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;;; Nar Herder
;;;
;;; Copyright © 2021 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 (nar-herder recent-changes)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (ice-9 threads)
#:use-module (fibers)
#:use-module (fibers channels)
#:use-module (logging logger)
#:use-module (prometheus)
#:use-module (web uri)
#:use-module (guix narinfo)
#:use-module (nar-herder database)
#:export (start-recent-change-removal-and-database-dump-fiber
start-recent-change-listener-fiber))
(define (start-recent-change-removal-and-database-dump-fiber database
metrics-registry
database-dump-filename
check-interval
recent-changes-limit)
(define (update-database-dump)
(log-msg 'DEBUG "updating the database dump at " database-dump-filename)
(let ((temp-database-dump-filename
(string-append database-dump-filename ".tmp")))
(when (file-exists? temp-database-dump-filename)
(delete-file temp-database-dump-filename))
(dump-database database temp-database-dump-filename)
(rename-file temp-database-dump-filename
database-dump-filename)
(simple-format (current-error-port)
"updated database dump\n")))
(define recent-changes-count-metric
(metrics-registry-fetch-metric metrics-registry "recent_changes_count"))
(spawn-fiber
(lambda ()
(while #t
(with-exception-handler
(lambda (exn)
(simple-format
(current-error-port)
"exception in recent change removal thread: ~A\n"
exn)
(sleep 120))
(lambda ()
(let ((recent-changes-id-for-deletion
(database-get-recent-changes-id-for-deletion database
recent-changes-limit)))
(when recent-changes-id-for-deletion
(when database-dump-filename
(update-database-dump))
(let ((deleted-recent-changes
(database-call-with-transaction
database
(lambda _
(database-delete-recent-changes-with-id-below
database
recent-changes-id-for-deletion)))))
(metric-decrement recent-changes-count-metric
#:by deleted-recent-changes)
(simple-format (current-error-port)
"deleted ~A recent changes\n"
deleted-recent-changes)))
(sleep check-interval)))
#:unwind? #t)))))
(define (start-recent-change-listener-fiber database
metrics-registry
addition-channel
removal-channel)
(define recent-changes-count-metric
(metrics-registry-fetch-metric metrics-registry "recent_changes_count"))
(define (process-addition-change change-details)
(let ((narinfo
(call-with-input-string
(assq-ref change-details 'data)
(lambda (port)
(read-narinfo port
"https://narherderdummyvalue")))))
(for-each
(lambda (uri)
(log-msg 'DEBUG "processing recent addition of " (uri-path uri))
(put-message addition-channel (list 'addition (uri-path uri))))
(narinfo-uris narinfo))))
(define (process-removal-change change-details)
(log-msg 'DEBUG "processing recent change triggered removal of "
(assq-ref change-details 'data))
(put-message removal-channel
(list 'remove (assq-ref change-details 'data))))
(spawn-fiber
(lambda ()
(let ((recent-changes-count
(database-count-recent-changes database)))
(metric-set recent-changes-count-metric recent-changes-count)
(log-msg 'DEBUG recent-changes-count " recent changes in the database"))
(log-msg 'DEBUG "starting to listen for recent changes")
(let ((after-initial
(database-select-latest-recent-change-datetime database)))
(let loop ((after after-initial)
(last-processed-recent-changes
(database-select-recent-changes database after-initial)))
(sleep 10)
(match
(with-exception-handler
(lambda (exn)
(log-msg 'ERROR "exception in recent change listener " exn)
#f)
(lambda ()
(let* ((recent-changes
(database-select-recent-changes database after))
(unprocessed-recent-changes
(remove
(lambda (change-details)
(member change-details last-processed-recent-changes))
recent-changes)))
(unless (null? unprocessed-recent-changes)
(log-msg 'INFO "processing " (length unprocessed-recent-changes)
" recent changes")
(metric-increment recent-changes-count-metric
#:by (length unprocessed-recent-changes))
(for-each
(lambda (change-details)
(let ((change (assq-ref change-details 'change)))
(cond
((string=? change "addition")
(process-addition-change change-details))
((string=? change "removal")
(process-removal-change change-details))
(else #f))))
unprocessed-recent-changes))
;; Use the unprocessed recent changes here to carry
;; forward all processed changes to the next pass
unprocessed-recent-changes))
#:unwind? #t)
(#f (loop after '()))
(recent-changes
(if (null? recent-changes)
(loop after last-processed-recent-changes)
(loop (assq-ref (last recent-changes)
'datetime)
recent-changes)))))))))
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