mirror of https://github.com/sigoden/aichat
feat: serve all LLMs as OpenAI-compatible API (#431)
sigoden
2 weeks ago
committed by
GitHub
parent
9c6c9f10a2
commit
0a4c0413ef
@ -0,0 +1,40 @@
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use crate::config::WorkingMode;
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use anyhow::Result;
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use log::LevelFilter;
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use simplelog::{format_description, Config as LogConfig, ConfigBuilder};
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#[cfg(debug_assertions)]
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pub fn setup_logger(working_mode: WorkingMode) -> Result<()> {
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let config = build_config();
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if working_mode == WorkingMode::Serve {
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simplelog::SimpleLogger::init(LevelFilter::Debug, config)?;
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} else {
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let file = std::fs::File::create(crate::config::Config::local_path("debug.log")?)?;
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simplelog::WriteLogger::init(LevelFilter::Debug, config, file)?;
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}
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Ok(())
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}
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#[cfg(not(debug_assertions))]
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pub fn setup_logger(working_mode: WorkingMode) -> Result<()> {
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let config = build_config();
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if working_mode == WorkingMode::Serve {
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simplelog::SimpleLogger::init(log::LevelFilter::Info, config)?;
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}
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Ok(())
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}
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fn build_config() -> LogConfig {
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let log_filter = match std::env::var("AICHAT_LOG_FILTER") {
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Ok(v) => v,
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Err(_) => "aichat".into(),
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};
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ConfigBuilder::new()
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.add_filter_allow(log_filter)
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.set_time_format_custom(format_description!(
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"[year]-[month]-[day]T[hour]:[minute]:[second].[subsecond digits:3]Z"
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))
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.set_thread_level(LevelFilter::Off)
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.build()
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}
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@ -0,0 +1,364 @@
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use crate::{
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client::{init_client, ClientConfig, Message, Model, ReplyEvent, ReplyHandler, SendData},
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config::{Config, GlobalConfig},
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utils::create_abort_signal,
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};
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use anyhow::{anyhow, bail, Result};
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use bytes::Bytes;
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use chrono::{Timelike, Utc};
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use futures_util::StreamExt;
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use http::{Method, Response, StatusCode};
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use http_body_util::{combinators::BoxBody, BodyExt, Full, StreamBody};
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use hyper::{
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body::{Frame, Incoming},
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service::service_fn,
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};
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use hyper_util::rt::{TokioExecutor, TokioIo};
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use parking_lot::RwLock;
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use serde::Deserialize;
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use serde_json::{json, Value};
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use std::{convert::Infallible, sync::Arc};
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use tokio::{
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net::TcpListener,
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sync::{
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mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender},
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oneshot,
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},
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};
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use tokio_graceful::Shutdown;
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use tokio_stream::wrappers::UnboundedReceiverStream;
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const DEFAULT_ADDRESS: &str = "0.0.0.0:8080";
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type AppResponse = Response<BoxBody<Bytes, Infallible>>;
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pub async fn run(config: GlobalConfig, addr: Option<String>) -> Result<()> {
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let addr = match addr {
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Some(addr) => {
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if let Ok(port) = addr.parse::<u16>() {
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format!("0.0.0.0:{port}")
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} else {
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addr
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}
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}
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None => DEFAULT_ADDRESS.to_string(),
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};
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let clients = config.read().clients.clone();
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let model = config.read().model.clone();
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let listener = TcpListener::bind(&addr).await?;
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let server = Arc::new(Server { clients, model });
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let stop_server = server.run(listener).await?;
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println!("Access the chat completion API at: http://{addr}/v1/chat/completions");
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shutdown_signal().await;
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let _ = stop_server.send(());
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Ok(())
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}
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struct Server {
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clients: Vec<ClientConfig>,
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model: Model,
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}
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impl Server {
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async fn run(self: Arc<Self>, listener: TcpListener) -> Result<oneshot::Sender<()>> {
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let (tx, rx) = oneshot::channel();
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tokio::spawn(async move {
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let shutdown = Shutdown::new(async { rx.await.unwrap_or_default() });
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let guard = shutdown.guard_weak();
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loop {
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tokio::select! {
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res = listener.accept() => {
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let Ok((cnx, _)) = res else {
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continue;
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};
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let stream = TokioIo::new(cnx);
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let server = self.clone();
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shutdown.spawn_task(async move {
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let hyper_service = service_fn(move |request: hyper::Request<Incoming>| {
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server.clone().handle(request)
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});
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let _ = hyper_util::server::conn::auto::Builder::new(TokioExecutor::new())
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.serve_connection_with_upgrades(stream, hyper_service)
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.await;
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});
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}
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_ = guard.cancelled() => {
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break;
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}
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}
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}
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});
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Ok(tx)
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}
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async fn handle(
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self: Arc<Self>,
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req: hyper::Request<Incoming>,
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) -> std::result::Result<AppResponse, hyper::Error> {
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let method = req.method().clone();
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let uri = req.uri().clone();
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let mut status = StatusCode::OK;
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let res = if method == Method::POST && uri == "/v1/chat/completions" {
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self.chat_completion(req).await
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} else if method == Method::OPTIONS && uri == "/v1/chat/completions" {
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status = StatusCode::NO_CONTENT;
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Ok(Response::default())
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} else {
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status = StatusCode::NOT_FOUND;
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Err(anyhow!("The requested endpoint was not found."))
