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|
use super::{
catch_error, extract_system_message, json_stream, message::*, CohereClient, CompletionDetails,
ExtraConfig, Model, ModelConfig, PromptAction, PromptKind, SendData, SseHandler,
};
use anyhow::{anyhow, bail, Result};
use reqwest::{Client as ReqwestClient, RequestBuilder};
use serde::Deserialize;
use serde_json::{json, Value};
const API_URL: &str = "https://api.cohere.ai/v1/chat";
#[derive(Debug, Clone, Deserialize, Default)]
pub struct CohereConfig {
pub name: Option<String>,
pub api_key: Option<String>,
#[serde(default)]
pub models: Vec<ModelConfig>,
pub extra: Option<ExtraConfig>,
}
impl CohereClient {
config_get_fn!(api_key, get_api_key);
pub const PROMPTS: [PromptAction<'static>; 1] =
[("api_key", "API Key:", true, PromptKind::String)];
fn request_builder(&self, client: &ReqwestClient, data: SendData) -> Result<RequestBuilder> {
let api_key = self.get_api_key()?;
let body = build_body(data, &self.model)?;
let url = API_URL;
debug!("Cohere Request: {url} {body}");
let builder = client.post(url).bearer_auth(api_key).json(&body);
Ok(builder)
}
}
impl_client_trait!(CohereClient, send_message, send_message_streaming);
async fn send_message(builder: RequestBuilder) -> Result<(String, CompletionDetails)> {
let res = builder.send().await?;
let status = res.status();
let data: Value = res.json().await?;
if !status.is_success() {
catch_error(&data, status.as_u16())?;
}
extract_completion(&data)
}
async fn send_message_streaming(builder: RequestBuilder, handler: &mut SseHandler) -> Result<()> {
let res = builder.send().await?;
let status = res.status();
if !status.is_success() {
let data: Value = res.json().await?;
catch_error(&data, status.as_u16())?;
} else {
let handle = |data: &str| -> Result<()> {
let data: Value = serde_json::from_str(data)?;
if let Some("text-generation") = data["event_type"].as_str() {
if let Some(text) = data["text"].as_str() {
handler.text(text)?;
}
}
Ok(())
};
json_stream(res.bytes_stream(), handle).await?;
}
Ok(())
}
fn build_body(data: SendData, model: &Model) -> Result<Value> {
let SendData {
mut messages,
temperature,
top_p,
stream,
} = data;
let system_message = extract_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(v) = system_message {
body["preamble"] = v.into();
}
if !messages.is_empty() {
body["chat_history"] = messages.into();
}
if let Some(v) = model.max_output_tokens {
body["max_tokens"] = v.into();
}
if let Some(v) = temperature {
body["temperature"] = v.into();
}
if let Some(v) = top_p {
body["p"] = v.into();
}
if stream {
body["stream"] = true.into();
}
Ok(body)
}
fn extract_completion(data: &Value) -> Result<(String, CompletionDetails)> {
let text = data["text"]
.as_str()
.ok_or_else(|| anyhow!("Invalid response data: {data}"))?;
let details = CompletionDetails {
id: data["generation_id"].as_str().map(|v| v.to_string()),
input_tokens: data["meta"]["billed_units"]["input_tokens"].as_u64(),
output_tokens: data["meta"]["billed_units"]["output_tokens"].as_u64(),
};
Ok((text.to_string(), details))
}
|
