rust-lightning/lightning-c-bindings/demo.cpp

extern "C" {
#include "include/rust_types.h"
#include "include/lightning.h"
}
#include "include/lightningpp.hpp"

#include <assert.h>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>

#include <atomic>
#include <chrono>
#include <functional>
#include <thread>
#include <mutex>
#include <vector>

const uint8_t valid_node_announcement[] = {
	0x94, 0xe4, 0xf5, 0x61, 0x41, 0x24, 0x7d, 0x90, 0x23, 0xa0, 0xc8, 0x34, 0x8c, 0xc4, 0xca, 0x51,
	0xd8, 0x17, 0x59, 0xff, 0x7d, 0xac, 0x8c, 0x9b, 0x63, 0x29, 0x1c, 0xe6, 0x12, 0x12, 0x93, 0xbd,
	0x66, 0x4d, 0x6b, 0x9c, 0xfb, 0x35, 0xda, 0x16, 0x06, 0x3d, 0xf0, 0x8f, 0x8a, 0x39, 0x99, 0xa2,
	0xf2, 0x5d, 0x12, 0x0f, 0x2b, 0x42, 0x1b, 0x8b, 0x9a, 0xfe, 0x33, 0x0c, 0xeb, 0x33, 0x5e, 0x52,
	0xee, 0x99, 0xa1, 0x07, 0x06, 0xed, 0xf8, 0x48, 0x7a, 0xc6, 0xe5, 0xf5, 0x5e, 0x01, 0x3a, 0x41,
	0x2f, 0x18, 0x94, 0x8a, 0x3b, 0x0a, 0x52, 0x3f, 0xbf, 0x61, 0xa9, 0xc5, 0x4f, 0x70, 0xee, 0xb8,
	0x79, 0x23, 0xbb, 0x1a, 0x44, 0x7d, 0x91, 0xe6, 0x2a, 0xbc, 0xa1, 0x07, 0xbc, 0x65, 0x3b, 0x02,
	0xd9, 0x1d, 0xb2, 0xf2, 0x3a, 0xcb, 0x75, 0x79, 0xc6, 0x66, 0xd8, 0xc1, 0x71, 0x29, 0xdf, 0x04,
	0x60, 0xf4, 0xbf, 0x07, 0x7b, 0xb9, 0xc2, 0x11, 0x94, 0x6a, 0x28, 0xc2, 0xdd, 0xd8, 0x7b, 0x44,
	0x8f, 0x08, 0xe3, 0xc8, 0xd8, 0xf4, 0x81, 0xb0, 0x9f, 0x94, 0xcb, 0xc8, 0xc1, 0x3c, 0xc2, 0x6e,
	0x31, 0x26, 0xfc, 0x33, 0x16, 0x3b, 0xe0, 0xde, 0xa1, 0x16, 0x21, 0x9f, 0x89, 0xdd, 0x97, 0xa4,
	0x41, 0xf2, 0x9f, 0x19, 0xb1, 0xae, 0x82, 0xf7, 0x85, 0x9a, 0xb7, 0x8f, 0xb7, 0x52, 0x7a, 0x72,
	0xf1, 0x5e, 0x89, 0xe1, 0x8a, 0xcd, 0x40, 0xb5, 0x8e, 0xc3, 0xca, 0x42, 0x76, 0xa3, 0x6e, 0x1b,
	0xf4, 0x87, 0x35, 0x30, 0x58, 0x43, 0x04, 0xd9, 0x2c, 0x50, 0x54, 0x55, 0x47, 0x6f, 0x70, 0x9b,
	0x42, 0x1f, 0x91, 0xfc, 0xa1, 0xdb, 0x72, 0x53, 0x96, 0xc8, 0xe5, 0xcd, 0x0e, 0xcb, 0xa0, 0xfe,
	0x6b, 0x08, 0x77, 0x48, 0xb7, 0xad, 0x4a, 0x69, 0x7c, 0xdc, 0xd8, 0x04, 0x28, 0x35, 0x9b, 0x73,
	0x00, 0x00, 0x43, 0x49, 0x7f, 0xd7, 0xf8, 0x26, 0x95, 0x71, 0x08, 0xf4, 0xa3, 0x0f, 0xd9, 0xce,
	0xc3, 0xae, 0xba, 0x79, 0x97, 0x20, 0x84, 0xe9, 0x0e, 0xad, 0x01, 0xea, 0x33, 0x09, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x5b, 0xe5, 0xe9, 0x47, 0x82,
	0x09, 0x67, 0x4a, 0x96, 0xe6, 0x0f, 0x1f, 0x03, 0x7f, 0x61, 0x76, 0x54, 0x0f, 0xd0, 0x01, 0xfa,
	0x1d, 0x64, 0x69, 0x47, 0x70, 0xc5, 0x6a, 0x77, 0x09, 0xc4, 0x2c, 0x03, 0x5c, 0x4e, 0x0d, 0xec,
	0x72, 0x15, 0xe2, 0x68, 0x33, 0x93, 0x87, 0x30, 0xe5, 0xe5, 0x05, 0xaa, 0x62, 0x50, 0x4d, 0xa8,
	0x5b, 0xa5, 0x71, 0x06, 0xa4, 0x6b, 0x5a, 0x24, 0x04, 0xfc, 0x9d, 0x8e, 0x02, 0xba, 0x72, 0xa6,
	0xe8, 0xba, 0x53, 0xe8, 0xb9, 0x71, 0xad, 0x0c, 0x98, 0x23, 0x96, 0x8a, 0xef, 0x4d, 0x78, 0xce,
	0x8a, 0xf2, 0x55, 0xab, 0x43, 0xdf, 0xf8, 0x30, 0x03, 0xc9, 0x02, 0xfb, 0x8d, 0x02, 0x16, 0x34,
	0x5b, 0xf8, 0x31, 0x16, 0x4a, 0x03, 0x75, 0x8e, 0xae, 0xa5, 0xe8, 0xb6, 0x6f, 0xee, 0x2b, 0xe7,
	0x71, 0x0b, 0x8f, 0x19, 0x0e, 0xe8, 0x80, 0x24, 0x90, 0x32, 0xa2, 0x9e, 0xd6, 0x6e
};

