Add AnkiDroid service and AnkiDroid customizations

Most of the work here was done by David in the Backend repo; I've just
moved it into an rslib patch so it can take advantage of the existing
backend infrastructure.

proto/anki/ankidroid.proto

@@ -0,0 +1,71 @@
+syntax = "proto3";
+
+option java_multiple_files = true;
+
+import "anki/generic.proto";
+import "anki/scheduler.proto";
+
+package anki.ankidroid;
+
+service AnkidroidService {
+	rpc SchedTimingTodayLegacy (SchedTimingTodayLegacyRequest) returns (scheduler.SchedTimingTodayResponse);
+	rpc LocalMinutesWestLegacy (generic.Int64) returns (generic.Int32);
+	rpc RunDbCommand(generic.Json) returns (generic.Json);
+	rpc RunDbCommandProto(generic.Json) returns (DBResponse);
+	rpc InsertForId(generic.Json) returns (generic.Int64);
+	rpc RunDbCommandForRowCount(generic.Json) returns (generic.Int64);
+	rpc FlushAllQueries(generic.Empty) returns (generic.Empty);
+	rpc FlushQuery(generic.Int32) returns (generic.Empty);
+	rpc GetNextResultPage(GetNextResultPageRequest) returns (DBResponse);
+	rpc SetPageSize(generic.Int64) returns (generic.Empty);
+	rpc GetColumnNamesFromQuery(generic.String) returns (generic.StringList);
+	rpc GetActiveSequenceNumbers(generic.Empty) returns (GetActiveSequenceNumbersResponse);
+	rpc DebugProduceError(generic.String) returns (generic.Empty);
+}
+
+message DebugActiveDatabaseSequenceNumbersResponse {
+    repeated int32 sequence_numbers = 1;
+}
+
+message SchedTimingTodayLegacyRequest {
+    int64 created_secs = 1;
+    optional sint32 created_mins_west = 2;
+    int64 now_secs = 3;
+    sint32 now_mins_west = 4;
+    sint32 rollover_hour = 5;
+}
+
+// We expect in Java: Null, String, Short, Int, Long, Float, Double, Boolean, Blob (unused)
+// We get: DbResult (Null, String, i64, f64, Vec<u8>), which matches SQLite documentation
+message SqlValue {
+    oneof Data {
+        string stringValue = 1;
+		int64 longValue = 2;
+		double doubleValue = 3;
+		bytes blobValue = 4;
+    }
+}
+
+message Row {
+	repeated SqlValue fields = 1;
+}
+
+message DbResult {
+	repeated Row rows = 1;
+}
+
+message DBResponse {
+	DbResult result = 1;
+	int32 sequenceNumber = 2;
+	int32 rowCount = 3;
+	int64 startIndex = 4;
+}
+
+message GetNextResultPageRequest {
+	int32 sequence = 1;
+	int64 index = 2;
+}
+
+message GetActiveSequenceNumbersResponse {
+	repeated int32 numbers = 1;
+}

proto/anki/backend.proto

@@ -30,6 +30,8 @@ enum ServiceIndex {
   SERVICE_INDEX_CARDS = 14;
   SERVICE_INDEX_LINKS = 15;
   SERVICE_INDEX_IMPORT_EXPORT = 16;
+
+  SERVICE_INDEX_ANKIDROID = 99;
 }
 
 message BackendInit {
@@ -64,6 +66,7 @@ message BackendError {
     IMPORT_ERROR = 16;
     DELETED = 17;
     CARD_TYPE_ERROR = 18;
+    FATAL_ERROR = 99;
   }
 
   // localized error description suitable for displaying to the user

proto/anki/collection.proto

@@ -35,6 +35,8 @@ message OpenCollectionRequest {
   string media_folder_path = 2;
   string media_db_path = 3;
   string log_path = 4;
+
+  bool force_schema11 = 99;
 }
 
 message CloseCollectionRequest {

rslib/.gitignore

@@ -1,3 +1,4 @@
 Cargo.lock
 .build
+.idea/
 target

rslib/Cargo.toml

@@ -67,7 +67,6 @@ reqwest = { git="https://github.com/ankitects/reqwest.git", rev="7591444614de02b
     "stream",
     "multipart",
     # the Bazel build scripts separate these out by platform
-    "native-tls",
     "rustls-tls",
     "rustls-tls-webpki-roots",
     "rustls-tls-native-roots",