Restructure telnet package
This commit is contained in:
Alexandre Iooss
parent
f0990a630d
commit
88dfc22d81
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@ -0,0 +1,103 @@
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package telnet
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"log"
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"os/exec"
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"gitlab.crans.org/nounous/ghostream/stream"
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)
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// Convert rawvideo to ANSI text
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func streamToTextStream(stream *stream.Stream, text *[]byte, cfg *Options) {
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// Start ffmpeg
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video := make(chan []byte)
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stream.Register(video)
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_, rawvideo, err := startFFmpeg(video, cfg)
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if err != nil {
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log.Printf("Error while starting ffmpeg: %s", err)
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}
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pixelBuff := make([]byte, cfg.Width*cfg.Height)
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textBuff := bytes.Buffer{}
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for {
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n, err := (*rawvideo).Read(pixelBuff)
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if err != nil {
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log.Printf("An error occurred while reading input: %s", err)
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break
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}
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if n == 0 {
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// Stream is finished
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break
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}
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// Header
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textBuff.Reset()
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textBuff.Grow((40*cfg.Width+6)*cfg.Height + 47)
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for i := 0; i < 42; i++ {
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textBuff.WriteByte('\n')
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}
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// Convert image to ASCII
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for i, pixel := range pixelBuff {
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if i%cfg.Width == 0 {
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// New line
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textBuff.WriteString("\033[49m\n")
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}
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// Print two times the character to make a square
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text := fmt.Sprintf("\033[48;2;%d;%d;%dm ", pixel, pixel, pixel)
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textBuff.WriteString(text)
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textBuff.WriteString(text)
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}
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textBuff.WriteString("\033[49m")
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*text = textBuff.Bytes()
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}
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}
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// Start a ffmpeg instance to convert stream into rawvideo
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func startFFmpeg(in <-chan []byte, cfg *Options) (*exec.Cmd, *io.ReadCloser, error) {
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bitrate := fmt.Sprintf("%dk", cfg.Width*cfg.Height/cfg.Delay)
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ffmpegArgs := []string{"-hide_banner", "-loglevel", "error", "-i", "pipe:0",
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"-an", "-vf", fmt.Sprintf("scale=%dx%d", cfg.Width, cfg.Height),
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"-b:v", bitrate, "-minrate", bitrate, "-maxrate", bitrate, "-bufsize", bitrate,
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"-q", "42", "-pix_fmt", "gray", "-f", "rawvideo", "pipe:1"}
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ffmpeg := exec.Command("ffmpeg", ffmpegArgs...)
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// Handle errors output
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errOutput, err := ffmpeg.StderrPipe()
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if err != nil {
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return nil, nil, err
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}
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go func() {
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scanner := bufio.NewScanner(errOutput)
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for scanner.Scan() {
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log.Printf("[TELNET FFMPEG %s] %s", "demo", scanner.Text())
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}
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}()
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// Handle text output
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output, err := ffmpeg.StdoutPipe()
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if err != nil {
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return nil, nil, err
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}
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// Handle stream input
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input, err := ffmpeg.StdinPipe()
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if err != nil {
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return nil, nil, err
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}
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go func() {
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for data := range in {
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input.Write(data)
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}
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}()
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// Start process
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err = ffmpeg.Start()
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return ffmpeg, &output, nil
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}
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@ -0,0 +1,82 @@
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package telnet
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import (
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"log"
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"net"
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"strings"
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"time"
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"gitlab.crans.org/nounous/ghostream/stream"
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)
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func handleViewer(s net.Conn, streams map[string]*stream.Stream, textStreams map[string]*[]byte, cfg *Options) {
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// Prompt user about stream name
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if _, err := s.Write([]byte("[GHOSTREAM]\nEnter stream name: ")); err != nil {
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log.Printf("Error while writing to TCP socket: %s", err)
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s.Close()
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return
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}
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buff := make([]byte, 255)
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n, err := s.Read(buff)
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if err != nil {
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log.Printf("Error while requesting stream ID to telnet client: %s", err)
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s.Close()
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return
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}
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name := strings.TrimSpace(string(buff[:n]))
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if len(name) < 1 {
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// Too short, exit
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s.Close()
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return
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}
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// Wait a bit
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time.Sleep(time.Second)
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// Get requested stream
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st, ok := streams[name]
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if !ok {
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log.Println("Stream does not exist, kicking new Telnet viewer")
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if _, err := s.Write([]byte("This stream is inactive.\n")); err != nil {
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log.Printf("Error while writing to TCP socket: %s", err)
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}
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s.Close()
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return
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}
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// Register new client
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log.Printf("New Telnet viewer for stream %s", name)
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st.IncrementClientCount()
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// Hide terminal cursor
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if _, err = s.Write([]byte("\033[?25l")); err != nil {
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log.Printf("Error while writing to TCP socket: %s", err)
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s.Close()
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return
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}
