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//! Types for balance queries.
use casper_hashing::Digest;
use casper_types::{Key, StoredValue, URef, U512};
use crate::storage::trie::merkle_proof::TrieMerkleProof;
/// Result enum that represents all possible outcomes of a balance request.
#[derive(Debug)]
pub enum BalanceResult {
/// Returned if a passed state root hash is not found.
RootNotFound,
/// A query returned a balance.
Success {
/// Purse balance.
motes: U512,
/// A proof that the given value is present in the Merkle trie.
proof: Box<TrieMerkleProof<Key, StoredValue>>,
},
}
impl BalanceResult {
/// Returns the amount of motes for a [`BalanceResult::Success`] variant.
pub fn motes(&self) -> Option<&U512> {
match self {
BalanceResult::Success { motes, .. } => Some(motes),
_ => None,
}
}
/// Returns the Merkle proof for a given [`BalanceResult::Success`] variant.
pub fn proof(self) -> Option<TrieMerkleProof<Key, StoredValue>> {
match self {
BalanceResult::Success { proof, .. } => Some(*proof),
_ => None,
}
}
}
/// Represents a balance request.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct BalanceRequest {
state_hash: Digest,
purse_uref: URef,
}
impl BalanceRequest {
/// Creates a new [`BalanceRequest`].
pub fn new(state_hash: Digest, purse_uref: URef) -> Self {
BalanceRequest {
state_hash,
purse_uref,
}
}
/// Returns a state hash.
pub fn state_hash(&self) -> Digest {
self.state_hash
}
/// Returns a purse [`URef`].
pub fn purse_uref(&self) -> URef {
self.purse_uref
}
}