package mehari-lwt-unix

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1. Environment Variables
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mehari-lwt-unix
- Library mehari-lwt-unix
  - Mehari_lwt_unix
    
    IO
- Sources
  - mehari-lwt-unix
    
    file.ml
    
    mehari_io.ml
    
    mehari_lwt_unix.ml
    
    mehari_lwt_unix__.ml

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Module `Mehari_lwt_unix`Source

An IO module Mehari implementation for Unix and Windows using Lwt. Contains also extra features based on Unix filesystem such as CGI.

Net

include Mehari_mirage.S with type addr = Ipaddr.t

Sourcemodule IO = Lwt

Sourcetype stack

TCP/IP stack.

Net

include Mehari.NET
  with module IO := IO
   and type addr = Ipaddr.t
  with type addr = Ipaddr.t

Sourcetype addr = Ipaddr.t

Type for IP address.

Sourcetype route

Routes tell router which handler to select for each request. See Routing.

Sourcetype rate_limiter

Rate limiter. See Rate limit.

Source

type middleware =
  (addr Mehari.request -> Mehari.response IO.t) ->
  addr Mehari.request ->
  Mehari.response IO.t

Middlewares take a handler, and run some code before or after — producing a “bigger” handler. See Middleware.

Middleware

Sourceval no_middleware : middleware

Does nothing but call its inner handler. Useful for disabling middleware conditionally during application startup:

if development then
  my_middleware
else
  Mehari.no_middleware

Sourceval pipeline : middleware list -> middleware

Combines a list of middlewares into one, such that these two lines are equivalent: Mehari.pipeline [ mw1 ; mw2 ] @@ handler mw1 @@ mw2 @@ handler.

Routing

Sourceval router : route list -> addr Mehari.request -> Mehari.response IO.t

Creates a router. If none of the routes match the Mehari.request, the router returns Mehari.not_found.

Source

val route : 
  ?rate_limit:rate_limiter ->
  ?mw:middleware ->
  ?regex:bool ->
  string ->
  (addr Mehari.request -> Mehari.response IO.t) ->
  route

route ~rate_limit ~mw ~regex path handler forwards requests for path to handler. path can be a string literal or a regex in Perl style depending of value of regex. If rate limit is in effect, handler is not executed and a respond with Mehari.status Mehari.slow_down is sended.

Source

val scope : 
  ?rate_limit:rate_limiter ->
  ?mw:middleware ->
  string ->
  route list ->
  route

scope ~rate_limit ~mw prefix routes groups routes under the path prefix, rate_limit and mw.

Sourceval no_route : route

A dummy value of type route that is completely ignored by the router. Useful for disabling routes conditionally during application start.

Rate limit

Source

val make_rate_limit : 
  ?period:int ->
  int ->
  [ `Second | `Minute | `Hour | `Day ] ->
  rate_limiter

make_rate_limit ~period n unit creates a rate_limiter which limits client to n request per period * unit. For example,

make_rate_limit ~period:2 5 `Hour

limits client to 5 requests every 2 hours.

Virtual hosting

Source

val virtual_hosts : 
  ?meth:[ `ByURL | `SNI ] ->
  (string * (addr Mehari.request -> Mehari.response IO.t)) list ->
  addr Mehari.request ->
  Mehari.response IO.t

virtual_hosts ?meth [(domain, handler); ...] produces a handler which enables virtual hosting at the TLS-layer using SNI.

meth can be used to choose which source to match the hostnames against. Defaults to `SNI.

Logging

Sourceval set_log_lvl : Logs.level -> unit

Set Mehari's logger to the given log level.

Source

val logger : 
  (addr Mehari.request -> Mehari.response IO.t) ->
  addr Mehari.request ->
  Mehari.response IO.t

Logs and times requests. Time spent logging is included.

Sourceval debug : 'a Logs.log

Sourceval info : 'a Logs.log

Sourceval warning : 'a Logs.log

Sourceval error : 'a Logs.log

Response

Sourceval respond : 'a Mehari.status -> 'a -> Mehari.response IO.t

Same as Mehari.response, but the new Mehari.response is wrapped in a promise.

Sourceval respond_body : Mehari.body -> Mehari.mime -> Mehari.response IO.t

Same as respond but respond with given Mehari.body and use given Mehari.mime as mime type.

