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frq_core.dart · 249 lines · 8.9 KBDart Blame HistoryRaw
The binding is Dart, and it works f7aea3b nandi 17h ago1/// The Nim core, as Dart functions.
2///
3/// This is the whole of what knows `libfrqcore.so` is a native library; see
4/// `nim/README.md` for why the logic is there rather than under `common/`.
5///
6/// **Dart and not ClojureDart, on purpose.** The point of the Nim core is to
7/// have less Clojure, so new code on this side of the boundary is written in
8/// the language the platform speaks. It also sidesteps a real problem:
9/// `lookupFunction` takes two type arguments, and generic interop is the part
10/// of ClojureDart least worth fighting for a file that is pure marshalling.
11///
12/// No `package:ffi` either. That package exists mostly for `Utf8`
13/// conversions, and doing them here against `dart:convert` costs about ten
14/// lines and keeps `pubspec.yaml` unchanged — which matters because every
15/// dependency added here has to work on three targets.
16///
17/// The two rules of the ABI, wrapped so no call site repeats them:
18///
19/// * `frq_init` runs once before anything else. [_lib] does it on the way
20/// out, so holding the handle means it has happened.
21/// * Every string the core returns is **ours to free**, with `frq_free`.
22/// [_takeString] is that, in a `finally` so a throw between the read and
23/// the free does not leak. Nim's allocator is not Dart's, so calling
24/// `malloc.free` on one of these pointers is undefined rather than merely
25/// untidy.
26library;
27
28import 'dart:convert';
29import 'dart:ffi';
30import 'dart:io';
31
32// ---------------------------------------------------------------- the ABI
33
34typedef _InitNative = Void Function();
35typedef _InitDart = void Function();
36
37typedef _FreeNative = Void Function(Pointer<Uint8>);
38typedef _FreeDart = void Function(Pointer<Uint8>);
39
40typedef _VersionNative = Pointer<Uint8> Function();
41typedef _VersionDart = Pointer<Uint8> Function();
42
43typedef _Str1Native = Pointer<Uint8> Function(Pointer<Uint8>);
44typedef _Str1Dart = Pointer<Uint8> Function(Pointer<Uint8>);
45
46typedef _Str2Native = Pointer<Uint8> Function(Pointer<Uint8>, Pointer<Uint8>);
47typedef _Str2Dart = Pointer<Uint8> Function(Pointer<Uint8>, Pointer<Uint8>);
48
Nim owns the screen, Dart owns the pixels 43a02c2 nandi 16h ago49typedef _Str0Native = Pointer<Uint8> Function();
50typedef _Str0Dart = Pointer<Uint8> Function();
51
52typedef _VoidNative = Void Function();
53typedef _VoidDart = void Function();
54
The binding is Dart, and it works f7aea3b nandi 17h ago55/// Where to look for the library, in order.
56///
57/// Android resolves a bare soname out of the APK's `lib/<abi>/`. A desktop
58/// build has no such rule, so the bare name is tried first (it works when the
59/// object sits beside the executable or on the loader path) and then the
60/// development path `just nim-lib` writes to. Named explicitly rather than by
61/// exporting `LD_LIBRARY_PATH` from a launcher, because a variable set in a
62/// wrapper script is a thing that works until someone starts the binary
63/// another way.
64DynamicLibrary _open() {
65 if (Platform.isAndroid) return DynamicLibrary.open('libfrqcore.so');
66 // The development paths are relative to whichever directory the process
67 // started in: `dart test` runs from `dart/frq_core`, a built desktop bundle
68 // from the repo root. All of them are tried rather than guessing which
69 // invocation this is, because the failure mode is a StateError at first use
70 // rather than anything a type checker would have caught.
71 for (final p in [
72 'libfrqcore.so',
73 'build/nim/libfrqcore.so',
Nim owns the screen, Dart owns the pixels 43a02c2 nandi 16h ago74 '../build/nim/libfrqcore.so', // `flutter test`, from flutter/
75 '../../build/nim/libfrqcore.so', // `dart test`, from dart/frq_core/
The binding is Dart, and it works f7aea3b nandi 17h ago76 ]) {
77 try {
78 return DynamicLibrary.open(p);
79 } on ArgumentError {
80 continue;
81 }
82 }
83 throw StateError(
84 'libfrqcore.so not found — build it with `just nim-lib`, or ship it '
85 'beside the executable');
86}
87
88final DynamicLibrary _lib = () {
89 final lib = _open();
90 lib.lookupFunction<_InitNative, _InitDart>('frq_init')();
91 return lib;
92}();
93
94final _free = _lib.lookupFunction<_FreeNative, _FreeDart>('frq_free');
95
96/// The bytes at [p] as a string, with [p] freed afterwards. Null in, null out.
97String? _takeString(Pointer<Uint8> p) {
98 if (p == nullptr) return null;
99 try {
100 // Walk to the NUL rather than asking for a length the ABI does not carry.
101 var len = 0;
102 while (p[len] != 0) {
103 len++;
104 }
105 return utf8.decode(p.asTypedList(len));
106 } finally {
107 _free(p);
108 }
109}
110
111/// [s] as a NUL-terminated C string that the CALLER must free with [_freeArg].
112///
113/// Allocated with `malloc` from Dart's side, so it is freed from Dart's side —
114/// the mirror of the rule for what comes back. The core never takes ownership
115/// of an argument.
