Sequencer 모드

pub enum NodeMode {
    /// Validator mode.
    Validator,
    /// Sequencer mode.
    Sequencer,
}

pub struct SequencerConfig {
    /// Whether or not the sequencer is enabled at startup.
    pub sequencer_stopped: bool,
    /// Whether or not the sequencer is in recovery mode.
    pub sequencer_recovery_mode: bool,
    /// The Url for the conductor RPC endpoint. If Some, enables the conductor service.
    pub conductor_rpc_url: Option<Url>,
    /// The confirmation delay for the sequencer.
    pub l1_conf_delay: u64,
}

use kona_node_service::{NodeMode, RollupNodeBuilder, SequencerConfig};

// Configure sequencer settings
let sequencer_config = SequencerConfig {
    sequencer_stopped: false,           // Start sequencer immediately
    sequencer_recovery_mode: false,     // Normal operation mode
    conductor_rpc_url: Some(            // Optional conductor integration
        Url::parse("http://conductor:8080").unwrap()
    ),
    l1_conf_delay: 4,                   // L1 origin confirmation delay
};

// engine_config carries `mode: NodeMode::Sequencer` along with the
// L2 engine URL, JWT secret, and L1 RPC URL. A sequencer needs a block
// signer: `p2p_config.gossip_signer` must be `Some`, or `start` fails.
RollupNodeBuilder::new(
    rollup_config,
    l1_config_builder,
    l2_trust_rpc,
    engine_config,
    p2p_config,
    rpc_config,
)
.with_sequencer_config(sequencer_config)
.build()
.start()
.await?;