light cca refator and expose some cca values to the outside

announces participation

.gitignore

@@ -0,0 +1,22 @@
+.vs/
+*.o
+*.swp
+~*
+*~
+.idea/
+cmake-build-debug/
+cmake-build-debugandtest/
+cmake-build-release/
+*.stackdump
+*.coredump
+compile_commands.json
+/build*
+.clangd
+.cache
+
+.DS_Store
+.AppleDouble
+.LSOverride
+
+CMakeLists.txt.user*
+CMakeCache.txt

CMakeLists.txt

@@ -51,9 +51,25 @@ add_library(solanaceae_sha1_ngcft1
 	./solanaceae/ngc_ft1_sha1/hash_utils.hpp
 	./solanaceae/ngc_ft1_sha1/hash_utils.cpp
 
+	./solanaceae/ngc_ft1_sha1/util.hpp
+
 	./solanaceae/ngc_ft1_sha1/ft1_sha1_info.hpp
 	./solanaceae/ngc_ft1_sha1/ft1_sha1_info.cpp
 
+	./solanaceae/ngc_ft1_sha1/components.hpp
+	./solanaceae/ngc_ft1_sha1/components.cpp
+
+	./solanaceae/ngc_ft1_sha1/contact_components.hpp
+
+	./solanaceae/ngc_ft1_sha1/chunk_picker.hpp
+	./solanaceae/ngc_ft1_sha1/chunk_picker.cpp
+
+	./solanaceae/ngc_ft1_sha1/participation.hpp
+	./solanaceae/ngc_ft1_sha1/participation.cpp
+
+	./solanaceae/ngc_ft1_sha1/receiving_transfers.hpp
+	./solanaceae/ngc_ft1_sha1/receiving_transfers.cpp
+
 	./solanaceae/ngc_ft1_sha1/sha1_ngcft1.hpp
 	./solanaceae/ngc_ft1_sha1/sha1_ngcft1.cpp
 )
@@ -69,3 +85,22 @@ target_link_libraries(solanaceae_sha1_ngcft1 PUBLIC
 	solanaceae_file2
 )
 
+########################################
+
+option(SOLANACEAE_NGCFT1_SHA1_BUILD_TESTING "Build the solanaceae_ngcft1_sha1 tests" OFF)
+message("II SOLANACEAE_NGCFT1_SHA1_BUILD_TESTING " ${SOLANACEAE_NGCFT1_SHA1_BUILD_TESTING})
+
+# TODO: proper options n shit
+if (SOLANACEAE_NGCFT1_SHA1_BUILD_TESTING)
+	include(CTest)
+
+	#add_executable(bitset_tests
+	#    ./solanaceae/ngc_ft1_sha1/bitset_tests.cpp
+	#)
+
+	#target_link_libraries(bitset_tests PUBLIC
+	#    solanaceae_sha1_ngcft1
+	#)
+
+endif()
+

solanaceae/ngc_ext/ngcext.cpp

@@ -1,8 +1,9 @@
 #include "./ngcext.hpp"
 
 #include <iostream>
+#include <cassert>
 
-NGCEXTEventProvider::NGCEXTEventProvider(ToxEventProviderI& tep) : _tep(tep) {
+NGCEXTEventProvider::NGCEXTEventProvider(ToxI& t, ToxEventProviderI& tep) : _t(t), _tep(tep) {
 	_tep.subscribe(this, Tox_Event_Type::TOX_EVENT_GROUP_CUSTOM_PACKET);
 	_tep.subscribe(this, Tox_Event_Type::TOX_EVENT_GROUP_CUSTOM_PRIVATE_PACKET);
 }
@@ -261,6 +262,163 @@ bool NGCEXTEventProvider::parse_ft1_init_ack_v2(
 	);
 }
 
