p2p: WIP rpc server implementation for the p2p monitor

13 files changed, 2800 insertions, 182 deletions

diff --git a/p2p/Cargo.toml b/p2p/Cargo.toml
index fe46953..9dd43d5 100644
--- a/p2p/Cargo.toml
+++ b/p2p/Cargo.toml
@@ -13,8 +13,9 @@ authors.workspace = true
 
 [features]
 default = ["smol"]
-smol = ["karyon_core/smol", "karyon_net/smol", "dep:futures-rustls"]
-tokio = ["karyon_core/tokio", "karyon_net/tokio", "dep:tokio-rustls"]
+smol = ["karyon_core/smol", "karyon_net/smol", "futures-rustls"]
+tokio = ["karyon_core/tokio", "karyon_net/tokio", "tokio-rustls"]
+serde = ["dep:serde", "karyon_net/serde"]
 
 [dependencies]
 karyon_core = { workspace = true, features = [
@@ -48,6 +49,10 @@ futures-rustls = { version = "0.25.1", features = [
 ], optional = true }
 tokio-rustls = { version = "0.26.0", features = ["aws-lc-rs"], optional = true }
 rustls-pki-types = "1.7.0"
+
+# serde
+serde = { version = "1.0.197", features = ["derive"], optional = true }
+
 parking_lot = "0.12.2"
 
 [dev-dependencies]
diff --git a/p2p/examples/chat.rs b/p2p/examples/chat.rs
index d120f50..d162371 100644
--- a/p2p/examples/chat.rs
+++ b/p2p/examples/chat.rs
@@ -11,7 +11,7 @@ use karyon_p2p::{
     endpoint::{Endpoint, Port},
     keypair::{KeyPair, KeyPairType},
     protocol::{ArcProtocol, Protocol, ProtocolEvent, ProtocolID},
-    ArcPeer, Backend, Config, P2pError, Version,
+    ArcPeer, Backend, Config, Error, Version,
 };
 
 use shared::run_executor;
@@ -58,7 +58,7 @@ impl ChatProtocol {
 
 #[async_trait]
 impl Protocol for ChatProtocol {
-    async fn start(self: Arc<Self>) -> Result<(), P2pError> {
+    async fn start(self: Arc<Self>) -> Result<(), Error> {
         let selfc = self.clone();
         let stdin = io::stdin();
         let task = self.executor.spawn(async move {
@@ -90,7 +90,7 @@ impl Protocol for ChatProtocol {
         Ok(())
     }
 
-    fn version() -> Result<Version, P2pError> {
+    fn version() -> Result<Version, Error> {
         "0.1.0, 0.1.0".parse()
     }
 
