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(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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(** All the (persistent) metadata associated to a peer. *)

type t

val encoding: t Data_encoding.t
val empty : unit -> t



(** the aggregate score function computed from
    the metadata collected for a peer *)
val distributed_db_score : t -> float
val prevalidation_score : t -> float
val score : t -> float

type requests_kind =
  | Branch | Head | Block_header
  | Operations | Protocols
  | Operation_hashes_for_block | Operations_for_block
  | Other

type resource_kind =
  | Block | Operations | Protocol

type advertisement = Head | Branch

type metadata =
  (* Distributed_db *)
  | Received_request of requests_kind
  | Sent_request of requests_kind
  | Failed_request of requests_kind
  | Scheduled_request of requests_kind
  | Received_response of requests_kind
  | Sent_response of requests_kind
  | Unexpected_response
  | Unactivated_chain
  | Inactive_chain
  | Future_block
  | Unadvertised of resource_kind
  | Sent_advertisement of advertisement
  | Received_advertisement of advertisement
  | Outdated_response (* TODO : unused *)
  (* Peer validator *)
  | Valid_blocks | Old_heads
  (* Prevalidation *)
  | Cannot_download | Cannot_parse
  | Refused_by_prefilter
  | Refused_by_postfilter
  | Applied | Branch_delayed
  | Branch_refused
  | Refused | Duplicate | Outdated

(** incr score counters . Used to compute the final score for a peer *)
val incr : t ->   metadata -> unit
val update_requests : t -> requests_kind -> bool -> unit
val update_responses : t -> requests_kind -> bool -> unit