package protocol_version_header

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This library offers a lightweight way for applications protocols to version themselves. The more protocols that add themselves to Known_protocol, the nicer error messages we will get when connecting to a service while using the wrong protocol.

type t
val __bin_read_t__ : (int -> t) Core_kernel.Bin_prot.Read.reader
val t_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> t
val sexp_of_t : t -> Ppx_sexp_conv_lib.Sexp.t
val create : protocol:Protocol_version_header__.Known_protocol.t -> supported_versions:int list -> t
val negotiate : allow_legacy_peer:bool -> us:t -> peer:t -> int Core_kernel.Or_error.t

negotiate ~allow_legacy_peer ~us ~peer inspects the magic numbers of us and peer. If the magic numbers match, the highest shared version number is returned.

If allow_legacy_peer then the magic number of peer is assumed to be us if no magic number exists.

val contains_magic_prefix : protocol:Protocol_version_header__.Known_protocol.t -> bool Core_kernel.Bin_prot.Type_class.reader

contains_magic_prefix reads a bin_protted value of type t and returns a boolean saying whether this magic number was observed.

val any_magic_prefix : Protocol_version_header__.Known_protocol.t option Core_kernel.Bin_prot.Type_class.reader

any_magic_prefix reads the magic number for one of the known protocols.