README

Incremental and atomic high-performance deployments for AWS S3.

• incremental: using a fast diff algorithm, this package only uploads changed files based on their contents.
• atomic: even thought atomicity is not supported by AWS S3, this package performs uploads in the most optimal way to nearly achieve the same result.
• high-performance: updates to sites with 100K files are usually deployed in ~10 seconds

Why don't use aws s3 sync --delete?

aws s3 sync --delete uses two metrics to decide whether to sync from source to destination:

• file size
• timestamp

This works well in most cases, but not when you are deploying a site generated by a Static Site Generator like Gatsby. Gatsby re-generates all files on each build, so aws s3 sync --delete will upload all files since all of them are "new".

This package, on the contrary, uses a smarter (and faster) strategy: it compares file contents to decide whether to sync it or not. Hence, if your site contains thousands of files, but only 4 of them have changed, this package updates only those 4 files.

Installation

composer require asilgag/aws-s3-incremental-deployer

Dependencies

This package makes intensive use of the Unix shell. The following Unix commands MUST be present so this package can work as expected:

• aws (AWS CLI)
• find
• sort
• xargs
• sha1sum

Therefore, this package does not work on non-Unix OS (Windows, etc).

ACL Permissions

The user performing the deployment MUST be granted the following ACL Permissions:

• READ
• WRITE
• READ_ACP

Incremental deploys

Instead of using a "aws s3 sync" command to synchronize a local folder to a bucket, this package uses a different strategy.

It makes use of the Unix command sha1sum to get the checksums of all files from a local folder, and then it compares it with the last deployed version hosted in a bucket. Then, it detects which files are new, edited or deleted, and it handles uploading them in the most "atomic" possible way:

• first, new assets and pages
• second, updated assets and pages
• third, homepage

You should use a CDN (CloudFront, Akamai, etc) with a proper cache policy to ensure no one access a broken version of your site while it's being uploaded.

Usage

use Asilgag\Aws\S3\AwsS3IncrementalDeployer;
use Asilgag\Aws\S3\Logger\MultiLogger;

// Use any PSR-3 compatible logger
$multiLogger = new MultiLogger('/path/to/log/file', TRUE);

// Create a AwsS3IncrementalDeployer object and configure its behaviour.
$deployer = new AwsS3IncrementalDeployer($multiLogger);

// Optional. Define an array of relative paths that shouldn't be uploaded.
$deployer->setExcludedPaths(['relative/path/to/exclude/in/all/cases/*']);

// Optional. Add options to the "aws" part of the command (--region, --profile, etc)
$deployer->getAwsCli()->getAwsOptions()->add('--region eu-east-1');

// Optional. Set environment for the command.
$deployer->getAwsCli()->setEnvironment('AWS_ACCESS_KEY_ID', '***');
$deployer->getAwsCli()->setEnvironment('AWS_SECRET_ACCESS_KEY', '***');

// Execute deploy operation.
try {
   $deployer->deploy('/path/to/local/site', 'bucket-name');
}
catch (RuntimeException $e) {
   // Do some logging
}