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https://github.com/lmammino/s3st
A command line utility that allows you to stream data from multiple S3 objects directly into your terminal
https://github.com/lmammino/s3st
aws cloudtrail command-line logs s3 s3-bucket s3-storage streams
Last synced: about 1 month ago
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A command line utility that allows you to stream data from multiple S3 objects directly into your terminal
- Host: GitHub
- URL: https://github.com/lmammino/s3st
- Owner: lmammino
- License: mit
- Created: 2019-04-26T13:45:06.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2023-01-07T19:02:31.000Z (over 1 year ago)
- Last Synced: 2024-05-02T06:09:45.036Z (5 months ago)
- Topics: aws, cloudtrail, command-line, logs, s3, s3-bucket, s3-storage, streams
- Language: JavaScript
- Homepage: https://loige.co
- Size: 1.52 MB
- Stars: 74
- Watchers: 3
- Forks: 4
- Open Issues: 11
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# s3st
A command line utility that allows you to stream data from multiple S3 objects
directly into your terminal.
[](https://badge.fury.io/js/s3st)
[](https://circleci.com/gh/lmammino/s3st)
[](https://standardjs.com)
## Demo!
[](https://asciinema.org/a/dWJtrXA0HRqDJxndId9Xauz0e)
[See the FULL demo on asciinema](https://asciinema.org/a/dWJtrXA0HRqDJxndId9Xauz0e)
## Rationale
This utility is particularly useful when you are storing data in S3 and you want
to easily process the content of your S3 objects from your command line,
for instance if you are storing your CloudTrail logs in an S3 buckets and you
want to grep over them you can do something like this:
```bash
s3st mybucket AWSLogs/123456789/CloudTrail/eu-west-1/2019/01/17/ | jq . | grep "lambda"
```
By default the command line will be able to decompress most compressed files in
realtime (gzip, brotli and deflate).
## Install
There are several ways to install `s3st`:
### Install global with NPM
(Requires Node v10+):
```bash
npm i -g s3st
```
### Precompiled binaries
Alternatively you can download one of the pre-compiled binaries for linux,
windows, mac or alpine from the [Releases page](https://github.com/lmammino/s3st/releases).
These binaries do not require you to have Node installed.
### With [npx](https://www.npmjs.com/package/npx) (use without install)
```bash
npx s3st some-s3-bucket
```
## Usage
```bash
Usage: s3st [options] [prefix]
Options:
-v, --version output the version number
-D, --do-not-decompress Do not try to decompress files automatically (gzip, deflate, brotli)
-h, --help output usage information
```
`bucket` represents the name of the bucket to iterate over
`prefix` is an optional argument that you can pass to select a subset of object
that match the given prefix.
## Automatic Decompression
The command will automatically try to decompress compressed files based on their
extension, as per the following mapping:
- `.gz` or `.gzip`: decompress using gzip
- `.zz` or `.deflate`: decompress using deflate
- `.br` or `.brotli`: decompress using brotli (available only if using Node v11.7+)
If you want to disable this option you can specify the flag `--do-not-decompress`
## AWS Authentication
The tool will assume you have the proper environment variables or configuration
files properly set as per the [AWS CLI documentation](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-configure.html)
in order to authenticate requests to AWS.
## Programmatic usage
This package can also be used programmatically as per the following example:
```javascript
'use strict'
const createS3stStream = require('s3st')
const AWS = require('aws-sdk')
// creates an s3 client using the AWS SDK
const s3 = new AWS.S3()
const stream = createS3stStream(s3, 'mybucket', 'some-prefix')
stream.pipe(process.stdout) // attach the stream to standard output
```
`createS3stStream` exposes accepts the following arguments:
- `s3`: an s3 client instance from the AWS SDK or a compatible implementation
- `bucketName`: the name of the bucket
- `prefix` (optional): an object prefix to filter objects in the bucket
- `transform` (optional): a function that allows you to transform the content of
objects as they get streamed (useful for instance for decompression or decryption).
### Transform function
If you want to provide a custom transform function, it should respect the following
signature.
#### Arguments
- `key` (string): the name of the current object (object key)
#### Return value
- a `Transform` stream that manipulates the object
If you want to use the default decompression implementation available by the
default in the command line client, you can import that from [`s3st/src/transformers/decompress`](/src/transformers/decompress.js).
## Data Transfer costs
If you are using this tool to stream large amount of data be aware that this might have an impact on your [data transfer costs](https://blog.cloudability.com/aws-data-transfer-costs/). In such cases, using an alternative approach like [S3 Select](https://docs.aws.amazon.com/AmazonS3/latest/dev/selecting-content-from-objects.html), could be a way to save on cost.
Make sure you are aware of alternatives and that you make careful costs considerations before running any heavy workload in the cloud.
## Contributing
Everyone is very welcome to contribute to this project. You can contribute just by submitting bugs or
suggesting improvements by [opening an issue on GitHub](https://github.com/lmammino/s3st/issues).
You can also submit PRs as long as you adhere with the code standards and write tests for the proposed changes.
## License
Licensed under [MIT License](LICENSE). © Luciano Mammino.