Implementation of Persistent Storage API to the flutter homescreen

Added protobuf definition of Persistent Storage API.
Generated grpc-compliant code from protobuf API definition.
Set up storage_client based on similar radio_client.
Updated app_confi_provider and app_provider to include new API features
and prepare for implementation of persistent storage of users, user
preferences.
Added unit tests for all API rpcs.

Bug-AGL: [SPEC-5227]
Change-Id: I759501bcb9de3a70a14718f8b3a87bedcf811baa
Signed-off-by: Tom Kronsbein <tom.kronsbein@d-fine.com>
Signed-off-by: Ludwig Schwiedrzik <ludwig.schwiedrzik@d-fine.com>

6 files changed, 924 insertions, 0 deletions

diff --git a/protos/lib/src/generated/storage_api.pb.dart b/protos/lib/src/generated/storage_api.pb.dart
new file mode 100644
index 0000000..fb027be
--- /dev/null
+++ b/protos/lib/src/generated/storage_api.pb.dart
@@ -0,0 +1,534 @@
+//
+//  Generated code. Do not modify.
+//  source: protos/protos/storage_api.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:core' as $core;
+
+import 'package:protobuf/protobuf.dart' as $pb;
+
+class Key extends $pb.GeneratedMessage {
+  factory Key({
+    $core.String? key,
+    $core.String? namespace,
+  }) {
+    final $result = create();
+    if (key != null) {
+      $result.key = key;
+    }
+    if (namespace != null) {
+      $result.namespace = namespace;
+    }
+    return $result;
+  }
+  Key._() : super();
+  factory Key.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory Key.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'Key', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'key')
+    ..aOS(2, _omitFieldNames ? '' : 'namespace')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  Key clone() => Key()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  Key copyWith(void Function(Key) updates) => super.copyWith((message) => updates(message as Key)) as Key;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static Key create() => Key._();
+  Key createEmptyInstance() => create();
+  static $pb.PbList<Key> createRepeated() => $pb.PbList<Key>();
+  @$core.pragma('dart2js:noInline')
+  static Key getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Key>(create);
+  static Key? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get key => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set key($core.String v) { $_setString(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasKey() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearKey() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.String get namespace => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set namespace($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasNamespace() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearNamespace() => clearField(2);
+}
+
+class Value extends $pb.GeneratedMessage {
+  factory Value({
+    $core.String? value,
+  }) {
+    final $result = create();
+    if (value != null) {
+      $result.value = value;
+    }
+    return $result;
+  }
+  Value._() : super();
+  factory Value.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory Value.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'Value', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'value')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  Value clone() => Value()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  Value copyWith(void Function(Value) updates) => super.copyWith((message) => updates(message as Value)) as Value;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static Value create() => Value._();
+  Value createEmptyInstance() => create();
+  static $pb.PbList<Value> createRepeated() => $pb.PbList<Value>();
+  @$core.pragma('dart2js:noInline')
+  static Value getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Value>(create);
+  static Value? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get value => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set value($core.String v) { $_setString(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasValue() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearValue() => clearField(1);
+}
+
+class KeyValue extends $pb.GeneratedMessage {
+  factory KeyValue({
+    $core.String? key,
+    $core.String? value,
+    $core.String? namespace,
+  }) {
+    final $result = create();
+    if (key != null) {
+      $result.key = key;
+    }
+    if (value != null) {
+      $result.value = value;
+    }
+    if (namespace != null) {
+      $result.namespace = namespace;
+    }
+    return $result;
+  }
+  KeyValue._() : super();
+  factory KeyValue.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory KeyValue.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'KeyValue', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'key')
+    ..aOS(2, _omitFieldNames ? '' : 'value')
+    ..aOS(3, _omitFieldNames ? '' : 'namespace')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  KeyValue clone() => KeyValue()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  KeyValue copyWith(void Function(KeyValue) updates) => super.copyWith((message) => updates(message as KeyValue)) as KeyValue;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static KeyValue create() => KeyValue._();
+  KeyValue createEmptyInstance() => create();
+  static $pb.PbList<KeyValue> createRepeated() => $pb.PbList<KeyValue>();
+  @$core.pragma('dart2js:noInline')
+  static KeyValue getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<KeyValue>(create);