+bool NGCEXTEventProvider::parse_ft1_have(
+	uint32_t group_number, uint32_t peer_number,
+	const uint8_t* data, size_t data_size,
+	bool _private
+) {
+	if (!_private) {
+		std::cerr << "NGCEXT: ft1_have cant be public\n";
+		return false;
+	}
+
+	Events::NGCEXT_ft1_have e;
+	e.group_number = group_number;
+	e.peer_number = peer_number;
+	size_t curser = 0;
+
+	// - 4 byte (file_kind)
+	e.file_kind = 0u;
+	_DATA_HAVE(sizeof(e.file_kind), std::cerr << "NGCEXT: packet too small, missing file_kind\n"; return false)
+	for (size_t i = 0; i < sizeof(e.file_kind); i++, curser++) {
+		e.file_kind |= uint32_t(data[curser]) << (i*8);
+	}
+
+	// - X bytes (file_kind dependent id, differnt sizes)
+	uint16_t file_id_size = 0u;
+	_DATA_HAVE(sizeof(file_id_size), std::cerr << "NGCEXT: packet too small, missing file_id_size\n"; return false)
+	for (size_t i = 0; i < sizeof(file_id_size); i++, curser++) {
+		file_id_size |= uint32_t(data[curser]) << (i*8);
+	}
+
+	_DATA_HAVE(file_id_size, std::cerr << "NGCEXT: packet too small, missing file_id, or file_id_size too large(" << data_size-curser << ")\n"; return false)
+
+	e.file_id = {data+curser, data+curser+file_id_size};
+	curser += file_id_size;
+
+	// - array [
+	//   - 4 bytes (chunk index)
+	// - ]
+	while (curser < data_size) {
+		_DATA_HAVE(sizeof(uint32_t), std::cerr << "NGCEXT: packet too small, broken chunk index\n"; return false)
+		uint32_t chunk_index = 0u;
+		for (size_t i = 0; i < sizeof(chunk_index); i++, curser++) {
+			chunk_index |= uint32_t(data[curser]) << (i*8);
+		}
+		e.chunks.push_back(chunk_index);
+	}
+
+	return dispatch(
+		NGCEXT_Event::FT1_HAVE,
+		e
+	);
+}
+
+bool NGCEXTEventProvider::parse_ft1_bitset(
+	uint32_t group_number, uint32_t peer_number,
+	const uint8_t* data, size_t data_size,
+	bool _private
+) {
+	if (!_private) {
+		std::cerr << "NGCEXT: ft1_bitset cant be public\n";
+		return false;
+	}
+
+	Events::NGCEXT_ft1_bitset e;
+	e.group_number = group_number;
+	e.peer_number = peer_number;
+	size_t curser = 0;
+
+	// - 4 byte (file_kind)
+	e.file_kind = 0u;
+	_DATA_HAVE(sizeof(e.file_kind), std::cerr << "NGCEXT: packet too small, missing file_kind\n"; return false)
+	for (size_t i = 0; i < sizeof(e.file_kind); i++, curser++) {
+		e.file_kind |= uint32_t(data[curser]) << (i*8);
+	}
+
+	// - X bytes (file_kind dependent id, differnt sizes)
+	uint16_t file_id_size = 0u;
+	_DATA_HAVE(sizeof(file_id_size), std::cerr << "NGCEXT: packet too small, missing file_id_size\n"; return false)
+	for (size_t i = 0; i < sizeof(file_id_size); i++, curser++) {
+		file_id_size |= uint32_t(data[curser]) << (i*8);
+	}
+
+	_DATA_HAVE(file_id_size, std::cerr << "NGCEXT: packet too small, missing file_id, or file_id_size too large (" << data_size-curser << ")\n"; return false)
+
+	e.file_id = {data+curser, data+curser+file_id_size};
+	curser += file_id_size;
+
+	e.start_chunk = 0u;
+	_DATA_HAVE(sizeof(e.start_chunk), std::cerr << "NGCEXT: packet too small, missing start_chunk\n"; return false)
+	for (size_t i = 0; i < sizeof(e.start_chunk); i++, curser++) {
+		e.start_chunk |= uint32_t(data[curser]) << (i*8);
+	}
+
+	// - X bytes
+	// - array [
+	//   - 1 bit (have chunk)
+	// - ] (filled up with zero)
+	// high to low?
+	// simply rest of file packet
+	e.chunk_bitset = {data+curser, data+curser+(data_size-curser)};
+
+	return dispatch(
+		NGCEXT_Event::FT1_BITSET,
+		e
+	);
+}
+
+bool NGCEXTEventProvider::parse_ft1_have_all(
+	uint32_t group_number, uint32_t peer_number,
+	const uint8_t* data, size_t data_size,
+	bool _private
+) {
+	// can be public
+	// TODO: warn on public?
+
+	Events::NGCEXT_ft1_have_all e;
+	e.group_number = group_number;
+	e.peer_number = peer_number;
+	size_t curser = 0;
+
+	// - 4 byte (file_kind)
+	e.file_kind = 0u;
+	_DATA_HAVE(sizeof(e.file_kind), std::cerr << "NGCEXT: packet too small, missing file_kind\n"; return false)
+	for (size_t i = 0; i < sizeof(e.file_kind); i++, curser++) {
+		e.file_kind |= uint32_t(data[curser]) << (i*8);
+	}
+
+	_DATA_HAVE(1, std::cerr << "NGCEXT: packet too small, missing file_id\n"; return false)
+
+	// - X bytes (file_id, differnt sizes)
+	e.file_id = {data+curser, data+curser+(data_size-curser)};
+
+	return dispatch(
+		NGCEXT_Event::FT1_HAVE_ALL,
+		e
+	);
+}
+
+bool NGCEXTEventProvider::parse_pc1_announce(
+	uint32_t group_number, uint32_t peer_number,
+	const uint8_t* data, size_t data_size,
+	bool _private
+) {
+	// can be public
+	Events::NGCEXT_pc1_announce e;
+	e.group_number = group_number;
+	e.peer_number = peer_number;
+	size_t curser = 0;
+
+	// - X bytes (id, differnt sizes)
+	e.id = {data+curser, data+curser+(data_size-curser)};
+
+	return dispatch(
+		NGCEXT_Event::PC1_ANNOUNCE,
+		e
+	);
+}
+
 bool NGCEXTEventProvider::handlePacket(
 	const uint32_t group_number,
 	const uint32_t peer_number,
@@ -292,6 +450,14 @@ bool NGCEXTEventProvider::handlePacket(
 			return parse_ft1_data_ack(group_number, peer_number, data+1, data_size-1, _private);
 		case NGCEXT_Event::FT1_MESSAGE:
 			return parse_ft1_message(group_number, peer_number, data+1, data_size-1, _private);
+		case NGCEXT_Event::FT1_HAVE:
+			return parse_ft1_have(group_number, peer_number, data+1, data_size-1, _private);
+		case NGCEXT_Event::FT1_BITSET:
+			return parse_ft1_bitset(group_number, peer_number, data+1, data_size-1, _private);
+		case NGCEXT_Event::FT1_HAVE_ALL:
+			return parse_ft1_have_all(group_number, peer_number, data+1, data_size-1, _private);
+		case NGCEXT_Event::PC1_ANNOUNCE:
+			return parse_pc1_announce(group_number, peer_number, data+1, data_size-1, _private);
 		default:
 			return false;
 	}
@@ -299,6 +465,276 @@ bool NGCEXTEventProvider::handlePacket(
 	return false;
 }
 
