diff options
Diffstat (limited to 'metrics.go')
| -rw-r--r-- | metrics.go | 27 |
1 files changed, 25 insertions, 2 deletions
@@ -3,7 +3,6 @@ package caddy import ( "net/http" "strconv" - "strings" "github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus/collectors" @@ -47,7 +46,7 @@ func instrumentHandlerCounter(counter *prometheus.CounterVec, next http.Handler) next.ServeHTTP(d, r) counter.With(prometheus.Labels{ "code": sanitizeCode(d.status), - "method": strings.ToUpper(r.Method), + "method": sanitizeMethod(r.Method), }).Inc() }) } @@ -76,3 +75,27 @@ func sanitizeCode(s int) string { return strconv.Itoa(s) } } + +// Only support the list of "regular" HTTP methods, see +// https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods +var methodMap = map[string]string{ + "GET": http.MethodGet, "get": http.MethodGet, + "HEAD": http.MethodHead, "head": http.MethodHead, + "PUT": http.MethodPut, "put": http.MethodPut, + "POST": http.MethodPost, "post": http.MethodPost, + "DELETE": http.MethodDelete, "delete": http.MethodDelete, + "CONNECT": http.MethodConnect, "connect": http.MethodConnect, + "OPTIONS": http.MethodOptions, "options": http.MethodOptions, + "TRACE": http.MethodTrace, "trace": http.MethodTrace, + "PATCH": http.MethodPatch, "patch": http.MethodPatch, +} + +// sanitizeMethod sanitizes the method for use as a metric label. This helps +// prevent high cardinality on the method label. The name is always upper case. +func sanitizeMethod(m string) string { + if m, ok := methodMap[m]; ok { + return m + } + + return "other" +} |