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client.go
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client.go
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package main
import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"log"
"net/http"
"os/exec"
"github.com/gorilla/websocket"
)
const (
controlC = "^C"
// websocket消息类型
msg_kind_sys = "sys"
msg_kind_log = "log"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
type Client struct {
// The websocket connection.
conn *websocket.Conn
// Context撤销函数,用于关闭日志文件的读取
ctxCancelFunc context.CancelFunc
// 需要读取的日志文件
logFile string
// tail 参数
tailOptions []string
}
// read 读取客户端websocket消息
func (c *Client) read() {
defer func() {
c.conn.Close()
}()
for {
_, message, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
log.Printf("error: %v", err)
}
c.ctxCancelFunc()
break
}
message = bytes.TrimSpace(message)
log.Println("来自客户端消息:", string(message))
if string(message) == controlC {
c.ctxCancelFunc()
break
}
}
log.Println("退出client.read()")
}
// write 向客户端写websocket消息
func (c *Client) write(ctx context.Context) {
defer func() {
c.conn.Close()
}()
if c.logFile == "" {
c.conn.WriteJSON(genWsMsg(msg_kind_sys, "未指定日志文件或日志文件不存在"))
return
}
if !FileExists(c.logFile) {
c.conn.WriteJSON(genWsMsg(msg_kind_sys, fmt.Sprintf("日志文件[%s]不存在", c.logFile)))
return
}
c.tailOptions = append(c.tailOptions, "-f", c.logFile)
cmd := exec.CommandContext(ctx, "tail", c.tailOptions...)
stdout, err := cmd.StdoutPipe()
if err != nil {
c.conn.WriteJSON(genWsMsg(msg_kind_sys, fmt.Sprintf("调用tail命令出错: %v", err)))
return
}
cmd.Start()
reader := bufio.NewReader(stdout)
for {
line, err2 := reader.ReadString('\n')
if err2 != nil || io.EOF == err2 {
log.Println("退出tail命令")
break
}
c.conn.WriteJSON(genWsMsg(msg_kind_log, line))
}
cmd.Wait()
log.Println("退出client.write()")
}
// 创建websocket json消息
func genWsMsg(kind, msg string) map[string]string {
return map[string]string{
"kind": kind,
"msg": msg,
}
}
// serveWs 处理相应客户端的websocket请求
func serveWs(w http.ResponseWriter, r *http.Request, logFile string, tailOptions []string) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
ctx, cancelFunc := context.WithCancel(context.Background())
client := &Client{conn: conn, ctxCancelFunc: cancelFunc, logFile: logFile, tailOptions: tailOptions}
go client.write(ctx)
go client.read()
}