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|
use super::{
json_stream, message::*, patch_system_message, Client, CohereClient, ExtraConfig, Model,
PromptType, ReplyHandler, SendData,
};
use crate::utils::PromptKind;
use anyhow::{bail, Result};
use async_trait::async_trait;
use reqwest::{Client as ReqwestClient, RequestBuilder};
use serde::Deserialize;
use serde_json::{json, Value};
const API_URL: &str = "https://api.cohere.ai/v1/chat";
const MODELS: [(&str, usize, &str); 2] = [
// https://docs.cohere.com/docs/command-r
("command-r", 128000, "text"),
("command-r-plus", 128000, "text"),
];
#[derive(Debug, Clone, Deserialize, Default)]
pub struct CohereConfig {
pub name: Option<String>,
pub api_key: Option<String>,
pub extra: Option<ExtraConfig>,
}
#[async_trait]
impl Client for CohereClient {
client_common_fns!();
async fn send_message_inner(&self, client: &ReqwestClient, data: SendData) -> Result<String> {
let builder = self.request_builder(client, data)?;
send_message(builder).await
}
async fn send_message_streaming_inner(
&self,
client: &ReqwestClient,
handler: &mut ReplyHandler,
data: SendData,
) -> Result<()> {
let builder = self.request_builder(client, data)?;
send_message_streaming(builder, handler).await
}
}
impl CohereClient {
config_get_fn!(api_key, get_api_key);
pub const PROMPTS: [PromptType<'static>; 1] =
[("api_key", "API Key:", false, PromptKind::String)];
pub fn list_models(local_config: &CohereConfig) -> Vec<Model> {
let client_name = Self::name(local_config);
MODELS
.into_iter()
.map(|(name, max_input_tokens, capabilities)| {
Model::new(client_name, name)
.set_capabilities(capabilities.into())
.set_max_input_tokens(Some(max_input_tokens))
})
.collect()
}
fn request_builder(&self, client: &ReqwestClient, data: SendData) -> Result<RequestBuilder> {
let api_key = self.get_api_key().ok();
let body = build_body(data, &self.model)?;
let url = API_URL;
debug!("Cohere Request: {url} {body}");
let mut builder = client.post(url).json(&body);
if let Some(api_key) = api_key {
builder = builder.bearer_auth(api_key);
}
Ok(builder)
}
}
pub(crate) async fn send_message(builder: RequestBuilder) -> Result<String> {
let res = builder.send().await?;
let status = res.status();
let data: Value = res.json().await?;
if status != 200 {
check_error(&data)?;
}
let output = extract_text(&data)?;
Ok(output.to_string())
}
pub(crate) async fn send_message_streaming(
builder: RequestBuilder,
handler: &mut ReplyHandler,
) -> Result<()> {
let res = builder.send().await?;
if res.status() != 200 {
let data: Value = res.json().await?;
check_error(&data)?;
} else {
let handle = |value: &str| -> Result<()> {
let value: Value = serde_json::from_str(value)?;
if let Some("text-generation") = value["event_type"].as_str() {
handler.text(extract_text(&value)?)?;
}
Ok(())
};
json_stream(res.bytes_stream(), handle).await?;
}
Ok(())
}
fn extract_text(data: &Value) -> Result<&str> {
match data["text"].as_str() {
Some(text) => Ok(text),
None => {
bail!("Invalid response data: {data}")
}
}
}
fn check_error(data: &Value) -> Result<()> {
if let Some(message) = data["message"].as_str() {
bail!("{message}");
} else {
bail!("Error {}", data);
}
}
pub(crate) fn build_body(data: SendData, model: &Model) -> Result<Value> {
let SendData {
mut messages,
temperature,
stream,
} = data;
patch_system_message(&mut messages);
let mut image_urls = vec![];
let mut messages: Vec<Value> = messages
.into_iter()
.map(|message| {
let role = match message.role {
MessageRole::User => "USER",
_ => "CHATBOT",
};
match message.content {
MessageContent::Text(text) => json!({
"role": role,
"message": text,
}),
MessageContent::Array(list) => {
let list: Vec<String> = list
.into_iter()
.filter_map(|item| match item {
MessageContentPart::Text { text } => Some(text),
MessageContentPart::ImageUrl {
image_url: ImageUrl { url },
} => {
image_urls.push(url.clone());
None
}
})
.collect();
json!({ "role": role, "message": list.join("\n\n") })
}
}
})
.collect();
if !image_urls.is_empty() {
bail!("The model does not support images: {:?}", image_urls);
}
let message = messages.pop().unwrap();
let message = message["message"].as_str().unwrap_or_default();
let mut body = json!({
"model": &model.name,
"message": message,
});
if let Some(max_tokens) = model.max_output_tokens {
body["max_tokens"] = max_tokens.into();
}
if !messages.is_empty() {
body["chat_history"] = messages.into();
}
if let Some(temperature) = temperature {
body["temperature"] = temperature.into();
}
if stream {
body["stream"] = true.into();
}
Ok(body)
}
|