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};
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let mut res = match res {
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Ok(res) => {
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info!("{method} {uri} {}", status.as_u16());
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res
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}
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Err(err) => {
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error!("{method} {uri} {} {err}", status.as_u16());
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ret_err(err)
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}
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};
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*res.status_mut() = status;
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set_cors_header(&mut res);
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Ok(res)
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}
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async fn chat_completion(&self, req: hyper::Request<Incoming>) -> Result<AppResponse> {
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let req_body = req.collect().await?.to_bytes();
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let req_body: ChatCompletionReqBody = serde_json::from_slice(&req_body)
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.map_err(|err| anyhow!("Invalid request body, {err}"))?;
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let ChatCompletionReqBody {
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model,
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messages,
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temperature,
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max_tokens,
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stream,
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} = req_body;
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let config = Config {
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clients: self.clients.to_vec(),
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model: self.model.clone(),
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..Default::default()
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};
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let config = Arc::new(RwLock::new(config));
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if model != "default" && model != self.model.id() {
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config.write().set_model(&model)?;
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}
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let mut client = init_client(&config)?;
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if max_tokens.is_some() {
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client.set_model(client.model().clone().set_max_output_tokens(max_tokens));
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}
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let abort = create_abort_signal();
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let http_client = client.build_client()?;
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let completion_id = generate_completion_id();
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let created = Utc::now().timestamp();
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let send_data: SendData = SendData {
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messages,
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temperature,
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stream,
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};
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if stream {
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let (tx, mut rx) = unbounded_channel();
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tokio::spawn(async move {
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let mut is_first = true;
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let (tx2, rx2) = unbounded_channel();
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let mut handler = ReplyHandler::new(tx2, abort);
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async fn map_event(
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mut rx: UnboundedReceiver<ReplyEvent>,
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tx: &UnboundedSender<ResEvent>,
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is_first: &mut bool,
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) {
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while let Some(reply_event) = rx.recv().await {
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if *is_first {
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let _ = tx.send(ResEvent::First(None));
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*is_first = false;
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}
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match reply_event {
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ReplyEvent::Text(text) => {
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let _ = tx.send(ResEvent::Text(text));
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}
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ReplyEvent::Done => {
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let _ = tx.send(ResEvent::Done);
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}
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}
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}
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}
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tokio::select! {
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_ = map_event(rx2, &tx, &mut is_first) => {}
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ret = client.send_message_streaming_inner(&http_client, &mut handler, send_data) => {
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if let Err(err) = ret {
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send_first_event(&tx, Some(format!("{err:?}")), &mut is_first)
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}
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}
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}
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});
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let first_event = rx.recv().await;
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if let Some(ResEvent::First(Some(err))) = first_event {
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bail!("{err}");
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}
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let shared: Arc<(String, i64)> = Arc::new((completion_id, created));
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let stream = UnboundedReceiverStream::new(rx);
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let stream = stream.filter_map(move |res_event| {
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let shared = shared.clone();
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async move {
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match res_event {
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ResEvent::Text(text) => {
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Some(Ok(create_frame(&shared.0, shared.1, &text, false)))
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}
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ResEvent::Done => Some(Ok(create_frame(&shared.0, shared.1, "", true))),
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_ => None,
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}
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}
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});
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let res = Response::builder()
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.status(StatusCode::OK)
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.header("Content-Type", "text/event-stream")
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.header("Cache-Control", "no-cache")
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.header("Connection", "keep-alive")
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.body(BodyExt::boxed(StreamBody::new(stream)))?;
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Ok(res)
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} else {
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let content = client.send_message_inner(&http_client, send_data).await?;
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let res = Response::builder()
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.header("Content-Type", "application/json")
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.body(Full::new(ret_non_stream(&completion_id, created, &content)).boxed())?;
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Ok(res)