+  static KeyValue? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get key => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set key($core.String v) { $_setString(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasKey() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearKey() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.String get value => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set value($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasValue() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearValue() => clearField(2);
+
+  @$pb.TagNumber(3)
+  $core.String get namespace => $_getSZ(2);
+  @$pb.TagNumber(3)
+  set namespace($core.String v) { $_setString(2, v); }
+  @$pb.TagNumber(3)
+  $core.bool hasNamespace() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearNamespace() => clearField(3);
+}
+
+class SubtreeInfo extends $pb.GeneratedMessage {
+  factory SubtreeInfo({
+    $core.String? node,
+    $core.int? layers,
+    $core.String? namespace,
+  }) {
+    final $result = create();
+    if (node != null) {
+      $result.node = node;
+    }
+    if (layers != null) {
+      $result.layers = layers;
+    }
+    if (namespace != null) {
+      $result.namespace = namespace;
+    }
+    return $result;
+  }
+  SubtreeInfo._() : super();
+  factory SubtreeInfo.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory SubtreeInfo.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'SubtreeInfo', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'node')
+    ..a<$core.int>(2, _omitFieldNames ? '' : 'layers', $pb.PbFieldType.O3)
+    ..aOS(3, _omitFieldNames ? '' : 'namespace')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  SubtreeInfo clone() => SubtreeInfo()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  SubtreeInfo copyWith(void Function(SubtreeInfo) updates) => super.copyWith((message) => updates(message as SubtreeInfo)) as SubtreeInfo;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static SubtreeInfo create() => SubtreeInfo._();
+  SubtreeInfo createEmptyInstance() => create();
+  static $pb.PbList<SubtreeInfo> createRepeated() => $pb.PbList<SubtreeInfo>();
+  @$core.pragma('dart2js:noInline')
+  static SubtreeInfo getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<SubtreeInfo>(create);
+  static SubtreeInfo? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get node => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set node($core.String v) { $_setString(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasNode() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearNode() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.int get layers => $_getIZ(1);
+  @$pb.TagNumber(2)
+  set layers($core.int v) { $_setSignedInt32(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasLayers() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearLayers() => clearField(2);
+
+  @$pb.TagNumber(3)
+  $core.String get namespace => $_getSZ(2);
+  @$pb.TagNumber(3)
+  set namespace($core.String v) { $_setString(2, v); }
+  @$pb.TagNumber(3)
+  $core.bool hasNamespace() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearNamespace() => clearField(3);
+}
+
+class DestroyArguments extends $pb.GeneratedMessage {
+  factory DestroyArguments() => create();
+  DestroyArguments._() : super();
+  factory DestroyArguments.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory DestroyArguments.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'DestroyArguments', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  DestroyArguments clone() => DestroyArguments()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  DestroyArguments copyWith(void Function(DestroyArguments) updates) => super.copyWith((message) => updates(message as DestroyArguments)) as DestroyArguments;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static DestroyArguments create() => DestroyArguments._();
+  DestroyArguments createEmptyInstance() => create();
+  static $pb.PbList<DestroyArguments> createRepeated() => $pb.PbList<DestroyArguments>();
+  @$core.pragma('dart2js:noInline')
+  static DestroyArguments getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<DestroyArguments>(create);
+  static DestroyArguments? _defaultInstance;
+}
+
+class StandardResponse extends $pb.GeneratedMessage {
+  factory StandardResponse({
+    $core.bool? success,
+    $core.String? message,
+  }) {
+    final $result = create();
+    if (success != null) {
+      $result.success = success;
+    }
+    if (message != null) {
+      $result.message = message;
+    }
+    return $result;
+  }
+  StandardResponse._() : super();
+  factory StandardResponse.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory StandardResponse.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'StandardResponse', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOB(1, _omitFieldNames ? '' : 'success')
+    ..aOS(2, _omitFieldNames ? '' : 'message')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  StandardResponse clone() => StandardResponse()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  StandardResponse copyWith(void Function(StandardResponse) updates) => super.copyWith((message) => updates(message as StandardResponse)) as StandardResponse;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static StandardResponse create() => StandardResponse._();
+  StandardResponse createEmptyInstance() => create();
+  static $pb.PbList<StandardResponse> createRepeated() => $pb.PbList<StandardResponse>();
+  @$core.pragma('dart2js:noInline')
+  static StandardResponse getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<StandardResponse>(create);
