// get() retrieves multiple child entries from the metakv and weaves
// the results back into a composite nodeDefs. get() must be invoked
// with c.m.Lock()'ed.
func (a *cfgMetaKvNodeDefsSplitHandler) get(
c *CfgMetaKv, key string, cas uint64) ([]byte, uint64, error) {
m, err := metakv.ListAllChildren(c.keyToPath(key) + "/")
if err != nil {
return nil, 0, err
}
rv := &NodeDefs{NodeDefs: make(map[string]*NodeDef)}
uuids := []string{}
for _, v := range m {
var childNodeDefs NodeDefs
err = json.Unmarshal(v.Value, &childNodeDefs)
if err != nil {
return nil, 0, err
}
for k1, v1 := range childNodeDefs.NodeDefs {
rv.NodeDefs[k1] = v1
}
if rv.ImplVersion == "" ||
VersionGTE(childNodeDefs.ImplVersion, rv.ImplVersion) {
rv.ImplVersion = childNodeDefs.ImplVersion
}
uuids = append(uuids, childNodeDefs.UUID)
}
rv.UUID = checkSumUUIDs(uuids)
if rv.ImplVersion == "" {
rv.ImplVersion = VERSION
}
data, err := json.Marshal(rv)
if err != nil {
return nil, 0, err
}
casResult := c.lastSplitCAS + 1
c.lastSplitCAS = casResult
c.splitEntries[key] = CfgMetaKvEntry{
cas: casResult,
data: data,
}
return data, casResult, nil
}
// for testing
func (c *CfgMetaKv) listChildPaths(key string) ([]string, error) {
g := []string{}
if cfgMetaKvAdvancedKeys[key] != nil {
m, err := metakv.ListAllChildren(c.keyToPath(key) + "/")
if err != nil {
return nil, err
}
for _, v := range m {
g = append(g, v.Path)
}
}
return g, nil
}