// ParseFlags is a helper function for parsing command line flags using Go's
// Flag library. This is extracted into a helper to keep the main function
// small, but it also makes writing tests for parsing command line arguments
// much easier and cleaner.
func (cli *CLI) ParseFlags(args []string) (*config.Config, bool, bool, bool, error) {
var dry, once, version bool
c := config.DefaultConfig()
// configPaths stores the list of configuration paths on disk
configPaths := make([]string, 0, 6)
// Parse the flags and options
flags := flag.NewFlagSet(Name, flag.ContinueOnError)
flags.SetOutput(cli.errStream)
flags.Usage = func() { fmt.Fprintf(cli.errStream, usage, Name) }
flags.Var((funcVar)(func(s string) error {
configPaths = append(configPaths, s)
return nil
}), "config", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.Address = config.String(s)
return nil
}), "consul-addr", "")
flags.Var((funcVar)(func(s string) error {
a, err := config.ParseAuthConfig(s)
if err != nil {
return err
}
c.Consul.Auth = a
return nil
}), "consul-auth", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Consul.Retry.Enabled = config.Bool(b)
return nil
}), "consul-retry", "")
flags.Var((funcIntVar)(func(i int) error {
c.Consul.Retry.Attempts = config.Int(i)
return nil
}), "consul-retry-attempts", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.Consul.Retry.Backoff = config.TimeDuration(d)
return nil
}), "consul-retry-backoff", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Consul.SSL.Enabled = config.Bool(b)
return nil
}), "consul-ssl", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.SSL.CaCert = config.String(s)
return nil
}), "consul-ssl-ca-cert", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.SSL.CaPath = config.String(s)
return nil
}), "consul-ssl-ca-path", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.SSL.Cert = config.String(s)
return nil
}), "consul-ssl-cert", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.SSL.Key = config.String(s)
return nil
}), "consul-ssl-key", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.SSL.ServerName = config.String(s)
return nil
}), "consul-ssl-server-name", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Consul.SSL.Verify = config.Bool(b)
return nil
}), "consul-ssl-verify", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Dedup.Enabled = config.Bool(b)
return nil
}), "dedup", "")
flags.BoolVar(&dry, "dry", false, "")
flags.Var((funcVar)(func(s string) error {
c.Exec.Enabled = config.Bool(true)
c.Exec.Command = config.String(s)
return nil
}), "exec", "")
flags.Var((funcVar)(func(s string) error {
sig, err := signals.Parse(s)
if err != nil {
return err
}
c.Exec.KillSignal = config.Signal(sig)
return nil
}), "exec-kill-signal", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.Exec.KillTimeout = config.TimeDuration(d)
return nil
}), "exec-kill-timeout", "")
flags.Var((funcVar)(func(s string) error {
sig, err := signals.Parse(s)
if err != nil {
return err
}
c.Exec.ReloadSignal = config.Signal(sig)
return nil
}), "exec-reload-signal", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.Exec.Splay = config.TimeDuration(d)
return nil
}), "exec-splay", "")
flags.Var((funcVar)(func(s string) error {
sig, err := signals.Parse(s)
if err != nil {
return err
}
c.KillSignal = config.Signal(sig)
return nil
}), "kill-signal", "")
flags.Var((funcVar)(func(s string) error {
c.LogLevel = config.String(s)
return nil
}), "log-level", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.MaxStale = config.TimeDuration(d)
return nil
}), "max-stale", "")
flags.BoolVar(&once, "once", false, "")
flags.Var((funcVar)(func(s string) error {
c.PidFile = config.String(s)
return nil
}), "pid-file", "")
flags.Var((funcVar)(func(s string) error {
sig, err := signals.Parse(s)
if err != nil {
return err
}
c.ReloadSignal = config.Signal(sig)
return nil
}), "reload-signal", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.Consul.Retry.Backoff = config.TimeDuration(d)
return nil