// A simple block containing only one transaction (which is the channel-open transaction for the
// channel we'll create). This was originally created by printing additional data in a simple
// rust-lightning unit test.
const uint8_t channel_open_header[80] = {
	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0xa2, 0x47, 0xd2, 0xf8, 0xd4, 0xe0, 0x6a, 0x3f, 0xf9, 0x7a, 0x9a, 0x34,
	0xbb, 0xa9, 0x96, 0xde, 0x63, 0x84, 0x5a, 0xce, 0xcf, 0x98, 0xb8, 0xbb, 0x75, 0x4c, 0x4f, 0x7d,
	0xee, 0x4c, 0xa9, 0x5f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

const uint8_t channel_open_tx[] = {
	0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x01, 0x40, 0x9c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x22, 0x00, 0x20, 0x20, 0x12, 0x70, 0x44,
	0x41, 0x40, 0xaf, 0xc5, 0x72, 0x97, 0xc8, 0x69, 0xba, 0x04, 0xdb, 0x28, 0x7b, 0xd7, 0x32, 0x07,
	0x33, 0x3a, 0x4a, 0xc2, 0xc5, 0x56, 0x06, 0x05, 0x65, 0xd7, 0xa8, 0xcf, 0x01, 0x00, 0x00, 0x00,
	0x00, 0x00
};

// The first transaction in the block is header (80 bytes) + transaction count (1 byte) into the block data.
const uint8_t channel_open_txid[] = {
	0x5f, 0xa9, 0x4c, 0xee, 0x7d, 0x4f, 0x4c, 0x75, 0xbb, 0xb8, 0x98, 0xcf, 0xce, 0x5a, 0x84, 0x63,
	0xde, 0x96, 0xa9, 0xbb, 0x34, 0x9a, 0x7a, 0xf9, 0x3f, 0x6a, 0xe0, 0xd4, 0xf8, 0xd2, 0x47, 0xa2
};

// Two blocks built on top of channel_open_block:
const uint8_t header_1[80] = {
	0x01, 0x00, 0x00, 0x00, 0x65, 0x8e, 0xf1, 0x90, 0x88, 0xfa, 0x13, 0x9c, 0x6a, 0xea, 0xf7, 0xc1,
	0x5a, 0xdd, 0x52, 0x4d, 0x3c, 0x48, 0x03, 0xb3, 0x9b, 0x25, 0x4f, 0x02, 0x79, 0x05, 0x90, 0xe0,
	0xc4, 0x8d, 0xa0, 0x62, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
const uint8_t header_2[80] = {
	0x01, 0x00, 0x00, 0x00, 0xf2, 0x08, 0x87, 0x51, 0xcb, 0xb1, 0x1a, 0x51, 0x76, 0x01, 0x6c, 0x5d,
	0x76, 0x26, 0x54, 0x6f, 0xd9, 0xbd, 0xa6, 0xa5, 0xe9, 0x4b, 0x21, 0x6e, 0xda, 0xa3, 0x64, 0x23,
	0xcd, 0xf1, 0xe2, 0xe2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

const LDKThirtyTwoBytes payment_preimage_1 = {
	.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1 }
};
const LDKThirtyTwoBytes payment_hash_1 = {
	.data = {
		0xdc, 0xb1, 0xac, 0x4a, 0x5d, 0xe3, 0x70, 0xca, 0xd0, 0x91, 0xc1, 0x3f, 0x13, 0xae, 0xe2, 0xf9,
		0x36, 0xc2, 0x78, 0xfa, 0x05, 0xd2, 0x64, 0x65, 0x3c, 0x0c, 0x13, 0x21, 0x85, 0x2a, 0x35, 0xe8
	}
};