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// Send stream
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for {
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text, ok := textStreams[name]
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if !ok {
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log.Println("Stream is not converted to text, kicking Telnet viewer")
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if _, err := s.Write([]byte("This stream cannot be opened.\n")); err != nil {
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log.Printf("Error while writing to TCP socket: %s", err)
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}
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break
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}
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// Send text to client
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n, err := s.Write(*text)
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if err != nil || n == 0 {
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log.Printf("Error while sending TCP data: %s", err)
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break
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}
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time.Sleep(time.Duration(cfg.Delay) * time.Millisecond)
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}
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// Close connection
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s.Close()
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st.DecrementClientCount()
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}
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@ -2,20 +2,11 @@
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package telnet
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import (
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"fmt"
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"io"
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"log"
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"net"
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"strings"
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"time"
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)
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var (
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// Cfg contains the different options of the telnet package, see below
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// TODO Config should not be exported
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Cfg *Options
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currentMessage map[string]*string
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clientCount map[string]int
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"gitlab.crans.org/nounous/ghostream/stream"
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)
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// Options holds telnet package configuration
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@ -27,24 +18,25 @@ type Options struct {
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Delay int
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}
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// Serve starts the telnet server and listen to clients
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func Serve(config *Options) {
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Cfg = config
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if !config.Enabled {
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// Serve Telnet server
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func Serve(streams map[string]*stream.Stream, cfg *Options) {
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if !cfg.Enabled {
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// Telnet is not enabled, ignore
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return
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}
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currentMessage = make(map[string]*string)
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clientCount = make(map[string]int)
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// Start conversion routine
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textStreams := make(map[string]*[]byte)
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go autoStartConversion(streams, textStreams, cfg)
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listener, err := net.Listen("tcp", config.ListenAddress)
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// Start TCP server
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listener, err := net.Listen("tcp", cfg.ListenAddress)
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if err != nil {
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log.Printf("Error while listening to the address %s: %s", config.ListenAddress, err)
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return
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log.Fatalf("Error while listening to the address %s: %s", cfg.ListenAddress, err)
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}
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log.Printf("Telnet server listening on %s", cfg.ListenAddress)
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go func() {
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// Handle each new client
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for {
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s, err := listener.Accept()
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if err != nil {
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@ -52,127 +44,26 @@ func Serve(config *Options) {
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continue
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}
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go func(s net.Conn) {
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streamID := ""
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// Request for stream ID
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go handleViewer(s, streams, textStreams, cfg)
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}
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}
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// Convertion routine listen to existing stream and start text conversions
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func autoStartConversion(streams map[string]*stream.Stream, textStreams map[string]*[]byte, cfg *Options) {
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for {
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_, err = s.Write([]byte("[GHOSTREAM]\nEnter stream ID: "))
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if err != nil {
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log.Println("Error while requesting stream ID to telnet client")
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_ = s.Close()
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return
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}
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buff := make([]byte, 255)
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n, err := s.Read(buff)
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if err != nil {
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log.Println("Error while requesting stream ID to telnet client")
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_ = s.Close()
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return
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}
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// Avoid bruteforce
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time.Sleep(3 * time.Second)
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streamID = string(buff[:n])
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streamID = strings.Replace(streamID, "\r", "", -1)
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streamID = strings.Replace(streamID, "\n", "", -1)
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if len(streamID) > 0 {
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if strings.ToLower(streamID) == "exit" {
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_, _ = s.Write([]byte("Goodbye!\n"))
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_ = s.Close()
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return
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}
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if _, ok := currentMessage[streamID]; !ok {
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_, err = s.Write([]byte("Unknown stream ID.\n"))
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if err != nil {
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log.Println("Error while requesting stream ID to telnet client")
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_ = s.Close()
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return
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}
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for name, stream := range streams {
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textStream, ok := textStreams[name]
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if ok {
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// Everything is fine
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continue
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}
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break
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}
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}
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clientCount[streamID]++
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// Hide terminal cursor
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_, _ = s.Write([]byte("\033[?25l"))
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for {
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n, err := s.Write([]byte(*currentMessage[streamID]))
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if err != nil {
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log.Printf("Error while sending TCP data: %s", err)
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_ = s.Close()
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clientCount[streamID]--
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break
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// Start conversion
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log.Print("Starting text conversion of %s", name)
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textStream = &[]byte{}
