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session.h
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#ifndef ALEXAAGENT__SESSION_H
#define ALEXAAGENT__SESSION_H
#include <deque>
#include <ostream>
#include <boost/asio/system_timer.hpp>
#include <nghttp2/asio_http2_client.h>
#include "json.h"
#include "multipart.h"
#include "audio.h"
#include "scheduler.h"
enum t_severity
{
e_severity__TRACE,
e_severity__INFORMATION,
e_severity__ERROR,
e_severity__NEVER
};
class t_session
{
struct t_channel
{
t_task& v_task;
t_audio_target v_target;
std::deque<std::function<void()>> v_directives;
std::string v_playing;
t_channel(t_task& a_task) : v_task(a_task)
{
}
long f_offset() const
{
return v_target.f_offset() * 1000.0;
}
void f_queue(std::function<void()>&& a_directive)
{
v_directives.push_back(std::move(a_directive));
v_task.f_notify();
}
void f_clear()
{
v_directives.clear();
}
void f_run()
{
while (true) {
while (v_directives.empty()) v_task.f_wait();
auto directive = std::move(v_directives.front());
v_directives.pop_front();
directive();
}
}
void f_loop(t_audio_decoder& a_decoder)
{
a_decoder([this](size_t a_channels, size_t a_bytes, const char* a_p, size_t a_n, size_t a_rate)
{
auto queued = v_target(a_channels, a_bytes, a_p, a_n, a_rate);
while (queued > 32) {
v_task.f_wait(std::chrono::milliseconds(static_cast<int>(v_target.f_remain() * 500.0)));
queued = v_target.f_flush();
}
});
}
void f_flush()
{
while (v_target.f_flush() > 0) v_task.f_wait(std::chrono::milliseconds(static_cast<int>(v_target.f_remain() * 500.0)));
}
void f_stop()
{
if (v_playing.empty()) return;
v_target.f_stop();
v_task.f_post([](auto)
{
throw nullptr;
});
}
};
public:
class t_alert
{
friend class t_session;
std::string v_type;
std::string v_at;
std::unique_ptr<boost::asio::system_timer> v_timer;
std::function<void(bool)> v_play;
t_alert(const std::string& a_type, const std::string& a_at) : v_type(a_type), v_at(a_at)
{
}
void f_cancel()
{
v_type.clear();
v_timer->cancel();
}
public:
const std::string& f_type() const
{
return v_type;
}
const std::string& f_at() const
{
return v_at;
}
bool f_active() const
{
return static_cast<bool>(v_play);
}
};
private:
struct t_parser;
struct t_attached_audio
{
t_session& v_session;
t_task& v_task;
std::map<std::string, t_attached_audio*>::iterator v_i;
boost::asio::streambuf v_data;
bool v_finished = false;
t_parser* v_parser = nullptr;
t_attached_audio(t_session& a_session, t_task& a_task, const std::string& a_id) : v_session(a_session), v_task(a_task), v_i(v_session.v_id2audio.emplace(a_id, this).first)
{
}
~t_attached_audio()
{
v_session.v_id2audio.erase(v_i);
if (!v_parser) return;
v_parser->v_content = &t_parser::f_ignore_content;
v_parser->v_finish = &t_parser::f_ignore_finish;
}
t_audio_source* f_open(std::function<void()>&& a_stuttering, std::function<void()>&& a_stuttered)
{
return new t_callback_audio_source([this, a_stuttering = std::move(a_stuttering), a_stuttered = std::move(a_stuttered)](auto a_p, auto a_n)
{
if (v_data.size() <= 0) {
if (v_finished) return 0;
v_task.f_wait();
if (v_data.size() <= 0) {
if (v_finished) return 0;
a_stuttering();
do v_task.f_wait(); while (v_data.size() <= 0 && !v_finished);
a_stuttered();
if (v_data.size() <= 0) return 0;
}
}
int n = boost::asio::buffer_copy(boost::asio::buffer(a_p, a_n), v_data.data());
v_data.consume(n);
return n;
});
}
};
struct t_parser
{
t_session& v_session;
t_multipart<t_parser> v_multipart;
void (t_parser::*v_content)(const char*, size_t);
void (t_parser::*v_finish)() = &t_parser::f_ignore_finish;
boost::asio::streambuf v_metadata;
t_attached_audio* v_audio;
t_parser(t_session& a_session, const std::string& a_boundary) : v_session(a_session), v_multipart(*this, a_boundary)
{
}
void f_json_content(const char* a_p, size_t a_n)
{
v_metadata.sputn(a_p, a_n);
}
void f_json_finish()
{
picojson::value directive;
