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Add assets digests handler #1709

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Aug 7, 2018
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22 changes: 22 additions & 0 deletions build_runner/lib/src/server/server.dart
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ import 'path_to_asset_id.dart';

const _performancePath = r'$perf';
final _graphPath = r'$graph';
final _assetsDigestPath = r'$assetDigests';
final _buildUpdatesProtocol = r'$livereload';
final _buildUpdatesMessage = 'update';
final entrypointExtensionMarker = '/* ENTRYPOINT_EXTENTION_MARKER */';
Expand Down Expand Up @@ -79,6 +80,9 @@ class ServeHandler implements BuildState {
if (request.url.path == _performancePath) {
return _performanceHandler(request);
}
if (request.url.path == _assetsDigestPath) {
return _assetsDigestHandler(request, rootDir);
}
if (request.url.path.startsWith(_graphPath)) {
var graphHandler = await _assetGraphHandler;
return await graphHandler.handle(
Expand Down Expand Up @@ -112,6 +116,24 @@ class ServeHandler implements BuildState {
headers: {HttpHeaders.contentTypeHeader: 'text/html'});
}

Future<shelf.Response> _assetsDigestHandler(
shelf.Request request, String rootDir) async {
var assertPathList = jsonDecode(await request.readAsString()) as List;
var rootPackage = _state.packageGraph.root.name;
var results = <String, String>{};
for (String path in assertPathList) {
try {
var assetId = pathToAssetId(rootPackage, rootDir, p.url.split(path));
var digest = await _state.reader.digest(assetId);
results[path] = digest.toString();
} on AssetNotFoundException {
results.remove(path);
}
}
return new shelf.Response.ok(jsonEncode(results),
headers: {HttpHeaders.contentTypeHeader: 'application/json'});
}

void _warnForEmptyDirectory(String rootDir) {
if (!_state.assetGraph
.packageNodes(_rootPackage)
Expand Down
18 changes: 18 additions & 0 deletions build_runner/test/server/serve_handler_test.dart
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';
import 'dart:convert';
import 'dart:io';

import 'package:logging/logging.dart';
Expand Down Expand Up @@ -165,6 +166,23 @@ void main() {
});
});

test('serve asset digests', () async {
_addSource('a|web/index.html', 'content1');
_addSource('a|lib/some.dart.js', 'content2');
_addSource('a|lib/another.dart.js', 'content3');
var response = await serveHandler.handlerFor('web')(new Request(
'GET', Uri.parse('http://server.com/\$assetDigests'),
body: jsonEncode([
'index.html',
'packages/a/some.dart.js',
'packages/a/absent.dart.js'
])));
expect(jsonDecode(await response.readAsString()), {
'index.html': '7e55db001d319a94b0b713529a756623',
'packages/a/some.dart.js': 'eea670f4ac941df71a3b5f268ebe3eac',
});
});

group('build updates', () {
test('injects client code if enabled', () async {
_addSource('a|web/some.js', entrypointExtensionMarker + '\nalert(1)');
Expand Down