const LDKThirtyTwoBytes genesis_hash = { // We don't care particularly if this is "right"
	.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1 }
};

void print_log(const void *this_arg, const char *record) {
	printf("%p - %s\n", this_arg, record);
}

uint32_t get_fee(const void *this_arg, LDKConfirmationTarget target) {
	if (target == LDKConfirmationTarget_Background) {
		return 253;
	} else {
		return 507;
	}
	// Note that we don't call _free() on target, but that's OK, its unitary
}
// We use the same fee estimator globally:
const LDKFeeEstimator fee_est {
	.this_arg = NULL,
	.get_est_sat_per_1000_weight = get_fee,
	.free = NULL,
};

static std::atomic_int num_txs_broadcasted(0);
void broadcast_tx(const void *this_arg, LDKTransaction tx) {
	num_txs_broadcasted += 1;
	//TODO
	Transaction_free(tx);
}

struct NodeMonitors {
	std::mutex mut;
	std::vector<std::pair<LDK::OutPoint, LDK::ChannelMonitor>> mons;
	LDKLogger* logger;

	void ConnectBlock(const uint8_t (*header)[80], uint32_t height, LDKCVec_C2Tuple_usizeTransactionZZ tx_data, LDKBroadcasterInterface broadcast, LDKFeeEstimator fee_est) {
		std::unique_lock<std::mutex> l(mut);
		for (auto& mon : mons) {
			LDK::CVec_C2Tuple_TxidCVec_C2Tuple_u32TxOutZZZZ res = ChannelMonitor_block_connected(&mon.second, &header_2, tx_data, height, broadcast, fee_est, *logger);
		}
	}
};

LDKCResult_NoneChannelMonitorUpdateErrZ add_channel_monitor(const void *this_arg, LDKOutPoint funding_txo_arg, LDKChannelMonitor monitor_arg) {
	// First bind the args to C++ objects so they auto-free
	LDK::ChannelMonitor mon(std::move(monitor_arg));
	LDK::OutPoint funding_txo(std::move(funding_txo_arg));

	NodeMonitors* arg = (NodeMonitors*) this_arg;
	std::unique_lock<std::mutex> l(arg->mut);

	arg->mons.push_back(std::make_pair(std::move(funding_txo), std::move(mon)));
	return CResult_NoneChannelMonitorUpdateErrZ_ok();
}
static std::atomic_int mons_updated(0);
LDKCResult_NoneChannelMonitorUpdateErrZ update_channel_monitor(const void *this_arg, LDKOutPoint funding_txo_arg, LDKChannelMonitorUpdate monitor_arg) {
	// First bind the args to C++ objects so they auto-free
	LDK::ChannelMonitorUpdate update(std::move(monitor_arg));
	LDK::OutPoint funding_txo(std::move(funding_txo_arg));

	NodeMonitors* arg = (NodeMonitors*) this_arg;
	std::unique_lock<std::mutex> l(arg->mut);

	bool updated = false;
	for (auto& mon : arg->mons) {
		if (OutPoint_get_index(&mon.first) == OutPoint_get_index(&funding_txo) &&
				!memcmp(OutPoint_get_txid(&mon.first), OutPoint_get_txid(&funding_txo), 32)) {
			updated = true;
			LDKBroadcasterInterface broadcaster = {
				.broadcast_transaction = broadcast_tx,
			};
			LDK::CResult_NoneMonitorUpdateErrorZ res = ChannelMonitor_update_monitor(&mon.second, &update, &broadcaster, &fee_est, arg->logger);
			assert(res->result_ok);
		}
	}
	assert(updated);

	mons_updated += 1;
	return CResult_NoneChannelMonitorUpdateErrZ_ok();
}
LDKCVec_MonitorEventZ monitors_pending_monitor_events(const void *this_arg) {
	NodeMonitors* arg = (NodeMonitors*) this_arg;
	std::unique_lock<std::mutex> l(arg->mut);

	if (arg->mons.size() == 0) {
		return LDKCVec_MonitorEventZ {
			.data = NULL,
			.datalen = 0,
		};
	} else {
		// We only ever actually have one channel per node, plus concatenating two
		// Rust Vecs to each other from C++ will require a bit of effort.
		assert(arg->mons.size() == 1);
		return ChannelMonitor_get_and_clear_pending_monitor_events(&arg->mons[0].second);
	}
}

