watchtower/conf_experimental: adds CLI options in experimental builds

watchtower/conf_experimental.go

@@ -0,0 +1,65 @@
+// +build experimental
+
+package watchtower
+
+import (
+	"time"
+
+	"github.com/lightningnetwork/lnd/lncfg"
+)
+
+// Conf specifies the watchtower options that can be configured from the command
+// line or configuration file.
+type Conf struct {
+	RawListeners []string `long:"listen" description:"Add interfaces/ports to listen for peer connections"`
+
+	ReadTimeout time.Duration `long:"readtimeout" description:"Duration the watchtower server will wait for messages to be received before hanging up on clients"`
+
+	WriteTimeout time.Duration `long:"writetimeout" description:"Duration the watchtower server will wait for messages to be written before hanging up on client connections"`
+}
+
+// Apply completes the passed Config struct by applying any parsed Conf options.
+// If the corresponding values parsed by Conf are already set in the Config,
+// those fields will be not be modified.
+func (c *Conf) Apply(cfg *Config) (*Config, error) {
+	// Set the Config's listening addresses if they are empty.
+	if cfg.ListenAddrs == nil {
+		// Without a network, we will be unable to resolve the listening
+		// addresses.
+		if cfg.Net == nil {
+			return nil, ErrNoNetwork
+		}
+
+		// If no addresses are specified by the Config, we will resort
+		// to the default peer port.
+		if len(c.RawListeners) == 0 {
+			addr := DefaultPeerPortStr
+			c.RawListeners = append(c.RawListeners, addr)
+		}
+
+		// Normalize the raw listening addresses so that they can be
+		// used by the brontide listener.
+		var err error
+		cfg.ListenAddrs, err = lncfg.NormalizeAddresses(
+			c.RawListeners, DefaultPeerPortStr,
+			cfg.Net.ResolveTCPAddr,
+		)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// If the Config has no read timeout, we will use the parsed Conf
+	// value.
+	if cfg.ReadTimeout == 0 && c.ReadTimeout != 0 {
+		cfg.ReadTimeout = c.ReadTimeout
+	}
+
+	// If the Config has no write timeout, we will use the parsed Conf
+	// value.
+	if cfg.WriteTimeout == 0 && c.WriteTimeout != 0 {
+		cfg.WriteTimeout = c.WriteTimeout
+	}
+
+	return cfg, nil
+}