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use super::super::OpenRouterProvider;
use crate::provider::{
LLMError, LLMNormalizedStream, LLMProvider, LLMRequest, LLMResponse, LLMStream, LLMStreamEvent,
NormalizedStreamEvent,
};
use crate::providers::error_handling::{format_network_error, format_parse_error};
use crate::providers::shared::Utf8StreamDecoder;
use async_stream::try_stream;
use async_trait::async_trait;
use futures::StreamExt;
use hashbrown::{HashMap, HashSet};
use serde_json::Value;
use super::super::response_parser;
#[async_trait]
impl LLMProvider for OpenRouterProvider {
fn name(&self) -> &str {
"openrouter"
}
fn supports_streaming(&self) -> bool {
true
}
fn supports_reasoning(&self, _model: &str) -> bool {
self.model_behavior
.as_ref()
.and_then(|b| b.model_supports_reasoning)
.unwrap_or(false)
}
fn supports_reasoning_effort(&self, _model: &str) -> bool {
self.model_behavior
.as_ref()
.and_then(|b| b.model_supports_reasoning_effort)
.unwrap_or(false)
}
fn supports_tools(&self, model: &str) -> bool {
use vtcode_config::constants::models;
!models::openrouter::TOOL_UNAVAILABLE_MODELS.contains(&model)
}
async fn generate(&self, request: LLMRequest) -> Result<LLMResponse, LLMError> {
let model = self.resolve_model(&request).to_string();
let response = self.send_with_fallback(&request, Some(false)).await?;
let response_json: Value = response.json().await.map_err(|e| format_parse_error("OpenRouter", &e))?;
let include_cache_metrics = self.prompt_cache_enabled && self.prompt_cache_settings.report_savings;
response_parser::parse_response(response_json, model, include_cache_metrics)
}
async fn stream(&self, request: LLMRequest) -> Result<LLMStream, LLMError> {
let model = self.resolve_model(&request).to_string();
let response = self.send_with_fallback(&request, Some(true)).await?;
let stream = try_stream! {
let mut body_stream = response.bytes_stream();
let mut buffer = String::new();
let mut decoder = Utf8StreamDecoder::new();
let mut aggregator = crate::providers::shared::StreamAggregator::new(model);
while let Some(chunk_result) = body_stream.next().await {
let chunk = chunk_result.map_err(|e| format_network_error("OpenRouter", &e))?;
buffer.push_str(&decoder.push(&chunk));
while let Some((split_idx, delimiter_len)) = crate::providers::shared::find_sse_boundary(&buffer) {
let event = buffer[..split_idx].to_string();
buffer.drain(..split_idx + delimiter_len);
if let Some(data_payload) = crate::providers::shared::extract_data_payload(&event) {
let trimmed = data_payload.trim();
if trimmed.is_empty() || trimmed == "[DONE]" {
continue;
}
if let Ok(payload) = serde_json::from_str::<Value>(trimmed) {
if let Some(choices) = payload.get("choices").and_then(|v| v.as_array()) {
if let Some(choice) = choices.first() {
if let Some(delta) = choice.get("delta") {
// Handle dedicated reasoning field (e.g. reasoning_content or reasoning)
if let Some(reasoning) = delta
.get("reasoning_content")
.or_else(|| delta.get("reasoning"))
.and_then(|v| v.as_str())
{
if let Some(delta) = aggregator.handle_reasoning(reasoning) {
yield LLMStreamEvent::Reasoning { delta };
}
}
// Handle standard content field
if let Some(content) = delta.get("content").and_then(|v| v.as_str()) {
for ev in aggregator.handle_content(content) {
yield ev;
}
}
// Handle structured reasoning_details field
if let Some(reasoning_details) = delta
.get("reasoning_details")
.and_then(|v| v.as_array())
{
// Extract new reasoning text from structured details
let prev_reasoning = aggregator.reasoning.clone();
aggregator.set_reasoning_details(reasoning_details);
// If reasoning text grew, yield the delta
if let Some(new_reasoning) = crate::providers::common::extract_reasoning_text_from_detail_values(reasoning_details) {
if new_reasoning.len() > prev_reasoning.len() {
let delta = new_reasoning[prev_reasoning.len()..].to_string();
if !delta.trim().is_empty() {
yield LLMStreamEvent::Reasoning { delta };
}
}
}
}
// Handle tool calls in deltas
if let Some(tool_calls) = delta.get("tool_calls").and_then(|v| v.as_array()) {
aggregator.handle_tool_calls(tool_calls);
}
}
if let Some(finish_reason) = choice.get("finish_reason").and_then(|v| v.as_str()) {
aggregator.set_finish_reason(crate::providers::common::map_finish_reason_common(finish_reason));
}
}
}
if let Some(usage) = crate::providers::common::parse_usage_openai_format(&payload, true) {
aggregator.set_usage(usage);
}
}
}
}
}
yield LLMStreamEvent::Completed { response: Box::new(aggregator.finalize()) };
};
Ok(Box::pin(stream))
}
async fn stream_normalized(&self, request: LLMRequest) -> Result<LLMNormalizedStream, LLMError> {
let resolved_model = self.resolve_model(&request).to_string();
let response = self.send_with_fallback(&request, Some(true)).await?;
let stream = try_stream! {
let mut body_stream = response.bytes_stream();
let mut buffer = String::new();
let mut decoder = Utf8StreamDecoder::new();
let mut aggregator = crate::providers::shared::StreamAggregator::new(resolved_model);
let mut seen_tool_calls = HashSet::new();
// Ids fabricated for id-less tool calls, keyed by the provider's
// tool-call index so every delta of one logical call reuses the
// same id. Index-based fallback ids (`tool_call_{index}`) reset per
// response and collide across assistant messages downstream.