+bool NGCEXTEventProvider::send_ft1_request(
+	uint32_t group_number, uint32_t peer_number,
+	uint32_t file_kind,
+	const uint8_t* file_id, size_t file_id_size
+) {
+	// - 1 byte packet id
+	// - 4 byte file_kind
+	// - X bytes file_id
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_REQUEST));
+	for (size_t i = 0; i < sizeof(file_kind); i++) {
+		pkg.push_back((file_kind>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < file_id_size; i++) {
+		pkg.push_back(file_id[i]);
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_init(
+	uint32_t group_number, uint32_t peer_number,
+	uint32_t file_kind,
+	uint64_t file_size,
+	uint8_t transfer_id,
+	const uint8_t* file_id, size_t file_id_size
+) {
+	// - 1 byte packet id
+	// - 4 byte (file_kind)
+	// - 8 bytes (data size)
+	// - 1 byte (temporary_file_tf_id, for this peer only, technically just a prefix to distinguish between simultainious fts)
+	// - X bytes (file_kind dependent id, differnt sizes)
+
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_INIT));
+	for (size_t i = 0; i < sizeof(file_kind); i++) {
+		pkg.push_back((file_kind>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < sizeof(file_size); i++) {
+		pkg.push_back((file_size>>(i*8)) & 0xff);
+	}
+	pkg.push_back(transfer_id);
+	for (size_t i = 0; i < file_id_size; i++) {
+		pkg.push_back(file_id[i]);
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_init_ack(
+	uint32_t group_number, uint32_t peer_number,
+	uint8_t transfer_id
+) {
+	// - 1 byte packet id
+	// - 1 byte transfer_id
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_INIT_ACK));
+	pkg.push_back(transfer_id);
+
+	// - 2 bytes max_lossy_data_size
+	const uint16_t max_lossy_data_size = _t.toxGroupMaxCustomLossyPacketLength() - 4;
+	for (size_t i = 0; i < sizeof(uint16_t); i++) {
+		pkg.push_back((max_lossy_data_size>>(i*8)) & 0xff);
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_data(
+	uint32_t group_number, uint32_t peer_number,
+	uint8_t transfer_id,
+	uint16_t sequence_id,
+	const uint8_t* data, size_t data_size
+) {
+	assert(data_size > 0);
+
+	// TODO
+	// check header_size+data_size <= max pkg size
+
+	std::vector<uint8_t> pkg;
+	pkg.reserve(2048); // saves a ton of allocations
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_DATA));
+	pkg.push_back(transfer_id);
+	pkg.push_back(sequence_id & 0xff);
+	pkg.push_back((sequence_id >> (1*8)) & 0xff);
+
+	// TODO: optimize
+	for (size_t i = 0; i < data_size; i++) {
+		pkg.push_back(data[i]);
+	}
+
+	// lossy
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, false, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_data_ack(
+	uint32_t group_number, uint32_t peer_number,
+	uint8_t transfer_id,
+	const uint16_t* seq_ids, size_t seq_ids_size
+) {
+	std::vector<uint8_t> pkg;
+	pkg.reserve(1+1+2*32); // 32acks in a single pkg should be unlikely
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_DATA_ACK));
+	pkg.push_back(transfer_id);
+
+	// TODO: optimize
+	for (size_t i = 0; i < seq_ids_size; i++) {
+		pkg.push_back(seq_ids[i] & 0xff);
+		pkg.push_back((seq_ids[i] >> (1*8)) & 0xff);
+	}
+
+	// lossy
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, false, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_all_ft1_message(
+	uint32_t group_number,
+	uint32_t message_id,
+	uint32_t file_kind,
+	const uint8_t* file_id, size_t file_id_size
+) {
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_MESSAGE));
+
+	for (size_t i = 0; i < sizeof(message_id); i++) {
+		pkg.push_back((message_id>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < sizeof(file_kind); i++) {
