Blockchain: add alt-block handling

helper/Cargo.toml

@@ -9,8 +9,9 @@ repository = "https://github.com/Cuprate/cuprate/tree/main/consensus"
 
 
 [features]
+# TODO: I don't think this is a good idea
 # All features on by default.
-default   = ["std", "atomic", "asynch", "cast", "fs", "num", "map", "time", "thread", "constants"]
+default   = ["std", "atomic", "asynch", "cast", "fs", "num", "map", "time", "thread", "constants", "tx-utils"]
 std       = []
 atomic    = ["dep:crossbeam"]
 asynch    = ["dep:futures", "dep:rayon"]
@@ -21,6 +22,7 @@ num       = []
 map       = ["cast", "dep:monero-serai"]
 time      = ["dep:chrono", "std"]
 thread    = ["std", "dep:target_os_lib"]
+tx-utils  = ["dep:monero-serai"]
 
 [dependencies]
 crossbeam    = { workspace = true, optional = true }

helper/src/lib.rs

@@ -31,6 +31,8 @@ pub mod thread;
 #[cfg(feature = "time")]
 pub mod time;
 
+#[cfg(feature = "tx-utils")]
+pub mod tx_utils;
 //---------------------------------------------------------------------------------------------------- Private Usage
 
 //----------------------------------------------------------------------------------------------------

helper/src/tx_utils.rs

@@ -0,0 +1,34 @@
+//! Utils for working with [`Transaction`]
+
+use monero_serai::transaction::{Input, Transaction};
+
+/// Calculates the fee of the [`Transaction`].
+///
+/// # Panics
+/// This will panic if the inputs overflow or the transaction outputs too much, so should only
+/// be used on known to be valid txs.
+pub fn tx_fee(tx: &Transaction) -> u64 {
+    let mut fee = 0_u64;
+
+    match &tx {
+        Transaction::V1 { prefix, .. } => {
+            for input in &prefix.inputs {
+                match input {
+                    Input::Gen(_) => return 0,
+                    Input::ToKey { amount, .. } => {
+                        fee = fee.checked_add(amount.unwrap_or(0)).unwrap();
+                    }
+                }
+            }
+
+            for output in &prefix.outputs {
+                fee = fee.checked_sub(output.amount.unwrap_or(0)).unwrap();
+            }
+        }
+        Transaction::V2 { proofs, .. } => {
+            fee = proofs.as_ref().unwrap().base.fee;
+        }
+    };
+
+    fee
+}

storage/blockchain/Cargo.toml

@@ -25,11 +25,12 @@ cuprate-database         = { path = "../database" }
 cuprate-database-service = { path = "../service" }
 cuprate-helper           = { path = "../../helper", features = ["fs", "thread", "map"] }
 cuprate-types            = { path = "../../types", features = ["blockchain"] }
+cuprate-pruning          = { path = "../../pruning" }
 
 bitflags         = { workspace = true, features = ["std", "serde", "bytemuck"] }
 bytemuck         = { workspace = true, features = ["must_cast", "derive", "min_const_generics", "extern_crate_alloc"] }
 curve25519-dalek = { workspace = true }
-cuprate-pruning  = { path = "../../pruning" }
+rand             = { workspace = true }
 monero-serai     = { workspace = true, features = ["std"] }
 serde            = { workspace = true, optional = true }