rust-genai/examples/c02-auth.rs

use genai::adapter::{AdapterConfig, AdapterKind};
use genai::chat::{ChatMessage, ChatRequest};
use genai::resolver::{AuthData, AuthResolver};
use genai::utils::print_chat_stream;
use genai::Client;
use genai::ConfigSet;

const MODEL: &str = "gpt-4o-mini";

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
	let questions = &[
		// follow-up questions
		"Why is the sky blue?",
		"Why is it red sometime?",
	];

	// -- Build a auth_resolver and the AdapterConfig
	let auth_resolver = AuthResolver::from_sync_resolver(
		|kind: AdapterKind, _config_set: &ConfigSet<'_>| -> Result<Option<AuthData>, genai::resolver::Error> {
			println!("\n>> Custom auth provider for {kind} <<");
			let key = std::env::var("OPENAI_API_KEY").map_err(|_| genai::resolver::Error::ApiKeyEnvNotFound {
				env_name: "OPENAI_API_KEY".to_string(),
			})?;
			Ok(Some(AuthData::from_single(key)))
		},
	);
	let adapter_config = AdapterConfig::default().with_auth_resolver(auth_resolver);

	// -- Build the new client with this adapter_config
	let client = Client::builder()
		.with_adapter_config(AdapterKind::OpenAI, adapter_config)
		.build();

	let mut chat_req = ChatRequest::default().with_system("Answer in one sentence");

	for &question in questions {
		chat_req = chat_req.append_message(ChatMessage::user(question));

		println!("\n--- Question:\n{question}");
		let chat_res = client.exec_chat_stream(MODEL, chat_req.clone(), None).await?;

		println!("\n--- Answer: (streaming)");
		let assistant_answer = print_chat_stream(chat_res, None).await?;

		chat_req = chat_req.append_message(ChatMessage::assistant(assistant_answer));
	}

	Ok(())
}