func (t *txn) set() {
if !t.c.waccess {
t.respondOsError(syscall.EACCES)
return
}
if !t.c.canWrite {
t.respondErrCode(response_READONLY)
return
}
if t.req.Path == nil || t.req.Rev == nil {
t.respondErrCode(response_MISSING_ARG)
return
}
go func() {
ev := consensus.Set(t.c.p, *t.req.Path, t.req.Value, *t.req.Rev)
if ev.Err != nil {
t.respondOsError(ev.Err)
return
}
t.resp.Rev = &ev.Seqn
t.respond()
}()
}
func clearSlot(p consensus.Proposer, g store.Getter, name string) {
store.Walk(g, calGlob, func(path, body string, rev int64) bool {
if body == name {
consensus.Set(p, path, nil, rev)
}
return false
})
}
func Pulse(node string, seqns <-chan int64, p consensus.Proposer, sleep int64) {
path := "/ctl/node/" + node + "/applied"
for {
seqn, ok := <-seqns
if !ok {
break
}
e := consensus.Set(p, path, []byte(strconv.FormatInt(seqn, 10)), store.Clobber)
if e.Err != nil {
log.Println(e.Err)
}
time.Sleep(time.Duration(sleep))
}
}
func serve(nc net.Conn, st *store.Store, p consensus.Proposer, w bool, rwsk, rosk string, self string) {
client_addr := strings.Replace(nc.RemoteAddr().String(), ":", "-", 1)
eph_node := "/ctl/node/" + self + "/client/" + client_addr
c := &conn{
c: nc,
addr: nc.RemoteAddr().String(),
eph_node: eph_node,
st: st,
p: p,
canWrite: w,
rwsk: rwsk,
rosk: rosk,
self: self,
}
// create the ephemeral node on client connect under this
// node's tree. the list of all clients connected can be
// determined by globbing /ctl/node/*/client/*. to set
// arbitrary value in the ephemeral node for that client,
// simply call SET('/eph', value), where /eph is a symlink to
// that client's ephemeral node.
log.Println("** setting ephemeral node", eph_node)
ev := consensus.Set(p, eph_node, []byte(""), store.Missing)
if ev.Err != nil {
log.Println("** failed to set ephemeral node:", ev.Err)
nc.Close()
return
}
c.grant("") // start as if the client supplied a blank password
c.serve()
// delete the ephemeral node on disconnect
log.Println("** deleting ephemeral node", eph_node)
ev = consensus.Del(p, eph_node, store.Clobber)
if ev.Err != nil {
log.Println("** failed to delete ephemeral node:", ev.Err)
}
nc.Close()
}