diff --git a/p2p/examples/monitor/.gitignore b/p2p/examples/monitor/.gitignore
new file mode 100644
index 0000000..eb5a316
--- /dev/null
+++ b/p2p/examples/monitor/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/p2p/examples/monitor/Cargo.lock b/p2p/examples/monitor/Cargo.lock
new file mode 100644
index 0000000..cfb7934
--- /dev/null
+++ b/p2p/examples/monitor/Cargo.lock
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+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.5",
+ "windows_aarch64_msvc 0.52.5",
+ "windows_i686_gnu 0.52.5",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc 0.52.5",
+ "windows_x86_64_gnu 0.52.5",
+ "windows_x86_64_gnullvm 0.52.5",
+ "windows_x86_64_msvc 0.52.5",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+
+[[package]]
+name = "x509-parser"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcbc162f30700d6f3f82a24bf7cc62ffe7caea42c0b2cba8bf7f3ae50cf51f69"
+dependencies = [
+ "asn1-rs",
+ "data-encoding",
+ "der-parser",
+ "lazy_static",
+ "nom",
+ "oid-registry",
+ "rusticata-macros",
+ "thiserror",
+ "time",
+]
+
+[[package]]
+name = "yasna"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e17bb3549cc1321ae1296b9cdc2698e2b6cb1992adfa19a8c72e5b7a738f44cd"
+dependencies = [
+ "time",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.66",
+]
diff --git a/p2p/examples/monitor/Cargo.toml b/p2p/examples/monitor/Cargo.toml
new file mode 100644
index 0000000..b323ed1
--- /dev/null
+++ b/p2p/examples/monitor/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "monitor"
+version = "0.1.0"
+edition = "2021"
+
+[workspace]
+
+[dependencies]
+karyon_core = { path = "../../../core", features = ["crypto"] }
+karyon_p2p = { path = "../../", features = ["serde"] }
+karyon_jsonrpc = { path = "../../../jsonrpc", features = ["ws"] }
+clap = { version = "4.5.4", features = ["derive"] }
+ctrlc = "3.4.4"
+env_logger = "0.11.3"
+log = "0.4.21"
+serde = { version = "1.0.203", features = ["derive"] }
+smol = "2.0.0"
+serde_json = "1.0.117"
+easy-parallel = "3.3.1"
+ringbuffer = "0.15.0"
+
+[[bin]]
+name = "client"
+path = "src/client.rs"
+
+[[bin]]
+name = "monitor"
+path = "src/main.rs"
+
diff --git a/p2p/examples/monitor/src/client.rs b/p2p/examples/monitor/src/client.rs
new file mode 100644
index 0000000..d4970eb
--- /dev/null
+++ b/p2p/examples/monitor/src/client.rs
@@ -0,0 +1,48 @@
+use clap::Parser;
+
+use karyon_jsonrpc::Client;
+use karyon_p2p::endpoint::Endpoint;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    /// RPC server endpoint.
+    #[arg(short)]
+    rpc_endpoint: Endpoint,
+}
+
+fn main() {
+    smol::block_on(async {
+        env_logger::init();
+        let cli = Cli::parse();
+
+        let rpc = Client::builder(cli.rpc_endpoint)
+            .expect("Create rpc client builder")
+            .build()
+            .await
+            .expect("Create rpc client");
+
+        let (_, sub) = rpc
+            .subscribe("MonitorRPC.conn_subscribe", ())
+            .await
+            .expect("Subscribe to connection events");
+
+        let (_, sub2) = rpc
+            .subscribe("MonitorRPC.peer_pool_subscribe", ())
+            .await
+            .expect("Subscribe to peer pool events");
+
+        smol::spawn(async move {
+            loop {
+                let _event = sub.recv().await.expect("Receive connection event");
+            }
+        })
+        .detach();
+
+        smol::spawn(async move {
+            loop {
+                let _event = sub2.recv().await.expect("Receive peer pool event");
+            }
+        }).await;
+    });
+}
diff --git a/p2p/examples/monitor.rs b/p2p/examples/monitor/src/main.rs
index cda8972..636d652 100644
--- a/p2p/examples/monitor.rs
+++ b/p2p/examples/monitor/src/main.rs
@@ -4,20 +4,23 @@ use std::sync::Arc;
 
 use clap::Parser;
 use log::error;
+use ringbuffer::{AllocRingBuffer, RingBuffer};
 use serde::{Deserialize, Serialize};
-use smol::{channel, Executor};
+use smol::{channel, lock::Mutex, Executor};
 
+use karyon_core::async_util::{CondWait, TaskGroup, TaskResult};
+use karyon_jsonrpc::{rpc_impl, rpc_pubsub_impl, ArcChannel, Server, Subscription, SubscriptionID};
 use karyon_p2p::{
     endpoint::{Endpoint, Port},
     keypair::{KeyPair, KeyPairType},
     monitor::{ConnEvent, DiscoveryEvent, PeerPoolEvent},
-    ArcBackend, Backend, Config,
+    ArcBackend, Backend, Config, Error, Result,
 };
 
-use karyon_jsonrpc::{rpc_impl, rpc_pubsub_impl, ArcChannel, Server, SubscriptionID};
-
 use shared::run_executor;
 