uintptr_t sock_send_data(void *this_arg, LDKu8slice data, bool resume_read) {
	return write((int)((long)this_arg), data.data, data.datalen);
}
void sock_disconnect_socket(void *this_arg) {
	close((int)((long)this_arg));
}
bool sock_eq(const void *this_arg, const LDKSocketDescriptor *other_arg) {
	return this_arg == other_arg->this_arg;
}
uint64_t sock_hash(const void *this_arg) {
	return (uint64_t)this_arg;
}
void sock_read_data_thread(int rdfd, LDKSocketDescriptor *peer_descriptor, LDKPeerManager *pm) {
	unsigned char buf[1024];
	LDKu8slice data;
	data.data = buf;
	ssize_t readlen = 0;
	while ((readlen = read(rdfd, buf, 1024)) > 0) {
		data.datalen = readlen;
		LDK::CResult_boolPeerHandleErrorZ res = PeerManager_read_event(&*pm, peer_descriptor, data);
		if (!res->result_ok) {
			peer_descriptor->disconnect_socket(peer_descriptor->this_arg);
			return;
		}
		PeerManager_process_events(pm);
	}
	PeerManager_socket_disconnected(&*pm, peer_descriptor);
}

class PeersConnection {
	int pipefds_1_to_2[2];
	int pipefds_2_to_1[2];
	std::thread t1, t2;
	LDKSocketDescriptor sock1, sock2;

public:
	PeersConnection(LDK::ChannelManager& cm1, LDK::ChannelManager& cm2, LDK::PeerManager& net1, LDK::PeerManager& net2) {
		assert(!pipe(pipefds_1_to_2));
		assert(!pipe(pipefds_2_to_1));

		sock1 = LDKSocketDescriptor {
			.this_arg = (void*)(long)pipefds_1_to_2[1],
			.send_data = sock_send_data,
			.disconnect_socket = sock_disconnect_socket,
			.eq = sock_eq,
			.hash = sock_hash,
			.clone = NULL,
			.free = NULL,
		};

		sock2 = LDKSocketDescriptor {
			.this_arg = (void*)(long)pipefds_2_to_1[1],
			.send_data = sock_send_data,
			.disconnect_socket = sock_disconnect_socket,
			.eq = sock_eq,
			.hash = sock_hash,
			.clone = NULL,
			.free = NULL,
		};

		t1 = std::thread(&sock_read_data_thread, pipefds_2_to_1[0], &sock1, &net1);
		t2 = std::thread(&sock_read_data_thread, pipefds_1_to_2[0], &sock2, &net2);

		// Note that we have to bind the result to a C++ class to make sure it gets free'd
		LDK::CResult_CVec_u8ZPeerHandleErrorZ con_res = PeerManager_new_outbound_connection(&net1, ChannelManager_get_our_node_id(&cm2), sock1);
		assert(con_res->result_ok);
		LDK::CResult_NonePeerHandleErrorZ con_res2 = PeerManager_new_inbound_connection(&net2, sock2);
		assert(con_res2->result_ok);

		auto writelen = write(pipefds_1_to_2[1], con_res->contents.result->data, con_res->contents.result->datalen);
		assert(writelen > 0 && uint64_t(writelen) == con_res->contents.result->datalen);

		while (true) {
			// Wait for the initial handshakes to complete...
			LDK::CVec_PublicKeyZ peers_1 = PeerManager_get_peer_node_ids(&net1);
			LDK::CVec_PublicKeyZ peers_2 = PeerManager_get_peer_node_ids(&net2);
			if (peers_1->datalen == 1 && peers_2->datalen ==1) { break; }
			std::this_thread::yield();
		}
	}

	void stop() {
		close(pipefds_1_to_2[0]);
		close(pipefds_2_to_1[0]);
		close(pipefds_1_to_2[1]);
		close(pipefds_2_to_1[1]);
		t1.join();
		t2.join();
	}
};

int main() {
	LDKPublicKey null_pk;
	memset(&null_pk, 0, sizeof(null_pk));

	LDKThirtyTwoBytes random_bytes;

	LDKNetwork network = LDKNetwork_Testnet;

	// Trait implementations:
	LDKBroadcasterInterface broadcast {
		.this_arg = NULL,
		.broadcast_transaction = broadcast_tx,
		.free = NULL,
	};

	// Instantiate classes for the nodes that don't get reloaded on a ser-des reload
	LDKLogger logger1 {
		.this_arg = (void*)1,
		.log = print_log,
		.free = NULL,
	};

	NodeMonitors mons1;
	mons1.logger = &logger1;
	LDKWatch mon1 {
		.this_arg = &mons1,
		.watch_channel = add_channel_monitor,
		.update_channel = update_channel_monitor,
		.release_pending_monitor_events = monitors_pending_monitor_events,
		.free = NULL,
	};

	LDK::NetGraphMsgHandler net_graph1 = NetGraphMsgHandler_new(genesis_hash, NULL, logger1);
	LDKSecretKey node_secret1;

	LDKLogger logger2 {
		.this_arg = (void*)2,
		.log = print_log,
		.free = NULL,
	};

