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