Question

使用this other SO Post，我能够确定如何最好地确定对象是否已在我的S3存储桶中。但是，我的代码似乎不合时宜，并且我不熟悉AWS错误。

对于初学者来说，我知道我的AWS可以正常工作，因为我已经拥有访问存储桶的代码。

static func uploadData(data:Data, progressHandler: @escaping (_ progress:Progress) -> Void, completionHandlerFunction: @escaping () -> Void, DBKey:String) {

    let expression = AWSS3TransferUtilityUploadExpression()
    expression.progressBlock = { (task, progress) in
        DispatchQueue.main.async(execute: {
            progressHandler(progress)
        })
    }

    var completionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?
    completionHandler = { (task, error) -> Void in
        DispatchQueue.main.async(execute: {
            completionHandlerFunction()
            if(error != nil) {
                print(error!.localizedDescription)
            }
            else {
                print(task.response!)
            }
        })
    }

    let transferUtility = AWSS3TransferUtility.default()

    transferUtility.uploadData(data,
                               bucket: self.bucketName,
                               key: DBKey,
                               contentType: "video/mp4",
                               expression: expression,
                               completionHandler: completionHandler).continueWith {
                                (task) -> AnyObject? in
                                if let error = task.error {
                                    print("Error: \(error.localizedDescription)")
                                }

                                if let _ = task.result {
                                    // Do something with uploadTask.
                                }
                                return nil;
    }
}

所以，我尝试类似的策略来确定某项是否存在

static func checkForItem(item:String, foundHandler: @escaping () -> Void, notFoundHandler: @escaping () -> Void) {
    let s3 = AWSS3.default()

    let request = AWSS3HeadObjectRequest()
    request!.bucket = Storage.bucketName
    request!.key = item

    s3.headObject(request!).continueWith { (task) -> Any? in
        if let error = task.error {
            notFoundHandler()
        }
        else {
            foundHandler()
        }
        return 0
    }
}

但是，似乎我越过let s3 = AWSS3.default()的那一刻，它就进入

为什么有AWSS3.default()会提供这种情况的任何方法？我什至没有访问我的存储桶或任何重要信息。我的Cocoapods是最新的（只需运行它们），但我愿意尝试任何使它起作用的方法。感谢您的帮助！

Answer 1

我使用Amazon Web Service的Mobile Hub下载了awsconfiguration.json并将其粘贴在应用程序中。

{
    "UserAgent": "MobileHub/1.0",
    "Version": "1.0",
    "CredentialsProvider": {
        "CognitoIdentity": {
            "Default": {
                "PoolId": "MyPoolID",
                "Region": "MyRegion"
            }
        }
    },
    "IdentityManager": {
        "Default": {}
    },
    "S3TransferUtility": {
        "Default": {
            "Bucket": "MyBucket",
            "Region": "MyRegion"
        }
    },
    "DynamoDBObjectMapper": {
        "Default": {
            "Region": "MyRegion"
        }
    },
    "PinpointAnalytics": {
        "Default": {
            "AppId": "myAppId",
            "Region": "MyRegion"
        }
    },
    "PinpointTargeting": {
        "Default": {
            "Region": "MyRegion"
        }
    },
    "UserFileManager": {
        "Default": {
            "Bucket": "MyBucket",
            "Region": "MyRegion"
        }
    },
}

但是，我没有S3部分。它不是来自Mobile Hub，所以我决定对其进行编辑，看看它是否有效并且确实有效！我添加了这个，

"S3": {
    "Default": {
        "Bucket": "MyBucket",
        "Region": "MyRegion"
    }
}

到json的底部，它起作用了！

对于其他遇到亚马逊问题的人，请确保您已正确配置所有aws文件！

AWS S3 HeadObject无法解决Dispatch_Once

1 个答案: