feat:优化代码

DNSPod · Aug 11, 2022 · 8beac8d · 8beac8d
1 parent a4f8c80
commit 8beac8d
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Showing 6 changed files with 45 additions and 75 deletions.
diff --git a/MSDKDns.xcodeproj/project.pbxproj b/MSDKDns.xcodeproj/project.pbxproj
@@ -38,12 +38,12 @@
 		54EA82232760890B005F68A9 /* AttaReport.m in Sources */ = {isa = PBXBuildFile; fileRef = 54EA82212760890B005F68A9 /* AttaReport.m */; };
 		54EA822427608A55005F68A9 /* AttaReport.h in Headers */ = {isa = PBXBuildFile; fileRef = 54EA82202760890B005F68A9 /* AttaReport.h */; };
 		54EA822527608A58005F68A9 /* AttaReport.m in Sources */ = {isa = PBXBuildFile; fileRef = 54EA82212760890B005F68A9 /* AttaReport.m */; };
-		5FE4BAB4289A4E4700C7A944 /* HttpdnsSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5FE4BAB1289A4E4700C7A944 /* HttpdnsSpeedTester.h */; };
-		5FE4BAB5289A4E4700C7A944 /* HttpdnsSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5FE4BAB1289A4E4700C7A944 /* HttpdnsSpeedTester.h */; };
-		5FE4BAB6289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5FE4BAB2289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h */; };
-		5FE4BAB7289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5FE4BAB2289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h */; };
-		5FE4BAB8289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m in Sources */ = {isa = PBXBuildFile; fileRef = 5FE4BAB3289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m */; };
-		5FE4BAB9289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m in Sources */ = {isa = PBXBuildFile; fileRef = 5FE4BAB3289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m */; };
+		5F5DAF4E28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5F5DAF4B28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h */; };
+		5F5DAF4F28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5F5DAF4B28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h */; };
+		5F5DAF5028A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m in Sources */ = {isa = PBXBuildFile; fileRef = 5F5DAF4C28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m */; };
+		5F5DAF5128A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m in Sources */ = {isa = PBXBuildFile; fileRef = 5F5DAF4C28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m */; };
+		5F5DAF5228A525E300BF5B79 /* MSDKDnsSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5F5DAF4D28A525E300BF5B79 /* MSDKDnsSpeedTester.h */; };
+		5F5DAF5328A525E300BF5B79 /* MSDKDnsSpeedTester.h in Headers */ = {isa = PBXBuildFile; fileRef = 5F5DAF4D28A525E300BF5B79 /* MSDKDnsSpeedTester.h */; };
 		C8EBE7D3256664C500BEFEEC /* aes.h in Headers */ = {isa = PBXBuildFile; fileRef = C8EBE7D1256664C400BEFEEC /* aes.h */; };
 		C8EBE7D4256664C500BEFEEC /* aes.mm in Sources */ = {isa = PBXBuildFile; fileRef = C8EBE7D2256664C500BEFEEC /* aes.mm */; };
 		C8EBE7F4256668A300BEFEEC /* libc++.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = C8EBE7DA2566675800BEFEEC /* libc++.tbd */; };
@@ -110,9 +110,9 @@
 		54EA81F1275478D1005F68A9 /* httpdnsIps.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = httpdnsIps.h; sourceTree = "<group>"; };
 		54EA82202760890B005F68A9 /* AttaReport.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AttaReport.h; sourceTree = "<group>"; };
 		54EA82212760890B005F68A9 /* AttaReport.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = AttaReport.m; sourceTree = "<group>"; };
-		5FE4BAB1289A4E4700C7A944 /* HttpdnsSpeedTester.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = HttpdnsSpeedTester.h; sourceTree = "<group>"; };
-		5FE4BAB2289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = HttpdnsTCPSpeedTester.h; sourceTree = "<group>"; };
-		5FE4BAB3289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = HttpdnsTCPSpeedTester.m; sourceTree = "<group>"; };
+		5F5DAF4B28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MSDKDnsTCPSpeedTester.h; sourceTree = "<group>"; };
+		5F5DAF4C28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = MSDKDnsTCPSpeedTester.m; sourceTree = "<group>"; };
+		5F5DAF4D28A525E300BF5B79 /* MSDKDnsSpeedTester.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MSDKDnsSpeedTester.h; sourceTree = "<group>"; };
 		C8EBE7D1256664C400BEFEEC /* aes.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = aes.h; sourceTree = "<group>"; };
 		C8EBE7D2256664C500BEFEEC /* aes.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = aes.mm; sourceTree = "<group>"; };
