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-rw-r--r--guix-data-service/utils.scm33
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+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2020 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-data-service utils)
+ #:export (call-with-time-logging
+ with-time-logging))
+
+(define (call-with-time-logging action thunk)
+ (simple-format #t "debug: Starting ~A\n" action)
+ (let* ((start-time (current-time))
+ (result (thunk))
+ (time-taken (- (current-time) start-time)))
+ (simple-format #t "debug: Finished ~A, took ~A seconds\n"
+ action time-taken)
+ result))
+
+(define-syntax-rule (with-time-logging action exp ...)
+ "Log under NAME the time taken to evaluate EXP."
+ (call-with-time-logging action (lambda () exp ...)))