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@ -4,7 +4,6 @@ import ( |
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"context" |
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"context" |
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"net/http" |
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"net/http" |
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"strconv" |
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"strconv" |
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"strings" |
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"sync" |
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"sync" |
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"time" |
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"time" |
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@ -109,7 +108,7 @@ func newMetricsInstrumentedHandler(handler string, mh MiddlewareHandler) *metric |
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func (h *metricsInstrumentedHandler) ServeHTTP(w http.ResponseWriter, r *http.Request, next Handler) error { |
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func (h *metricsInstrumentedHandler) ServeHTTP(w http.ResponseWriter, r *http.Request, next Handler) error { |
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server := serverNameFromContext(r.Context()) |
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server := serverNameFromContext(r.Context()) |
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labels := prometheus.Labels{"server": server, "handler": h.handler} |
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labels := prometheus.Labels{"server": server, "handler": h.handler} |
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method := strings.ToUpper(r.Method) |
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method := sanitizeMethod(r.Method) |
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// the "code" value is set later, but initialized here to eliminate the possibility
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// the "code" value is set later, but initialized here to eliminate the possibility
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// of a panic
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// of a panic
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statusLabels := prometheus.Labels{"server": server, "handler": h.handler, "method": method, "code": ""} |
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statusLabels := prometheus.Labels{"server": server, "handler": h.handler, "method": method, "code": ""} |
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@ -160,6 +159,30 @@ func sanitizeCode(code int) string { |
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return strconv.Itoa(code) |
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return strconv.Itoa(code) |
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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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// taken from https://github.com/prometheus/client_golang/blob/6007b2b5cae01203111de55f753e76d8dac1f529/prometheus/promhttp/instrument_server.go#L298
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// taken from https://github.com/prometheus/client_golang/blob/6007b2b5cae01203111de55f753e76d8dac1f529/prometheus/promhttp/instrument_server.go#L298
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func computeApproximateRequestSize(r *http.Request) int { |
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func computeApproximateRequestSize(r *http.Request) int { |
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s := 0 |
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s := 0 |
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