 		C8EBE7DA2566675800BEFEEC /* libc++.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = "libc++.tbd"; path = "Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/lib/libc++.tbd"; sourceTree = DEVELOPER_DIR; };
@@ -174,9 +174,9 @@
 				4497F8BC1B46306200D51391 /* MSDKDnsPrivate.h */,
 				504F54381ECAF89F001BD7A9 /* MSDKDnsHttpMessageTools.h */,
 				504F54391ECAF89F001BD7A9 /* MSDKDnsHttpMessageTools.m */,
-				5FE4BAB1289A4E4700C7A944 /* HttpdnsSpeedTester.h */,
-				5FE4BAB2289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h */,
-				5FE4BAB3289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m */,
+				5F5DAF4D28A525E300BF5B79 /* MSDKDnsSpeedTester.h */,
+				5F5DAF4B28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h */,
+				5F5DAF4C28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m */,
 				C8EBE7D1256664C400BEFEEC /* aes.h */,
 				C8EBE7D2256664C500BEFEEC /* aes.mm */,
 				54EA821F2760890B005F68A9 /* Reporter */,
@@ -272,18 +272,18 @@
 				C8EBE7D3256664C500BEFEEC /* aes.h in Headers */,
 				445B36631CBD095C00BD4345 /* MSDKDnsManager.h in Headers */,
 				4497F8B81B4628F000D51391 /* MSDKDnsLog.h in Headers */,
-				5FE4BAB4289A4E4700C7A944 /* HttpdnsSpeedTester.h in Headers */,
 				4455D15E1B3A5B90005BF126 /* MSDKDns.h in Headers */,
 				448EE4E61B329899004A2131 /* LocalDnsResolver.h in Headers */,
 				DD5935581DDC56B200BF9348 /* HttpsDnsResolver.h in Headers */,
+				5F5DAF4E28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h in Headers */,
 				448EE4E81B329899004A2131 /* MSDKDnsResolver.h in Headers */,
 				54EA82222760890B005F68A9 /* AttaReport.h in Headers */,
+				5F5DAF5228A525E300BF5B79 /* MSDKDnsSpeedTester.h in Headers */,
 				44BFE2371CA58C3A00D7FE87 /* MSDKDnsInfoTool.h in Headers */,
 				502422EC2140073F0094403C /* MSDKDnsParamsManager.h in Headers */,
 				4497F8BD1B46306200D51391 /* MSDKDnsPrivate.h in Headers */,
 				444044F91B3133A30010F5D5 /* MSDKDnsService.h in Headers */,
 				501001F0215E1F1D003288A5 /* msdkdns_local_ip_stack.h in Headers */,
-				5FE4BAB6289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -297,18 +297,18 @@
 				2FBE52E825E77AFE0012A0DF /* aes.h in Headers */,
 				DD43F4A9231CC36D0000A89F /* MSDKDnsManager.h in Headers */,
 				DD43F4AA231CC36D0000A89F /* MSDKDnsLog.h in Headers */,
-				5FE4BAB5289A4E4700C7A944 /* HttpdnsSpeedTester.h in Headers */,
 				DD43F4AB231CC36D0000A89F /* MSDKDns.h in Headers */,
 				DD43F4AC231CC36D0000A89F /* LocalDnsResolver.h in Headers */,
 				DD43F4AD231CC36D0000A89F /* HttpsDnsResolver.h in Headers */,
+				5F5DAF4F28A525E300BF5B79 /* MSDKDnsTCPSpeedTester.h in Headers */,
 				DD43F4AE231CC36D0000A89F /* MSDKDnsResolver.h in Headers */,
 				54EA822427608A55005F68A9 /* AttaReport.h in Headers */,
+				5F5DAF5328A525E300BF5B79 /* MSDKDnsSpeedTester.h in Headers */,
 				DD43F4AF231CC36D0000A89F /* MSDKDnsInfoTool.h in Headers */,
 				DD43F4B0231CC36D0000A89F /* MSDKDnsParamsManager.h in Headers */,
 				DD43F4B1231CC36D0000A89F /* MSDKDnsPrivate.h in Headers */,
 				DD43F4B2231CC36D0000A89F /* MSDKDnsService.h in Headers */,
 				DD43F4B3231CC36D0000A89F /* msdkdns_local_ip_stack.h in Headers */,
-				5FE4BAB7289A4E4700C7A944 /* HttpdnsTCPSpeedTester.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -499,8 +499,8 @@
 				DD5935561DDC56B200BF9348 /* HttpsDnsResolver.m in Sources */,
 				445B36651CBD095C00BD4345 /* MSDKDnsManager.m in Sources */,
 				444044FA1B3133A30010F5D5 /* MSDKDnsService.m in Sources */,
+				5F5DAF5028A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m in Sources */,
 				501001EE215E1F1D003288A5 /* msdkdns_local_ip_stack.cpp in Sources */,
-				5FE4BAB8289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m in Sources */,
 				44BFE24A1CA59D9800D7FE87 /* MSDKDnsReachability.m in Sources */,
 				C8EBE7D4256664C500BEFEEC /* aes.mm in Sources */,
 				445B366B1CBD1D4700BD4345 /* MSDKDnsNetworkManager.m in Sources */,
@@ -522,8 +522,8 @@
 				DD43F498231CC36D0000A89F /* HttpsDnsResolver.m in Sources */,
 				DD43F499231CC36D0000A89F /* MSDKDnsManager.m in Sources */,
 				DD43F49A231CC36D0000A89F /* MSDKDnsService.m in Sources */,
+				5F5DAF5128A525E300BF5B79 /* MSDKDnsTCPSpeedTester.m in Sources */,
 				2FBE52E925E77B000012A0DF /* aes.mm in Sources */,
-				5FE4BAB9289A4E4700C7A944 /* HttpdnsTCPSpeedTester.m in Sources */,
 				DD43F49B231CC36D0000A89F /* msdkdns_local_ip_stack.cpp in Sources */,
 				DD43F49C231CC36D0000A89F /* MSDKDnsReachability.m in Sources */,
 				DD43F49D231CC36D0000A89F /* MSDKDnsNetworkManager.m in Sources */,

