func NewTokenMapStream() *TokenMapStream {
cancel := make(chan struct{})
ch := make(chan *TokenMap)
cb := func(path string, value []byte, rev interface{}) error {
if path != TokensKey {
return nil
}
tokens := &TokenMap{}
err := json.Unmarshal(value, tokens)
if err != nil {
log.Fatalf("Failed to unmarshal token map: %s\n%s",
err.Error(), string(value))
}
select {
case ch <- tokens:
case <-cancel:
}
return nil
}
go metakv.RunObserveChildren(ServiceDir, cb, cancel)
return &TokenMapStream{
C: ch,
cancel: cancel,
}
}
// NewCfgMetaKv returns a CfgMetaKv that reads and stores its single
// configuration file in the metakv.
func NewCfgMetaKv(nodeUUID string) (*CfgMetaKv, error) {
cfg := &CfgMetaKv{
prefix: CfgMetaKvPrefix,
nodeUUID: nodeUUID,
cfgMem: NewCfgMem(),
cancelCh: make(chan struct{}),
splitEntries: map[string]CfgMetaKvEntry{},
}
backoffStartSleepMS := 200
backoffFactor := float32(1.5)
backoffMaxSleepMS := 5000
go ExponentialBackoffLoop("cfg_metakv.RunObserveChildren",
func() int {
err := metakv.RunObserveChildren(cfg.prefix, cfg.metaKVCallback,
cfg.cancelCh)
if err == nil {
return -1 // Success, so stop the loop.
}
log.Printf("cfg_metakv: RunObserveChildren, err: %v", err)
return 0 // No progress, so exponential backoff.
},
backoffStartSleepMS, backoffFactor, backoffMaxSleepMS)
return cfg, nil
}
// NewCfgMetaKv returns a CfgMetaKv that reads and stores its single
// configuration file in the metakv.
func NewCfgMetaKv() (*CfgMetaKv, error) {
cfg := &CfgMetaKv{
path: BASE_CFG_PATH,
cancelCh: make(chan struct{}),
cfgMem: NewCfgMem(),
uuid: NewUUID(),
}
go func() {
for {
err := metakv.RunObserveChildren(cfg.path, cfg.metaKVCallback,
cfg.cancelCh)
if err == nil {
return
} else {
log.Printf("metakv notifier failed (%v)", err)
}
}
}()
return cfg, nil
}
func NewSettingsManager(supvCmdch MsgChannel,
supvMsgch MsgChannel, config common.Config) (settingsManager, common.Config, Message) {
s := settingsManager{
supvCmdch: supvCmdch,
supvMsgch: supvMsgch,
config: config,
cancelCh: make(chan struct{}),
}
config, err := common.GetSettingsConfig(config)
if err != nil {
return s, nil, &MsgError{
err: Error{
category: INDEXER,
cause: err,
severity: FATAL,
}}
}
ncpu := common.SetNumCPUs(config["indexer.settings.max_cpu_percent"].Int())
logging.Infof("Setting maxcpus = %d", ncpu)
setBlockPoolSize(nil, config)
setLogger(config)
http.HandleFunc("/settings", s.handleSettingsReq)
http.HandleFunc("/triggerCompaction", s.handleCompactionTrigger)
go func() {
for {
err := metakv.RunObserveChildren("/", s.metaKVCallback, s.cancelCh)
if err == nil {
return
} else {
logging.Errorf("IndexerSettingsManager: metakv notifier failed (%v)..Restarting", err)
}
}
}()
indexerConfig := config.SectionConfig("indexer.", true)
return s, indexerConfig, &MsgSuccess{}
}
func SetupSettingsNotifier(callb func(Config), cancelCh chan struct{}) {
metaKvCb := func(path string, val []byte, rev interface{}) error {
if path == IndexingSettingsMetaPath {
logging.Infof("New settings received: \n%s", string(val))
config := SystemConfig.FilterConfig(".settings.")
config.Update(val)
callb(config)
}
return nil
}
go func() {
for {
err := metakv.RunObserveChildren(IndexingSettingsMetaDir, metaKvCb, cancelCh)
if err == nil {
return
} else {
logging.Errorf("Settings metakv notifier failed (%v)..Restarting", err)
}
}
}()
return
}
