Source file `registration.ml`

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(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2020 Nomadic Labs, <contact@nomadic-labs.com>               *)
(*                                                                           *)
(* Permission is hereby granted, free of charge, to any person obtaining a   *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense,  *)
(* and/or sell copies of the Software, and to permit persons to whom the     *)
(* Software is furnished to do so, subject to the following conditions:      *)
(*                                                                           *)
(* The above copyright notice and this permission notice shall be included   *)
(* in all copies or substantial portions of the Software.                    *)
(*                                                                           *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL   *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING   *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER       *)
(* DEALINGS IN THE SOFTWARE.                                                 *)
(*                                                                           *)
(*****************************************************************************)

open Tezos_shell_services

module type Proxy_sig = sig
  val protocol_hash : Protocol_hash.t

  (** RPCs provided by the protocol *)
  val directory : Tezos_protocol_environment.rpc_context Tezos_rpc.Directory.t

  (** How to build the context to execute RPCs on *)
  val initial_context :
    Proxy_getter.rpc_context_args ->
    Context_hash.t ->
    Tezos_protocol_environment.Context.t tzresult Lwt.t

  val time_between_blocks :
    Tezos_rpc.Context.generic ->
    Block_services.chain ->
    Block_services.block ->
    int64 option tzresult Lwt.t

  include Light_proto.PROTO_RPCS
end

type proxy_environment = (module Proxy_sig)

let registered : proxy_environment list ref = ref []

let register_proxy_context m =
  let (module INCOMING_P : Proxy_sig) = m in
  if
    List.exists
      (fun (module P : Proxy_sig) ->
        Protocol_hash.(P.protocol_hash = INCOMING_P.protocol_hash))
      !registered
  then
    raise
    @@ Invalid_argument
         (Format.asprintf
            "A proxy environment for protocol %a is registered already"
            Protocol_hash.pp
            INCOMING_P.protocol_hash)
  else registered := m :: !registered

let get_all_registered () : proxy_environment list = !registered

let get_registered_proxy (printer : Tezos_client_base.Client_context.printer)
    (protocol_hash : Protocol_hash.t) : proxy_environment tzresult Lwt.t =
  let open Lwt_result_syntax in
  let available = !registered in
  let proxy_opt =
    List.find_opt
      (fun (module Proxy : Proxy_sig) ->
        Protocol_hash.equal protocol_hash Proxy.protocol_hash)
      available
  in
  match proxy_opt with
  | Some proxy -> return proxy
  | None -> (
      match available with
      | [] ->
          failwith
            "There are no proxy environments registered. --mode proxy cannot \
             be honored."
      | fst_available :: _ ->
          let (module Proxy : Proxy_sig) = fst_available in
          let fst_available_proto = Proxy.protocol_hash in
          let*! () =
            printer#warning
              "requested protocol (%a) not found in available proxy \
               environments: %a@;\
               Proceeding with the first available protocol (%a). This will \
               work if the mismatch is harmless, otherwise deserialization is \
               the failure most likely to happen."
              Protocol_hash.pp
              protocol_hash
              (Format.pp_print_list
                 ~pp_sep:Format.pp_print_space
                 Protocol_hash.pp)
              ((List.map (fun (module P : Proxy_sig) -> P.protocol_hash))
                 available)
              Protocol_hash.pp
              fst_available_proto
          in
          return fst_available)