}), "retry", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Syslog.Enabled = config.Bool(b)
return nil
}), "syslog", "")
flags.Var((funcVar)(func(s string) error {
c.Syslog.Facility = config.String(s)
return nil
}), "syslog-facility", "")
flags.Var((funcVar)(func(s string) error {
t, err := config.ParseTemplateConfig(s)
if err != nil {
return err
}
*c.Templates = append(*c.Templates, t)
return nil
}), "template", "")
flags.Var((funcVar)(func(s string) error {
c.Consul.Token = config.String(s)
return nil
}), "token", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.Address = config.String(s)
return nil
}), "vault-addr", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Vault.RenewToken = config.Bool(b)
return nil
}), "vault-renew-token", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Vault.Retry.Enabled = config.Bool(b)
return nil
}), "vault-retry", "")
flags.Var((funcIntVar)(func(i int) error {
c.Vault.Retry.Attempts = config.Int(i)
return nil
}), "vault-retry-attempts", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.Vault.Retry.Backoff = config.TimeDuration(d)
return nil
}), "vault-retry-backoff", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Vault.SSL.Enabled = config.Bool(b)
return nil
}), "vault-ssl", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.SSL.CaCert = config.String(s)
return nil
}), "vault-ssl-ca-cert", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.SSL.CaPath = config.String(s)
return nil
}), "vault-ssl-ca-path", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.SSL.Cert = config.String(s)
return nil
}), "vault-ssl-cert", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.SSL.Key = config.String(s)
return nil
}), "vault-ssl-key", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.SSL.ServerName = config.String(s)
return nil
}), "vault-ssl-server-name", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Vault.SSL.Verify = config.Bool(b)
return nil
}), "vault-ssl-verify", "")
flags.Var((funcVar)(func(s string) error {
c.Vault.Token = config.String(s)
return nil
}), "vault-token", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Vault.UnwrapToken = config.Bool(b)
return nil
}), "vault-unwrap-token", "")
flags.Var((funcVar)(func(s string) error {
w, err := config.ParseWaitConfig(s)
if err != nil {
return err
}
c.Wait = w
return nil
}), "wait", "")
flags.BoolVar(&version, "v", false, "")
flags.BoolVar(&version, "version", false, "")
// TODO: Deprecations
for i, a := range args {
if a == "-auth" || strings.HasPrefix(a, "-auth=") {
log.Println("[WARN] -auth has been renamed to -consul-auth")
args[i] = strings.Replace(a, "-auth", "-consul-auth", 1)
}
if a == "-consul" || strings.HasPrefix(a, "-consul=") {
log.Println("[WARN] -consul has been renamed to -consul-addr")
args[i] = strings.Replace(a, "-consul", "-consul-addr", 1)
}
if strings.HasPrefix(a, "-ssl") {
log.Println("[WARN] -ssl options should be prefixed with -consul")
args[i] = strings.Replace(a, "-ssl", "-consul-ssl", 1)
}
}
// If there was a parser error, stop
if err := flags.Parse(args); err != nil {
return nil, false, false, false, err
}
// Error if extra arguments are present
args = flags.Args()
if len(args) > 0 {
return nil, false, false, false, fmt.Errorf("cli: extra args: %q", args)
}
// Create the final configuration
finalC := config.DefaultConfig()
// Merge all the provided configurations in the order supplied
for _, path := range configPaths {
c, err := config.FromPath(path)
if err != nil {
return nil, false, false, false, err
}
finalC = finalC.Merge(c)
}
// Add any CLI configuration options, since that's highest precedence
finalC = finalC.Merge(c)
// Finalize the configuration
finalC.Finalize()
return finalC, once, dry, version, nil
}
// parseFlags is a helper function for parsing command line flags using Go's
// Flag library. This is extracted into a helper to keep the main function
// small, but it also makes writing tests for parsing command line arguments
// much easier and cleaner.
