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Preallocate text buffer for telnet

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This commit is contained in:
Alexandre Iooss 2020-10-14 16:44:13 +02:00
parent 868ee12726
commit 67ef07cac5
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GPG Key ID: 6C79278F3FCDCC02
1 changed files with 29 additions and 16 deletions
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45
stream/telnet/telnet.go
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@ -30,16 +30,16 @@ type Options struct {
func Serve(config *Options) {
Cfg = config
if !Cfg.Enabled {
if !config.Enabled {
return
}
currentMessage = make(map[string]*string)
clientCount = make(map[string]int)
listener, err := net.Listen("tcp", Cfg.ListenAddress)
listener, err := net.Listen("tcp", config.ListenAddress)
if err != nil {
log.Printf("Error while listening to the address %s: %s", Cfg.ListenAddress, err)
log.Printf("Error while listening to the address %s: %s", config.ListenAddress, err)
return
}
@ -111,7 +111,7 @@ func Serve(config *Options) {
clientCount[streamID]--
break
}
time.Sleep(time.Duration(Cfg.Delay) * time.Millisecond)
time.Sleep(time.Duration(config.Delay) * time.Millisecond)
}
}(s)
}
@ -128,8 +128,8 @@ func GetNumberConnectedSessions(streamID string) int {
return clientCount[streamID]
}
func asciiChar(pixel byte) string {
asciiChars := []string{"@", "#", "$", "%", "?", "*", "+", ";", ":", ",", ".", " "}
func asciiChar(pixel byte) byte {
asciiChars := []byte{'@', '#', '$', '%', '?', '*', '+', ';', ':', ',', '.', ' '}
return asciiChars[(255-pixel)/22]
}
@ -141,22 +141,35 @@ func StartASCIIArtStream(streamID string, reader io.ReadCloser) {
}
currentMessage[streamID] = new(string)
buff := make([]byte, Cfg.Width*Cfg.Height)
header := "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
var pixel byte
pixelBuff := make([]byte, Cfg.Width*Cfg.Height)
textBuff := strings.Builder{}
textBuff.Grow((2*Cfg.Width + 1) * Cfg.Height)
for {
n, _ := reader.Read(buff)
if n == 0 {
n, err := reader.Read(pixelBuff)
if err != nil {
log.Printf("An error occured while reading input: %s", err)
break
}
imageStr := ""
if n == 0 {
// Stream is finished
break
}
// Header
textBuff.Reset()
for i := 0; i < 42; i++ {
textBuff.WriteByte('\n')
}
// Convert image to ASCII
for j := 0; j < Cfg.Height; j++ {
for i := 0; i < Cfg.Width; i++ {
pixel = buff[Cfg.Width*j+i]
imageStr += asciiChar(pixel) + asciiChar(pixel)
textBuff.WriteByte(asciiChar(pixelBuff[Cfg.Width*j+i]))
textBuff.WriteByte(asciiChar(pixelBuff[Cfg.Width*j+i]))
}
imageStr += "\n"
textBuff.WriteByte('\n')
}
*(currentMessage[streamID]) = header + imageStr
*(currentMessage[streamID]) = textBuff.String()
}
}