package mirage-flow-combinators

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String flows
Cstruct buffers flows

mirage-flow-combinators
- Mirage_flow_combinators
  - CONCRETE
  - Concrete
    
    S
  - Copy
    
    A
    
    B
    
    Clock
  - F
  - Proxy
    
    A
    
    B
    
    Clock

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In-memory, function-based flows.

include Mirage_flow.S

type error

The type for flow errors.

val pp_error : error Fmt.t

pp_error is the pretty-printer for errors.

type nonrec write_error = private [>

| Mirage_flow.write_error

]

The type for write errors.

val pp_write_error : write_error Fmt.t

pp_write_error is the pretty-printer for write errors.

type flow

The type for flows. A flow represents the state of a single reliable stream that is connected to an endpoint.

val read : flow -> (Cstruct.t Mirage_flow.or_eof, error) result Lwt.t

read 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.

If the remote endpoint calls close then calls to read will keep returning data until all the in-flight data has been read. read flow will return `Eof when the remote endpoint has called close and when there is no more in-flight data.

val write : flow -> Cstruct.t -> (unit, write_error) result Lwt.t

write flow buffer writes a buffer to the flow. There is no indication when the buffer has actually been read 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.

val writev : flow -> Cstruct.t list -> (unit, write_error) result Lwt.t

writev flow buffers writes a sequence of buffers to the flow. There is no indication when the buffers have actually been read 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.

val shutdown : flow -> [ `read | `write | `read_write ] -> unit Lwt.t

shutdown flow mode shuts down the flow for the specific mode: A flow which is shutdown `read (or `read_write will never be read again (future 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. In TCP, a FIN is sent.

val close : flow -> unit Lwt.t

close 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.

type refill = Cstruct.t -> int -> int -> int Lwt.t

The type for refill functions.

val make : 
  ?close:(unit -> unit Lwt.t) ->
  ?input:refill ->
  ?output:refill ->
  unit ->
  flow

make ~close ~input ~output () is a flow using input to refill its internal input buffer when needed and output to refill its external output buffer. It is using close to eventually clean-up other resources on close.

String flows

val input_string : string -> refill

input_string buf is the refill function reading its inputs from the string buf.

val output_bytes : bytes -> refill

output_bytes buf is the refill function writing its outputs in the buffer buf.

val string : ?input:string -> ?output:bytes -> unit -> flow

The flow built using input_string and output_bytes.

val input_strings : string list -> refill

input_strings bufs is the refill function reading its inputs from the list of buffers bufs. Empty strings are ignored.

val output_bytess : bytes list -> refill

output_bytess buf is the refill function writing its outputs in the list of buffers buf. Empty strings are ignored.

val strings : ?input:string list -> ?output:bytes list -> unit -> flow

The flow built using input_strings and output_bytess.

Cstruct buffers flows

val input_cstruct : Cstruct.t -> refill

Same as input_string but for Cstruct.t buffers.

val output_cstruct : Cstruct.t -> refill

Same as output_string buf for Cstruct.t buffers.

val cstruct : ?input:Cstruct.t -> ?output:Cstruct.t -> unit -> flow

Same as string but for Cstruct.t buffers.

val input_cstructs : Cstruct.t list -> refill

Same as input_strings but for Cstruct.t buffers.

val output_cstructs : Cstruct.t list -> refill

Same as output_strings but for Cstruct.t buffers.

val cstructs : ?input:Cstruct.t list -> ?output:Cstruct.t list -> unit -> flow

Same as strings but for Cstruct.t buffers.