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package mimic
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module Mirage_protocol : sig ... endThe type for flows. A flow represents the state of a single reliable stream stream that is connected to an endpoint.
include Mirage_flow.S
with type flow := flow
and type error = [ `Msg of string | `Not_found | `Cycle ]
The type for write errors.
val pp_write_error : write_error Fmt.tpp_write_error is the pretty-printer for write errors.
val read : flow -> (Cstruct.t Mirage_flow.or_eof, error) Stdlib.result Lwt.tread flow blocks until some data is available and returns a fresh buffer containing it.
The returned buffer will be of a size convenient to the flow implementation, but will always have at least 1 byte.
When read returns `Eof or an error, close (or shutdown) should be called on the flow by the client. Once read returned `Eof or an error, no subsequent read call will be successful.
val write : flow -> Cstruct.t -> (unit, write_error) Stdlib.result Lwt.twrite flow buffer writes a buffer to the flow. There is no indication when the buffer has actually been sent and, therefore, it must not be reused. The contents may be transmitted in separate packets, depending on the underlying transport. The result Ok () indicates success, Error `Closed indicates that the connection is now closed and therefore the data could not be written. Other errors are possible.
The promise is resolved when the buffer has been accepted by the implementation (if a partial write occured, write will wait until the remainder of the buffer has been accepted by the implementation).
If write returns an error, close (or shutdown) should be called on the flow by the client. Once write returned an error, no subsequent write or writev call will be successful.
val writev : flow -> Cstruct.t list -> (unit, write_error) Stdlib.result Lwt.twritev flow buffers writes a sequence of buffers to the flow. There is no indication when the buffers have actually been sent and, therefore, they must not be reused. The result Ok () indicates success, Error `Closed indicates that the connection is now closed and therefore the data could not be written. Other errors are possible.
The promise is resolved when the buffers have been accepted by the implementation (if a partial write occured, writev will wait until all buffers have been accepted by the implementation).
If writev returns an error, close (or shutdown) should be called on the flow by the client. Once writev returned an error, no subsequent writev or write call will be successful.
val shutdown : flow -> [ `read | `write | `read_write ] -> unit Lwt.tshutdown flow mode shuts down the flow for the specific mode: A flow which is shutdown `read (or `read_write) will never be read again (subsequent calls will return `Eof); a flow which is shutdown `write (or `read_write) flushes all pending writes and signals the remote endpoint there won't be any future write or writev calls (subsequent calls will return `Closed). E.g. in TCP, the signalling is done by sending a segment with the FIN flag.
If this flow is layered upon another flow' (e.g. TLS over TCP), and the internal state after shutdown is `Closed, close on the underlying flow' is executed.
val close : flow -> unit Lwt.tclose flow terminates the flow and frees all associated data. Any subsequent read or write will return an error. A subsequent close will not do anything (esp. not raising an exception), but it may log an error.
If this flow is layered upon another flow' (e.g. TLS over TCP), close on the underlying flow' is executed.
module Fun : sig ... endval make : name:string -> 'edn valuemake ~name is a new witness.
replace w v ctx replaces the value of w by v if it exists or bound w to v.
val empty : ctxempty is the empty context.
val register :
?priority:int ->
name:string ->
(module Mirage_protocol.S with type endpoint = 'edn and type flow = 'flow) ->
'edn value * ('edn, 'flow) protocolregister ?priority ~name (module Protocol) registers the given Protocol into the internal global Mimic's state as a possible transmission protocol available via resolve.
?priority is used to help mimic to choose between multiple solutions according to the given context. Mimic will choose the lower-priority solution.
name helps the end-user to know which solution mimic will dynamically via log outputs.
register returns 2 values:
module type REPR = sig ... endrepr protocol gives a module definition with an OCaml constructor to help the end-user to destruct the structural type of a given flow:
module Protocol
: Mirage_protocol.S with type flow = Lwt_unix.file_descr
let edn, protocol = Mimic.register ~name:"protocol" (module Protocol)
module R = (val (Mimic.repr protocol))
let () = Mimic.resolve ~ctx >>= function
| Ok (R.T lwt_unix_file_descr) -> ...
| ...resolve ctx tries to instantiate a flow from the given ctx.
equal a b returns a proof that a and b are structurally equal.
unfold ctx applies any functions available into the given ctx and and possible to compute according to available values and return a list of what these functions return.
It's useful to do an introspection of what mimic does when it resolves the given ctx. From that and equal, the user is able to introspect what mimic generated and which protocol it is able to instantiate then.
al:resolve} is:
{[
let resolve ctx =
unfold ctx >>= function
| Ok lst -> connect lst
| Error _ as err -> Lwt.return err
]}