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textStreams[name] = textStream
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go streamToTextStream(stream, textStream, cfg)
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}
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if n == 0 {
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_ = s.Close()
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clientCount[streamID]--
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break
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}
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time.Sleep(time.Duration(config.Delay) * time.Millisecond)
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}
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}(s)
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}
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}()
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log.Println("Telnet server initialized")
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}
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// GetNumberConnectedSessions returns the numbers of clients that are viewing the stream through a telnet shell
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func GetNumberConnectedSessions(streamID string) int {
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if Cfg == nil || !Cfg.Enabled {
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return 0
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}
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return clientCount[streamID]
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}
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// StartASCIIArtStream send all packets received by ffmpeg as ASCII Art to telnet clients
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func StartASCIIArtStream(streamID string, reader io.ReadCloser) {
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if !Cfg.Enabled {
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_ = reader.Close()
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return
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}
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currentMessage[streamID] = new(string)
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pixelBuff := make([]byte, Cfg.Width*Cfg.Height)
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textBuff := strings.Builder{}
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for {
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n, err := reader.Read(pixelBuff)
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if err != nil {
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log.Printf("An error occurred while reading input: %s", err)
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break
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}
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if n == 0 {
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// Stream is finished
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break
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}
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// Header
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textBuff.Reset()
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textBuff.Grow((40*Cfg.Width+6)*Cfg.Height + 47)
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for i := 0; i < 42; i++ {
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textBuff.WriteByte('\n')
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}
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// Convert image to ASCII
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for i, pixel := range pixelBuff {
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if i%Cfg.Width == 0 {
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// New line
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textBuff.WriteString("\033[49m\n")
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}
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// Print two times the character to make a square
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text := fmt.Sprintf("\033[48;2;%d;%d;%dm ", pixel, pixel, pixel)
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textBuff.WriteString(text)
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textBuff.WriteString(text)
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}
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textBuff.WriteString("\033[49m")
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*(currentMessage[streamID]) = textBuff.String()
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time.Sleep(time.Second)
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}
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}
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@ -1,41 +1,38 @@
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package telnet
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import (
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"bytes"
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"io/ioutil"
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"math/rand"
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"net"
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"testing"
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"time"
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"gitlab.crans.org/nounous/ghostream/stream"
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)
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// TestTelnetOutput creates a TCP client that connects to the server and get one image.
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func TestTelnetOutput(t *testing.T) {
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// Try to start Telnet server while it is disabled
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Serve(&Options{Enabled: false})
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StartASCIIArtStream("demo", ioutil.NopCloser(bytes.NewReader([]byte{})))
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if GetNumberConnectedSessions("demo") != 0 {
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t.Fatalf("Mysteriously found %d connected clients", GetNumberConnectedSessions("demo"))
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}
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streams := make(map[string]*stream.Stream)
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go Serve(streams, &Options{Enabled: false})
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// FIXME test connect
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// Enable and start Telnet server
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Serve(&Options{
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cfg := Options{
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Enabled: true,
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ListenAddress: "127.0.0.1:8023",
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Width: 80,
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Height: 45,
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Delay: 50,
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})
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}
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go Serve(streams, &cfg)
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// FIXME test connect
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// Generate a random image, that should be given by FFMPEG
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sampleImage := make([]byte, Cfg.Width*Cfg.Height)
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/*sampleImage := make([]byte, cfg.Width*cfg.Height)
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rand.Read(sampleImage)
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reader := ioutil.NopCloser(bytes.NewBuffer(sampleImage))
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// Send the image to the server
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StartASCIIArtStream("demo", reader)
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// Connect to the Telnet server
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client, err := net.Dial("tcp", Cfg.ListenAddress)
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client, err := net.Dial("tcp", cfg.ListenAddress)
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if err != nil {
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t.Fatalf("Error while connecting to the TCP server: %s", err)
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}
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@ -46,7 +43,7 @@ func TestTelnetOutput(t *testing.T) {
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t.Fatalf("Error while closing TCP connection: %s", err)
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}
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client, err = net.Dial("tcp", Cfg.ListenAddress)
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client, err = net.Dial("tcp", cfg.ListenAddress)
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if err != nil {
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t.Fatalf("Error while connecting to the TCP server: %s", err)
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}
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@ -110,5 +107,5 @@ func TestTelnetOutput(t *testing.T) {
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time.Sleep(time.Second)
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if GetNumberConnectedSessions("demo") != 0 {
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t.Fatalf("Expected no telnet client, found %d", GetNumberConnectedSessions("demo"))
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}
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}*/
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}
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@ -157,7 +157,7 @@ func statisticsHandler(w http.ResponseWriter, r *http.Request) {
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stream, ok := streams[name]
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if ok {
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// Get number of output channels
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userCount = stream.Count()
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userCount = stream.ClientCount()
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}
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// Display connected users statistics
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