ledger: Move transaction related stuff to it's own file.

src/ledger/transactions.rs

@@ -0,0 +1,56 @@
+//! # Transaction Related Ledger Operations
+
+use super::Ledger;
+use bitcoin::TxOut;
+
+impl Ledger {
+    /// Adds a new UTXO to user's UTXO's.
+    pub fn add_utxo(&self, utxo: TxOut) -> Self {
+        let mut ledger = self.clone().to_owned();
+
+        ledger.utxos.push(utxo);
+
+        ledger
+    }
+    /// Returns UTXO's of the user.
+    pub fn get_utxos(&self) -> Vec<TxOut> {
+        self.utxos.clone()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::ledger::Ledger;
+    use bitcoin::{Address, Amount, Network, TxOut, XOnlyPublicKey};
+    use secp256k1::Secp256k1;
+
+    #[test]
+    fn add_utxo() {
+        let mut ledger = Ledger::new();
+
+        assert_eq!(ledger.utxos.len(), 0);
+        assert_eq!(ledger.addresses.len(), 0);
+
+        // Generate a random address.
+        let secp = Secp256k1::new();
+        let xonly_public_key = XOnlyPublicKey::from_slice(&[
+            0x78u8, 0x19u8, 0x90u8, 0xd7u8, 0xe2u8, 0x11u8, 0x8cu8, 0xc3u8, 0x61u8, 0xa9u8, 0x3au8,
+            0x6fu8, 0xccu8, 0x54u8, 0xceu8, 0x61u8, 0x1du8, 0x6du8, 0xf3u8, 0x81u8, 0x68u8, 0xd6u8,
+            0xb1u8, 0xedu8, 0xfbu8, 0x55u8, 0x65u8, 0x35u8, 0xf2u8, 0x20u8, 0x0cu8, 0x4b,
+        ])
+        .unwrap();
+        let address = Address::p2tr(&secp, xonly_public_key, None, Network::Regtest);
+        ledger = ledger.add_address(address);
+        assert_eq!(ledger.addresses.len(), 1);
+
+        // Insert a dummy UTXO.
+        let utxo = TxOut {
+            value: Amount::from_sat(0x45),
+            script_pubkey: ledger.addresses[0].script_pubkey(),
+        };
+        ledger = ledger.add_utxo(utxo);
+
+        assert_eq!(ledger.utxos.len(), 1);
+        assert_eq!(ledger.utxos[0].value, Amount::from_sat(0x45));
+    }
+}