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;;; Guix QA Frontpage
;;;
;;; Copyright © 2023 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-qa-frontpage utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-71)
#:use-module (ice-9 match)
#:use-module (ice-9 threads)
#:use-module (fibers)
#:use-module (fibers channels)
#:use-module ((guix-build-coordinator utils) #:select (with-port-timeouts))
#:use-module (guix-build-coordinator utils fibers)
#:export (fiberize
fibers-map
fibers-batch-for-each
fibers-for-each
non-blocking)
#:re-export (with-fibers-port-timeouts))
(define* (fiberize proc #:key (parallelism 1))
(let ((channel (make-channel)))
(for-each
(lambda _
(spawn-fiber
(lambda ()
(while #t
(let ((reply-channel args (car+cdr
(get-message channel))))
(put-message
reply-channel
(with-exception-handler
(lambda (exn)
(cons 'exception exn))
(lambda ()
(with-throw-handler #t
(lambda ()
(call-with-values
(lambda ()
(apply proc args))
(lambda vals
(cons 'result vals))))
(lambda _
(backtrace))))
#:unwind? #t)))))
#:parallel? #t))
(iota parallelism))
(lambda args
(let ((reply-channel (make-channel)))
(put-message channel (cons reply-channel args))
(match (get-message reply-channel)
(('result . vals) (apply values vals))
(('exception . exn) (raise-exception exn)))))))
(define (fibers-map proc . lists)
(let ((channels
(apply
map
(lambda args
(let ((channel (make-channel)))
(spawn-fiber
(lambda ()
(put-message
channel
(with-exception-handler
(lambda (exn)
(cons 'exception exn))
(lambda ()
(with-throw-handler #t
(lambda ()
(call-with-values
(lambda ()
(apply proc args))
(lambda val
(cons 'result val))))
(lambda _
(backtrace))))
#:unwind? #t))))
channel))
lists)))
(map
(match-lambda
(('result . val) val)
(('exception . exn) (raise-exception exn)))
(map get-message channels))))
(define (fibers-batch-for-each proc batch-size . lists)
;; Like split-at, but don't care about the order of the resulting lists, and
;; don't error if the list is shorter than i elements
(define (split-at* lst i)
(let lp ((l lst) (n i) (acc '()))
(if (or (<= n 0) (null? l))
(values (reverse! acc) l)
(lp (cdr l) (- n 1) (cons (car l) acc)))))
;; As this can be called with lists with tens of thousands of items in them,
;; batch the
(define (get-batch lists)
(let ((split-lists
(map (lambda (lst)
(let ((batch rest (split-at* lst batch-size)))
(cons batch rest)))
lists)))
(values (map car split-lists)
(map cdr split-lists))))
(let loop ((lists lists))
(call-with-values
(lambda ()
(get-batch lists))
(lambda (batch rest)
(apply fibers-map proc batch)
(unless (null? (car rest))
(loop rest)))))
*unspecified*)
(define (fibers-for-each proc . lists)
(apply fibers-batch-for-each proc 20 lists))
(define (non-blocking thunk)
(let ((channel (make-channel)))
(call-with-new-thread
(lambda ()
(with-exception-handler
(lambda (exn)
(put-message channel `(exception ,exn)))
(lambda ()
(with-throw-handler #t
(lambda ()
(call-with-values
(lambda ()
;; This is mostly to set non fibers IO waiters
(with-port-timeouts thunk
#:timeout (* 300 1000)))
(lambda values
(put-message channel `(values ,@values)))))
(lambda args
(display (backtrace) (current-error-port))
(newline (current-error-port)))))
#:unwind? #t)))
(match (get-message channel)
(('values . results)
(apply values results))
(('exception . exn)
(raise-exception exn)))))
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