feat: support reka client (#614)

1 files changed, 126 insertions, 0 deletions

diff --git a/src/client/reka.rs b/src/client/reka.rs
new file mode 100644
index 0000000..46f9118
--- /dev/null
+++ b/src/client/reka.rs
@@ -0,0 +1,126 @@
+use super::*;
+
+use anyhow::{anyhow, Result};
+use reqwest::{Client as ReqwestClient, RequestBuilder};
+use serde::Deserialize;
+use serde_json::{json, Value};
+
+const CHAT_COMPLETIONS_API_URL: &str = "https://api.reka.ai/v1/chat";
+
+#[derive(Debug, Clone, Deserialize, Default)]
+pub struct RekaConfig {
+    pub name: Option<String>,
+    pub api_key: Option<String>,
+    #[serde(default)]
+    pub models: Vec<ModelData>,
+    pub patches: Option<ModelPatches>,
+    pub extra: Option<ExtraConfig>,
+}
+
+impl RekaClient {
+    config_get_fn!(api_key, get_api_key);
+
+    pub const PROMPTS: [PromptAction<'static>; 1] =
+        [("api_key", "API Key:", true, PromptKind::String)];
+
+    fn chat_completions_builder(
+        &self,
+        client: &ReqwestClient,
+        data: ChatCompletionsData,
+    ) -> Result<RequestBuilder> {
+        let api_key = self.get_api_key()?;
+
+        let mut body = build_chat_completions_body(data, &self.model);
+        self.patch_chat_completions_body(&mut body);
+
+        let url = CHAT_COMPLETIONS_API_URL;
+
+        debug!("Reka Chat Completions Request: {url} {body}");
+
+        let builder = client.post(url).header("x-api-key", api_key).json(&body);
+
+        Ok(builder)
+    }
+}
+
+impl_client_trait!(
+    RekaClient,
+    chat_completions,
+    chat_completions_streaming
+);
+
+async fn chat_completions(builder: RequestBuilder) -> Result<ChatCompletionsOutput> {
+    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())?;
+    }
+
+    debug!("non-stream-data: {data}");
+    extract_chat_completions(&data)
+}
+
+async fn chat_completions_streaming(
+    builder: RequestBuilder,
+    handler: &mut SseHandler,
+) -> Result<()> {
+    let mut prev_text = String::new();
+    let handle = |message: SseMmessage| -> Result<bool> {
+        let data: Value = serde_json::from_str(&message.data)?;
+        debug!("stream-data: {data}");
+        if let Some(text) = data["responses"][0]["chunk"]["content"].as_str() {
+            let delta_text = &text[prev_text.len()..];
+            prev_text = text.to_string();
+            handler.text(delta_text)?;
+        }
+        Ok(false)
+    };
+
+    sse_stream(builder, handle).await
+}
+
+fn build_chat_completions_body(data: ChatCompletionsData, model: &Model) -> Value {
+    let ChatCompletionsData {
+        mut messages,
+        temperature,
+        top_p,
+        functions: _,
+        stream,
+    } = data;
+
+    patch_system_message(&mut messages);
+
+    let mut body = json!({
+        "model": &model.name(),
+        "messages": messages,
+    });
+
+    if let Some(v) = model.max_tokens_param() {
+        body["max_tokens"] = v.into();
+    }
+    if let Some(v) = temperature {
+        body["temperature"] = v.into();
+    }
+    if let Some(v) = top_p {
+        body["top_p"] = v.into();
+    }
+    if stream {
+        body["stream"] = true.into();
+    }
+
+    body
+}
+
+fn extract_chat_completions(data: &Value) -> Result<ChatCompletionsOutput> {
+    let text = data["responses"][0]["message"]["content"].as_str().ok_or_else(|| anyhow!("Invalid response data: {data}"))?;
+
+    let output = ChatCompletionsOutput {
+        text: text.to_string(),
+        tool_calls: vec![],
+        id: data["id"].as_str().map(|v| v.to_string()),
+        input_tokens: data["usage"]["input_tokens"].as_u64(),
+        output_tokens: data["usage"]["output_tokens"].as_u64(),
+    };
+    Ok(output)
+}