// ForceRead reads configuration from given file name or bails out if it fails
func ForceRead(file_name string) *Configuration {
_, err := read(file_name)
if err != nil {
log.Fatal("Cannot read config file:", file_name, err)
}
return Config
}
// read reads configuration from given file, or silently skips if the file does not exist.
// If the file does exist, then it is expected to be in valid JSON format or the function bails out.
func read(file_name string) (*Configuration, error) {
file, err := os.Open(file_name)
if err == nil {
decoder := json.NewDecoder(file)
err := decoder.Decode(Config)
if err == nil {
log.Infof("Read config: %s", file_name)
} else {
log.Fatal("Cannot read config file:", file_name, err)
}
}
return Config, err
}
// Cli initiates a command line interface, executing requested command.
func Cli(command string, instance string, sibling string, owner string, reason string) {
instanceKey, err := inst.ParseInstanceKey(instance)
if err != nil {
instanceKey = nil
}
siblingKey, err := inst.ParseInstanceKey(sibling)
if err != nil {
siblingKey = nil
}
if len(owner) == 0 {
// get os username as owner
usr, err := user.Current()
if err != nil {
log.Fatale(err)
}
owner = usr.Username
}
if len(command) == 0 {
log.Fatal("expected command (-c) (discover|forget|continuous|move-up|move-below|begin-maintenance|end-maintenance|clusters|topology|resolve)")
}
switch command {
case "move-up":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
_, err := inst.MoveUp(instanceKey)
if err != nil {
log.Errore(err)
}
}
case "move-below":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if siblingKey == nil {
log.Fatal("Cannot deduce sibling:", sibling)
}
_, err := inst.MoveBelow(instanceKey, siblingKey)
if err != nil {
log.Errore(err)
}
}
case "discover":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
orchestrator.StartDiscovery(*instanceKey)
}
case "forget":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
inst.ForgetInstance(instanceKey)
}
case "begin-maintenance":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if owner == "" {
log.Fatal("--owner option required")
}
if reason == "" {
log.Fatal("--reason option required")
}
maintenanceKey, err := inst.BeginMaintenance(instanceKey, owner, reason)
if err == nil {
log.Infof("Maintenance key: %+v", maintenanceKey)
}
if err != nil {
log.Errore(err)
}
}
case "end-maintenance":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
err := inst.EndMaintenanceByInstanceKey(instanceKey)
if err != nil {
log.Errore(err)
}
}
case "clusters":
{
clusters, err := inst.ReadClusters()
if err != nil {
log.Errore(err)
} else {
fmt.Println(strings.Join(clusters, "\n"))
}
}
case "topology":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
output, err := inst.AsciiTopology(instance)
if err != nil {
log.Errore(err)
} else {
fmt.Println(output)
}
}
case "continuous":
{
orchestrator.ContinuousDiscovery()
}
case "resolve":
{
if instanceKey == nil {
log.Fatal("Cannot deduce instance:", instance)
}
if conn, err := net.Dial("tcp", instanceKey.DisplayString()); err == nil {
conn.Close()
} else {
log.Fatale(err)
}
fmt.Println(instanceKey.DisplayString())
}
default:
log.Fatal("Unknown command:", command)
}
}