/
console.go
138 lines (121 loc) · 2.21 KB
/
console.go
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package main
import (
"errors"
"io"
"os"
"path"
"time"
"gopkg.in/fsnotify.v1"
"vimagination.zapto.org/byteio"
"golang.org/x/net/websocket"
)
type Console struct {
c *Controller
}
func (c Console) Websocket(conn *websocket.Conn) {
conn.PayloadType = websocket.BinaryFrame
r := byteio.StickyLittleEndianReader{Reader: conn}
w := byteio.StickyLittleEndianWriter{Writer: conn}
err := c.handle(&r, &w)
if err != nil {
writeError(&w, err)
}
}
var logPaths = []string{
"logs/server.log",
"logs/latest.log",
"server.log",
}
func (c Console) handle(r *byteio.StickyLittleEndianReader, w *byteio.StickyLittleEndianWriter) error {
id := int(r.ReadInt32())
if r.Err != nil {
return r.Err
}
s := c.c.c.Server(id)
if s == nil {
return ErrUnknownServer
}
s.RLock() //Needed? Path never gets changed!
p := s.Path
s.RUnlock()
var (
f *os.File
err error
logPath string
)
for _, lp := range logPaths {
logPath = path.Join(p, lp)
f, err = os.Open(logPath)
if err == nil {
break
}
}
if f == nil {
return errors.New("unable to open log file")
}
defer func() {
f.Close()
}()
fsw, err := fsnotify.NewWatcher()
if err != nil {
return err
}
logDir := path.Dir(logPath)
fsw.Add(logDir)
defer fsw.Remove(logDir)
pw := partWriter{w}
io.Copy(pw, f)
if w.Err != nil {
return w.Err
}
t := time.NewTimer(time.Second * 10)
for {
select {
case ev := <-fsw.Events:
switch ev.Op {
case fsnotify.Create:
if ev.Name == logPath {
f, err = os.Open(logPath)
if err != nil {
return err
}
}
case fsnotify.Write:
if ev.Name == logPath {
io.Copy(pw, f)
if w.Err != nil {
return w.Err
}
}
case fsnotify.Remove:
if ev.Name == logPath {
f.Close()
}
}
case err = <-fsw.Errors:
case <-t.C:
w.WriteUint8(2) //ping
if w.Err != nil {
return w.Err
}
}
t.Reset(time.Second * 10)
}
}
type partWriter struct {
*byteio.StickyLittleEndianWriter
}
func (pw partWriter) Write(p []byte) (int, error) {
l := len(p)
for len(p) > 0 {
b := p
if len(b) > 65535 {
b = p[:65535]
}
p = p[len(b):]
pw.WriteUint8(1)
pw.WriteUint16(uint16(len(b)))
pw.StickyLittleEndianWriter.Write(b)
}
return l, nil
}