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;;; Guix Build Coordinator
;;;
;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of the guix-build-coordinator.
;;;
;;; The Guix Build Coordinator is free software; you can redistribute
;;; it and/or modify it under the terms of the GNU General Public
;;; License as published by the Free Software Foundation; either
;;; version 3 of the License, or (at your option) any later version.
;;;
;;; The Guix Build Coordinator 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with the guix-data-service. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-build-coordinator build-allocator)
#:use-module (srfi srfi-1)
#:use-module (guix memoization)
#:use-module (guix-build-coordinator datastore)
#:use-module (guix-build-coordinator coordinator)
#:export (basic-build-allocation-strategy))
(define* (basic-build-allocation-strategy datastore
#:key
(planned-builds-for-agent-limit 2048))
(define (log . args)
(when #f
(simple-format #t "allocator: ~A\n"
(string-join (map (lambda (arg)
(simple-format #f "~A" arg))
args)
" "))))
(define cached/list-builds-for-output
(mlambda (output)
(datastore-list-builds-for-output datastore output)))
(let* ((agents (datastore-list-agents datastore))
(builds (datastore-list-unprocessed-builds datastore))
(setup-failures-hash
(datastore-fetch-setup-failures datastore))
(derived-build-priorities-hash
;; Mapping from build_id to priority, initialised at the individual
;; priorities for the builds
(let ((table (make-hash-table (length builds))))
(for-each (lambda (build)
(hash-set! table
(assq-ref build 'uuid)
(assq-ref build 'priority)))
builds)
table)))
(define (filter-builds-for-agent agent-id)
(define (relevant-setup-failure? setup-failure)
(log "setup failure:" setup-failure)
(let ((failure-reason
(assq-ref setup-failure 'failure-reason)))
(cond
((string=? failure-reason "missing_inputs")
;; missing_inputs setup failures that should be resolved have been
;; filtered out by this point, so this is a relevant setup failure
#t)
((string=? failure-reason "could_not_delete_outputs")
;; This problem might go away, but just don't try the same agent
;; again for now.
(string=? (assq-ref setup-failure 'agent-id)
agent-id))
(else
(error "Unknown setup failure " failure-reason)))))
(lambda (build)
(log "build:" (assq-ref build 'uuid))
(let* ((build-id (assq-ref build 'uuid))
(setup-failures-for-build
(or (hash-ref setup-failures-hash build-id)
'()))
(relevant-setup-failures
(filter relevant-setup-failure?
setup-failures-for-build)))
(log "relevant setup failures:" relevant-setup-failures)
(if (null? relevant-setup-failures)
#t
#f))))
(define (build-sorting-function-for-agent agent-id)
(lambda (a b)
(let ((a-priority (hash-ref derived-build-priorities-hash
(assq-ref a 'uuid)))
(b-priority (hash-ref derived-build-priorities-hash
(assq-ref b 'uuid))))
(< b-priority a-priority))))
(define (limit-planned-builds builds)
(if planned-builds-for-agent-limit
(if (> (length builds) planned-builds-for-agent-limit)
(take builds planned-builds-for-agent-limit)
builds)
builds))
;; Go through the setup failures and look specifically at the
;; missing_inputs ones. Eliminate any missing_inputs failures if all the
;; missing inputs appear to have been built successfully, and update the
;; derived-build-priorities-hash to reflect the priorities of builds based
;; on the builds that would be "unblocked" if they were completed.
(for-each
(lambda (setup-failure-build-id)
(let ((setup-failures (hash-ref setup-failures-hash
setup-failure-build-id))
(setup-failure-build-derived-priority
(hash-ref derived-build-priorities-hash
setup-failure-build-id)))
(for-each
(lambda (setup-failure)
(when (string=? "missing_inputs"
(assq-ref setup-failure 'failure-reason))
(for-each
(lambda (output)
(let ((builds (cached/list-builds-for-output output)))
(if (any (lambda (output-build)
(string=? (or (assq-ref output-build 'result)
"unknown")
"success"))
builds)
;; At least one build for this output has been successful,
;; so delete the setup failure
(hash-remove! setup-failures-hash
setup-failure-build-id)
;; The missing input isn't available, so set the derived
;; priority to be as least as high as this build
(for-each
(lambda (build)
(when (eq? 0 (assq-ref build 'processed))
(let* ((missing-input-build-id
(assq-ref build 'uuid))
(missing-input-build-derived-priority
(hash-ref derived-build-priorities-hash
missing-input-build-id)))
(when (> setup-failure-build-derived-priority
missing-input-build-derived-priority)
;; Bump the priority of the build
(hash-set!
derived-build-priorities-hash
missing-input-build-id
setup-failure-build-derived-priority)))))
builds))))
(datastore-list-setup-failure-missing-inputs
datastore
(assq-ref setup-failure 'id)))))
setup-failures)))
(hash-map->list
(lambda (key value) key)
setup-failures-hash))
(let ((result
(append-map
(lambda (agent-id)
(log "considering builds for" agent-id)
(let ((builds-for-agent
(limit-planned-builds
(sort (filter (filter-builds-for-agent agent-id)
builds)
(build-sorting-function-for-agent agent-id)))))
(map (lambda (build-id ordering)
(list build-id
agent-id
ordering))
(map (lambda (build)
(assq-ref build 'uuid))
builds-for-agent)
(iota (length builds-for-agent)))))
(map (lambda (agent)
(assq-ref agent 'uuid))
agents))))
(log "finished")
result)))
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