日志的优雅写法

bin/main.go

@@ -1,9 +1,11 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"net/http"
 	"runtime"
+	"time"
 
 	"regexp"
 	"strconv"
@@ -12,9 +14,9 @@ import (
 	_ "github.com/go-sql-driver/mysql"
 )
 
-func init() {
+//func init() {
-	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
+//	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
-}
+//}
 
 // string 转换为 int, 如果转换失败则返回默认值
 func stringToInt(str string, defaultValue int) int {
@@ -28,6 +30,11 @@ func stringToInt(str string, defaultValue int) int {
 	return value
 }
 
+func LogComponent(startTime int64, r *http.Request) {
+	endTime := fmt.Sprintf("%dms", (time.Now().UnixNano()-startTime)/1000000)
+	log.Println(r.Method, r.URL.Path, endTime)
+}
+
 func main() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
@@ -36,19 +43,19 @@ func main() {
 
 	// URL 格式: /img/{type}-{id}.{format}?width=320&height=320&fit=cover
 	http.HandleFunc("/img/", func(w http.ResponseWriter, r *http.Request) {
-		log.Println(r.Method, r.URL.Path)
+		defer LogComponent(time.Now().UnixNano(), r) // 最后打印日志
+
 		reg := regexp.MustCompile(`^/img/([0-9a-zA-Z]+)-([0-9a-zA-Z]+).(jpg|jpeg|png|webp)$`)
 		matches := reg.FindStringSubmatch(r.URL.Path)
 		if len(matches) != 4 {
-			log.Println("URL 格式错误", matches)
+			http.Error(w, "URL 格式错误", http.StatusNotFound)
-			w.WriteHeader(http.StatusNotFound)
 			return
 		}
 		group, id, format, width, height, fit := matches[1], matches[2], matches[3], stringToInt(r.URL.Query().Get("width"), 0), stringToInt(r.URL.Query().Get("height"), 0), r.URL.Query().Get("fit")
 		content, err := mysqlConnection.GetImageContent(group, id)
 		if err != nil {
 			log.Println("获取图片失败", format, err)
-			w.WriteHeader(http.StatusNotFound)
+			http.Error(w, err.Error(), http.StatusNotFound)
 			return
 		}
 		var img models.Image
@@ -56,7 +63,7 @@ func main() {
 		data, err := img.ToWebP(width, height, fit)
 		if err != nil {
 			log.Println("转换图片失败", err)
-			w.WriteHeader(http.StatusBadRequest)
+			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
 
@@ -67,7 +74,8 @@ func main() {
 
 	// URL 格式: /webp/{type}-{id}-{version}-{width}-{height}-{fit}.{format}
 	http.HandleFunc("/webp/", func(w http.ResponseWriter, r *http.Request) {
-		log.Println(r.Method, r.URL.Path)
+		defer LogComponent(time.Now().UnixNano(), r) // 最后打印日志
+
 		reg := regexp.MustCompile(`^/webp/([0-9a-zA-Z]+)-([0-9a-zA-Z]+)-([0-9a-zA-Z]+)-([0-9]+)-([0-9]+)-([a-zA-Z]+).(jpg|jpeg|png|webp)$`)
 		matches := reg.FindStringSubmatch(r.URL.Path)
 		if len(matches) != 8 {