mirror of https://github.com/nealey/spongy
146 lines
2.5 KiB
Go
146 lines
2.5 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"github.com/go-fsnotify/fsnotify"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"time"
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)
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type Network struct {
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name string
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currentLog string
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lineno int64
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basePath string
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seq int
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}
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type Update struct {
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Lines []string
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LastEventId string
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}
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func NewNetwork(basePath string) (*Network) {
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return &Network{
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basePath: basePath,
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}
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}
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func (nw *Network) LastEventId() string {
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return fmt.Sprintf("%s:%s:%d", nw.name, nw.currentLog, nw.lineno)
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}
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func (nw *Network) SetPosition(filename string, lineno int64) {
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nw.currentLog = filename
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nw.lineno = lineno
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}
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func (nw *Network) Tail(out chan<- *Update) error {
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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 {
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return err
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}
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}
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filepath := path.Join(nw.basePath, "log", nw.currentLog)
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f, err := os.Open(filepath)
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if err != nil {
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return err
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}
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defer f.Close()
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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return err
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}
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defer watcher.Close()
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watcher.Add(filepath)
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// XXX: some way to stop this?
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for {
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lines := make([]string, 0)
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bf := bufio.NewScanner(f)
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for bf.Scan() {
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t := bf.Text()
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nw.lineno += 1
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parts := strings.Split(t, " ")
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if (len(parts) >= 4) && (parts[2] == "NEXTLOG") {
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watcher.Remove(filepath)
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filename := parts[3]
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filepath = path.Join(nw.basePath, "log", filename)
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f.Close()
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f, err = os.Open(filepath)
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if err != nil {
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return err
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}
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watcher.Add(filepath)
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nw.lineno = 0
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}
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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{
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Lines: lines,
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LastEventId: nw.LastEventId(),
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}
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out <- &update
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}
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select {
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case _ = <-watcher.Events:
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// Somethin' happened!
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case err := <-watcher.Errors:
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return err
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}
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}
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return nil
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}
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func (nw *Network) Write(data []byte) {
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epoch := time.Now().Unix()
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pid := os.Getpid()
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filename := fmt.Sprintf("%d-%d-%d.txt", epoch, pid, nw.seq)
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filepath := path.Join(nw.basePath, "outq", filename)
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ioutil.WriteFile(filepath, data, 0750)
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nw.seq += 1
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}
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func Networks(basePath string) (found []*Network) {
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dir, err := os.Open(basePath)
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if err != nil {
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return
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}
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defer dir.Close()
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entities, _ := dir.Readdirnames(0)
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for _, fn := range entities {
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netdir := path.Join(basePath, fn)
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_, err = os.Stat(path.Join(netdir, "nick"))
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if err != nil {
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continue
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}
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nw := NewNetwork(netdir)
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found = append(found, nw)
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}
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return
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}
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