diff --git a/main.go b/main.go
index bdf9219..4c0ac49 100644
--- a/main.go
+++ b/main.go
@@ -1,8 +1,10 @@
 package main
 
 import (
+	"bufio"
 	"bytes"
 	_ "embed"
+	"encoding/json"
 	"fmt"
 	"log"
 	"net"
@@ -10,6 +12,7 @@ import (
 	"os"
 	"os/signal"
 	"strings"
+	"sync"
 	"syscall"
 	"text/template"
 	"time"
@@ -21,6 +24,7 @@ var tmpl string
 var report = template.Must(template.New("").Parse(tmpl))
 var write_report chan bool
 var interval = time.Second * 2
+var wr sync.Mutex
 
 type Network struct {
 	Name   string
@@ -67,13 +71,17 @@ func main() {
 						perr = true
 						log.Println(err)
 					}
+					wr.Lock()
 					fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "failed", "Public")
 					fmt.Fprintf(file, "\n")
+					wr.Unlock()
 				} else {
 					perr = false
 					if print {
+						wr.Lock()
 						fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "ok", "Public")
 						fmt.Fprintf(file, "\n")
+						wr.Unlock()
 					}
 				}
 			}(reducer == 0)
@@ -87,14 +95,18 @@ func main() {
 							derr = true
 							log.Println(err)
 						}
+						wr.Lock()
 						fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "failed", Networks[i].Name)
 						fmt.Fprintf(file, "\n")
+						wr.Unlock()
 						// fmt.Fprintf(file, "%s\t%s\t%s\n", now, Networks[i].Name, "failed")
 					} else {
 						derr = false
 						if print {
+							wr.Lock()
 							fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "ok", Networks[i].Name)
 							fmt.Fprintf(file, "\n")
+							wr.Unlock()
 						}
 					}
 				}
@@ -109,7 +121,8 @@ func main() {
 
 	go func() {
 		for {
-			<-time.After(time.Minute * 10)
+			<-time.After(time.Minute * 5)
+			CleanLog()
 			WriteReport()
 		}
 	}()
@@ -118,7 +131,11 @@ func main() {
 		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 			http.ServeFile(w, r, strings.TrimPrefix(r.URL.Path, "/"))
 		})
-		if err := http.ListenAndServe("0.0.0.0:1080", nil); err != nil {
+		port, ok := os.LookupEnv("PORT")
+		if !ok {
+			port = "1080"
+		}
+		if err := http.ListenAndServe("0.0.0.0:"+port, nil); err != nil {
 			log.Fatalln(err)
 		}
 	}()
@@ -127,6 +144,8 @@ func main() {
 	signal.Notify(wait, syscall.SIGINT, syscall.SIGTERM)
 
 	<-wait
+
+	CleanLog()
 	WriteReport()
 }
 
@@ -147,7 +166,9 @@ func WriteReport() {
 	}
 	defer f.Close()
 
+	wr.Lock()
 	data, err := os.ReadFile("network.log")
+	wr.Unlock()
 	if err != nil {
 		log.Println(err)
 		return
@@ -162,6 +183,90 @@ func WriteReport() {
 
 }
 
+type point struct {
+	Time string `json:"x"`
+	Stat string `json:"y"`
+	Name string `json:"name"`
+}
+
+func (p point) GetTime() time.Time {
+	t, _ := time.Parse("2006-01-02 15:04:05", p.Time)
+	return t
+}
+
+func CleanLog() error {
+
+	file, err := os.OpenFile("network.log", os.O_RDONLY|os.O_CREATE, os.ModePerm)
+	if err != nil {
+		log.Println(err)
+		return err
+	}
+
+	last := map[string]*point{}
+	end := map[string]*point{}
+	queue := []*point{}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		pt := &point{}
+		data := scanner.Bytes()
+		err = json.Unmarshal(data[:len(data)-1], pt)
+		if err != nil {
+			log.Println(err)
+			file.Close()
+			return err
+		}
+
+		end[pt.Name] = pt
+
+		last_pt, ok := last[pt.Name]
+		if !ok {
+			last[pt.Name] = pt
+			queue = append(queue, pt)
+		} else {
+			if last_pt.Stat != pt.Stat {
+				last[pt.Name] = pt
+				queue = append(queue, pt)
+			}
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		log.Println(err)
+		return err
+	}
+	file.Close()
+
+	for k, v := range end {
+		if pt, ok := last[k]; ok {
+			if pt.Time != v.Time {
+				queue = append(queue, v)
+			}
+		}
+	}
+
+	wr.Lock()
+	defer wr.Unlock()
+	file, err = os.OpenFile("network.log", os.O_WRONLY|os.O_TRUNC, os.ModePerm)
+	if err != nil {
+		log.Println(err)
+		return err
+	}
+	defer file.Close()
+
+	for i := range queue {
+		b, err := json.Marshal(queue[i])
+		if err != nil {
+			log.Println(err)
+			return err
+		}
+		file.Write(b)
+		file.Write([]byte{',', '\n'})
+	}
+
+	return nil
+
+}
+
 // Get preferred outbound ip of this machine
 func GetOutboundIP(addr string) (net.IP, error) {