+  static StandardResponse? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.bool get success => $_getBF(0);
+  @$pb.TagNumber(1)
+  set success($core.bool v) { $_setBool(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasSuccess() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSuccess() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.String get message => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set message($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasMessage() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearMessage() => clearField(2);
+}
+
+class ReadResponse extends $pb.GeneratedMessage {
+  factory ReadResponse({
+    $core.bool? success,
+    $core.String? message,
+    $core.String? result,
+  }) {
+    final $result = create();
+    if (success != null) {
+      $result.success = success;
+    }
+    if (message != null) {
+      $result.message = message;
+    }
+    if (result != null) {
+      $result.result = result;
+    }
+    return $result;
+  }
+  ReadResponse._() : super();
+  factory ReadResponse.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory ReadResponse.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'ReadResponse', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOB(1, _omitFieldNames ? '' : 'success')
+    ..aOS(2, _omitFieldNames ? '' : 'message')
+    ..aOS(3, _omitFieldNames ? '' : 'result')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  ReadResponse clone() => ReadResponse()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  ReadResponse copyWith(void Function(ReadResponse) updates) => super.copyWith((message) => updates(message as ReadResponse)) as ReadResponse;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static ReadResponse create() => ReadResponse._();
+  ReadResponse createEmptyInstance() => create();
+  static $pb.PbList<ReadResponse> createRepeated() => $pb.PbList<ReadResponse>();
+  @$core.pragma('dart2js:noInline')
+  static ReadResponse getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<ReadResponse>(create);
+  static ReadResponse? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.bool get success => $_getBF(0);
+  @$pb.TagNumber(1)
+  set success($core.bool v) { $_setBool(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasSuccess() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSuccess() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.String get message => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set message($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasMessage() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearMessage() => clearField(2);
+
+  @$pb.TagNumber(3)
+  $core.String get result => $_getSZ(2);
+  @$pb.TagNumber(3)
+  set result($core.String v) { $_setString(2, v); }
+  @$pb.TagNumber(3)
+  $core.bool hasResult() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearResult() => clearField(3);
+}
+
+class ListResponse extends $pb.GeneratedMessage {
+  factory ListResponse({
+    $core.bool? success,
+    $core.String? message,
+    $core.Iterable<$core.String>? result,
+  }) {
+    final $result = create();
+    if (success != null) {
+      $result.success = success;
+    }
+    if (message != null) {
+      $result.message = message;
+    }
+    if (result != null) {
+      $result.result.addAll(result);
+    }
+    return $result;
+  }
+  ListResponse._() : super();
+  factory ListResponse.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory ListResponse.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'ListResponse', package: const $pb.PackageName(_omitMessageNames ? '' : 'storage_api'), createEmptyInstance: create)
+    ..aOB(1, _omitFieldNames ? '' : 'success')
+    ..aOS(2, _omitFieldNames ? '' : 'message')
+    ..pPS(3, _omitFieldNames ? '' : 'result')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  ListResponse clone() => ListResponse()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  ListResponse copyWith(void Function(ListResponse) updates) => super.copyWith((message) => updates(message as ListResponse)) as ListResponse;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static ListResponse create() => ListResponse._();
+  ListResponse createEmptyInstance() => create();
+  static $pb.PbList<ListResponse> createRepeated() => $pb.PbList<ListResponse>();
+  @$core.pragma('dart2js:noInline')
+  static ListResponse getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<ListResponse>(create);
+  static ListResponse? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.bool get success => $_getBF(0);
+  @$pb.TagNumber(1)
+  set success($core.bool v) { $_setBool(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasSuccess() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSuccess() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.String get message => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set message($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasMessage() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearMessage() => clearField(2);
+
+  @$pb.TagNumber(3)
+  $core.List<$core.String> get result => $_getList(2);
+}
+
+
+const _omitFieldNames = $core.bool.fromEnvironment('protobuf.omit_field_names');
+const _omitMessageNames = $core.bool.fromEnvironment('protobuf.omit_message_names');
diff --git a/protos/lib/src/generated/storage_api.pbenum.dart b/protos/lib/src/generated/storage_api.pbenum.dart
new file mode 100644
index 0000000..8c2646e
--- /dev/null
+++ b/protos/lib/src/generated/storage_api.pbenum.dart
@@ -0,0 +1,11 @@
+//
+//  Generated code. Do not modify.
