func putKV(client *api.Client, key, value string, index uint64) (bool, error) {
p := &api.KVPair{Key: key[1:], Value: []byte(value), ModifyIndex: index}
ok, _, err := client.KV().CAS(p, nil)
if err != nil {
return false, err
}
return ok, nil
}
func getKV(client *api.Client, key string, waitIndex uint64) (string, uint64, error) {
q := &api.QueryOptions{RequireConsistent: true, WaitIndex: waitIndex}
kvpair, meta, err := client.KV().Get(key, q)
if err != nil {
return "", 0, err
}
if kvpair == nil {
return "", meta.LastIndex, nil
}
return strings.TrimSpace(string(kvpair.Value)), meta.LastIndex, nil
}
func nextValue(client *api.Client, path string, lastIndex uint64) (string, uint64) {
for {
q := &api.QueryOptions{RequireConsistent: true, WaitIndex: lastIndex}
kvpair, meta, err := client.KV().Get(path, q)
if err != nil {
log.Printf("[WARN] Error fetching config from %s. %v", path, err)
time.Sleep(time.Second)
continue
}
if kvpair == nil {
return "", meta.LastIndex
}
return strings.TrimSpace(string(kvpair.Value)), meta.LastIndex
}
}