picojson::parse(directive, std::istreambuf_iterator<char>(&v_metadata), std::istreambuf_iterator<char>(), nullptr);
if (v_session.v_log) v_session.v_log(e_severity__TRACE) << "json: " << directive.serialize(true) << std::endl;
auto& header = directive / "directive" / "header";
auto ns = header / "namespace"_jss;
auto name = header / "name"_jss;
if (v_session.v_log) v_session.v_log(e_severity__INFORMATION) << "parser(" << this << ") directive: " << ns + "." << name << std::endl;
try {
v_session.v_handlers.at({ns, name})(directive);
} catch (std::exception& e) {
v_session.f_exception_encountered(ns + '.' + name, "UNSUPPORTED_OPERATION", e.what());
}
}
void f_audio_content(const char* a_p, size_t a_n)
{
boost::asio::buffer_copy(v_audio->v_data.prepare(a_n), boost::asio::buffer(a_p, a_n));
v_audio->v_data.commit(a_n);
v_audio->v_task.f_notify();
}
void f_audio_finish()
{
v_audio->v_parser = nullptr;
v_audio->v_finished = true;
v_audio->v_task.f_notify();
}
void f_ignore_content(const char* a_p, size_t a_n)
{
}
void f_ignore_finish()
{
}
void f_boundary()
{
(this->*v_finish)();
}
void f_part(const std::string& a_type, const std::string& a_id)
{
if (v_session.v_log) v_session.v_log(e_severity__TRACE) << "parser(" << this << ") part: " << a_type << ", " << a_id << std::endl;
if (a_type == "application/json") {
v_content = &t_parser::f_json_content;
v_finish = &t_parser::f_json_finish;
return;
} else if (a_type == "application/octet-stream") {
auto i = v_session.v_id2audio.find(a_id);
if (i != v_session.v_id2audio.end()) {
v_audio = i->second;
v_content = &t_parser::f_audio_content;
v_finish = &t_parser::f_audio_finish;
v_audio->v_parser = this;
return;
}
}
v_content = &t_parser::f_ignore_content;
v_finish = &t_parser::f_ignore_finish;
}
void f_content(const char* a_p, size_t a_n)
{
(this->*v_content)(a_p, a_n);
}
void operator()(const uint8_t* a_p, size_t a_n)
{
for (; a_n > 0; --a_n) v_multipart(*a_p++);
}
};
friend struct t_parser;
const std::string v_boundary_metadata =
"--this-is-a-boundary\r\n"
"Content-Disposition: form-data; name=\"metadata\"\r\n"
"Content-Type: application/json; charset=UTF-8\r\n\r\n";
const std::string v_boundary_audio =
"\r\n--this-is-a-boundary\r\n"
"Content-Disposition: form-data; name=\"audio\"\r\n"
"Content-Type: application/octet-stream\r\n\r\n";
const std::string v_boundary_terminator = "\r\n--this-is-a-boundary--\r\n";
const std::regex v_re_content_type{"\\s*multipart/related\\s*;\\s*boundary\\s*=\\s*([\\-0-9A-Za-z]+).*"};
boost::asio::ssl::context v_tls;
t_scheduler& v_scheduler;
nghttp2::asio_http2::header_map v_header;
std::function<std::function<void(bool)>(const std::string&)> v_open_sound;
std::unique_ptr<nghttp2::asio_http2::client::session> v_session;
bool v_online = false;
boost::asio::steady_timer* v_reconnecting = nullptr;
size_t v_reconnecting_interval = 1;
size_t v_message_id = 0;
size_t v_dialog_id = 0;
std::map<std::pair<std::string, std::string>, std::function<void(const picojson::value&)>> v_handlers{
{{"SpeechRecognizer", "ExpectSpeech"}, [this](auto a_directive)
{
auto& payload = a_directive / "directive" / "payload";
v_dialog->f_queue([this, dialog_id = a_directive / "directive" / "header" * "dialogRequestId" | std::string(), timeout = static_cast<int>((payload / "timeoutInMilliseconds"_jsn))]
{
v_expecting_dialog_id = dialog_id;
v_expecting_speech = [this, timeout]
{
this->f_dialog_acquire(*v_recognizer);
if (v_log) v_log(e_severity__INFORMATION) << "dialog(" << v_expecting_dialog_id << ") expecting speech within " << timeout << " ms." << std::endl;
v_expecting_timeout = &v_scheduler.f_run_in(std::chrono::milliseconds(timeout), [this](auto a_ec)
{
if (!v_expecting_speech) return;
v_expecting_speech = nullptr;
v_expecting_timeout = nullptr;
this->f_empty_event("SpeechRecognizer", "ExpectSpeechTimedOut");
this->f_dialog_release();
if (v_state_changed) v_state_changed();
});
if (v_state_changed) v_state_changed();
