Soto for AWS
Soto is a Swift language SDK for Amazon Web Services (AWS), working on Linux, macOS and iOS. This library provides access to all AWS services. The service APIs it provides are a direct mapping of the REST APIs Amazon publishes for each of its services. Soto is a community supported project and is in no way affiliated with AWS.
Table of Contents
- Structure
- Swift Package Manager
- Compatibility
- Configuring Credentials
- Using Soto
- Documentation
- Contributing
- License
Structure
The library consists of three parts
- soto-core which does all the core request encoding and signing, response decoding and error handling.
- The service api files which define the individual AWS services and their commands with their input and output structures.
- The CodeGenerator which builds the service api files from the JSON model files supplied by Amazon.
Swift Package Manager
Soto uses the Swift Package Manager to manage its code dependencies. To use Soto in your codebase it is recommended you do the same. Add a dependency to the package in your own Package.swift dependencies.
dependencies: [
.package(url: "https://github.com/soto-project/soto.git", from: "5.0.0")
],
Then add target dependencies for each of the Soto targets you want to use.
targets: [
.target(name: "MyApp", dependencies: [
.product(name: "SotoS3", package: "soto"),
.product(name: "SotoSES", package: "soto"),
.product(name: "SotoIAM", package: "soto")
]),
]
)
Alternatively if you are using Xcode 11 or later you can use the Swift Package Manager integration and add a dependency to Soto through that.
Compatibility
Soto works on Linux, macOS and iOS. It requires v2.0 of Swift NIO. If you use v1.0 of Swift NIO then you will need to use v3.5 of Soto. Below is a compatibility table for different Soto versions.
Version | Swift | MacOS | iOS | Linux | Vapor |
---|---|---|---|---|---|
5.x | 5.1 - | ✓ | 12.0 - | Ubuntu 14.04-20.04 | 4.0 |
4.x | 5.0 - | ✓ | 12.0 - | Ubuntu 14.04-20.04 | 4.0 |
3.x | 4.2 - | ✓ | Ubuntu 14.04-18.04 | 3.0 |
Configuring Credentials
Before using the SDK, you will need AWS credentials to sign all your requests. Credentials can be provided to the library in the following ways.
- Environment variables
AWS_ACCESS_KEY_ID
andAWS_SECRET_ACCESS_KEY
- ECS container IAM policy
- EC2 IAM instance profile
- Shared credentials file in your home directory
- Static credentials provided at runtime
You can find out more about credential providers here
Using Soto
To use Soto you need to create an AWSClient
and a service object for the AWS service you want to work with. The AWSClient
provides all the communication with AWS and the service object provides the configuration and APIs for communicating with a specific AWS service. More can be found out about AWSClient
here and the AWS service objects here.
Each Soto command returns a Swift NIO EventLoopFuture
. An EventLoopFuture
is not the response of the command, but rather a container object that will be populated with the response at a later point. In this manner calls to AWS do not block the main thread. It is recommended you familiarise yourself with the Swift NIO documentation, specifically EventLoopFuture if you want to take full advantage of Soto.
The recommended manner to interact with EventLoopFutures
is chaining. The following function returns an EventLoopFuture
that creates an S3 bucket, puts a file in the bucket, reads the file back from the bucket and finally prints the contents of the file. Each of these operations are chained together. The output of one being the input of the next.
import SotoS3 //ensure this module is specified as a dependency in your package.swift
let bucket = "my-bucket"
let client = AWSClient(
credentialProvider: .static(accessKeyId: "Your-Access-Key", secretAccessKey: "Your-Secret-Key"),
httpClientProvider: .createNew
)
let s3 = S3(client: client, region: .uswest2)
func createBucketPutGetObject() -> EventLoopFuture<S3.GetObjectOutput> {
// Create Bucket, Put an Object, Get the Object
let createBucketRequest = S3.CreateBucketRequest(bucket: bucket)
s3.createBucket(createBucketRequest)
.flatMap { response -> EventLoopFuture<S3.PutObjectOutput> in
// Upload text file to the s3
let bodyData = "hello world".data(using: .utf8)!
let putObjectRequest = S3.PutObjectRequest(
acl: .publicRead,
body: bodyData,
bucket: bucket,
key: "hello.txt"
)
return s3.putObject(putObjectRequest)
}
.flatMap { response -> EventLoopFuture<S3.GetObjectOutput> in
let getObjectRequest = S3.GetObjectRequest(bucket: bucket, key: "hello.txt")
return s3.getObject(getObjectRequest)
}
.whenSuccess { response in
if let body = response.body {
print(String(data: body, encoding: .utf8)!)
}
}
}
Documentation
API Reference
Visit soto.codes to browse the user guides and api reference. As there is a one-to-one correspondence with AWS REST api calls and the Soto api calls, you can also use the official AWS documentation for more detailed information about AWS commands.
User guides
Additional user guides for specific elements of Soto are available
- Upgrading to Soto v5
- AWSClient
- AWS Service Objects
- Credential Providers
- Error Handling
- Streaming Payloads
- DynamoDB and Codable
- S3 Multipart Upload
- Using Soto on AWS Lambda
- Using Soto with Vapor 4
Contributing
We welcome and encourage contributions from all developers. Please read CONTRIBUTING.md for our contributing guidelines.
License
Soto is released under the Apache License, Version 2.0. See LICENSE for details.
Backers
Support development of Soto by becoming a backer