mirror of https://github.com/caddyserver/caddy.git
79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
package caddy
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import (
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"net/http"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/collectors"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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// define and register the metrics used in this package.
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func init() {
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prometheus.MustRegister(collectors.NewBuildInfoCollector())
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const ns, sub = "caddy", "admin"
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adminMetrics.requestCount = promauto.NewCounterVec(prometheus.CounterOpts{
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Namespace: ns,
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Subsystem: sub,
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Name: "http_requests_total",
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Help: "Counter of requests made to the Admin API's HTTP endpoints.",
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}, []string{"handler", "path", "code", "method"})
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adminMetrics.requestErrors = promauto.NewCounterVec(prometheus.CounterOpts{
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Namespace: ns,
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Subsystem: sub,
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Name: "http_request_errors_total",
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Help: "Number of requests resulting in middleware errors.",
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}, []string{"handler", "path", "method"})
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}
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// adminMetrics is a collection of metrics that can be tracked for the admin API.
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var adminMetrics = struct {
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requestCount *prometheus.CounterVec
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requestErrors *prometheus.CounterVec
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}{}
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// Similar to promhttp.InstrumentHandlerCounter, but upper-cases method names
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// instead of lower-casing them.
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//
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// Unlike promhttp.InstrumentHandlerCounter, this assumes a "code" and "method"
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// label is present, and will panic otherwise.
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func instrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler) http.HandlerFunc {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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d := newDelegator(w)
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next.ServeHTTP(d, r)
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counter.With(prometheus.Labels{
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"code": sanitizeCode(d.status),
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"method": strings.ToUpper(r.Method),
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}).Inc()
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})
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}
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func newDelegator(w http.ResponseWriter) *delegator {
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return &delegator{
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ResponseWriter: w,
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}
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}
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type delegator struct {
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http.ResponseWriter
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status int
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}
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func (d *delegator) WriteHeader(code int) {
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d.status = code
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d.ResponseWriter.WriteHeader(code)
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}
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func sanitizeCode(s int) string {
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switch s {
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case 0, 200:
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return "200"
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default:
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return strconv.Itoa(s)
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}
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}
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