func NewSentinel(id string, cfg *config, stop chan bool, end chan bool) (*Sentinel, error) {
var initialClusterSpec *cluster.ClusterSpec
if cfg.initialClusterSpecFile != "" {
configData, err := ioutil.ReadFile(cfg.initialClusterSpecFile)
if err != nil {
return nil, fmt.Errorf("cannot read provided initial cluster config file: %v", err)
}
if err := json.Unmarshal(configData, &initialClusterSpec); err != nil {
return nil, fmt.Errorf("cannot parse provided initial cluster config: %v", err)
}
initialClusterSpec.SetDefaults()
log.Debug("initialClusterSpec dump", zap.String("initialClusterSpec", spew.Sdump(initialClusterSpec)))
if err := initialClusterSpec.Validate(); err != nil {
return nil, fmt.Errorf("invalid initial cluster: %v", err)
}
}
storePath := filepath.Join(common.StoreBasePath, cfg.clusterName)
kvstore, err := store.NewStore(store.Backend(cfg.storeBackend), cfg.storeEndpoints)
if err != nil {
return nil, fmt.Errorf("cannot create store: %v", err)
}
e := store.NewStoreManager(kvstore, storePath)
candidate := leadership.NewCandidate(kvstore, filepath.Join(storePath, common.SentinelLeaderKey), id, store.MinTTL)
return &Sentinel{
id: id,
cfg: cfg,
e: e,
candidate: candidate,
leader: false,
initialClusterSpec: initialClusterSpec,
stop: stop,
end: end,
UIDFn: common.UID,
// This is just to choose a pseudo random keeper so
// use math.rand (no need for crypto.rand) without an
// initial seed.
RandFn: rand.Intn,
sleepInterval: cluster.DefaultSleepInterval,
requestTimeout: cluster.DefaultRequestTimeout,
}, nil
}
func initCluster(cmd *cobra.Command, args []string) {
if len(args) > 1 {
die("too many arguments")
}
data := []byte{}
switch len(args) {
case 1:
data = []byte(args[0])
case 0:
if initOpts.file != "" {
var err error
if initOpts.file == "-" {
data, err = ioutil.ReadAll(os.Stdin)
if err != nil {
die("cannot read from stdin: %v", err)
}
} else {
data, err = ioutil.ReadFile(initOpts.file)
if err != nil {
die("cannot read file: %v", err)
}
}
}
}
storePath := filepath.Join(common.StoreBasePath, cfg.clusterName)
kvstore, err := store.NewStore(store.Backend(cfg.storeBackend), cfg.storeEndpoints)
if err != nil {
die("cannot create store: %v", err)
}
e := store.NewStoreManager(kvstore, storePath)
cd, _, err := e.GetClusterData()
if err != nil {
die("cannot get cluster data: %v", err)
}
if cd != nil {
stdout("WARNING: The current cluster data will be removed")
}
stdout("WARNING: The databases managed by the keepers will be overwrited depending on the provided cluster spec.")
accepted := true
if !initOpts.forceYes {
accepted, err = askConfirmation("Are you sure you want to continue? [yes/no] ")
if err != nil {
die("%v", err)
}
}
if !accepted {
stdout("exiting")
os.Exit(0)
}
cd, _, err = e.GetClusterData()
if err != nil {
die("cannot get cluster data: %v", err)
}
var cs *cluster.ClusterSpec
if len(data) == 0 {
// Define a new cluster spec with initMode "new"
cs = &cluster.ClusterSpec{}
cs.InitMode = cluster.ClusterInitModeNew
} else {
if err := json.Unmarshal(data, &cs); err != nil {
die("failed to unmarshal cluster spec: %v", err)
}
}
cs.SetDefaults()
if err := cs.Validate(); err != nil {
die("invalid cluster spec: %v", err)
}
c := cluster.NewCluster(common.UID(), cs)
cd = cluster.NewClusterData(c)
// We ignore if cd has been modified between reading and writing
if err := e.PutClusterData(cd); err != nil {
die("cannot update cluster data: %v", err)
}
}
func update(cmd *cobra.Command, args []string) {
if len(args) > 1 {
die("too many arguments")
}
if updateOpts.file == "" && len(args) < 1 {
die("no cluster spec provided as argument and no file provided (--file/-f option)")
}
if updateOpts.file != "" && len(args) == 1 {
die("only one of cluster spec provided as argument or file must provided (--file/-f option)")
}
data := []byte{}
if len(args) == 1 {
data = []byte(args[0])
} else {
var err error
if updateOpts.file == "-" {
data, err = ioutil.ReadAll(os.Stdin)
if err != nil {
die("cannot read from stdin: %v", err)
}
} else {
data, err = ioutil.ReadFile(updateOpts.file)
if err != nil {
die("cannot read file: %v", err)
}
}
}
storePath := filepath.Join(common.StoreBasePath, cfg.clusterName)
kvstore, err := store.NewStore(store.Backend(cfg.storeBackend), cfg.storeEndpoints)
if err != nil {
die("cannot create store: %v", err)
}
e := store.NewStoreManager(kvstore, storePath)
retry := 0
for retry < maxRetries {
cd, pair, err := getClusterData(e)
if err != nil {
die("%v", err)
}
if cd.Cluster == nil {
die("no cluster spec available")
}
if cd.Cluster.Spec == nil {
die("no cluster spec available")
}
var newcs *cluster.ClusterSpec
if updateOpts.patch {
newcs, err = patchClusterSpec(cd.Cluster.Spec, data)
if err != nil {
die("failed to patch cluster spec: %v", err)
}
} else {
if err := json.Unmarshal(data, &newcs); err != nil {
die("failed to unmarshal cluster spec: %v", err)
}
}
newcs.SetDefaults()
if err := cd.Cluster.UpdateSpec(newcs); err != nil {
die("Cannot update cluster spec: %v", err)
}
// retry if cd has been modified between reading and writing
_, err = e.AtomicPutClusterData(cd, pair)
if err != nil {
if err == libkvstore.ErrKeyModified {
retry++
continue
}
die("cannot update cluster data: %v", err)
}
break
}
if retry == maxRetries {
die("failed to update cluster data after %d retries", maxRetries)
}
}