mirror of https://github.com/sigoden/aichat
feat: support cohere (#397)
sigoden
2 months ago
committed by
GitHub
parent
ce1f9929f2
commit
5915bc2f3a
@ -0,0 +1,244 @@
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use super::{
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message::*, patch_system_message, Client, CohereClient, ExtraConfig, Model, PromptType,
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SendData, TokensCountFactors,
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};
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use crate::{render::ReplyHandler, utils::PromptKind};
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use anyhow::{bail, Result};
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use async_trait::async_trait;
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use futures_util::StreamExt;
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use reqwest::{Client as ReqwestClient, RequestBuilder};
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use serde::Deserialize;
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use serde_json::{json, Value};
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const API_URL: &str = "https://api.cohere.ai/v1/chat";
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const MODELS: [(&str, usize, &str); 2] = [
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// https://docs.cohere.com/docs/command-r
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("command-r", 128000, "text"),
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("command-r-plus", 128000, "text"),
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];
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const TOKENS_COUNT_FACTORS: TokensCountFactors = (5, 2);
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#[derive(Debug, Clone, Deserialize, Default)]
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pub struct CohereConfig {
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pub name: Option<String>,
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pub api_key: Option<String>,
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pub extra: Option<ExtraConfig>,
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}
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#[async_trait]
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impl Client for CohereClient {
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client_common_fns!();
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async fn send_message_inner(&self, client: &ReqwestClient, data: SendData) -> Result<String> {
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let builder = self.request_builder(client, data)?;
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send_message(builder).await
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}
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async fn send_message_streaming_inner(
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&self,
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client: &ReqwestClient,
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handler: &mut ReplyHandler,
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data: SendData,
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) -> Result<()> {
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let builder = self.request_builder(client, data)?;
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send_message_streaming(builder, handler).await
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}
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}
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impl CohereClient {
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config_get_fn!(api_key, get_api_key);
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pub const PROMPTS: [PromptType<'static>; 1] =
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[("api_key", "API Key:", false, PromptKind::String)];
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pub fn list_models(local_config: &CohereConfig) -> Vec<Model> {
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let client_name = Self::name(local_config);
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MODELS
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.into_iter()
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.map(|(name, max_input_tokens, capabilities)| {
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Model::new(client_name, name)
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.set_capabilities(capabilities.into())
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.set_max_input_tokens(Some(max_input_tokens))
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.set_tokens_count_factors(TOKENS_COUNT_FACTORS)
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})
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.collect()
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}
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fn request_builder(&self, client: &ReqwestClient, data: SendData) -> Result<RequestBuilder> {
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let api_key = self.get_api_key().ok();
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let mut body = build_body(data, self.model.name.clone())?;
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self.model.merge_extra_fields(&mut body);
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let url = API_URL;
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debug!("Cohere Request: {url} {body}");
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let mut builder = client.post(url).json(&body);
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if let Some(api_key) = api_key {
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builder = builder.bearer_auth(api_key);
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}
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Ok(builder)
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}
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}
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pub(crate) async fn send_message(builder: RequestBuilder) -> Result<String> {
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let res = builder.send().await?;
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let status = res.status();
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let data: Value = res.json().await?;
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if status != 200 {
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check_error(&data)?;
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}
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let output = extract_text(&data)?;
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Ok(output.to_string())
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}
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pub(crate) async fn send_message_streaming(
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builder: RequestBuilder,
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handler: &mut ReplyHandler,
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) -> Result<()> {
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let res = builder.send().await?;
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if res.status() != 200 {
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let data: Value = res.json().await?;
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check_error(&data)?;
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} else {
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let mut buffer = vec![];
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let mut cursor = 0;
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let mut start = 0;
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let mut balances = vec![];
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let mut quoting = false;
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let mut stream = res.bytes_stream();
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while let Some(chunk) = stream.next().await {
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let chunk = chunk?;
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let chunk = std::str::from_utf8(&chunk)?;
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buffer.extend(chunk.chars());
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for i in cursor..buffer.len() {
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let ch = buffer[i];
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if quoting {
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if ch == '"' && buffer[i - 1] != '\\' {
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quoting = false;
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}
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continue;
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}
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match ch {
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'"' => quoting = true,
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'{' => {
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if balances.is_empty() {
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start = i;
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}
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balances.push(ch);
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}
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'[' => {
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if start != 0 {
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balances.push(ch);
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}
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}
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'}' => {
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balances.pop();
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if balances.is_empty() {
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let value: String = buffer[start..=i].iter().collect();
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let value: Value = serde_json::from_str(&value)?;
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if let Some("text-generation") = value["event_type"].as_str() {
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handler.text(extract_text(&value)?)?;
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}
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}
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}
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']' => {
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balances.pop();
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}
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_ => {}
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}
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}
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cursor = buffer.len();
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}
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}
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Ok(())
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}
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fn extract_text(data: &Value) -> Result<&str> {
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match data["text"].as_str() {
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Some(text) => Ok(text),
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None => {
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bail!("Invalid response data: {data}")
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}
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}
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}
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fn check_error(data: &Value) -> Result<()> {
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if let Some(message) = data["message"].as_str() {
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bail!("{message}");
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} else {
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bail!("Error {}", data);
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}
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}
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pub(crate) fn build_body(data: SendData, model: String) -> Result<Value> {
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let SendData {
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mut messages,
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temperature,
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stream,
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} = data;
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patch_system_message(&mut messages);
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let mut image_urls = vec![];
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let mut messages: Vec<Value> = messages
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.into_iter()
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.map(|message| {
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let role = match message.role {
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MessageRole::User => "USER",
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_ => "CHATBOT",
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};
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match message.content {
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MessageContent::Text(text) => json!({
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"role": role,
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"message": text,
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}),
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MessageContent::Array(list) => {
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let list: Vec<String> = list
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.into_iter()
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.filter_map(|item| match item {
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MessageContentPart::Text { text } => Some(text),
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MessageContentPart::ImageUrl {
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image_url: ImageUrl { url },
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} => {
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image_urls.push(url.clone());
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None
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}
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})
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.collect();
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json!({ "role": role, "message": list.join("\n\n") })
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}
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}
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})
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.collect();
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if !image_urls.is_empty() {
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bail!("The model does not support images: {:?}", image_urls);
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}
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let message = messages.pop().unwrap();
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let message = message["message"].as_str().unwrap_or_default();
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let mut body = json!({
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"model": model,
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"message": message,
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});
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if !messages.is_empty() {
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body["chat_history"] = messages.into();
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}
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if let Some(temperature) = temperature {
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body["temperature"] = temperature.into();
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}
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if stream {
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body["stream"] = true.into();
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}
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Ok(body)
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}
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