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use parking_lot::Mutex;
use reflow_tracing_protocol::client::TracingIntegration;
use crate::{
actor::{Actor, ActorConfig, ActorContext, ActorLoad, MemoryState, Port},
bridge::NetworkBridge,
message::Message,
};
use std::{collections::HashMap, sync::Arc, time::Duration};
/// Default timeout for forwarding messages to remote actors.
const PROXY_FORWARD_TIMEOUT: Duration = Duration::from_secs(30);
/// Proxy actor that represents a remote actor in the local network.
///
/// When a message arrives on any inport, the proxy forwards it to the remote actor
/// via the network bridge. The result map includes either:
/// - `"status"` → `"forwarded"` on success
/// - `"error"` → error description on failure (timeout, connection loss, etc.)
pub struct RemoteActorProxy {
proxy_id: String,
remote_network_id: String,
remote_actor_id: String,
bridge: Arc<NetworkBridge>,
inports: Port,
outports: Port,
load: Arc<ActorLoad>,
}
impl RemoteActorProxy {
pub fn new(
remote_network_id: String,
remote_actor_id: String,
bridge: Arc<NetworkBridge>,
) -> Self {
let proxy_id = format!("{}@{}", remote_actor_id, remote_network_id);
RemoteActorProxy {
proxy_id,
remote_network_id,
remote_actor_id,
bridge,
inports: flume::unbounded(),
outports: flume::unbounded(),
load: Arc::new(ActorLoad::new(0)),
}
}
}
impl Actor for RemoteActorProxy {
fn get_behavior(&self) -> crate::actor::ActorBehavior {
let bridge = self.bridge.clone();
let remote_network_id = self.remote_network_id.clone();
let remote_actor_id = self.remote_actor_id.clone();
let proxy_id = self.proxy_id.clone();
Box::new(move |context| {
let payload = context.get_payload().clone();
let bridge = bridge.clone();
let remote_network_id = remote_network_id.clone();
let remote_actor_id = remote_actor_id.clone();
let proxy_id = proxy_id.clone();
Box::pin(async move {
let mut result = HashMap::new();
let mut had_error = false;
// Forward all input messages to remote actor
for (port, message) in payload.iter() {
tracing::info!(
"[PROXY {}] Forwarding to {}::{} on port {}",
proxy_id,
remote_network_id,
remote_actor_id,
port
);
let send_future = bridge.send_remote_message(
&remote_network_id,
&remote_actor_id,
port,
message.clone(),
Some(&proxy_id),
);
// Wrap the send with a timeout to prevent indefinite hangs
match tokio::time::timeout(PROXY_FORWARD_TIMEOUT, send_future).await {
Ok(Ok(_)) => {
tracing::info!(
"[PROXY {}] Successfully forwarded to remote actor",
proxy_id
);
}
Ok(Err(e)) => {
tracing::error!(
"[PROXY {}] Failed to forward to remote actor: {}",
proxy_id,
e
);
had_error = true;
result.insert(
"error".to_string(),
Message::String(Arc::new(format!(
"proxy:{}: forward failed: {}",
proxy_id, e
))),
);
}
Err(_) => {
tracing::error!(
"[PROXY {}] Timed out forwarding to {}::{} ({}s)",
proxy_id,
remote_network_id,
remote_actor_id,
PROXY_FORWARD_TIMEOUT.as_secs()
);
had_error = true;
result.insert(
"error".to_string(),
Message::String(Arc::new(format!(
"proxy:{}: forward timed out after {}s",
proxy_id,
PROXY_FORWARD_TIMEOUT.as_secs()
))),
);
}
}
}
if !had_error {
result.insert(
"status".to_string(),
Message::String(Arc::new("forwarded".to_string())),
);
}
Ok(result)
})
})
}
fn get_inports(&self) -> Port {
self.inports.clone()
}
fn get_outports(&self) -> Port {
self.outports.clone()
}
fn load_count(&self) -> Arc<ActorLoad> {
self.load.clone()
}
fn create_process(
&self,
config: ActorConfig,
_tracing_integration: Option<TracingIntegration>,
) -> std::pin::Pin<Box<dyn futures::Future<Output = ()> + 'static + Send>> {
use futures::StreamExt;
let behavior = self.get_behavior();
let (_, receiver) = self.get_inports();
let outports = self.get_outports();
let load = self.load_count();
Box::pin(async move {
loop {
if let Some(packet) = receiver.clone().stream().next().await {
let context = ActorContext::new(
packet,
outports.clone(),
Arc::new(Mutex::new(MemoryState::default())),
config.clone(),
load.clone(),
);
match behavior(context).await {
Ok(result) if !result.is_empty() => {
outports
.0
.send(result)
.expect("Expected to send message via outport");
load.reset();
}
Err(e) => {
tracing::error!("[PROXY] Behavior error: {}", e);
// Propagate error as output so downstream actors are notified
let mut error_result = HashMap::new();
error_result.insert(
"error".to_string(),
Message::String(Arc::new(format!("proxy behavior error: {}", e))),
);
let _ = outports.0.send(error_result);
load.reset();
}
_ => {}
}
}
}
})
}
}