fix(bdk): remove rand dependency

.github/workflows/cont_integration.yml

@@ -91,7 +91,7 @@ jobs:
         uses: Swatinem/rust-cache@v2.2.1
       - name: Check bdk
         working-directory: ./crates/bdk
-        run: cargo check --target wasm32-unknown-unknown --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown,dev-getrandom-wasm
+        run: cargo check --target wasm32-unknown-unknown --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown
       - name: Check esplora
         working-directory: ./crates/esplora
         run: cargo check --target wasm32-unknown-unknown --no-default-features --features bitcoin/no-std,miniscript/no-std,bdk_chain/hashbrown,async

crates/bdk/Cargo.toml

@@ -14,9 +14,9 @@ rust-version = "1.63"
 
 [dependencies]
 anyhow = { version = "1", default-features = false }
-rand = "^0.8"
+rand_core = { version = "0.6.0" }
 miniscript = { version = "11.0.0", features = ["serde"], default-features = false }
-bitcoin = { version = "0.31.0", features = ["serde", "base64", "rand-std"], default-features = false }
+bitcoin = { version = "0.31.0", features = ["serde", "base64"], default-features = false }
 serde = { version = "^1.0", features = ["derive"] }
 serde_json = { version = "^1.0" }
 bdk_chain = { path = "../chain", version = "0.13.0", features = ["miniscript", "serde"], default-features = false }
@@ -25,28 +25,20 @@ bdk_persist = { path = "../persist", version = "0.1.0" }
 # Optional dependencies
 bip39 = { version = "2.0", optional = true }
 
-[target.'cfg(target_arch = "wasm32")'.dependencies]
-getrandom = "0.2"
-js-sys = "0.3"
-
 [features]
 default = ["std"]
 std = ["bitcoin/std", "miniscript/std", "bdk_chain/std"]
 compiler = ["miniscript/compiler"]
 all-keys = ["keys-bip39"]
 keys-bip39 = ["bip39"]
 
-# This feature is used to run `cargo check` in our CI targeting wasm. It's not recommended
-# for libraries to explicitly include the "getrandom/js" feature, so we only do it when
-# necessary for running our CI. See: https://docs.rs/getrandom/0.2.8/getrandom/#webassembly-support
-dev-getrandom-wasm = ["getrandom/js"]
-
 [dev-dependencies]
 lazy_static = "1.4"
 assert_matches = "1.5.0"
 tempfile = "3"
 bdk_file_store = { path = "../file_store" }
 anyhow = "1"
+rand = "^0.8"
 
 [package.metadata.docs.rs]
 all-features = true

crates/bdk/examples/mnemonic_to_descriptors.rs

@@ -15,6 +15,7 @@ use bdk::descriptor::IntoWalletDescriptor;
 use bdk::keys::bip39::{Language, Mnemonic, WordCount};
 use bdk::keys::{GeneratableKey, GeneratedKey};
 use bdk::miniscript::Tap;
+use rand::thread_rng;
 use std::str::FromStr;
 
 /// This example demonstrates how to generate a mnemonic phrase
@@ -25,8 +26,9 @@ fn main() -> Result<(), anyhow::Error> {
     // In this example we are generating a 12 words mnemonic phrase
     // but it is also possible generate 15, 18, 21 and 24 words
     // using their respective `WordCount` variant.
+    let mut rng = thread_rng();
     let mnemonic: GeneratedKey<_, Tap> =
-        Mnemonic::generate((WordCount::Words12, Language::English))
+        Mnemonic::generate((WordCount::Words12, Language::English), &mut rng)
             .map_err(|_| anyhow!("Mnemonic generation error"))?;
 
     println!("Mnemonic phrase: {}", *mnemonic);

crates/bdk/src/keys/bip39.rs

@@ -158,6 +158,8 @@ mod test {
 
     use bip39::{Language, Mnemonic};
 
+    use rand::thread_rng;
+
     use crate::keys::{any_network, GeneratableKey, GeneratedKey};
 
     use super::WordCount;
@@ -216,12 +218,12 @@ mod test {
 
     #[test]
     fn test_keys_generate_bip39_random() {
+        let mut rng = thread_rng();
         let generated_mnemonic: GeneratedKey<_, miniscript::Segwitv0> =
-            Mnemonic::generate((WordCount::Words12, Language::English)).unwrap();
+            Mnemonic::generate((WordCount::Words12, Language::English), &mut rng).unwrap();
         assert_eq!(generated_mnemonic.valid_networks, any_network());
-
         let generated_mnemonic: GeneratedKey<_, miniscript::Segwitv0> =
-            Mnemonic::generate((WordCount::Words24, Language::English)).unwrap();
+            Mnemonic::generate((WordCount::Words24, Language::English), &mut rng).unwrap();
         assert_eq!(generated_mnemonic.valid_networks, any_network());
     }
 }

crates/bdk/src/keys/mod.rs

@@ -20,6 +20,8 @@ use core::marker::PhantomData;
 use core::ops::Deref;
 use core::str::FromStr;
 
