alloy_network_primitives/
block.rs

use alloy_primitives::B256;
use serde::{Deserialize, Serialize};

use alloc::{vec, vec::Vec};
use core::slice;

use crate::TransactionResponse;

/// Block Transactions depending on the boolean attribute of `eth_getBlockBy*`,
/// or if used by `eth_getUncle*`
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(untagged)]
pub enum BlockTransactions<T> {
    /// Full transactions
    Full(Vec<T>),
    /// Only hashes
    Hashes(Vec<B256>),
    /// Special case for uncle response.
    Uncle,
}

impl<T> Default for BlockTransactions<T> {
    fn default() -> Self {
        Self::Hashes(Vec::default())
    }
}

impl<T> BlockTransactions<T> {
    /// Check if the enum variant is used for hashes.
    #[inline]
    pub const fn is_hashes(&self) -> bool {
        matches!(self, Self::Hashes(_))
    }

    /// Fallibly cast to a slice of hashes.
    pub fn as_hashes(&self) -> Option<&[B256]> {
        match self {
            Self::Hashes(hashes) => Some(hashes),
            _ => None,
        }
    }

    /// Returns true if the enum variant is used for full transactions.
    #[inline]
    pub const fn is_full(&self) -> bool {
        matches!(self, Self::Full(_))
    }

    /// Fallibly cast to a slice of transactions.
    ///
    /// Returns `None` if the enum variant is not `Full`.
    pub fn as_transactions(&self) -> Option<&[T]> {
        match self {
            Self::Full(txs) => Some(txs),
            _ => None,
        }
    }

    /// Returns true if the enum variant is used for an uncle response.
    #[inline]
    pub const fn is_uncle(&self) -> bool {
        matches!(self, Self::Uncle)
    }

    /// Returns an iterator over the transactions (if any). This will be empty
    /// if the block is an uncle or if the transaction list contains only
    /// hashes.
    #[doc(alias = "transactions")]
    pub fn txns(&self) -> impl Iterator<Item = &T> {
        self.as_transactions().map(|txs| txs.iter()).unwrap_or_else(|| [].iter())
    }

    /// Returns an iterator over the transactions (if any). This will be empty if the block is not
    /// full.
    pub fn into_transactions(self) -> vec::IntoIter<T> {
        match self {
            Self::Full(txs) => txs.into_iter(),
            _ => vec::IntoIter::default(),
        }
    }

    /// Returns an instance of BlockTransactions with the Uncle special case.
    #[inline]
    pub const fn uncle() -> Self {
        Self::Uncle
    }

    /// Returns the number of transactions.
    #[inline]
    pub fn len(&self) -> usize {
        match self {
            Self::Hashes(h) => h.len(),
            Self::Full(f) => f.len(),
            Self::Uncle => 0,
        }
    }

    /// Whether the block has no transactions.
    #[inline]
    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }
}

impl<T: TransactionResponse> BlockTransactions<T> {
    /// Converts `self` into `Hashes`.
    #[inline]
    pub fn convert_to_hashes(&mut self) {
        if !self.is_hashes() {
            *self = Self::Hashes(self.hashes().collect());
        }
    }

    /// Converts `self` into `Hashes`.
    #[inline]
    pub fn into_hashes(mut self) -> Self {
        self.convert_to_hashes();
        self
    }

    /// Returns an iterator over the transaction hashes.
    #[deprecated = "use `hashes` instead"]
    #[inline]
    pub fn iter(&self) -> BlockTransactionHashes<'_, T> {
        self.hashes()
    }

    /// Returns an iterator over references to the transaction hashes.
    #[inline]
    pub fn hashes(&self) -> BlockTransactionHashes<'_, T> {
        BlockTransactionHashes::new(self)
    }
}

impl<T> From<Vec<B256>> for BlockTransactions<T> {
    fn from(hashes: Vec<B256>) -> Self {
        Self::Hashes(hashes)
    }
}

impl<T: TransactionResponse> From<Vec<T>> for BlockTransactions<T> {
    fn from(transactions: Vec<T>) -> Self {
        Self::Full(transactions)
    }
}

