OpenAIKit

OpenAIKit is a Swift package used to communicate with the OpenAI API.

Setup

Add the dependency to Package.swift:

dependencies: [
    ...
    .package(url: "https://github.com/dylanshine/openai-kit.git", from: "1.0.0")
],
targets: [
    .target(name: "App", dependencies: [
        .product(name: "OpenAIKit", package: "openai-kit"),
    ]),

It is encouraged to use environment variables to inject the OpenAI API key, instead of hardcoding it in the source code.

# .env

OPENAI_API_KEY="YOUR-API-KEY"
OPENAI_ORGANIZATION="YOUR-ORGANIZATION"

⚠️ OpenAI strongly recommends developers of client-side applications proxy requests through a separate backend service to keep their API key safe. API keys can access and manipulate customer billing, usage, and organizational data, so it's a significant risk to expose them.

Create a OpenAIKit.Client by passing a configuration.

var apiKey: String {
    ProcessInfo.processInfo.environment["OPENAI_API_KEY"]!
}

var organization: String {
    ProcessInfo.processInfo.environment["OPENAI_ORGANIZATION"]!
}

...

// Generally we would advise on creating a single HTTPClient for the lifecycle of your application and recommend shutting it down on application close.

let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)

let httpClient = HTTPClient(eventLoopGroupProvider: .shared(eventLoopGroup))

defer {
    // it's important to shutdown the httpClient after all requests are done, even if one failed. See: https://github.com/swift-server/async-http-client
    try? httpClient.syncShutdown()
}

let configuration = Configuration(apiKey: apiKey, organization: organization)

let openAIClient = OpenAIKit.Client(httpClient: httpClient, configuration: configuration)

If you don't want to use SwiftNIO you can use URLSession.

let urlSession = URLSession(configuration: .default)
let configuration = Configuration(apiKey: apiKey, organization: organization)
let openAIClient = OpenAIKit.Client(session: urlSession, configuration: configuration)

Using the API

The OpenAIKit.Client implements a handful of methods to interact with the OpenAI API:

import OpenAIKit

let completion = try await openAIClient.completions.create(
    model: Model.GPT3.davinci,
    prompts: ["Write a haiku"]
)

What's Implemented

• Chat
• Models
• Completions
• Edits
• Images
• Embeddings
• Files
• Moderations
• Fine-tunes
• Speech to text
• Function calling

Error handling

If the request to the API failed for any reason an OpenAIKit.APIErrorResponse is thrown. Simply ensure you catch errors thrown like any other throwing function

do {
   ...
} catch let error as APIErrorResponse {
    print(error)
}