diff --git a/MSDKDns/HttpdnsTCPSpeedTester.h b/MSDKDns/HttpdnsTCPSpeedTester.h
diff --git a/MSDKDns/MSDKDnsService.m b/MSDKDns/MSDKDnsService.m
@@ -10,7 +10,7 @@
 #import "MSDKDnsManager.h"
 #import "MSDKDnsNetworkManager.h"
 #import "MSDKDnsParamsManager.h"
-#import "HttpdnsTCPSpeedTester.h"
+#import "MSDKDnsTCPSpeedTester.h"
 #import "AttaReport.h"
 
 @interface MSDKDnsService () <MSDKDnsResolverDelegate>
@@ -310,15 +310,15 @@ - (void)aysncUpdateIPRankingWithResult:(NSArray *)IPStrings forHost:(NSString *)
 }
 
 - (void)syncUpdateIPRankingWithResult:(NSArray *)IPStrings forHost:(NSString *)host {
-    NSArray *sortedIps = [[HttpdnsTCPSpeedTester new] ipRankingWithIPs:IPStrings host:host];
+    NSArray *sortedIps = [[MSDKDnsTCPSpeedTester new] ipRankingWithIPs:IPStrings host:host];
     [self updateHostManagerDictWithIPs:sortedIps host:host];
 }
 
 - (void)updateHostManagerDictWithIPs:(NSArray *)IPs host:(NSString *)host {
     if(!IPs){
         return;
     }
-    @synchronized(self) {
+    dispatch_async([MSDKDnsInfoTool msdkdns_queue], ^{
         NSDictionary * tempDict = [[[MSDKDnsManager shareInstance] domainDict] objectForKey:host];
         NSMutableDictionary *cacheDict;
 
@@ -351,7 +351,7 @@ - (void)updateHostManagerDictWithIPs:(NSArray *)IPs host:(NSString *)host {
                 [[MSDKDnsManager shareInstance] cacheDomainInfo:cacheDict Domain:host];
             }
         }
-    }
+    });
 }
 
 - (void)resolver:(MSDKDnsResolver *)resolver getDomainError:(NSString *)error retry:(BOOL)retry {

diff --git a/MSDKDns/HttpdnsSpeedTester.h → MSDKDns/MSDKDnsSpeedTester.h b/MSDKDns/HttpdnsSpeedTester.h → MSDKDns/MSDKDnsSpeedTester.h
@@ -2,7 +2,7 @@
  * Copyright (c) Tencent. All rights reserved.
  */
 
