << "hotwords: ";
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for (const auto& pair : merged_hws_map) {
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nn_hotwords += " " + pair.first;
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LOG(INFO) << pair.first << " : " << pair.second;
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}
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FunWfstDecoderLoadHwsRes(msg_data->decoder_handle, fst_inc_wts_, merged_hws_map);
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// nn
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std::vector<std::vector<float>> new_hotwords_embedding= CompileHotwordEmbedding(asr_handle, nn_hotwords);
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msg_data->hotwords_embedding =
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std::make_shared<std::vector<std::vector<float>>>(new_hotwords_embedding);
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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("itn")) {
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msg_data->msg["itn"] = jsonresult["itn"];
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}
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if ((jsonresult["is_speaking"] == false ||
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jsonresult["is_finished"] == true) &&
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msg_data->msg["is_eof"] != true &&
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msg_data->hotwords_embedding != nullptr) {
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LOG(INFO) << "client done";
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// for offline, send all receive data to decoder engine
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std::vector<std::vector<float>> hotwords_embedding_(*(msg_data->hotwords_embedding));
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asio::post(io_decoder_,
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std::bind(&WebSocketServer::do_decoder, this,
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std::move(*(sample_data_p.get())),
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std::move(hdl),
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std::ref(msg_data->msg),
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std::ref(*thread_lock_p),
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std::move(hotwords_embedding_),
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msg_data->msg["wav_name"],
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msg_data->msg["itn"],
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msg_data->msg["audio_fs"],
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msg_data->msg["wav_format"],
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std::ref(msg_data->decoder_handle)));
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msg_data->msg["access_num"]=(int)(msg_data->msg["access_num"])+1;
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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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// TODO
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} else {
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// for offline, we add receive data to end of the sample data vector
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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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guard_decoder.unlock();
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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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// init model with api
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asr_handle = FunOfflineInit(model_path, thread_num);
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LOG(INFO) << "model successfully inited";
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LOG(INFO) << "initAsr run check_and_clean_connection";
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std::thread clean_thread(&WebSocketServer::check_and_clean_connection,this);
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clean_thread.detach();
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LOG(INFO) << "initAsr run check_and_clean_connection finished";
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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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