Rework to switch to using KUKSA.val databroker

Rework to use the "VAL" gRPC API from the KUKSA.val databroker
instead of the older server's WebSocket interface.  Some source
files have been renamed to match the class naming to provide
a bit more consistency.

Bug-AGL: SPEC-4762

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I5ded74cfbd6987cd045b7b142fd9f38971aaef66

1 files changed, 278 insertions, 0 deletions

diff --git a/src/AudiomixerService.cpp b/src/AudiomixerService.cpp
new file mode 100644
index 0000000..f2445b8
--- /dev/null
+++ b/src/AudiomixerService.cpp
@@ -0,0 +1,278 @@
+/*
+ * Copyright (C) 2022,2023 Konsulko Group
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <algorithm>
+#include <thread>
+#include <chrono>
+
+#include "AudiomixerService.h"
+
+AudiomixerService::AudiomixerService(const KuksaConfig &config, GMainLoop *loop) :
+	m_loop(loop),
+	m_config(config)
+{
+	m_audiomixer = audiomixer_new();
+	if (m_audiomixer) {
+		// Set up callbacks for WirePlumber events
+		m_audiomixer_events.controls_changed = mixer_control_change_cb;
+		m_audiomixer_events.value_changed = mixer_value_change_cb;
+		audiomixer_add_event_listener(m_audiomixer, &m_audiomixer_events, this);
+
+		// Drive connecting to PipeWire core and refreshing controls list
+		audiomixer_lock(m_audiomixer);
+		audiomixer_ensure_controls(m_audiomixer, 3);
+		audiomixer_unlock(m_audiomixer);
+	} else {
+		std::cerr << "Could not create WirePlumber connection" << std::endl;
+	}
+
+	// Set initial volume
+	if (m_audiomixer) {
+		audiomixer_lock(m_audiomixer);
+		const struct mixer_control *ctl = audiomixer_find_control(m_audiomixer, "Master Playback");
+		if (ctl) {
+			audiomixer_change_volume(m_audiomixer, ctl, 0.5);
+		}
+		audiomixer_unlock(m_audiomixer);
+	}
+
+	// Create gRPC channel
+	std::string host = m_config.hostname();
+	host += ":";
+	std::stringstream ss;
+	ss << m_config.port();
+	host += ss.str();
+
+	std::shared_ptr<grpc::Channel> channel;
+	if (!m_config.caCert().empty()) {
+		grpc::SslCredentialsOptions options;
+		options.pem_root_certs = m_config.caCert();
+		if (!m_config.tlsServerName().empty()) {
+			grpc::ChannelArguments args;
+			auto target = m_config.tlsServerName();
+			std::cout << "Overriding TLS target name with " << target << std::endl;
+			args.SetString(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG, target);
+			channel = grpc::CreateCustomChannel(host, grpc::SslCredentials(options), args);
+		} else {
+			channel = grpc::CreateChannel(host, grpc::SslCredentials(options));
+		}
+	} else {
+		channel = grpc::CreateChannel(host, grpc::InsecureChannelCredentials());
+	}
+
+	// Wait for the channel to be ready
+	std::cout << "Waiting for Databroker gRPC channel" << std::endl;
+	while (!channel->WaitForConnected(std::chrono::system_clock::now() +
+					  std::chrono::milliseconds(500))) ;
+	std::cout << "Databroker gRPC channel ready" << std::endl;
+
+	m_broker = new KuksaClient(channel, m_config);
+	if (m_broker) {
+		// Listen to actuator target updates for the volume signal and
+		// values for the steering wheel volume switch signals.
+		std::map<std::string, bool> signals;
+		signals["Vehicle.Cabin.Infotainment.Media.Volume"] = true;
+		signals["Vehicle.Cabin.SteeringWheel.Switches.VolumeUp"] = false;
+		signals["Vehicle.Cabin.SteeringWheel.Switches.VolumeDown"] = false;
+		signals["Vehicle.Cabin.SteeringWheel.Switches.VolumeMute"] = false;
+		m_broker->subscribe(signals,
+				    [this](const std::string &path, const Datapoint &dp) {
+					    HandleSignalChange(path, dp);
+				    },
+				    [this](const SubscribeRequest *request, const Status &s) {
+					    HandleSubscribeDone(request, s);
+				    });
+
+		// Set initial volume in VSS
+		// Push out the default value of 50 which matches the default in the
+		// homescreen app. Ideally there would be some form of persistence
+		// scheme to restore the last value on restart.
+		m_broker->set("Vehicle.Cabin.Infotainment.Media.Volume",
+			      50U,
+			      [this](const std::string &path, const Error &error) {
+				      HandleSignalSetError(path, error);
+			      });
+	} else {
+		std::cerr << "Could not create Kuksa API client" << std::endl;
+	}
+}
+
+AudiomixerService::~AudiomixerService()
+{
+	delete m_broker;
+
+	audiomixer_free(m_audiomixer);
+}
+
+// Private
+
+void AudiomixerService::HandleSignalChange(const std::string &path, const Datapoint &dp)
+{
+	if (m_config.verbose() > 1)
+		std::cout << "AudiomixerService::HandleSignalChange: Value received for " << path << std::endl;
+
+	if (!m_audiomixer)
+		return;
+
+	audiomixer_lock(m_audiomixer);
+
+	const struct mixer_control *ctl = audiomixer_find_control(m_audiomixer, "Master Playback");
+	if (!ctl) {
+		audiomixer_unlock(m_audiomixer);
+		return;
+	}
+	if (path == "Vehicle.Cabin.Infotainment.Media.Volume") {
+		if (dp.has_uint32()) {
+			uint32_t volume = dp.uint32();
