func (c *CfgMetaKv) SetKey(key string, val []byte) (
uint64, error) {
rev, err := c.cfgMem.GetRev(key, 0)
if err != nil {
return 0, err
}
if rev == nil {
err = metakv.Add(c.makeKey(key), val)
} else {
err = metakv.Set(c.makeKey(key), val, rev)
}
if err == nil {
cas, err = c.cfgMem.Set(key, val, CAS_FORCE)
if err != nil {
return 0, err
}
}
}
func (c *CfgMetaKv) Set(key string, val []byte, cas uint64) (
uint64, error) {
log.Printf("cfg_metakv: Set, key: %v, cas: %x", key, cas)
path := c.keyToPath(key)
c.m.Lock()
defer c.m.Unlock()
if cfgMetaKvSplitKeys[key] {
curEntry := c.splitEntries[key]
if cas != 0 && cas != curEntry.cas {
return 0, &CfgCASError{}
}
var curNodeDefs NodeDefs
if curEntry.data != nil && len(curEntry.data) > 0 {
err := json.Unmarshal(curEntry.data, &curNodeDefs)
if err != nil {
return 0, err
}
}
var nd NodeDefs
err := json.Unmarshal(val, &nd)
if err != nil {
return 0, err
}
// Analyze which children were added, removed, updated.
//
added := map[string]bool{}
removed := map[string]bool{}
updated := map[string]bool{}
for k, v := range nd.NodeDefs {
if curNodeDefs.NodeDefs == nil ||
curNodeDefs.NodeDefs[k] == nil {
added[k] = true
} else {
if curNodeDefs.NodeDefs[k].UUID != v.UUID {
updated[k] = true
}
}
}
if curNodeDefs.NodeDefs != nil {
for k, _ := range curNodeDefs.NodeDefs {
if nd.NodeDefs[k] == nil {
removed[k] = true
}
}
}
// Update metakv with child entries.
//
if len(added) > 0 || len(updated) > 0 {
for k, v := range nd.NodeDefs {
childNodeDefs := NodeDefs{
UUID: nd.UUID,
NodeDefs: map[string]*NodeDef{},
ImplVersion: nd.ImplVersion,
}
childNodeDefs.NodeDefs[k] = v
val, err = json.Marshal(childNodeDefs)
if err != nil {
return 0, err
}
childPath := path + "/" + k
log.Printf("cfg_metakv: Set split key: %v, childPath: %v",
key, childPath)
err = metakv.Set(childPath, val, nil)
if err != nil {
return 0, err
}
}
}
// Remove composite children entries from metakv only if
// caller was attempting removals only. This should work as
// the caller usually has read-modify-write logic that only
// removes node defs and does not add/update node defs in the
// same read-modify-write code path.
//
if len(added) <= 0 && len(updated) <= 0 && len(removed) > 0 {
for nodeDefUUID := range removed {
err = metakv.Delete(path+"/"+nodeDefUUID, nil)
if err != nil {
return 0, err
}
}
}
casResult := c.lastSplitCAS + 1
c.lastSplitCAS = casResult
return casResult, err
}
rev, err := c.cfgMem.GetRev(key, cas)
if err != nil {
return 0, err
}
if rev == nil {
err = metakv.Add(path, val)
} else {
err = metakv.Set(path, val, rev)
}
if err != nil {
return 0, err
}
return c.cfgMem.Set(key, val, CFG_CAS_FORCE)
}