package devkit
Development kit - general purpose library
Install
Dune Dependency
Authors
Maintainers
Sources
devkit-1.20240429.tbz
sha256=222f8ac131b1d970dab7eeb2714bfd6b9338b88b1082e6e01c136ae19e7eaef4
sha512=c9e6d93e3d21e5530c0f4d5baca51bf1f0a5d19248f8af7678d0665bb5cdf295d7aaaaa3e50eb2e44b8720e55097cc675af4dc8ec45acf9da39feb3eae1405d5
doc/src/devkit.core/logstash.ml.html
Source file logstash.ml
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open Printf open ExtLib open Prelude let log = Log.from "logstash" let state = Hashtbl.create 100 let dynamic = Hashtbl.create 100 let escape k = if String.contains k ' ' then String.map (function ' ' -> '_' | c -> c) k else k let zero = Var.(function Count _ -> Count 0 | Time _ -> Time 0. | Bytes _ -> Bytes 0) module J = Yojson.Safe type json = [ `Float of float | `Int of int | `String of string ] module Dyn = struct open Var type t = (string * json) list let show_a = Stre.list (fun (c,_) -> sprintf "%S:''" c) let make_family family = let f = List.unique ~cmp:(fun (a,_) (b,_) -> a = b) family in if List.length f <> List.length family then log #warn "duplicate attributes : %s" (show_a family); List.sort ~cmp:(fun (a,_) (b,_) -> String.compare a b) family let make ?(attrs=[]) name = match is_in_families name with | true -> Exn.fail "static class with this name already exists: %s" name | false -> make_family (("class", `String name)::attrs) let extend dyn attrs = match attrs with | [] -> dyn | attrs -> make_family dyn @ attrs let set dyn ?(attrs=[]) v = let family = extend dyn attrs in Hashtbl.replace dynamic family v let add dyn ?(attrs =[]) v = let family = extend dyn attrs in match Hashtbl.find_default dynamic family (zero v),v with | Count x, Count x' -> let n = x + x' in Hashtbl.replace dynamic family (Count n) | Bytes x, Bytes x' -> let n = x + x' in Hashtbl.replace dynamic family (Bytes n) | Time x, Time x' -> let n = x +. x' in Hashtbl.replace dynamic family (Time n) | Count _, Bytes _ | Count _, Time _ | Bytes _, Count _ | Bytes _, Time _ | Time _, Count _ | Time _, Bytes _ -> log #warn "mismatched value type for %s" (show_a family) let set_count dyn attrs v = set dyn ~attrs (Count v) let set_bytes dyn attrs v = set dyn ~attrs (Bytes v) let set_time dyn attrs v = set dyn ~attrs (Time v) let add_count dyn attrs v = add dyn ~attrs (Count v) let add_bytes dyn attrs v = add dyn ~attrs (Bytes v) let add_time dyn attrs v = add dyn ~attrs (Time v) end let timestamp_field () = ("timestamp_ms", `Int Time.(to_ms @@ now ())) let common_fields () = [ timestamp_field (); "pid", `String (Pid.show_self ()); "from", `String (Pid.self ()).Pid.name; ] let get () = let open Var in let l = ref [] in Var.iter begin fun attr' v -> let (previous,attr) = try Hashtbl.find state attr' with | Not_found -> let a = List.map (fun (k, s) -> escape k, `String s) attr' in let x = ref (zero v), a in Hashtbl.add state attr' x; x in let this = (common_fields () @ attr : (string * json) list :> (string * [> json ]) list) in match v, !previous with | Count x, Count x' -> let delta = x - x' in if delta <> 0 then begin previous := v; tuck l @@ `Assoc (("count", `Int delta) :: this) end | Bytes x, Bytes x' -> let delta = x - x' in if delta <> 0 then begin previous := v; tuck l @@ `Assoc (("bytes", `Int delta) :: this) end | Time x, Time x' -> let delta = x -. x' in if delta > epsilon_float then begin previous := v; tuck l @@ `Assoc (("seconds", `Float delta) :: this) end | Count _, Bytes _ | Count _, Time _ | Bytes _, Count _ | Bytes _, Time _ | Time _, Count _ | Time _, Bytes _ -> log #warn "the impossible happened : mismatched type for %S" (show_a attr') end; dynamic |> Hashtbl.iter begin fun attr v -> let attr = List.map (fun (k, s) -> escape k, s) attr in let this = (common_fields () @ attr : (string * json) list :> (string * [> json ]) list) in let add c = tuck l @@ `Assoc (c :: this) in match v with | Count x -> add ("count", `Int x) | Bytes x -> add ("bytes", `Int x) | Time x -> add ("seconds", `Float x) end; Hashtbl.clear dynamic; !l let get_basename () = match !Daemon.logfile with | None -> log #warn "no logfile, disabling logstash stats too"; None | Some logfile -> let f = try Filename.chop_extension logfile with _ -> logfile in log #info "will output logstash stats to %s.YYYYMMDD.json" f; Some f let open_logstash_exn basename = let filename = sprintf "%s.