add an option for the swarm dial timeout

config/config.go

@@ -75,6 +75,8 @@ type Config struct {
 	Insecure           bool
 	PSK                pnet.PSK
 
+	DialTimeout time.Duration
+
 	RelayCustom bool
 	Relay       bool // should the relay transport be used
 
@@ -136,8 +138,18 @@ func (cfg *Config) makeSwarm() (*swarm.Swarm, error) {
 		return nil, err
 	}
 
+	opts := make([]swarm.Option, 0, 3)
+	if cfg.Reporter != nil {
+		opts = append(opts, swarm.WithMetrics(cfg.Reporter))
+	}
+	if cfg.ConnectionGater != nil {
+		opts = append(opts, swarm.WithConnectionGater(cfg.ConnectionGater))
+	}
+	if cfg.DialTimeout != 0 {
+		opts = append(opts, swarm.WithDialTimeout(cfg.DialTimeout))
+	}
 	// TODO: Make the swarm implementation configurable.
-	return swarm.NewSwarm(pid, cfg.Peerstore, swarm.WithMetrics(cfg.Reporter), swarm.WithConnectionGater(cfg.ConnectionGater))
+	return swarm.NewSwarm(pid, cfg.Peerstore, opts...)
 }
 
 func (cfg *Config) addTransports(h host.Host) error {

options.go

@@ -461,3 +461,13 @@ func EnableHolePunching(opts ...holepunch.Option) Option {
 		return nil
 	}
 }
+
+func WithDialTimeout(t time.Duration) Option {
+	return func(cfg *Config) error {
+		if t <= 0 {
+			return errors.New("dial timeout needs to be non-negative")
+		}
+		cfg.DialTimeout = t
+		return nil
+	}
+}