-@protocol HttpdnsSpeedTester <NSObject>
+@protocol MSDKDnsSpeedTester <NSObject>
 
 - (float)testSpeedOf:(NSString *)ip port:(int16_t)port;
 - (NSArray<NSString *> *)ipRankingWithIPs:(NSArray<NSString *> *)IPs host:(NSString *)host;

diff --git a/MSDKDns/MSDKDnsTCPSpeedTester.h b/MSDKDns/MSDKDnsTCPSpeedTester.h
@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Tencent. All rights reserved.
+ */
+
+#import <Foundation/Foundation.h>
+#import "MSDKDnsSpeedTester.h"
+
+#define MSDKDns_SOCKET_CONNECT_TIMEOUT 10 //单位秒
+#define MSDKDns_SOCKET_CONNECT_TIMEOUT_RTT 600000//10分钟 单位毫秒
+
+@interface MSDKDnsTCPSpeedTester : NSObject <MSDKDnsSpeedTester>
+
+@end
diff --git a/MSDKDns/HttpdnsTCPSpeedTester.m → MSDKDns/MSDKDnsTCPSpeedTester.m b/MSDKDns/HttpdnsTCPSpeedTester.m → MSDKDns/MSDKDnsTCPSpeedTester.m
@@ -2,7 +2,7 @@
  * Copyright (c) Tencent. All rights reserved.
  */
 
-#import "HttpdnsTCPSpeedTester.h"
+#import "MSDKDnsTCPSpeedTester.h"
 #import "MSDKDnsParamsManager.h"
 #import "MSDKDnsLog.h"
 #import <sys/socket.h>
@@ -15,22 +15,11 @@
 static NSString *const testSpeedKey = @"testSpeed";
 static NSString *const ipKey = @"ip";
 
-@implementation HttpdnsTCPSpeedTester
+@implementation MSDKDnsTCPSpeedTester
 
-/*!
- * 如果用户对域名提供多个端口，取任意一个端口。
- 假设：同一个域名，不同端口到达速度一致。
- 让优选逻辑，尽量少de
- 15s 100s
- 
- - IP池在2个到5个范围内，才进行测速逻辑。
- - 只在ttl未过期内测试。
- - ~~只取内存缓存，与持久化缓存逻辑不产生交集。持久化优先级更高。~~ 无法区分持久化，持久化缓存也可能参与排序。
- - 测速逻辑公开，作为最佳实践。
- - 只在 IPv4 逻辑下测试，IPv6 环境不测。
- - 开启IPv6解析结果时，不测试。
- - 测速逻辑不能增加用户计费请求次数。
- - 预加载也参与IP优选，网络请求成功就异步排序。
+/**
+ *
+ - IP池在2个到9个范围内，才进行测速逻辑。
  -
  */
 - (NSArray<NSString *> *)ipRankingWithIPs:(NSArray<NSString *> *)IPs host:(NSString *)host {
@@ -61,7 +50,7 @@ @implementation HttpdnsTCPSpeedTester
         float testSpeed =  [self testSpeedOf:ip port:port];
         MSDKDNSLOG(@"%@:%hd speed is %f",ip,port,testSpeed);
         if (testSpeed == 0) {
-            testSpeed = HTTPDNS_SOCKET_CONNECT_TIMEOUT_RTT;
+            testSpeed = MSDKDns_SOCKET_CONNECT_TIMEOUT_RTT;
         }
         NSMutableDictionary *IPSpeed = [NSMutableDictionary dictionaryWithCapacity:2];
         [IPSpeed setObject:@(testSpeed) forKey:testSpeedKey];
@@ -88,14 +77,7 @@ @implementation HttpdnsTCPSpeedTester
 }
 
