mirror of
https://gitlab.com/veilid/veilid.git
synced 2024-10-01 01:26:08 -04:00
251 lines
8.4 KiB
Dart
251 lines
8.4 KiB
Dart
import 'dart:async';
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import 'dart:ffi';
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import 'dart:io';
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import 'dart:isolate';
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import 'dart:convert';
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import 'package:ffi/ffi.dart';
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import 'veilid.dart';
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//////////////////////////////////////////////////////////
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// Load the veilid_flutter library once
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const _base = 'veilid_flutter';
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final _path = Platform.isWindows
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? '$_base.dll'
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: Platform.isMacOS
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? 'lib$_base.dylib'
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: 'lib$_base.so';
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late final _dylib =
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Platform.isIOS ? DynamicLibrary.process() : DynamicLibrary.open(_path);
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// Linkage for initialization
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typedef _dart_postCObject
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= NativeFunction<Int8 Function(Int64, Pointer<Dart_CObject>)>;
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// fn free_string(s: *mut std::os::raw::c_char)
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typedef _free_string_C = Void Function(Pointer<Utf8>);
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typedef _free_string_Dart = void Function(Pointer<Utf8>);
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// fn initialize_veilid_flutter(dart_post_c_object_ptr: ffi::DartPostCObjectFnType)
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typedef _initializeVeilidFlutter_C = Void Function(Pointer<_dart_postCObject>);
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typedef _initializeVeilidFlutter_Dart = void Function(
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Pointer<_dart_postCObject>);
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// fn startup_veilid_core(port: i64, config: FfiStr)
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typedef _startup_veilid_core_C = Void Function(Int64, Pointer<Utf8>);
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typedef _startup_veilid_core_Dart = void Function(int, Pointer<Utf8>);
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// fn get_veilid_state(port: i64)
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typedef _get_veilid_state_C = Void Function(Int64);
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typedef _get_veilid_state_Dart = void Function(int);
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// fn change_api_log_level(port: i64, log_level: FfiStr)
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typedef _change_api_log_level_C = Void Function(Int64, Pointer<Utf8>);
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typedef _change_api_log_level_Dart = void Function(int, Pointer<Utf8>);
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// fn shutdown_veilid_core(port: i64)
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typedef _shutdown_veilid_core_C = Void Function(Int64);
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typedef _shutdown_veilid_core_Dart = void Function(int);
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// fn veilid_version_string() -> *mut c_char
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typedef _veilid_version_string_C = Pointer<Utf8> Function();
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typedef _veilid_version_string_Dart = Pointer<Utf8> Function();
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// fn veilid_version() -> VeilidVersion
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class VeilidVersionFFI extends Struct {
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@Uint32()
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external int major;
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@Uint32()
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external int minor;
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@Uint32()
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external int patch;
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}
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typedef _veilid_version_C = VeilidVersionFFI Function();
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typedef _veilid_version_Dart = VeilidVersionFFI Function();
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// Async message types
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const int MESSAGE_OK = 0;
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const int MESSAGE_ERR = 1;
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const int MESSAGE_OK_JSON = 2;
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const int MESSAGE_ERR_JSON = 3;
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const int MESSAGE_STREAM_ITEM = 4;
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const int MESSAGE_STREAM_ITEM_JSON = 5;
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const int MESSAGE_STREAM_ABORT = 6;
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const int MESSAGE_STREAM_ABORT_JSON = 7;
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const int MESSAGE_STREAM_CLOSE = 8;
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// Interface factory for high level Veilid API
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Veilid getVeilid() => VeilidFFI(_dylib);
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// Parse handle async returns
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Future<T> processSingleAsyncReturn<T>(Future<dynamic> future) async {
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return future.then((value) {
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final list = value as List<dynamic>;
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switch (list[0] as int) {
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case MESSAGE_OK:
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{
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if (list[1] != null) {
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throw VeilidAPIExceptionInternal(
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"Unexpected MESSAGE_OK value '${list[1]}' where null expected");
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}
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return list[1] as T;
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}
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case MESSAGE_ERR:
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{
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throw VeilidAPIExceptionInternal("Internal API Error: ${value[1]}");
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}
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case MESSAGE_OK_JSON:
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{
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var ret = jsonDecode(list[1] as String);
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if (ret != null) {
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throw VeilidAPIExceptionInternal(
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"Unexpected MESSAGE_OK_JSON value '$ret' where null expected");
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}
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return ret as T;
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}
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case MESSAGE_ERR_JSON:
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{
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throw VeilidAPIException.fromJson(value[1] as String);
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}
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default:
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{
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throw VeilidAPIExceptionInternal(
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"Unexpected async return message type: ${value[0]}");
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}
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}
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}).catchError((e) {
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// Wrap all other errors in VeilidAPIExceptionInternal
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throw VeilidAPIExceptionInternal(e.toString());
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}, test: (e) {
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// Pass errors that are already VeilidAPIException through without wrapping
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return e is! VeilidAPIException;
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});
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}
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Future<void> processSingleAsyncVoid(Future<dynamic> future) async {
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return future.then((value) {
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final list = value as List<dynamic>;
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switch (list[0] as int) {
