/
gpt.rs
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/
gpt.rs
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use crate::{get_env, get_env_or, network::*, resp_data, RespData, Result};
use anyhow::{bail, Context};
use async_openai::{
types::{
ChatCompletionRequestMessage, ChatCompletionRequestMessageArgs,
CreateChatCompletionRequest, Role,
},
Client, API_BASE,
};
use futures::StreamExt;
use serde_json::{json, Value};
use tiktoken_rs::{async_openai::num_tokens_from_messages, model::get_context_size};
pub const AUTH_SECRET_KEY: &str = "AUTH_SECRET_KEY";
pub const TIMEOUT_ERROR: &str = "OpenAI timed out waiting for response";
#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Default)]
pub struct RequestContext {
#[serde(skip_serializing_if = "Option::is_none", rename = "conversationId")]
pub conversation_id: Option<String>,
#[serde(skip_serializing_if = "Option::is_none", rename = "parentMessageId")]
parent_message_id: Option<String>,
}
#[derive(serde::Serialize, serde::Deserialize, Debug, Clone)]
pub struct RequestOptions {
#[serde(default, skip_serializing_if = "String::is_empty")]
pub prompt: String,
#[serde(default, rename = "lastContext")]
pub last_context: RequestContext,
#[serde(skip_serializing_if = "Option::is_none", rename = "systemMessage")]
pub system_message: Option<String>,
#[serde(skip_serializing_if = "Option::is_none")]
pub temperature: Option<f32>,
#[serde(skip_serializing_if = "Option::is_none")]
pub top_p: Option<f32>,
}
#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Default)]
pub struct ChatMessage {
#[serde(skip_serializing_if = "Option::is_none")]
role: Option<Role>,
#[serde(default, skip_serializing_if = "String::is_empty")]
id: String,
#[serde(default, skip_serializing_if = "String::is_empty")]
text: String,
#[serde(default, skip_serializing_if = "String::is_empty")]
delta: String,
#[serde(flatten)]
pub last_context: RequestContext,
}
// https://github.com/transitive-bullshit/chatgpt-api#reverse-proxy
// https://github.com/transitive-bullshit/chatgpt-api/blob/07dcc5df31476fb773a46d103136632e12762179/src/chatgpt-unofficial-proxy-api.ts#L174
// https://github.com/Maxuss/chatgpt_rs/blob/cc2b9a56c937d1d5288d7d2507c02d40c83cadbc/src/client.rs#L67
fn get_client(url: &str, key: &str) -> Client {
let mut client = Client::new().with_api_key(key);
if let Some(c) = build_proxy_client() {
client = client.with_http_client(c);
}
if !url.is_empty() {
client = client.with_api_base(url);
}
client
}
fn get_default_client() -> Client {
get_client(&get_url(), &get_key())
}
fn get_request(opt: RequestOptions, stream: Option<bool>) -> Result<CreateChatCompletionRequest> {
log::debug!("Request options: {:?}", opt);
let model = get_model();
let temperature = opt.temperature;
let top_p = opt.temperature;
let (messages, max_tokens, _) = build_messages(&model, opt)?;
log::debug!("Send messages to OpenAI: {:?}", messages);
let req = CreateChatCompletionRequest {
model,
max_tokens: Some(max_tokens as _),
messages,
temperature,
top_p,
stream,
..Default::default()
};
Ok(req)
}
// https://github.com/64bit/async-openai/blob/main/examples/chat-stream/src/main.rs
