genai - Multi-AI Providers Library for Rust.

Currently supports natively: Ollama, OpenAI, Gemini, Anthropic, Cohere (more to come)

# cargo.toml
genai = "=0.1.1" # Version lock for `0.1.x`

The goal of this library is to provide a common and ergonomic single API to many generative AI Providers, such as OpenAI, Anthropic, Cohere, Ollama.

• IMPORTANT 1 0.1.x will still have some breaking changes in patches, so make sure to lock your version, e.g., genai = "=0.1.0". In short, 0.1.x can be considered "beta releases."

• IMPORTANT 2 This is NOT intended to be a replacement for async-openai and ollama-rs, but rather to tackle the simpler lowest common denominator of chat generation use cases, where API depth is less aa priority than API commonality.

Library Focus:

• Focuses on standardizing chat completion APIs across major AI Services.

• Native implementation, meaning no per-service SDKs.

  • Reason: While there are some variations between all of the various APIs, they all follow the same pattern and high-level flow and constructs. Managing the differences at a lower layer is actually simpler and more cumulative accross services than doing sdks gymnastic.

• Prioritizes ergonomics and commonality, with depth being secondary. (If you require complete client API, consider using async-openai and ollama-rs; they are both excellent and easy to use.)

• Initially, this library will mostly focus on text chat API (images, or even function calling in the first stage).

• The 0.1.x version will work, but the APIs will change in the patch version, not following semver strictly.

• Version 0.2.x will follow semver more strictly.

Example

examples/c00-readme.rs

use genai::chat::{ChatMessage, ChatRequest};
use genai::client::Client;
use genai::utils::{print_chat_stream, PrintChatStreamOptions};

const MODEL_OPENAI: &str = "gpt-3.5-turbo";
const MODEL_ANTHROPIC: &str = "claude-3-haiku-20240307";
const MODEL_COHERE: &str = "command-light";
const MODEL_GEMINI: &str = "gemini-1.5-flash-latest";
const MODEL_OLLAMA: &str = "mixtral";

// NOTE: Those are the default env keys for each AI Provider type.
const MODEL_AND_KEY_ENV_NAME_LIST: &[(&str, &str)] = &[
	// -- de/activate models/providers
	(MODEL_OPENAI, "OPENAI_API_KEY"),
	(MODEL_ANTHROPIC, "ANTHROPIC_API_KEY"),
	(MODEL_COHERE, "COHERE_API_KEY"),
	(MODEL_GEMINI, "GEMINI_API_KEY"),
	(MODEL_OLLAMA, ""),
];

// NOTE: Model to AdapterKind (AI Provider) type mapping rule
//  - starts_with "gpt"      -> OpenAI
//  - starts_with "claude"   -> Anthropic
//  - starts_with "command"  -> Cohere
//  - starts_with "gemini"   -> Gemini
//  - For anything else      -> Ollama
//
// Refined mapping rules will be added later and extended as provider support grows.

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
	let question = "Why is the sky red?";

	let chat_req = ChatRequest::new(vec![
		// -- Messages (de/activate to see the differences)
		// ChatMessage::system("Answer in one sentence"),
		ChatMessage::user(question),
	]);

	let client = Client::default();

	let print_options = PrintChatStreamOptions::from_stream_events(true);

	for (model, env_name) in MODEL_AND_KEY_ENV_NAME_LIST {
		// Skip if does not have the environment name set
		if !env_name.is_empty() && std::env::var(env_name).is_err() {
			continue;
		}

		println!("\n===== MODEL: {model} =====");

		println!("\n--- Question:\n{question}");

		println!("\n--- Answer: (oneshot response)");
		let chat_res = client.exec_chat(model, chat_req.clone(), None).await?;
		println!("{}", chat_res.content.as_deref().unwrap_or("NO ANSWER"));

		println!("\n--- Answer: (streaming)");
		let chat_res = client.exec_chat_stream(model, chat_req.clone(), None).await?;
		print_chat_stream(chat_res, Some(&print_options)).await?;

		println!();
	}

	Ok(())
}

Examples:

• examples/c00-readme.rs - Quick overview code with multiple providers and streaming.
• examples/c01-conv.rs - Shows how to build a conversation flow.
• examples/c02-auth.rs - Demonstrates how to provide a custom AuthResolver to provide auth data (i.e., for api_key) per adapter kind.
• examples/c03-kind.rs - Demonstrates how to provide a custom AdapterKindResolver to customize the "model name" to "adapter kind" mapping.

Notes on Possible Direction

• Will add more data on ChatResponse and ChatStream, especially metadata about usage.
• Add vision/image support to chat messages and responses.
• Add function calling support to chat messages and responses.
• Add embbed and embbed_batch
• Add the AWS Bedrock variants (e.g., Mistral, and Anthropic). Most of the work will be on "interesting" token signature scheme (without having to drag big SDKs, might be below feature).
• Add the Google VertexAI variants.
• (might) add the Azure OpenAI variant (not sure yet).

Links

• crates.io: crates.io/crates/genai
• GitHub: github.com/jeremychone/rust-genai
• Sponsored by BriteSnow (Jeremy Chones's consulting company)