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helpers.go
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/
helpers.go
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package main
import (
"bytes"
"encoding/gob"
"fmt"
"net"
"os"
"sync"
"time"
"github.com/ei-projects/eimaster/pkg/eimasterlib"
)
func encodeASCII(src []uint8) string {
var buf bytes.Buffer
for _, b := range src {
if b < 32 || b > 126 {
buf.WriteRune('.')
} else {
buf.WriteByte(b)
}
}
return buf.String()
}
func getHexDump(bytes []byte) string {
result := ""
offset := 0
for offset < len(bytes) {
chunkLen := len(bytes) - offset
if chunkLen > 16 {
chunkLen = 16
}
chunk := ""
for i := 0; i < chunkLen; i++ {
if i > 0 && i%8 == 0 {
chunk += " "
}
chunk += fmt.Sprintf("%02X ", bytes[offset+i])
}
result += fmt.Sprintf("%08X %-49s |%s|\n", offset,
chunk, encodeASCII(bytes[offset:offset+chunkLen]))
offset += chunkLen
}
result += fmt.Sprintf("%08X\n", offset)
return result
}
func pingServer(srv *eimasterlib.EIServerInfo, timeout time.Duration) {
conn, err := net.DialUDP("udp", nil, &srv.Addr)
if err != nil {
log.Errorf("net.DialUDP failed: %s", err)
return
}
defer conn.Close()
startTime := time.Now()
conn.SetDeadline(startTime.Add(timeout))
msg := []byte{3, 0, 0, 0}
for i := 0; i < 5; i++ {
n, err := conn.Write(msg)
if n < len(msg) || err != nil {
log.Errorf("conn.Write failed: %s. %d bytes were read", err, n)
return
}
}
ping := 0
buf := make([]byte, 256)
n, _ := conn.Read(buf)
if n > 0 {
ping = int(time.Since(startTime).Milliseconds())
if ping == 0 {
ping = 1
} else if ping < 0 {
ping = 0
}
}
srv.Ping = ping
}
func pingServers(servers []eimasterlib.EIServerInfo) {
var wg sync.WaitGroup
for i := range servers {
wg.Add(1)
go func(i int) {
defer wg.Done()
pingServer(&servers[i], 2500*time.Millisecond)
}(i)
}
wg.Wait()
}
func saveDataToGOB(path string, data interface{}) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
encoder := gob.NewEncoder(f)
return encoder.Encode(data)
}
func loadDataFromGOB(path string, data interface{}) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
decoder := gob.NewDecoder(f)
return decoder.Decode(data)
}