introduce fast_forward_singleton(), to change the coin of a singleton…

… spend

Cargo.toml

@@ -39,7 +39,11 @@ clvmr = "=0.3.0"
 hex = "=0.4.3"
 pyo3 = { version = ">=0.19.0", optional = true }
 clvm-utils = { version = "=0.2.7", path = "clvm-utils" }
+chia-traits = { version = "=0.1.0", path = "chia-traits" }
+clvm-traits = { version = "=0.1.0", path = "clvm-traits" }
+clvm-derive = { version = "=0.1.0", path = "clvm-derive" }
 chia-protocol = { version = "=0.2.7", path = "chia-protocol" }
+chia-wallet = { version = "=0.1.0", path = "chia-wallet" }
 hex-literal = "=0.4.1"
 thiserror = "1.0.44"
 

chia-protocol/src/bytes.rs

@@ -260,6 +260,12 @@ impl<'a, const N: usize> From<&'a BytesImpl<N>> for &'a [u8; N] {
     }
 }
 
+impl<const N: usize> From<&BytesImpl<N>> for [u8; N] {
+    fn from(v: &BytesImpl<N>) -> [u8; N] {
+        v.0
+    }
+}
+
 impl<'a, const N: usize> From<&'a BytesImpl<N>> for &'a [u8] {
     fn from(v: &'a BytesImpl<N>) -> &'a [u8] {
         &v.0

src/error.rs

@@ -0,0 +1,41 @@
+use crate::gen::validation_error::ValidationErr;
+use clvmr::reduction::EvalErr;
+use thiserror::Error;
+
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum Error {
+    #[error("CLVM {0}")]
+    Clvm(#[from] clvm_traits::Error),
+
+    #[error("Eval {0}")]
+    Eval(#[from] EvalErr),
+
+    #[error("Validation {0}")]
+    Validation(#[from] ValidationErr),
+
+    #[error("not a singleton mod hash")]
+    NotSingletonModHash,
+
+    #[error("inner puzzle hash mismatch")]
+    InnerPuzzleHashMismatch,
+
+    #[error("puzzle hash mismatch")]
+    PuzzleHashMismatch,
+
+    #[error("coin amount mismatch")]
+    CoinAmountMismatch,
+
+    #[error("coin amount is even")]
+    CoinAmountEven,
+
+    #[error("parent coin mismatch")]
+    ParentCoinMismatch,
+
+    #[error("coin mismatch")]
+    CoinMismatch,
+
+    #[error("{0}")]
+    Custom(String),
+}
+
+pub type Result<T> = std::result::Result<T, Error>;