243 lines
8.8 KiB
Rust
243 lines
8.8 KiB
Rust
//! `HttpTransport<S: Scheme>`: すべての LLM wire scheme を共通の 1 本の
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//! HTTP クライアントで扱う。
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//!
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//! 旧 `providers/{anthropic,openai,gemini,ollama}.rs` を置き換える。
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//! scheme 固有の差分は [`Scheme`] trait 実装に委譲する。
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use std::pin::Pin;
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use std::sync::Arc;
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use async_trait::async_trait;
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use eventsource_stream::Eventsource;
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use futures::{Stream, StreamExt, TryStreamExt};
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use reqwest::header::{CONTENT_TYPE, HeaderMap, HeaderValue};
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use super::auth::{AuthProvider, AuthRequirement};
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use super::capability::ModelCapability;
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use super::client::{ConfigWarning, LlmClient};
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use super::error::ClientError;
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use super::event::Event;
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use super::scheme::Scheme;
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use super::types::{Request, RequestConfig};
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/// `AuthRef` を解決したランタイム表現。`crates/provider` が構築する。
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///
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/// - `None`: 認証ヘッダを送らない（Ollama 等の opt-out）
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/// - `ApiKey`: 静的な API key 文字列
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/// - `Custom`: リクエスト毎に動的にヘッダを組み立てる（Codex OAuth 等）
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#[derive(Debug, Clone)]
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pub enum ResolvedAuth {
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None,
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ApiKey(String),
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Custom(Arc<dyn AuthProvider>),
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}
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impl ResolvedAuth {
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/// 認証要件と実際の解決値が噛み合うか検査する。構築時検証用。
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///
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/// - `ResolvedAuth::None` は認証を付けない宣言なので、どの
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/// `AuthRequirement` でも受け入れる（Ollama の Anthropic scheme
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/// 流用は `required_auth = XApiKey` だが認証ヘッダなしで動く）
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/// - `ResolvedAuth::Custom` は「ヘッダ組立を全部こちらで行う」
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/// 宣言なので、scheme が要求する形式によらず受け入れる
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pub fn matches(&self, req: AuthRequirement) -> bool {
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match (self, req) {
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(Self::None, _) => true,
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(Self::Custom(_), _) => true,
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(
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Self::ApiKey(_),
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AuthRequirement::Bearer | AuthRequirement::XApiKey | AuthRequirement::QueryParam { .. },
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) => true,
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_ => false,
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}
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}
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}
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/// scheme 共通の HTTP 通信層。
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pub struct HttpTransport<S: Scheme> {
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http_client: reqwest::Client,
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scheme: S,
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model_id: String,
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base_url: String,
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auth: ResolvedAuth,
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capability: ModelCapability,
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}
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impl<S: Scheme> HttpTransport<S> {
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/// 新しい transport を作る。`base_url` は末尾スラッシュの有無を
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/// どちらでも受け付ける（内部で正規化）。
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pub fn new(
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scheme: S,
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model_id: impl Into<String>,
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base_url: impl Into<String>,
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auth: ResolvedAuth,
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capability: ModelCapability,
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) -> Self {
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let base_url = base_url.into();
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let base_url = base_url.trim_end_matches('/').to_string();
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Self {
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http_client: reqwest::Client::new(),
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scheme,
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model_id: model_id.into(),
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base_url,
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auth,
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capability,
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}
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}
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/// カスタム HTTP クライアントを差し込む（テスト等）。
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pub fn with_http_client(mut self, client: reqwest::Client) -> Self {
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self.http_client = client;
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self
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}
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fn build_url(&self) -> String {
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let path = self.scheme.path(&self.model_id);
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let url = format!("{}{}", self.base_url, path);
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// Gemini のようにクエリパラメータで認証する場合は URL にキーを追記する
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if let (AuthRequirement::QueryParam { name }, ResolvedAuth::ApiKey(key)) =
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(self.scheme.required_auth(), &self.auth)
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{
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let sep = if url.contains('?') { '&' } else { '?' };
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format!("{url}{sep}{name}={key}")
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} else {
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url
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}
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}
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async fn build_headers(&self) -> Result<HeaderMap, ClientError> {
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let mut headers = HeaderMap::new();
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headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
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match (&self.auth, self.scheme.required_auth()) {
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(ResolvedAuth::None, _) | (_, AuthRequirement::None) => {}
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(ResolvedAuth::Custom(provider), _) => {
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for (name, mut value) in provider.headers().await? {
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value.set_sensitive(true);
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headers.insert(name, value);
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}
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}
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(ResolvedAuth::ApiKey(key), AuthRequirement::Bearer) => {
