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//! OpenRouter provider implementation.
//!
//! OpenRouter is a unified API gateway for multiple LLM providers, allowing
//! access to models from OpenAI, Anthropic, Google, Meta, and others through
//! a single API endpoint.
use async_trait::async_trait;
use reqwest::Client;
use serde_json::Value;
use crate::event_stream::AssistantMessageEventStream;
use crate::model::Model;
use crate::provider::{Provider, SimpleStreamOptions};
use crate::providers::anthropic::sse::SseEventStream;
use crate::types::{
AssistantMessage, AssistantMessageEvent, AssistantRole, Content, Context, DoneReason,
TextContent, TextContentType, Usage,
};
/// OpenRouter API endpoint
const OPENROUTER_API_BASE: &str = "https://openrouter.ai/api/v1";
/// OpenRouter provider implementation
#[derive(Debug, Clone)]
pub struct OpenRouterProvider {
client: Client,
api_key: Option<String>,
}
impl OpenRouterProvider {
/// Create a new OpenRouter provider
pub fn new(api_key: Option<String>) -> Self {
// Shared HTTP builder: HTTP_PROXY/NO_PROXY + pooled idle timeout.
let client = crate::http::build_client(OPENROUTER_API_BASE, None, None)
.unwrap_or_else(|_| Client::new());
Self { client, api_key }
}
/// Build request headers
fn build_headers(&self, opts: &SimpleStreamOptions) -> Vec<(String, String)> {
let mut headers = vec![("Content-Type".to_string(), "application/json".to_string())];
// API key from opts or stored
let api_key = opts.api_key.as_ref().or(self.api_key.as_ref());
if let Some(key) = api_key {
headers.push(("Authorization".to_string(), format!("Bearer {}", key)));
}
// HTTP-Referer header (required by OpenRouter)
headers.push((
"HTTP-Referer".to_string(),
"https://github.com/anthropics/pi-rust".to_string(),
));
// X-Title header
headers.push(("X-Title".to_string(), "Pi Rust".to_string()));
headers.push(("User-Agent".to_string(), crate::http::user_agent()));
headers
}
/// Build request body
fn build_request_body(
&self,
model: &Model,
ctx: &Context,
opts: &SimpleStreamOptions,
) -> Value {
let mut body = serde_json::json!({
"model": model.id,
"messages": ctx.messages,
"stream": true,
});
// Add optional parameters
if let Some(temperature) = opts.temperature {
body["temperature"] = serde_json::json!(temperature);
}
if let Some(max_tokens) = opts.max_tokens {
body["max_tokens"] = serde_json::json!(max_tokens);
}
body
}
}
#[async_trait]
impl Provider for OpenRouterProvider {
fn id(&self) -> &str {
"openrouter"
}
fn models(&self) -> &[Model] {
// OpenRouter supports many models, but we don't statically list them
// Users can specify any OpenRouter model ID in their config
&[]
}
async fn stream_simple(
&self,
model: &Model,
ctx: &Context,
opts: &SimpleStreamOptions,
) -> AssistantMessageEventStream {
use crate::event_stream::create_assistant_message_event_stream;
use crate::types::{ErrorReason, StopReason};
let (mut producer, stream) = create_assistant_message_event_stream();
let url = format!("{}/chat/completions", OPENROUTER_API_BASE);
let headers = self.build_headers(opts);
let body = self.build_request_body(model, ctx, opts);
let client = self.client.clone();
let model_id = model.id.clone();
let api = model.api.clone();
let opts = opts.clone();
tokio::spawn(async move {
let mut request = client.post(&url).json(&body);
for (key, value) in headers {
request = request.header(&key, &value);
}
let result = request.send().await;
match result {
Ok(response) => {
if !response.status().is_success() {
let status = response.status();
let error_text = response
.text()
.await
.unwrap_or_else(|_| "Unknown error".to_string());
let error_msg = format!("HTTP {}: {}", status.as_u16(), error_text);
let error_message = AssistantMessage::terminal(
api,
"openrouter".to_string(),
model_id,
StopReason::Error,
error_msg,
0,
);
producer.push(AssistantMessageEvent::Error {
reason: ErrorReason::Error,
error: error_message,
});
return;
}
// Parse SSE stream
let mut events = SseEventStream::new(response, opts.signal.clone());
let mut content = String::new();
let mut finish_reason = None;
loop {
match events.next_event().await {
Ok(Some(event)) if event.data.trim() == "[DONE]" => {
break;
}
Ok(Some(event)) => {
if let Ok(chunk) =
serde_json::from_str::<serde_json::Value>(&event.data)
{
if let Some(choices) =
chunk.get("choices").and_then(|c| c.as_array())
{
if let Some(choice) = choices.first() {
if let Some(delta) = choice.get("delta") {
if let Some(text) =
delta.get("content").and_then(|c| c.as_str())
{
content.push_str(text);
}
}
if let Some(reason) =
choice.get("finish_reason").and_then(|r| r.as_str())
{
finish_reason = Some(reason.to_string());
}
}
}
}
}
Ok(None) => break,
Err(e) => {
let error_message = AssistantMessage::terminal(
api,
"openrouter".to_string(),
model_id,
StopReason::Error,
format!("SSE stream error: {}", e),
0,
);
producer.push(AssistantMessageEvent::Error {
reason: ErrorReason::Error,
error: error_message,
});
return;
}
}
}
let stop_reason = match finish_reason.as_deref() {
Some("stop") => StopReason::Stop,
Some("length") => StopReason::Length,
Some("tool_calls") => StopReason::ToolUse,
_ => StopReason::Stop,
};
let message = AssistantMessage {
role: AssistantRole,
content: vec![Content::Text(TextContent {
kind: TextContentType,
text: content,
text_signature: None,
})],
api,
provider: "openrouter".to_string(),
model: model_id,
response_model: None,
response_id: None,
usage: Usage::zero(),
stop_reason,
deferred: None,
error_message: None,
raw_stop_reason: finish_reason,
end_turn: None,
timestamp: 0,
};
let done_reason = match stop_reason {
StopReason::Stop => DoneReason::Stop,
StopReason::Length => DoneReason::Length,
StopReason::ToolUse => DoneReason::ToolUse,
_ => DoneReason::Stop,
};
producer.push(AssistantMessageEvent::Done {
reason: done_reason,
message,
});
}
Err(e) => {
let error_message = AssistantMessage::terminal(
api,
"openrouter".to_string(),
model_id,
StopReason::Error,
format!("Request failed: {}", e),
0,
);
producer.push(AssistantMessageEvent::Error {
reason: ErrorReason::Error,
error: error_message,
});
}
}
});
stream
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_openrouter_provider_creation() {
let provider = OpenRouterProvider::new(Some("test-key".to_string()));
assert_eq!(provider.id(), "openrouter");
}
}