Error interface overhaul

src/ledger/errors.rs

@@ -7,11 +7,9 @@ use thiserror::Error;
 /// Ledger error types.
 #[derive(Error, Debug)]
 pub enum LedgerError {
-    #[error("Ledger returned a general error: {0}")]
-    General(String),
-    #[error("Transaction is not OK: {0}")]
+    #[error("Transaction error: {0}")]
     Transaction(String),
-    #[error("UTXO cannot be spend: {0}")]
+    #[error("UTXO error: {0}")]
     Utxo(String),
 }
 

src/ledger/transactions.rs

@@ -62,7 +62,7 @@ impl Ledger {
             .iter()
             .find(|tx| tx.compute_txid() == txid)
             .ok_or(LedgerError::Transaction(format!(
-                "No transaction is matched with {}",
+                "No transaction with txid {} found in ledger",
                 txid
             )))?
             .to_owned();
@@ -81,7 +81,7 @@ impl Ledger {
 
         if input_value < output_value {
             return Err(LedgerError::Transaction(format!(
-                "Input value {} is not above or equal of output value {}",
+                "Input amount is smaller than output amount: {} < {}",
                 input_value, output_value
             )));
         }

src/ledger/utxo.rs

@@ -51,7 +51,7 @@ impl Ledger {
                 .output
                 .get(utxo.vout as usize)
                 .ok_or(LedgerError::Utxo(format!(
-                    "vout {} couldn't be found in transaction with txid {}",
+                    "Vout {} couldn't be found in transaction with txid {}",
                     utxo.vout, utxo.txid
                 )))?;