Revision 5fa6faa707c4eedc955a4f0562195703224a63fa authored by Thomas Letan on 14 August 2023, 09:49:56 UTC, committed by Thomas Letan on 14 August 2023, 09:55:15 UTC
Tztop was added at a time where the protocol couldn’t be loaded in utop. This is no longer the case, and as a consequence, we can safely retire tztop.
1 parent 5745a2e
errors.mli
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(** Extention of the open type [error] with the errors that could be raised by
the DAL node. *)
type error += Decoding_failed of Types.kind | Profile_incompatibility
(** The errors below are used to extend tzresult/tztrace monad/errors with Some
specific errors on which we'd like to match in the DAL node's code. *)
(** We would like to match decoding errors as they are sometimes expected
(e.g. when decoding data from the network) and we want to enable callers to
catch and handle them. On the other hand, encoding errors only happen in
unexpected circumstances (e.g. out of memory) so we don't expect callers to
catch and handle them. *)
type decoding = [`Decoding_failed of Types.kind * tztrace]
(** We would like to match [`Not_found] as we would want to return 404 HTTP code
to clients. *)
type not_found = [`Not_found]
(** We will use [`Other] to wrap other {!tztrace} errors in the new
polymorphic-variants based monad. *)
type other = [`Other of tztrace]
(** [other l] wraps the give tztrace [l] in [`Other]. *)
val other : tztrace -> [> other]
(** [other_result r] casts the given value [r] from the ['a tzresult] monad into
[('a, [> other_error]) result]. *)
val other_result : 'a tzresult -> ('a, [> other]) result
(** [other_lwt_result r] casts the given value [r] from the ['a tzresult Lwt.t]
monad into [('a, [> other]) result Lwt.t]. *)
val other_lwt_result : 'a tzresult Lwt.t -> ('a, [> other]) result Lwt.t
(** [to_option_tzresult v] transforms the given value [v] to another value in
the regular ['a option tzresult Lwt.t] monad.
Asuming the Lwt monad [v] successfully resolves, then:
- If it yields a value [Ok w], the function returns an Lwt monad whose
payload is [Ok (Some w)].
- If it yields a value [Error `Not_found], the function returns an Lwt monad
whose payload is [Ok (None)] so that {!Tezos_rpc_http} returns 404 HTTP code.
- If it yields a value [Error `Decoding_failed], the function returns an Lwt
monad whose payload is the tzresult of [Decoding_failed] concatenated to the
tztrance carried by [`Decoding_failed].
- Otherwise, it yields a value [Error `Other u]. In this case, the function
returns an Lwt monad whose payload is [Error u].
Note that an {!Event.decoding_data_failed} is emitted. in case a
[`Decoding_failed] is encountered. *)
val to_option_tzresult :
?none:(([< decoding | not_found | other] as 'b) -> bool) ->
('a, 'b) result Lwt.t ->
'a option tzresult Lwt.t
(** [to_tzresult v] is quite similar to {!to_option_tzresult}. Except that the
[`Not_found] case cannot happen, in which case the use of [option] for the
non-failing case is not needed. *)
val to_tzresult : ('a, [< decoding | other]) result Lwt.t -> 'a tzresult Lwt.t
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