logos-execution-zone/lez/sequencer/core/src/mock.rs

use std::time::Duration;

use anyhow::Result;
use common::block::Block;
use logos_blockchain_core::mantle::ops::channel::ChannelId;
use logos_blockchain_key_management_system_service::keys::Ed25519Key;
use logos_blockchain_zone_sdk::{Slot, ZoneMessage, sequencer::WithdrawArg};

use crate::{
    block_publisher::{
        BlockPublisherTrait, CheckpointSink, FinalizedBlockSink, OnDepositEventSink,
        OnWithdrawEventSink, SequencerCheckpoint,
    },
    config::BedrockConfig,
};

pub type SequencerCoreWithMockClients = crate::SequencerCore<MockBlockPublisher>;

#[derive(Clone)]
pub struct MockBlockPublisher {
    channel_id: ChannelId,
    /// Canned channel frontier returned by [`Self::channel_tip_slot`].
    tip_slot: Option<Slot>,
    /// Canned finalized channel history returned by [`Self::read_channel_after`].
    messages: Vec<(ZoneMessage, Slot)>,
}

impl MockBlockPublisher {
    /// Builds a mock publisher backed by a canned channel, for reconstruction
    /// and consistency tests. The default (via [`BlockPublisherTrait::new`])
    /// serves an empty channel.
    #[must_use]
    pub const fn with_canned_channel(
        channel_id: ChannelId,
        tip_slot: Option<Slot>,
        messages: Vec<(ZoneMessage, Slot)>,
    ) -> Self {
        Self {
            channel_id,
            tip_slot,
            messages,
        }
    }
}

impl BlockPublisherTrait for MockBlockPublisher {
    async fn new(
        config: &BedrockConfig,
        _bedrock_signing_key: Ed25519Key,
        _resubmit_interval: Duration,
        _initial_checkpoint: Option<SequencerCheckpoint>,
        _on_checkpoint: CheckpointSink,
        _on_finalized_block: FinalizedBlockSink,
        _on_deposit_event: OnDepositEventSink,
        _on_withdraw_event: OnWithdrawEventSink,
    ) -> Result<Self> {
        Ok(Self {
            channel_id: config.channel_id,
            tip_slot: None,
            messages: Vec::new(),
        })
    }

    async fn publish_block(
        &self,
        _block: &Block,
        _bridge_withdrawals: Vec<WithdrawArg>,
    ) -> Result<()> {
        Ok(())
    }

    fn channel_id(&self) -> ChannelId {
        self.channel_id
    }

    async fn channel_tip_slot(&self) -> Result<Option<Slot>> {
        Ok(self.tip_slot)
    }

    async fn read_channel_after(
        &self,
        after_slot: Option<Slot>,
    ) -> Result<Vec<(ZoneMessage, Slot)>> {
        // Mirror `next_messages`: `after_slot` is exclusive.
        Ok(self
            .messages
            .iter()
            .filter(|(_, slot)| after_slot.is_none_or(|after| *slot > after))
            .cloned()
            .collect())
    }
}