366 lines
12 KiB
Dart
366 lines
12 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 _DartPostCObject
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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 _FreeStringC = Void Function(Pointer<Utf8>);
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typedef _FreeStringDart = void Function(Pointer<Utf8>);
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// fn initialize_veilid_flutter(dart_post_c_object_ptr: ffi::DartPostCObjectFnType)
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typedef _InitializeVeilidFlutterC = Void Function(Pointer<_DartPostCObject>);
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typedef _InitializeVeilidFlutterDart = void Function(Pointer<_DartPostCObject>);
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// fn configure_veilid_platform(platform_config: FfiStr)
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typedef _ConfigureVeilidPlatformC = Void Function(Pointer<Utf8>);
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typedef _ConfigureVeilidPlatformDart = void Function(Pointer<Utf8>);
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// fn change_log_level(layer: FfiStr, log_level: FfiStr)
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typedef _ChangeLogLevelC = Void Function(Pointer<Utf8>, Pointer<Utf8>);
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typedef _ChangeLogLevelDart = void Function(Pointer<Utf8>, Pointer<Utf8>);
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// fn startup_veilid_core(port: i64, config: FfiStr)
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typedef _StartupVeilidCoreC = Void Function(Int64, Pointer<Utf8>);
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typedef _StartupVeilidCoreDart = void Function(int, Pointer<Utf8>);
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// fn get_veilid_state(port: i64)
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typedef _GetVeilidStateC = Void Function(Int64);
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typedef _GetVeilidStateDart = void Function(int);
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// fn debug(port: i64, log_level: FfiStr)
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typedef _DebugC = Void Function(Int64, Pointer<Utf8>);
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typedef _DebugDart = void Function(int, Pointer<Utf8>);
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// fn shutdown_veilid_core(port: i64)
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typedef _ShutdownVeilidCoreC = Void Function(Int64);
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typedef _ShutdownVeilidCoreDart = void Function(int);
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// fn veilid_version_string() -> *mut c_char
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typedef _VeilidVersionStringC = Pointer<Utf8> Function();
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typedef _VeilidVersionStringDart = 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 _VeilidVersionC = VeilidVersionFFI Function();
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typedef _VeilidVersionDart = VeilidVersionFFI Function();
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// Async message types
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const int messageOk = 0;
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const int messageErr = 1;
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const int messageOkJson = 2;
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const int messageErrJson = 3;
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const int messageStreamItem = 4;
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const int messageStreamItemJson = 5;
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const int messageStreamAbort = 6;
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const int messageStreamAbortJson = 7;
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const int messageStreamClose = 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> processFuturePlain<T>(Future<dynamic> future) {
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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 messageOk:
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{
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if (list[1] == null) {
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throw VeilidAPIExceptionInternal("Null MESSAGE_OK value");
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}
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return list[1] as T;
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}
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case messageErr:
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{
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throw VeilidAPIExceptionInternal("Internal API Error: ${list[1]}");
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}
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case messageErrJson:
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{
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throw VeilidAPIException.fromJson(jsonDecode(list[1]));
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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: ${list[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<T> processFutureJson<T>(
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T Function(Map<String, dynamic>) jsonConstructor, Future<dynamic> future) {
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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 messageErr:
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{
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throw VeilidAPIExceptionInternal("Internal API Error: ${list[1]}");
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}
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case messageOkJson:
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{
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if (list[1] == null) {
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throw VeilidAPIExceptionInternal("Null MESSAGE_OK_JSON value");
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}
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var ret = jsonDecode(list[1] as String);
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return jsonConstructor(ret);
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}
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case messageErrJson:
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{
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throw VeilidAPIException.fromJson(jsonDecode(list[1]));
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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: ${list[0]}");
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}
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}
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}).catchError((e) {
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// Wrap all other errors in VeilidAPIExceptionInternal
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throw VeilidAPIExceptionInternal(e.toString());
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}, test: (e) {
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// Pass errors that are already VeilidAPIException through without wrapping
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return e is! VeilidAPIException;
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});
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}
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Future<void> processFutureVoid(Future<dynamic> future) {
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return future.then((value) {
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final list = value as List<dynamic>;
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switch (list[0] as int) {
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case messageOk:
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{
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if (list[1] != null) {
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throw VeilidAPIExceptionInternal(
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"Unexpected MESSAGE_OK value '${list[1]}' where null expected");
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}
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return;
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}
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case messageErr:
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{
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throw VeilidAPIExceptionInternal("Internal API Error: ${list[1]}");
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}
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case messageOkJson:
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{
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var ret = jsonDecode(list[1] as String);
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if (ret != null) {
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throw VeilidAPIExceptionInternal(
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"Unexpected MESSAGE_OK_JSON value '$ret' where null expected");
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}
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return;
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}
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case messageErrJson:
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{
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throw VeilidAPIException.fromJson(jsonDecode(list[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: ${list[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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Stream<T> processStreamJson<T>(
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T Function(Map<String, dynamic>) jsonConstructor, ReceivePort port) async* {
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try {
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await for (var value in port) {
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final list = value as List<dynamic>;
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switch (list[0] as int) {