};
do v_dialog->v_task.f_wait(); while (v_expecting_speech);
});
}},
{{"Alerts", "SetAlert"}, [this](auto a_directive)
{
auto& payload = a_directive / "directive" / "payload";
auto token = payload / "token"_jss;
try {
this->f_alerts_set(token, payload / "type"_jss, payload / "scheduledTime"_jss);
if (v_alerts_changed) v_alerts_changed();
this->f_alerts_event("SetAlertSucceeded", token);
} catch (std::exception& e) {
this->f_exception_encountered("Alerts.SetAlert", "INTERNAL_ERROR", e.what());
this->f_alerts_event("SetAlertFailed", token);
}
}},
{{"Alerts", "DeleteAlert"}, [this](auto a_directive)
{
auto& payload = a_directive / "directive" / "payload";
auto token = payload / "token"_jss;
try {
this->f_alerts_delete(token);
if (v_alerts_changed) v_alerts_changed();
this->f_alerts_event("DeleteAlertSucceeded", token);
} catch (std::exception& e) {
this->f_exception_encountered("Alerts.DeleteAlert", "INTERNAL_ERROR", e.what());
this->f_alerts_event("DeleteAlertFailed", token);
}
}},
{{"AudioPlayer", "Play"}, [this](const picojson::value& a_directive)
{
auto& payload = a_directive / "directive" / "payload";
auto behavior = payload / "playBehavior"_jss;
if (behavior == "REPLACE_ALL") {
v_content->f_clear();
v_content->f_stop();
} else if (behavior == "REPLACE_ENQUEUED") {
v_content->f_clear();
}
auto& stream = payload / "audioItem" / "stream";
auto url = stream / "url"_jss;
auto token = stream / "token"_jss;
if (v_log) v_log(e_severity__TRACE) << "queuing: " << url << ", " << token << std::endl;
std::function<t_audio_source*()> open;
if (url.substr(0, 4) == "cid:")
open = [this, token, audio = std::make_shared<t_attached_audio>(*this, v_content->v_task, url.substr(4))]
{
return audio->f_open([this]
{
v_content_stuttering = std::chrono::steady_clock::now();
this->f_player_event("PlaybackStutterStarted");
}, [this, token]
{
this->f_event(this->f_metadata("AudioPlayer", "PlaybackStutterFinished", {
{"token", picojson::value(token)},
{"offsetInMilliseconds", picojson::value(static_cast<double>(v_content->f_offset()))},
{"stutterDurationInMilliseconds", picojson::value(static_cast<double>(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now() - v_content_stuttering).count()))}
}));
v_content_stuttering = std::chrono::steady_clock::time_point();
});
};
else
open = [this, url]
{
std::thread([&]
{
try {
v_scheduler.dispatch([&, source = v_open_audio_by_url(url)]
{
v_content->v_task.f_post([source](auto)
{
throw source;
});
});
} catch (...) {
v_scheduler.dispatch([&, e = std::current_exception()]
{
v_content->v_task.f_post([e](auto)
{
std::rethrow_exception(e);
});
});
}
}).detach();
try {
while (true) v_content->v_task.f_wait();
} catch (t_audio_source* source) {
return source;
}
};
v_content->f_queue([this, token, open = std::move(open)]
{
v_content->v_target.f_reset();
v_content->v_playing = token;
this->f_player_event("PlaybackStarted");
if (v_state_changed) v_state_changed();
try {
std::unique_ptr<t_audio_source> source(open());
t_audio_decoder decoder(*source);
v_content->f_loop(decoder);
this->f_player_event("PlaybackNearlyFinished");
v_content->f_flush();
this->f_player_event("PlaybackFinished");
} catch (nullptr_t) {
this->f_player_event("PlaybackStopped");
} catch (std::exception& e) {
this->f_event(this->f_metadata("AudioPlayer", "PlaybackFailed", {
{"token", picojson::value(token)},
{"currentPlaybackState", picojson::value(picojson::value::object{
{"token", picojson::value(token)},
{"offsetInMilliseconds", picojson::value(static_cast<double>(v_content->f_offset()))},
{"playerActivity", picojson::value("PLAYING")}
})},
{"error", picojson::value(picojson::value::object{
{"type", picojson::value("MEDIA_ERROR_UNKNOWN")},
{"message", picojson::value(e.what())}
})}
}));
}
v_content->v_playing.clear();
if (v_state_changed) v_state_changed();
});
auto report = stream * "progressReport";
if (!report) return;