let mut fabricated_ids: HashMap<usize, String> = HashMap::new();
while let Some(chunk_result) = body_stream.next().await {
let chunk = chunk_result.map_err(|e| format_network_error("OpenRouter", &e))?;
buffer.push_str(&decoder.push(&chunk));
while let Some((split_idx, delimiter_len)) =
crate::providers::shared::find_sse_boundary(&buffer)
{
let event = buffer[..split_idx].to_string();
buffer.drain(..split_idx + delimiter_len);
if let Some(data_payload) =
crate::providers::shared::extract_data_payload(&event)
{
let trimmed = data_payload.trim();
if trimmed.is_empty() || trimmed == "[DONE]" {
continue;
}
if let Ok(payload) = serde_json::from_str::<Value>(trimmed) {
if let Some(choices) = payload.get("choices").and_then(|v| v.as_array()) {
if let Some(choice) = choices.first() {
if let Some(delta) = choice.get("delta") {
if let Some(reasoning) = delta
.get("reasoning_content")
.or_else(|| delta.get("reasoning"))
.and_then(|v| v.as_str())
{
if let Some(delta) = aggregator.handle_reasoning(reasoning) {
yield NormalizedStreamEvent::ReasoningDelta { delta };
}
}
if let Some(content) = delta.get("content").and_then(|v| v.as_str()) {
for ev in aggregator.handle_content(content) {
if let LLMStreamEvent::Token { delta } = ev {
yield NormalizedStreamEvent::TextDelta { delta };
} else if let LLMStreamEvent::Reasoning { delta } = ev {
yield NormalizedStreamEvent::ReasoningDelta { delta };
}
}
}
if let Some(reasoning_details) = delta
.get("reasoning_details")
.and_then(|v| v.as_array())
{
let prev_reasoning = aggregator.reasoning.clone();
aggregator.set_reasoning_details(reasoning_details);
if let Some(new_reasoning) =
crate::providers::common::extract_reasoning_text_from_detail_values(reasoning_details)
{
if new_reasoning.len() > prev_reasoning.len() {
let delta = new_reasoning[prev_reasoning.len()..].to_string();
if !delta.trim().is_empty() {
yield NormalizedStreamEvent::ReasoningDelta { delta };
}
}
}
}
if let Some(tool_calls) = delta.get("tool_calls").and_then(|v| v.as_array()) {
// Patch fabricated ids into the payload handed to the
// aggregator so the ids in streamed events match the
// ids in the finalized response (lifecycle consumers
// correlate by call_id).
let mut patched_tool_calls = tool_calls.clone();
for (position, tool_call) in patched_tool_calls.iter_mut().enumerate() {
let index = tool_call
.get("index")
.and_then(|value| value.as_u64())
.map(|value| value as usize)
.unwrap_or(position);
let call_id = match tool_call
.get("id")
.and_then(|value| value.as_str())
.filter(|value| !value.is_empty())
.map(ToOwned::to_owned)
{
Some(call_id) => call_id,
None => {
let call_id = fabricated_ids
.entry(index)
.or_insert_with(crate::providers::shared::generate_tool_call_id)
.clone();
if let Some(object) = tool_call.as_object_mut() {
object.insert(
"id".to_string(),
Value::String(call_id.clone()),
);
}
call_id
}
};
if seen_tool_calls.insert(call_id.clone()) {
let name = tool_call
.get("function")
.and_then(|value| value.get("name"))
.and_then(|value| value.as_str())
.map(ToOwned::to_owned);
yield NormalizedStreamEvent::ToolCallStart {
call_id: call_id.clone(),
name,
};
}
if let Some(arguments) = tool_call
.get("function")
.and_then(|value| value.get("arguments"))
.and_then(|value| value.as_str())
{
if !arguments.is_empty() {
yield NormalizedStreamEvent::ToolCallDelta {
call_id: call_id.clone(),
delta: arguments.to_string(),
};
}
}
}
aggregator.handle_tool_calls(&patched_tool_calls);
}
}
if let Some(finish_reason) = choice.get("finish_reason").and_then(|v| v.as_str()) {
aggregator.set_finish_reason(crate::providers::common::map_finish_reason_common(finish_reason));
}
}
}
if let Some(usage) = crate::providers::common::parse_usage_openai_format(&payload, true) {
aggregator.set_usage(usage.clone());
yield NormalizedStreamEvent::Usage { usage };
}
}
}
}
}
yield NormalizedStreamEvent::Done {
response: Box::new(aggregator.finalize()),
};
};
Ok(Box::pin(stream))
}
fn supported_models(&self) -> Vec<String> {
use vtcode_config::constants::models;
models::openrouter::SUPPORTED_MODELS.iter().map(|s| s.to_string()).collect()
}
fn validate_request(&self, request: &LLMRequest) -> Result<(), LLMError> {
if request.messages.is_empty() {
return Err(LLMError::InvalidRequest {
message: "Messages cannot be empty".to_string(),
metadata: None,
});
}
Ok(())
}
}