Rework radio support for new gRPC API

Update the stubbed out radio support library to use the new gRPC API.
The "Radio" Qt wrapper object has been renamed to "RadioClient" to
avoid conflicting with the generated gRPC API code.  This somewhat
aligns with the naming that has been used with the AppLauncher
support.

Bug-AGL: SPEC-4665

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I642f9b9b62d6981cf5231ecea4caddba713f493a

1 files changed, 213 insertions, 0 deletions

diff --git a/radio/RadioGrpcClient.cpp b/radio/RadioGrpcClient.cpp
new file mode 100644
index 0000000..3795d1d
--- /dev/null
+++ b/radio/RadioGrpcClient.cpp
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+ * Copyright (C) 2023 Konsulko Group
+ */
+
+#include <QDebug>
+#include "RadioGrpcClient.h"
+#include "RadioClient.h"
+
+using grpc::Channel;
+using grpc::ClientContext;
+using grpc::ClientReader;
+using grpc::Status;
+
+using automotivegradelinux::Radio;
+using automotivegradelinux::SetBandRequest;
+using automotivegradelinux::SetBandResponse;
+using automotivegradelinux::SetFrequencyRequest;
+using automotivegradelinux::SetFrequencyResponse;
+using automotivegradelinux::StartRequest;
+using automotivegradelinux::StartResponse;
+using automotivegradelinux::StopRequest;
+using automotivegradelinux::StopResponse;
+using automotivegradelinux::ScanStartRequest;
+using automotivegradelinux::ScanStartResponse;
+using automotivegradelinux::ScanStopRequest;
+using automotivegradelinux::ScanStopResponse;
+using automotivegradelinux::GetBandParametersRequest;
+using automotivegradelinux::GetBandParametersResponse;
+using automotivegradelinux::StatusRequest;
+using automotivegradelinux::StatusResponse;
+using automotivegradelinux::BandStatus;
+using automotivegradelinux::FrequencyStatus;
+using automotivegradelinux::PlayStatus;
+using automotivegradelinux::ScanStatus;
+
+// Enum values used
+using automotivegradelinux::BAND_AM;
+using automotivegradelinux::BAND_FM;
+using automotivegradelinux::SCAN_DIRECTION_FORWARD;
+using automotivegradelinux::SCAN_DIRECTION_BACKWARD;
+
+void RadioStatusEventReader::GetStatusEvents()
+{
+	ClientContext context;
+	StatusRequest request;
+	StatusResponse response;
+
+	std::unique_ptr<ClientReader<StatusResponse> > reader(stub_->GetStatusEvents(&context, request));
+	while (reader->Read(&response)) {
+		if (response.has_band()) {
+			BandStatus band_status = response.band();
+			unsigned int band;
+			if (band_status.band() == BAND_AM)
+				band = 0;
+			else if (band_status.band() == BAND_FM)
+				band = 1;
+			else
+				continue;
+			emit bandUpdate(band);
+		} else if (response.has_frequency()) {
+			FrequencyStatus frequency_status = response.frequency();
+			emit frequencyUpdate(frequency_status.frequency());
+		} else if (response.has_play()) {
+			PlayStatus play_status = response.play();
+			emit playingUpdate(play_status.playing());
+		} else if (response.has_scan()) {
+			ScanStatus scan_status = response.scan();
+			emit scanningUpdate(scan_status.station_found());
+		}
+	}
+	Status status = reader->Finish();
+	if (!status.ok()) {
+			qWarning() << "GetStatusEvents RPC failed";
+	}
+
+	emit finished();
+}
+
+
+RadioGrpcClient::RadioGrpcClient(QObject *parent) : QObject(parent)
+{
+	stub_ = Radio::NewStub(grpc::CreateChannel("localhost:50053", grpc::InsecureChannelCredentials()));
+
+	// Create thread to read status events
+	RadioStatusEventReader *reader = new RadioStatusEventReader(stub_);
+	reader->moveToThread(&m_event_thread);
+	connect(&m_event_thread, &QThread::started, reader, &RadioStatusEventReader::GetStatusEvents);