	NodeMonitors mons2;
	mons2.logger = &logger2;
	LDKWatch mon2 {
		.this_arg = &mons2,
		.watch_channel = add_channel_monitor,
		.update_channel = update_channel_monitor,
		.release_pending_monitor_events = monitors_pending_monitor_events,
		.free = NULL,
	};

	LDK::NetGraphMsgHandler net_graph2 = NetGraphMsgHandler_new(genesis_hash, NULL, logger2);
	LDKSecretKey node_secret2;

	LDK::CVec_u8Z cm1_ser = LDKCVec_u8Z {}; // ChannelManager 1 serialization at the end of the ser-des scope
	LDK::CVec_u8Z cm2_ser = LDKCVec_u8Z {}; // ChannelManager 2 serialization at the end of the ser-des scope

	{ // Scope for the ser-des reload
		// Instantiate classes for node 1:
		uint8_t node_seed[32];
		memset(&node_seed, 0, 32);
		LDK::KeysManager keys1 = KeysManager_new(&node_seed, network, 0, 0);
		LDK::KeysInterface keys_source1 = KeysManager_as_KeysInterface(&keys1);
		node_secret1 = keys_source1->get_node_secret(keys_source1->this_arg);

		LDK::ChannelManager cm1 = ChannelManager_new(network, fee_est, mon1, broadcast, logger1, KeysManager_as_KeysInterface(&keys1), UserConfig_default(), 0);

		LDK::CVec_ChannelDetailsZ channels = ChannelManager_list_channels(&cm1);
		assert(channels->datalen == 0);

		LDK::MessageHandler msg_handler1 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm1), NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph1));

		random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
		LDK::PeerManager net1 = PeerManager_new(std::move(msg_handler1), node_secret1, &random_bytes.data, logger1);

		// Demo getting a channel key and check that its returning real pubkeys:
		LDK::ChannelKeys chan_keys1 = keys_source1->get_channel_keys(keys_source1->this_arg, false, 42);
		chan_keys1->set_pubkeys(&chan_keys1); // Make sure pubkeys is defined
		LDKPublicKey payment_point = ChannelPublicKeys_get_payment_point(&chan_keys1->pubkeys);
		assert(memcmp(&payment_point, &null_pk, sizeof(null_pk)));

		// Instantiate classes for node 2:
		memset(&node_seed, 1, 32);
		LDK::KeysManager keys2 = KeysManager_new(&node_seed, network, 0, 0);
		LDK::KeysInterface keys_source2 = KeysManager_as_KeysInterface(&keys2);
		node_secret2 = keys_source2->get_node_secret(keys_source2->this_arg);

		LDK::ChannelHandshakeConfig handshake_config2 = ChannelHandshakeConfig_default();
		ChannelHandshakeConfig_set_minimum_depth(&handshake_config2, 2);
		LDK::UserConfig config2 = UserConfig_default();
		UserConfig_set_own_channel_config(&config2, std::move(handshake_config2));

		LDK::ChannelManager cm2 = ChannelManager_new(network, fee_est, mon2, broadcast, logger2, KeysManager_as_KeysInterface(&keys2), std::move(config2), 0);

		LDK::CVec_ChannelDetailsZ channels2 = ChannelManager_list_channels(&cm2);
		assert(channels2->datalen == 0);

		LDK::RoutingMessageHandler net_msgs2 = NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph2);
		LDK::ChannelAnnouncement chan_ann = ChannelAnnouncement_read(LDKu8slice { .data = valid_node_announcement, .datalen = sizeof(valid_node_announcement) });
		LDK::CResult_boolLightningErrorZ ann_res = net_msgs2->handle_channel_announcement(net_msgs2->this_arg, &chan_ann);
		assert(ann_res->result_ok);

		LDK::MessageHandler msg_handler2 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm2), std::move(net_msgs2));

		random_bytes = keys_source2->get_secure_random_bytes(keys_source2->this_arg);
		LDK::PeerManager net2 = PeerManager_new(std::move(msg_handler2), node_secret2, &random_bytes.data, logger2);

		// Open a connection!
		PeersConnection conn(cm1, cm2, net1, net2);

		// Note that we have to bind the result to a C++ class to make sure it gets free'd
		LDK::CResult_NoneAPIErrorZ res = ChannelManager_create_channel(&cm1, ChannelManager_get_our_node_id(&cm2), 40000, 1000, 42, UserConfig_default());
		assert(res->result_ok);
		PeerManager_process_events(&net1);