+const EVENT_BUFFER_SIZE: usize = 30;
+
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
 struct Cli {
@@ -44,6 +47,87 @@ struct Cli {
 
 struct MonitorRPC {
     backend: ArcBackend,
+    conn_event_buffer: Arc<Mutex<AllocRingBuffer<ConnEvent>>>,
+    pp_event_buffer: Arc<Mutex<AllocRingBuffer<PeerPoolEvent>>>,
+    discv_event_buffer: Arc<Mutex<AllocRingBuffer<DiscoveryEvent>>>,
+    conn_event_condvar: Arc<CondWait>,
+    pp_event_condvar: Arc<CondWait>,
+    discv_event_condvar: Arc<CondWait>,
+    task_group: TaskGroup,
+}
+
+impl MonitorRPC {
+    fn new(backend: ArcBackend, ex: Arc<Executor<'static>>) -> Arc<Self> {
+        Arc::new(MonitorRPC {
+            backend,
+            conn_event_buffer: Arc::new(Mutex::new(AllocRingBuffer::new(EVENT_BUFFER_SIZE))),
+            pp_event_buffer: Arc::new(Mutex::new(AllocRingBuffer::new(EVENT_BUFFER_SIZE))),
+            discv_event_buffer: Arc::new(Mutex::new(AllocRingBuffer::new(EVENT_BUFFER_SIZE))),
+            conn_event_condvar: Arc::new(CondWait::new()),
+            pp_event_condvar: Arc::new(CondWait::new()),
+            discv_event_condvar: Arc::new(CondWait::new()),
+            task_group: TaskGroup::with_executor(ex.into()),
+        })
+    }
+
+    async fn run(&self) -> Result<()> {
+        let conn_events = self.backend.monitor().conn_events().await;
+        let peer_pool_events = self.backend.monitor().peer_pool_events().await;
+        let discovery_events = self.backend.monitor().discovery_events().await;
+
+        let conn_event_buffer = self.conn_event_buffer.clone();
+        let pp_event_buffer = self.pp_event_buffer.clone();
+        let discv_event_buffer = self.discv_event_buffer.clone();
+
+        let conn_event_condvar = self.conn_event_condvar.clone();
+        let pp_event_condvar = self.pp_event_condvar.clone();
+        let discv_event_condvar = self.discv_event_condvar.clone();
+
+        let on_failuer = |res: TaskResult<Result<()>>| async move {
+            if let TaskResult::Completed(Err(err)) = res {
+                error!("Event receive loop: {err}")
+            }
+        };
+
+        self.task_group.spawn(
+            async move {
+                loop {
+                    let event = conn_events.recv().await?;
+                    conn_event_buffer.lock().await.push(event);
+                    conn_event_condvar.broadcast().await;
+                }
+            },
+            on_failuer,
+        );
+
+        self.task_group.spawn(
+            async move {
+                loop {
+                    let event = peer_pool_events.recv().await?;
+                    pp_event_buffer.lock().await.push(event);
+                    pp_event_condvar.broadcast().await;
+                }
+            },
+            on_failuer,
+        );
+
+        self.task_group.spawn(
+            async move {
+                loop {
+                    let event = discovery_events.recv().await?;
+                    discv_event_buffer.lock().await.push(event);
+                    discv_event_condvar.broadcast().await;
+                }
+            },
+            on_failuer,
+        );
+
+        Ok(())
+    }
+
+    async fn shutdown(&self) {
+        self.task_group.cancel().await;
+    }
 }
 
 #[rpc_impl]
@@ -51,22 +135,22 @@ impl MonitorRPC {
     async fn peer_id(
         &self,
         _params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         Ok(serde_json::json!(self.backend.peer_id().to_string()))
     }
 
     async fn inbound_connection(
         &self,
         _params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         Ok(serde_json::json!(self.backend.inbound_slots()))
     }
 
     async fn outbound_connection(
         &self,
         _params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
-        Ok(serde_json::json!(self.backend.inbound_slots()))
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
+        Ok(serde_json::json!(self.backend.outbound_slots()))
     }
 }
 
