s3

Last updated: 2024-09-17 21:08:47.720577 File source: link on GitLab

s3

• Project README

• Release/Build Status

• Changelog

• License

• Contribution Guidelines

• Code of Conduct

• Secure Coding Guidelines

Table of Contents

1. Description

2. Structure and Organisation

3. Class Diagram

4. Functionality

5. Data Types

6. Testing

7. Proposed Functionality/Requirements

8. References

Specification

Description

This sub package is an implementation of StorageProvider interface for S3 storage.

Structure and Organisation

Here is quick overview of the contents of this pacakge:

• README: Current file which is aimed towards developers who wish to use and modify the functionality.

• download: This file defines functionality to allow download of files and directories from S3 buckets.

• helpers: This file defines helper functions for working with AWS S3 storage.

• init: This file initializes an Open Telemetry logger for the package.

• s3_test: This file contains unit tests for the package functionality.

• s3: This file defines methods to interact with S3 buckets using the AWS SDK.

• specs_decoder: This file defines S3 input source configuration with validation and decoding logic.

• upload: This file defines S3 storage implementation for uploading files (including directories) from a local volume to an S3 bucket.

Class Diagram

The class diagram for the s3 sub-package is shown below.

Source file

s3 Class Diagram

Rendered from source file

!$rootUrlGitlab = "https://gitlab.com/nunet/device-management-service/-/raw/main"
!$packageRelativePath = "/storage/s3"
!$packageUrlGitlab = $rootUrlGitlab + $packageRelativePath
 
!include $packageUrlGitlab/specs/class_diagram.puml

Functionality

NewClient

• signature: NewClient(config aws.Config, volController storage.VolumeController) (*S3Storage, error)

• input #1: AWS configuration object from AWS SDK

• input #2: Volume Controller object

• output (sucess): new instance of type storage.s3.S3Storage

• output (error): error

NewClient is a constructor method. It creates a new instance of storage.s3.S3Storage struct.

Upload

For function signature refer to the package readme

Upload uploads all files (recursively) from a local volume to an S3 bucket. It returns an error when

• there is error in decoding input specs

• there is an error in file system operations (ex - opening files on the local file system etc)

• there are errors from the AWS SDK during the upload process

Download

For function signature refer to the package readme

Download fetches files from a given S3 bucket. It can handle folders but except for x-directory. It depends on the file system provided by storage.VolumeController. It will return an error when

• there is error in decoding input specs

• there is error in creating a storage volume

• there is an issue in determining the target S3 objects based on the provided key

• there are errors in downloading individual S3 objects

• there are issues in creating directories or writing files to the local file system

• the storage.VolumeController fails to lock the newly created storage volume

Size

For function signature refer to the package readme

Size determines the size of an object stored in an S3 bucket.

It will return an error when

• there is error in decoding input specs

• there is an issue in AWS API call to retrieve the object size

Data Types

• storage.s3.S3Storage: TBD

type S3Storage struct {
	*s3.Client
	volController storage.VolumeController
	downloader    *s3Manager.Downloader
	uploader      *s3Manager.Uploader
}

• storage.s3.s3Object: TBD

type s3Object struct {
	key       *string
	eTag      *string
	versionID *string
	size      int64
	isDir     bool
}

• storage.s3.S3InputSource: TBD

type S3InputSource struct {
	Bucket   string
	Key      string
	Filter   string
	Region   string
	Endpoint string
}

Refer to package readme for other data types.

Testing

The various unit tests for the package functionality are defined in s3_test.go file.

Proposed Functionality / Requirements

List of issues

All issues that are related to the implementation of storage package can be found below. These include any proposals for modifications to the package or new data structures needed to cover the requirements of other packages.

• storage package implementation TBD

References