		LDK::CVec_ChannelDetailsZ new_channels = ChannelManager_list_channels(&cm1);
		assert(new_channels->datalen == 1);
		LDKPublicKey chan_open_pk = ChannelDetails_get_remote_network_id(&new_channels->data[0]);
		assert(!memcmp(chan_open_pk.compressed_form, ChannelManager_get_our_node_id(&cm2).compressed_form, 33));

		while (true) {
			LDK::CVec_ChannelDetailsZ new_channels_2 = ChannelManager_list_channels(&cm2);
			if (new_channels_2->datalen == 1) {
				// Sample getting our counterparty's init features (which used to be hard to do without a memory leak):
				const LDK::InitFeatures init_feats = ChannelDetails_get_counterparty_features(&new_channels_2->data[0]);
				assert(init_feats->inner != NULL);
				break;
			}
			std::this_thread::yield();
		}

		LDKEventsProvider ev1 = ChannelManager_as_EventsProvider(&cm1);
		while (true) {
			LDK::CVec_EventZ events = ev1.get_and_clear_pending_events(ev1.this_arg);
			if (events->datalen == 1) {
				assert(events->data[0].tag == LDKEvent_FundingGenerationReady);
				assert(events->data[0].funding_generation_ready.user_channel_id == 42);
				assert(events->data[0].funding_generation_ready.channel_value_satoshis == 40000);
				assert(events->data[0].funding_generation_ready.output_script.datalen == 34);
				assert(!memcmp(events->data[0].funding_generation_ready.output_script.data, channel_open_tx + 58, 34));
				LDKThirtyTwoBytes txid;
				for (int i = 0; i < 32; i++) { txid.data[i] = channel_open_txid[31-i]; }
				LDK::OutPoint outp = OutPoint_new(txid, 0);
				ChannelManager_funding_transaction_generated(&cm1, &events->data[0].funding_generation_ready.temporary_channel_id.data, std::move(outp));
				break;
			}
			std::this_thread::yield();
		}

		// We observe when the funding signed messages have been exchanged by
		// waiting for two monitors to be registered.
		PeerManager_process_events(&net1);
		while (true) {
			LDK::CVec_EventZ events = ev1.get_and_clear_pending_events(ev1.this_arg);
			if (events->datalen == 1) {
				assert(events->data[0].tag == LDKEvent_FundingBroadcastSafe);
				assert(events->data[0].funding_broadcast_safe.user_channel_id == 42);
				break;
			}
			std::this_thread::yield();
		}

		LDKCVec_C2Tuple_usizeTransactionZZ txdata { .data = (LDKC2TupleTempl_usize__Transaction*)malloc(sizeof(LDKC2Tuple_usizeTransactionZ)), .datalen = 1 };
		*txdata.data = C2Tuple_usizeTransactionZ_new(0, LDKTransaction { .data = (uint8_t*)channel_open_tx, .datalen = sizeof(channel_open_tx), .data_is_owned = false });
		ChannelManager_block_connected(&cm1, &channel_open_header, txdata, 1);

		txdata = LDKCVec_C2Tuple_usizeTransactionZZ { .data = (LDKC2TupleTempl_usize__Transaction*)malloc(sizeof(LDKC2Tuple_usizeTransactionZ)), .datalen = 1 };
		*txdata.data = C2Tuple_usizeTransactionZ_new(0, LDKTransaction { .data = (uint8_t*)channel_open_tx, .datalen = sizeof(channel_open_tx), .data_is_owned = false });
		ChannelManager_block_connected(&cm2, &channel_open_header, txdata, 1);

		txdata = LDKCVec_C2Tuple_usizeTransactionZZ { .data = (LDKC2TupleTempl_usize__Transaction*)malloc(sizeof(LDKC2Tuple_usizeTransactionZ)), .datalen = 1 };
		*txdata.data = C2Tuple_usizeTransactionZ_new(0, LDKTransaction { .data = (uint8_t*)channel_open_tx, .datalen = sizeof(channel_open_tx), .data_is_owned = false });
		mons1.ConnectBlock(&channel_open_header, 1, txdata, broadcast, fee_est);

		txdata = LDKCVec_C2Tuple_usizeTransactionZZ { .data = (LDKC2TupleTempl_usize__Transaction*)malloc(sizeof(LDKC2Tuple_usizeTransactionZ)), .datalen = 1 };
		*txdata.data = C2Tuple_usizeTransactionZ_new(0, LDKTransaction { .data = (uint8_t*)channel_open_tx, .datalen = sizeof(channel_open_tx), .data_is_owned = false });
		mons2.ConnectBlock(&channel_open_header, 1, txdata, broadcast, fee_est);

		ChannelManager_block_connected(&cm1, &header_1, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, 2);
		ChannelManager_block_connected(&cm2, &header_1, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, 2);
		mons1.ConnectBlock(&header_1, 2, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, broadcast, fee_est);
		mons2.ConnectBlock(&header_1, 2, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, broadcast, fee_est);

		ChannelManager_block_connected(&cm1, &header_2, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, 3);
		ChannelManager_block_connected(&cm2, &header_2, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, 3);
		mons1.ConnectBlock(&header_2, 3, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, broadcast, fee_est);
		mons2.ConnectBlock(&header_2, 3, LDKCVec_C2Tuple_usizeTransactionZZ { .data = NULL, .datalen = 0 }, broadcast, fee_est);

		PeerManager_process_events(&net1);
		PeerManager_process_events(&net2);

		// Now send funds from 1 to 2!
		while (true) {
			LDK::CVec_ChannelDetailsZ outbound_channels = ChannelManager_list_usable_channels(&cm1);
			if (outbound_channels->datalen == 1) {
				const LDKChannelDetails *channel = &outbound_channels->data[0];
				// Note that the channel ID is the same as the channel txid reversed as the output index is 0
				uint8_t expected_chan_id[32];
				for (int i = 0; i < 32; i++) { expected_chan_id[i] = channel_open_txid[31-i]; }
				assert(!memcmp(ChannelDetails_get_channel_id(channel), expected_chan_id, 32));
				assert(!memcmp(ChannelDetails_get_remote_network_id(channel).compressed_form,
						ChannelManager_get_our_node_id(&cm2).compressed_form, 33));
				assert(ChannelDetails_get_channel_value_satoshis(channel) == 40000);
				// We opened the channel with 1000 push_msat:
				assert(ChannelDetails_get_outbound_capacity_msat(channel) == 40000*1000 - 1000);
				assert(ChannelDetails_get_inbound_capacity_msat(channel) == 1000);
				assert(ChannelDetails_get_is_live(channel));
				break;
			}
			std::this_thread::yield();
		}

		LDK::CVec_ChannelDetailsZ outbound_channels = ChannelManager_list_usable_channels(&cm1);
		LDKThirtyTwoBytes payment_secret;
		memset(payment_secret.data, 0x42, 32);
		{
			LDK::LockedNetworkGraph graph_2_locked = NetGraphMsgHandler_read_locked_graph(&net_graph2);
			LDK::NetworkGraph graph_2_ref = LockedNetworkGraph_graph(&graph_2_locked);
			LDK::CResult_RouteLightningErrorZ route = get_route(ChannelManager_get_our_node_id(&cm1), &graph_2_ref, ChannelManager_get_our_node_id(&cm2), &outbound_channels, LDKCVec_RouteHintZ {
					.data = NULL, .datalen = 0
				}, 5000, 10, logger1);
			assert(route->result_ok);
			LDK::CResult_NonePaymentSendFailureZ send_res = ChannelManager_send_payment(&cm1, route->contents.result, payment_hash_1, payment_secret);
			assert(send_res->result_ok);
		}

		mons_updated = 0;
		PeerManager_process_events(&net1);
		while (mons_updated != 4) {
			std::this_thread::yield();
		}

		// Check that we received the payment!
		LDKEventsProvider ev2 = ChannelManager_as_EventsProvider(&cm2);
		while (true) {
			LDK::CVec_EventZ events = ev2.get_and_clear_pending_events(ev2.this_arg);
			if (events->datalen == 1) {
				assert(events->data[0].tag == LDKEvent_PendingHTLCsForwardable);
				break;
			}
			std::this_thread::yield();
		}
		ChannelManager_process_pending_htlc_forwards(&cm2);
		PeerManager_process_events(&net2);

		mons_updated = 0;
		{
			LDK::CVec_EventZ events = ev2.get_and_clear_pending_events(ev2.this_arg);
			assert(events->datalen == 1);
			assert(events->data[0].tag == LDKEvent_PaymentReceived);
			assert(!memcmp(events->data[0].payment_received.payment_hash.data, payment_hash_1.data, 32));
			assert(!memcmp(events->data[0].payment_received.payment_secret.data, payment_secret.data, 32));
			assert(events->data[0].payment_received.amt == 5000);
			assert(ChannelManager_claim_funds(&cm2, payment_preimage_1, payment_secret, 5000));
		}
		PeerManager_process_events(&net2);
		// Wait until we've passed through a full set of monitor updates (ie new preimage + CS/RAA messages)
		while (mons_updated != 5) {
			std::this_thread::yield();
		}
		{
			LDK::CVec_EventZ events = ev1.get_and_clear_pending_events(ev1.this_arg);
			assert(events->datalen == 1);
			assert(events->data[0].tag == LDKEvent_PaymentSent);
			assert(!memcmp(events->data[0].payment_sent.payment_preimage.data, payment_preimage_1.data, 32));
		}

		conn.stop();

		cm1_ser = ChannelManager_write(&cm1);
		cm2_ser = ChannelManager_write(&cm2);
	}

	LDK::CVec_ChannelMonitorZ mons_list1 = LDKCVec_ChannelMonitorZ { .data = (LDKChannelMonitor*)malloc(sizeof(LDKChannelMonitor)), .datalen = 1 };
	assert(mons1.mons.size() == 1);
	mons_list1->data[0] = *& std::get<1>(mons1.mons[0]); // Note that we need a reference, thus need a raw clone here, which *& does.
	mons_list1->data[0].is_owned = false; // XXX: God this sucks
	uint8_t node_seed[32];
	memset(&node_seed, 0, 32);
	LDK::KeysManager keys1 = KeysManager_new(&node_seed, network, 1, 0);
	LDK::KeysInterface keys_source1 = KeysManager_as_KeysInterface(&keys1);