@@ -77,21 +161,14 @@ impl MonitorRPC {
         chan: ArcChannel,
         method: String,
         _params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         let sub = chan.new_subscription(&method).await;
         let sub_id = sub.id.clone();
-        let conn_events = self.backend.monitor().conn_events().await;
-        smol::spawn(async move {
-            loop {
-                let event = conn_events.recv().await.unwrap();
-                let event: ConnEventJson = event.into();
-                if let Err(err) = sub.notify(serde_json::json!(event)).await {
-                    error!("Failed to notify: {err}");
-                    break;
-                }
-            }
-        })
-        .detach();
+
+        let cond_wait = self.conn_event_condvar.clone();
+        let buffer = self.conn_event_buffer.clone();
+        self.task_group
+            .spawn(notify(sub, cond_wait, buffer), notify_failed);
 
         Ok(serde_json::json!(sub_id))
     }
@@ -101,21 +178,14 @@ impl MonitorRPC {
         chan: ArcChannel,
         method: String,
         _params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         let sub = chan.new_subscription(&method).await;
         let sub_id = sub.id.clone();
-        let peer_pool_events = self.backend.monitor().peer_pool_events().await;
-        smol::spawn(async move {
-            loop {
-                let event = peer_pool_events.recv().await.unwrap();
-                let event: PeerPoolEventJson = event.into();
-                if let Err(err) = sub.notify(serde_json::json!(event)).await {
-                    error!("Failed to notify: {err}");
-                    break;
-                }
-            }
-        })
-        .detach();
+
+        let cond_wait = self.pp_event_condvar.clone();
+        let buffer = self.pp_event_buffer.clone();
+        self.task_group
+            .spawn(notify(sub, cond_wait, buffer), notify_failed);
 
         Ok(serde_json::json!(sub_id))
     }
@@ -125,21 +195,14 @@ impl MonitorRPC {
         chan: ArcChannel,
         method: String,
         _params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         let sub = chan.new_subscription(&method).await;
         let sub_id = sub.id.clone();
-        let discovery_events = self.backend.monitor().discovery_events().await;
-        smol::spawn(async move {
-            loop {
-                let event = discovery_events.recv().await.unwrap();
-                let event: DiscoveryEventJson = event.into();
-                if let Err(err) = sub.notify(serde_json::json!(event)).await {
-                    error!("Failed to notify: {err}");
-                    break;
-                }
-            }
-        })
-        .detach();
+
+        let cond_wait = self.discv_event_condvar.clone();
+        let buffer = self.discv_event_buffer.clone();
+        self.task_group
+            .spawn(notify(sub, cond_wait, buffer), notify_failed);
 
         Ok(serde_json::json!(sub_id))
     }
@@ -149,7 +212,7 @@ impl MonitorRPC {
         chan: ArcChannel,
         _method: String,
         params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         let sub_id: SubscriptionID = serde_json::from_value(params)?;
         chan.remove_subscription(&sub_id).await;
         Ok(serde_json::json!(true))
@@ -160,7 +223,7 @@ impl MonitorRPC {
         chan: ArcChannel,
         _method: String,
         params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         let sub_id: SubscriptionID = serde_json::from_value(params)?;
         chan.remove_subscription(&sub_id).await;
         Ok(serde_json::json!(true))
@@ -171,7 +234,7 @@ impl MonitorRPC {
         chan: ArcChannel,
         _method: String,
         params: serde_json::Value,
-    ) -> Result<serde_json::Value, karyon_jsonrpc::Error> {
+    ) -> karyon_jsonrpc::Result<serde_json::Value> {
         let sub_id: SubscriptionID = serde_json::from_value(params)?;
         chan.remove_subscription(&sub_id).await;
         Ok(serde_json::json!(true))
@@ -208,15 +271,13 @@ fn main() {
     run_executor(
         async {
             // RPC service
-            let service = Arc::new(MonitorRPC {
-                backend: backend.clone(),
-            });
+            let service = MonitorRPC::new(backend.clone(), exc.clone());
 
             // Create rpc server
             let server = Server::builder(cli.rpc_endpoint)
                 .expect("Create server builder")
                 .service(service.clone())
-                .pubsub_service(service)
+                .pubsub_service(service.clone())
                 .build_with_executor(exc.clone().into())
                 .await
                 .expect("Build rpc server");
@@ -224,6 +285,9 @@ fn main() {
             // Run the RPC server
             server.start().await;
 
