20260620 优化delta长尾控制面和PP cache快路径

src/fetch/http.rs

@@ -1,3 +1,4 @@
+use std::cell::RefCell;
 use std::io::Write;
 use std::time::Duration;
 
@@ -6,6 +7,19 @@ use reqwest::header::HeaderMap;
 
 use crate::sync::rrdp::Fetcher;
 
+thread_local! {
+    static HTTP_TIMEOUT_OVERRIDE: RefCell<Option<Duration>> = const { RefCell::new(None) };
+}
+
+pub fn with_scoped_http_timeout_override<R>(timeout: Duration, f: impl FnOnce() -> R) -> R {
+    HTTP_TIMEOUT_OVERRIDE.with(|cell| {
+        let previous = cell.replace(Some(timeout));
+        let result = f();
+        let _ = cell.replace(previous);
+        result
+    })
+}
+
 #[derive(Clone, Debug)]
 pub struct HttpFetcherConfig {
     /// Connection-establishment timeout for HTTP requests.
@@ -37,6 +51,7 @@ impl Default for HttpFetcherConfig {
 pub struct BlockingHttpFetcher {
     short_client: Client,
     large_body_client: Client,
+    retry_short_client: Client,
     short_timeout: Duration,
     large_body_timeout: Duration,
 }
@@ -58,9 +73,16 @@ impl BlockingHttpFetcher {
             .user_agent(config.user_agent)
             .build()
             .map_err(|e| e.to_string())?;
+        let retry_short_client = Client::builder()
+            .connect_timeout(Duration::from_secs(1))
+            .timeout(Duration::from_secs(1))
+            .user_agent("rpki-dev/0.1 (stage2)")
+            .build()
+            .map_err(|e| e.to_string())?;
         Ok(Self {
             short_client,
             large_body_client,
+            retry_short_client,
             short_timeout,
             large_body_timeout,
         })
@@ -176,6 +198,9 @@ impl BlockingHttpFetcher {
     }
 
     fn client_for_uri(&self, uri: &str) -> (&Client, &'static str, Duration) {
+        if let Some(timeout) = HTTP_TIMEOUT_OVERRIDE.with(|cell| *cell.borrow()) {
+            return (&self.retry_short_client, "retry_short", timeout);
+        }
         if uses_large_body_timeout(uri) {
             (
                 &self.large_body_client,