Rework to use KUKSA.val databroker gRPC API

Rework to move from the WebSocket API with the older KUKSA.val
server to the gRPC "VAL" API of the databroker.

Changes include:
- All VISS WebSocket API code has been removed, and the signal
  providers replumbed to be driven by a new VssClient class with
  a homescreen-specific child class to hold all the gRPC API
  handling.
- The generated code for the VAL API and its dependencies has
  been checked in under lib/generated, as there still does not
  seem to be a good way to generate it during the Flutter build.
- The configuration file is now expected to be "homescreen.yaml"
  instead of "homescreen_config.yaml".  The authorization token
  field name has been renamed to "authorization", and there are
  new "use-tls" and "ca-certificate" configuration fields.  TLS
  is disabled by default for now, and the default CA certificate
  is /etc/kuksa.val/CA.pem.
- Updated .gitignore to cover a couple of generated files that
  weren't included.

Bug-AGL: SPEC-4762, SPEC-4903

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I1b95ed27a72435364d54ec846f2be88e3d8bb092

1 files changed, 75 insertions, 0 deletions

diff --git a/lib/vehicle-signals/vss_provider.dart b/lib/vehicle-signals/vss_provider.dart
new file mode 100644
index 0000000..e0fa1b8
--- /dev/null
+++ b/lib/vehicle-signals/vss_provider.dart
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: Apache-2.0
+import 'dart:io';
+import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:grpc/grpc.dart';
+import 'package:flutter_homescreen/generated/kuksa/val/v1/val.pbgrpc.dart';
+import 'package:flutter_homescreen/generated/kuksa/val/v1/types.pb.dart';
+import 'package:flutter_homescreen/config.dart';
+import 'package:flutter_homescreen/vehicle-signals/vss_client.dart';
+import 'package:flutter_homescreen/vehicle-signals/vss_path.dart';
+import 'package:flutter_homescreen/vehicle-signals/vss_signal_providers.dart';
+
+class HomescreenVssClient extends VssClient {
+  @override
+  final List<String> signals = [
+      VSSPath.vehicleMediaVolume,
+      VSSPath.vehicleInsideTemperature,
+      VSSPath.vehicleOutsideTemperature
+    ];
+
+  HomescreenVssClient({required super.config, required super.channel, required super.stub, required super.ref});
+
+  @override
+  void handleSignalUpdates(EntryUpdate update) {
+    switch (update.entry.path) {
+      case VSSPath.vehicleMediaVolume:
+        if (update.entry.value.hasUint32()) {
+          ref
+            .read(vehicleSignalMediaVolumeProvider.notifier)
+            .update(volume: update.entry.value.uint32);
+        }
+        break;
+      case VSSPath.vehicleInsideTemperature:
+        if (update.entry.value.hasFloat()) {
+          ref
+            .read(vehicleSignalInsideTempProvider.notifier)
+            .update(temp: update.entry.value.float);
+        }
+        break;
+      case VSSPath.vehicleOutsideTemperature:
+        if (update.entry.value.hasFloat()) {
+          ref
+            .read(vehicleSignalOutsideTempProvider.notifier)
+            .update(temp: update.entry.value.float);
+        }
+        break;
+      default:
+        print("ERROR: Unexpected path ${update.entry.path}");
+        break;
+    }
+  }
+}
+
+final vssClientProvider = Provider((ref) {
+  var config = ref.read(kuksaConfigProvider);
+  debugPrint("Using ${config.hostname}:${config.port}");
+  ChannelCredentials creds;
+  if (config.use_tls && config.ca_certificate.isNotEmpty) {
+    print("Using TLS");
+    if (config.tls_server_name.isNotEmpty)
+      creds = ChannelCredentials.secure(certificates: config.ca_certificate, authority: config.tls_server_name);
+    else
+      creds = ChannelCredentials.secure(certificates: config.ca_certificate);
+  } else {
+    creds = ChannelCredentials.insecure();
+  }
+  final channel = ClientChannel(config.hostname,
+          port: config.port,
+          options: ChannelOptions(credentials: creds));
+
+  final stub = VALClient(channel);
+
+  return HomescreenVssClient(config: config, channel: channel, stub: stub, ref: ref);
+});