/**
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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 "websocketsrv.h"
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#include <thread>
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#include <utility>
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#include <vector>
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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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try {
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int num_samples = buffer.size(); // the size of the buf
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if (!buffer.empty()) {
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// fout.write(buffer.data(), buffer.size());
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// feed data to asr engine
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FUNASR_RESULT Result = FunOfflineInferBuffer(
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asr_hanlde, buffer.data(), buffer.size(), RASR_NONE, NULL, 16000);
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std::string asr_result =
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((FUNASR_RECOG_RESULT*)Result)->msg; // get decode result
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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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// send the json to client
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server_->send(hdl, jsonresult.dump(), websocketpp::frame::opcode::text,
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ec);
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std::cout << "buffer.size=" << buffer.size()
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<< ",result json=" << jsonresult.dump() << std::endl;
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if (!isonline) {
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// close the client if it is not online asr
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server_->close(hdl, websocketpp::close::status::normal, "DONE", ec);
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// fout.close();
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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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sample_map.emplace(
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hdl, std::make_shared<std::vector<char>>()); // put a new data vector for
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// new connection
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std::cout << "on_open, active connections: " << sample_map.size()
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<< std::endl;
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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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sample_map.erase(hdl); // remove data vector when connection is closed
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std::cout << "on_close, active connections: " << sample_map.size()
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<< std::endl;
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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 = sample_map.begin();
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while (iter != sample_map.end()) { // loop to find closed connection
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websocketpp::connection_hdl hdl = iter->first;
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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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iter++;
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}
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for (auto hdl : to_remove) {
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sample_map.erase(hdl);
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std::cout << "remove one connection " << std::endl;
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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<std::vector<char>> sample_data_p = nullptr;
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auto it = sample_map.find(hdl);
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if (it != sample_map.end()) {
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sample_data_p = it->second;
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}
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lock.unlock();
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if (sample_data_p == nullptr) {
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std::cout << "error when fetch sample data vector" << std::endl;
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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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if (payload == "Done") {
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std::cout << "client done" << std::endl;
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if (isonline) {
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// do_close(ws);
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} else {
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// for offline, send all receive data to decoder engine
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asio::post(io_decoder_, 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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}
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}
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break;
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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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// if online TODO(zhaoming) still not done
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std::vector<char> s(pcm_data, pcm_data + num_samples);
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asio::post(io_decoder_, std::bind(&WebSocketServer::do_decoder, this,
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std::move(s), std::move(hdl)));
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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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}
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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_hanlde = FunOfflineInit(model_path, thread_num);
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std::cout << "model ready" << std::endl;
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} catch (const std::exception& e) {
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std::cout << e.what() << std::endl;
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}
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}
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