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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 metrics)
#:use-module (srfi srfi-9)
#:use-module (ice-9 match)
#:use-module (ice-9 exceptions)
#:use-module (guix-build-coordinator datastore)
#:export (make-metrics-registry
write-metrics
make-gauge-metric
metric-increment
metric-decrement
metric-set))
(define namespace
"guixbuildcoordinator")
(define-record-type <metrics-registry>
(make-metrics-registry-record metrics-hash)
metrics-registry?
(metrics-hash metrics-registry-metrics-hash))
(define (make-metrics-registry)
(make-metrics-registry-record (make-hash-table)))
(define-record-type <metric>
(make-metric type name values registry docstring labels label-preset-values)
metric?
(type metric-type)
(name metric-name)
(values metric-values)
(registry metric-registry)
(docstring metric-docstring)
(labels metric-labels)
(label-preset-values metric-label-preset-values))
(define (metrics-registry-add-metric registry name metric)
(let ((metrics-hash
(metrics-registry-metrics-hash registry)))
(when (hash-ref metrics-hash name)
(raise-exception
(make-exception-with-message
(simple-format #f "metric ~A already exists"
name))))
(hash-set! metrics-hash name metric)
metric))
(define* (make-gauge-metric registry name
#:key
docstring
(labels '())
(label-preset-values '()))
(metrics-registry-add-metric
registry
name
(make-metric 'gauge
name
(make-hash-table)
registry
docstring
labels
label-preset-values)))
(define (canonicalise-label-values-for-metric metric
label-values)
label-values)
(define* (metric-increment metric
#:key
(by 1)
(label-values '()))
(unless (memq (metric-type metric)
'(counter gauge))
(error "can only increment counter and gauge metrics"))
(unless (positive? by)
(error "can only increment positive values"))
(let ((canonical-labels
(canonicalise-label-values-for-metric metric label-values))
(hash
(metric-values metric)))
(hash-set! hash
canonical-labels
(+ by
(or (hash-ref hash canonical-labels)
0)))))
(define* (metric-decrement metric
#:key
(by 1)
(label-values '()))
(unless (memq (metric-type metric)
'(gauge))
(error "can only increment gauge metrics"))
(let ((canonical-labels
(canonicalise-label-values-for-metric metric label-values))
(hash
(metric-values metric)))
(hash-set! hash
canonical-labels
(+ (* -1 by)
(or (hash-ref hash canonical-labels)
0)))))
(define* (metric-set metric value
#:key (label-values '()))
(unless (memq (metric-type metric)
'(gauge))
(error "can only set gauge metrics"))
(hash-set! (metric-values metric)
(canonicalise-label-values-for-metric metric label-values)
value))
(define (write-metrics registry port)
(hash-for-each
(lambda (name metric)
(hash-for-each
(lambda (label-values value)
(simple-format
port
"~A~A ~A\n"
name
(if (null? label-values)
""
(string-append
"{"
(string-join (map
(match-lambda
((label . value)
(simple-format
#f
"~A=\"~A\""
label value)))
label-values)
",")
"}"))
value))
(metric-values metric)))
(metrics-registry-metrics-hash registry)))
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