AWS API 网关刷新不可靠

Question

我使用 API 网关有一段时间了，我只是稍微更改了 api 以允许另一个功能。我进入 api 网关并测试了该功能以确保其正常工作。然后我在 iPhone 上试了一下，效果也不错。后来随机地，我开始收到 {errorMessage: "Task timed out after 3.00 seconds"} 的重复实例。我不明白为什么一个简单的登录方法（API Gateway 中的方法）会超时，特别是因为我在 iPhone（之前工作时）和直接使用api 网关控制台。

评论：我没有使用生成的 sdk 或 AWSAPIGatewayClient。我只是在发出一个 http 请求。

http 请求登录

 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSMutableDictionary *post = [[NSMutableDictionary alloc] initWithObjectsAndKeys:
                      [defaults objectForKey:@"username"], @"username",
                      [defaults objectForKey:@"password"], @"password",
                      nil];
NSError *error;
NSData *postData = [NSJSONSerialization dataWithJSONObject:post options:0 error:&error];
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:@"someLoginEndpoint"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setHTTPBody:postData];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    NSDictionary *newJSON = [NSJSONSerialization JSONObjectWithData:data
                                                            options:0
                                                              error:&error];
    if(!newJSON || [newJSON objectForKey:@"errorMessage"]){
        NSLog(@"%@",newJSON);
        callBack(false);
        NSLog(@"DID NOT AUTHENTICATE");
    }else{
        NSLog(@"%@",newJSON);
        [defaults setValue:[newJSON objectForKey:@"Token"] forKey:@"Token"];
        [defaults setValue:[newJSON objectForKey:@"IdentityId"] forKey:@"IdentityId"];
        [self authenticateUser:^(BOOL call){
            callBack(call);
        }];
    }
}] resume];

刷新方式

- (AWSTask *)refresh {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![self authenticatedWithProvider]) {
    return [super getIdentityId];
}else{
    NSDictionary *post = [[NSDictionary alloc] initWithObjectsAndKeys:
                          [defaults objectForKey:@"username"], @"username",
                          [defaults objectForKey:@"password"], @"password",
                          nil];
    NSError *error;
    NSData *postData = [NSJSONSerialization dataWithJSONObject:post options:0 error:&error];
    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"someLoginEndpoint"]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    __block BOOL isLogged = false;

    [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSDictionary *newJSON = [NSJSONSerialization JSONObjectWithData:data
                                                                options:0
                                                                  error:&error];
        isLogged = true;
        if(!newJSON){
            NSLog(@"DID NOT AUTHENTICATE");
        }else{
            NSLog(@"The IdentityID in the refresh method: %@",[newJSON objectForKey:@"IdentityId" ]);
            NSLog(@"The token in the refresh method: %@",[newJSON objectForKey:@"Token" ]);
        self.identityId = [newJSON objectForKey:@"IdentityId" ];
        self.token = [newJSON objectForKey:@"Token" ];
        }

    }] resume];

    return [super getIdentityId];

}
return [super getIdentityId];
}

验证用户

 //BusytimeAuthenticated
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
id<AWSCognitoIdentityProvider> identityProvider = [[BusytimeAuthenticated alloc] initWithRegionType:AWSRegionUSEast1
                                                                                         identityId:nil
                                                                                     identityPoolId:@"somePoolID"
                                                                            logins:@{@"cognito-identity.amazonaws.com": [defaults objectForKey:@"Token"]}
                                                                                       providerName:@"cognito-identity.amazonaws.com"
                                                   ];

credentialsProvider = [[AWSCognitoCredentialsProvider alloc] initWithRegionType:AWSRegionUSEast1
                                                               identityProvider:identityProvider
                                                                  unauthRoleArn:nil
                                                                    authRoleArn:nil];
configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSEast1
                                            credentialsProvider:self.credentialsProvider];
AWSServiceManager.defaultServiceManager.defaultServiceConfiguration = configuration;
[[credentialsProvider refresh] continueWithBlock:^id(AWSTask *task){
    callBack(true);
    return nil;
}];

}

错误无法刷新。错误是 [Error Domain=com.amazonaws.AWSCognitoIdentityErrorDomain Code=10 "(null)" UserInfo={message=Invalid login token。无法传入 Cognito 令牌。，__type=NotAuthorizedException}]

我的基本问题是，为什么这个操作如此不可靠？它偶尔可以登录我的用户，然后当我使用刷新方法时，我传递了相同的凭据，但并排请求导致第二个请求失败。

Answer 1

关于超时：

如评论中所述，Lambda 冷启动可能会导致您的 API 网关调用超时，您可能需要优化 Lambda 以避免超时。

关于刷新错误：

您正在登录映射中使用 cognito-identity.amazonaws.com，但使用 IdentityProvider 模式进行刷新。这就是第一次身份验证成功但尝试刷新失败的原因。刷新中的逻辑永远不会触发。

我建议您查看我们的 end-to-end sample 以了解处理开发人员身份验证的建议流程。

如果您想继续在登录映射中使用 cognito-identity.amazonaws.com，那么您的令牌刷新实际上需要在 外部处理identity/credentials 提供商的 ，类似于您处理 Facebook 令牌的方式。

AWS API 网关刷新不可靠

AWS API Gateway unreliability in refresh

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