feat: support Qianwen (#211)

2 files changed, 161 insertions, 0 deletions

diff --git a/src/client/mod.rs b/src/client/mod.rs
index ab58056..be29d79 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -18,4 +18,5 @@ register_client!(
     ),
     (palm, "palm", PaLMConfig, PaLMClient),
     (ernie, "ernie", ErnieConfig, ErnieClient),
+    (qianwen, "qianwen", QianwenConfig, QianwenClient),
 );
diff --git a/src/client/qianwen.rs b/src/client/qianwen.rs
new file mode 100644
index 0000000..d5145c2
--- /dev/null
+++ b/src/client/qianwen.rs
@@ -0,0 +1,160 @@
+use super::{QianwenClient, Client, ExtraConfig, PromptType, SendData, Model};
+
+use crate::{
+    config::GlobalConfig,
+    render::ReplyHandler,
+    utils::PromptKind,
+};
+
+use anyhow::{anyhow, bail, Result};
+use async_trait::async_trait;
+use futures_util::StreamExt;
+use reqwest::{Client as ReqwestClient, RequestBuilder};
+use reqwest_eventsource::{Error as EventSourceError, Event, RequestBuilderExt};
+use serde::Deserialize;
+use serde_json::{json, Value};
+
+const API_URL: &str =
+    "https://dashscope.aliyuncs.com/api/v1/services/aigc/text-generation/generation";
+
+const MODELS: [(&str, usize); 2] = [("qwen-turbo", 6144), ("qwen-plus", 6144)];
+
+#[derive(Debug, Clone, Deserialize, Default)]
+pub struct QianwenConfig {
+    pub name: Option<String>,
+    pub api_key: Option<String>,
+    pub extra: Option<ExtraConfig>,
+}
+
+#[async_trait]
+impl Client for QianwenClient {
+    fn config(&self) -> (&GlobalConfig, &Option<ExtraConfig>) {
+        (&self.global_config, &self.config.extra)
+    }
+
+    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 QianwenClient {
+    config_get_fn!(api_key, get_api_key);
+
+    pub const PROMPTS: [PromptType<'static>; 1] =
+        [("api_key", "API Key:", true, PromptKind::String)];
+
+    pub fn list_models(local_config: &QianwenConfig, client_index: usize) -> Vec<Model> {
+        let client_name = Self::name(local_config);
+        MODELS
+            .into_iter()
+            .map(|(name, max_tokens)| Model::new(client_index, client_name, name).set_max_tokens(Some(max_tokens)))
+            .collect()
+    }
+
+    fn request_builder(&self, client: &ReqwestClient, data: SendData) -> Result<RequestBuilder> {
+        let api_key = self.get_api_key()?;
+
+        let stream = data.stream;
+        let body = build_body(data, self.model.llm_name.clone());
+
+        let mut builder = client.post(API_URL).bearer_auth(api_key).json(&body);
+        if stream {
+            builder = builder.header("X-DashScope-SSE", "enable");
+        }
+
+        Ok(builder)
+    }
+}
+
+async fn send_message(builder: RequestBuilder) -> Result<String> {
+    let data: Value = builder.send().await?.json().await?;
+    check_error(&data)?;
+
+    let output = data["output"]["text"].as_str()
+        .ok_or_else(|| anyhow!("Unexpected response {data}"))?;
+
+    Ok(output.to_string())
+}
+
+async fn send_message_streaming(
+    builder: RequestBuilder,
+    handler: &mut ReplyHandler,
+) -> Result<()> {
+    let mut es = builder.eventsource()?;
+    let mut offset = 0;
+
+    while let Some(event) = es.next().await {
+        match event {
+            Ok(Event::Open) => {}
+            Ok(Event::Message(message)) => {
+                let data: Value = serde_json::from_str(&message.data)?;
+                if let Some(text) = data["output"]["text"].as_str() {
+
+                    let text = &text[offset..];
+                    handler.text(text)?;
+                    offset += text.len();
+                }
+            }
+            Err(err) => {
+                match err {
+                    EventSourceError::InvalidStatusCode(_, res) => {
+                        let data: Value = res.json().await?;
+                        check_error(&data)?;
+                        bail!("Request failed");
+                    }
+                    EventSourceError::StreamEnded => {}
+                    _ => {
+                        bail!("{}", err);
+                    }
+                }
+                es.close();
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn check_error(data: &Value) -> Result<()> {
+    if let Some(code) = data["code"].as_str() {
+        if let Some(message) = data["message"].as_str() {
+            bail!("{message}");
+        } else {
+            bail!("{code}");
+        }
+    }
+    Ok(())
+}
+
+fn build_body(data: SendData, model: String) -> Value {
+    let SendData {
+        messages,
+        temperature,
+        stream: _,
+    } = data;
+
+    let mut parameters = json!({});
+
+    if let Some(v) = temperature {
+        parameters["temperature"] = v.into();
+    }
+
+    json!({
+        "model": model,
+        "input": json!({
+            "messages": messages,
+        }),
+        "parameters": parameters
+    })
+}