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use crate::prelude::*;
use super::*;
use reqwest::Client;
use futures_util::StreamExt;
use tokio::sync::mpsc;
use tokio_stream::wrappers::UnboundedReceiverStream;
// The LM Studio chat
pub struct Chat {
model: Model,
context: Context,
url: String,
client: Client,
reader: Option<ResponseReader>
}
impl Chat {
// Creates new chat
pub fn new<M, C>(model: M, context: C) -> Self
where
M: Into<Model>,
C: Into<Context>
{
Self {
model: model.into(),
context: context.into(),
url: fmt!("http://127.0.0.1:1234/v1/chat/completions"),
client: Client::new(),
reader: None,
}
}
// Allows you to change the default url of any instance
// of the Chat struct
pub fn change_url(&mut self, url: &str) {
self.url = url.to_string();
}
// Send request to chat
pub async fn send(&mut self, mut request: Request) -> Result<Option<Response>> {
// add request to context:
request.messages = if request.context {
for msg in request.messages {
self.context.add(msg);
}
self.context.get()
} else {
let mut context = self.context.clone();
for msg in request.messages {
context.add(msg);
}
context.get()
};
// choose AI model:
if let Model::Custom(s) = &request.model {
if s.is_empty() {
request.model = self.model.clone();
}
}
// send simple request:
if !request.stream {
let response = self.client.post(&self.url)
.json(&request)
.send()
.await?
.error_for_status()?
.json::<Response>()
.await?;
// add response to context:
if request.context {
if let Some(choice) = response.choices.get(0) {
let answer = Message::new(Role::Assistant, choice.message.content.clone());
self.context.add(answer);
}
}
Ok(Some(response))
}
// send request as stream:
else {
// init stream channel:
let (tx, rx) = mpsc::unbounded_channel();
// clone vars:
let client = self.client.clone();
let url = self.url.clone();
let req_clone = request.clone();
// running async task:
tokio::spawn(async move {
let res = client.post(&url)
.json(&req_clone)
.send()
.await;
match res {
Ok(response) => {
let mut stream = response.bytes_stream();
while let Some(item) = stream.next().await {
match item {
Ok(chunk) => {
let chunk_str = String::from_utf8_lossy(&chunk);
for line in chunk_str.lines() {
if line.starts_with("data: ") {
let data = &line[6..];
if data == "[DONE]" {
break;
}
let sr: Result<Stream> = serde_json::from_str(data).map_err(|e| Box::new(e) as Box<dyn std::error::Error>);
if let Ok(sr) = sr {
for choice in sr.choices {
// send choice to channel:
if tx.send(Ok(choice)).is_err() {
// stop stream
break;
}
}
}
}
}
},
Err(e) => {
let _ = tx.send(Err(e));
break;
}
}
}
},
Err(e) => {
let _ = tx.send(Err(e));
}
}
});
self.reader = Some( ResponseReader::new(UnboundedReceiverStream::new(rx), request.context) );
Ok(None)
}
}
// Read next stream choice
pub async fn next(&mut self) -> Option<std::result::Result<String, reqwest::Error>> {
if let Some(reader) = &mut self.reader {
let result = reader.next().await;
if reader.context && reader.is_ready {
self.context.add(reader.message.clone())
}
result
} else {
None
}
}
}