auto delay = *report * "progressReportDelayInMilliseconds";
if (!!delay) v_scheduler.f_run_in(std::chrono::milliseconds(static_cast<long>((*delay).get<double>())), [this](auto)
{
this->f_player_event("ProgressReportDelayElapsed");
});
auto interval = *report * "progressReportIntervalInMilliseconds";
if (!!interval) v_scheduler.f_run_every(std::chrono::milliseconds(static_cast<long>((*interval).get<double>())), [this, token](auto)
{
if (v_content->v_playing != token) return false;
this->f_player_event("ProgressReportIntervalElapsed");
return true;
});
}},
{{"AudioPlayer", "Stop"}, [this](auto)
{
v_content->f_stop();
}},
{{"AudioPlayer", "ClearQueue"}, [this](auto a_directive)
{
auto& payload = a_directive / "directive" / "payload";
auto behavior = payload / "clearBehavior"_jss;
if (behavior == "CLEAR_ENQUEUED") {
v_content->f_clear();
} else if (behavior == "CLEAR_ALL") {
v_content->f_clear();
v_content->f_stop();
}
this->f_empty_event("AudioPlayer", "PlaybackQueueCleared");
}},
{{"Speaker", "SetVolume"}, [this](auto a_directive)
{
f_speaker_volume(a_directive / "directive" / "payload" / "volume"_jsn);
}},
{{"Speaker", "AdjustVolume"}, [this](auto a_directive)
{
f_speaker_volume(v_speaker_volume + a_directive / "directive" / "payload" / "volume"_jsn);
}},
{{"Speaker", "SetMute"}, [this](auto a_directive)
{
f_speaker_muted(a_directive / "directive" / "payload" / "mute"_jsb);
}},
{{"SpeechSynthesizer", "Speak"}, [this](auto a_directive)
{
auto& payload = a_directive / "directive" / "payload";
v_dialog->f_queue([this, token = payload / "token"_jss, audio = std::make_shared<t_attached_audio>(*this, v_dialog->v_task, (payload / "url"_jss).substr(4))]
{
auto f = [this, token](const std::string& a_name)
{
this->f_event(this->f_metadata("SpeechSynthesizer", a_name, {
{"token", picojson::value(token)}
}));
};
this->f_dialog_acquire(v_dialog->v_task);
v_dialog->v_target.f_reset();
v_dialog->v_playing = token;
f("SpeechStarted");
if (v_state_changed) v_state_changed();
try {
std::unique_ptr<t_audio_source> source(audio->f_open([] {}, [] {}));
t_audio_decoder decoder(*source);
v_dialog->f_loop(decoder);
v_dialog->f_flush();
} catch (nullptr_t) {
this->f_exception_encountered("SpeechSynthesizer.Speak", "INTERNAL_ERROR", "Stopped");
} catch (std::exception& e) {
this->f_exception_encountered("SpeechSynthesizer.Speak", "INTERNAL_ERROR", e.what());
}
f("SpeechFinished");
v_dialog->v_playing.clear();
this->f_dialog_release();
if (v_state_changed) v_state_changed();
});
}},
{{"System", "ResetUserInactivity"}, [this](auto)
{
v_last_activity = std::chrono::steady_clock::now();
}}
};
std::map<std::string, t_attached_audio*> v_id2audio;
t_channel* v_dialog = nullptr;
bool v_dialog_active = false;
std::map<std::string, t_alert> v_alerts;
size_t v_alerts_duration = 60;
t_channel* v_content = nullptr;
bool v_content_can_play_in_background = false;
bool v_content_pausing = false;
std::chrono::steady_clock::time_point v_content_stuttering;
long v_speaker_volume = 100;
bool v_speaker_muted = false;
t_task* v_recognizer = nullptr;
size_t v_capture_threshold = 32 * 1024;
size_t v_capture_integral = 0;
std::chrono::steady_clock::time_point v_capture_exceeded;
bool v_capture_busy = false;
bool v_capture_auto = true;
bool v_capture_force = false;
std::function<void()> v_expecting_speech;
boost::asio::steady_timer* v_expecting_timeout = nullptr;
std::string v_expecting_dialog_id;
std::chrono::steady_clock::time_point v_last_activity;
void f_reconnect()
{
f_disconnect();
if (v_log) v_log(e_severity__INFORMATION) << "reconnect in " << v_reconnecting_interval << " seconds." << std::endl;
v_reconnecting = &v_scheduler.f_run_in(std::chrono::seconds(v_reconnecting_interval), [this](auto a_ec)
{
if (v_reconnecting) {
v_reconnecting = nullptr;
this->f_connect();
} else {
v_reconnecting_interval = 1;
}
});
if (v_reconnecting_interval < 256) v_reconnecting_interval *= 2;