pub async fn chat_process<F>(
opt: RequestOptions,
on_progress: Option<F>,
) -> Result<RespData<ChatMessage>>
where
F: Fn(ChatMessage),
{
let stream = if on_progress.is_none() {
None
} else {
Some(true)
};
let last_msg = ChatMessage {
id: uuid::Uuid::new_v4().to_string(),
last_context: opt.last_context.clone(),
text: opt.prompt.clone(),
..Default::default()
};
let mut result = ChatMessage {
role: Some(Role::Assistant),
id: uuid::Uuid::new_v4().to_string(),
last_context: RequestContext {
conversation_id: opt.last_context.conversation_id.clone(),
parent_message_id: Some(last_msg.id.clone()),
},
..Default::default()
};
let timeout = get_timeout_ms();
let request = get_request(opt, stream)?;
match on_progress {
Some(on_progress) => {
log::debug!("Start chat stream");
let mut stream =
crate::timeout(timeout, get_default_client().chat().create_stream(request))
.await
.context(TIMEOUT_ERROR)??;
log::debug!("Start chat stream loop");
// https://github.com/64bit/async-openai/blob/f6b04b54d5627a18a1f3c376f878290b92ef571a/examples/chat-stream/src/main.rs#L38
loop {
let _res = crate::timeout(timeout, stream.next()).await?;
match _res {
Some(Ok(resp)) => {
let mut resp = resp;
if !resp.choices.is_empty() {
let delta = resp.choices.drain(..).nth(0).unwrap().delta;
result.delta = delta.content.unwrap_or_default();
let text = result.text;
result.text = "".to_owned(); // saving bandwidth
if delta.role.is_some() {
result.role = delta.role;
}
on_progress(result.clone());
result.text = format!("{}{}", text, result.delta);
}
}
Some(Err(err)) => bail!(err),
None => break,
}
}
}
None => {
// always use the first one: https://github.com/transitive-bullshit/chatgpt-api/blob/bf66500730d0ab4c2388250f3ddac17bf5408df5/src/chatgpt-api.ts#L280
let mut resp = crate::timeout(timeout, get_default_client().chat().create(request))
.await
.context(TIMEOUT_ERROR)??;
if !resp.choices.is_empty() {
let msg = resp.choices.drain(..).nth(0).unwrap();
result.role = Some(msg.message.role);
result.text = msg.message.content;
}
}
}
if put_message(&last_msg).is_ok() {
put_message(&result).ok();
}
Ok(resp_data(result))
}
#[inline]
fn get_timeout_ms() -> u64 {
let i: i32 = get_env("TIMEOUT_MS").parse().unwrap_or(0);
if i <= 0 {
30 * 1000
} else {
i as _
}
}
#[inline]
fn get_key() -> String {
get_env("OPENAI_API_KEY")
}
#[inline]
fn get_model() -> String {
get_env_or("OPENAI_API_MODEL", "gpt-3.5-turbo")
}
fn get_url() -> String {
get_env_or("API_REVERSE_PROXY", get_env("OPENAI_API_BASE_URL"))
}
#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Default)]
pub struct DateRange {
start_date: String,
end_date: String,
}
pub async fn fetch_usage(rng: DateRange) -> Result<String> {
let mut url = get_url();
if url.is_empty() {
url = API_BASE.to_owned();
}
let key = get_key();
let url_usage = format!(
"${url}/dashboard/billing/usage?start_date=${}&end_date=${}",
rng.start_date, rng.end_date
);
let client = build_proxy_client().unwrap_or(reqwest::Client::new());
let res = client
.get(url_usage)
.header("Authorization", format!("Bearer ${key}"))
.header("Content-Type", "application/json")
.send()
.await?;
Ok(res.text().await?)