+	connect(reader, &RadioStatusEventReader::finished, &m_event_thread, &QThread::quit);
+	// FIXME: Normally the thread finishing would be connected per the below
+	//        to trigger cleaning up the object.  That seems to trigger a crash
+	//        for not entirely obvious reasons.  It seems unrelated to the signal
+	//        connection to AppLauncherClient, as not connecting does not prevent
+	//        the crash; further investigation is required.
+	//connect(reader, &RadioStatusEventReader::finished, reader, &RadioStatusEventReader::deleteLater);
+	//connect(&m_event_thread, &QThread::finished, &m_event_thread, &QThread::deleteLater);
+
+	// To avoid having intermediary slot+signal's in this class, try
+	// casting parent to Radio and connect directly to its slot.
+	// Callers should set parent to ensure this works as required.
+	if (parent) {
+		RadioClient *radio = qobject_cast<RadioClient*>(parent);
+		if (radio) {
+			connect(reader,
+				&RadioStatusEventReader::bandUpdate,
+				radio,
+				&RadioClient::updateBand);
+			connect(reader,
+				&RadioStatusEventReader::frequencyUpdate,
+				radio,
+				&RadioClient::updateFrequency);
+			connect(reader,
+				&RadioStatusEventReader::playingUpdate,
+				radio,
+				&RadioClient::updatePlaying);
+			connect(reader,
+				&RadioStatusEventReader::scanningUpdate,
+				radio,
+				&RadioClient::updateScanning);
+		}
+	}
+
+	// Start status event handling
+	m_event_thread.start();
+}
+
+void RadioGrpcClient::SetBand(unsigned int band)
+{
+	SetBandRequest request;
+
+	ClientContext context;
+	SetBandResponse response;
+	if (band)
+		request.set_band(BAND_FM);
+	else
+		request.set_band(BAND_AM);
+	Status status = stub_->SetBand(&context, request, &response);
+}
+
+void RadioGrpcClient::SetFrequency(unsigned int frequency)
+{
+	SetFrequencyRequest request;
+
+	ClientContext context;
+	SetFrequencyResponse response;
+	request.set_frequency(frequency);
+	Status status = stub_->SetFrequency(&context, request, &response);
+}
+
+void RadioGrpcClient::Start()
+{
+	StartRequest request;
+
+	ClientContext context;
+	StartResponse response;
+	Status status = stub_->Start(&context, request, &response);
+}
+
+void RadioGrpcClient::Stop()
+{
+	StopRequest request;
+
+	ClientContext context;
+	StopResponse response;
+	Status status = stub_->Stop(&context, request, &response);
+}
+
+void RadioGrpcClient::ScanForward()
+{
+	ScanStartRequest request;
+
+	ClientContext context;
+	ScanStartResponse response;
+	request.set_direction(SCAN_DIRECTION_FORWARD);
+	Status status = stub_->ScanStart(&context, request, &response);
+}
+
+void RadioGrpcClient::ScanBackward()
+{
+	ScanStartRequest request;
+
+	ClientContext context;
+	ScanStartResponse response;
+	request.set_direction(SCAN_DIRECTION_BACKWARD);
+	Status status = stub_->ScanStart(&context, request, &response);
+}
+
+void RadioGrpcClient::ScanStop()
+{
+	ScanStopRequest request;
+
+	ClientContext context;
+	ScanStopResponse response;
+	Status status = stub_->ScanStop(&context, request, &response);
+}
+
+void RadioGrpcClient::GetBandParameters(unsigned int band, unsigned int &min, unsigned int &max, unsigned int &step)
+{
+	GetBandParametersRequest request;
+
+	ClientContext context;
+	GetBandParametersResponse response;
+	if (band)
+		request.set_band(BAND_FM);
+	else
+		request.set_band(BAND_AM);
+	Status status = stub_->GetBandParameters(&context, request, &response);
+	if (status.ok()) {
+		min = response.min();
+		max = response.max();
+		step = response.step();
+	}
+}