+            // Run the RPC Service
+            service.run().await.expect("Run monitor rpc service");
+
             // Run the backend
             backend.run().await.expect("Run p2p backend");
 
@@ -235,105 +299,37 @@ fn main() {
 
             // Shutdown the RPC server
             server.shutdown().await;
+
+            // Shutdown the RPC service
+            service.shutdown().await;
         },
         ex,
     );
 }
 
-#[derive(Debug, Serialize, Deserialize)]
-struct ConnEventJson {
-    name: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    endpoint: Option<String>,
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-struct PeerPoolEventJson {
-    name: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    peer_id: Option<String>,
-}
-
-#[derive(Debug, Serialize, Deserialize)]
-struct DiscoveryEventJson {
-    name: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    endpoint: Option<String>,
-}
-
-impl From<ConnEvent> for ConnEventJson {
-    fn from(item: ConnEvent) -> Self {
-        match item {
-            ConnEvent::Connected(ref e) => ConnEventJson {
-                name: "Connected".into(),
-                endpoint: Some(e.to_string()),
-            },
-            ConnEvent::Disconnected(e) => ConnEventJson {
-                name: "Disconnected".into(),
-                endpoint: Some(e.to_string()),
-            },
-            ConnEvent::ConnectFailed(e) => ConnEventJson {
-                name: "ConnectFailed".into(),
-                endpoint: Some(e.to_string()),
-            },
-            ConnEvent::ConnectRetried(e) => ConnEventJson {
-                name: "ConnectRetried".into(),
-                endpoint: Some(e.to_string()),
-            },
-            ConnEvent::Accepted(e) => ConnEventJson {
-                name: "Accepted".into(),
-                endpoint: Some(e.to_string()),
-            },
-            ConnEvent::AcceptFailed => ConnEventJson {
-                name: "AcceptFailed".into(),
-                endpoint: None,
-            },
-            ConnEvent::Listening(e) => ConnEventJson {
-                name: "Listening".into(),
-                endpoint: Some(e.to_string()),
-            },
-            ConnEvent::ListenFailed(e) => ConnEventJson {
-                name: "ListenFailed".into(),
-                endpoint: Some(e.to_string()),
-            },
+async fn notify<T: Serialize + Deserialize<'static> + Clone>(
+    sub: Subscription,
+    cond_wait: Arc<CondWait>,
+    buffer: Arc<Mutex<AllocRingBuffer<T>>>,
+) -> Result<()> {
+    for event in buffer.lock().await.iter() {
+        if let Err(err) = sub.notify(serde_json::json!(event)).await {
+            return Err(Error::Other(format!("failed to notify: {err}")));
         }
     }
-}
-
-impl From<PeerPoolEvent> for PeerPoolEventJson {
-    fn from(item: PeerPoolEvent) -> Self {
-        match item {
-            PeerPoolEvent::NewPeer(id) => PeerPoolEventJson {
-                name: "NewPeer".into(),
-                peer_id: Some(id.to_string()),
-            },
-            PeerPoolEvent::RemovePeer(id) => PeerPoolEventJson {
-                name: "RemovePeer".into(),
-                peer_id: Some(id.to_string()),
-            },
+    loop {
+        cond_wait.wait().await;
+        cond_wait.reset().await;
+        if let Some(event) = buffer.lock().await.back().cloned() {
+            if let Err(err) = sub.notify(serde_json::json!(event)).await {
+                return Err(Error::Other(format!("failed to notify: {err}")));
+            }
         }
     }
 }
 
