implement HE dns handler

he_handler.go

@@ -1,6 +1,72 @@
 package main
 
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"runtime/debug"
+	"time"
+
+	"github.com/parnurzeal/gorequest"
+)
+
+var (
+	HEUrl = "https://dyn.dns.he.net/nic/update?hostname=%s.%s&password=%s&myip=%s"
+)
+
 type HEHandler struct{}
 
 func (handler *HEHandler) DomainLoop(domain *Domain) {
+	defer func() {
+		if err := recover(); err != nil {
+			panicCount++
+			log.Printf("Recovered in %v: %v\n", err, debug.Stack())
+			fmt.Println(identifyPanic())
+			log.Print(identifyPanic())
+			if panicCount < PANIC_MAX {
+				log.Println("Got panic in goroutine, will start a new one... :", panicCount)
+				go handler.DomainLoop(domain)
+			} else {
+				os.Exit(1)
+			}
+		}
+	}()
+
+	for {
+		currentIP, err := getCurrentIP(configuration.IPUrl)
+
+		if err != nil {
+			log.Println("get_currentIP:", err)
+			continue
+		}
+		log.Println("currentIp is:", currentIP)
+
+		for _, subDomain := range domain.SubDomains {
+			log.Printf("%s.%s Start to update record IP...\n", subDomain, domain.DomainName)
+			handler.UpdateIP(domain.DomainName, subDomain, currentIP)
+		}
+
+		//Interval is 5 minutes
+		time.Sleep(time.Minute * INTERVAL)
+	}
+}
+
+func (handler *HEHandler) UpdateIP(domain, subDomain, currentIP string) {
+	request := gorequest.New()
+	resp, body, errs := request.Get(fmt.Sprintf(HEUrl, subDomain, domain, configuration.Password, currentIP)).End()
+
+	if len(errs) > 0 {
+		log.Println("Request error...")
+
+		for _, err := range errs {
+			log.Println("Err:", err.Error())
+		}
+	} else {
+		if resp.StatusCode == http.StatusOK {
+			log.Println("Update IP success:", body)
+		} else {
+			log.Println("Update IP failed:", body)
+		}
+	}
 }