IT COMPILES! GOD EXISTS! IT COMPILES!

Cargo.lock

@@ -680,6 +680,7 @@ name = "hacker-challenge"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "async-stream",
  "ed25519-dalek",
  "futures",
  "hex",
@@ -690,6 +691,7 @@ dependencies = [
  "salvo",
  "tabled",
  "tokio",
+ "tokio-stream",
  "tonic",
  "tonic-build",
 ]

Cargo.toml

@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies]
 anyhow = "1.0.86"
+async-stream = "0.3.5"
 ed25519-dalek = { version = "2.1.1", features = ["rand_core", "serde"] }
 futures = "0.3.30"
 hex = "0.4.3"
@@ -15,6 +16,7 @@ rand = "0.8.5"
 salvo = { version = "0.70.0", features = ["affix"] }
 tabled = "0.16.0"
 tokio = { version = "1.39.2", features = ["macros"] }
+tokio-stream = { version = "0.1.15" }
 tonic = "0.12.1"
 
 [build-dependencies]

proto/challenge.proto

@@ -10,6 +10,6 @@ message NodeUpdate {
    bool online = 4;
 }
 
-service KeyDistribution {
-    rpc UpdateStreaming (stream NodeUpdate) returns (stream NodeUpdate);
+service Update {
+    rpc GetUpdates (stream NodeUpdate) returns (stream NodeUpdate);
 }

src/datastore.rs

@@ -62,7 +62,7 @@ impl Store {
         }
     }
 
-    pub async fn add_mock_node(&self, ip: String) {
+    pub async fn add_mock_node(&self, ip: IP) {
         let mut csprng = OsRng;
         let privkey = ed25519_dalek::SigningKey::generate(&mut csprng);
         self.update_node(

src/grpc.rs

@@ -1,90 +1,83 @@
-use crate::database;
-use crate::database::NodeInfo;
-use challenge::key_distribution_server::{KeyDistribution, KeyDistributionServer};
-use challenge::{RemoveNodeReq, UpdateKeyReq, UpdateNodeReq};
-use ed25519_dalek::SigningKey;
-use prost_types::Timestamp;
-use rand::rngs::OsRng;
-use std::time::{Duration, SystemTime, UNIX_EPOCH};
-use tonic::{transport::Server, Request, Response, Status};
+#![allow(dead_code)]
+
+use crate::datastore::Store;
+use challenge::NodeUpdate;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::thread::JoinHandle;
+use tokio::sync::broadcast::Sender;
+use tokio_stream::{Stream, StreamExt};
+use tonic::{transport::Server, Request, Response, Status, Streaming};
 
 pub mod challenge {
     tonic::include_proto!("challenge");
 }
 
-#[derive(Debug, Default)]
-pub struct MyKeyDistribution {}
-
-fn update_db(ip: String, privkey: String, updated_at: Option<Timestamp>) {
-    let key_bytes = hex::decode(privkey).unwrap();
-    let privkey = SigningKey::from_bytes(&key_bytes.as_slice().try_into().unwrap());
-    let pubkey = privkey.verifying_key();
-    let updated_at: std::time::SystemTime = match updated_at {
-        Some(ts) => {
-            let duration = Duration::new(ts.seconds as u64, ts.nanos as u32);
-            UNIX_EPOCH
-                .checked_add(duration)
-                .unwrap_or(SystemTime::now())
+pub struct MyServer {
+    ds: Arc<Store>,
+    tx: Sender<NodeUpdate>,
 }
-        None => SystemTime::now(),
-    };
-    database::add_node(ip.to_string(), NodeInfo { pubkey, updated_at });
 
-    database::add_key(pubkey, privkey);
+impl MyServer {
+    fn init(ds: Arc<Store>, tx: Sender<NodeUpdate>) -> Self {
+        Self { ds, tx }
+    }
+
+    fn start(self) -> JoinHandle<()> {
+        std::thread::spawn(|| {
+            tokio::runtime::Runtime::new().unwrap().block_on(async {
+                let addr = "0.0.0.0:31373".parse().unwrap();
+                if let Err(e) = Server::builder()
+                    .add_service(challenge::update_server::UpdateServer::new(self))
+                    .serve(addr)
+                    .await
+                {
+                    println!("gRPC server failed: {e:?}");
+                };
+            });
+        })
+    }
 }
 
 #[tonic::async_trait]
-impl KeyDistribution for MyKeyDistribution {
-    async fn update_key(&self, request: Request<UpdateKeyReq>) -> Result<Response<()>, Status> {
-        let ip = request.remote_addr().unwrap().ip();
-        let req = request.into_inner();
-        update_db(ip.to_string(), req.keypair, req.updated_at);
-        Ok(Response::new(()))
-    }
+impl challenge::update_server::Update for MyServer {
+    type GetUpdatesStream = Pin<Box<dyn Stream<Item = Result<NodeUpdate, Status>> + Send>>;
 
-    async fn update_node(&self, request: Request<UpdateNodeReq>) -> Result<Response<()>, Status> {
-        let req = request.into_inner();
-        update_db(req.ip, req.keypair, req.updated_at);
-        Ok(Response::new(()))
-    }
+    async fn get_updates(
+        &self,
+        req: Request<Streaming<NodeUpdate>>,
+    ) -> Result<Response<Self::GetUpdatesStream>, Status> {
+        let remote_ip = req.remote_addr().unwrap().ip().to_string();
+        let tx = self.tx.clone();
+        let mut rx = self.tx.subscribe();
+        let mut inbound = req.into_inner();
 
-    async fn remove_node(&self, _request: Request<RemoveNodeReq>) -> Result<Response<()>, Status> {
-        // Handle RemoveNode request
-        Ok(Response::new(()))
-    }
-}
-
-async fn start_client() {
+        let stream = async_stream::stream! {
             loop {
-        tokio::time::sleep(Duration::from_secs(10)).await;
+                tokio::select! {
+                    Some(msg) = inbound.next() => {
+                        match msg {
+                            Ok(update) => {
+                                if let Err(_) = tx.send(update.clone()) {
+                                    yield Err(Status::internal("Failed to broadcast update"));
+                                }
+                            }
+                            Err(e) => {
+                                yield Err(Status::internal(format!("Error receiving client stream: {}", e)));
+                                break;
+                            }
+                        }
+                    }
+                    Ok(update) = rx.recv() => {
+                        if update.ip != remote_ip {
+                            yield Ok(update);
                         }
                     }
 
-async fn start_server() {
-    let addr = "0.0.0.0:31373".parse().unwrap();
-    let key_distribution = MyKeyDistribution::default();
-    Server::builder()
-        .add_service(KeyDistributionServer::new(key_distribution))
-        .serve(addr)
-        .await
-        .unwrap();
                 }
+            }
+        };
 
-pub async fn start() {
-    let start_client = tokio::task::spawn(start_server());
-    let start_server = tokio::task::spawn(start_server());
-    futures::future::select(start_client, start_server).await;
+        Ok(Response::new(Box::pin(stream) as Self::GetUpdatesStream))
     }
-
-pub fn add_node(ip: String) {
-    let mut csprng = OsRng;
-    let privkey = ed25519_dalek::SigningKey::generate(&mut csprng);
-    database::add_node(
-        ip,
-        NodeInfo {
-            pubkey: privkey.verifying_key(),
-            updated_at: std::time::SystemTime::now(),
-        },
-    );
-    database::add_key(privkey.verifying_key(), privkey);
 }

src/main.rs

@@ -1,3 +1,4 @@
+mod grpc;
 mod datastore;
 mod http_server;
 use crate::datastore::Store;