mapping

src/config.rs

@@ -1,14 +1,26 @@
 use std::{fs, path::Path};
 
 use eyre::{Result, WrapErr};
+use hashbrown::HashMap;
 use serde::Deserialize;
 
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum UrlProvider {
+    Lookahead,
+    UrlProvider,
+}
+
 #[derive(Debug, Deserialize)]
 pub struct Config {
     #[serde(rename = "lookahead-providers-relays")]
     pub lookahead_providers_relays: Vec<LookaheadProvider>,
     #[serde(rename = "beacon-urls")]
     pub beacon_urls: Vec<String>,
+    #[serde(rename = "url-provider")]
+    pub url_provider: UrlProvider,
+    #[serde(rename = "pubkey-url-map")]
+    pub url_map: Option<HashMap<String, String>>,
 }
 
 #[derive(Debug, Deserialize)]

src/forward_service.rs

@@ -94,7 +94,7 @@ impl RpcForward {
 
 fn router(shared_state: SharedState) -> Router {
     Router::new()
-        .route("/:scan_id", post(scan_id_forward_request))
+        .route("/:chain_id", post(scan_id_forward_request))
         .route("/", post(forward_request))
         .layer(TraceLayer::new_for_http())
         .with_state(Arc::new(shared_state))
@@ -107,27 +107,32 @@ async fn scan_id_forward_request(
     body: Bytes,
 ) -> Result<impl IntoResponse, impl IntoResponse> {
     if let Some(manager) = state.managers.get(&chain_id) {
-        if let Some(entry) = manager.get_next_elected_preconfer() {
-            match inner_forward_request(&state.client, &entry.url, body, headers).await {
-                Ok(res) => Ok(res),
-                Err(_) => Err((
-                    StatusCode::INTERNAL_SERVER_ERROR,
-                    "error while forwarding request".to_string(),
-                )),
-            }
-        } else {
-            Err((
-                StatusCode::INTERNAL_SERVER_ERROR,
-                format!("no preconfer has been elected for chain_id {}", chain_id),
-            ))
+        match manager.get_url() {
+            None => Err((
+                StatusCode::BAD_REQUEST,
+                format!("no lookahead entry found for chain-id {}", chain_id),
+            )),
+            Some(url) => match url {
+                Ok(url) => match inner_forward_request(&state.client, &url, body, headers).await {
+                    Ok(res) => Ok(res),
+                    Err(_) => Err((
+                        StatusCode::INTERNAL_SERVER_ERROR,
+                        "error while forwarding request".to_string(),
+                    )),
+                },
+                Err(err) => Err((StatusCode::INTERNAL_SERVER_ERROR, err.to_string())),
+            },
         }
     } else {
-        Err((StatusCode::BAD_REQUEST, format!("no lookahead provider found for id {}", chain_id)))
+        Err((
+            StatusCode::BAD_REQUEST,
+            format!("no lookahead provider found for chain-id {}", chain_id),
+        ))
     }
 }
 
 async fn forward_request(State(_state): State<Arc<SharedState>>) -> impl IntoResponse {
-    (StatusCode::BAD_REQUEST, "missing chain_id parameter")
+    (StatusCode::BAD_REQUEST, "missing chain-id parameter")
 }
 
 async fn inner_forward_request(
@@ -148,6 +153,7 @@ mod test {
         time::Duration,
     };
 
+    use alloy::rpc::types::beacon::{constants::BLS_PUBLIC_KEY_BYTES_LEN, BlsPublicKey};
     use axum::{
         extract::State,
         http::HeaderMap,
@@ -163,7 +169,8 @@ mod test {
 
     use crate::{
         forward_service::{router, SharedState},
-        lookahead::{Lookahead, LookaheadEntry, LookaheadManager, LookaheadProvider},
+        lookahead::{Lookahead, LookaheadEntry, LookaheadManager, LookaheadProvider, UrlProvider},
+        preconf::election::{PreconferElection, SignedPreconferElection},
     };
 
     struct DummySharedState {
@@ -176,6 +183,7 @@ mod test {
             let manager = LookaheadManager::new(
                 Lookahead { map: DashMap::new().into() },
                 LookaheadProvider::None,
+                UrlProvider::LookaheadEntry,
             );
             let mut managers = HashMap::new();
             managers.insert(1u16, manager);
@@ -186,7 +194,7 @@ mod test {
         tokio::time::sleep(Duration::from_secs(1)).await;
         let res = reqwest::Client::new().post("http://localhost:12001").send().await.unwrap();
         assert_eq!(res.status(), StatusCode::BAD_REQUEST);
-        assert_eq!(res.text().await.unwrap(), "missing chain_id parameter");
+        assert_eq!(res.text().await.unwrap(), "missing chain-id parameter");
         Ok(())
     }
 