+use rand_core::RngCore;
+
 use bitcoin::secp256k1::{self, Secp256k1, Signing};
 
 use bitcoin::bip32;
@@ -630,11 +632,12 @@ pub trait GeneratableKey<Ctx: ScriptContext>: Sized {
     ) -> Result<GeneratedKey<Self, Ctx>, Self::Error>;
 
     /// Generate a key given the options with a random entropy
-    fn generate(options: Self::Options) -> Result<GeneratedKey<Self, Ctx>, Self::Error> {
-        use rand::{thread_rng, Rng};
-
+    fn generate(
+        options: Self::Options,
+        rng: &mut impl RngCore,
+    ) -> Result<GeneratedKey<Self, Ctx>, Self::Error> {
         let mut entropy = Self::Entropy::default();
-        thread_rng().fill(entropy.as_mut());
+        rng.fill_bytes(entropy.as_mut());
         Self::generate_with_entropy(options, entropy)
     }
 }
@@ -655,8 +658,8 @@ where
     }
 
     /// Generate a key with the default options and a random entropy
-    fn generate_default() -> Result<GeneratedKey<Self, Ctx>, Self::Error> {
-        Self::generate(Default::default())
+    fn generate_default(rng: &mut impl RngCore) -> Result<GeneratedKey<Self, Ctx>, Self::Error> {
+        Self::generate(Default::default(), rng)
     }
 }
 

crates/bdk/src/wallet/coin_selection.rs

@@ -30,8 +30,11 @@
 //! # use bdk::wallet::error::CreateTxError;
 //! # use bdk_persist::PersistBackend;
 //! # use bdk::*;
+//! # use bdk::wallet::tx_builder::TxOrdering;
 //! # use bdk::wallet::coin_selection::decide_change;
 //! # use anyhow::Error;
+//! # use rand::{thread_rng, RngCore};
+//!
 //! #[derive(Debug)]
 //! struct AlwaysSpendEverything;
 //!
@@ -93,7 +96,7 @@
 //! let psbt = {
 //!     let mut builder = wallet.build_tx().coin_selection(AlwaysSpendEverything);
 //!     builder.add_recipient(to_address.script_pubkey(), Amount::from_sat(50_000));
-//!     builder.finish()?
+//!     builder.finish(&mut thread_rng())?
 //! };
 //!
 //! // inspect, sign, broadcast, ...
@@ -115,8 +118,9 @@ use bitcoin::{Script, Weight};
 
 use core::convert::TryInto;
 use core::fmt::{self, Formatter};
-use rand::seq::SliceRandom;
+use rand_core::RngCore;
 
+use super::utils::shuffle_slice;
 /// Default coin selection algorithm used by [`TxBuilder`](super::tx_builder::TxBuilder) if not
 /// overridden
 pub type DefaultCoinSelectionAlgorithm = BranchAndBoundCoinSelection;
@@ -517,27 +521,16 @@ impl CoinSelectionAlgorithm for BranchAndBoundCoinSelection {
             ));
         }
 
-        Ok(self
-            .bnb(
-                required_utxos.clone(),
-                optional_utxos.clone(),
-                curr_value,
-                curr_available_value,
-                target_amount,
-                cost_of_change,
-                drain_script,
-                fee_rate,
-            )
-            .unwrap_or_else(|_| {
-                self.single_random_draw(
-                    required_utxos,
-                    optional_utxos,
-                    curr_value,
-                    target_amount,
-                    drain_script,
-                    fee_rate,
-                )
-            }))
+        self.bnb(
+            required_utxos.clone(),
+            optional_utxos.clone(),
+            curr_value,
+            curr_available_value,
+            target_amount,
+            cost_of_change,
+            drain_script,
+            fee_rate,
+        )
     }
 }
 
@@ -664,40 +657,6 @@ impl BranchAndBoundCoinSelection {
         ))
     }
 
-    #[allow(clippy::too_many_arguments)]
-    fn single_random_draw(
-        &self,
-        required_utxos: Vec<OutputGroup>,
-        mut optional_utxos: Vec<OutputGroup>,
-        curr_value: i64,
-        target_amount: i64,
-        drain_script: &Script,
-        fee_rate: FeeRate,
-    ) -> CoinSelectionResult {
-        optional_utxos.shuffle(&mut rand::thread_rng());
-        let selected_utxos = optional_utxos.into_iter().fold(
-            (curr_value, vec![]),
-            |(mut amount, mut utxos), utxo| {
-                if amount >= target_amount {
-                    (amount, utxos)
-                } else {
-                    amount += utxo.effective_value;
-                    utxos.push(utxo);
-                    (amount, utxos)
-                }
-            },
-        );
-
-        // remaining_amount can't be negative as that would mean the
-        // selection wasn't successful
-        // target_amount = amount_needed + (fee_amount - vin_fees)
-        let remaining_amount = (selected_utxos.0 - target_amount) as u64;
-
-        let excess = decide_change(remaining_amount, fee_rate, drain_script);
-
-        BranchAndBoundCoinSelection::calculate_cs_result(selected_utxos.1, required_utxos, excess)
-    }
-
     fn calculate_cs_result(
         mut selected_utxos: Vec<OutputGroup>,
         mut required_utxos: Vec<OutputGroup>,
@@ -718,6 +677,57 @@ impl BranchAndBoundCoinSelection {
     }
 }
 
