feat: optimize function and add Dockerfile

Signed-off-by: MiaoWoo <admin@yumc.pw>

Dockerfile

@@ -0,0 +1,5 @@
+FROM miaowoo/alpine-glibc
+
+ADD ali-ddns-cli /
+
+CMD [ "/ali-ddns-cli" ]

main.go

@@ -1,13 +1,14 @@
 package main
 
 import (
-	"encoding/json"
 	"flag"
 	"fmt"
-	"github.com/denverdino/aliyungo/dns"
 	"io/ioutil"
 	"net/http"
 	"os"
+	"strings"
+
+	"github.com/denverdino/aliyungo/dns"
 )
 
 var client *dns.Client
@@ -16,9 +17,12 @@ var sub string
 var recordType string
 var recordValue string
 
-var domainRecord *dns.AddDomainRecordArgs
-
 func main() {
+	domainRecord := parseArgs()
+	updateDNSRecord(domainRecord)
+}
+
+func parseArgs() *dns.AddDomainRecordArgs {
 	id := flag.String("id", os.Getenv("ALI_DNS_ID"), "AliId")
 	key := flag.String("key", os.Getenv("ALI_DNS_KEY"), "AliKey")
 
@@ -30,48 +34,52 @@ func main() {
 	recordValue = *flag.String("value", "127.0.0.1", "Redis Server Host")
 
 	flag.Parse()
+	recordValue = getLocalIP()
+	fmt.Println("Local  IP: " + recordValue)
 
-	resp, err := http.Get("http://ip.3322.org")
-	if err != nil {
-		panic(err)
-	}
-
-	str, err := ioutil.ReadAll(resp.Body)
-
-	_ = resp.Body.Close()
-
-	if err != nil {
-		panic(err)
-	}
-
-	recordValue = string(str)
-
-	domainRecord = &dns.AddDomainRecordArgs{
+	return &dns.AddDomainRecordArgs{
 		DomainName: domain,
 		RR:         sub,
 		Type:       recordType,
 		Value:      recordValue,
 	}
+}
 
+func updateDNSRecord(domainRecord *dns.AddDomainRecordArgs) {
 	record, err := listRecord(domainRecord)
-
 	if err != nil {
-		panic(err)
+		panic("List Record ERR: " + err.Error())
 	}
 
-	var re interface{}
-
 	if record != nil {
-		re = updateRecord(record.RecordId, domainRecord)
+		fmt.Println("Record IP: " + record.Value)
+		if record.Value != domainRecord.Value {
+			_, err = updateRecord(record.RecordId, domainRecord)
+			fmt.Println("Update Record " + domainRecord.RR + " ID " + record.RecordId + " Value " + domainRecord.Value)
+		} else {
+			fmt.Println("Record " + domainRecord.RR + " ID " + record.RecordId + " Value " + domainRecord.Value + " Not Change")
+		}
 	} else {
-		re = addRecord(domainRecord)
-	}
-	reByte, err := json.Marshal(re)
-	if err != nil {
-		panic(err)
+		_, err = addRecord(domainRecord)
+		fmt.Println("Add Record " + domainRecord.RR + " Value " + domainRecord.Value)
 	}
 
-	fmt.Println(string(reByte))
+	if err != nil {
+		fmt.Println("Update Or Add Record ERR: " + err.Error())
+	}
+}
+
+func getLocalIP() string {
+	resp, err := http.Get("http://ip.3322.org")
+	if err != nil {
+		panic("Get Network IP ERR: " + err.Error())
+	}
+	str, err := ioutil.ReadAll(resp.Body)
+	defer resp.Body.Close()
+	if err != nil {
+		panic("Read Body Byte ERR: " + err.Error())
+	}
+	return strings.Replace(string(str), "\n", "", -1)
 }
 
 func listRecord(domainRecord *dns.AddDomainRecordArgs) (*dns.RecordTypeNew, error) {
@@ -91,17 +99,15 @@ func listRecord(domainRecord *dns.AddDomainRecordArgs) (*dns.RecordTypeNew, erro
 	return nil, err
 }
 
-func addRecord(domainRecord *dns.AddDomainRecordArgs) *dns.AddDomainRecordResponse {
-	addResult, _ := client.AddDomainRecord(domainRecord)
-	return addResult
+func addRecord(domainRecord *dns.AddDomainRecordArgs) (*dns.AddDomainRecordResponse, error) {
+	return client.AddDomainRecord(domainRecord)
 }
 
-func updateRecord(id string, domainRecord *dns.AddDomainRecordArgs) *dns.UpdateDomainRecordResponse {
-	result, _ := client.UpdateDomainRecord(&dns.UpdateDomainRecordArgs{
+func updateRecord(id string, domainRecord *dns.AddDomainRecordArgs) (*dns.UpdateDomainRecordResponse, error) {
+	return client.UpdateDomainRecord(&dns.UpdateDomainRecordArgs{
 		RecordId: id,
 		RR:       domainRecord.RR,
 		Type:     domainRecord.Type,
 		Value:    domainRecord.Value,
 	})
-	return result
 }