func addLockDirChild(client *etcd.Client, key string) (*etcd.Response, error) {
hostname, err := os.Hostname()
if err != nil {
return nil, errgo.Notef(err, "fail to get hostname")
}
client.SyncCluster()
return client.AddChild(key, hostname, 0)
}
// newEtcdBackend constructs a etcd backend using a given machine address.
func newEtcdBackend(conf map[string]string) (Backend, error) {
// Get the etcd path form the configuration.
path, ok := conf["path"]
if !ok {
path = "/vault"
}
// Ensure path is prefixed.
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
// Set a default machines list and check for an overriding address value.
machines := "http://128.0.0.1:2379"
if address, ok := conf["address"]; ok {
machines = address
}
machinesParsed := strings.Split(machines, EtcdMachineDelimiter)
// Create a new client from the supplied address and attempt to sync with the
// cluster.
var client *etcd.Client
cert, has_cert := conf["tls_cert_file"]
key, has_key := conf["tls_key_file"]
ca, has_ca := conf["tls_ca_file"]
if has_cert || has_key || has_ca {
var err error
client, err = etcd.NewTLSClient(machinesParsed, cert, key, ca)
if err != nil {
return nil, err
}
} else {
client = etcd.NewClient(machinesParsed)
}
if !client.SyncCluster() {
return nil, EtcdSyncClusterError
}
// Setup the backend.
return &EtcdBackend{
path: path,
client: client,
}, nil
}
func newEtcdClient(etcdServer string) (*etcd.Client, error) {
var (
client *etcd.Client
err error
)
for attempt := 1; attempt <= maxConnectAttempts; attempt++ {
if _, err = etcdutil.GetEtcdVersion(etcdServer); err == nil {
break
}
if attempt == maxConnectAttempts {
break
}
glog.Infof("[Attempt: %d] Attempting access to etcd after 5 second sleep", attempt)
time.Sleep(5 * time.Second)
}
if err != nil {
return nil, fmt.Errorf("failed to connect to etcd server: %v, error: %v", etcdServer, err)
}
glog.Infof("Etcd server found: %v", etcdServer)
// loop until we have > 0 machines && machines[0] != ""
poll, timeout := 1*time.Second, 10*time.Second
if err := wait.Poll(poll, timeout, func() (bool, error) {
if client = etcd.NewClient([]string{etcdServer}); client == nil {
return false, fmt.Errorf("etcd.NewClient returned nil")
}
client.SyncCluster()
machines := client.GetCluster()
if len(machines) == 0 || len(machines[0]) == 0 {
return false, nil
}
return true, nil
}); err != nil {
return nil, fmt.Errorf("Timed out after %s waiting for at least 1 synchronized etcd server in the cluster. Error: %v", timeout, err)
}
return client, nil
}
func main() {
_, err := flags.ParseArgs(&Options, os.Args[1:])
if err != nil {
os.Exit(1)
}
if Options.Debug {
log_debug = true
debugMsg("Debug mode enabled")
}
// Create an ETCD client
var e *etcd.Client
if Options.Cert != "" && Options.Key != "" {
debugMsg("Connecting using TLS: ", Options.EtcdHosts, Options.Cert, Options.Key, Options.CaCert)
e, err = etcd.NewTLSClient(Options.EtcdHosts, Options.Cert, Options.Key, Options.CaCert)
if err != nil {
logger.Fatalf("Failed to connect to Etcd server using TLS: ", err)
}
} else {
e = etcd.NewClient(Options.EtcdHosts)
}
if !e.SyncCluster() {
logger.Printf("[WARNING] Failed to connect to etcd cluster at launch time")
}
// Register the metrics writer
if len(Options.GraphiteServer) > 0 {
addr, err := net.ResolveTCPAddr("tcp", Options.GraphiteServer)