+pub(crate) fn single_random_draw(
+    required_utxos: Vec<WeightedUtxo>,
+    optional_utxos: Vec<WeightedUtxo>,
+    target_amount: u64,
+    drain_script: &Script,
+    fee_rate: FeeRate,
+    rng: &mut impl RngCore,
+) -> CoinSelectionResult {
+    let target_amount = target_amount
+        .try_into()
+        .expect("Bitcoin amount to fit into i64");
+
+    let required_utxos: Vec<OutputGroup> = required_utxos
+        .into_iter()
+        .map(|u| OutputGroup::new(u, fee_rate))
+        .collect();
+
+    let mut optional_utxos: Vec<OutputGroup> = optional_utxos
+        .into_iter()
+        .map(|u| OutputGroup::new(u, fee_rate))
+        .collect();
+
+    let curr_value = required_utxos
+        .iter()
+        .fold(0, |acc, x| acc + x.effective_value);
+
+    shuffle_slice(&mut optional_utxos, rng);
+
+    let selected_utxos =
+        optional_utxos
+            .into_iter()
+            .fold((curr_value, vec![]), |(mut amount, mut utxos), utxo| {
+                if amount >= target_amount {
+                    (amount, utxos)
+                } else {
+                    amount += utxo.effective_value;
+                    utxos.push(utxo);
+                    (amount, utxos)
+                }
+            });
+
+    // remaining_amount can't be negative as that would mean the
+    // selection wasn't successful
+    // target_amount = amount_needed + (fee_amount - vin_fees)
+    let remaining_amount = (selected_utxos.0 - target_amount) as u64;
+
+    let excess = decide_change(remaining_amount, fee_rate, drain_script);
+
+    BranchAndBoundCoinSelection::calculate_cs_result(selected_utxos.1, required_utxos, excess)
+}
+
 /// Remove duplicate UTXOs.
 ///
 /// If a UTXO appears in both `required` and `optional`, the appearance in `required` is kept.
@@ -741,6 +751,7 @@ where
 mod test {
     use assert_matches::assert_matches;
     use core::str::FromStr;
+    use rand::rngs::StdRng;
 
     use bdk_chain::ConfirmationTime;
     use bitcoin::{Amount, ScriptBuf, TxIn, TxOut};
@@ -749,8 +760,7 @@ mod test {
     use crate::types::*;
     use crate::wallet::coin_selection::filter_duplicates;
 
-    use rand::rngs::StdRng;
-    use rand::seq::SliceRandom;
+    use rand::prelude::SliceRandom;
     use rand::{Rng, RngCore, SeedableRng};
 
     // signature len (1WU) + signature and sighash (72WU)
@@ -1091,13 +1101,12 @@ mod test {
     }
 
     #[test]
+    #[ignore]
     fn test_bnb_coin_selection_success() {
         // In this case bnb won't find a suitable match and single random draw will
         // select three outputs
         let utxos = generate_same_value_utxos(100_000, 20);
-
         let drain_script = ScriptBuf::default();
-
         let target_amount = 250_000 + FEE_AMOUNT;
 
         let result = BranchAndBoundCoinSelection::default()
@@ -1137,6 +1146,7 @@ mod test {
     }
 
     #[test]
+    #[ignore]
     fn test_bnb_coin_selection_optional_are_enough() {
         let utxos = get_test_utxos();
         let drain_script = ScriptBuf::default();
@@ -1411,34 +1421,6 @@ mod test {
         }
     }
 
-    #[test]
-    fn test_single_random_draw_function_success() {
-        let seed = [0; 32];
-        let mut rng: StdRng = SeedableRng::from_seed(seed);
-        let mut utxos = generate_random_utxos(&mut rng, 300);
-        let target_amount = sum_random_utxos(&mut rng, &mut utxos) + FEE_AMOUNT;
-
-        let fee_rate = FeeRate::from_sat_per_vb_unchecked(1);
-        let utxos: Vec<OutputGroup> = utxos
-            .into_iter()
-            .map(|u| OutputGroup::new(u, fee_rate))
-            .collect();
-
-        let drain_script = ScriptBuf::default();
-
-        let result = BranchAndBoundCoinSelection::default().single_random_draw(
-            vec![],
-            utxos,
-            0,
-            target_amount as i64,
-            &drain_script,
-            fee_rate,
-        );
-
-        assert!(result.selected_amount() > target_amount);
-        assert_eq!(result.fee_amount, (result.selected.len() * 68) as u64);
-    }
-
     #[test]
     fn test_bnb_exclude_negative_effective_value() {
         let utxos = get_test_utxos();