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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-data-service utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-71)
#:use-module (ice-9 q)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (ice-9 atomic)
#:use-module (ice-9 format)
#:use-module (ice-9 threads)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 ports internal)
#:use-module (ice-9 suspendable-ports)
#:use-module (lzlib)
#:use-module (fibers)
#:use-module (fibers channels)
#:use-module (fibers operations)
#:use-module (fibers timers)
#:use-module (fibers conditions)
#:use-module (fibers scheduler)
#:use-module (knots timeout)
#:use-module (prometheus)
#:export (call-with-time-logging
with-time-logging
prevent-inlining-for-tests
chunk
chunk!
chunk-for-each!
delete-duplicates/sort!
get-guix-metrics-updater
spawn-port-monitoring-fiber
make-queueing-channel))
(define (call-with-time-logging action thunk)
(simple-format #t "debug: Starting ~A\n" action)
(let ((start-time (current-time)))
(let-values
((result (thunk)))
(let ((time-taken (- (current-time) start-time)))
(simple-format #t "debug: Finished ~A, took ~A seconds\n"
action time-taken))
(apply values result))))
(define-syntax-rule (with-time-logging action exp ...)
"Log under NAME the time taken to evaluate EXP."
(call-with-time-logging action (lambda () exp ...)))
(define-syntax-rule (prevent-inlining-for-tests var)
(set! var var))
(define (chunk lst max-length)
(let ((len (length lst)))
(cond
((= 0 len) '())
((> (length lst) max-length)
(call-with-values (lambda ()
(split-at lst max-length))
(lambda (first-lst rest)
(cons first-lst
(chunk rest max-length)))))
(else
(list lst)))))
(define (chunk! lst max-length)
(let ((len (length lst)))
(cond
((= 0 len) '())
((> (length lst) max-length)
(call-with-values (lambda ()
(split-at! lst max-length))
(lambda (first-lst rest)
(cons first-lst
(chunk! rest max-length)))))
(else
(list lst)))))
(define* (chunk-for-each! proc chunk-size #:rest lsts)
(define (do-one-iteration lsts)
(if (> (length (car lsts))
chunk-size)
(let ((chunks-and-rest
(map (lambda (lst)
(call-with-values (lambda ()
(split-at! lst chunk-size))
(lambda (first-lst rest)
(cons first-lst
rest))))
lsts)))
(apply proc
(map car chunks-and-rest))
(do-one-iteration
(map cdr chunks-and-rest)))
(apply proc lsts)))
(let ((list-lengths (map length lsts)))
(unless (= 1 (length (delete-duplicates list-lengths)))
(error "lists not equal length"))
(unless (= 0 (first list-lengths))
(do-one-iteration lsts)))
#t)
(define* (delete-duplicates/sort! unsorted-lst less #:optional (equal? equal?))
(if (null? unsorted-lst)
unsorted-lst
(let ((sorted-lst (sort! unsorted-lst less)))
(let loop ((lst (cdr sorted-lst))
(last-element (car sorted-lst))
(result (list (car sorted-lst))))
(if (null? lst)
result
(let ((current-element (car lst)))
(if (equal? current-element last-element)
(loop (cdr lst)
last-element
result)
(loop (cdr lst)
current-element
(cons current-element
result)))))))))
(define (get-guix-metrics-updater registry)
(define guix-db "/var/guix/db/db.sqlite")
(define guix-db-wal (string-append guix-db "-wal"))
(let ((guix-db-bytes-metric
(make-gauge-metric registry "guix_db_bytes"))
(guix-db-wal-bytes-metric
(make-gauge-metric registry "guix_db_wal_bytes")))
(lambda ()
(with-exception-handler
(lambda _
#f)
(lambda ()
(metric-set guix-db-bytes-metric (stat:size (stat guix-db)))
(metric-set guix-db-wal-bytes-metric
(if (file-exists? guix-db-wal)
(stat:size (stat guix-db-wal))
0)))
#:unwind? #t))))
(define (spawn-port-monitoring-fiber port error-condition)
(spawn-fiber
(lambda ()
(while #t
(sleep 20)
(with-exception-handler
(lambda (exn)
(simple-format (current-error-port)
"port monitoring fiber failed to connect to ~A: ~A\n"
port exn)
(signal-condition! error-condition))
(lambda ()
(with-port-timeouts
(lambda ()
(let ((sock (socket PF_INET SOCK_STREAM 0)))
(connect sock AF_INET INADDR_LOOPBACK port)
(close-port sock)))
#:timeout 20))
#:unwind? #t)))))
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