-impl From<DiscoveryEvent> for DiscoveryEventJson {
-    fn from(item: DiscoveryEvent) -> Self {
-        match item {
-            DiscoveryEvent::RefreshStarted => DiscoveryEventJson {
-                name: "RefreshStarted".into(),
-                endpoint: None,
-            },
-            DiscoveryEvent::LookupStarted(e) => DiscoveryEventJson {
-                name: "LookupStarted".into(),
-                endpoint: Some(e.to_string()),
-            },
-            DiscoveryEvent::LookupFailed(e) => DiscoveryEventJson {
-                name: "LookupFailed".into(),
-                endpoint: Some(e.to_string()),
-            },
-            DiscoveryEvent::LookupSucceeded(e, _) => DiscoveryEventJson {
-                name: "LookupSucceeded".into(),
-                endpoint: Some(e.to_string()),
-            },
-        }
+async fn notify_failed(result: TaskResult<Result<()>>) {
+    if let TaskResult::Completed(Err(err)) = result {
+        error!("Error: {err}");
     }
 }
diff --git a/p2p/examples/monitor/src/shared.rs b/p2p/examples/monitor/src/shared.rs
new file mode 100644
index 0000000..0e8079c
--- /dev/null
+++ b/p2p/examples/monitor/src/shared.rs
@@ -0,0 +1,31 @@
+use std::{num::NonZeroUsize, sync::Arc, thread};
+
+use easy_parallel::Parallel;
+use smol::{channel, future, future::Future, Executor};
+
+/// Returns an estimate of the default amount of parallelism a program should use.
+/// see `std::thread::available_parallelism`
+pub fn available_parallelism() -> usize {
+    thread::available_parallelism()
+        .map(NonZeroUsize::get)
+        .unwrap_or(1)
+}
+
+/// Run a multi-threaded executor
+pub fn run_executor<T>(main_future: impl Future<Output = T>, ex: Arc<Executor<'_>>) {
+    let (signal, shutdown) = channel::unbounded::<()>();
+
+    let num_threads = available_parallelism();
+
+    Parallel::new()
+        .each(0..(num_threads), |_| {
+            future::block_on(ex.run(shutdown.recv()))
+        })
+        // Run the main future on the current thread.
+        .finish(|| {
+            future::block_on(async {
+                main_future.await;
+                drop(signal);
+            })
+        });
+}
diff --git a/p2p/examples/tokio-example/Cargo.lock b/p2p/examples/tokio-example/Cargo.lock
index 990ec35..21a1c63 100644
--- a/p2p/examples/tokio-example/Cargo.lock
+++ b/p2p/examples/tokio-example/Cargo.lock
@@ -167,19 +167,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "asynchronous-codec"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a860072022177f903e59730004fb5dc13db9275b79bb2aef7ba8ce831956c233"
-dependencies = [
- "bytes",
- "futures-sink",
- "futures-util",
- "memchr",
- "pin-project-lite",
-]
-
-[[package]]
 name = "autocfg"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -722,17 +709,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a44623e20b9681a318efdd71c299b6b222ed6f231972bfe2f224ebad6311f0c1"
 
 [[package]]
-name = "futures-macro"
-version = "0.3.30"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
 name = "futures-sink"
 version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -751,11 +727,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
 dependencies = [
  "futures-core",
- "futures-io",
- "futures-macro",
  "futures-sink",
  "futures-task",
- "memchr",
  "pin-project-lite",
  "pin-utils",
  "slab",
@@ -921,6 +894,7 @@ dependencies = [
  "ed25519-dalek",
  "log",
  "once_cell",
+ "parking_lot",
  "pin-project-lite",
  "rand",
  "thiserror",
@@ -934,7 +908,6 @@ dependencies = [
  "async-channel",
  "async-trait",
  "async-tungstenite",
- "asynchronous-codec",
  "bincode",
  "futures-util",
  "karyon_core",
@@ -959,6 +932,7 @@ dependencies = [
  "karyon_core",
  "karyon_net",
  "log",
+ "parking_lot",
  "rand",
  "rcgen",
  "rustls-pki-types",
diff --git a/p2p/src/lib.rs b/p2p/src/lib.rs
index 546353a..ebc51d8 100644
--- a/p2p/src/lib.rs
+++ b/p2p/src/lib.rs
@@ -63,7 +63,6 @@ pub mod protocol;
 
 pub use backend::{ArcBackend, Backend};
 pub use config::Config;
-pub use error::Error as P2pError;
 pub use peer::{ArcPeer, PeerID};
 pub use version::Version;
 
