Feature: add experimental provider

adapters/provider/healthcheck.go

@@ -0,0 +1,53 @@
+package provider
+
+import (
+	"context"
+	"time"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+const (
+	defaultURLTestTimeout = time.Second * 5
+)
+
+type HealthCheckOption struct {
+	URL      string
+	Interval uint
+}
+
+type healthCheck struct {
+	url     string
+	proxies []C.Proxy
+	ticker  *time.Ticker
+}
+
+func (hc *healthCheck) process() {
+	go hc.check()
+	for range hc.ticker.C {
+		hc.check()
+	}
+}
+
+func (hc *healthCheck) check() {
+	ctx, cancel := context.WithTimeout(context.Background(), defaultURLTestTimeout)
+	for _, proxy := range hc.proxies {
+		go proxy.URLTest(ctx, hc.url)
+	}
+
+	<-ctx.Done()
+	cancel()
+}
+
+func (hc *healthCheck) close() {
+	hc.ticker.Stop()
+}
+
+func newHealthCheck(proxies []C.Proxy, url string, interval uint) *healthCheck {
+	ticker := time.NewTicker(time.Duration(interval) * time.Second)
+	return &healthCheck{
+		proxies: proxies,
+		url:     url,
+		ticker:  ticker,
+	}
+}