优化初次加载

code/initread.go

+package code
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"log"
+	"os"
+	"strings"
+)
+
+func return_byte(file_path string, lines_num int) (string, error) {
+	lines := int64(lines_num)
+	file, err := os.Open(file_path)
+	if err != nil {
+		log.Println(err)
+		return "", err
+	}
+	fileInfo, _ := file.Stat()
+	buf := bufio.NewReader(file)
+	offset := fileInfo.Size() % 8192
+	data := make([]byte, 8192) // 一行的数据
+	totalByte := make([][][]byte, 0)
+	readLines := int64(0)
+	for i := int64(0); i <= fileInfo.Size()/8192; i++ {
+		readByte := make([][]byte, 0) // 读取一页的数据
+		file.Seek(fileInfo.Size()-offset-8192*i, io.SeekStart)
+		data = make([]byte, 8192)
+		n, err := buf.Read(data)
+		if err == io.EOF {
+			if strings.TrimSpace(string(bytes.Trim(data, "\x00"))) != "" {
+				readLines++
+				readByte = append(readByte, data)
+				totalByte = append(totalByte, readByte)
+			}
+			if readLines > lines {
+				break
+			}
+			continue
+		}
+		if err != nil {
+			log.Println("Read file error:", err)
+			return "", err
+		}
+		strs := strings.Split(string(data[:n]), "\n")
+		if len(strs) == 1 {
+			b := bytes.Trim([]byte(strs[0]), "\x00")
+			if len(b) == 0 {
+				continue
+			}
+		}
+		if (readLines + int64(len(strs))) > lines {
+			strs = strs[int64(len(strs))-lines+readLines:]
+		}
+		for j := 0; j < len(strs); j++ {
+			readByte = append(readByte, bytes.Trim([]byte(strs[j]+"\n"), "\x00"))
+		}
+		readByte[len(readByte)-1] = bytes.TrimSuffix(readByte[len(readByte)-1], []byte("\n"))
+		totalByte = append(totalByte, readByte)
+		readLines += int64(len(strs))
+
+		if readLines >= lines {
+			break
+		}
+	}
+	totalByte = ReverseByteArray(totalByte)
+	file.Close()
+	return ByteArrayToString(totalByte), nil
+}
+
+func ReverseByteArray(s [][][]byte) [][][]byte {
+	for from, to := 0, len(s)-1; from < to; from, to = from+1, to-1 {
+		s[from], s[to] = s[to], s[from]
+	}
+	return s
+}
+
+func ByteArrayToString(buf [][][]byte) string {
+	str := make([]string, 0)
+	for _, v := range buf {
+		for _, vv := range v {
+			str = append(str, string(vv))
+		}
+	}
+	return strings.Join(str, "")
+}

code/server.go

@@ -15,13 +15,16 @@ import (
 	"time"
 )
 
-func get_files(direct_path string) []string {
+func get_files(direct_path string) ([]string, error) {
 	var li_file []string
-	files, _ := ioutil.ReadDir(direct_path)
+	files, err := ioutil.ReadDir(direct_path)
+	if err != nil {
+		return nil, err
+	}
 	for _, f := range files {
 		li_file = append(li_file, f.Name())
 	}
-	return li_file
+	return li_file, nil
 }
 func return_res(w http.ResponseWriter, template_path string, data interface{}) {
 	w.Header().Set("Content-Type", "text/html")
@@ -61,10 +64,16 @@ func server(port int, directory string) {
 
 		if li_innerip, ok := queryform["innerip"]; ok {
 			innerip := li_innerip[0]
-			ip_files := get_files(directory + "/" + innerip)
+			ip_files, err := get_files(directory + "/" + innerip)
+			if err != nil {
+				return_error_res(w, directory+"/"+innerip)
+			}
 			if li_server_direc, ok := queryform["server_direc"]; ok {
 				server_direc := li_server_direc[0]
-				ip_server_files := get_files(directory + "/" + innerip + "/" + server_direc)
+				ip_server_files, err := get_files(directory + "/" + innerip + "/" + server_direc)
+				if err != nil {
+					return_error_res(w, directory+"/"+innerip+"/"+server_direc)
+				}
 				if li_filename, ok := queryform["filename"]; ok {
 					file := li_filename[0]
 					str_filepath := innerip + "~~" + server_direc + "~~" + file
@@ -83,7 +92,10 @@ func server(port int, directory string) {
 				return_res(w, "templates/innnerip.html", strings.Join(ip_files, "~~"))
 			}
 		} else {
-			ips := get_files(directory)
+			ips, err := get_files(directory)
+			if err != nil {
+				return_error_res(w, directory)
+			}
 			return_res(w, "templates/index.html", strings.Join(ips, "~~"))
 		}
 
@@ -94,7 +106,7 @@ func server(port int, directory string) {
 	go manager.start()
 
 	var bt bytes.Buffer
-	bt.WriteString("127.0.0.1:")
+	bt.WriteString("0.0.0.0:")
 	bt.WriteString(strconv.Itoa(port))
 	http.ListenAndServe(bt.String(), nil)
 	//log.Fatal()
@@ -110,28 +122,22 @@ func gen(directory string, file_map map[string]map[client]bool) func(ws *websock
 		}
 		filename := queryform["file"][0]
 
-		//初始监听时加载全部内容
+		//初始监听时加载最后500行全部内容
 		file_path := directory
 		for _, s := range strings.Split(filename, "~~") {
 			file_path += "/" + s
 		}
-		fileInfo, err := os.Stat(file_path)
+		_, err = os.Stat(file_path)
 		if err != nil {
 			return
 		}
-		allcontent_file, err := os.Open(file_path)
-		offset := fileInfo.Size()
-		allcontent_msg := make([]byte, offset)
+		lastcontent_msg, err := return_byte(file_path, 500)
 		if err != nil {
-			log.Printf("[seelog] error:%v", err.Error())
-		}
-		_, err = allcontent_file.Read(allcontent_msg)
-		if err != nil {
-			log.Printf("[seelog] error:%v", err.Error())
+			log.Fatal(err)
+			return
 		}
-		all_content := filename + "$$" + string(allcontent_msg)
+		all_content := filename + "$$" + lastcontent_msg
 		manager.broadcast <- []byte(all_content)
-		allcontent_file.Close()
 
 		// 监控文件
 		if _, ok := file_map[filename]; ok {

templates/file_not_exist.html

+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Title</title>
+</head>
+<body>
+<script>alert("File not exist: {{ . }} ,redirect to log page")
+    window.location.url=window.location.host + "/log"
+</script>
+</body>
+</html>
\ No newline at end of file

templates/page.html

@@ -153,7 +153,7 @@
 
     </div>
 </header>
-<div id="log"></div>
+<div id="log" style="padding: 1px"></div>
 </body>
 
 <style>