With sufficiently large files, or a large quantity of small files, the whole thing crashed. Distraught that my precious Python was failing me, I found several sources on the internet that suggested this idea did work when using Node, and worked especially well as an AWS Lambda function.
This sounded like a good idea to me, because a Lambda function will definitely not allow you to use too much memory, disk space, or time. I guess it was time to learn! I learned. Long story short again , it took a little bit of research, but I came up with this Lambda function which successfully zips up hundreds of files directly into a zip file on S3, without any real memory usage and definitely no disk usage.
It took some research, because none of the examples people had posted online actually worked flawlessly from beginning to end. For all I know, this script has some issues, but I haven't run into them yet, and when I do, I will update it to avoid them. Lastly, because we just want to monitor this directory for newly added files and not for file changes, file deletions, and aged files , we just leave the Monitor file add checkbox ticked.
Now that we have directory monitor for monitoring a folder in our S3 bucket, the next thing we need to do is create a trigger that would automatically download each newly added file that's detected by the directory monitor.
Give the trigger a name, say, 'download new s3 files', give it a suitable description something that will give other server admins an idea what this particular trigger does , and select Directory Monitor File Added from the Event type drop-down list. In the Trigger Conditions dialog, one of the things you'll want to specify is the name of the directory monitor. This is important because, in a production MFT Server instance, there's going to be a really good chance you'll have multiple directory monitors running simultaneously.
You don't want this trigger responding to every single Directory Monitor File Added event thrown out there. To specify a monitor name, just click the Variables button and select the MonitorName variable or you can enter that directly in the expression box and then enter an expression similar to the one you see below:. In the succeeding screen, click the Add button and select Trading Partner File Download from the drop-down list.
If you want to download multiple files as zipped from AWS S3, and you have your server to take care of the file metadata handlings, then this article may help you understand how the process works. AWS doesn't provide the default multi-files download, so in order to achieve you may want to add lambda function or to use your own implemented service.
This article uses the custom service to support multi-files download function. To know the basic setup of the code AWS keys, the meaning of Key in the code, bucket, etc.
Click on the create bucket and fill all the data, You will also need to select rules like permissions and all. Save those key in your machine because we will need those keys in order to perform any actions on it. Now create a new nodejs project using following command. I assume that you have downloaded node in your machine.
Above dependecies are used to create express server and upload files. We will need express file upload middleware to upload files, we also can create own functionality to create temporary folder and store file in folder, once it is uploaded we can delete that folder.
In routes folder we will create routes of api and we will send response based on actions, We surely can create controller folder but as of our job can be done using route.
In utils utility folder we will create one file which is called s3. Here we are having post method, We will get one file from front-end or you can use post man here. So we will need some parameters to send to s3, so s3 can know that where to upload file and in which bucket to.
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