Port Brave Sync server to Rust

Use SQLite for persistence and generate Rust protobuf bindings at build time.

Add Docker image support for containerized deployment.

Co-Authored-By: codex <[email protected]>

schema/protobuf/sync_pb/client_debug_info.proto

@@ -0,0 +1,94 @@
+// Copyright 2012 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Sync protocol for debug info clients can send to the sync server.
+
+// If you change or add any fields in this file, update proto_visitors.h and
+// potentially proto_enum_conversions.{h, cc}.
+
+syntax = "proto2";
+
+option go_package = "./sync_pb";
+
+option java_multiple_files = true;
+option java_package = "org.chromium.components.sync.protocol";
+
+option optimize_for = LITE_RUNTIME;
+
+package sync_pb;
+
+import "get_updates_caller_info.proto";
+import "sync_enums.proto";
+
+// Per-type hint information.
+message TypeHint {
+  // The data type this hint applied to.
+  optional int32 data_type_id = 1;
+
+  // Whether or not a valid hint is provided.
+  optional bool has_valid_hint = 2;
+}
+
+// The additional info here is from the StatusController. They get sent when
+// the event SYNC_CYCLE_COMPLETED  is sent.
+message SyncCycleCompletedEventInfo {
+  reserved 1;
+  reserved "syncer_stuck";
+  reserved 2;
+  reserved "num_blocking_conflicts";
+  reserved 3;
+  reserved "num_non_blocking_conflicts";
+
+  // These new conflict counters replace the ones above.
+  // TODO(crbug.com/1315573): Deprecated in M103.
+  optional int32 num_encryption_conflicts = 4 [deprecated = true];
+  optional int32 num_hierarchy_conflicts = 5 [deprecated = true];
+  optional int32 num_simple_conflicts = 6;  // No longer sent since M24.
+  optional int32 num_server_conflicts = 7;
+
+  // Counts to track the effective usefulness of our GetUpdate requests.
+  optional int32 num_updates_downloaded = 8;
+  // TODO(crbug.com/1315573): Deprecated in M103.
+  optional int32 num_reflected_updates_downloaded = 9 [deprecated = true];
+
+  // |caller_info| was mostly replaced by |get_updates_origin|; now it only
+  // contains the |notifications_enabled| flag.
+  optional GetUpdatesCallerInfo caller_info = 10;
+
+  // Deprecated in M67.
+  reserved 11;
+  reserved "source_info";
+
+  optional SyncEnums.GetUpdatesOrigin get_updates_origin = 12;
+}
+
+message DebugEventInfo {
+  // Each of the following fields correspond to different kinds of events. as
+  // a result, only one is set during any single DebugEventInfo.
+  // A singleton event. See enum definition.
+  optional SyncEnums.SingletonDebugEventType singleton_event = 1;
+  // A sync cycle completed.
+  optional SyncCycleCompletedEventInfo sync_cycle_completed_event_info = 2;
+  // A datatype triggered a nudge.
+  optional int32 nudging_datatype = 3;
+  // A notification triggered a nudge.
+  repeated int32 datatypes_notified_from_server = 4;
+
+  reserved "datatype_association_stats";
+  reserved 5;
+}
+
+message DebugInfo {
+  repeated DebugEventInfo events = 1;
+
+  // Whether cryptographer is ready to encrypt and decrypt data.
+  optional bool cryptographer_ready = 2;
+
+  // Cryptographer has pending keys which indicates the correct passphrase
+  // has not been provided yet.
+  optional bool cryptographer_has_pending_keys = 3;
+
+  // Indicates client has dropped some events to save bandwidth.
+  optional bool events_dropped = 4;
+}