Add a utility function to convert currency.

lightspark/src/error.rs

@@ -15,6 +15,7 @@ pub enum Error {
     CryptoError(CryptoError),
     WebhookSignatureError,
     SigningKeyNotFound,
+    InvalidCurrencyConversion,
 }
 
 impl fmt::Display for Error {
@@ -31,6 +32,7 @@ impl fmt::Display for Error {
                 write!(f, "Webhook message hash does not match signature")
             }
             Self::SigningKeyNotFound => write!(f, "Signing key not found"),
+            Self::InvalidCurrencyConversion => write!(f, "Invalid currency conversion"),
         }
     }
 }

lightspark/src/lib.rs

@@ -44,5 +44,7 @@ pub mod objects;
 pub mod request;
 #[cfg(feature = "base")]
 pub mod types;
+#[cfg(feature = "objects")]
+pub mod utils;
 #[cfg(feature = "webhooks")]
 pub mod webhooks;

lightspark/src/utils.rs

@@ -0,0 +1,19 @@
+use crate::{error::Error, objects::currency_amount::CurrencyAmount};
+
+pub fn value_millisatoshi(amount: CurrencyAmount) -> Result<i64, Error> {
+    match amount.original_unit {
+        crate::objects::currency_unit::CurrencyUnit::Bitcoin => {
+            Ok(amount.original_value * 100_000_000_000)
+        }
+        crate::objects::currency_unit::CurrencyUnit::Satoshi => Ok(amount.original_value * 1000),
+        crate::objects::currency_unit::CurrencyUnit::Millisatoshi => Ok(amount.original_value),
+        crate::objects::currency_unit::CurrencyUnit::Usd => Err(Error::InvalidCurrencyConversion),
+        crate::objects::currency_unit::CurrencyUnit::Nanobitcoin => Ok(amount.original_value * 100),
+        crate::objects::currency_unit::CurrencyUnit::Microbitcoin => {
+            Ok(amount.original_value * 100_000)
+        }
+        crate::objects::currency_unit::CurrencyUnit::Millibitcoin => {
+            Ok(amount.original_value * 100_000_000)
+        }
+    }
+}