add observePeriod option for observer

handler/http2/handler.go

@@ -419,7 +419,11 @@ func (h *http2Handler) observeStats(ctx context.Context) {
 		return
 	}
 
-	ticker := time.NewTicker(5 * time.Second)
+	d := h.md.observePeriod
+	if d < time.Millisecond {
+		d = 5 * time.Second
+	}
+	ticker := time.NewTicker(d)
 	defer ticker.Stop()
 
 	for {

handler/http2/metadata.go

@@ -3,6 +3,7 @@ package http2
 import (
 	"net/http"
 	"strings"
+	"time"
 
 	mdata "github.com/go-gost/core/metadata"
 	mdutil "github.com/go-gost/core/metadata/util"
@@ -17,19 +18,11 @@ type metadata struct {
 	header          http.Header
 	hash            string
 	authBasicRealm  string
+	observePeriod   time.Duration
 }
 
 func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
-	const (
-		header          = "header"
-		probeResistKey  = "probeResistance"
-		probeResistKeyX = "probe_resist"
-		knock           = "knock"
-		hash            = "hash"
-		authBasicRealm  = "authBasicRealm"
-	)
-
-	if m := mdutil.GetStringMapString(md, header); len(m) > 0 {
+	if m := mdutil.GetStringMapString(md, "http.header", "header"); len(m) > 0 {
 		hd := http.Header{}
 		for k, v := range m {
 			hd.Add(k, v)
@@ -37,21 +30,19 @@ func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
 		h.md.header = hd
 	}
 
-	pr := mdutil.GetString(md, probeResistKey)
-	if pr == "" {
-		pr = mdutil.GetString(md, probeResistKeyX)
-	}
-	if pr != "" {
+	if pr := mdutil.GetString(md, "probeResist", "probe_resist"); pr != "" {
 		if ss := strings.SplitN(pr, ":", 2); len(ss) == 2 {
 			h.md.probeResistance = &probeResistance{
 				Type:  ss[0],
 				Value: ss[1],
-				Knock: mdutil.GetString(md, knock),
+				Knock: mdutil.GetString(md, "knock"),
 			}
 		}
 	}
-	h.md.hash = mdutil.GetString(md, hash)
-	h.md.authBasicRealm = mdutil.GetString(md, authBasicRealm)
+	h.md.hash = mdutil.GetString(md, "hash")
+	h.md.authBasicRealm = mdutil.GetString(md, "authBasicRealm")
+
+	h.md.observePeriod = mdutil.GetDuration(md, "observePeriod")
 
 	return nil
 }