+//  source: protos/protos/storage_api.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
diff --git a/protos/lib/src/generated/storage_api.pbgrpc.dart b/protos/lib/src/generated/storage_api.pbgrpc.dart
new file mode 100644
index 0000000..8bdd848
--- /dev/null
+++ b/protos/lib/src/generated/storage_api.pbgrpc.dart
@@ -0,0 +1,179 @@
+//
+//  Generated code. Do not modify.
+//  source: protos/protos/storage_api.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:async' as $async;
+import 'dart:core' as $core;
+
+import 'package:grpc/service_api.dart' as $grpc;
+import 'package:protobuf/protobuf.dart' as $pb;
+
+import 'storage_api.pb.dart' as $0;
+
+export 'storage_api.pb.dart';
+
+@$pb.GrpcServiceName('storage_api.Database')
+class DatabaseClient extends $grpc.Client {
+  static final _$destroyDB = $grpc.ClientMethod<$0.DestroyArguments, $0.StandardResponse>(
+      '/storage_api.Database/DestroyDB',
+      ($0.DestroyArguments value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.StandardResponse.fromBuffer(value));
+  static final _$write = $grpc.ClientMethod<$0.KeyValue, $0.StandardResponse>(
+      '/storage_api.Database/Write',
+      ($0.KeyValue value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.StandardResponse.fromBuffer(value));
+  static final _$read = $grpc.ClientMethod<$0.Key, $0.ReadResponse>(
+      '/storage_api.Database/Read',
+      ($0.Key value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.ReadResponse.fromBuffer(value));
+  static final _$delete = $grpc.ClientMethod<$0.Key, $0.StandardResponse>(
+      '/storage_api.Database/Delete',
+      ($0.Key value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.StandardResponse.fromBuffer(value));
+  static final _$search = $grpc.ClientMethod<$0.Key, $0.ListResponse>(
+      '/storage_api.Database/Search',
+      ($0.Key value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.ListResponse.fromBuffer(value));
+  static final _$deleteNodes = $grpc.ClientMethod<$0.Key, $0.StandardResponse>(
+      '/storage_api.Database/DeleteNodes',
+      ($0.Key value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.StandardResponse.fromBuffer(value));
+  static final _$listNodes = $grpc.ClientMethod<$0.SubtreeInfo, $0.ListResponse>(
+      '/storage_api.Database/ListNodes',
+      ($0.SubtreeInfo value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.ListResponse.fromBuffer(value));
+
+  DatabaseClient($grpc.ClientChannel channel,
+      {$grpc.CallOptions? options,
+      $core.Iterable<$grpc.ClientInterceptor>? interceptors})
+      : super(channel, options: options,
+        interceptors: interceptors);
+
+  $grpc.ResponseFuture<$0.StandardResponse> destroyDB($0.DestroyArguments request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$destroyDB, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.StandardResponse> write($0.KeyValue request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$write, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.ReadResponse> read($0.Key request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$read, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.StandardResponse> delete($0.Key request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$delete, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.ListResponse> search($0.Key request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$search, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.StandardResponse> deleteNodes($0.Key request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$deleteNodes, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.ListResponse> listNodes($0.SubtreeInfo request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$listNodes, request, options: options);
+  }
+}
+
+@$pb.GrpcServiceName('storage_api.Database')
