init

go-gost/x/handler/metrics/handler.go

@@ -0,0 +1,115 @@
+package metrics
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/go-gost/core/handler"
+	md "github.com/go-gost/core/metadata"
+	xmetrics "github.com/go-gost/x/metrics"
+	"github.com/go-gost/x/registry"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+func init() {
+	registry.HandlerRegistry().Register("metrics", NewHandler)
+}
+
+type metricsHandler struct {
+	handler http.Handler
+	mux     *http.ServeMux
+	md      metadata
+	options handler.Options
+}
+
+func NewHandler(opts ...handler.Option) handler.Handler {
+	options := handler.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &metricsHandler{
+		options: options,
+	}
+}
+
+func (h *metricsHandler) Init(md md.Metadata) (err error) {
+	if err = h.parseMetadata(md); err != nil {
+		return
+	}
+
+	xmetrics.Enable(true)
+
+	h.handler = promhttp.Handler()
+
+	mux := http.NewServeMux()
+	mux.Handle(h.md.path, http.HandlerFunc(h.handleFunc))
+	h.mux = mux
+
+	return
+}
+
+func (h *metricsHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) error {
+	l := &singleConnListener{
+		conn: make(chan net.Conn, 1),
+	}
+	l.send(conn)
+
+	s := http.Server{
+		Handler: h.mux,
+	}
+	s.Serve(l)
+
+	return s.Shutdown(ctx)
+}
+
+func (h *metricsHandler) Close() error {
+	return nil
+}
+
+func (h *metricsHandler) handleFunc(w http.ResponseWriter, r *http.Request) {
+	if auther := h.options.Auther; auther != nil {
+		u, p, _ := r.BasicAuth()
+		if _, ok := auther.Authenticate(r.Context(), u, p); !ok {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+	}
+
+	log := h.options.Logger
+	start := time.Now()
+
+	h.handler.ServeHTTP(w, r)
+
+	log = log.WithFields(map[string]any{
+		"remote":   r.RemoteAddr,
+		"duration": time.Since(start),
+	})
+	log.Infof("%s %s", r.Method, r.RequestURI)
+}
+
+type singleConnListener struct {
+	conn chan net.Conn
+}
+
+func (l *singleConnListener) Accept() (net.Conn, error) {
+	if conn, ok := <-l.conn; ok {
+		return conn, nil
+	}
+	return nil, net.ErrClosed
+}
+
+func (l *singleConnListener) Close() error {
+	return nil
+}
+
+func (l *singleConnListener) Addr() net.Addr {
+	return &net.TCPAddr{}
+}
+
+func (l *singleConnListener) send(conn net.Conn) {
+	l.conn <- conn
+	close(l.conn)
+}