@@ -196,6 +204,7 @@ mod test {
             let manager = LookaheadManager::new(
                 Lookahead { map: DashMap::new().into() },
                 LookaheadProvider::None,
+                UrlProvider::LookaheadEntry,
             );
             let mut managers = HashMap::new();
             managers.insert(1u16, manager);
@@ -206,7 +215,7 @@ mod test {
         tokio::time::sleep(Duration::from_secs(1)).await;
         let res = reqwest::Client::new().post("http://localhost:12002/2").send().await.unwrap();
         assert_eq!(res.status(), StatusCode::BAD_REQUEST);
-        assert_eq!(res.text().await.unwrap(), "no lookahead provider found for id 2");
+        assert_eq!(res.text().await.unwrap(), "no lookahead provider found for chain-id 2");
         Ok(())
     }
 
@@ -218,7 +227,11 @@ mod test {
                 url: "http://not-a-valid-url".into(),
                 ..Default::default()
             });
-            let manager = LookaheadManager::new(Lookahead { map }, LookaheadProvider::None);
+            let manager = LookaheadManager::new(
+                Lookahead { map },
+                LookaheadProvider::None,
+                UrlProvider::LookaheadEntry,
+            );
             let mut managers = HashMap::new();
             managers.insert(1u16, manager);
             let router = router(SharedState::new(managers).unwrap());
@@ -248,7 +261,11 @@ mod test {
                 url: "http://localhost:12004".into(),
                 ..Default::default()
             });
-            let manager = LookaheadManager::new(Lookahead { map }, LookaheadProvider::None);
+            let manager = LookaheadManager::new(
+                Lookahead { map },
+                LookaheadProvider::None,
+                UrlProvider::LookaheadEntry,
+            );
             let mut managers = HashMap::new();
             managers.insert(1u16, manager);
             let router = router(SharedState::new(managers).unwrap());
@@ -276,6 +293,96 @@ mod test {
         Ok(())
     }
 
+    #[tokio::test]
+    async fn test_url_map_request() -> Result<()> {
+        tokio::spawn(async move {
+            let dst = Arc::new(Mutex::new(DummySharedState { cnt: 0 }));
+            let router: Router = Router::new()
+                .route("/", post(handle_request))
+                .route("/cnt", get(counter))
+                .with_state(dst);
+            let listener = tokio::net::TcpListener::bind("localhost:12006").await.unwrap();
+            axum::serve(listener, router).await.unwrap();
+        });
+        tokio::spawn(async move {
+            let map = Arc::new(DashMap::new());
+            let signature: BlsPublicKey = BlsPublicKey::from([42u8; BLS_PUBLIC_KEY_BYTES_LEN]);
+            let mut url_mapping = HashMap::new();
+            url_mapping.insert(signature.to_string(), "http://localhost:12006".into());
+            map.insert(0, LookaheadEntry {
+                url: "".into(),
+                election: SignedPreconferElection {
+                    message: PreconferElection {
+                        preconfer_pubkey: signature.clone(),
+                        ..Default::default()
+                    },
+                    ..Default::default()
+                },
+            });
+            let manager = LookaheadManager::new(
+                Lookahead { map },
+                LookaheadProvider::None,
+                UrlProvider::UrlMap(url_mapping),
+            );
+            let mut managers = HashMap::new();
+            managers.insert(1u16, manager);
+            let router = router(SharedState::new(managers).unwrap());
+            let listener = tokio::net::TcpListener::bind("localhost:12007").await.unwrap();
+            axum::serve(listener, router).await.unwrap();
+        });
+        tokio::time::sleep(Duration::from_secs(1)).await;
+        for _ in 0..10 {
+            let mut headers = HeaderMap::new();
+            headers.insert("Content-Type", HeaderValue::from_str("application/json").unwrap());
+            let res = reqwest::Client::new()
+                .post("http://localhost:12007/1")
+                .body("dummy plain body")
+                .headers(headers)
+                .headers(HeaderMap::new())
+                .send()
+                .await
+                .unwrap();
+            assert_eq!(res.status(), StatusCode::OK);
+        }
+
+        let cnt_res = reqwest::get("http://localhost:12006/cnt").await.unwrap();
+        assert_eq!(StatusCode::OK, cnt_res.status());
+        assert_eq!(cnt_res.text().await.unwrap(), "10");
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_no_pubkey() -> Result<()> {
+        tokio::spawn(async move {
+            let signature: BlsPublicKey = BlsPublicKey::from([42u8; BLS_PUBLIC_KEY_BYTES_LEN]);
+            let map = Arc::new(DashMap::new());
+            let mut provider = HashMap::new();
+            provider.insert(signature.to_string(), "http:://not-a-valid-http".into());
+            map.insert(0, LookaheadEntry { url: "".into(), ..Default::default() });
+            let manager = LookaheadManager::new(
+                Lookahead { map },
+                LookaheadProvider::None,
+                UrlProvider::UrlMap(provider),
+            );
+            let mut managers = HashMap::new();
+            managers.insert(1u16, manager);
+            let router = router(SharedState::new(managers).unwrap());
+            let listener = tokio::net::TcpListener::bind("localhost:12008").await.unwrap();
+            axum::serve(listener, router).await.unwrap();
+        });
+        tokio::time::sleep(Duration::from_secs(1)).await;
+        let res = reqwest::Client::new().post("http://localhost:12008/1").send().await.unwrap();
+        assert_eq!(res.status(), StatusCode::INTERNAL_SERVER_ERROR);
+        assert_eq!(
+            res.text().await.unwrap(),
+            format!(
+                "could not find key for pubkey {}",
+                BlsPublicKey::from([0u8; BLS_PUBLIC_KEY_BYTES_LEN]).to_string()
+            )
+        );
+        Ok(())
+    }
+
     async fn handle_request(
         State(state): State<Arc<Mutex<DummySharedState>>>,
         headers: HeaderMap,

