mirror of
https://github.com/caddyserver/caddy.git
synced 2025-02-20 14:59:02 +01:00
99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
package reverseproxy
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import (
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"errors"
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"runtime/debug"
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"sync"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"go.uber.org/zap"
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"go.uber.org/zap/zapcore"
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"github.com/caddyserver/caddy/v2"
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)
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var reverseProxyMetrics = struct {
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once sync.Once
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upstreamsHealthy *prometheus.GaugeVec
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logger *zap.Logger
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}{}
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func initReverseProxyMetrics(handler *Handler, registry *prometheus.Registry) {
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const ns, sub = "caddy", "reverse_proxy"
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upstreamsLabels := []string{"upstream"}
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reverseProxyMetrics.once.Do(func() {
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reverseProxyMetrics.upstreamsHealthy = prometheus.NewGaugeVec(prometheus.GaugeOpts{
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Namespace: ns,
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Subsystem: sub,
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Name: "upstreams_healthy",
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Help: "Health status of reverse proxy upstreams.",
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}, upstreamsLabels)
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})
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// duplicate registration could happen if multiple sites with reverse proxy are configured; so ignore the error because
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// there's no good way to capture having multiple sites with reverse proxy. If this happens, the metrics will be
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// registered twice, but the second registration will be ignored.
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if err := registry.Register(reverseProxyMetrics.upstreamsHealthy); err != nil &&
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!errors.Is(err, prometheus.AlreadyRegisteredError{
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ExistingCollector: reverseProxyMetrics.upstreamsHealthy,
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NewCollector: reverseProxyMetrics.upstreamsHealthy,
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}) {
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panic(err)
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}
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reverseProxyMetrics.logger = handler.logger.Named("reverse_proxy.metrics")
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}
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type metricsUpstreamsHealthyUpdater struct {
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handler *Handler
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}
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func newMetricsUpstreamsHealthyUpdater(handler *Handler, ctx caddy.Context) *metricsUpstreamsHealthyUpdater {
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initReverseProxyMetrics(handler, ctx.GetMetricsRegistry())
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reverseProxyMetrics.upstreamsHealthy.Reset()
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return &metricsUpstreamsHealthyUpdater{handler}
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}
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func (m *metricsUpstreamsHealthyUpdater) init() {
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go func() {
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defer func() {
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if err := recover(); err != nil {
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if c := reverseProxyMetrics.logger.Check(zapcore.ErrorLevel, "upstreams healthy metrics updater panicked"); c != nil {
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c.Write(
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zap.Any("error", err),
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zap.ByteString("stack", debug.Stack()),
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)
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}
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}
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}()
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m.update()
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ticker := time.NewTicker(10 * time.Second)
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for {
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select {
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case <-ticker.C:
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m.update()
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case <-m.handler.ctx.Done():
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ticker.Stop()
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return
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}
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}
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}()
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}
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func (m *metricsUpstreamsHealthyUpdater) update() {
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for _, upstream := range m.handler.Upstreams {
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labels := prometheus.Labels{"upstream": upstream.Dial}
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gaugeValue := 0.0
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if upstream.Healthy() {
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gaugeValue = 1.0
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}
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reverseProxyMetrics.upstreamsHealthy.With(labels).Set(gaugeValue)
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}
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}
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