vastlaser.blogg.se - Polling in sqs queue python

POLLING IN SQS QUEUE PYTHON ZIP FILE
POLLING IN SQS QUEUE PYTHON DOWNLOAD

However, I want to be able to update the user interface inside the web browser.Ĭontinuous polling by the front-end server for the finished zip file on S3. This seems like a great approach if we were simply wanting to send an email to the user, letting them know their job has finished. In addition, how does SQS notify the open socket that the job is complete? This article regarding Amazon SNS looked promising at first, but they seem to infer that it is best practice to use a single SNS topic for the entire queue, not an SNS topic per job.

From everything I have read, it is not best practice (and sometimes not possible) to create a large number of open pub/sub sockets/channels.

Use pub/sub to create a socket for the job, and return the response when complete. We are struggling with the best way to notify the end user in real-time that their job has finished and their file is ready for download.įrom my research I have seen three ways that people suggest: This process appears to be a solid approach, and everything makes sense up until step 4.

Now that the queue has finished processing, alert the client that their job is done and their file is ready for download.

When a job is found, the worker downloads the files from S3, zips them up, and returns the finished zip file to the specified location on S3. The queue worker uses long polling to check for new SQS jobs.Front-end sends a request to SQS with the files to be zipped, and the destination (on S3) where the final zip file will be stored.User selects files and requests a zip file to be created.Our application is AWS cloud based, so my first instinct is to use Amazon SQS (but am open to other suggestions) to build a queue system to handle these requests.

POLLING IN SQS QUEUE PYTHON DOWNLOAD

While the process is running, the front-end will tell the user their request is processing, and when it is complete, it will prompt them to download the file. We would like the process to work in real time, so that when the user clicks the button to download a zip file, the system processes the request, compiles the zip, and returns the zip to the end user. We would like to add a feature to the system that allows users to select multiple files at once and download them as a zip file. Currently those users can download the files directly from S3/Cloudfront through our application. It has also been suggested that the SNS could be used to notify the scripts of the message queue status but I do not see how you could configure a responsive system with SNS as the metric alarms are not fine grained enough.Our application allows users to upload (Amazon S3) and manage their files through our interface. In this question Processing items in SQS queue with a php script it was mentioned that 'sqs ruby client library has a method "poll" which continuously polls the queue and on receiving a message in the queue passes it on to a block'. How do I make this script constantly listen for new additions to the queue, even while the queue is empty? new messages are added to the queue (or will I miss them?).other instances take messages off the queue (or am I going to double up).The script processes messages from a SQS queue: import botoĭoes using the while statement make sense? Does count() update in real time as: I have a python script using the boto library on ec2 instance which is part of an autoscaling group.