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}
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}
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}
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#[derive(Debug, Deserialize)]
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struct ChatCompletionReqBody {
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model: String,
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messages: Vec<Message>,
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temperature: Option<f64>,
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max_tokens: Option<isize>,
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#[serde(default)]
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stream: bool,
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}
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#[derive(Debug)]
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enum ResEvent {
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First(Option<String>),
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Text(String),
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Done,
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}
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fn send_first_event(tx: &UnboundedSender<ResEvent>, data: Option<String>, is_first: &mut bool) {
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if *is_first {
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let _ = tx.send(ResEvent::First(data));
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*is_first = false;
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}
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}
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async fn shutdown_signal() {
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tokio::signal::ctrl_c()
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.await
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.expect("Failed to install CTRL+C signal handler")
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}
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fn generate_completion_id() -> String {
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let random_id = chrono::Utc::now().nanosecond();
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format!("chatcmpl-{}", random_id)
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}
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fn set_cors_header(res: &mut AppResponse) {
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res.headers_mut().insert(
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hyper::header::ACCESS_CONTROL_ALLOW_ORIGIN,
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hyper::header::HeaderValue::from_static("*"),
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);
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res.headers_mut().insert(
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hyper::header::ACCESS_CONTROL_ALLOW_METHODS,
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hyper::header::HeaderValue::from_static("GET,POST,PUT,PATCH,DELETE"),
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);
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res.headers_mut().insert(
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hyper::header::ACCESS_CONTROL_ALLOW_HEADERS,
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hyper::header::HeaderValue::from_static("Content-Type,Authorization"),
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);
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}
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fn create_frame(id: &str, created: i64, content: &str, done: bool) -> Frame<Bytes> {
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let (delta, finish_reason) = if done {
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(json!({}), "stop".into())
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} else {
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let delta = if content.is_empty() {
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json!({ "role": "assistant", "content": content })
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} else {
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json!({ "content": content })
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};
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(delta, Value::Null)
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};
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let mut value = json!({
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"id": id,
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"object": "chat.completion.chunk",
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"created": created,
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"model": "gpt-3.5-turbo",
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"choices": [
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{
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"index": 0,
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"delta": delta,
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"finish_reason": finish_reason,
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},
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],
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});
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let output = if done {
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value["usage"] = json!({
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"prompt_tokens": 0,
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"completion_tokens": 0,
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"total_tokens": 0,
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});
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format!("data: {value}\n\ndata: [DONE]\n\n")
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} else {
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format!("data: {value}\n\n")
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};
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Frame::data(Bytes::from(output))
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}
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fn ret_non_stream(id: &str, created: i64, content: &str) -> Bytes {
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let res_body = json!({
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"id": id,
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"object": "chat.completion",
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"created": created,
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"model": "gpt-3.5-turbo",
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"choices": [
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{
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"index": 0,
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"message": {
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"role": "assistant",
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"content": content,
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},
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"finish_reason": "stop",
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},
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],
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"usage": {
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"prompt_tokens": 0,
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"completion_tokens": 0,
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"total_tokens": 0,
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},
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});
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Bytes::from(res_body.to_string())
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}
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fn ret_err<T: std::fmt::Display>(err: T) -> AppResponse {
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let data = json!({
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"error": {
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"message": err.to_string(),
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"type": "invalid_request_error",
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},
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});
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Response::builder()
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.status(StatusCode::OK)
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.header("Content-Type", "application/json")
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.body(Full::new(Bytes::from(data.to_string())).boxed())
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.unwrap()
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}
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