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Never delete spent utxos from the database

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A `is_spent` field is added to LocalUtxo; when a txo is spent we set
this field to true instead of deleting the entire utxo from the
database.
This allows us to create txs double-spending txs already in blockchain.
Listunspent won't return spent utxos, effectively excluding them from the
coin selection and balance calculation
This commit is contained in:
Daniela Brozzoni
2022-03-09 16:15:34 +01:00
parent 3e4678d8e3
commit f2f0efc0b3
13 changed files with 155 additions and 66 deletions
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14
src/database/keyvalue.rs
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@@ -43,6 +43,7 @@ macro_rules! impl_batch_operations {
let value = json!({
"t": utxo.txout,
"i": utxo.keychain,
"s": utxo.is_spent,
});
self.insert(key, serde_json::to_vec(&value)?)$($after_insert)*;
@@ -125,8 +126,9 @@ macro_rules! impl_batch_operations {
let mut val: serde_json::Value = serde_json::from_slice(&b)?;
let txout = serde_json::from_value(val["t"].take())?;
let keychain = serde_json::from_value(val["i"].take())?;
let is_spent = val.get_mut("s").and_then(|s| s.take().as_bool()).unwrap_or(false);
Ok(Some(LocalUtxo { outpoint: outpoint.clone(), txout, keychain }))
Ok(Some(LocalUtxo { outpoint: outpoint.clone(), txout, keychain, is_spent, }))
}
}
}
@@ -246,11 +248,16 @@ impl Database for Tree {
let mut val: serde_json::Value = serde_json::from_slice(&v)?;
let txout = serde_json::from_value(val["t"].take())?;
let keychain = serde_json::from_value(val["i"].take())?;
let is_spent = val
.get_mut("s")
.and_then(|s| s.take().as_bool())
.unwrap_or(false);
Ok(LocalUtxo {
outpoint,
txout,
keychain,
is_spent,
})
})
.collect()
@@ -314,11 +321,16 @@ impl Database for Tree {
let mut val: serde_json::Value = serde_json::from_slice(&b)?;
let txout = serde_json::from_value(val["t"].take())?;
let keychain = serde_json::from_value(val["i"].take())?;
let is_spent = val
.get_mut("s")
.and_then(|s| s.take().as_bool())
.unwrap_or(false);
Ok(LocalUtxo {
outpoint: *outpoint,
txout,
keychain,
is_spent,
})
})
.transpose()