Add single random draw selection algorithm

CHANGELOG.md

@@ -1,3 +1,7 @@
 # 0.1.0 - 2022-12-17
 
 * Initial release.
+
+# 0.2.0 - 2023-06-03
+
+- Add Single Random Draw module and a basic error type.

Cargo.toml

@@ -8,14 +8,19 @@ homepage = "https://github.com/rust-bitcoin/rust-bitcoin-coin-selection/"
 license = "CC0-1.0"
 name = "rust-bitcoin-coin-selection"
 repository = "https://github.com/rust-bitcoin/rust-bitcoin-coin-selection/"
-version = "0.1.0"
+version = "0.2.0"
 # documentation = "https://docs.rs/bitcoin-coin-selection/"
 description = "Libary providing utility functions to efficiently select a set of UTXOs."
 keywords = ["crypto", "bitcoin"]
 readme = "README.md"
 
 [dependencies]
+bitcoin = { git="https://github.com/yancyribbens/rust-bitcoin", branch="master" }
 rand = {version = "0.8.5", default-features = false, optional = true}
 
 [dev-dependencies]
+rust-bitcoin-coin-selection = {path = ".", features = ["rand"]}
 rand = "0.8.5"
+
+[patch.crates-io]
+bitcoin_hashes = { git="https://github.com/yancyribbens/rust-bitcoin.git" }

clippy.toml

@@ -1 +1 @@
-msrv = "1.41.1"
+msrv = "1.48.0"

src/errors.rs

@@ -0,0 +1,26 @@
+/// Error types.
+use bitcoin::FeeRate;
+use bitcoin::Weight;
+use std::error::Error as E;
+use std::fmt;
+
+#[derive(Debug)]
+pub enum Error {
+    Multiplication(Weight, FeeRate),
+    SizeMismatch(usize, usize),
+}
+
+impl E for Error {}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Error::Multiplication(weight, fee_rate) => {
+                write!(f, "{} * {} exceeds u64 Max", weight, fee_rate)
+            },
+            Error::SizeMismatch(input_count, output_count) => {
+                write!(f, "the number of inputs: {} and outputs: {} does not match", input_count, output_count)
+            }
+        }
+    }
+}