p2p_maintenance.mli
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(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
(* Copyright (c) 2019 Nomadic Labs, <contact@nomadic-labs.com> *)
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(** P2P maintenance worker.
This worker enforces the connection bounds defined on the command-line
or/and the configuration file.
The maintenance process is launched:
. When any of the following future is resolved
[P2p_trigger.wait_too_few_connections]
[P2p_trigger.wait_too_many_connections]
. When [maintain] is called
. After [maintenance_idle_time] if none of the other conditions have been
met.
If the number of connections is above the limit, the maintainer
kills existing connections.
If below the limit, it tries to connect to points available from [P2p_pool].
If not enough connections can be obtained, it requests new points from
[P2p_pool] using [P2p_pool.broadcast msg], and wakes up the
[P2p_discovery] worker. It then waits for new peers or points by waiting
on futures
[P2p_trigger.wait_new_peer]
[P2p_trigger.wait_new_point]
This is reiterated indefinitely every [require_new_points_time]. *)
type config = {
maintenance_idle_time : Time.System.Span.t;
(** How long to wait at most before running a maintenance loop. *)
greylist_timeout : Time.System.Span.t;
(** GC delay for the greylists tables. *)
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. *)
min_connections : int; (** Strict minimum number of connections *)
max_connections : int; (** Maximum number of connections *)
expected_connections : int; (** Targeted number of connections to reach *)
}
(** Type of a maintenance worker. *)
type ('msg, 'meta, 'meta_conn) t
(** [create ?discovery config pool triggers log] returns a maintenance worker,
with the [discovery] worker if present, for [pool]. *)
val create :
?discovery:P2p_discovery.t ->
config ->
('msg, 'meta, 'meta_conn) P2p_pool.t ->
('msg, 'meta, 'meta_conn) P2p_connect_handler.t ->
P2p_trigger.t ->
log:(P2p_connection.P2p_event.t -> unit) ->
('msg, 'meta, 'meta_conn) t
(** [activate t] starts the worker that will maintain connections *)
val activate : ('msg, 'meta, 'meta_conn) t -> unit
(** [maintain t] gives a hint to maintenance worker [t] that
maintenance is needed and returns whenever [t] has done a
maintenance cycle. *)
val maintain : ('msg, 'meta, 'meta_conn) t -> unit Lwt.t
(** [shutdown t] is a thread that returns whenever [t] has
successfully shut down. *)
val shutdown : ('msg, 'meta, 'meta_conn) t -> unit Lwt.t