/// An iterator over the transaction hashes of a block.
///
/// See [`BlockTransactions::hashes`].
#[derive(Clone, Debug)]
pub struct BlockTransactionHashes<'a, T>(BlockTransactionHashesInner<'a, T>);

#[derive(Clone, Debug)]
enum BlockTransactionHashesInner<'a, T> {
    Hashes(slice::Iter<'a, B256>),
    Full(slice::Iter<'a, T>),
    Uncle,
}

impl<'a, T> BlockTransactionHashes<'a, T> {
    #[inline]
    fn new(txs: &'a BlockTransactions<T>) -> Self {
        Self(match txs {
            BlockTransactions::Hashes(txs) => BlockTransactionHashesInner::Hashes(txs.iter()),
            BlockTransactions::Full(txs) => BlockTransactionHashesInner::Full(txs.iter()),
            BlockTransactions::Uncle => BlockTransactionHashesInner::Uncle,
        })
    }
}

impl<T: TransactionResponse> Iterator for BlockTransactionHashes<'_, T> {
    type Item = B256;

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        match &mut self.0 {
            BlockTransactionHashesInner::Hashes(txs) => txs.next().copied(),
            BlockTransactionHashesInner::Full(txs) => txs.next().map(|tx| tx.tx_hash()),
            BlockTransactionHashesInner::Uncle => None,
        }
    }

    #[inline]
    fn size_hint(&self) -> (usize, Option<usize>) {
        match &self.0 {
            BlockTransactionHashesInner::Full(txs) => txs.size_hint(),
            BlockTransactionHashesInner::Hashes(txs) => txs.size_hint(),
            BlockTransactionHashesInner::Uncle => (0, Some(0)),
        }
    }
}

impl<T: TransactionResponse> ExactSizeIterator for BlockTransactionHashes<'_, T> {
    #[inline]
    fn len(&self) -> usize {
        match &self.0 {
            BlockTransactionHashesInner::Full(txs) => txs.len(),
            BlockTransactionHashesInner::Hashes(txs) => txs.len(),
            BlockTransactionHashesInner::Uncle => 0,
        }
    }
}

impl<T: TransactionResponse> DoubleEndedIterator for BlockTransactionHashes<'_, T> {
    #[inline]
    fn next_back(&mut self) -> Option<Self::Item> {
        match &mut self.0 {
            BlockTransactionHashesInner::Full(txs) => txs.next_back().map(|tx| tx.tx_hash()),
            BlockTransactionHashesInner::Hashes(txs) => txs.next_back().copied(),
            BlockTransactionHashesInner::Uncle => None,
        }
    }
}

#[cfg(feature = "std")]
impl<T: TransactionResponse> std::iter::FusedIterator for BlockTransactionHashes<'_, T> {}

/// Determines how the `transactions` field of block should be filled.
///
/// This essentially represents the `full:bool` argument in RPC calls that determine whether the
/// response should include full transaction objects or just the hashes.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
pub enum BlockTransactionsKind {
    /// Only include hashes: [BlockTransactions::Hashes]
    #[default]
    Hashes,
    /// Include full transaction objects: [BlockTransactions::Full]
    Full,
}

impl From<bool> for BlockTransactionsKind {
    fn from(is_full: bool) -> Self {
        if is_full {
            Self::Full
        } else {
            Self::Hashes
        }
    }
}

impl From<BlockTransactionsKind> for bool {
    fn from(kind: BlockTransactionsKind) -> Self {
        match kind {
            BlockTransactionsKind::Full => true,
            BlockTransactionsKind::Hashes => false,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_full_conversion() {
        let full = true;
        assert_eq!(BlockTransactionsKind::Full, full.into());

        let full = false;
        assert_eq!(BlockTransactionsKind::Hashes, full.into());
    }
}
alloy_network_primitives/block.rs

alloy_network_primitives/
block.rs
