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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 mirror)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-43)
#:use-module (srfi srfi-71)
#:use-module (ice-9 match)
#:use-module (ice-9 threads)
#:use-module (ice-9 exceptions)
#:use-module (rnrs bytevectors)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (prometheus)
#:use-module (logging logger)
#:use-module (json)
#:use-module (fibers)
#:use-module (fibers channels)
#:use-module (guix narinfo)
#:use-module ((guix store) #:select (store-path-hash-part))
#:use-module (nar-herder utils)
#:use-module (nar-herder database)
#:use-module (nar-herder storage)
#:export (start-fetch-changes-fiber))
(define (start-fetch-changes-fiber database metrics-registry
storage-root mirror
cached-compression-management-channel)
(define (request-recent-changes)
(define latest-recent-change
(database-select-latest-recent-change-datetime database))
(define processed-recent-changes
;; Strip datetimes, as these could differ from the mirrors
;; datetimes (since a mirror will often record different change
;; datetimes, since it's delayed in making changes
(map strip-change-datetime
(database-select-recent-changes database latest-recent-change)))
(define (strip-change-datetime change)
`((change . ,(assq-ref change 'change))
(data . ,(assq-ref change 'data))))
(define uri
(string->uri
(string-append mirror "/recent-changes"
(if latest-recent-change
(string-append "?since=" (uri-encode
latest-recent-change))
""))))
(call-with-values
(lambda ()
(retry-on-error
(lambda ()
(log-msg 'INFO "querying for recent changes since "
latest-recent-change)
(with-port-timeouts
(lambda ()
(let ((port
socket
(open-socket-for-uri* uri)))
(http-get uri
#:port port
#:streaming? #t)))
#:timeout 30))
#:times 3
#:delay 15))
(lambda (response body)
(if (= (response-code response) 200)
(let* ((json-body (json->scm body))
(recent-changes
(assoc-ref json-body "recent_changes")))
(log-msg 'INFO "got " (vector-length recent-changes) " changes")
;; Switch to symbol keys and standardise the key order
(vector-map!
(lambda (_ change-details)
`((datetime . ,(assoc-ref change-details "datetime"))
(change . ,(assoc-ref change-details "change"))
(data . ,(assoc-ref change-details "data"))))
recent-changes)
(vector-for-each
(lambda (_ change-details)
;; Guard against processing changes that have already
;; been processed
(unless (member (strip-change-datetime change-details)
processed-recent-changes)
(let ((change (assq-ref change-details 'change)))
(cond
((string=? change "addition")
(let ((narinfo
(call-with-input-string
(assq-ref change-details 'data)
(lambda (port)
(read-narinfo port
"https://narherderdummyvalue")))))
(log-msg 'INFO "processing addition change for "
(uri-path (first (narinfo-uris narinfo)))
" (" (assq-ref change-details 'datetime) ")")
(database-insert-narinfo database
narinfo
#:change-datetime
(assq-ref change-details
'datetime))
(and=> (metrics-registry-fetch-metric metrics-registry
"nar_files_total")
(lambda (metric)
;; Just update this metric if it
;; exists, since if it does, it
;; should be set to a value
(let ((new-files-count
(length (narinfo-uris narinfo))))
(metric-increment
metric
#:by new-files-count
;; TODO This should be
;; checked, rather than
;; assumed to be false
#:label-values '((stored . "false"))))))))
((string=? change "removal")
(let ((store-path (assq-ref change-details 'data)))
(log-msg 'INFO "processing removal change for "
store-path
" (" (assq-ref change-details 'datetime) ")")
(let* ((hash (store-path-hash-part store-path))
(narinfo-details
(database-select-narinfo-by-hash
database
hash)))
(when storage-root
(remove-nar-files-by-hash
database
storage-root
metrics-registry
hash))
(let ((cached-narinfo-files
(database-select-cached-narinfo-files-by-narinfo-id
database
(assq-ref narinfo-details 'id))))
(for-each
(lambda (cached-narinfo-file-details)
;; TODO Delete the file as well
(let ((reply (make-channel)))
(put-message
cached-compression-management-channel
(list 'cached-narinfo-removed
(assq-ref narinfo-details 'id)
(assq-ref cached-narinfo-files 'compression)
(assq-ref cached-narinfo-files 'size)
reply))
(get-message reply)))
cached-narinfo-files))
(database-remove-narinfo database
store-path
#:change-datetime
(assq-ref change-details
'datetime)))))
(else
(error "unimplemented"))))))
recent-changes))
(raise-exception
(make-exception-with-message
(simple-format #f "unknown response: ~A code: ~A"
(uri->string uri)
(response-code response))))))))
(spawn-fiber
(lambda ()
(while #t
(with-exception-handler
(lambda (exn)
(log-msg 'ERROR "fetching changes failed " exn))
request-recent-changes
#:unwind? #t)
(log-msg 'DEBUG "finished requesting recent changes, sleeping")
(sleep 60)))))
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