jp2011 / file-watch

This is a script that can be run periodically to check if a file given by its URL has changed. If there has been an update to the file, the script will publish a message to an SNS topic.

FileWatcher

FileWatcher is a script that checks if there has been an update to a remote file, e.g. list of trades published by a stock exchange.

This script was originally written to be run as an AWS Lambda instance which stores version hash in an S3 bucket and publishes notifications using Amazon SNS.

Deployment

In order to deploy the script in AWS for your use case you need to:

1. Set FILE_URL to the url of the file your script will be watching
2. Set S3_BUCKET_NAME to the name of your bucket you want to use for storing hash of the current version of the document
3. Set S3_FILE_KEY to the key that will be used to identify the document in the bucket.
4. Set SNS_TOPIC_ARN to the ARN identifier of the SNS topic that will publish events on any update to the document
5. Set EMAIL_SUBJECT and EMAIL_BODY which will be used as subject and body of the SNS message, respectively.

Additional Notes

• Make sure you create appropriate roles and policies to set up permissions for different AWS resources. All of it can be done quite easily from the console.