更新0.7.4，优化上传域名熔断策略，当全部域名都被冻结后，立即随机选择一个域名返回，不抛出异常

Author: zhangzqs

base/lib/src/storage/config/config.dart

@@ -8,6 +8,7 @@ import 'package:platform_info/platform_info.dart';
 import 'package:qiniu_sdk_base/src/storage/storage.dart';
 import 'package:qiniu_sdk_base/src/util/cache_provider_base.dart'
     as cache_provider;
+import 'package:qiniu_sdk_base/src/util/random.dart';
 import 'package:singleflight/singleflight.dart' as singleflight;
 import 'package:path/path.dart' show join;
 

base/lib/src/storage/config/host.dart

@@ -112,7 +112,8 @@ class DefaultHostProvider extends HostFreezer {
         return '$protocol://${availableDomain.value}';
       }
     }
-    _throwNoAvailableHostError();
+    // 全都不可用了，随机选择一个域名返回
+    return '$protocol://${upDomains.mustGetRandomElement()}';
   }
 }
 
@@ -201,7 +202,15 @@ class DefaultHostProviderV2 extends HostFreezer {
         return unfrozenDomain;
       }
     }
-    _throwNoAvailableHostError();
+
+    print("全都不可用了，随机选择一个域名返回");
+    // 全都不可用了，随机选择一个域名返回
+    return regions
+        .mustGetRandomElement()
+        .up
+        .map((domain) => _makeHost(domain, useHttps: _useHttps))
+        .toList()
+        .mustGetRandomElement();
   }
 
   Future<BucketRegionsQuery> get query => _getQuery();
@@ -276,13 +285,6 @@ void _checkResponse(Response response) {
   }
 }
 
-Never _throwNoAvailableHostError() {
-  throw StorageError(
-    type: StorageErrorType.NO_AVAILABLE_HOST,
-    message: '没有可用的上传域名',
-  );
-}
-
 Never _throwNoAvailableRegionError() {
   throw StorageError(
     type: StorageErrorType.NO_AVAILABLE_REGION,

base/lib/src/util/random.dart

@@ -0,0 +1,9 @@
+import 'dart:math';
+
+final random = Random();
+
+extension ListRandomSelect<T> on List<T> {
+  T mustGetRandomElement() {
+    return elementAt(random.nextInt(length));
+  }
+}

base/lib/src/version.dart

@@ -1,3 +1,3 @@
 import 'package:version/version.dart';
 
-final Version currentVersion = Version.parse('0.7.3');
+final Version currentVersion = Version.parse('0.7.4');

base/pubspec.yaml

@@ -1,5 +1,5 @@
 name: qiniu_sdk_base
-version: 0.7.3
+version: 0.7.4
 homepage: https://github.com/qiniu/dart-sdk
 description: The sdk basic of Qiniu products
 

flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.7.4
+
+* 优化上传域名熔断策略，当全部域名都被冻结后，立即随机选择一个域名返回，不抛出异常
+
 ## 0.7.3
 
 * 优化表单上传进度更新粒度

flutter/lib/src/version.dart

@@ -1,4 +1,4 @@
 import 'package:version/version.dart';
 
 /// 当前SDK版本号
-final Version currentVersion = Version.parse('0.7.3');
+final Version currentVersion = Version.parse('0.7.4');

flutter/pubspec.yaml

@@ -1,6 +1,6 @@
 name: qiniu_flutter_sdk
 description: Qiniu Flutter sdk
-version: 0.7.3
+version: 0.7.4
 homepage: https://github.com/qiniu/dart-sdk/tree/master/flutter
 
 environment:
@@ -11,7 +11,7 @@ dependencies:
   device_info_plus: ^11.3.0
   flutter:
     sdk: flutter
-  qiniu_sdk_base: ^0.7.3
+  qiniu_sdk_base: ^0.7.4
   version: ^3.0.2
 
 dev_dependencies: