fixup! lightning: move no_std conditional into main lib

lightning/src/chain/chainmonitor.rs

@@ -42,7 +42,8 @@ use util::logger::Logger;
 use util::events;
 use util::events::Event;
 
-use crate::{HashMap, hash_map, ops::Deref};
+use crate::{HashMap, hash_map};
+use core::ops::Deref;
 use std::sync::RwLock;
 
 /// An implementation of [`chain::Watch`] for monitoring channels.

lightning/src/chain/channelmonitor.rs

@@ -51,7 +51,11 @@ use util::ser::{Readable, ReadableArgs, MaybeReadable, Writer, Writeable, U48};
 use util::byte_utils;
 use util::events::Event;
 
-use crate::{HashMap, HashSet, cmp, hash_map, mem, ops::Deref};
+#[cfg(feature = "no_std")]
+#[macro_use]
+use alloc::{boxed::Box, vec, vec::Vec};
+use crate::{HashMap, HashSet, hash_map};
+use core::{cmp, mem, ops::Deref};
 use std::io::Error;
 use std::sync::Mutex;
 
@@ -85,7 +89,7 @@ pub struct ChannelMonitorUpdate {
 /// then we allow the `ChannelManager` to send a `ChannelMonitorUpdate` with this update ID,
 /// with the update providing said payment preimage. No other update types are allowed after
 /// force-close.
-pub const CLOSED_CHANNEL_UPDATE_ID: u64 = crate::u64::MAX;
+pub const CLOSED_CHANNEL_UPDATE_ID: u64 = ::core::u64::MAX;
 
 impl Writeable for ChannelMonitorUpdate {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
@@ -101,7 +105,7 @@ impl Readable for ChannelMonitorUpdate {
 	fn read<R: ::std::io::Read>(r: &mut R) -> Result<Self, DecodeError> {
 		let update_id: u64 = Readable::read(r)?;
 		let len: u64 = Readable::read(r)?;
-		let mut updates = Vec::with_capacity(cmp::min(len as usize, MAX_ALLOC_SIZE / ::std::mem::size_of::<ChannelMonitorUpdateStep>()));
+		let mut updates = Vec::with_capacity(cmp::min(len as usize, MAX_ALLOC_SIZE / ::core::mem::size_of::<ChannelMonitorUpdateStep>()));
 		for _ in 0..len {
 			updates.push(Readable::read(r)?);
 		}
@@ -1819,7 +1823,7 @@ impl<Signer: Sign> ChannelMonitorImpl<Signer> {
 
 		for &(ref htlc, _, _) in holder_tx.htlc_outputs.iter() {
 			if let Some(transaction_output_index) = htlc.transaction_output_index {
-				claim_requests.push(ClaimRequest { absolute_timelock: crate::u32::MAX, aggregable: false, outpoint: BitcoinOutPoint { txid: holder_tx.txid, vout: transaction_output_index as u32 },
+				claim_requests.push(ClaimRequest { absolute_timelock: ::core::u32::MAX, aggregable: false, outpoint: BitcoinOutPoint { txid: holder_tx.txid, vout: transaction_output_index as u32 },
 					witness_data: InputMaterial::HolderHTLC {
 						preimage: if !htlc.offered {
 								if let Some(preimage) = self.payment_preimages.get(&htlc.payment_hash) {
@@ -2367,7 +2371,7 @@ impl<Signer: Sign> ChannelMonitorImpl<Signer> {
 	fn is_paying_spendable_output<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) where L::Target: Logger {
 		let mut spendable_output = None;
 		for (i, outp) in tx.output.iter().enumerate() { // There is max one spendable output for any channel tx, including ones generated by us
-			if i > crate::u16::MAX as usize {
+			if i > ::core::u16::MAX as usize {
 				// While it is possible that an output exists on chain which is greater than the
 				// 2^16th output in a given transaction, this is only possible if the output is not
 				// in a lightning transaction and was instead placed there by some third party who

lightning/src/chain/keysinterface.rs

@@ -36,7 +36,11 @@ use ln::chan_utils;
 use ln::chan_utils::{HTLCOutputInCommitment, make_funding_redeemscript, ChannelPublicKeys, HolderCommitmentTransaction, ChannelTransactionParameters, CommitmentTransaction};
 use ln::msgs::UnsignedChannelAnnouncement;
 
-use crate::{HashSet, atomic::{AtomicUsize, Ordering}};
+#[cfg(feature = "no_std")]
+#[macro_use]
+use alloc::{vec, vec::Vec};
+use crate::HashSet;
+use core::sync::atomic::{AtomicUsize, Ordering};
 use std::io::Error;
 use ln::msgs::{DecodeError, MAX_VALUE_MSAT};
 
@@ -832,7 +836,7 @@ impl KeysManager {
 	/// onchain output detection for which a corresponding delayed_payment_key must be derived.
 	pub fn derive_channel_keys(&self, channel_value_satoshis: u64, params: &[u8; 32]) -> InMemorySigner {
 		let chan_id = byte_utils::slice_to_be64(&params[0..8]);
-		assert!(chan_id <= crate::u32::MAX as u64); // Otherwise the params field wasn't created by us
+		assert!(chan_id <= core::u32::MAX as u64); // Otherwise the params field wasn't created by us
 		let mut unique_start = Sha256::engine();
 		unique_start.input(params);
 		unique_start.input(&self.seed);
@@ -1014,7 +1018,7 @@ impl KeysInterface for KeysManager {
 
 	fn get_channel_signer(&self, _inbound: bool, channel_value_satoshis: u64) -> Self::Signer {
 		let child_ix = self.channel_child_index.fetch_add(1, Ordering::AcqRel);
-		assert!(child_ix <= crate::u32::MAX as usize);
+		assert!(child_ix <= core::u32::MAX as usize);
 		let mut id = [0; 32];
 		id[0..8].copy_from_slice(&byte_utils::be64_to_array(child_ix as u64));
 		id[8..16].copy_from_slice(&byte_utils::be64_to_array(self.starting_time_nanos as u64));

lightning/src/chain/mod.rs

@@ -9,6 +9,9 @@
 
 //! Structs and traits which allow other parts of rust-lightning to interact with the blockchain.
 
+#[cfg(feature = "no_std")]
+use alloc::vec::Vec;
+
 use bitcoin::blockdata::block::{Block, BlockHeader};
 use bitcoin::blockdata::script::Script;
 use bitcoin::blockdata::transaction::TxOut;
@@ -137,7 +140,7 @@ pub trait Filter: Send + Sync {
 	fn register_output(&self, outpoint: &OutPoint, script_pubkey: &Script);
 }
 
-impl<T: Listen> Listen for crate::ops::Deref<Target = T> {
+impl<T: Listen> Listen for core::ops::Deref<Target = T> {
 	fn block_connected(&self, block: &Block, height: u32) {
 		(**self).block_connected(block, height);
 	}
@@ -147,7 +150,7 @@ impl<T: Listen> Listen for crate::ops::Deref<Target = T> {
 	}
 }
 
-impl<T: crate::ops::Deref, U: crate::ops::Deref> Listen for (T, U)
+impl<T: core::ops::Deref, U: core::ops::Deref> Listen for (T, U)
 where
 	T::Target: Listen,
 	U::Target: Listen,

lightning/src/lib.rs

@@ -20,6 +20,7 @@
 
 #![cfg_attr(not(any(feature = "fuzztarget", feature = "_test_utils")), deny(missing_docs))]
 #![cfg_attr(not(any(test, feature = "fuzztarget", feature = "_test_utils")), forbid(unsafe_code))]
+#![cfg_attr(feature = "no_std", no_std)]
 
 // In general, rust is absolutely horrid at supporting users doing things like,
 // for example, compiling Rust code for real environments. Disable useless lints
@@ -35,14 +36,9 @@ extern crate bitcoin;
 #[cfg(any(test, feature = "fuzztarget", feature = "_test_utils"))] extern crate regex;
 
 #[cfg(feature = "no_std")] extern crate alloc;
-#[cfg(feature = "no_std")] extern crate core;
+#[cfg(not(feature = "no_std"))] extern crate core;
 #[cfg(feature = "no_std")] extern crate hashbrown;
 
-#[cfg(feature = "no_std")]
-use core::{cell, cmp, default, fmt, hash, iter, marker, mem, ops, sync::atomic, time, u16, u32, u64, usize};
-#[cfg(not(feature = "no_std"))]
-use std::{cell, cmp, default, fmt, hash, iter, marker, mem, ops, sync::atomic, time, u16, u32, u64, usize};
-
 #[cfg(feature = "no_std")]
 use hashbrown::{HashMap, HashSet, hash_map};
 #[cfg(feature = "no_std")]

lightning/src/ln/chan_utils.rs

@@ -31,13 +31,16 @@ use bitcoin::secp256k1::{Secp256k1, Signature, Message};
 use bitcoin::secp256k1::Error as SecpError;
 use bitcoin::secp256k1;
 
-use crate::{cmp, ops::Deref};
+use core::{cmp, ops::Deref};
 use ln::chan_utils;
 use util::transaction_utils::sort_outputs;
 use ln::channel::INITIAL_COMMITMENT_NUMBER;
 use std::io::Read;
 use chain;
 
+#[cfg(feature = "no_std")]
+use alloc::vec::Vec;
+
 const HTLC_OUTPUT_IN_COMMITMENT_SIZE: usize = 1 + 8 + 4 + 32 + 5;
 
 pub(crate) const MAX_HTLCS: u16 = 483;

lightning/src/ln/channel.rs

@@ -38,12 +38,16 @@ use util::logger::Logger;
 use util::errors::APIError;
 use util::config::{UserConfig,ChannelConfig};
 
-use crate::{cmp, mem, fmt, ops::Deref};
+use core::{cmp, mem, fmt, ops::Deref};
 #[cfg(any(test, feature = "fuzztarget"))]
 use std::sync::Mutex;
 use bitcoin::hashes::hex::ToHex;
 use bitcoin::blockdata::opcodes::all::OP_PUSHBYTES_0;
 
+#[cfg(feature = "no_std")]
+#[macro_use]
+use alloc::{format, boxed::Box, string::String, vec, vec::Vec};
+
 #[cfg(test)]
 pub struct ChannelValueStat {
 	pub value_to_self_msat: u64,
@@ -1189,7 +1193,7 @@ impl<Signer: Sign> Channel<Signer> {
 		// on-chain ChannelsMonitors during block rescan. Ideally we'd figure out a way to drop
 		// these, but for now we just have to treat them as normal.
 
-		let mut pending_idx = crate::usize::MAX;
+		let mut pending_idx = core::usize::MAX;
 		for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
 			if htlc.htlc_id == htlc_id_arg {
 				assert_eq!(htlc.payment_hash, payment_hash_calc);
@@ -1212,7 +1216,7 @@ impl<Signer: Sign> Channel<Signer> {
 				break;
 			}
 		}
-		if pending_idx == crate::usize::MAX {
+		if pending_idx == core::usize::MAX {
 			return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID".to_owned()));
 		}
 
@@ -1311,7 +1315,7 @@ impl<Signer: Sign> Channel<Signer> {
 		// on-chain ChannelsMonitors during block rescan. Ideally we'd figure out a way to drop
 		// these, but for now we just have to treat them as normal.
 
-		let mut pending_idx = crate::usize::MAX;
+		let mut pending_idx = core::usize::MAX;
 		for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
 			if htlc.htlc_id == htlc_id_arg {
 				match htlc.state {
@@ -1328,7 +1332,7 @@ impl<Signer: Sign> Channel<Signer> {
 				pending_idx = idx;
 			}
 		}
-		if pending_idx == crate::usize::MAX {
+		if pending_idx == core::usize::MAX {
 			return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID".to_owned()));
 		}
 
@@ -4281,8 +4285,8 @@ impl<Signer: Sign> Writeable for Channel<Signer> {
 
 		let mut key_data = VecWriter(Vec::new());
 		self.holder_signer.write(&mut key_data)?;
-		assert!(key_data.0.len() < crate::usize::MAX);
-		assert!(key_data.0.len() < crate::u32::MAX as usize);
+		assert!(key_data.0.len() < core::usize::MAX);
+		assert!(key_data.0.len() < core::u32::MAX as usize);
 		(key_data.0.len() as u32).write(writer)?;
 		writer.write_all(&key_data.0[..])?;
 

lightning/src/ln/channelmanager.rs

@@ -55,15 +55,16 @@ use util::chacha20::{ChaCha20, ChaChaReader};
 use util::logger::Logger;
 use util::errors::APIError;
 
-use crate::{
-    HashMap,
-    HashSet,
+#[cfg(feature = "no_std")]
+#[macro_use]
+use alloc::{format, vec, vec::Vec};
+use crate::{HashMap, HashSet, hash_map}; 
+use core::{
     cmp,
-    hash_map,
     mem,
     marker::{Sync, Send},
     ops::Deref,
-    atomic::{AtomicUsize, Ordering},
+    sync::atomic::{AtomicUsize, Ordering},
     time::Duration,
 };
 use std::io::{Cursor, Read};
@@ -1583,7 +1584,7 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 	// be absurd. We ensure this by checking that at least 500 (our stated public contract on when
 	// broadcast_node_announcement panics) of the maximum-length addresses would fit in a 64KB
 	// message...
-	const HALF_MESSAGE_IS_ADDRS: u32 = crate::u16::MAX as u32 / (NetAddress::MAX_LEN as u32 + 1) / 2;
+	const HALF_MESSAGE_IS_ADDRS: u32 = core::u16::MAX as u32 / (NetAddress::MAX_LEN as u32 + 1) / 2;
 	#[deny(const_err)]
 	#[allow(dead_code)]
 	// ...by failing to compile if the number of addresses that would be half of a message is

lightning/src/ln/features.rs

@@ -25,11 +25,14 @@
 //! [`Features`]: struct.Features.html
 //! [`Context`]: sealed/trait.Context.html
 
-use crate::{cmp, fmt, marker::PhantomData};
+use core::{cmp, fmt, marker::PhantomData};
 
 use ln::msgs::DecodeError;
 use util::ser::{Readable, Writeable, Writer};
 
+#[cfg(feature = "no_std")]
+use alloc::vec::Vec;
+
 mod sealed {
 	use ln::features::Features;
 
@@ -197,42 +200,34 @@ mod sealed {
 
 				/// Returns whether the feature is required by the given flags.
 				#[inline]
-				fn requires_feature(flags: &Vec<u8>) -> bool {
+				fn requires_feature(flags: &[u8]) -> bool {
 					flags.len() > Self::BYTE_OFFSET &&
 						(flags[Self::BYTE_OFFSET] & Self::REQUIRED_MASK) != 0
 				}
 
 				/// Returns whether the feature is supported by the given flags.
 				#[inline]
-				fn supports_feature(flags: &Vec<u8>) -> bool {
+				fn supports_feature(flags: &[u8]) -> bool {
 					flags.len() > Self::BYTE_OFFSET &&
 						(flags[Self::BYTE_OFFSET] & (Self::REQUIRED_MASK | Self::OPTIONAL_MASK)) != 0
 				}
 
 				/// Sets the feature's required (even) bit in the given flags.
 				#[inline]
-				fn set_required_bit(flags: &mut Vec<u8>) {
-					if flags.len() <= Self::BYTE_OFFSET {
-						flags.resize(Self::BYTE_OFFSET + 1, 0u8);
-					}
-
+				fn set_required_bit(flags: &mut [u8]) {
 					flags[Self::BYTE_OFFSET] |= Self::REQUIRED_MASK;
 				}
 
 				/// Sets the feature's optional (odd) bit in the given flags.
 				#[inline]
-				fn set_optional_bit(flags: &mut Vec<u8>) {
-					if flags.len() <= Self::BYTE_OFFSET {
-						flags.resize(Self::BYTE_OFFSET + 1, 0u8);
-					}
-
+				fn set_optional_bit(flags: &mut [u8]) {
 					flags[Self::BYTE_OFFSET] |= Self::OPTIONAL_MASK;
 				}
 
 				/// Clears the feature's required (even) and optional (odd) bits from the given
 				/// flags.
 				#[inline]
-				fn clear_bits(flags: &mut Vec<u8>) {
+				fn clear_bits(flags: &mut [u8]) {
 					if flags.len() > Self::BYTE_OFFSET {
 						flags[Self::BYTE_OFFSET] &= !Self::REQUIRED_MASK;
 						flags[Self::BYTE_OFFSET] &= !Self::OPTIONAL_MASK;

lightning/src/ln/functional_test_utils.rs

@@ -40,7 +40,8 @@ use bitcoin::secp256k1::key::PublicKey;
 
 use std::rc::Rc;
 use std::sync::Mutex;
-use crate::{HashMap, cell::RefCell, mem};
+use core::{cell::RefCell, mem};
+use crate::HashMap;
 
 pub const CHAN_CONFIRM_DEPTH: u32 = 100;
 

lightning/src/ln/functional_tests.rs

@@ -48,7 +48,8 @@ use bitcoin::secp256k1::key::{PublicKey,SecretKey};
 use regex;
 
 use std::sync::Mutex;
-use crate::{BTreeSet, HashMap, HashSet, atomic::Ordering, default::Default};
+use core::{sync::atomic::Ordering, default::Default};
+use crate::{BTreeSet, HashMap, HashSet};
 
 use ln::functional_test_utils::*;
 use ln::chan_utils::CommitmentTransaction;

lightning/src/ln/msgs.rs

@@ -32,7 +32,10 @@ use bitcoin::hash_types::{Txid, BlockHash};
 
 use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
 
-use crate::{cmp, fmt::{self, Debug}};
+#[cfg(feature = "no_std")]
+#[macro_use]
+use alloc::{vec, vec::Vec};
+use core::{cmp, fmt::{self, Debug}};
 use std::io::Read;
 
 use util::events::MessageSendEventsProvider;

lightning/src/ln/onchaintx.rs

@@ -32,7 +32,12 @@ use util::logger::Logger;
 use util::ser::{Readable, ReadableArgs, Writer, Writeable, VecWriter};
 use util::byte_utils;
 
-use crate::{HashMap, hash_map, cmp, mem::replace, ops::Deref};
+use crate::{HashMap, hash_map};
+use core::{cmp, mem::replace, ops::Deref};
+
+#[cfg(feature = "no_std")]
+#[macro_use]
+use alloc::{vec, vec::Vec};
 
 const MAX_ALLOC_SIZE: usize = 64*1024;
 
@@ -296,8 +301,8 @@ impl<ChannelSigner: Sign> OnchainTxHandler<ChannelSigner> {
 
 		let mut key_data = VecWriter(Vec::new());
 		self.signer.write(&mut key_data)?;
-		assert!(key_data.0.len() < crate::usize::MAX);
-		assert!(key_data.0.len() < crate::u32::MAX as usize);
+		assert!(key_data.0.len() < core::usize::MAX);
+		assert!(key_data.0.len() < core::u32::MAX as usize);
 		(key_data.0.len() as u32).write(writer)?;
 		writer.write_all(&key_data.0[..])?;
 
@@ -689,7 +694,7 @@ impl<ChannelSigner: Sign> OnchainTxHandler<ChannelSigner> {
 		log_trace!(logger, "Updating claims view at height {} with {} matched transactions and {} claim requests", height, txn_matched.len(), claimable_outpoints.len());
 		let mut new_claims = Vec::new();
 		let mut aggregated_claim = HashMap::new();
-		let mut aggregated_soonest = crate::u32::MAX;
+		let mut aggregated_soonest = core::u32::MAX;
 
 		// Try to aggregate outputs if their timelock expiration isn't imminent (absolute_timelock
 		// <= CLTV_SHARED_CLAIM_BUFFER) and they don't require an immediate nLockTime (aggregable).

lightning/src/ln/onion_route_tests.rs

@@ -32,7 +32,7 @@ use bitcoin::hashes::Hash;
 use bitcoin::secp256k1::Secp256k1;
 use bitcoin::secp256k1::key::SecretKey;
 
-use crate::{atomic::Ordering, default::Default};
+use core::{sync::atomic::Ordering, default::Default};
 use std::io;
 
 use ln::functional_test_utils::*;