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case MESSAGE_OK:
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{
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if (list[1] != null) {
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throw VeilidAPIExceptionInternal(
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"Unexpected MESSAGE_OK value '${list[1]}' where null expected");
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}
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return;
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}
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case MESSAGE_ERR:
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{
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throw VeilidAPIExceptionInternal("Internal API Error: ${value[1]}");
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}
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case MESSAGE_OK_JSON:
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{
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var ret = jsonDecode(list[1] as String);
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if (ret != null) {
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throw VeilidAPIExceptionInternal(
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"Unexpected MESSAGE_OK_JSON value '$ret' where null expected");
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}
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return;
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}
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case MESSAGE_ERR_JSON:
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{
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throw VeilidAPIException.fromJson(value[1] as String);
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}
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default:
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{
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throw VeilidAPIExceptionInternal(
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"Unexpected async return message type: ${value[0]}");
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}
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}
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}).catchError((e) {
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// Wrap all other errors in VeilidAPIExceptionInternal
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throw VeilidAPIExceptionInternal(e.toString());
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}, test: (e) {
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// Pass errors that are already VeilidAPIException through without wrapping
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return e is! VeilidAPIException;
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});
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}
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// FFI implementation of high level Veilid API
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class VeilidFFI implements Veilid {
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// veilid_core shared library
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final DynamicLibrary _dylib;
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// Shared library functions
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final _free_string_Dart _freeString;
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final _startup_veilid_core_Dart _startupVeilidCore;
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final _get_veilid_state_Dart _getVeilidState;
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final _change_api_log_level_Dart _changeApiLogLevel;
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final _shutdown_veilid_core_Dart _shutdownVeilidCore;
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final _veilid_version_string_Dart _veilidVersionString;
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final _veilid_version_Dart _veilidVersion;
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VeilidFFI(DynamicLibrary dylib)
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: _dylib = dylib,
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_freeString = dylib
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.lookupFunction<_free_string_C, _free_string_Dart>('free_string'),
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_startupVeilidCore = dylib.lookupFunction<_startup_veilid_core_C,
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_startup_veilid_core_Dart>('startup_veilid_core'),
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_getVeilidState =
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dylib.lookupFunction<_get_veilid_state_C, _get_veilid_state_Dart>(
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'get_veilid_state'),
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_changeApiLogLevel = dylib.lookupFunction<_change_api_log_level_C,
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_change_api_log_level_Dart>('change_api_log_level'),
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_shutdownVeilidCore = dylib.lookupFunction<_shutdown_veilid_core_C,
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_shutdown_veilid_core_Dart>('shutdown_veilid_core'),
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_veilidVersionString = dylib.lookupFunction<_veilid_version_string_C,
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_veilid_version_string_Dart>('veilid_version_string'),
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_veilidVersion =
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dylib.lookupFunction<_veilid_version_C, _veilid_version_Dart>(
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'veilid_version') {
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// Get veilid_flutter initializer
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var initializeVeilidFlutter = _dylib.lookupFunction<
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_initializeVeilidFlutter_C,
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_initializeVeilidFlutter_Dart>('initialize_veilid_flutter');
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initializeVeilidFlutter(NativeApi.postCObject);
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}
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@override
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Stream<VeilidUpdate> startupVeilidCore(VeilidConfig config) async* {}
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@override
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Future<VeilidState> getVeilidState() async {
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final recv_port = ReceivePort("shutdown_veilid_core");
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final send_port = recv_port.sendPort;
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_shutdownVeilidCore(send_port.nativePort);
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processSingleAsyncReturn(recv_port.single);
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}
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@override
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Future<void> changeApiLogLevel(VeilidLogLevel logLevel) async {
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var nativeLogLevel = jsonEncode(logLevel).toNativeUtf8();
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final recv_port = ReceivePort("change_api_log_level");
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final send_port = recv_port.sendPort;
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_changeApiLogLevel(send_port.nativePort, nativeLogLevel);
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malloc.free(nativeLogLevel);
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processSingleAsyncVoid(recv_port.single);
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}
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@override
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Future<void> shutdownVeilidCore() async {
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final recv_port = ReceivePort("shutdown_veilid_core");
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final send_port = recv_port.sendPort;
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_shutdownVeilidCore(send_port.nativePort);
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processSingleAsyncVoid(recv_port.single);
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}
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@override
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String veilidVersionString() {
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final versionString = _veilidVersionString();
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String ret = versionString.toDartString();
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_freeString(versionString);
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return ret;
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}
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@override
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VeilidVersion veilidVersion() {
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final version = _veilidVersion();
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return VeilidVersion(
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version.major,
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version.minor,
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version.patch,
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);
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}
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}
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