	LDK::ChannelManagerReadArgs cm1_args = ChannelManagerReadArgs_new(KeysManager_as_KeysInterface(&keys1), fee_est, mon1, broadcast, logger1, UserConfig_default(), std::move(mons_list1));
	LDK::CResult_C2Tuple_BlockHashChannelManagerZDecodeErrorZ cm1_read =
		C2Tuple_BlockHashChannelManagerZ_read(LDKu8slice { .data = cm1_ser->data, .datalen = cm1_ser -> datalen}, std::move(cm1_args));
	assert(cm1_read->result_ok);
	LDK::ChannelManager cm1(std::move(cm1_read->contents.result->b));

	LDK::CVec_ChannelMonitorZ mons_list2 = LDKCVec_ChannelMonitorZ { .data = (LDKChannelMonitor*)malloc(sizeof(LDKChannelMonitor)), .datalen = 1 };
	assert(mons2.mons.size() == 1);
	mons_list2->data[0] = *& std::get<1>(mons2.mons[0]); // Note that we need a reference, thus need a raw clone here, which *& does.
	mons_list2->data[0].is_owned = false; // XXX: God this sucks
	memset(&node_seed, 1, 32);
	LDK::KeysManager keys2 = KeysManager_new(&node_seed, network, 1, 0);

	LDK::ChannelManagerReadArgs cm2_args = ChannelManagerReadArgs_new(KeysManager_as_KeysInterface(&keys2), fee_est, mon2, broadcast, logger2, UserConfig_default(), std::move(mons_list2));
	LDK::CResult_C2Tuple_BlockHashChannelManagerZDecodeErrorZ cm2_read =
		C2Tuple_BlockHashChannelManagerZ_read(LDKu8slice { .data = cm2_ser->data, .datalen = cm2_ser -> datalen}, std::move(cm2_args));
	assert(cm2_read->result_ok);
	LDK::ChannelManager cm2(std::move(cm2_read->contents.result->b));

	// Attempt to close the channel...
	uint8_t chan_id[32];
	for (int i = 0; i < 32; i++) { chan_id[i] = channel_open_txid[31-i]; }
	LDK::CResult_NoneAPIErrorZ close_res = ChannelManager_close_channel(&cm1, &chan_id);
	assert(!close_res->result_ok); // Note that we can't close while disconnected!

	// Open a connection!
	LDK::MessageHandler msg_handler1 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm1), NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph1));
	random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
	LDK::PeerManager net1 = PeerManager_new(std::move(msg_handler1), node_secret1, &random_bytes.data, logger1);

	LDK::MessageHandler msg_handler2 = MessageHandler_new(ChannelManager_as_ChannelMessageHandler(&cm2), NetGraphMsgHandler_as_RoutingMessageHandler(&net_graph2));
	random_bytes = keys_source1->get_secure_random_bytes(keys_source1->this_arg);
	LDK::PeerManager net2 = PeerManager_new(std::move(msg_handler2), node_secret2, &random_bytes.data, logger2);

	PeersConnection conn(cm1, cm2, net1, net2);

	while (true) {
		// Wait for the channels to be considered up once the reestablish messages are processed
		LDK::CVec_ChannelDetailsZ outbound_channels = ChannelManager_list_usable_channels(&cm1);
		if (outbound_channels->datalen == 1) {
			break;
		}
	}

	// Actually close the channel
	close_res = ChannelManager_close_channel(&cm1, &chan_id);
	assert(close_res->result_ok);
	PeerManager_process_events(&net1);
	num_txs_broadcasted = 0;
	while (num_txs_broadcasted != 2) {
		std::this_thread::yield();
	}
	LDK::CVec_ChannelDetailsZ chans_after_close1 = ChannelManager_list_channels(&cm1);
	assert(chans_after_close1->datalen == 0);
	LDK::CVec_ChannelDetailsZ chans_after_close2 = ChannelManager_list_channels(&cm2);
	assert(chans_after_close2->datalen == 0);

	conn.stop();

	// Few extra random tests:
	LDKSecretKey sk;
	memset(&sk, 42, 32);
	LDKC2Tuple_u64u64Z kdiv_params;
	kdiv_params.a = 42;
	kdiv_params.b = 42;
	LDK::InMemoryChannelKeys keys = InMemoryChannelKeys_new(sk, sk, sk, sk, sk, random_bytes, 42, kdiv_params);
}