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
}
func mustWait(s *store.Store, n int64) <-chan store.Event {
c, err := s.Wait(store.Any, n)
if err != nil {
panic(err)
}
return c
}
func Clean(s *store.Store, p paxos.Proposer) {
timer := timer.New("/session/**", timer.OneSecond, s)
for tick := range timer.C {
_, cas := s.Get(tick.Path)
paxos.Del(p, tick.Path, cas)
}
}
// This thing keeps track of who is supposed to be in the cluster for every
// seqn. It also remembers the network address of every member.
// TODO remove the `start` param when store.Get provides a version
func NewRegistrar(st *store.Store, start uint64, alpha int) *Registrar {
rg := &Registrar{
alpha: alpha,
st: st,
evs: st.Watch("**"), // watch absolutely everything
lookupCh: make(chan *lookup),
lookups: new(lookupQueue),
}
go rg.process(start, readdirMap(st, membersKey), readdirMap(st, slotKey))
return rg
}
func Clean(st *store.Store) {
cl := &cleaner{
st: st,
table: make(map[string]uint64),
logger: util.NewLogger("clean"),
}
for ev := range st.Watch("/doozer/info/*/applied") {
cl.update(ev)
cl.check()
}
}
func Clean(c chan string, st *store.Store, p consensus.Proposer) {
for addr := range c {
_, g := st.Snap()
name := getName(addr, g)
if name != "" {
go func() {
clearSlot(p, g, name)
removeInfo(p, g, name)
}()
}
}
}
func readdirMap(st *store.Store, path string) map[string]string {
m := map[string]string{}
keys, cas := st.Get(path)
if cas != store.Dir {
return map[string]string{}
}
for _, key := range keys {
v, cas := st.Get(path + "/" + key)
if cas != store.Dir && cas != store.Missing {
m[key] = v[0]
}
}
return m
}
func Clean(st *store.Store, p paxos.Proposer) {
logger := util.NewLogger("member")
for ev := range st.Watch("/session/*") {
if !ev.IsDel() {
continue
}
parts := strings.Split(ev.Path, "/", 3)
name := parts[2]
logger.Printf("lost session %s", name)
clearSlot(p, ev, name)
removeMember(p, ev, name)
removeInfo(p, ev, name)
}
}
func walk(path string, st *store.Store, ch chan store.Event) {
for path != "/" && strings.HasSuffix(path, "/") {
// TODO generalize and factor this into pkg store.
path = path[0 : len(path)-1]
}
v, rev := st.Get(path)
if rev != store.Dir {
ch <- store.Event{0, path, v[0], rev, "", nil, nil}
return
}
if path == "/" {
path = ""
}
for _, ent := range v {
walk(path+"/"+ent, st, ch)
}
}
func activate(st *store.Store, self string, c *client.Client, cal chan int) {
logger := util.NewLogger("activate")
ch := make(chan store.Event)
st.GetDirAndWatch("/doozer/slot", ch)
for ev := range ch {
// TODO ev.IsEmpty()
if ev.IsSet() && ev.Body == "" {
_, err := c.Set(ev.Path, self, ev.Cas)
if err != nil {
logger.Println(err)
continue
}
close(cal)
close(ch)
}
}
}
func sendLearn(out chan<- Packet, p *packet, st *store.Store) {
if p.msg.Cmd != nil && *p.msg.Cmd == msg_INVITE {
ch, err := st.Wait(store.Any, *p.Seqn)
if err == store.ErrTooLate {
log.Println(err)
} else {
e := <-ch
m := msg{
Seqn: &e.Seqn,
Cmd: learn,
Value: []byte(e.Mut),
}
buf, _ := proto.Marshal(&m)
out <- Packet{p.Addr, buf}
}
}
}
func Clean(st *store.Store, pp paxos.Proposer) {
logger := util.NewLogger("lock")
for ev := range st.Watch("/session/*") {
if !ev.IsDel() {
continue
}
parts := strings.Split(ev.Path, "/", 3)
name := parts[2]
logger.Printf("lost session %s", name)
ch, err := store.Walk(ev, "/lock/**")
if err != nil {
continue
}
for ev := range ch {
if ev.Body == name {
paxos.Del(pp, ev.Path, ev.Cas)
}
}
}
}
func generateRuns(rev, alpha int64, st *store.Store, runs chan<- *run, t run) {
for {
ch, err := st.Wait(store.Any, rev)
if err != nil {
panic(err) // can't happen
}
e := <-ch
if closed(ch) {
break
}
rev = e.Seqn + 1
r := t
r.seqn = e.Seqn + alpha
r.cals = getCals(e)
r.addrs = getAddrs(e)
r.c.size = len(r.cals)
r.c.quor = r.quorum()
r.c.crnd = r.indexOf(r.self) + int64(len(r.cals))
r.l.init(int64(r.quorum()))
runs <- &r
}
}
func activate(st *store.Store, self string, c *doozer.Conn) int64 {
rev, _ := st.Snap()
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
}
return seqn
}
}
for {
ch, err := st.Wait(calGlob, rev+1)
if err != nil {
panic(err)
}
ev, ok := <-ch
if !ok {
panic(os.EOF)
}
rev = ev.Rev
// 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
}
return seqn
} else if ev.IsSet() && ev.Body == self {
return ev.Seqn
}
}
return 0
}
func Monitor(self string, st *store.Store, cl SetDeler) os.Error {
mon := &monitor{
self: self,
st: st,
cl: cl,
clock: make(chan ticker),
units: make(map[string]unit),
refs: make(map[string]int),
exitCh: make(chan exit),
readyCh: make(chan ready),
logger: util.NewLogger("monitor"),
}
mon.logger.Println("reading units")
evs := make(chan store.Event)
st.GetDirAndWatch(ctlKey, evs)
go func(c <-chan store.Event) {
for e := range c {
evs <- e
}
close(evs)
}(st.Watch(lockKey + "/*"))
for {
select {
case t := <-mon.clock:
t.tick()
case ev := <-evs:
prefix, id := path.Split(ev.Path)
switch prefix {
case ctlDir:
if ev.IsDel() {
mon.logger.Println("\n\n\ndel", id)
mon.decrefUnit(id)
break
}
ut := mon.increfUnit(id)
if ut == nil {
break
}
switch ev.Body {
case "start":
ut.start()
case "stop":
ut.stop()
case "auto", "":
fallthrough
default:
// nothing
}
case lockDir:
ut := mon.units[id]
if ut == nil {
break
}
ut.dispatchLockEvent(ev)
}
case e := <-mon.exitCh:
e.e.exited(e.w)
case r := <-mon.readyCh:
r.r.ready(r.f)
}
}
panic("unreachable")
}
func Clean(st *store.Store, keep int64, ticker <-chan time.Time) {
for _ = range ticker {
last := (<-st.Seqns) - keep
st.Clean(last)
}
}