if err != nil {
logger.Fatalf("Failed to parse graphite server: ", err)
}
prefix := "discodns"
hostname, err := os.Hostname()
if err != nil {
logger.Fatalf("Unable to get hostname: ", err)
}
prefix = prefix + "." + strings.Replace(hostname, ".", "_", -1)
go metrics.Graphite(metrics.DefaultRegistry, time.Duration(Options.GraphiteDuration)*time.Second, prefix, addr)
} else if Options.MetricsDuration > 0 {
go metrics.Log(metrics.DefaultRegistry, time.Duration(Options.MetricsDuration)*time.Second, logger)
// Register a bunch of debug metrics
metrics.RegisterDebugGCStats(metrics.DefaultRegistry)
metrics.RegisterRuntimeMemStats(metrics.DefaultRegistry)
go metrics.CaptureDebugGCStats(metrics.DefaultRegistry, time.Duration(Options.MetricsDuration))
go metrics.CaptureRuntimeMemStats(metrics.DefaultRegistry, time.Duration(Options.MetricsDuration))
} else {
logger.Printf("Metric logging disabled")
}
// Start up the DNS resolver server
server := &Server{
addr: Options.ListenAddress,
port: Options.ListenPort,
etcd: e,
prefix: Options.Prefix,
rTimeout: time.Duration(5) * time.Second,
wTimeout: time.Duration(5) * time.Second,
defaultTtl: Options.DefaultTtl,
queryFilterer: &QueryFilterer{acceptFilters: parseFilters(Options.Accept),
rejectFilters: parseFilters(Options.Reject)}}
server.Run()
logger.Printf("Listening on %s:%d\n", Options.ListenAddress, Options.ListenPort)
sig := make(chan os.Signal)
signal.Notify(sig, os.Interrupt)
forever:
for {
select {
case <-sig:
logger.Printf("Bye bye :(\n")
break forever
}
}
}
func main() {
var (
nodes string
taskList string
tasks []string
confPath string
confData *lib.RunConfig
cliVars string
cliData map[string]interface{}
verbose bool
taskDir string
tmplDir string
etcdClient *etcd.Client
base *cobra.Command
err error
)
base = &cobra.Command{
Use: "atom",
Short: "atom",
Long: "atom",
Run: func(cmd *cobra.Command, args []string) {
confData, err = lib.ParseAtomConfig(confPath)
if err != nil {
log.Printf("Config read error: %s", err)
if (taskDir == "") || (tmplDir == "") {
return
} else {
confData = &lib.RunConfig{
TaskDir: taskDir,
TmplDir: tmplDir,
Verbose: verbose,
}
}
}
if err := yaml.Unmarshal([]byte(cliVars), &cliData); err != nil {
log.Printf("Error: %s", err)
}
if nodes == "" {
etcdClient = nil
} else {
etcdClient = etcd.NewClient([]string{nodes})
etcdClient.SetDialTimeout(time.Duration(3) * time.Second)
if !etcdClient.SyncCluster() {
log.Fatal("Couldn't sync with etcd cluster.")
}
etcdClient.SetConsistency(etcd.STRONG_CONSISTENCY)
}
for _, name := range strings.Split(taskList, ",") {
if name == "" {
continue
}
tasks = append(tasks, name)
}
if len(tasks) <= 0 {
tasks = nil
}
atom := lib.NewAtom(confData, &cliData, etcdClient)
atom.Run(tasks...)
},
}
base.Flags().StringVarP(&taskList, "run", "r", "", "tasks to run")
base.PersistentFlags().StringVarP(&cliVars, "data", "d", "", "cli data (string, yaml)")
base.PersistentFlags().StringVarP(&confPath, "conf", "c", "/etc/atom/atom.yml", "atom.yml")
base.PersistentFlags().StringVarP(&nodes, "nodes", "n", "", "etcd nodes")
base.PersistentFlags().StringVarP(&taskDir, "task", "t", "", "task directory")
base.PersistentFlags().StringVarP(&tmplDir, "template", "m", "", "template directory")
base.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose")
base.Execute()
}
