mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-26 10:13:39 +08:00
102 lines
2.9 KiB
Go
102 lines
2.9 KiB
Go
package caddy
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import (
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"net/http"
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"strconv"
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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": sanitizeMethod(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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// Only support the list of "regular" HTTP methods, see
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
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var methodMap = map[string]string{
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"GET": http.MethodGet, "get": http.MethodGet,
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"HEAD": http.MethodHead, "head": http.MethodHead,
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"PUT": http.MethodPut, "put": http.MethodPut,
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"POST": http.MethodPost, "post": http.MethodPost,
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"DELETE": http.MethodDelete, "delete": http.MethodDelete,
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"CONNECT": http.MethodConnect, "connect": http.MethodConnect,
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"OPTIONS": http.MethodOptions, "options": http.MethodOptions,
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"TRACE": http.MethodTrace, "trace": http.MethodTrace,
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"PATCH": http.MethodPatch, "patch": http.MethodPatch,
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}
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// sanitizeMethod sanitizes the method for use as a metric label. This helps
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// prevent high cardinality on the method label. The name is always upper case.
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func sanitizeMethod(m string) string {
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if m, ok := methodMap[m]; ok {
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return m
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}
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return "OTHER"
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}
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