chore: completely drop prometheus support

internal/net/gphttp/middleware/metrics_logger/metrics_logger.go

@@ -1,44 +0,0 @@
-package metricslogger
-
-import (
-	"net"
-	"net/http"
-
-	"github.com/yusing/go-proxy/internal/metrics"
-)
-
-type MetricsLogger struct {
-	ServiceName string `json:"service_name"`
-}
-
-func NewMetricsLogger(serviceName string) *MetricsLogger {
-	return &MetricsLogger{serviceName}
-}
-
-func (m *MetricsLogger) GetHandler(next http.Handler) http.HandlerFunc {
-	return func(rw http.ResponseWriter, req *http.Request) {
-		m.ServeHTTP(rw, req, next.ServeHTTP)
-	}
-}
-
-func (m *MetricsLogger) ServeHTTP(rw http.ResponseWriter, req *http.Request, next http.HandlerFunc) {
-	visitorIP, _, err := net.SplitHostPort(req.RemoteAddr)
-	if err != nil {
-		visitorIP = req.RemoteAddr
-	}
-
-	// req.RemoteAddr had been modified by middleware (if any)
-	lbls := &metrics.HTTPRouteMetricLabels{
-		Service: m.ServiceName,
-		Method:  req.Method,
-		Host:    req.Host,
-		Visitor: visitorIP,
-		Path:    req.URL.Path,
-	}
-
-	next.ServeHTTP(newHTTPMetricLogger(rw, lbls), req)
-}
-
-func (m *MetricsLogger) ResetMetrics() {
-	metrics.GetRouteMetrics().UnregisterService(m.ServiceName)
-}

internal/net/gphttp/middleware/metrics_logger/metrics_response_writer.go

@@ -1,47 +0,0 @@
-package metricslogger
-
-import (
-	"net/http"
-	"time"
-
-	"github.com/yusing/go-proxy/internal/metrics"
-)
-
-type httpMetricLogger struct {
-	http.ResponseWriter
-	timestamp time.Time
-	labels    *metrics.HTTPRouteMetricLabels
-}
-
-// WriteHeader implements http.ResponseWriter.
-func (l *httpMetricLogger) WriteHeader(status int) {
-	l.ResponseWriter.WriteHeader(status)
-	duration := time.Since(l.timestamp)
-	go func() {
-		m := metrics.GetRouteMetrics()
-		m.HTTPReqTotal.Inc()
-		m.HTTPReqElapsed.With(l.labels).Set(float64(duration.Milliseconds()))
-
-		// ignore 1xx
-		switch {
-		case status >= 500:
-			m.HTTP5xx.With(l.labels).Inc()
-		case status >= 400:
-			m.HTTP4xx.With(l.labels).Inc()
-		case status >= 200:
-			m.HTTP2xx3xx.With(l.labels).Inc()
-		}
-	}()
-}
-
-func (l *httpMetricLogger) Unwrap() http.ResponseWriter {
-	return l.ResponseWriter
-}
-
-func newHTTPMetricLogger(w http.ResponseWriter, labels *metrics.HTTPRouteMetricLabels) *httpMetricLogger {
-	return &httpMetricLogger{
-		ResponseWriter: w,
-		timestamp:      time.Now(),
-		labels:         labels,
-	}
-}