func (c *Config) loadEnv(target interface{}) error {
value := reflect.Indirect(reflect.ValueOf(target))
typ := value.Type()
for i := 0; i < typ.NumField(); i++ {
field := typ.Field(i)
// Retrieve environment variable.
v := strings.TrimSpace(os.Getenv(field.Tag.Get("env")))
if v == "" {
continue
}
// Set the appropriate type.
switch field.Type.Kind() {
case reflect.Bool:
value.Field(i).SetBool(v != "0" && v != "false")
case reflect.Int:
newValue, err := strconv.ParseInt(v, 10, 0)
if err != nil {
return fmt.Errorf("Parse error: %s: %s", field.Tag.Get("env"), err)
}
value.Field(i).SetInt(newValue)
case reflect.String:
value.Field(i).SetString(v)
case reflect.Slice:
value.Field(i).Set(reflect.ValueOf(ustrings.TrimSplit(v, ",")))
}
}
return nil
}
// LoadPeersFile loads the peers listed in the peers file.
func (c *Config) LoadPeersFile() error {
if c.PeersFile == "" {
return nil
}
b, err := ioutil.ReadFile(c.PeersFile)
if err != nil {
return fmt.Errorf("Peers file error: %s", err)
}
c.Peers = ustrings.TrimSplit(string(b), ",")
return nil
}
// Loads configuration from command line flags.
func (c *Config) LoadFlags(arguments []string) error {
var peers, cors, path string
f := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
f.SetOutput(ioutil.Discard)
f.BoolVar(&c.ShowHelp, "h", false, "")
f.BoolVar(&c.ShowHelp, "help", false, "")
f.BoolVar(&c.ShowVersion, "version", false, "")
f.BoolVar(&c.Force, "f", false, "")
f.BoolVar(&c.Force, "force", false, "")
f.BoolVar(&c.Verbose, "v", c.Verbose, "")
f.BoolVar(&c.VeryVerbose, "vv", c.VeryVerbose, "")
f.BoolVar(&c.VeryVeryVerbose, "vvv", c.VeryVeryVerbose, "")
f.StringVar(&peers, "peers", "", "")
f.StringVar(&c.PeersFile, "peers-file", c.PeersFile, "")
f.StringVar(&c.Name, "name", c.Name, "")
f.StringVar(&c.Addr, "addr", c.Addr, "")
f.StringVar(&c.Discovery, "discovery", c.Discovery, "")
f.StringVar(&c.BindAddr, "bind-addr", c.BindAddr, "")
f.StringVar(&c.Peer.Addr, "peer-addr", c.Peer.Addr, "")
f.StringVar(&c.Peer.BindAddr, "peer-bind-addr", c.Peer.BindAddr, "")
f.StringVar(&c.CAFile, "ca-file", c.CAFile, "")
f.StringVar(&c.CertFile, "cert-file", c.CertFile, "")
f.StringVar(&c.KeyFile, "key-file", c.KeyFile, "")
f.StringVar(&c.Peer.CAFile, "peer-ca-file", c.Peer.CAFile, "")
f.StringVar(&c.Peer.CertFile, "peer-cert-file", c.Peer.CertFile, "")
f.StringVar(&c.Peer.KeyFile, "peer-key-file", c.Peer.KeyFile, "")
f.StringVar(&c.DataDir, "data-dir", c.DataDir, "")
f.IntVar(&c.MaxResultBuffer, "max-result-buffer", c.MaxResultBuffer, "")
f.IntVar(&c.MaxRetryAttempts, "max-retry-attempts", c.MaxRetryAttempts, "")
f.Float64Var(&c.RetryInterval, "retry-interval", c.RetryInterval, "")
f.IntVar(&c.Peer.HeartbeatInterval, "peer-heartbeat-interval", c.Peer.HeartbeatInterval, "")
f.IntVar(&c.Peer.ElectionTimeout, "peer-election-timeout", c.Peer.ElectionTimeout, "")
f.StringVar(&cors, "cors", "", "")
f.BoolVar(&c.Snapshot, "snapshot", c.Snapshot, "")
f.IntVar(&c.SnapshotCount, "snapshot-count", c.SnapshotCount, "")
f.StringVar(&c.CPUProfileFile, "cpuprofile", "", "")
f.StringVar(&c.strTrace, "trace", "", "")
f.StringVar(&c.GraphiteHost, "graphite-host", "", "")
// BEGIN IGNORED FLAGS
f.StringVar(&path, "config", "", "")
// BEGIN IGNORED FLAGS
// BEGIN DEPRECATED FLAGS
f.StringVar(&peers, "C", "", "(deprecated)")
f.StringVar(&c.PeersFile, "CF", c.PeersFile, "(deprecated)")
f.StringVar(&c.Name, "n", c.Name, "(deprecated)")
f.StringVar(&c.Addr, "c", c.Addr, "(deprecated)")
f.StringVar(&c.BindAddr, "cl", c.BindAddr, "(deprecated)")
f.StringVar(&c.Peer.Addr, "s", c.Peer.Addr, "(deprecated)")
f.StringVar(&c.Peer.BindAddr, "sl", c.Peer.BindAddr, "(deprecated)")
f.StringVar(&c.Peer.CAFile, "serverCAFile", c.Peer.CAFile, "(deprecated)")
f.StringVar(&c.Peer.CertFile, "serverCert", c.Peer.CertFile, "(deprecated)")
f.StringVar(&c.Peer.KeyFile, "serverKey", c.Peer.KeyFile, "(deprecated)")
f.StringVar(&c.CAFile, "clientCAFile", c.CAFile, "(deprecated)")
f.StringVar(&c.CertFile, "clientCert", c.CertFile, "(deprecated)")
f.StringVar(&c.KeyFile, "clientKey", c.KeyFile, "(deprecated)")
f.StringVar(&c.DataDir, "d", c.DataDir, "(deprecated)")
f.IntVar(&c.MaxResultBuffer, "m", c.MaxResultBuffer, "(deprecated)")
f.IntVar(&c.MaxRetryAttempts, "r", c.MaxRetryAttempts, "(deprecated)")
f.IntVar(&c.SnapshotCount, "snapshotCount", c.SnapshotCount, "(deprecated)")
f.IntVar(&c.Peer.HeartbeatInterval, "peer-heartbeat-timeout", c.Peer.HeartbeatInterval, "(deprecated)")
// END DEPRECATED FLAGS
if err := f.Parse(arguments); err != nil {
return err
}
// Print deprecation warnings on STDERR.
f.Visit(func(f *flag.Flag) {
if len(newFlagNameLookup[f.Name]) > 0 {
fmt.Fprintf(os.Stderr, "[deprecated] use -%s, not -%s\n", newFlagNameLookup[f.Name], f.Name)
}
})
// Convert some parameters to lists.
if peers != "" {
c.Peers = ustrings.TrimSplit(peers, ",")
}
if cors != "" {
c.CorsOrigins = ustrings.TrimSplit(cors, ",")
}
return nil
}