Sourceval respond_text : string -> Mehari.response IO.t

Same as respond but respond with given text and use text/plain as Mehari.mime type.

Source

val respond_gemtext : 
  ?charset:string ->
  ?lang:string list ->
  Mehari.Gemtext.t ->
  Mehari.response IO.t

Same as respond but respond with given Mehari.Gemtext.t and use text/gemini as Mehari.mime type.

Source

val respond_raw : 
  [ `Body of string | `Full of int * string * string ] ->
  Mehari.response IO.t

Same as Mehari.response_raw, but the new Mehari.response is wrapped in a promise.

Entry point

include Mehari.FS
  with module IO := IO
   and type addr := addr
   and type dir_path := string

Sourcetype handler = addr Mehari.request -> Mehari.response IO.t

Sourceval response_document : ?mime:Mehari.mime -> string -> Mehari.response IO.t

Source

val static : 
  ?handler:(string -> handler) ->
  ?dir_listing:
    (([ `Directory | `Other | `Regular_file ] * string) list -> handler) ->
  ?index:string ->
  ?show_hidden:bool ->
  string ->
  handler

CGI

Mehari supports CGI scripting as described in RFC 3875

The CGI script must write the gemini response to the stdout stream. Status code and meta string on the first line, and the optional response body on subsequent lines. The bytes generated by the CGI script will be forwarded verbatim to the Gemini client, without any additional modification by the server.

Environment Variables

Some variables are empty for compatibility with other CGI script.

Let's say that the url requested is gemini://localhost/cgi/foo.cgi?input:

AUTH_TYPE: CERTIFICATE if a client certificate is provided, empty otherwise.
CONTENT_LENGTH: Empty.
CONTENT_TYPE: Empty.
GATEWAY_INTERFACE: CGI/1.1.
PATH_INFO: Example value: /cgi/foo.cgi.
PATH_TRANSLATED: Example value: /cgi/foo.cgi.
QUERY_STRING: Example value: input.
REMOTE_ADDR: Example value: 127.0.0.1.
REMOTE_HOST: Same as REMOTE_ADDR.
REMOTE_IDENT: Empty.
REMOTE_METHOD: Empty.
REMOTE_USER: Client certificate common if it is provided, empty otherwise.
SCRIPT_NAME: Example value: /var/cgi/foo.cgi.
SERVER_NAME: Example value: /var/cgi/foo.cgi.
SERVER_PORT: Example value: 1965.
SERVER_PROTOCOL: GEMINI.
SERVER_SOFTWARE: Example value: Mehari/1.0.

see https://www.rfc-editor.org/rfc/rfc3875
For the CGI specification.

Source

val run_cgi : 
  ?timeout:float ->
  ?nph:bool ->
  string ->
  addr Mehari.request ->
  Mehari.response Lwt.t

run_cgi ?timeout ?nph script_path req executes the given file as a CGI script and return a Mehari.response based on bytes printed on stdout by script. Responds with Mehari.cgi_error in case of error or timeout exceeding.

timeout defaults to 5.0.
nph decides if NPH (Non-Parsed Header) is enable. Defaults to false.

Entry point

Source

val run_lwt : 
  ?port:int ->
  ?verify_url_host:bool ->
  ?config:Tls.Config.server ->
  ?timeout:float ->
  certchains:Tls.Config.certchain list ->
  ?v4:Ipaddr.V4.Prefix.t ->
  ?v6:Ipaddr.V6.Prefix.t ->
  handler ->
  unit Lwt.t

See Mehari_mirage.S.run.

Source

val run : 
  ?port:int ->
  ?verify_url_host:bool ->
  ?config:Tls.Config.server ->
  ?timeout:float ->
  certchains:Tls.Config.certchain list ->
  ?v4:Ipaddr.V4.Prefix.t ->
  ?v6:Ipaddr.V6.Prefix.t ->
  handler ->
  unit

Like run_lwt but calls Lwt_main.run internally.

package mehari-lwt-unix

Module Mehari_lwt_unixSource

Net

Net

Middleware

Routing

Rate limit

Virtual hosting

Logging

Response

Entry point

CGI

Environment Variables

Entry point

Module `Mehari_lwt_unix`Source