@@ -75,4 +74,4 @@ pub mod keypair {
     pub use karyon_core::crypto::{KeyPair, KeyPairType, PublicKey, SecretKey};
 }
 
-use error::{Error, Result};
+pub use error::{Error, Result};
diff --git a/p2p/src/monitor.rs b/p2p/src/monitor.rs
index b7afb7c..4d6a46c 100644
--- a/p2p/src/monitor.rs
+++ b/p2p/src/monitor.rs
@@ -4,6 +4,9 @@ use karyon_core::event::{ArcEventSys, EventListener, EventSys, EventValue, Event
 
 use karyon_net::Endpoint;
 
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
 use crate::{Config, PeerID};
 
 /// Responsible for network and system monitoring.
@@ -37,7 +40,6 @@ use crate::{Config, PeerID};
 /// ```
 pub struct Monitor {
     event_sys: ArcEventSys<MonitorTopic>,
-
     config: Arc<Config>,
 }
 
@@ -77,6 +79,7 @@ impl Monitor {
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum MonitorTopic {
     Conn,
     PeerPool,
@@ -85,6 +88,7 @@ pub enum MonitorTopic {
 
 /// Defines connection-related events.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum ConnEvent {
     Connected(Endpoint),
     ConnectRetried(Endpoint),
@@ -98,6 +102,7 @@ pub enum ConnEvent {
 
 /// Defines `PeerPool` events.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum PeerPoolEvent {
     NewPeer(PeerID),
     RemovePeer(PeerID),
@@ -105,6 +110,7 @@ pub enum PeerPoolEvent {
 
 /// Defines `Discovery` events.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum DiscoveryEvent {
     LookupStarted(Endpoint),
     LookupFailed(Endpoint),
diff --git a/p2p/src/peer/peer_id.rs b/p2p/src/peer/peer_id.rs
index f907aa7..a769c86 100644
--- a/p2p/src/peer/peer_id.rs
+++ b/p2p/src/peer/peer_id.rs
@@ -2,12 +2,16 @@ use bincode::{Decode, Encode};
 use rand::{rngs::OsRng, RngCore};
 use sha2::{Digest, Sha256};
 
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
 use karyon_core::crypto::PublicKey;
 
 use crate::Error;
 
 /// Represents a unique identifier for a peer.
 #[derive(Clone, Debug, Eq, PartialEq, Hash, Decode, Encode)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct PeerID(pub [u8; 32]);
 
 impl std::fmt::Display for PeerID {
diff --git a/p2p/src/protocol.rs b/p2p/src/protocol.rs
index 951040b..d42f092 100644
--- a/p2p/src/protocol.rs
+++ b/p2p/src/protocol.rs
@@ -39,7 +39,7 @@ impl EventValue for ProtocolEvent {
 ///
 /// use karyon_p2p::{
 ///     protocol::{ArcProtocol, Protocol, ProtocolID, ProtocolEvent},
-///     Backend, PeerID, Config, Version, P2pError, ArcPeer,
+///     Backend, PeerID, Config, Version, Error, ArcPeer,
 ///     keypair::{KeyPair, KeyPairType},
 ///     };
 ///
@@ -57,7 +57,7 @@ impl EventValue for ProtocolEvent {
 ///
 /// #[async_trait]
 /// impl Protocol for NewProtocol {
-///     async fn start(self: Arc<Self>) -> Result<(), P2pError> {
+///     async fn start(self: Arc<Self>) -> Result<(), Error> {
 ///         let listener = self.peer.register_listener::<Self>().await;
 ///         loop {
 ///             let event = listener.recv().await.unwrap();
@@ -76,7 +76,7 @@ impl EventValue for ProtocolEvent {
 ///         Ok(())
 ///     }
 ///
-///     fn version() -> Result<Version, P2pError> {
+///     fn version() -> Result<Version, Error> {
 ///         "0.2.0, >0.1.0".parse()
 ///     }
 ///