spongy/spongy.cgi/network.go

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package main
import (
"bufio"
"fmt"
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"github.com/go-fsnotify/fsnotify"
"io/ioutil"
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"os"
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"path"
"strings"
"time"
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)
type Network struct {
name string
currentLog string
lineno int64
basePath string
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seq int
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}
type Update struct {
Lines []string
LastEventId string
}
func NewNetwork(basePath string) (*Network) {
return &Network{
basePath: basePath,
}
}
func (nw *Network) LastEventId() string {
return fmt.Sprintf("%s:%s:%d", nw.name, nw.currentLog, nw.lineno)
}
func (nw *Network) SetPosition(filename string, lineno int64) {
nw.currentLog = filename
nw.lineno = lineno
}
func (nw *Network) Tail(out chan<- *Update) error {
if nw.currentLog == "" {
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var err error
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currentfn := path.Join(nw.basePath, "log", "current")
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nw.currentLog, err = os.Readlink(currentfn)
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if err != nil {
return err
}
}
filepath := path.Join(nw.basePath, "log", nw.currentLog)
f, err := os.Open(filepath)
if err != nil {
return err
}
defer f.Close()
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
defer watcher.Close()
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watcher.Add(filepath)
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for {
lines := make([]string, 0)
bf := bufio.NewScanner(f)
for bf.Scan() {
t := bf.Text()
nw.lineno += 1
parts := strings.Split(t, " ")
if (len(parts) >= 4) && (parts[2] == "NEXTLOG") {
watcher.Remove(filepath)
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filename := parts[3]
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filepath = path.Join(NetworkDir, filename)
f.Close()
f, err = os.Open(filepath)
if err != nil {
return err
}
watcher.Add(filepath)
nw.lineno = 0
}
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lines = append(lines, t)
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}
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if len(lines) > 0 {
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update := Update{
Lines: lines,
LastEventId: nw.LastEventId(),
}
out <- &update
}
select {
case _ = <-watcher.Events:
// Somethin' happened!
case err := <-watcher.Errors:
return err
}
}
return nil
}
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func (nw *Network) Write(data []byte) {
epoch := time.Now().Unix()
pid := os.Getpid()
filename := fmt.Sprintf("%d-%d-%d.txt", epoch, pid, nw.seq)
filepath := path.Join(nw.basePath, "outq", filename)
ioutil.WriteFile(filepath, data, 0750)
nw.seq += 1
}