Notice how I create flask instance. Next I will create main. In the above source code, the root path or endpoint will simply render the UI. This UI contains only one link for downloading a file from the server.
Clicking on the link will ask user to save the file in a chosen location. The file type could be anything. As you see I have tested with four types of files. I hope this example will work with other file types as well.
Now create a download. Notice in the above template file I am using Flask EL Expression language to evaluate the link endpoint. Now navigate to the project root directory from command line tool and execute the command python main.
If you want to change the port then you can change the line app. There are however situations where downloads are interrupted so that you end up with a broken file on your system that you cannot do anything with.
Several users who tried to download the excellent Tech Toolkit I reviewed yesterday for example have reported that downloads of the 1. It can be quite frustrating if that happens regularly, especially if your computer's Internet connection is not super fast. If you download with 50 Mbit or more, you may not mind if you have to repeat the download, but if you are on a slower connection, you may very well do.
As far as solutions are concerned, there is only one that is suitable and that is to use download managers. The main benefit of download managers is that they support resume. While the server the file is hosted on needs to support it as well, it ensures that the download will continue after it was interrupted previously.
Instead of having to download the large file over and over again from the beginning, downloads would restart from where the previous download stopped with a little overhead.
Download managers may support additional features such as download acceleration, scheduling, or grabbing of media. The following selection lists several download managers that you can use to download files of any size to your local system. Some integrate into web browsers while others may need to be started manually instead to pick up the downloads. Available as a full and lite version lite ships without Bittorrent support, video conversion plugin and languages , it offers to add plugins to Firefox or Chrome.
These plugins are not required but they make things easier for users of supported browsers. A right-click on a file and the selection of "download with Free Download Manager" sends the download to the application where it will be processed. The program supports a variety of features such as scheduling downloads, adding it to groups or authentication.
The download manager splits files into segments which it downloads separately from each other to improve the download speed. In addition to that, it supports resume so that interrupted downloads can be restarted where they stopped. FlashGet does not ship with browser extensions but it monitors the Windows clipboard for file links and will pick those up automatically so that it is easy to add downloads to the application.
It highlights the size of the file that will be downloaded to the local system, and supports multiple download threads, authentication and options to categorize downloads. The download manager supports resume so that broken downloads are a thing of the past, provided that the server is also supporting resume. The EagleGet download manager is available as a portable version and installer. That's however not necessary to add downloads to it.
Since it monitors the clipboard, all you have to do is copy links pointing to files to the clipboard so that they are picked up automatically by the software. EagleGet ships with a truckload of features such as download scheduling, batch downloads, download acceleration using threading, a speed limiter or options to resume broken downloads. The Linux download manager is also available as a Windows build. It supports clipboard monitoring to pick up files automatically if they have a matching file extension.
The download dialog that opens prior to that enables you to make modifications to the process. Here you can add authentication information, select the number of retries and the delay between retries, change the number of connections per server, or limit the download speed.
The download manager ships with a browser built-in which makes it feel bloated, especially if you don't require that. It does monitor clipboard events though and will pick up downloads automatically. The programs listed in this category have been designed specifically for so-called file hosting services.
They download files from sites such as Mediafire or Mega. Note : Programs listed in this category may contain offers adware when you install them. It is highly recommended to pay attention to the installation dialog and select custom when possible to stay in control. Free Rapid Downloader - The program requires Java to run. It supports more than sites according to the feature list on the developer website.
JDownloader - The program supports hundreds of file hosting services but requires Java to run. It monitors the clipboard and will add downloads automatically to its queue if they are hosted on a supported server. The cross-platform program supports many extra features such as support for premium accounts, browser integration, OCR modules or the automatic extraction of password protected archives.
MiPony - The program supports hundreds of file hosting services and extra features just like JDownloader does. PyLoad - The program does not support as many hosters as JDownloader or MiPony, but it may make up for it in other ways. It has been designed with low hardware requirements in mind, and while it makes sure of that, it does not sacrifice core functionality for it.
With that said, it is difficult to set up as you need to run a configuration script first on the command line and run a core program first before you can connect clients to it. There is no definitive answer to that question. It depends on what you require more than anything else. Do you want integration into web browsers or is clipboard monitoring or manual pasting of download links sufficient? Do you require features such as support for authentication or proxy servers, scheduling or support for protocols such as Bittorrent or ftp?
Commercial Alternative : Internet Download Manager. I miss GNU Wget from the list. I would also like to request that you take a look at Download Ninja and compare it to others.
YawningAngel 7 months ago parent prev next [—]. The parent was asking how to copy data without it flowing through a compute instance. The s3 api does have a copy method, which performs the operation within s3 without compute acting as an intermediary. It is directly checking for s3 to s3[1] and indicates that it wants to copy I've read over it and I'm reasonably sure that it's going to issue CopyObject, but it would take me actually getting out paper and pen to really track it down.
Not because there's any obvious AbstractSingletonProxyFactoryBean, but rather that there's no instance that stands out as "this is where they went wrong" and nevertheless the end result is a confusing mess of inheritance and objects.
Not to mention the insane over engineering of a python 2. This is useful to know! I've been using it for some time and it's plenty fast. No mention of how it compares to s4cmd which like s3cmd is python.
I had tried both a couple of years back and at that time s5cmd was significantly faster when downloading multiple s of files, hence my loyalty to it. Of course both are actively developed projects, so things might have changed since.
There is aioboto3 which wraps boto3 in asyncio calls. It's a lot simpler than all of this. Having used aiobotocore, it's pretty good. It can be a bit sketchy about releasing connection pools, though. Normally you shouldn't run into any issues, but we've had trouble with running out of filehandles on AWS Lambda. I would also point out that for many cases, using a ThreadPoolExecutor works fine. I maintain a simulation engine and it's distributing work out to AWS Lambda.
So I had two distributors, one thread based and one async based. Also one based on multiprocessing that runs work on a local machine. From my tests, the performance is basically equivalent, which is not surprising: most of it was just waiting and then processing incoming responses. Threads work great at this, and botocore is designed to work with threads.
I eventually went with async because Python doesn't let you prioritize threads. That means that if you get a "stop" signal, in the threaded model, the command thread is competing with many worker threads. In the async model, the workers are all in one thread, so the command thread will be woken up per the switch interval[1]. So, broadly, if you're going to need a command channel that must respond in a timely fashion, I'd recommend piling workers into an event loop through async. The other possibility is to have a command channel run in another process, but then you need to get the fork right, do IPC, etc.
In this case I just wanted to keep it simple and do it the "native" way. I've been hearing a lot about aioboto3 and I'll surely check it out. That issue is just botocore not supporting async, which aiobotocore addresses. It's also very long; is there a particular comment on that issue that you wanted to point out? I just mentioned the issue because a colleague of mine did some quick tests with aioboto3 and he told me it was downloading the files sequentially.
We thought it might be related to that. You made a great point about going async if you need a working command channel. Have you benchmarked this solution on a high bandwidth connection? If so, what's the max throughput that it achieved? Unfortunately I haven't. If someone wants to benchmark this solution I'd be glad to hear about that!
0コメント