%s.json" basename (Time.format_date8 @@ Unix.gmtime @@ Time.now ()) in try Files.open_out_append_text filename with exn -> Exn.fail ~exn "failed to open stats file %s" filename let write_json activity out nr json = let bytes = J.to_string ~std:true json ^ "\n" in try (* try not to step on the other forks toes, page writes are atomic *) if (String.length bytes > 4096 - !nr) then (activity := true; flush out; nr := 0); output_string out bytes; nr := !nr + String.length bytes with exn -> log #warn ~exn "failed to write event %S" bytes let line_writer out = let nr = ref 0 in write_json (ref false) out nr let setup_ setup = match get_basename () with | None -> () | Some stat_basename -> setup begin fun () -> match open_logstash_exn stat_basename with | exception exn -> log #warn ~exn "disabling output" | ch -> Control.bracket ch close_out_noerr begin fun ch -> let write = line_writer ch in get () |> List.iter write; flush ch end end let default_period = Time.seconds 60 let setup ?(pause=default_period) events = setup_ (fun f -> at_exit f; Async.setup_periodic_timer_wait events pause f) let setup_lwt ?(pause=default_period) () = setup_ (fun f -> at_exit f; let rec loop () = match Daemon.should_exit () with | true -> Lwt.return_unit | false -> Lwt.bind (Lwt_unix.sleep pause) (fun () -> f (); loop ()) in Lwt.async loop ) let round_to_midnight timestamp = let ms = Time.to_ms timestamp in let diff = ms mod (Time.days 1 |> Time.to_ms) in timestamp -. (Time.msec diff) let is_same_day timestamp = Time.now () -. Time.days 1 < timestamp type logger = < event : (string * Yojson.Safe.t) list -> unit; write : unit -> unit; reload : unit -> unit; flush : unit -> unit; > let null = object method event _j = () method write () = () method reload () = () method flush () = () end let log ?autoflush ?(verbose=false) ?(add_timestamp_only=false) ?name () = let add_fields = if add_timestamp_only then fun l -> timestamp_field () :: l else fun l -> common_fields () @ l in let name = match name with None -> get_basename () | Some _ -> name in match name with | None -> null | Some stat_basename -> match open_logstash_exn stat_basename with | exception exn -> log #warn ~exn "disabling output of %s" stat_basename; null | out -> let out = ref out in let nr = ref 0 in let activity = ref false in begin match autoflush with | None -> () | Some delay -> let rec l () = match Daemon.should_exit () with | true -> Lwt.return_unit | false -> activity := false; let%lwt () = Lwt_unix.sleep delay in if !nr > 0 && not !activity then (flush !out; nr := 0); l () in Lwt.async l end; object(self) val mutable timestamp = round_to_midnight @@ Time.now () method reload () = try if verbose then log #info "rotate log %s" stat_basename; let new_out = open_logstash_exn stat_basename in let prev = !out in out := new_out; nr := 0; timestamp <- round_to_midnight @@ Time.now (); flush prev; close_out_noerr prev with exn -> log #warn ~exn "failed to rotate log %s" stat_basename method private try_rotate () = match timestamp with | t when not @@ is_same_day t -> self#reload () | _ -> () method write () = self#try_rotate (); get () |> List.iter (write_json activity !out nr) method event j = self#try_rotate (); write_json activity !out nr (`Assoc (add_fields j)) method flush () = if !nr > 0 && not !activity then (flush !out; nr := 0) end let logstash_err = Lazy.from_fun @@ log ~name:"log/errors" let setup_error_log () = Signal.set_reload !!logstash_err#reload; let chain_hook = !Log.State.hook in Log.State.hook := begin fun level facil s -> if level = `Error then begin !!logstash_err #event ["facility", `String facil.Logger.name; "message", `String s]; !!logstash_err #flush (); end; chain_hook level facil s end let lifetime ?(extra="") ~events ~version () = let start = Time.now () in let text = sprintf "%s start version %s" (Pid.self_name ()) version in events#event [ "event", `String "start"; "text", `String text; "extra", `String extra; "cmdline", `String Nix.cmdline; "cwd", `String (Sys.getcwd ()); "user", `String (try Unix.(getpwuid @@ geteuid ()).pw_name with _ -> ""); "version", `String version; ]; events#flush (); Signal.set_exit begin fun () -> events#event [ "event", `String "signal.stop"; "text", `String (sprintf "%s received stop signal" (Pid.self_name ())); "version", `String version; "start", `Int (Time.to_ms start); "uptime", `String (Time.ago_str start); ]; events#flush (); end; let pid = Unix.getpid () in at_exit begin fun () -> match pid = Unix.getpid () with | false -> () (* forked child *) | true -> events#event [ "event", `String "exit"; "text", `String (sprintf "%s exit" (Pid.self_name ())); "version", `String version; "start", `Int (Time.to_ms start); "uptime", `String (Time.ago_str start); ]; events#flush (); end
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