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s3replace

This repository is based on DallasMorningNews/s3replace

Screenshot

Sometimes we have to replace the same thing in lots of files in an S3 bucket - for example, when the paywall code changes or when we switch commenting vendors. This repo is our automated solution.

It uses the AWS API to roll through all of the objects in a bucket:

  1. Filtering the objects to search using a regular expression, it downloads any object that matches.
  2. Of those objects that match, it uses another regular expression to check does the content match to the requirements.
  3. Then iterate over on an array of regular expressions to find the relevant code to replace.
  4. If the object's content is a match:
    • In the standard mode you'll be given a preview and asked for confirmation before anything is changed.
    • In the force mode the file will be overridden without confirmation.
    • In the dry run mode only the preview will be shown.
  5. It replaces the code, copying metadata such as the ContentType, ContentDisposition and other key fields.
    • A backup of the file is saved locally, just in case.
    • Log for each change or match will be written to a log file.

Requirements

  • Python 3 - in Mac brew install python in Debian it is installed by default
  • pipenv - in Mac brew install pipenv in Debian sudo apt install pipenv

Installation and setup

  1. Clone this repo
  2. Install requirements using pipenv.

Usage

Configuration

In s3replace/main.py:

  • Update the needle_pattern at the top. This pattern will be used by re.search to find matching documents and it'll be the content that is replaced using re.sub.

  • Set the needle_pattern_list array, each pair consists of:

    • set replace_with at the top of the file to the text you want to replace the needle_pattern with
    • update the key_pattern variable to match the keys you want to run needle_pattern against; the more specific this is, the better; files that match this won't be downloaded, which is the slowest part of the process

  • needle_pattern_max_count is the number of times needle_pattern should be found in the file before it is replaced, otherwise the file will be skipped, and a copy of it will be saved in backups/too_many_matches

Backup and logging

The script automatically creates backup of the original content of the objects/files im backups/. If a backup copy exists it it won't be overwritten.

The script also writes log files in the logs/ directory.

Running

This runs as a command line tool. See all the options by running python s3replace --help:

python s3replace --help
Find and replace for an S3 bucket.

Usage:
  s3replace <bucket> [--dry-run|--force-replace] --access-key-id=<key> --secret-access-key=<key>
  s3replace -h | --help
  s3replace --version

Options:
  --help                    Show this screen.
  --dry-run                 Do not replace.
  --force-replace           Replace without confirmation.
  --version                 Show version.

  --access-key-id=<key>     AWS access key ID
  --secret-access-key=<key> AWS secret access key

Basic usage only requires a bucket name and credentials:

python s3replace <bucket> --dry-run --access-key-id=<your_id> --secret-access-key=<your_key>

You can pass your AWS credentials using the flags, as above, or you can provide them using any of the other methods supported by boto3.

Get list of the backup files

find backups/ -type f -printf '%d\t%P\n' | sort -r -nk1 | cut -f2-

Helpers

Upload test content.

aws --profile plexop s3 cp /mnt/c/xampp/htdocs/Creative/aserving-4/0-szs-test/ "s3://static-plexop/aserving/4/0/" --recursive

Create a list of the changed files/pages from the logs.

cat logs/*log | grep -Po '^Replace object:.*$' | sort -u | sed 's#Replace object: #https://static-plexop.s3.amazonaws.com/#' > logs/pages.log

Create a list of the changed files/pages from the backup directory.

cd backups
find aserving/ -type f | sort -u | sed 's#^#https://static-plexop.s3.amazonaws.com/#' > pages.log

Check if there are any differences between the two lists.

diff -c backups/pages.log logs/pages.log

Create backup of the collected data.

tar -zcvf backup.tgz backups logs