}
picojson::value f_context() const
{
picojson::value::array all;
picojson::value::array active;
for (auto& x : v_alerts) {
picojson::value alert(picojson::value::object{
{"token", picojson::value(x.first)},
{"type", picojson::value(x.second.v_type)},
{"scheduledTime", picojson::value(x.second.v_at)}
});
if (x.second.f_active()) active.push_back(alert);
all.push_back(std::move(alert));
}
return picojson::value(picojson::value::array{
picojson::value(picojson::value::object{
{"header", picojson::value(picojson::value::object{
{"namespace", picojson::value("AudioPlayer")},
{"name", picojson::value("PlaybackState")}
})},
{"payload", picojson::value(picojson::value::object{
{"token", picojson::value(v_content->v_playing)},
{"offsetInMilliseconds", picojson::value(static_cast<double>(v_content->v_playing.empty() ? 0 : v_content->f_offset()))},
{"playerActivity", picojson::value(v_content->v_playing.empty() ? (v_content->f_offset() > 0 ? "FINISHED" : "IDLE") : v_content_pausing ? "STOPPED" : v_content_stuttering > std::chrono::steady_clock::time_point() ? "BUFFER_UNDERRUN" : "PLAYING")}
})}
}),
picojson::value(picojson::value::object{
{"header", picojson::value(picojson::value::object{
{"namespace", picojson::value("Alerts")},
{"name", picojson::value("AlertsState")}
})},
{"payload", picojson::value(picojson::value::object{
{"allAlerts", picojson::value(all)},
{"activeAlerts", picojson::value(active)}
})}
}),
picojson::value(picojson::value::object{
{"header", picojson::value(picojson::value::object{
{"namespace", picojson::value("Speaker")},
{"name", picojson::value("VolumeState")}
})},
{"payload", picojson::value(picojson::value::object{
{"volume", picojson::value(static_cast<double>(v_speaker_volume))},
{"muted", picojson::value(v_speaker_muted)}
})}
}),
picojson::value(picojson::value::object{
{"header", picojson::value(picojson::value::object{
{"namespace", picojson::value("SpeechSynthesizer")},
{"name", picojson::value("SpeechState")}
})},
{"payload", picojson::value(picojson::value::object{
{"token", picojson::value(v_dialog->v_playing)},
{"offsetInMilliseconds", picojson::value(static_cast<double>(v_dialog->v_playing.empty() ? 0 : v_dialog->f_offset()))},
{"playerActivity", picojson::value(v_dialog->v_playing.empty() ? "FINISHED" : "PLAYING")}
})}
})
});
}
picojson::value f_metadata(const std::string& a_namespace, const std::string& a_name, picojson::value::object&& a_payload)
{
if (v_log) v_log(e_severity__INFORMATION) << "event: " << a_namespace << "." << a_name << std::endl;
return picojson::value(picojson::value::object{
{"event", picojson::value(picojson::value::object{
{"header", picojson::value(picojson::value::object{
{"namespace", picojson::value(a_namespace)},
{"name", picojson::value(a_name)},
{"messageId", picojson::value("messateId-" + std::to_string(++v_message_id))}
})},
{"payload", picojson::value(std::move(a_payload))}
})}
});
}
void f_setup(const nghttp2::asio_http2::client::response& a_response)
{
if (v_log) {
auto& log = v_log(e_severity__TRACE);
for (auto& x : a_response.header()) log << x.first << ": " << x.second.value << std::endl;
}
auto i = a_response.header().find("content-type");
if (i == a_response.header().end()) return;
std::smatch match;
if (!std::regex_match(i->second.value, match, v_re_content_type)) return;
a_response.on_data([this, &a_response, parser = std::make_shared<t_parser>(*this, match[1].str())](auto a_p, size_t a_n)
{
if (v_log) v_log(e_severity__TRACE) << "response(" << &a_response << ") on data: " << a_n << std::endl;
(*parser)(a_p, a_n);
});
}
template<typename T_data>
const nghttp2::asio_http2::client::request* f_post(T_data a_data)
{
if (!v_online) {
if (v_log) v_log(e_severity__INFORMATION) << "offline." << std::endl;
return nullptr;
}
boost::system::error_code ec;
auto request = v_session->submit(ec, "POST", "https://avs-alexa-na.amazon.com/v20160207/events", a_data, v_header);