+abstract class DatabaseServiceBase extends $grpc.Service {
+  $core.String get $name => 'storage_api.Database';
+
+  DatabaseServiceBase() {
+    $addMethod($grpc.ServiceMethod<$0.DestroyArguments, $0.StandardResponse>(
+        'DestroyDB',
+        destroyDB_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.DestroyArguments.fromBuffer(value),
+        ($0.StandardResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.KeyValue, $0.StandardResponse>(
+        'Write',
+        write_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.KeyValue.fromBuffer(value),
+        ($0.StandardResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.Key, $0.ReadResponse>(
+        'Read',
+        read_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.Key.fromBuffer(value),
+        ($0.ReadResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.Key, $0.StandardResponse>(
+        'Delete',
+        delete_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.Key.fromBuffer(value),
+        ($0.StandardResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.Key, $0.ListResponse>(
+        'Search',
+        search_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.Key.fromBuffer(value),
+        ($0.ListResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.Key, $0.StandardResponse>(
+        'DeleteNodes',
+        deleteNodes_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.Key.fromBuffer(value),
+        ($0.StandardResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.SubtreeInfo, $0.ListResponse>(
+        'ListNodes',
+        listNodes_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.SubtreeInfo.fromBuffer(value),
+        ($0.ListResponse value) => value.writeToBuffer()));
+  }
+
+  $async.Future<$0.StandardResponse> destroyDB_Pre($grpc.ServiceCall call, $async.Future<$0.DestroyArguments> request) async {
+    return destroyDB(call, await request);
+  }
+
+  $async.Future<$0.StandardResponse> write_Pre($grpc.ServiceCall call, $async.Future<$0.KeyValue> request) async {
+    return write(call, await request);
+  }
+
+  $async.Future<$0.ReadResponse> read_Pre($grpc.ServiceCall call, $async.Future<$0.Key> request) async {
+    return read(call, await request);
+  }
+
+  $async.Future<$0.StandardResponse> delete_Pre($grpc.ServiceCall call, $async.Future<$0.Key> request) async {
+    return delete(call, await request);
+  }
+
+  $async.Future<$0.ListResponse> search_Pre($grpc.ServiceCall call, $async.Future<$0.Key> request) async {
+    return search(call, await request);
+  }
+
+  $async.Future<$0.StandardResponse> deleteNodes_Pre($grpc.ServiceCall call, $async.Future<$0.Key> request) async {
+    return deleteNodes(call, await request);
+  }
+
+  $async.Future<$0.ListResponse> listNodes_Pre($grpc.ServiceCall call, $async.Future<$0.SubtreeInfo> request) async {
+    return listNodes(call, await request);
+  }
+
+  $async.Future<$0.StandardResponse> destroyDB($grpc.ServiceCall call, $0.DestroyArguments request);
+  $async.Future<$0.StandardResponse> write($grpc.ServiceCall call, $0.KeyValue request);
+  $async.Future<$0.ReadResponse> read($grpc.ServiceCall call, $0.Key request);
+  $async.Future<$0.StandardResponse> delete($grpc.ServiceCall call, $0.Key request);
+  $async.Future<$0.ListResponse> search($grpc.ServiceCall call, $0.Key request);
+  $async.Future<$0.StandardResponse> deleteNodes($grpc.ServiceCall call, $0.Key request);
+  $async.Future<$0.ListResponse> listNodes($grpc.ServiceCall call, $0.SubtreeInfo request);
+}
diff --git a/protos/lib/src/generated/storage_api.pbjson.dart b/protos/lib/src/generated/storage_api.pbjson.dart
new file mode 100644
index 0000000..f697b4b
--- /dev/null
+++ b/protos/lib/src/generated/storage_api.pbjson.dart
@@ -0,0 +1,126 @@
+//
+//  Generated code. Do not modify.