}
pub async fn chat_config(rng: DateRange, for_web: bool) -> Result<RespData<Value>> {
let usage = fetch_usage(rng).await.unwrap_or_default();
let reverse = get_env("API_REVERSE_PROXY");
let mut proxy = get_env("PROXY");
if for_web {
proxy = remove_auth(proxy);
}
let mut data = json!({
"reverseProxy": reverse,
"proxy": proxy,
"usage": usage,
"timeoutMs": get_timeout_ms(),
});
if !for_web {
data["apiKey"] = json!(get_key());
}
Ok(resp_data(data))
}
// https://github.com/transitive-bullshit/chatgpt-api/blob/bf66500730d0ab4c2388250f3ddac17bf5408df5/src/chatgpt-api.ts#L361
fn build_messages(
model: &str,
opt: RequestOptions,
) -> Result<(Vec<ChatCompletionRequestMessage>, usize, usize)> {
// https://github.com/transitive-bullshit/chatgpt-api/blob/bf66500730d0ab4c2388250f3ddac17bf5408df5/src/chatgpt-api.ts#L44
let max_model_tokens = get_context_size(model);
let max_response_tokens = if model.contains("gpt-4") {
// if use 32k model
if model.contains("32k") {
8192
} else {
2048
}
} else {
// https://github.com/transitive-bullshit/chatgpt-api/blob/bf66500730d0ab4c2388250f3ddac17bf5408df5/src/chatgpt-api.ts#L44
1000
};
let max_num_tokens = max_model_tokens - max_response_tokens;
let mut messages = vec![];
if let Some(msg) = opt.system_message {
messages.push(
ChatCompletionRequestMessageArgs::default()
.content(msg)
.role(Role::System)
.build()?,
);
}
let system_message_offset = messages.len();
let mut next_messages = if !opt.prompt.is_empty() {
messages.push(
ChatCompletionRequestMessageArgs::default()
.content(opt.prompt)
.role(Role::User)
.build()?,
);
messages.clone()
} else {
messages.clone()
};
let mut num_tokens = 0;
let mut parent_message_id = opt.last_context.parent_message_id;
loop {
let next_num_tokens_estimate = num_tokens_from_messages(model, &next_messages)?;
let is_valid_prompt = next_num_tokens_estimate <= max_num_tokens;
if !next_messages.is_empty() && !is_valid_prompt {
break;
}
messages = next_messages.clone();
num_tokens = next_num_tokens_estimate;
if !is_valid_prompt {
break;
}
if parent_message_id.is_none() {
break;
}
match get_message(&parent_message_id.unwrap()) {
None => break,
Some(msg) => {
let role = msg.role.unwrap_or(Role::User);
next_messages.insert(
system_message_offset,
ChatCompletionRequestMessageArgs::default()
.content(msg.text)
.role(role)
.build()?,
);
parent_message_id = msg.last_context.parent_message_id;
}
}
}
let max_tokens = 1.max(max_response_tokens.min(max_model_tokens.saturating_sub(num_tokens)));
Ok((messages, max_tokens, num_tokens))
}
fn get_message(id: &str) -> Option<ChatMessage> {
match crate::store::get(id) {
Ok(Some(data)) => serde_json::from_slice::<ChatMessage>(&data)
.map(|x| Some(x))
.unwrap_or(None),
_ => None,
}
}
fn put_message(msg: &ChatMessage) -> Result<()> {
crate::store::put(&msg.id, serde_json::to_vec(&msg)?)?;
Ok(())
}
pub fn get_session() -> RespData<Value> {
resp_data(
json!({"auth": !get_env(AUTH_SECRET_KEY).is_empty(), "isChatGPTAPI": get_env("API_REVERSE_PROXY").is_empty()}),
)
}
#[derive(serde::Serialize, serde::Deserialize, Debug, Clone, Default)]
pub struct TokenBody {
token: String,
}
pub fn verify(b: TokenBody) -> Result<RespData<Value>> {
if b.token.is_empty() {
bail!("Secret key is empty");
}
let auth = get_env(AUTH_SECRET_KEY);
if auth != b.token {
bail!("Secret key is invalid");
}
Ok(resp_data(Value::Null))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_serialize() {
let msg = ChatMessage::default();
let res = serde_json::to_string(&msg);
assert!(res.is_ok());
let res = res.unwrap();
assert!(!res.contains("id"));
assert!(!res.contains("role"));
let msg = serde_json::from_str::<ChatMessage>(&res);
assert!(msg.is_ok());
}
}