if (!request) {
if (v_log) v_log(e_severity__ERROR) << "events POST failed: " << ec.message() << std::endl;
f_reconnect();
return nullptr;
}
if (v_log) v_log(e_severity__TRACE) << "events POST(" << request << ") opened." << std::endl;
request->on_response([this, request](auto& a_response)
{
if (v_log) v_log(e_severity__TRACE) << "events POST(" << request << ") on response(" << &a_response << ") " << a_response.status_code() << std::endl;
this->f_setup(a_response);
});
return request;
}
void f_event(const picojson::value& a_metadata)
{
auto request = f_post(v_boundary_metadata + a_metadata.serialize() + v_boundary_terminator);
if (request) request->on_close([this, request](auto a_code)
{
if (v_log) v_log(e_severity__TRACE) << "events POST(" << request << ") on close: " << a_code << std::endl;
});
}
void f_empty_event(const std::string& a_namespace, const std::string& a_name)
{
f_event(f_metadata(a_namespace, a_name, {}));
}
void f_exception_encountered(const std::string& a_directive, const std::string& a_type, const char* a_message)
{
auto metadata = f_metadata("System", "ExceptionEncountered", {
{"unparsedDirective", picojson::value(a_directive)},
{"error", picojson::value(picojson::value::object{
{"type", picojson::value(a_type)},
{"message", picojson::value(a_message)}
})}
});
metadata << "context" & f_context();
f_event(metadata);
}
void f_alerts_event(const std::string& a_name, const std::string& a_token)
{
f_event(f_metadata("Alerts", a_name, {
{"token", picojson::value(a_token)}
}));
}
public:
void f_alerts_set(const std::string& a_token, const std::string& a_type, const std::string& a_at)
{
std::tm tm{};
std::stringstream s(a_at);
s >> std::get_time(&tm, "%Y-%m-%dT%H:%M:%S");
if (s.fail()) throw std::runtime_error("invalid format");
auto t = std::mktime(&tm);
tzset();
t -= timezone;
if (t == -1) throw std::runtime_error("invalid time");
auto at = std::chrono::system_clock::from_time_t(t);
if (at < std::chrono::system_clock::now() - std::chrono::minutes(30)) {
f_alerts_event("AlertStopped", a_token);
return;
}
auto i = v_alerts.emplace(a_token, t_alert(a_type, a_at)).first;
i->second.v_timer.reset(new boost::asio::system_timer(v_scheduler.f_io(), at));
i->second.v_timer->async_wait(v_scheduler.wrap([this, i](auto a_ec)
{
if (i->second.v_type.empty()) {
v_alerts.erase(i);
if (v_alerts_changed) v_alerts_changed();
return;
}
if (v_log) v_log(e_severity__INFORMATION) << "alert: " << i->first << std::endl;
auto f = [this, i]
{
i->second.v_play = v_open_sound(i->second.v_type);
i->second.v_play(v_dialog_active);
this->f_alerts_event("AlertStarted", i->first);
i->second.v_timer->expires_from_now(std::chrono::seconds(v_alerts_duration));
i->second.v_timer->async_wait(v_scheduler.wrap([this, i](auto)
{
this->f_alerts_event("AlertStopped", i->first);
v_alerts.erase(i);
if (v_alerts_changed) v_alerts_changed();
if (v_dialog_active) return;
for (auto& x : v_alerts) if (x.second.f_active()) return;
this->f_player_foreground();
}));
if (v_state_changed) v_state_changed();
};
if (v_dialog_active)
f();
else
this->f_player_background(f);
}));
}
private:
void f_alerts_delete(const std::string& a_token)
{
auto& alert = v_alerts.at(a_token);
if (alert.f_active()) throw std::runtime_error("already active");
alert.f_cancel();
}
void f_player_event(const std::string& a_name)
{
f_event(f_metadata("AudioPlayer", a_name, {
{"token", picojson::value(v_content->v_playing)},
{"offsetInMilliseconds", picojson::value(static_cast<double>(v_content->f_offset()))}
}));
}
template<typename T_done>
void f_player_background(T_done a_done)
{
if (v_content_can_play_in_background) {
alSourcef(v_content->v_target, AL_GAIN, 1.0f / 16.0f);
a_done();
} else if (v_content_pausing) {
a_done();
} else {
v_content->v_task.f_post([this, a_done](auto)
{
if (!v_content->v_playing.empty()) {
alSourcePause(v_content->v_target);
