package logs
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sha512=b75fb28e83f33461b06b5c9b60972c4a9a9a1599d637b4a0c7b1e86a87f34fe5361e817cb31f42ad7e7cbb822473b28fab9f58a02870eb189ebe88dae8e045ff
doc/logs.lwt/Logs_lwt/index.html
Module Logs_lwtSource
Lwt logging.
The log functions of this module return Lwt threads that proceed only when the log operation is over, as defined by the current Logs.reporter.
See a cooperative reporter example.
Log functions
The type for Lwt log functions. The returned thread only proceeds once the log operation is over. See Logs.log.
See Logs.msg.
See Logs.debug.
val kmsg :
(unit -> 'b Lwt.t) ->
?src:Logs.src ->
Logs.level ->
('a, 'b Lwt.t) Logs.msgf ->
'b Lwt.tSee Logs.kmsg.
Logging result value Errors
val on_error :
?src:Logs.src ->
?level:Logs.level ->
?header:string ->
?tags:Logs.Tag.set ->
pp:(Format.formatter -> 'b -> unit) ->
use:('b -> 'a Lwt.t) ->
('a, 'b) result Lwt.t ->
'a Lwt.tSee Logs.on_error.
val on_error_msg :
?src:Logs.src ->
?level:Logs.level ->
?header:string ->
?tags:Logs.Tag.set ->
use:(unit -> 'a Lwt.t) ->
('a, [ `Msg of string ]) result Lwt.t ->
'a Lwt.tSee Logs.on_error_msg.
Source specific log functions
src_log src is a set of logging functions for src.
Cooperative reporter example
The following reporter will play nice with Lwt's runtime, it will behave synchronously for the log functions of this module and asynchronously for those of the Logs module (see Note on synchronous logging).
It reuses Reporter and will produce colorful output if the standard formatters are setup to do so. For example it can be used instead of Reporter in the full setup example.
let lwt_reporter () =
let buf_fmt ~like =
let b = Buffer.create 512 in
Fmt.with_buffer ~like b,
fun () -> let m = Buffer.contents b in Buffer.reset b; m
in
let app, app_flush = buf_fmt ~like:Fmt.stdout in
let dst, dst_flush = buf_fmt ~like:Fmt.stderr in
let reporter = Logs_fmt.reporter ~app ~dst () in
let report src level ~over k msgf =
let k () =
let write () = match level with
| Logs.App -> Lwt_io.write Lwt_io.stdout (app_flush ())
| _ -> Lwt_io.write Lwt_io.stderr (dst_flush ())
in
let unblock () = over (); Lwt.return_unit in
Lwt.finalize write unblock |> Lwt.ignore_result;
k ()
in
reporter.Logs.report src level ~over:(fun () -> ()) k msgf;
in
{ Logs.report = report }