コード例 #1
0
ファイル: boot.go プロジェクト: kr/doozerd
// Elect chooses a seed node, and returns a connection to a cal.
// If this process is the seed, returns nil.
func elect(name, id, laddr string, b *doozer.Client) *doozer.Client {
	// advertise our presence, since we might become a cal
	nspath := "/ctl/ns/" + name + "/" + id
	r, err := b.Set(nspath, 0, []byte(laddr))
	if err != nil {
		panic(err)
	}

	// fight to be the seed
	_, err = b.Set("/ctl/boot/"+name, 0, []byte(id))
	switch err {
	case doozer.ErrOldRev:
		// we lost, lookup addresses again
		cl := lookupAndAttach(b, name)
		if cl == nil {
			panic("failed to attach after losing election")
		}

		// also delete our entry, since we're not officially a cal yet.
		// it gets set again in peer.Main when we become a cal.
		err := b.Del(nspath, r)
		if err != nil {
			panic(err)
		}

		return cl
	case nil:
		return nil // we are the seed node -- don't attach
	}
	panic(err)
}
コード例 #2
0
ファイル: peer.go プロジェクト: chrismoos/doozerd
func activate(st *store.Store, self string, c *doozer.Client) int64 {
	w := store.NewWatch(st, calGlob)

	for _, base := range store.Getdir(st, calDir) {
		p := calDir + "/" + base
		v, rev := st.Get(p)
		if rev != store.Dir && v[0] == "" {
			seqn, err := c.Set(p, rev, []byte(self))
			if err != nil {
				log.Println(err)
				continue
			}

			w.Stop()
			return seqn
		}
	}

	for ev := range w.C {
		// TODO ev.IsEmpty()
		if ev.IsSet() && ev.Body == "" {
			seqn, err := c.Set(ev.Path, ev.Rev, []byte(self))
			if err != nil {
				log.Println(err)
				continue
			}
			w.Stop()
			return seqn
		}
	}

	return 0
}
コード例 #3
0
ファイル: peer.go プロジェクト: chrismoos/doozerd
func setC(cl *doozer.Client, path, body string, rev int64) {
	_, err := cl.Set(path, rev, []byte(body))
	if err != nil {
		panic(err)
	}
}