+//  source: protos/protos/storage_api.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:convert' as $convert;
+import 'dart:core' as $core;
+import 'dart:typed_data' as $typed_data;
+
+@$core.Deprecated('Use keyDescriptor instead')
+const Key$json = {
+  '1': 'Key',
+  '2': [
+    {'1': 'key', '3': 1, '4': 1, '5': 9, '10': 'key'},
+    {'1': 'namespace', '3': 2, '4': 1, '5': 9, '10': 'namespace'},
+  ],
+};
+
+/// Descriptor for `Key`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List keyDescriptor = $convert.base64Decode(
+    'CgNLZXkSEAoDa2V5GAEgASgJUgNrZXkSHAoJbmFtZXNwYWNlGAIgASgJUgluYW1lc3BhY2U=');
+
+@$core.Deprecated('Use valueDescriptor instead')
+const Value$json = {
+  '1': 'Value',
+  '2': [
+    {'1': 'value', '3': 1, '4': 1, '5': 9, '10': 'value'},
+  ],
+};
+
+/// Descriptor for `Value`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List valueDescriptor = $convert.base64Decode(
+    'CgVWYWx1ZRIUCgV2YWx1ZRgBIAEoCVIFdmFsdWU=');
+
+@$core.Deprecated('Use keyValueDescriptor instead')
+const KeyValue$json = {
+  '1': 'KeyValue',
+  '2': [
+    {'1': 'key', '3': 1, '4': 1, '5': 9, '10': 'key'},
+    {'1': 'value', '3': 2, '4': 1, '5': 9, '10': 'value'},
+    {'1': 'namespace', '3': 3, '4': 1, '5': 9, '10': 'namespace'},
+  ],
+};
+
+/// Descriptor for `KeyValue`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List keyValueDescriptor = $convert.base64Decode(
+    'CghLZXlWYWx1ZRIQCgNrZXkYASABKAlSA2tleRIUCgV2YWx1ZRgCIAEoCVIFdmFsdWUSHAoJbm'
+    'FtZXNwYWNlGAMgASgJUgluYW1lc3BhY2U=');
+
+@$core.Deprecated('Use subtreeInfoDescriptor instead')
+const SubtreeInfo$json = {
+  '1': 'SubtreeInfo',
+  '2': [
+    {'1': 'node', '3': 1, '4': 1, '5': 9, '10': 'node'},
+    {'1': 'layers', '3': 2, '4': 1, '5': 5, '9': 0, '10': 'layers', '17': true},
+    {'1': 'namespace', '3': 3, '4': 1, '5': 9, '10': 'namespace'},
+  ],
+  '8': [
+    {'1': '_layers'},
+  ],
+};
+
+/// Descriptor for `SubtreeInfo`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List subtreeInfoDescriptor = $convert.base64Decode(
+    'CgtTdWJ0cmVlSW5mbxISCgRub2RlGAEgASgJUgRub2RlEhsKBmxheWVycxgCIAEoBUgAUgZsYX'
+    'llcnOIAQESHAoJbmFtZXNwYWNlGAMgASgJUgluYW1lc3BhY2VCCQoHX2xheWVycw==');
+
+@$core.Deprecated('Use destroyArgumentsDescriptor instead')
+const DestroyArguments$json = {
+  '1': 'DestroyArguments',
+};
+
+/// Descriptor for `DestroyArguments`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List destroyArgumentsDescriptor = $convert.base64Decode(
+    'ChBEZXN0cm95QXJndW1lbnRz');
+
+@$core.Deprecated('Use standardResponseDescriptor instead')
+const StandardResponse$json = {
+  '1': 'StandardResponse',
+  '2': [
+    {'1': 'success', '3': 1, '4': 1, '5': 8, '10': 'success'},
+    {'1': 'message', '3': 2, '4': 1, '5': 9, '10': 'message'},
+  ],
+};
+
+/// Descriptor for `StandardResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List standardResponseDescriptor = $convert.base64Decode(
+    'ChBTdGFuZGFyZFJlc3BvbnNlEhgKB3N1Y2Nlc3MYASABKAhSB3N1Y2Nlc3MSGAoHbWVzc2FnZR'
+    'gCIAEoCVIHbWVzc2FnZQ==');
+
+@$core.Deprecated('Use readResponseDescriptor instead')
+const ReadResponse$json = {
+  '1': 'ReadResponse',
+  '2': [
+    {'1': 'success', '3': 1, '4': 1, '5': 8, '10': 'success'},
