reth/crates/storage/storage-api/src/noop.rs

//! Various noop implementations for traits.

use crate::{BlockHashReader, BlockNumReader};
use reth_chainspec::ChainInfo;
use reth_primitives::{BlockNumber, B256};
use reth_storage_errors::provider::ProviderResult;

/// Supports various api interfaces for testing purposes.
#[derive(Debug, Clone, Default, Copy)]
#[non_exhaustive]
pub struct NoopBlockReader;

/// Noop implementation for testing purposes
impl BlockHashReader for NoopBlockReader {
    fn block_hash(&self, _number: u64) -> ProviderResult<Option<B256>> {
        Ok(None)
    }

    fn canonical_hashes_range(
        &self,
        _start: BlockNumber,
        _end: BlockNumber,
    ) -> ProviderResult<Vec<B256>> {
        Ok(vec![])
    }
}

impl BlockNumReader for NoopBlockReader {
    fn chain_info(&self) -> ProviderResult<ChainInfo> {
        Ok(ChainInfo::default())
    }

    fn best_block_number(&self) -> ProviderResult<BlockNumber> {
        Ok(0)
    }

    fn last_block_number(&self) -> ProviderResult<BlockNumber> {
        Ok(0)
    }

    fn block_number(&self, _hash: B256) -> ProviderResult<Option<BlockNumber>> {
        Ok(None)
    }
}