P2p: change configuration of P2p_maintenance

It feels more coherent not to configure `P2p_pool` with parameters
only for `P2p_maintenance`.

src/lib_p2p/p2p.ml

@@ -72,7 +72,7 @@ type limits = {
   connection_timeout : float ;
   authentication_timeout : float ;
   greylist_timeout : int ;
-  maintenance_idle_time: float ;
+  maintenance_idle_time : float ;
 
   min_connections : int ;
   expected_connections : int ;
@@ -127,8 +127,6 @@ let create_connection_pool config limits meta_cfg conn_meta_cfg msg_cfg io_sched
     max_incoming_connections = limits.max_incoming_connections ;
     connection_timeout = limits.connection_timeout ;
     authentication_timeout = limits.authentication_timeout ;
-    greylist_timeout = limits.greylist_timeout ;
-    maintenance_idle_time = limits.maintenance_idle_time ;
     incoming_app_message_queue_size = limits.incoming_app_message_queue_size ;
     incoming_message_queue_size = limits.incoming_message_queue_size ;
     outgoing_message_queue_size = limits.outgoing_message_queue_size ;
@@ -173,11 +171,15 @@ let create_maintenance_worker limits pool config =
     bounds
       ~min:limits.min_connections
       ~expected:limits.expected_connections
-      ~max:limits.max_connections
-  in
-  let discovery =
-    may_create_discovery_worker limits config pool in
-  P2p_maintenance.create ?discovery bounds pool
+      ~max:limits.max_connections in
+  let maintenance_config = {
+    P2p_maintenance.
+    maintenance_idle_time = limits.maintenance_idle_time ;
+    greylist_timeout = limits.greylist_timeout ;
+    private_mode = config.private_mode ;
+  } in
+  let discovery = may_create_discovery_worker limits config pool in
+  P2p_maintenance.create ?discovery maintenance_config bounds pool
 
 let may_create_welcome_worker config limits pool =
   match config.listening_port with

src/lib_p2p/p2p_maintenance.ml

@@ -33,10 +33,17 @@ type bounds = {
   max_threshold: int ;
 }
 
+type config = {
+  maintenance_idle_time: float ;
+  greylist_timeout: int ;
+  private_mode: bool ;
+}
+
 type 'meta pool = Pool : ('msg, 'meta, 'meta_conn) P2p_pool.t -> 'meta pool
 
 type 'meta t = {
   canceler: Lwt_canceler.t ;
+  config: config ;
   bounds: bounds ;
   pool: 'meta pool ;
   discovery: P2p_discovery.t option ;
@@ -64,7 +71,6 @@ let connectable st start_time expected seen_points =
         | Some t1, Some t2 -> Time.compare t2 t1
     end) in
   let acc = Bounded_point_info.create expected in
-  let private_mode = (P2p_pool.config pool).P2p_pool.private_mode in
   let seen_points =
     P2p_pool.Points.fold_known pool ~init:seen_points
       ~f:begin fun point pi seen_points ->
@@ -75,7 +81,7 @@ let connectable st start_time expected seen_points =
         *)
         if P2p_point.Set.mem point seen_points ||
            P2p_pool.Points.banned pool point ||
-           (private_mode && not (P2p_point_state.Info.trusted pi))
+           (st.config.private_mode && not (P2p_point_state.Info.trusted pi))
         then
           seen_points
         else
@@ -131,9 +137,8 @@ let rec try_to_contact
 let rec maintain st =
   let Pool pool = st.pool in
   let n_connected = P2p_pool.active_connections pool in
-  let pool_cfg = P2p_pool.config pool in
   let older_than =
-    Time.(add (now ()) (Int64.of_int (- pool_cfg.greylist_timeout)))
+    Time.(add (now ()) (Int64.of_int (- st.config.greylist_timeout)))
   in
   P2p_pool.gc_greylist pool ~older_than ;
   if n_connected < st.bounds.min_threshold then
@@ -190,11 +195,10 @@ and too_many_connections st n_connected =
 
 let rec worker_loop st =
   let Pool pool = st.pool in
-  let config = P2p_pool.config pool in
   begin
     protect ~canceler:st.canceler begin fun () ->
       Lwt.pick [
-        Lwt_unix.sleep config.P2p_pool.maintenance_idle_time ; (* default: every two minutes *)
+        Lwt_unix.sleep st.config.maintenance_idle_time ; (* default: every two minutes *)
         Lwt_condition.wait st.please_maintain ; (* when asked *)
         P2p_pool.Pool_event.wait_too_few_connections pool ; (* limits *)
         P2p_pool.Pool_event.wait_too_many_connections pool ;
@@ -214,8 +218,9 @@ let rec worker_loop st =
   | Error [ Canceled ] -> Lwt.return_unit
   | Error _ -> Lwt.return_unit
 
-let create ?discovery bounds pool = {
+let create ?discovery config bounds pool = {
   canceler = Lwt_canceler.create () ;
+  config ;
   bounds ;
   discovery ;
   pool = Pool pool ;

src/lib_p2p/p2p_maintenance.mli

@@ -50,15 +50,32 @@ type bounds = {
   max_threshold: int ;
 }
 
+type config = {
+
+  maintenance_idle_time: float ;
+  (** How long to wait at most, in seconds, before running a maintenance loop. *)
+
+  greylist_timeout: int ;
+  (** GC delay for the greylists tables, in seconds. *)
+
+  private_mode: bool ;
+  (** If [true], only open outgoing/accept incoming connections
+      to/from peers whose addresses are in [trusted_peers], and inform
+      these peers that the identity of this node should be revealed to
+      the rest of the network. *)
+
+}
+
+
 type 'meta t
 (** Type of a maintenance worker. *)
 
 val create:
   ?discovery:P2p_discovery.t ->
-  bounds ->
+  config -> bounds ->
   ('msg, 'meta, 'meta_conn) P2p_pool.t ->
   'meta t
-(** [run ?discovery bounds pool] returns a maintenance worker, with
+(** [run ?discovery config bounds pool] returns a maintenance worker, with
     the [discovery] worker if present, for [pool] with connection targets
     specified in [bounds]. *)
 

src/lib_p2p/p2p_pool.ml

@@ -200,8 +200,6 @@ type config = {
   max_incoming_connections : int ;
   connection_timeout : float ;
   authentication_timeout : float ;
-  greylist_timeout : int ;
-  maintenance_idle_time: float ;
 
   incoming_app_message_queue_size : int option ;
   incoming_message_queue_size : int option ;

src/lib_p2p/p2p_pool.mli

@@ -103,12 +103,6 @@ type config = {
   authentication_timeout : float ;
   (** Delay granted to a peer to perform authentication, in seconds. *)
 
-  greylist_timeout : int ;
-  (** GC delay for the grelists tables, in seconds. *)
-
-  maintenance_idle_time: float ;
-  (** How long to wait at most, in seconds, before running a maintenance loop. *)
-
   incoming_app_message_queue_size : int option ;
   (** Size of the message queue for user messages (messages returned
       by this module's [read] function. *)

src/lib_p2p/test/test_p2p_pool.ml

@@ -94,8 +94,6 @@ let detach_node f points n =
       max_incoming_connections = nb_points ;
       connection_timeout = 10. ;
       authentication_timeout = 2. ;
-      greylist_timeout = 2 ;
-      maintenance_idle_time = 120. ;
       incoming_app_message_queue_size = None ;
       incoming_message_queue_size = None ;
       outgoing_message_queue_size = None ;