+			if (volume >= 0 && volume <= 100) {
+				double v = (double) volume / 100.0;
+				if (m_config.verbose() > 1)
+					std::cout << "Setting volume to " << v << std::endl;
+				audiomixer_change_volume(m_audiomixer, ctl, v);
+
+				// Push out new value
+				m_broker->set("Vehicle.Cabin.Infotainment.Media.Volume",
+					      volume,
+					      [this](const std::string &path, const Error &error) {
+						      HandleSignalSetError(path, error);
+					      });
+			}
+		}
+	} else if (path == "Vehicle.Cabin.SteeringWheel.Switches.VolumeUp") {
+		if (dp.has_bool_() && dp.bool_()) {
+			double volume = ctl->volume;
+			volume += 0.05; // up 5%
+			if (volume > 1.0)
+				volume = 1.0; // clamp to 100%
+			if (m_config.verbose() > 1)
+				std::cout << "Increasing volume to " << volume << std::endl;
+			audiomixer_change_volume(m_audiomixer, ctl, volume);
+
+			// Push out new value
+			m_broker->set("Vehicle.Cabin.Infotainment.Media.Volume",
+				      (unsigned) (volume * 100),
+				      [this](const std::string &path, const Error &error) {
+					      HandleSignalSetError(path, error);
+				      });
+		}
+	} else if (path == "Vehicle.Cabin.SteeringWheel.Switches.VolumeDown") {
+		if (dp.has_bool_() && dp.bool_()) {
+			double volume = ctl->volume;
+			volume -= 0.05; // down 5%
+			if (volume < 0.0)
+				volume = 0.0; // clamp to 0%
+			if (m_config.verbose() > 1)
+				std::cout << "Decreasing volume to " << volume << std::endl;
+			audiomixer_change_volume(m_audiomixer, ctl, volume);
+
+			// Push out new value
+			m_broker->set("Vehicle.Cabin.Infotainment.Media.Volume",
+				      (unsigned) (volume * 100),
+				      [this](const std::string &path, const Error &error) {
+					      HandleSignalSetError(path, error);
+				      });
+		}
+	} else if (path == "Vehicle.Cabin.SteeringWheel.Switches.VolumeMute") {
+		if (dp.has_bool_() && dp.bool_()) {
+			if (m_config.verbose() > 1) {
+				if (ctl->mute)
+					std::cout << "Unmuting" << std::endl;
+				else
+					std::cout << "Muting" << std::endl;
+			}
+			audiomixer_change_mute(m_audiomixer, ctl, !ctl->mute);
+		}
+	}
+	// else ignore
+
+	audiomixer_unlock(m_audiomixer);
+}
+
+void AudiomixerService::HandleSignalSetError(const std::string &path, const Error &error)
+{
+	std::cerr << "Error setting " << path << ": " << error.code() << " - " << error.reason() << std::endl;
+}
+
+void AudiomixerService::HandleSubscribeDone(const SubscribeRequest *request, const Status &status)
+{
+	if (m_config.verbose())
+		std::cout << "Subscribe status = " << status.error_code() <<
+			" (" << status.error_message() << ")" << std::endl;
+
+	if (status.error_code() == grpc::CANCELLED) {
+		if (m_config.verbose())
+			std::cerr << "Subscribe canceled, assuming shutdown" << std::endl;
+		return;
+	}
+
+	// Queue up a resubcribe via the GLib event loop callback
+	struct resubscribe_data *data = new (struct resubscribe_data);
+	if (!data) {
+		std::cerr << "Could not create resubcribe_data" << std::endl;
+		exit(1);
+	}
+	data->self = this;
+	// Need to copy request since the one we have been handed is from the
+	// finished subscribe and will be going away.
+	data->request = new SubscribeRequest(*request);
+	if (!data->request) {
+		std::cerr << "Could not create resubscribe SubscribeRequest" << std::endl;
+		exit(1);
+	}
+
+	// NOTE: Waiting 100 milliseconds for now; it is possible that some
+	//       randomization and/or back-off may need to be added if many
+	//       subscribes are active, or switching to some other resubscribe
+	//       scheme altogether (e.g. post subscribes to a thread that waits
+	//       for the channel to become connected again).
+	g_timeout_add_full(G_PRIORITY_DEFAULT,
+			   100,
+			   resubscribe_cb,
+			   data,
+			   NULL);
+}
+
+void AudiomixerService::Resubscribe(const SubscribeRequest *request)
+{
+	if (!(m_broker && request))
+		return;
+
+	m_broker->subscribe(request,
+			    [this](const std::string &path, const Datapoint &dp) {
+				    HandleSignalChange(path, dp);
+			    },
+			    [this](const SubscribeRequest *request, const Status &s) {
+				    HandleSubscribeDone(request, s);
+			    });
+}
+
+void AudiomixerService::HandleMixerControlChange(void)
+{
+	// Ignore for now
+}
+
+void AudiomixerService::HandleMixerValueChange(unsigned int change_mask, const struct mixer_control *control)
+{
+	if (!control)
+		return;
+
+	if (change_mask & MIXER_CONTROL_CHANGE_FLAG_VOLUME) {
+		if (std::string(control->name) == "Master Playback") {
+			// Push out new value
+			unsigned value = control->volume * 100;
+			m_broker->set("Vehicle.Cabin.Infotainment.Media.Volume",
+				      value,
+				      [this](const std::string &path, const Error &error) {
+					      HandleSignalSetError(path, error);
+				      });
+		}
+	} else if (change_mask & MIXER_CONTROL_CHANGE_FLAG_MUTE) {
+		// For now, do nothing, new state is in control->mute
+	}
+}