add support for loading peerConfig from a url

cmd/gost/peer.go

@@ -16,8 +16,8 @@ import (
 type peerConfig struct {
 	Strategy     string        `json:"strategy"`
 	MaxFails     int           `json:"max_fails"`
-	FailTimeout time.Duration
-	period      time.Duration // the period for live reloading
+	FailTimeout  time.Duration `json:"fail_timeout"`
+	ReloadPeriod time.Duration `json:"reload"`
 	Nodes        []string      `json:"nodes"`
 	group        *gost.NodeGroup
 	baseNodes    []gost.Node
@@ -129,7 +129,7 @@ func (cfg *peerConfig) parse(r io.Reader) error {
 		case "fail_timeout":
 			cfg.FailTimeout, _ = time.ParseDuration(ss[1])
 		case "reload":
-			cfg.period, _ = time.ParseDuration(ss[1])
+			cfg.ReloadPeriod, _ = time.ParseDuration(ss[1])
 		case "peer":
 			cfg.Nodes = append(cfg.Nodes, ss[1])
 		}
@@ -142,7 +142,7 @@ func (cfg *peerConfig) Period() time.Duration {
 	if cfg.Stopped() {
 		return -1
 	}
-	return cfg.period
+	return cfg.ReloadPeriod
 }
 
 // Stop stops reloading.

cmd/gost/route.go

@@ -7,6 +7,7 @@ import (
 	"encoding/base64"
 	"fmt"
 	"net"
+	"net/http"
 	"net/url"
 	"os"
 	"strings"
@@ -67,19 +68,32 @@ func (r *route) parseChain() (*gost.Chain, error) {
 		)
 
 		if cfg := nodes[0].Get("peer"); cfg != "" {
-			f, err := os.Open(cfg)
-			if err != nil {
-				return nil, err
-			}
-
 			peerCfg := newPeerConfig()
 			peerCfg.group = ngroup
 			peerCfg.baseNodes = nodes
-			peerCfg.Reload(f)
-			f.Close()
 
+			if strings.HasPrefix(cfg, "http") {
+				client := http.Client{}
+				resp, err := client.Get(cfg)
+				if err != nil {
+					return nil, err
+				}
+				defer resp.Body.Close()
+				if resp.StatusCode != 200 {
+					return nil, fmt.Errorf("fetch remote resource error, reply status code is not equals to 200")
+				}
+				peerCfg.Reload(resp.Body)
+				go gost.PeriodReloadRemote(peerCfg, cfg)
+			} else {
+				f, err := os.Open(cfg)
+				defer f.Close()
+				if err != nil {
+					return nil, err
+				}
+				peerCfg.Reload(f)
 				go gost.PeriodReload(peerCfg, cfg)
 			}
+		}
 
 		chain.AddNodeGroup(ngroup)
 	}

reload.go

@@ -1,7 +1,9 @@
 package gost
 
 import (
+	"fmt"
 	"io"
+	"net/http"
 	"os"
 	"time"
 
@@ -63,3 +65,39 @@ func PeriodReload(r Reloader, configFile string) error {
 		<-time.After(period)
 	}
 }
+
+// PeriodReloadRemote reloads the remote configFile periodically according to the period of the Reloader r.
+func PeriodReloadRemote(r Reloader, cfg string) error {
+	if r == nil || cfg == "" {
+		return nil
+	}
+
+	client := http.Client{}
+	for {
+		if r.Period() < 0 {
+			log.Log("[reload] stopped:", cfg)
+			return nil
+		}
+		resp, err := client.Get(cfg)
+		if err != nil {
+			return err
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != 200 {
+			return fmt.Errorf("fetch remote resource error, reply status code is not equals to 200")
+		}
+		if err := r.Reload(resp.Body); err != nil {
+			log.Logf("[reload] %s: %s", cfg, err)
+		}
+
+		period := r.Period()
+		if period == 0 {
+			log.Log("[reload] disabled:", cfg)
+			return nil
+		}
+		if period < time.Second {
+			period = time.Second
+		}
+		<-time.After(period)
+	}
+}