[manager] fix address when binding to 0 (#67)

src/lib.rs

@@ -41,7 +41,7 @@ impl Manager {
         py: Python<'_>,
         replica_id: String,
         lighthouse_addr: String,
-        address: String,
+        hostname: String,
         bind: String,
         store_addr: String,
         world_size: u64,
@@ -52,7 +52,7 @@ impl Manager {
                 .block_on(manager::Manager::new(
                     replica_id,
                     lighthouse_addr,
-                    address,
+                    hostname,
                     bind,
                     store_addr,
                     world_size,

src/manager.rs

@@ -11,7 +11,6 @@ use std::sync::Arc;
 use std::time::Duration;
 
 use anyhow::Result;
-use gethostname::gethostname;
 use tokio::sync::broadcast;
 use tokio::sync::Mutex;
 use tokio::task::JoinSet;
@@ -53,7 +52,7 @@ struct ManagerState {
 pub struct Manager {
     replica_id: String,
     lighthouse_addr: String,
-    address: String,
+    hostname: String,
     store_address: String,
     world_size: u64,
     state: Mutex<ManagerState>,
@@ -80,19 +79,20 @@ impl Manager {
     pub async fn new(
         replica_id: String,
         lighthouse_addr: String,
-        address: String,
+        hostname: String,
         bind: String,
         store_addr: String,
         world_size: u64,
     ) -> Result<Arc<Self>> {
         let listener = tokio::net::TcpListener::bind(&bind).await?;
+        let local_addr = listener.local_addr()?;
 
         let (should_commit_tx, _) = broadcast::channel(16);
 
         Ok(Arc::new(Self {
             replica_id: replica_id,
             lighthouse_addr: lighthouse_addr,
-            address: address,
+            hostname: hostname,
             store_address: store_addr,
             world_size: world_size,
             state: Mutex::new(ManagerState {
@@ -103,7 +103,7 @@ impl Manager {
                 should_commit_count: HashSet::new(),
                 should_commit_failures: HashSet::new(),
             }),
-            local_addr: listener.local_addr()?,
+            local_addr: local_addr,
             listener: Mutex::new(Some(listener)),
         }))
     }
@@ -122,11 +122,7 @@ impl Manager {
     }
 
     pub fn address(&self) -> String {
-        format!(
-            "http://{}:{}",
-            gethostname().into_string().unwrap(),
-            self.local_addr.port()
-        )
+        format!("http://{}:{}", self.hostname, self.local_addr.port())
     }
 
     async fn _run_grpc(self: Arc<Self>) -> Result<()> {
@@ -228,7 +224,7 @@ impl ManagerService for Arc<Manager> {
                     room_id: room_id.clone(),
                     requester: Some(QuorumMember {
                         replica_id: self.replica_id.clone(),
-                        address: self.address.clone(),
+                        address: self.address(),
                         store_address: self.store_address.clone(),
                         step: req.step,
                         world_size: self.world_size,
@@ -470,7 +466,7 @@ mod tests {
         let manager = Manager::new(
             "rep_id".to_string(),
             lighthouse.address(),
-            "addr".to_string(),
+            "localhost".to_string(),
             "[::]:0".to_string(),
             "store_addr".to_string(),
             1, // world size
@@ -493,7 +489,7 @@ mod tests {
         lighthouse_fut.abort();
 
         assert_eq!(resp.quorum_id, 1);
-        assert_eq!(resp.address, "addr".to_string());
+        assert_eq!(resp.address, manager.address());
         assert_eq!(resp.store_address, "store_addr".to_string());
         assert_eq!(resp.max_step, 123);
         assert_eq!(resp.max_rank, Some(0));
@@ -525,7 +521,7 @@ mod tests {
                 let manager = Manager::new(
                     format!("rep_{}", replica_id),
                     lighthouse_addr,
-                    "addr".to_string(),
+                    "localhost".to_string(),
                     "[::]:0".to_string(),
                     "store_addr".to_string(),
                     1, // world size

torchft/manager.py

@@ -100,6 +100,7 @@ def __init__(
         lighthouse_addr: Optional[str] = None,
         replica_id: Optional[str] = None,
         port: Optional[int] = None,
+        hostname: str = socket.gethostname(),
     ) -> None:
         """
         Args:
@@ -122,6 +123,7 @@ def __init__(
             store_port: TCPStore port for this replica group
             lighthouse_addr: if rank==0, the address of the lighthouse server
             replica_id: if rank==0, the replica_id for this group
+            hostname: if rank==0, the hostname to advertise to the lighthouse server
         """
         self._load_state_dict = load_state_dict
         self._state_dict = state_dict
@@ -159,12 +161,9 @@ def _manager_state_dict() -> Dict[str, T]:
         self._manager: Optional[_Manager] = None
 
         if rank == 0:
-            hostname = socket.gethostname()
-
             if port is None:
                 port = int(os.environ.get(MANAGER_PORT_ENV, 0))
 
-            addr = f"http://{hostname}:{port}"
             bind = f"[::]:{port}"
             lighthouse_addr = lighthouse_addr or os.environ["TORCHFT_LIGHTHOUSE"]
 
@@ -174,7 +173,7 @@ def _manager_state_dict() -> Dict[str, T]:
             self._manager = _Manager(
                 replica_id=replica_id,
                 lighthouse_addr=lighthouse_addr,
-                address=addr,
+                hostname=hostname,
                 bind=bind,
                 store_addr=f"{store_addr}:{store_port}",
                 world_size=world_size,

torchft/torchft.pyi

@@ -27,7 +27,7 @@ class Manager:
         self,
         replica_id: str,
         lighthouse_addr: str,
-        address: str,
+        hostname: str,
         bind: str,
         store_addr: str,
         world_size: int,
@@ -36,6 +36,12 @@ class Manager:
     def shutdown(self) -> None: ...
 
 class Lighthouse:
-    def __init__(self, bind: str, min_replicas: int, join_timeout_ms: Optional[int] = None, quorum_tick_ms: Optional[int] = None) -> None: ...
+    def __init__(
+        self,
+        bind: str,
+        min_replicas: int,
+        join_timeout_ms: Optional[int] = None,
+        quorum_tick_ms: Optional[int] = None,
+    ) -> None: ...
     def address(self) -> str: ...
     def shutdown(self) -> None: ...