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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 (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 (df)
(let ((port (open-input-pipe "df")))
(get-line port)
(let f ((line (get-line port)))
(cond ((eof-object? line)
(close-pipe port)
'())
(else
(cons (map cons
'(filesystem 1k-blocks used available use% mounted-on)
(map match:substring (list-matches "[^ ]+" line)))
(f (get-line port))))))))
(define-public (disk-use%-over? threshold)
(any (lambda (x)
(let ((use% (string->number (string-delete #\% (assoc-ref x 'use%)))))
(< threshold use%)))
(filter (lambda (x)
(let ((fs (assoc-ref x 'filesystem)))
(and fs
(<= 5 (string-length fs))
(string=? (substring fs 0 5) "/dev/"))))
(df))))
(define (df-i)
(let ((port (open-input-pipe "df -i")))
(get-line port)
(let f ((line (get-line port)))
(cond ((eof-object? line)
(close-pipe port)
'())
(else
(cons (map cons
'(filesystem inodes iused ifree iuse% mounted-on)
(map match:substring (list-matches "[^ ]+" line)))
(f (get-line port))))))))
(define-public (disk-iuse%-over? threshold)
(any (lambda (x)
(let ((iuse% (string->number (string-delete #\% (assoc-ref x 'iuse%)))))
(and iuse%
(< threshold iuse%))))
(filter (lambda (x)
(let ((fs (assoc-ref x 'filesystem)))
(and fs
(<= 5 (string-length fs))
(string=? (substring fs 0 5) "/dev/"))))
(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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