From 50eac8b59409f73655fc2b8cf8d783c6347209c3 Mon Sep 17 00:00:00 2001
From: sigoden <sigoden@gmail.com>
Date: Tue, 30 Apr 2024 07:07:09 +0800
Subject: feat: support replicate client (#466)

---
 src/client/replicate.rs | 193 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 src/client/replicate.rs

(limited to 'src/client/replicate.rs')

diff --git a/src/client/replicate.rs b/src/client/replicate.rs
new file mode 100644
index 0000000..e399927
--- /dev/null
+++ b/src/client/replicate.rs
@@ -0,0 +1,193 @@
+use std::time::Duration;
+
+use super::{
+    catch_error, generate_prompt, smart_prompt_format, sse_stream, Client, CompletionDetails,
+    ExtraConfig, Model, ModelConfig, PromptType, ReplicateClient, SendData, SsMmessage, SseHandler,
+};
+
+use crate::utils::PromptKind;
+
+use anyhow::{anyhow, Result};
+use async_trait::async_trait;
+use reqwest::{Client as ReqwestClient, RequestBuilder};
+use serde::Deserialize;
+use serde_json::{json, Value};
+
+const API_BASE: &str = "https://api.replicate.com/v1";
+
+#[derive(Debug, Clone, Deserialize, Default)]
+pub struct ReplicateConfig {
+    pub name: Option<String>,
+    pub api_key: Option<String>,
+    #[serde(default)]
+    pub models: Vec<ModelConfig>,
+    pub extra: Option<ExtraConfig>,
+}
+
+impl ReplicateClient {
+    config_get_fn!(api_key, get_api_key);
+
+    pub const PROMPTS: [PromptType<'static>; 1] =
+        [("api_key", "API Key:", true, PromptKind::String)];
+
+    fn request_builder(
+        &self,
+        client: &ReqwestClient,
+        data: SendData,
+        api_key: &str,
+    ) -> Result<RequestBuilder> {
+        let body = build_body(data, &self.model)?;
+
+        let url = format!("{API_BASE}/models/{}/predictions", self.model.name);
+
+        debug!("Replicate Request: {url} {body}");
+
+        let builder = client.post(url).bearer_auth(api_key).json(&body);
+
+        Ok(builder)
+    }
+}
+
+#[async_trait]
+impl Client for ReplicateClient {
+    client_common_fns!();
+
+    async fn send_message_inner(
+        &self,
+        client: &ReqwestClient,
+        data: SendData,
+    ) -> Result<(String, CompletionDetails)> {
+        let api_key = self.get_api_key()?;
+        let builder = self.request_builder(client, data, &api_key)?;
+        send_message(client, builder, &api_key).await
+    }
+
+    async fn send_message_streaming_inner(
+        &self,
+        client: &ReqwestClient,
+        handler: &mut SseHandler,
+        data: SendData,
+    ) -> Result<()> {
+        let api_key = self.get_api_key()?;
+        let builder = self.request_builder(client, data, &api_key)?;
+        send_message_streaming(client, builder, handler).await
+    }
+}
+
+async fn send_message(
+    client: &ReqwestClient,
+    builder: RequestBuilder,
+    api_key: &str,
+) -> 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())?;
+    }
+    let prediction_url = data["urls"]["get"]
+        .as_str()
+        .ok_or_else(|| anyhow!("Invalid response data: {data}"))?;
+    loop {
+        tokio::time::sleep(Duration::from_millis(500)).await;
+        let prediction_data: Value = client
+            .get(prediction_url)
+            .bearer_auth(api_key)
+            .send()
+            .await?
+            .json()
+            .await?;
+        let err = || anyhow!("Invalid response data: {prediction_data}");
+        let status = prediction_data["status"].as_str().ok_or_else(err)?;
+        if status == "succeeded" {
+            return extract_completion(&prediction_data);
+        } else if status == "failed" || status == "canceled" {
+            return Err(err());
+        }
+    }
+}
+
+async fn send_message_streaming(
+    client: &ReqwestClient,
+    builder: RequestBuilder,
+    handler: &mut SseHandler,
+) -> Result<()> {
+    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())?;
+    }
+    let stream_url = data["urls"]["stream"]
+        .as_str()
+        .ok_or_else(|| anyhow!("Invalid response data: {data}"))?;
+
+    let sse_builder = client.get(stream_url).header("accept", "text/event-stream");
+
+    let handle = |message: SsMmessage| -> Result<bool> {
+        if message.event == "done" {
+            return Ok(true);
+        }
+        handler.text(&message.data)?;
+        Ok(false)
+    };
+    sse_stream(sse_builder, handle).await
+}
+
+fn build_body(data: SendData, model: &Model) -> Result<Value> {
+    let SendData {
+        messages,
+        temperature,
+        top_p,
+        stream,
+    } = data;
+
+    let prompt = generate_prompt(&messages, smart_prompt_format(&model.name))?;
+
+    let mut input = json!({
+        "prompt": prompt,
+        "prompt_template": "{prompt}"
+    });
+
+    if let Some(v) = model.max_output_tokens {
+        input["max_tokens"] = v.into();
+        input["max_new_tokens"] = v.into();
+    }
+    if let Some(v) = temperature {
+        input["temperature"] = v.into();
+    }
+    if let Some(v) = top_p {
+        input["top_p"] = v.into();
+    }
+
+    let mut body = json!({
+        "input": input,
+    });
+
+    if stream {
+        body["stream"] = true.into();
+    }
+
+    Ok(body)
+}
+
+fn extract_completion(data: &Value) -> Result<(String, CompletionDetails)> {
+    let text = data["output"]
+        .as_array()
+        .map(|parts| {
+            parts
+                .iter()
+                .filter_map(|v| v.as_str().map(|v| v.to_string()))
+                .collect::<Vec<String>>()
+                .join("")
+        })
+        .ok_or_else(|| anyhow!("Invalid response data: {data}"))?;
+
+    let details = CompletionDetails {
+        id: data["id"].as_str().map(|v| v.to_string()),
+        input_tokens: data["metrics"]["input_token_count"].as_u64(),
+        output_tokens: data["metrics"]["output_token_count"].as_u64(),
+    };
+
+    Ok((text.to_string(), details))
+}
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