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125 lines
3.8 KiB
Dart
125 lines
3.8 KiB
Dart
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/// This is copied from Cargokit (which is the official way to use it currently)
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/// Details: https://fzyzcjy.github.io/flutter_rust_bridge/manual/integrate/builtin
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import 'dart:convert';
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:collection/collection.dart';
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import 'package:convert/convert.dart';
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import 'package:crypto/crypto.dart';
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import 'package:path/path.dart' as path;
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class CrateHash {
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/// Computes a hash uniquely identifying crate content. This takes into account
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/// content all all .rs files inside the src directory, as well as Cargo.toml,
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/// Cargo.lock, build.rs and cargokit.yaml.
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///
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/// If [tempStorage] is provided, computed hash is stored in a file in that directory
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/// and reused on subsequent calls if the crate content hasn't changed.
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static String compute(String manifestDir, {String? tempStorage}) {
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return CrateHash._(
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manifestDir: manifestDir,
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tempStorage: tempStorage,
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)._compute();
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}
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CrateHash._({
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required this.manifestDir,
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required this.tempStorage,
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});
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String _compute() {
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final files = getFiles();
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final tempStorage = this.tempStorage;
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if (tempStorage != null) {
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final quickHash = _computeQuickHash(files);
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final quickHashFolder = Directory(path.join(tempStorage, 'crate_hash'));
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quickHashFolder.createSync(recursive: true);
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final quickHashFile = File(path.join(quickHashFolder.path, quickHash));
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if (quickHashFile.existsSync()) {
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return quickHashFile.readAsStringSync();
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}
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final hash = _computeHash(files);
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quickHashFile.writeAsStringSync(hash);
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return hash;
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} else {
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return _computeHash(files);
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}
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}
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/// Computes a quick hash based on files stat (without reading contents). This
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/// is used to cache the real hash, which is slower to compute since it involves
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/// reading every single file.
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String _computeQuickHash(List<File> files) {
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final output = AccumulatorSink<Digest>();
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final input = sha256.startChunkedConversion(output);
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final data = ByteData(8);
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for (final file in files) {
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input.add(utf8.encode(file.path));
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final stat = file.statSync();
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data.setUint64(0, stat.size);
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input.add(data.buffer.asUint8List());
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data.setUint64(0, stat.modified.millisecondsSinceEpoch);
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input.add(data.buffer.asUint8List());
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}
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input.close();
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return base64Url.encode(output.events.single.bytes);
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}
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String _computeHash(List<File> files) {
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final output = AccumulatorSink<Digest>();
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final input = sha256.startChunkedConversion(output);
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void addTextFile(File file) {
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// text Files are hashed by lines in case we're dealing with github checkout
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// that auto-converts line endings.
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final splitter = LineSplitter();
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if (file.existsSync()) {
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final data = file.readAsStringSync();
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final lines = splitter.convert(data);
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for (final line in lines) {
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input.add(utf8.encode(line));
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}
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}
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}
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for (final file in files) {
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addTextFile(file);
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}
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input.close();
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final res = output.events.single;
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// Truncate to 128bits.
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final hash = res.bytes.sublist(0, 16);
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return hex.encode(hash);
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}
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List<File> getFiles() {
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final src = Directory(path.join(manifestDir, 'src'));
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final files = src
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.listSync(recursive: true, followLinks: false)
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.whereType<File>()
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.toList();
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files.sortBy((element) => element.path);
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void addFile(String relative) {
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final file = File(path.join(manifestDir, relative));
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if (file.existsSync()) {
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files.add(file);
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}
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}
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addFile('Cargo.toml');
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addFile('Cargo.lock');
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addFile('build.rs');
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addFile('cargokit.yaml');
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return files;
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}
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final String manifestDir;
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final String? tempStorage;
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}
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