this->f_player_event("PlaybackPaused");
}
v_content_pausing = true;
a_done();
do v_content->v_task.f_wait(); while (v_content_pausing);
if (!v_content->v_playing.empty()) {
alSourcePlay(v_content->v_target);
this->f_player_event("PlaybackResumed");
}
});
}
}
void f_player_foreground()
{
if (v_content_can_play_in_background) {
alSourcef(v_content->v_target, AL_GAIN, 1.0f);
} else {
v_content_pausing = false;
v_content->v_task.f_notify();
}
}
void f_playback_event(const std::string& a_name)
{
alSourcePause(v_content->v_target);
auto metadata = f_metadata("PlaybackController", a_name, {});
metadata << "context" & f_context();
f_event(metadata);
}
void f_speaker_event(const std::string& a_name)
{
f_event(f_metadata("Speaker", a_name, {
{"volume", picojson::value(static_cast<double>(v_speaker_volume))},
{"muted", picojson::value(v_speaker_muted)}
}));
}
void f_speaker_apply()
{
alListenerf(AL_GAIN, v_speaker_muted ? 0.0f : v_speaker_volume / 100.0f);
if (v_speaker_changed) v_speaker_changed();
}
void f_dialog_acquire(t_task& a_task)
{
while (v_dialog_active) a_task.f_wait();
v_dialog_active = true;
for (auto& x : v_alerts) {
if (!x.second.f_active()) continue;
x.second.v_play(true);
f_alerts_event("AlertEnteredBackground", x.first);
}
bool done = false;
f_player_background([&]
{
done = true;
a_task.f_notify();
});
while (!done) a_task.f_wait();
}
void f_dialog_release()
{
bool b = false;
for (auto& x : v_alerts) {
if (!x.second.f_active()) continue;
x.second.v_play(false);
f_alerts_event("AlertEnteredForeground", x.first);
b = true;
}
if (!b) f_player_foreground();
v_dialog_active = false;
v_dialog->v_task.f_notify();
v_recognizer->f_notify();
}
bool f_capture(ALCdevice* a_device, char* a_buffer, bool a_busy)
{
while (true) {
if (!a_busy && !v_expecting_timeout && v_expecting_speech) v_expecting_speech();
if ((v_capture_busy && v_capture_auto && v_dialog->v_playing.empty() && v_content->v_playing.empty() || v_capture_force) != a_busy) return false;
ALCint n;
alcGetIntegerv(a_device, ALC_CAPTURE_SAMPLES, 1, &n);
if (n >= 160) break;
v_recognizer->f_wait(std::chrono::milliseconds((160 - n) / 16));
}
alcCaptureSamples(a_device, a_buffer, 160);
v_capture_integral /= 2;
for (size_t i = 0; i < 160; ++i) v_capture_integral += std::abs(reinterpret_cast<int16_t*>(a_buffer)[i]);
auto now = std::chrono::steady_clock::now();
if (v_capture_integral > v_capture_threshold) v_capture_exceeded = now;
v_capture_busy = now - v_capture_exceeded < std::chrono::seconds(1);
if (v_capture) v_capture();
return true;
}
void f_recognizer()
{
while (true) {
std::unique_ptr<ALCdevice, decltype(&alcCaptureCloseDevice)> device(alcCaptureOpenDevice(NULL, 16000, AL_FORMAT_MONO16, 1600), alcCaptureCloseDevice);
if (!device) {
if (v_log) v_log(e_severity__ERROR) << "alcCaptureOpenDevice: " << alGetError() << std::endl;
v_recognizer->f_wait(std::chrono::seconds(5));
continue;
}
alcCaptureStart(device.get());
auto queue = std::make_shared<std::pair<std::deque<char>, bool>>(std::deque<char>(), false);
auto& deque = queue->first;
char buffer[320];
const size_t window = sizeof(buffer) * 100;
while (f_capture(device.get(), buffer, false)) {
size_t n = deque.size() + sizeof(buffer);
if (n > window) deque.erase(deque.begin(), deque.begin() + (n - window));
deque.insert(deque.end(), buffer, buffer + sizeof(buffer));
}
if (v_expecting_timeout) {
v_expecting_timeout->cancel();
v_expecting_speech = nullptr;
v_expecting_timeout = nullptr;
} else {
if (v_capture_force) {
v_dialog->f_clear();
v_dialog->f_stop();
}
f_dialog_acquire(*v_recognizer);
}
if (v_state_changed) v_state_changed();
if (v_log) v_log(e_severity__INFORMATION) << "recognize started." << std::endl;
deque.insert(deque.begin(), v_boundary_audio.begin(), v_boundary_audio.end());
{
auto metadata = f_metadata("SpeechRecognizer", "Recognize", {
{"profile", picojson::value("CLOSE_TALK")},
