refactored some stuff, added healthcheck support, fixed 'include file' reload not showing in log

internal/net/http/loadbalancer/server.go

@@ -1,67 +1,42 @@
 package loadbalancer
 
 import (
-	"context"
 	"net/http"
-	"sync/atomic"
-	"time"
 
 	"github.com/yusing/go-proxy/internal/net/types"
+	U "github.com/yusing/go-proxy/internal/utils"
+	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
 type (
 	Server struct {
-		Name    string
-		URL     types.URL
-		Weight  weightType
-		handler http.Handler
+		_ U.NoCopy
 
-		pinger    *http.Client
-		available atomic.Bool
+		Name   string
+		URL    types.URL
+		Weight weightType
+
+		handler   http.Handler
+		healthMon health.HealthMonitor
 	}
 	servers []*Server
 )
 
-func NewServer(name string, url types.URL, weight weightType, handler http.Handler) *Server {
+func NewServer(name string, url types.URL, weight weightType, handler http.Handler, healthMon health.HealthMonitor) *Server {
 	srv := &Server{
-		Name:    name,
-		URL:     url,
-		Weight:  weight,
-		handler: handler,
-		pinger:  &http.Client{Timeout: 3 * time.Second},
+		Name:      name,
+		URL:       url,
+		Weight:    weight,
+		handler:   handler,
+		healthMon: healthMon,
 	}
-	srv.available.Store(true)
 	return srv
 }
 
-func (srv *Server) checkUpdateAvail(ctx context.Context) {
-	req, err := http.NewRequestWithContext(
-		ctx,
-		http.MethodHead,
-		srv.URL.String(),
-		nil,
-	)
-	if err != nil {
-		logger.Error("failed to create request: ", err)
-		srv.available.Store(false)
-	}
-
-	resp, err := srv.pinger.Do(req)
-	if err == nil && resp.StatusCode != http.StatusServiceUnavailable {
-		if !srv.available.Swap(true) {
-			logger.Infof("server %s is up", srv.Name)
-		}
-	} else if err != nil {
-		if srv.available.Swap(false) {
-			logger.Warnf("server %s is down: %s", srv.Name, err)
-		}
-	} else {
-		if srv.available.Swap(false) {
-			logger.Warnf("server %s is down: status %s", srv.Name, resp.Status)
-		}
-	}
-}
-
 func (srv *Server) String() string {
 	return srv.Name
 }
+
+func (srv *Server) IsHealthy() bool {
+	return srv.healthMon.IsHealthy()
+}