112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
// package prometheuscollector allows to expose metrics for Prometheus.
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//
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// Using the provided collector, you can easily expose metrics for tusd in the
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// Prometheus exposition format (https://prometheus.io/docs/instrumenting/exposition_formats/):
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//
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// handler, err := tusd.NewHandler(…)
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// collector := prometheuscollector.New(handler.Metrics)
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// prometheus.MustRegister(collector)
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package prometheuscollector
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import (
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"sync/atomic"
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"github.com/tus/tusd"
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"strconv"
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"github.com/prometheus/client_golang/prometheus"
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)
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var (
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requestsTotalDesc = prometheus.NewDesc(
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"tusd_requests_total",
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"Total number of requests served by tusd per method.",
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[]string{"method"}, nil)
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errorsTotalDesc = prometheus.NewDesc(
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"tusd_errors_total",
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"Total number of errors per status.",
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[]string{"status", "message"}, nil)
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bytesReceivedDesc = prometheus.NewDesc(
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"tusd_bytes_received",
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"Number of bytes received for uploads.",
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nil, nil)
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uploadsCreatedDesc = prometheus.NewDesc(
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"tusd_uploads_created",
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"Number of created uploads.",
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nil, nil)
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uploadsFinishedDesc = prometheus.NewDesc(
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"tusd_uploads_finished",
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"Number of finished uploads.",
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nil, nil)
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uploadsTerminatedDesc = prometheus.NewDesc(
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"tusd_uploads_terminated",
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"Number of terminted uploads.",
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nil, nil)
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)
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type Collector struct {
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metrics tusd.Metrics
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}
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// New creates a new collector which read froms the provided Metrics struct.
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func New(metrics tusd.Metrics) Collector {
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return Collector{
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metrics: metrics,
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}
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}
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func (_ Collector) Describe(descs chan<- *prometheus.Desc) {
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descs <- requestsTotalDesc
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descs <- errorsTotalDesc
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descs <- bytesReceivedDesc
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descs <- uploadsCreatedDesc
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descs <- uploadsFinishedDesc
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descs <- uploadsTerminatedDesc
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}
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func (c Collector) Collect(metrics chan<- prometheus.Metric) {
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for method, valuePtr := range c.metrics.RequestsTotal {
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metrics <- prometheus.MustNewConstMetric(
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requestsTotalDesc,
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prometheus.GaugeValue,
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float64(atomic.LoadUint64(valuePtr)),
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method,
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)
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}
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for httpError, valuePtr := range c.metrics.ErrorsTotal.Load() {
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metrics <- prometheus.MustNewConstMetric(
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errorsTotalDesc,
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prometheus.GaugeValue,
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float64(atomic.LoadUint64(valuePtr)),
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strconv.Itoa(httpError.Code),
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httpError.Msg,
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)
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}
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metrics <- prometheus.MustNewConstMetric(
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bytesReceivedDesc,
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prometheus.CounterValue,
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float64(atomic.LoadUint64(c.metrics.BytesReceived)),
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)
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metrics <- prometheus.MustNewConstMetric(
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uploadsFinishedDesc,
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prometheus.CounterValue,
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float64(atomic.LoadUint64(c.metrics.UploadsFinished)),
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)
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metrics <- prometheus.MustNewConstMetric(
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uploadsCreatedDesc,
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prometheus.CounterValue,
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float64(atomic.LoadUint64(c.metrics.UploadsCreated)),
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)
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metrics <- prometheus.MustNewConstMetric(
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uploadsTerminatedDesc,
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prometheus.CounterValue,
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float64(atomic.LoadUint64(c.metrics.UploadsTerminated)),
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)
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}
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