src/lookahead/manager.rs

@@ -1,6 +1,6 @@
 use alloy::rpc::types::beacon::events::HeadEvent;
 use dashmap::DashMap;
-use eyre::{bail, Result};
+use eyre::{bail, ContextCompat, Result};
 use hashbrown::HashMap;
 use tokio::sync::broadcast;
 
@@ -16,17 +16,29 @@ enum LookaheadProviderManager {
     Running,
 }
 
+#[derive(Debug, Clone)]
+pub enum UrlProvider {
+    LookaheadEntry,
+    UrlMap(HashMap<String, String>),
+}
+
 /// Manages the lookahead for preconfer elections.
 pub struct LookaheadManager {
     lookahead: Lookahead,
     provider_manager: Option<LookaheadProviderManager>,
+    url_provider: UrlProvider,
 }
 
 impl LookaheadManager {
-    pub fn new(lookahead: Lookahead, lookahead_provider: LookaheadProvider) -> Self {
+    pub fn new(
+        lookahead: Lookahead,
+        lookahead_provider: LookaheadProvider,
+        url_provider: UrlProvider,
+    ) -> Self {
         Self {
             lookahead,
             provider_manager: Some(LookaheadProviderManager::Initialized(lookahead_provider)),
+            url_provider,
         }
     }
 
@@ -47,16 +59,38 @@ impl LookaheadManager {
         }
     }
 
-    pub fn get_next_elected_preconfer(&self) -> Option<LookaheadEntry> {
+    fn get_next_elected_preconfer(&self) -> Option<LookaheadEntry> {
         self.lookahead.get_next_elected_preconfer()
     }
+
+    pub fn get_url(&self) -> Option<Result<String>> {
+        self.get_next_elected_preconfer().map(|entry| match &self.url_provider {
+            UrlProvider::LookaheadEntry => Ok(entry.url),
+            UrlProvider::UrlMap(m) => {
+                let pubkey = entry.election.preconfer_pubkey().to_string();
+                m.get(&pubkey)
+                    .cloned()
+                    .wrap_err(format!("could not find key for pubkey {}", pubkey))
+            }
+        })
+    }
 }
 
 /// BBuilds a map of lookahead managers from the configuration, keyed by the chain-id.
 pub fn lookahead_managers_from_config(
     config: Config,
     beacon_tx: broadcast::Sender<HeadEvent>,
 ) -> HashMap<u16, LookaheadManager> {
+    let url_provider = match config.url_provider {
+        crate::config::UrlProvider::Lookahead => UrlProvider::LookaheadEntry,
+        crate::config::UrlProvider::UrlProvider => {
+            let mut m = HashMap::new();
+            for (key, value) in config.url_map.expect("pubkey-url-map not present") {
+                m.insert(key, value);
+            }
+            UrlProvider::UrlMap(m)
+        }
+    };
     // build managers from relay lookahead providers
     let mut map = HashMap::new();
     for r_c in config.lookahead_providers_relays {
@@ -70,7 +104,7 @@ pub fn lookahead_managers_from_config(
             )),
         }
         .build_relay_provider();
-        map.insert(r_c.chain_id, LookaheadManager::new(lookahead, provider));
+        map.insert(r_c.chain_id, LookaheadManager::new(lookahead, provider, url_provider.clone()));
     }
     map
 }

src/preconf/constraints.rs

@@ -60,6 +60,5 @@ mod tests {
 
         let s = serde_json::to_string(&singed_constraints).unwrap();
         let encode = alloy::primitives::hex::encode(s);
-        println!("{}", encode);
     }
 }