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case messageStreamItemJson:
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{
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if (list[1] == null) {
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throw VeilidAPIExceptionInternal(
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"Null MESSAGE_STREAM_ITEM_JSON value");
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}
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var ret = jsonDecode(list[1] as String);
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yield jsonConstructor(ret);
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break;
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}
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case messageStreamAbort:
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{
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port.close();
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throw VeilidAPIExceptionInternal("Internal API Error: ${list[1]}");
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}
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case messageStreamAbortJson:
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{
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port.close();
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throw VeilidAPIException.fromJson(jsonDecode(list[1]));
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}
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case messageStreamClose:
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{
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port.close();
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break;
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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: ${list[0]}");
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}
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}
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}
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} catch (e, s) {
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// Wrap all other errors in VeilidAPIExceptionInternal
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throw VeilidAPIExceptionInternal(
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"${e.toString()}\nStack Trace:\n${s.toString()}");
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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 _FreeStringDart _freeString;
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final _ConfigureVeilidPlatformDart _configureVeilidPlatform;
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final _ChangeLogLevelDart _changeLogLevel;
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final _StartupVeilidCoreDart _startupVeilidCore;
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final _GetVeilidStateDart _getVeilidState;
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final _ShutdownVeilidCoreDart _shutdownVeilidCore;
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final _DebugDart _debug;
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final _VeilidVersionStringDart _veilidVersionString;
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final _VeilidVersionDart _veilidVersion;
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VeilidFFI(DynamicLibrary dylib)
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: _dylib = dylib,
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_freeString =
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dylib.lookupFunction<_FreeStringC, _FreeStringDart>('free_string'),
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_configureVeilidPlatform = dylib.lookupFunction<
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_ConfigureVeilidPlatformC,
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_ConfigureVeilidPlatformDart>('configure_veilid_platform'),
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_changeLogLevel =
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dylib.lookupFunction<_ChangeLogLevelC, _ChangeLogLevelDart>(
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'change_log_level'),
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_startupVeilidCore =
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dylib.lookupFunction<_StartupVeilidCoreC, _StartupVeilidCoreDart>(
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'startup_veilid_core'),
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_getVeilidState =
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dylib.lookupFunction<_GetVeilidStateC, _GetVeilidStateDart>(
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'get_veilid_state'),
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_shutdownVeilidCore =
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dylib.lookupFunction<_ShutdownVeilidCoreC, _ShutdownVeilidCoreDart>(
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'shutdown_veilid_core'),
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_debug = dylib.lookupFunction<_DebugC, _DebugDart>('debug'),
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_veilidVersionString = dylib.lookupFunction<_VeilidVersionStringC,
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_VeilidVersionStringDart>('veilid_version_string'),
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_veilidVersion =
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dylib.lookupFunction<_VeilidVersionC, _VeilidVersionDart>(
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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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_InitializeVeilidFlutterC,
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_InitializeVeilidFlutterDart>('initialize_veilid_flutter');
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initializeVeilidFlutter(NativeApi.postCObject);
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}
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@override
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void configureVeilidPlatform(Map<String, dynamic> platformConfigJson) {
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var nativePlatformConfig =
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jsonEncode(platformConfigJson, toEncodable: veilidApiToEncodable)
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.toNativeUtf8();
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_configureVeilidPlatform(nativePlatformConfig);
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malloc.free(nativePlatformConfig);
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}
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@override
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void changeLogLevel(String layer, VeilidConfigLogLevel logLevel) {
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var nativeLogLevel =
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jsonEncode(logLevel.json, toEncodable: veilidApiToEncodable)
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.toNativeUtf8();
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var nativeLayer = layer.toNativeUtf8();
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_changeLogLevel(nativeLayer, nativeLogLevel);
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malloc.free(nativeLayer);
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malloc.free(nativeLogLevel);
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}
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@override
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Stream<VeilidUpdate> startupVeilidCore(VeilidConfig config) {
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var nativeConfig =
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jsonEncode(config.json, toEncodable: veilidApiToEncodable)
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.toNativeUtf8();
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final recvPort = ReceivePort("startup_veilid_core");
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final sendPort = recvPort.sendPort;
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_startupVeilidCore(sendPort.nativePort, nativeConfig);
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malloc.free(nativeConfig);
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return processStreamJson(VeilidUpdate.fromJson, recvPort);
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}
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@override
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Future<VeilidState> getVeilidState() async {
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final recvPort = ReceivePort("get_veilid_state");
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final sendPort = recvPort.sendPort;
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_getVeilidState(sendPort.nativePort);
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return processFutureJson(VeilidState.fromJson, recvPort.first);
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}
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@override
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Future<void> shutdownVeilidCore() async {
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final recvPort = ReceivePort("shutdown_veilid_core");
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final sendPort = recvPort.sendPort;
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_shutdownVeilidCore(sendPort.nativePort);
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return processFutureVoid(recvPort.first);
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}
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@override
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Future<String> debug(String command) async {
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var nativeCommand = command.toNativeUtf8();
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final recvPort = ReceivePort("debug");
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final sendPort = recvPort.sendPort;
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_debug(sendPort.nativePort, nativeCommand);
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return processFuturePlain(recvPort.first);
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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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