[flutter_svg] Fix SvgNetworkLoader not closing internal http client (#8126)

closes flutter/flutter#158928

Ensures that if a Client is created in `prepareMessage` it is closed after getting the resource.

Author: derdilla

third_party/packages/flutter_svg/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.0.15
+
+* Fixes `SvgNetworkLoader` not closing internally created http clients.
+
 ## 2.0.14
 
 * Makes the package WASM compatible.

third_party/packages/flutter_svg/lib/src/loaders.dart

@@ -438,7 +438,12 @@ class SvgNetworkLoader extends SvgLoader<Uint8List> {
   @override
   Future<Uint8List?> prepareMessage(BuildContext? context) async {
     final http.Client client = _httpClient ?? http.Client();
-    return (await client.get(Uri.parse(url), headers: headers)).bodyBytes;
+    final http.Response response =
+        await client.get(Uri.parse(url), headers: headers);
+    if (_httpClient == null) {
+      client.close();
+    }
+    return response.bodyBytes;
   }
 
   @override

third_party/packages/flutter_svg/pubspec.yaml

@@ -2,7 +2,7 @@ name: flutter_svg
 description: An SVG rendering and widget library for Flutter, which allows painting and displaying Scalable Vector Graphics 1.1 files.
 repository: https://github.com/flutter/packages/tree/main/third_party/packages/flutter_svg
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+flutter_svg%22
-version: 2.0.14
+version: 2.0.15
 
 environment:
   sdk: ^3.4.0

third_party/packages/flutter_svg/test/loaders_test.dart

@@ -2,6 +2,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
 
 void main() {
   setUp(() {
@@ -57,6 +58,36 @@ void main() {
     expect((await loader.prepareMessage(null))!.lengthInBytes, 0);
     expect((await packageLoader.prepareMessage(null))!.lengthInBytes, 1);
   });
+
+  test('SvgNetworkLoader closes internal client', () async {
+    final List<VerifyCloseClient> createdClients = <VerifyCloseClient>[];
+
+    await http.runWithClient(() async {
+      const SvgNetworkLoader loader = SvgNetworkLoader('');
+
+      expect(createdClients, isEmpty);
+      await loader.prepareMessage(null);
+
+      expect(createdClients, hasLength(1));
+      expect(createdClients[0].closeCalled, isTrue);
+    }, () {
+      final VerifyCloseClient client = VerifyCloseClient();
+      createdClients.add(client);
+      return client;
+    });
+  });
+
+  test("SvgNetworkLoader doesn't close passed client", () async {
+    final VerifyCloseClient client = VerifyCloseClient();
+    final SvgNetworkLoader loader = SvgNetworkLoader(
+      '',
+      httpClient: client as http.Client,
+    );
+
+    expect(client.closeCalled, isFalse);
+    await loader.prepareMessage(null);
+    expect(client.closeCalled, isFalse);
+  });
 }
 
 class TestBundle extends Fake implements AssetBundle {
@@ -96,3 +127,18 @@ class _TestColorMapper extends ColorMapper {
     return color;
   }
 }
+
+class VerifyCloseClient extends Fake implements http.Client {
+  bool closeCalled = false;
+
+  @override
+  Future<http.Response> get(Uri url, {Map<String, String>? headers}) async {
+    return http.Response('', 200);
+  }
+
+  @override
+  void close() {
+    assert(!closeCalled);
+    closeCalled = true;
+  }
+}