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let mut val = HeaderValue::from_str(&format!("Bearer {key}"))
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.map_err(|e| ClientError::Config(format!("invalid api key: {e}")))?;
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val.set_sensitive(true);
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headers.insert("Authorization", val);
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}
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(ResolvedAuth::ApiKey(key), AuthRequirement::XApiKey) => {
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let mut val = HeaderValue::from_str(key.as_str())
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.map_err(|e| ClientError::Config(format!("invalid api key: {e}")))?;
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val.set_sensitive(true);
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headers.insert("x-api-key", val);
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}
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(_, AuthRequirement::QueryParam { .. }) => {
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// クエリパラメータは `build_url` で付与済み
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}
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(ResolvedAuth::ApiKey(_), AuthRequirement::Custom) => {
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// scheme が Custom を要求する組合せに ApiKey は流れてこない想定
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// （`matches()` で弾かれる）。安全側で何もしない
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}
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}
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for (name, value) in self.scheme.additional_headers() {
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let hv = HeaderValue::from_str(&value)
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.map_err(|e| ClientError::Config(format!("invalid header {name}: {e}")))?;
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headers.insert(name, hv);
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}
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Ok(headers)
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}
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}
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impl<S: Scheme + Clone> Clone for HttpTransport<S> {
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fn clone(&self) -> Self {
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Self {
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http_client: self.http_client.clone(),
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scheme: self.scheme.clone(),
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model_id: self.model_id.clone(),
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base_url: self.base_url.clone(),
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auth: self.auth.clone(),
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capability: self.capability.clone(),
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}
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}
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}
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#[async_trait]
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impl<S: Scheme + Clone + 'static> LlmClient for HttpTransport<S> {
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fn clone_boxed(&self) -> Box<dyn LlmClient> {
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Box::new(self.clone())
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}
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fn validate_config(&self, config: &RequestConfig) -> Vec<ConfigWarning> {
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self.scheme.validate_config(config)
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}
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async fn stream(
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&self,
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request: Request,
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) -> Result<Pin<Box<dyn Stream<Item = Result<Event, ClientError>> + Send>>, ClientError> {
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let url = self.build_url();
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let headers = self.build_headers().await?;
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let body = self
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.scheme
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.build_request_body(&self.model_id, &request, &self.capability);
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let response = self
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.http_client
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.post(&url)
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.headers(headers)
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.json(&body)
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.send()
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.await?;
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if !response.status().is_success() {
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let status = response.status().as_u16();
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let text = response.text().await.unwrap_or_default();
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if let Ok(json) = serde_json::from_str::<serde_json::Value>(&text) {
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let error = json.get("error").unwrap_or(&json);
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let code = error.get("type").and_then(|v| v.as_str()).map(String::from);
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let message = error
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.get("message")
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.and_then(|v| v.as_str())
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.unwrap_or(&text)
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.to_string();
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return Err(ClientError::Api {
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status: Some(status),
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code,
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message,
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});
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}
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return Err(ClientError::Api {
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status: Some(status),
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code: None,
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message: text,
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});
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}
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let scheme = self.scheme.clone();
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let byte_stream = response.bytes_stream().map_err(std::io::Error::other);
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let event_stream = byte_stream.eventsource();
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// scheme 固有のパース状態をストリーム単位で保持する
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let mut state = <S::State as Default>::default();
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let stream = event_stream
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.map(move |result| match result {
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Ok(frame) => match scheme.parse_sse(&frame.event, &frame.data, &mut state) {
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Ok(events) => Ok(events),
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Err(e) => Err(e),
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},
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Err(e) => Err(ClientError::Sse(e.to_string())),
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})
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.map(|res| {
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let s: Pin<Box<dyn Stream<Item = Result<Event, ClientError>> + Send>> = match res {
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Ok(events) => Box::pin(futures::stream::iter(events.into_iter().map(Ok))),
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Err(e) => Box::pin(futures::stream::once(async move { Err(e) })),
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};
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s
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})
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.flatten();
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Ok(Box::pin(stream))
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}
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}
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