func (cli *CLI) parseFlags(args []string) (*Config, bool, bool, error) {
var once, version bool
c := DefaultConfig()
// Parse the flags and options
flags := flag.NewFlagSet(Name, flag.ContinueOnError)
flags.SetOutput(cli.errStream)
flags.Usage = func() { fmt.Fprintf(cli.errStream, usage, Name) }
flags.Var((funcVar)(func(s string) error {
c.Consul = s
c.set("consul")
return nil
}), "consul", "")
flags.Var((funcVar)(func(s string) error {
c.Token = s
c.set("token")
return nil
}), "token", "")
flags.Var((funcVar)(func(s string) error {
c.Auth.Enabled = true
c.set("auth.enabled")
if strings.Contains(s, ":") {
split := strings.SplitN(s, ":", 2)
c.Auth.Username = split[0]
c.set("auth.username")
c.Auth.Password = split[1]
c.set("auth.password")
} else {
c.Auth.Username = s
c.set("auth.username")
}
return nil
}), "auth", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.SSL.Enabled = b
c.set("ssl")
c.set("ssl.enabled")
return nil
}), "ssl", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.SSL.Verify = b
c.set("ssl")
c.set("ssl.verify")
return nil
}), "ssl-verify", "")
flags.Var((funcVar)(func(s string) error {
c.SSL.Cert = s
c.set("ssl")
c.set("ssl.cert")
return nil
}), "ssl-cert", "")
flags.Var((funcVar)(func(s string) error {
c.SSL.Key = s
c.set("ssl")
c.set("ssl.key")
return nil
}), "ssl-key", "")
flags.Var((funcVar)(func(s string) error {
c.SSL.CaCert = s
c.set("ssl")
c.set("ssl.ca_cert")
return nil
}), "ssl-ca-cert", "")
flags.Var((funcVar)(func(s string) error {
c.SSL.CaPath = s
c.set("ssl")
c.set("ssl.ca_path")
return nil
}), "ssl-ca-path", "")
flags.Var((funcVar)(func(s string) error {
c.SSL.ServerName = s
c.set("ssl")
c.set("ssl.server_name")
return nil
}), "ssl-server-name", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.MaxStale = d
c.set("max_stale")
return nil
}), "max-stale", "")
flags.Var((funcVar)(func(s string) error {
p, err := ParsePrefix(s)
if err != nil {
return err
}
if c.Prefixes == nil {
c.Prefixes = make([]*Prefix, 0, 1)
}
c.Prefixes = append(c.Prefixes, p)
return nil
}), "prefix", "")
flags.Var((funcVar)(func(s string) error {
if c.Excludes == nil {
c.Excludes = make([]*Exclude, 0, 1)
}
c.Excludes = append(c.Excludes, &Exclude{Source: s})
return nil
}), "exclude", "")
flags.Var((funcBoolVar)(func(b bool) error {
c.Syslog.Enabled = b
c.set("syslog")
c.set("syslog.enabled")
return nil
}), "syslog", "")
flags.Var((funcVar)(func(s string) error {
c.Syslog.Facility = s
c.set("syslog.facility")
return nil
}), "syslog-facility", "")
flags.Var((funcVar)(func(s string) error {
w, err := config.ParseWaitConfig(s)
if err != nil {
return err
}
c.Wait.Min = w.Min
c.Wait.Max = w.Max
c.set("wait")
return nil
}), "wait", "")
flags.Var((funcDurationVar)(func(d time.Duration) error {
c.Retry = d
c.set("retry")
return nil
}), "retry", "")
flags.Var((funcVar)(func(s string) error {
c.Path = s
c.set("path")
return nil
}), "config", "")
flags.Var((funcVar)(func(s string) error {
c.PidFile = s
c.set("pid_file")
return nil
}), "pid-file", "")
flags.Var((funcVar)(func(s string) error {
c.StatusDir = s
c.set("status_dir")
return nil
}), "status-dir", "")
flags.Var((funcVar)(func(s string) error {
c.LogLevel = s
c.set("log_level")
return nil
}), "log-level", "")
flags.BoolVar(&once, "once", false, "")
flags.BoolVar(&version, "v", false, "")
flags.BoolVar(&version, "version", false, "")
// If there was a parser error, stop
if err := flags.Parse(args); err != nil {
return nil, false, false, err
}
// Error if extra arguments are present
args = flags.Args()
if len(args) > 0 {
return nil, false, false, fmt.Errorf("cli: extra argument(s): %q",
args)
}
return c, once, version, nil
}