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Safer Lwt_process usage for calling builder-viz cmd (#71)

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Co-authored-by: Reynir Björnsson <reynir@reynir.dk>
Co-authored-by: rand00 <oth.rand@gmail.com>
Reviewed-on: https://git.robur.io/robur/builder-web/pulls/71
Co-authored-by: rand <rand@r7p5.earth>
Co-committed-by: rand <rand@r7p5.earth>
This commit is contained in:
rand 2022-02-02 14:50:44 +00:00 committed by Reynir Björnsson
parent 6a645b7358
commit f3aa2a2c90
1 changed files with 23 additions and 11 deletions
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34
lib/builder_web.ml
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@ -4,6 +4,8 @@ module Log = (val Logs.src_log src : Logs.LOG)
open Lwt.Syntax
open Lwt_result.Infix
let sprintf = Printf.sprintf
let pp_error ppf = function
| #Caqti_error.connect as e -> Caqti_error.pp ppf e
| #Model.error as e -> Model.pp_error ppf e
@ -184,15 +186,22 @@ let add_routes datadir =
in
let visualization_cmd args =
let cmd = "", Array.of_list ("builder-viz" :: args)
let cmd_list = "builder-viz" :: args in
let cmd = "", Array.of_list cmd_list in
let pin =
Lwt_process.open_process_in
~stdin:`Dev_null ~stderr:`Dev_null
~timeout:15.
cmd
in
Lwt_process.pread cmd
~stderr:`Dev_null
~timeout:15.
|> Lwt_result.catch
|> Lwt_result.map_err (fun exn ->
Printexc.to_string exn, `Internal_Server_Error
)
let* output = Lwt_io.read pin#stdout
and* exit_status = pin#status in
match exit_status with
| Unix.WEXITED 0 -> Lwt_result.return output
| Unix.WEXITED _ | Unix.WSIGNALED _ |Unix.WSTOPPED _ ->
let cmd_str = String.concat " " cmd_list in
`Msg (sprintf "Error when running cmd: '%s'" cmd_str)
|> Lwt_result.fail
in
let treemap_visualization_cmd ~debug_elf_path ~elf_size =
@ -226,8 +235,9 @@ let add_routes datadir =
datadir // debug_binary.Builder_db.localpath
|> to_string
) in
treemap_visualization_cmd ~debug_elf_path ~elf_size >>= fun svg_html ->
(* Lwt_result.ok (dream_svg svg) *)
treemap_visualization_cmd ~debug_elf_path ~elf_size
|> if_error "Failed to generate treemap visualization"
>>= fun svg_html ->
Lwt_result.ok (Dream.html svg_html)
in
@ -245,7 +255,9 @@ let add_routes datadir =
datadir // opam_switch.Builder_db.localpath
|> to_string
) in
dependencies_visualization_cmd ~opam_switch_path >>= fun svg_html ->
dependencies_visualization_cmd ~opam_switch_path
|> if_error "Failed to generate dependencies visualization"
>>= fun svg_html ->
Lwt_result.ok (Dream.html svg_html)
in