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;;; Monitoring --- Server monitoring
;;; Copyright © 2021 Masaya Tojo <masaya@tojo.tokyo>
;;;
;;; This file is part of Monitoring.
;;;
;;; Monitoring is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Monitoring is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Monitoring. If not, see <http://www.gnu.org/licenses/>.
(define-module (tojo-tokyo monitoring)
#:use-module (ice-9 popen)
#:use-module (ice-9 textual-ports)
#:use-module (ice-9 regex)
#:use-module ((srfi srfi-1) #:select (any))
#:use-module ((srfi srfi-26))
#:use-module (web client))
(define-public current-heartbeat-url
(make-parameter
(let ((heartbeat-file "/etc/heartbeat-url"))
(or (and (file-exists? heartbeat-file)
(call-with-input-file heartbeat-file get-line))
"https://heartbeat.test"))))
(define (split-with-spaces x)
(map match:substring (list-matches "[^ ]+" x)))
(define (command->table command header)
(let ((port (open-input-pipe command)))
(get-line port) ; skip a header line.
(let loop ((line (get-line port))
(table '()))
(cond ((eof-object? line)
(close-pipe port)
table)
(else
(loop (get-line port)
(cons (map cons header (split-with-spaces line))
table)))))))
(define (df)
(command->table "df" '(filesystem 1k-blocks used available use% mounted-on)))
(define (prefix-/dev/? x)
(and (string? x)
(<= 5 (string-length x))
(string=? (substring x 0 5) "/dev/")))
(define (use%->number x)
(string->number (string-delete #\% x)))
(define-public (disk-use%-over? threshold)
(any (cut < threshold <>)
(map (compose use%->number (cut assoc-ref <> 'use%))
(filter (compose prefix-/dev/? (cut assoc-ref <> 'filesystem))
(df)))))
(define (df-i)
(command->table "df -i" '(filesystem inodes iused ifree iuse% mounted-on)))
(define (iuse%->number x)
(or (string->number (string-delete #\% x))
0))
(define-public (disk-iuse%-over? threshold)
(any (cut < threshold <>)
(map (compose iuse%->number (cut assoc-ref <> 'iuse%))
(filter (compose prefix-/dev/? (cut assoc-ref <> 'filesystem))
(df-i)))))
(define-syntax-rule (heartbeat (p? body ...) ...)
(let ((heartbeat-cancel? #f))
(when p? body ... (set! heartbeat-cancel? #t)) ...
(unless heartbeat-cancel?
(http-request (current-heartbeat-url)))))
(export-syntax heartbeat)
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