 /**
- *  本测速函数，使用linux socket connect 和select函数实现的。 基于以下原理
- *  1. 即使套接口是非阻塞的。如果连接的服务器在同一台主机上，那么在调用connect 建立连接时，连接通常会立即建立成功，我们必须处理这种情况。
- *  2. 源自Berkeley的实现(和Posix.1g)有两条与select 和非阻塞IO相关的规则：
- *     A. 当连接建立成功时，套接口描述符变成可写；
- *     B. 当连接出错时，套接口描述符变成既可读又可写。
- *  @param ip 用于测速对Ip，应该是IPv4格式。
- *
- *  @return 测速结果，单位时毫秒，HTTPDNS_SOCKET_CONNECT_TIMEOUT_RTT 代表超时。
+ *  @return 测速结果，单位时毫秒，MSDKDns_SOCKET_CONNECT_TIMEOUT_RTT 代表超时。
  */
 - (float)testSpeedOf:(NSString *)ip port:(int16_t)port {
     NSString *oldIp = ip;
@@ -105,10 +87,8 @@ - (float)testSpeedOf:(NSString *)ip port:(int16_t)port {
     int s = 0;
     struct sockaddr_in saddr;
     saddr.sin_family = AF_INET;
-    // MARK: - 设置端口，这里需要根据需要自定义，默认是80端口。
     saddr.sin_port = htons(port);
     saddr.sin_addr.s_addr = inet_addr([ip UTF8String]);
-    //saddr.sin_addr.s_addr = inet_addr("1.1.1.123");
     if( (s=socket(AF_INET, SOCK_STREAM, 0)) < 0) {
         MSDKDNSLOG(@"ERROR:%s:%d, create socket failed.",__FUNCTION__,__LINE__);
         return 0;
@@ -118,9 +98,6 @@ - (float)testSpeedOf:(NSString *)ip port:(int16_t)port {
     //为了设置connect超时 把socket设置称为非阻塞
     int flags = fcntl(s, F_GETFL,0);
     fcntl(s,F_SETFL, flags | O_NONBLOCK);
-    //对于阻塞式套接字，调用connect函数将激发TCP的三次握手过程，而且仅在连接建立成功或者出错时才返回；
-    //对于非阻塞式套接字，如果调用connect函数会之间返回-1（表示出错），且错误为EINPROGRESS，表示连接建立，建立启动但是尚未完成；
-    //如果返回0，则表示连接已经建立，这通常是在服务器和客户在同一台主机上时发生。
     int i = connect(s,(struct sockaddr*)&saddr, sizeof(saddr));
     if(i == 0) {
         //建立连接成功，返回rtt时间。 因为connect是非阻塞，所以这个时间就是一个函数执行的时间，毫秒级，没必要再测速了。
@@ -130,7 +107,7 @@ - (float)testSpeedOf:(NSString *)ip port:(int16_t)port {
     struct timeval tv;
     int valopt;
     socklen_t lon;
-    tv.tv_sec = HTTPDNS_SOCKET_CONNECT_TIMEOUT;
+    tv.tv_sec = MSDKDns_SOCKET_CONNECT_TIMEOUT;
     tv.tv_usec = 0;
 
     fd_set myset;
@@ -148,7 +125,7 @@ - (float)testSpeedOf:(NSString *)ip port:(int16_t)port {
 
     if (j == 0) {
         MSDKDNSLOG(@"INFO:%s:%d, test rtt of (%@) timeout.",__FUNCTION__,__LINE__, oldIp);
-        rtt = HTTPDNS_SOCKET_CONNECT_TIMEOUT_RTT;
+        rtt = MSDKDns_SOCKET_CONNECT_TIMEOUT_RTT;
         close(s);
         return rtt;
     }
@@ -159,20 +136,13 @@ - (float)testSpeedOf:(NSString *)ip port:(int16_t)port {
         close(s);
         return rtt;
     }
-
     /**
      对于select和非阻塞connect，注意两点：
      [1] 当连接成功建立时，描述符变成可写； [2] 当连接建立遇到错误时，描述符变为即可读，也可写，遇到这种情况，可调用getsockopt函数。
      **/
     lon = sizeof(int);
     //valopt 表示错误信息。
-    // MARK: - 测试核心逻辑，连接后，获取错误信息，如果没有错误信息就是访问成功
-    /*!
-     * //getsockopt函数可获取影响套接字的选项，比如SOCKET的出错信息
-     * (get socket option)
-     */
     getsockopt(s, SOL_SOCKET, SO_ERROR, (void*)(&valopt), &lon);
-    //如果有错误信息：
     if (valopt) {
         MSDKDNSLOG(@"ERROR:%s:%d, select function error.",__FUNCTION__,__LINE__);
         rtt = 0;