本文介绍了AWSS3TransferUtility：如何在应用重启后重试失败的上传任务的处理方法，对大家解决问题具有一定的参考价值
问题描述
我想在应用重启后重试之前失败的S3上载任务。在app init上，我调用 // register a transfer utility object asynchronously
AWSS3TransferUtility.register(
with: configuration!,
transferUtilityConfiguration: tuConf,
forKey: "..." // redacted
) { (error) in
if let error = error {
// handle registration error.
Logging.logError("Error in registration: (error)")
} else {
Logging.logDebug("AWS S3 TransferUtility registration success, now check for pending tasks")
DispatchQueue.global().asyncAfter(deadline: .now() + 2.0) {
finishPendingTasks()
}
}
}
下面是完成待定任务的函数
static func finishPendingTasks() {
let transferUtility = AWSS3TransferUtility.default()
let uploadTasks = transferUtility.getUploadTasks().result
Logging.logDebug("Finish pending AWS upload tasks")
var progressBlock: AWSS3TransferUtilityProgressBlock?
progressBlock = {(task, progress) in
DispatchQueue.main.async(execute: {
// Do something e.g. Update a progress bar.
Logging.logDebug("upload in process (progress)")
})
}
var completionHandler: AWSS3TransferUtilityUploadCompletionHandlerBlock?
completionHandler = { (task, error) -> Void in
DispatchQueue.main.async(execute: {
// Do something e.g. Alert a user for transfer completion.
// On failed uploads, `error` contains the error object.
Logging.logDebug("upload completed1 (task.bucket)")
Logging.logDebug("upload completed2 (String(describing: task.response))")
Logging.logDebug("upload completed3 (task.key)")
Logging.logDebug("upload error (String(describing: error))")
})
}
let taskCount = uploadTasks?.count ?? 0
Logging.logDebug("Number of upload tasks: (taskCount)")
for task in uploadTasks! {
if let awsTask = task as? AWSS3TransferUtilityUploadTask {
Logging.logDebug("Resuming uploading task key (awsTask.key), transfer ID: (awsTask.transferID), status: (awsTask.status.rawValue)")
awsTask.setCompletionHandler(completionHandler!)
awsTask.setProgressBlock(progressBlock!)
awsTask.resume() // <------- HAS NO EFFECT!
}
}
}
状态rawValue为0
不确定Resume()是否是触发重试的原因。是否有记录在案的程序？未看到完成处理程序/进度块生效。
查看this时，AWS似乎并未真正跟踪与任务关联的数据，似乎必须手动维护和上载数据。
知道如何处理重试吗？
推荐答案
默认情况下，重试限制似乎为0。可以通过设置
来更改AWSS3TransferUtilityConfiguration().retryLimit = ...
Resume()在这种情况下不适用。
这篇关于AWSS3TransferUtility：如何在应用重启后重试失败的上传任务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，WP2