mirror of https://github.com/sigoden/aichat
feat: support claude (#278)
sigoden
3 months ago
committed by
GitHub
parent
c73a0acbbc
commit
c538533014
@ -0,0 +1,171 @@
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use super::{
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patch_system_message, ClaudeClient, Client, ExtraConfig, Model, PromptType, SendData,
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TokensCountFactors,
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};
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use crate::{render::ReplyHandler, utils::PromptKind};
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use anyhow::{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 reqwest_eventsource::{Error as EventSourceError, Event, RequestBuilderExt};
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use serde::Deserialize;
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use serde_json::{json, Value};
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const API_BASE: &str = "https://api.anthropic.com/v1/messages";
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const MODELS: [(&str, usize, &str); 3] = [
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("claude-2.1", 204096, "text"),
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("claude-2.0", 104096, "text"),
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("claude-instant-1.2", 104096, "text"),
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];
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const TOKENS_COUNT_FACTORS: TokensCountFactors = (5, 2);
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#[derive(Debug, Clone, Deserialize)]
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pub struct ClaudeConfig {
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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 ClaudeClient {
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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 ClaudeClient {
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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: &ClaudeConfig) -> 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_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_tokens(Some(max_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 body = build_body(data, self.model.name.clone());
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let url = API_BASE;
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debug!("Claude Request: {url} {body}");
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let mut builder = client.post(url).json(&body);
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builder = builder.header("anthropic-version", "2023-06-01");
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if let Some(api_key) = api_key {
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builder = builder.header("x-api-key", api_key)
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}
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Ok(builder)
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}
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}
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async fn send_message(builder: RequestBuilder) -> Result<String> {
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let data: Value = builder.send().await?.json().await?;
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check_error(&data)?;
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let output = data["content"][0]["text"]
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.as_str()
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.ok_or_else(|| anyhow!("Invalid response data: {data}"))?;
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Ok(output.to_string())
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}
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async fn send_message_streaming(builder: RequestBuilder, handler: &mut ReplyHandler) -> Result<()> {
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let mut es = builder.eventsource()?;
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while let Some(event) = es.next().await {
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match event {
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Ok(Event::Open) => {}
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Ok(Event::Message(message)) => {
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let data: Value = serde_json::from_str(&message.data)?;
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check_error(&data)?;
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if let Some(typ) = data["type"].as_str() {
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if typ == "content_block_delta" {
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if let Some(text) = data["delta"]["text"].as_str() {
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handler.text(text)?;
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}
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}
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}
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}
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Err(err) => {
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match err {
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EventSourceError::StreamEnded => {}
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EventSourceError::InvalidStatusCode(code, res) => {
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let data: Value = res.json().await?;
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check_error(&data)?;
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bail!("Invalid status code: {code}");
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}
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_ => {
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bail!("{}", err);
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}
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}
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es.close();
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}
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}
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}
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Ok(())
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}
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fn build_body(data: SendData, model: String) -> 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 body = json!({
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"model": model,
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"max_tokens": 4096,
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"messages": messages,
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});
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if let Some(v) = temperature {
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body["temperature"] = (v / 2.0).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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body
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}
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fn check_error(data: &Value) -> Result<()> {
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if let Some(error) = data["error"].as_object() {
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if let (Some(typ), Some(message)) = (error["type"].as_str(), error["message"].as_str()) {
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bail!("{typ}: {message}");
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} else {
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bail!("{}", Value::Object(error.clone()))
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}
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}
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Ok(())
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}
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