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;;; mumi -- Mediocre, uh, mail interface
;;; Copyright © 2020 Ricardo Wurmus <rekado@elephly.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 (mumi jobs)
#:use-module (mumi config)
#:use-module (mumi send-email)
#:use-module (redis)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#:export (enqueue
worker-loop))
;; This variable is looked up by 'mu-message-send', uh!
(define-public mu-debug 0)
(define (flatten lst)
(cond ((null? lst) '())
((pair? lst)
((@@ (guile) append) (flatten (car lst))
(flatten (cdr lst))))
(else (list lst))))
;; Take care of opening and closing a connection to redis.
(define-syntax with-redis
(lambda (x)
(syntax-case x ()
((_ exp ...)
(with-syntax (($conn (datum->syntax x '$conn)))
#'(let (($conn (redis-connect)))
(dynamic-wind
(lambda () #t)
(lambda () (redis-send $conn
(flatten (list exp ...))))
(lambda () (redis-close $conn)))))))))
(define-syntax-rule (transaction exps ...)
(list (multi)
exps ...
(exec)))
(define %prefix "mumi:")
(define %waiting (string-append %prefix "waiting"))
(define %processing (string-append %prefix "processing"))
(define (make-getter field)
(lambda (item)
(car (with-redis
(get (list (string-append %prefix field ":" item)))))))
(define get-status (make-getter "status"))
(define get-options (make-getter "options"))
(define get-result (make-getter "result"))
(define (set-status! item status)
(set (list (string-append %prefix "status:" item)
(string-append status ":"
(number->string (current-time))))))
(define (set-options! item options)
(set (list (string-append %prefix "options:" item)
(format #f "~s" options))))
(define (set-result! item result)
(set (list (string-append %prefix "result:" item)
(format #f "~a" result))))
(define (next-waiting)
"Wait for an item to appear on the waiting list, then move it to
the processing list and return the name."
(car (with-redis (brpoplpush (list %waiting %processing 0)))))
(define (enqueue job-type options)
"Append the job to the waiting queue and store the OPTIONS."
(let* ((timestamp (match (gettimeofday)
((s . ms) (format #f "~a~a" s ms))))
(job-name (format #f "~a:~a" job-type timestamp)))
(with-redis
(transaction
(rpush (list %waiting job-name))
(set-status! job-name "waiting")
(set-options! job-name options)))
job-name))
(define (done? item)
"Return the processing result if the ITEM has been processed or #f
if it has not."
(let ((status (get-status item))
(result (get-result item)))
(string-prefix? "success" status)))
(define (process-next processor)
"Get an item from the waiting queue and run PROCESSOR on it.
This procedure blocks until processor exits. Once PROCESSOR exits,
the job status and result are updated."
(let* ((item (next-waiting))
(options (get-options item)))
(with-redis
(set-status! item "processing"))
;; Process the item!
(let ((result (processor item options)))
(with-redis
(transaction
(set-result! item result)
;; TODO: store error message in result if job failed
(if result
(set-status! item "success")
(set-status! item "failed"))
;; We're done processing this.
(lrem (list %processing 0 item)))))
item))
(define (mail-job global job raw-args)
"Process the job JOB with RAW-ARGS."
(define args (call-with-input-string raw-args read))
(format (current-error-port)
"processing~% job: ~a~% options: ~a~%"
job raw-args)
(match (string-split job #\:)
(("mail" timestamp)
(let ((message (compose-message (format #f "~a via web <~a>"
(assoc-ref args 'from)
(assoc-ref global 'sender))
(assoc-ref args 'to)
#:reply-to (assoc-ref args 'reply-to)
#:subject (assoc-ref args 'subject)
#:text (assoc-ref args 'text))))
(send-message message (assoc-ref global 'smtp))))
(_ #f)))
(define (worker-loop global-options)
"Process jobs forever. Blocks if there are no jobs."
(let ((processed (process-next (lambda (job args)
(mail-job global-options job args)))))
(format (current-error-port) "[~a] ~a: ~a~%"
(current-time) (get-status processed) processed))
(worker-loop global-options))
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