{"format", picojson::value("AUDIO_L16_RATE_16000_CHANNELS_1")}
});
metadata << "context" & f_context();
if (v_expecting_dialog_id.empty()) {
metadata / "event" / "header" << "dialogRequestId" & "dialogRequestId-" + std::to_string(++v_dialog_id);
} else {
metadata / "event" / "header" << "dialogRequestId" & v_expecting_dialog_id;
v_expecting_dialog_id.clear();
}
auto s = metadata.serialize();
deque.insert(deque.begin(), s.begin(), s.end());
}
deque.insert(deque.begin(), v_boundary_metadata.begin(), v_boundary_metadata.end());
auto request = f_post([queue](auto a_p, auto a_n, auto a_flags)
{
auto& deque = queue->first;
if (a_n > deque.size()) a_n = deque.size();
if (a_n > 0) {
auto i = deque.begin();
std::copy_n(i, a_n, a_p);
deque.erase(i, i + a_n);
} else {
if (!queue->second) return static_cast<size_t>(NGHTTP2_ERR_DEFERRED);
*a_flags |= NGHTTP2_DATA_FLAG_EOF;
}
return a_n;
});
if (request) {
auto p = std::make_shared<decltype(request)>(request);
request->on_close([this, p](auto a_code)
{
if (v_log) v_log(e_severity__TRACE) << "events POST(" << *p << ") on close: " << a_code << std::endl;
*p = nullptr;
v_recognizer->f_notify();
});
while (f_capture(device.get(), buffer, true)) {
deque.insert(deque.end(), buffer, buffer + 320);
if (*p) request->resume();
}
f_dialog_release();
if (*p) {
deque.insert(deque.end(), v_boundary_terminator.begin(), v_boundary_terminator.end());
queue->second = true;
request->resume();
device.reset();
do v_recognizer->f_wait(); while (*p);
}
if (v_log) v_log(e_severity__INFORMATION) << "recognize finished." << std::endl;
} else {
if (v_log) v_log(e_severity__ERROR) << "recognize failed." << std::endl;
while (f_capture(device.get(), buffer, true));
f_dialog_release();
}
v_last_activity = std::chrono::steady_clock::now();
if (v_state_changed) v_state_changed();
}
}
public:
std::function<std::ostream&(t_severity)> v_log;
std::function<void()> v_capture;
std::function<void()> v_state_changed;
std::function<void()> v_options_changed;
std::function<void()> v_alerts_changed;
std::function<void()> v_speaker_changed;
std::function<t_audio_source*(const std::string&)> v_open_audio_by_url = [](auto& a_url)
{
return new t_url_audio_source(a_url.c_str());
};
t_session(t_scheduler& a_scheduler, const std::function<std::ostream&(t_severity)>& a_log, const std::function<std::function<void(bool)>(const std::string&)> a_open_sound) : v_tls(boost::asio::ssl::context::tlsv12), v_scheduler(a_scheduler), v_log(a_log), v_open_sound(a_open_sound)
{
v_tls.set_default_verify_paths();
boost::system::error_code ec;
nghttp2::asio_http2::client::configure_tls_context(ec, v_tls);
auto run = [this](const char* a_name, auto a_run)
{
while (true) {
try {
a_run();
} catch (t_scheduler::t_stop&) {
throw;
} catch (std::exception& e) {
if (v_log) v_log(e_severity__ERROR) << a_name << ": caught " << e.what() << std::endl;
} catch (...) {
if (v_log) v_log(e_severity__ERROR) << a_name << ": caught unknown" << std::endl;
}
}
};
v_scheduler.f_spawn([this, run](auto& a_task)
{
t_channel dialog(a_task);
v_dialog = &dialog;
run("dialog", [this]
{
v_dialog->f_run();
});
});
v_scheduler.f_spawn([this, run](auto& a_task)
{
t_channel content(a_task);
v_content = &content;
run("content", [this]
{
v_content->f_run();
});
});
v_scheduler.f_spawn([this, run](auto& a_task)
{
v_recognizer = &a_task;
run("recognizer", [this]
{
this->f_recognizer();
});
});
v_scheduler.f_run_every(std::chrono::hours(1), [this](auto)
{
this->f_event(this->f_metadata("System", "UserInactivityReport", {
{"inactiveTimeInSeconds", picojson::value(static_cast<double>(std::chrono::duration_cast<std::chrono::seconds>(std::chrono::steady_clock::now() - v_last_activity).count()))}
}));
return true;
});
}
t_scheduler& f_scheduler() const
{
return v_scheduler;
}
bool f_online() const
{
return v_online;
}
void f_connect()
{
if (v_reconnecting) {
v_reconnecting->cancel();
v_reconnecting = nullptr;