116Pointer<Uint8> _toC(String s) {
117 final bytes = utf8.encode(s);
118 final p = _malloc(bytes.length + 1).cast<Uint8>();
119 for (var i = 0; i < bytes.length; i++) {
120 p[i] = bytes[i];
121 }
122 p[bytes.length] = 0;
123 return p;
124}
125
126// malloc/free out of libc rather than package:ffi's allocator, for the same
127// reason the rest of this file avoids that package: one less dependency to
128// carry to three targets, for two symbols that are always there.
129final DynamicLibrary _libc =
130 Platform.isWindows ? DynamicLibrary.open('msvcrt.dll') : DynamicLibrary.process();
131final _malloc = _libc
132 .lookupFunction<Pointer<Void> Function(IntPtr), Pointer<Void> Function(int)>('malloc');
133final _freeArg =
134 _libc.lookupFunction<Void Function(Pointer<Uint8>), void Function(Pointer<Uint8>)>('free');
135
136/// Call a one-string-in, one-string-out entry point.
137String? _call1(String symbol, String arg) {
138 final f = _lib.lookupFunction<_Str1Native, _Str1Dart>(symbol);
139 final a = _toC(arg);
140 try {
141 return _takeString(f(a));
142 } finally {
143 _freeArg(a);
144 }
145}
146
147// ------------------------------------------------------------------ public
148
149/// The core's version, for a caller that wants to check the library it found
150/// is the one it was built against. Static storage on the Nim side: the one
151/// return value that is NOT freed.
152String get version {
153 final p = _lib.lookupFunction<_VersionNative, _VersionDart>('frq_version')();
154 var len = 0;
155 while (p[len] != 0) {
156 len++;
157 }
158 return utf8.decode(p.asTypedList(len));
159}
160
161/// An IRC line, taken apart: `{raw, tags, account, prefix, command, params}`.
162///
163/// `tags`, `account` and `prefix` are null where the line carried none, which
164/// is the distinction `frq.irc.parse` draws with nil and every caller depends
165/// on — a PRIVMSG from a server with no prefix is not the same line as one
166/// from a nick.
167Map<String, dynamic> parseLine(String line) {
168 final json = _call1('frq_irc_parse_line', line);
169 return jsonDecode(json ?? 'null') as Map<String, dynamic>;
170}
171
172/// One IRCv3 tag's value, unescaped — null where the tag is absent OR empty,
173/// which IRCv3 says are the same thing.
174String? tagValue(String tags, String key) {
175 final f = _lib.lookupFunction<_Str2Native, _Str2Dart>('frq_irc_tag_value');
176 final a = _toC(tags);
177 final b = _toC(key);
178 try {
179 return _takeString(f(a, b));
180 } finally {
181 _freeArg(a);
182 _freeArg(b);
183 }
184}
185
186String unescapeTag(String v) => _call1('frq_irc_unescape_tag', v) ?? '';
187
188String escapeTagValue(String v) => _call1('frq_irc_escape_tag_value', v) ?? '';
189
190/// The nick half of a `nick!user@host` prefix.
191String nickOf(String prefix) => _call1('frq_irc_nick_of', prefix) ?? '';
Nim owns the screen, Dart owns the pixels 43a02c2 nandi 16h ago192
193
Nim under the existing UI, not instead of it 56551a8 nandi 16h ago194/// Log through the Nim core's trace facility, so `FRQ_TRACE=1` gives one
195/// interleaved story rather than two half-ones in different places.
196void trace(String topic, String msg) {
197 final f = _lib.lookupFunction<_Str2Native, _Str2Dart>('frq_trace');
198 final a = _toC(topic);
199 final b = _toC(msg);
200 try {
201 f(a, b);
202 } finally {
203 _freeArg(a);
204 _freeArg(b);
205 }
206}
207
208// --------------------------------------------------------------- transport
209//
210// `frq.net`'s three operations, with a Nim socket behind them. This is the
211// wiring that leaves the existing ClojureDart screens, cells and actions
212// alone: only the transport underneath them is Nim.
213
214typedef _ConnOpenNative = Void Function(Pointer<Uint8>, Int32, Int32);
215typedef _ConnOpenDart = void Function(Pointer<Uint8>, int, int);
216
217/// Dial. Non-blocking: the socket runs on a Nim thread and progress arrives
218/// through [connEvent].
219void connOpen(String host, int port, {bool tls = true}) {
220 final f = _lib.lookupFunction<_ConnOpenNative, _ConnOpenDart>('frq_conn_open');
221 final a = _toC(host);
222 try {
223 f(a, port, tls ? 1 : 0);
224 } finally {
225 _freeArg(a);
226 }
227}
228
229/// Queue a line. The transport adds the CRLF.
230void connSend(String line) {
231 final f = _lib.lookupFunction<_Str1Native, _Str1Dart>('frq_conn_send');
232 final a = _toC(line);
233 try {
234 f(a);
235 } finally {
236 _freeArg(a);
237 }
238}
239
240void connClose() =>
241 _lib.lookupFunction<_VoidNative, _VoidDart>('frq_conn_close')();
242
243/// The next line, or null when none is waiting. Never blocks.
244String? connRecv() => _takeString(
245 _lib.lookupFunction<_Str0Native, _Str0Dart>('frq_conn_recv')());
246
247/// The next transport event — `open`, `close: …`, `error: …` — or null.
248String? connEvent() => _takeString(
249 _lib.lookupFunction<_Str0Native, _Str0Dart>('frq_conn_event')());