+    {'1': 'message', '3': 2, '4': 1, '5': 9, '10': 'message'},
+    {'1': 'result', '3': 3, '4': 1, '5': 9, '10': 'result'},
+  ],
+};
+
+/// Descriptor for `ReadResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List readResponseDescriptor = $convert.base64Decode(
+    'CgxSZWFkUmVzcG9uc2USGAoHc3VjY2VzcxgBIAEoCFIHc3VjY2VzcxIYCgdtZXNzYWdlGAIgAS'
+    'gJUgdtZXNzYWdlEhYKBnJlc3VsdBgDIAEoCVIGcmVzdWx0');
+
+@$core.Deprecated('Use listResponseDescriptor instead')
+const ListResponse$json = {
+  '1': 'ListResponse',
+  '2': [
+    {'1': 'success', '3': 1, '4': 1, '5': 8, '10': 'success'},
+    {'1': 'message', '3': 2, '4': 1, '5': 9, '10': 'message'},
+    {'1': 'result', '3': 3, '4': 3, '5': 9, '10': 'result'},
+  ],
+};
+
+/// Descriptor for `ListResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listResponseDescriptor = $convert.base64Decode(
+    'CgxMaXN0UmVzcG9uc2USGAoHc3VjY2VzcxgBIAEoCFIHc3VjY2VzcxIYCgdtZXNzYWdlGAIgAS'
+    'gJUgdtZXNzYWdlEhYKBnJlc3VsdBgDIAMoCVIGcmVzdWx0');
+
diff --git a/protos/lib/storage-api.dart b/protos/lib/storage-api.dart
new file mode 100644
index 0000000..eccfb04
--- /dev/null
+++ b/protos/lib/storage-api.dart
@@ -0,0 +1,8 @@
+library storage_api;
+
+export 'src/generated/storage_api.pb.dart';
+export 'src/generated/storage_api.pbenum.dart';
+export 'src/generated/storage_api.pbgrpc.dart';
+export 'src/generated/storage_api.pbjson.dart';
+
+export 'package:grpc/grpc.dart';
\ No newline at end of file
diff --git a/protos/protos/storage_api.proto b/protos/protos/storage_api.proto
new file mode 100644
index 0000000..90272e8
--- /dev/null
+++ b/protos/protos/storage_api.proto
@@ -0,0 +1,66 @@
+syntax = "proto3";
+
+package storage_api;
+
+service Database {
+    // Deletes the entire data base.
+    rpc DestroyDB(DestroyArguments) returns (StandardResponse);
+
+    // Writes a key-value pair to the data base
+    rpc Write(KeyValue) returns (StandardResponse);
+
+    // Reads the value for the given key from the data base.
+    rpc Read(Key) returns (ReadResponse);
+
+    // Deletes the entry for the given key from the data base.
+    rpc Delete(Key) returns (StandardResponse);
+
+    // Lists any keys that contain the given string.
+    rpc Search(Key) returns (ListResponse);
+
+    // Deletes all keys in subtree of given root. Assumes that keys follow VSS-like tress structure.
+    rpc DeleteNodes(Key) returns (StandardResponse);
+
+    // Lists all nodes in subtree of given root and depth. Assumes that keys follow VSS-like tress structure.
+    rpc ListNodes(SubtreeInfo) returns (ListResponse);
+}
+
+message Key {
+    string key = 1;
+    string namespace = 2;
+}
+
+message Value {
+    string value = 1;
+}
+
+message KeyValue {
+    string key = 1;
+    string value = 2;
+    string namespace = 3;
+}
+
+message SubtreeInfo {
+    string node = 1;
+    optional int32 layers = 2;
+    string namespace = 3;
+}
+
+message DestroyArguments {}
+
+message StandardResponse {
+    bool success = 1;
+    string message = 2;
+}
+
+message ReadResponse {
+    bool success = 1;
+    string message = 2;
+    string result = 3;
+}
+
+message ListResponse {
+    bool success = 1;
+    string message = 2;
+    repeated string result = 3;
+}