+		pkg.push_back((file_kind>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < file_id_size; i++) {
+		pkg.push_back(file_id[i]);
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPacket(group_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_have(
+	uint32_t group_number, uint32_t peer_number,
+	uint32_t file_kind,
+	const uint8_t* file_id, size_t file_id_size,
+	const uint32_t* chunks_data, size_t chunks_size
+) {
+	// 16bit file id size
+	assert(file_id_size <= 0xffff);
+	if (file_id_size > 0xffff) {
+		return false;
+	}
+
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_HAVE));
+
+	for (size_t i = 0; i < sizeof(file_kind); i++) {
+		pkg.push_back((file_kind>>(i*8)) & 0xff);
+	}
+
+	// file id not last in packet, needs explicit size
+	const uint16_t file_id_size_cast = file_id_size;
+	for (size_t i = 0; i < sizeof(file_id_size_cast); i++) {
+		pkg.push_back((file_id_size_cast>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < file_id_size; i++) {
+		pkg.push_back(file_id[i]);
+	}
+
+	// rest is chunks
+	for (size_t c_i = 0; c_i < chunks_size; c_i++) {
+		for (size_t i = 0; i < sizeof(chunks_data[c_i]); i++) {
+			pkg.push_back((chunks_data[c_i]>>(i*8)) & 0xff);
+		}
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_bitset(
+	uint32_t group_number, uint32_t peer_number,
+	uint32_t file_kind,
+	const uint8_t* file_id, size_t file_id_size,
+	uint32_t start_chunk,
+	const uint8_t* bitset_data, size_t bitset_size // size is bytes
+) {
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_BITSET));
+
+	for (size_t i = 0; i < sizeof(file_kind); i++) {
+		pkg.push_back((file_kind>>(i*8)) & 0xff);
+	}
+
+	// file id not last in packet, needs explicit size
+	const uint16_t file_id_size_cast = file_id_size;
+	for (size_t i = 0; i < sizeof(file_id_size_cast); i++) {
+		pkg.push_back((file_id_size_cast>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < file_id_size; i++) {
+		pkg.push_back(file_id[i]);
+	}
+
+	for (size_t i = 0; i < sizeof(start_chunk); i++) {
+		pkg.push_back((start_chunk>>(i*8)) & 0xff);
+	}
+
+	for (size_t i = 0; i < bitset_size; i++) {
+		pkg.push_back(bitset_data[i]);
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_ft1_have_all(
+	uint32_t group_number, uint32_t peer_number,
+	uint32_t file_kind,
+	const uint8_t* file_id, size_t file_id_size
+) {
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_HAVE_ALL));
+
+	for (size_t i = 0; i < sizeof(file_kind); i++) {
+		pkg.push_back((file_kind>>(i*8)) & 0xff);
+	}
+	for (size_t i = 0; i < file_id_size; i++) {
+		pkg.push_back(file_id[i]);
+	}
+
+	// lossless
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+static std::vector<uint8_t> build_pc1_announce(const uint8_t* id_data, size_t id_size) {
+	// - 1 byte packet id
+	// - X bytes (id, differnt sizes)
+
+	std::vector<uint8_t> pkg;
+	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::PC1_ANNOUNCE));
+	for (size_t i = 0; i < id_size; i++) {
+		pkg.push_back(id_data[i]);
+	}
+	return pkg;
+}
+
+bool NGCEXTEventProvider::send_pc1_announce(
+	uint32_t group_number, uint32_t peer_number,
+	const uint8_t* id_data, size_t id_size
+) {
+	auto pkg = build_pc1_announce(id_data, id_size);
+
+	std::cout << "NEEP: sending PC1_ANNOUNCE s:" << pkg.size() - sizeof(NGCEXT_Event::PC1_ANNOUNCE) << "\n";
+
+	// lossless?
+	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
+}
+
+bool NGCEXTEventProvider::send_all_pc1_announce(
+	uint32_t group_number,
+	const uint8_t* id_data, size_t id_size
+) {
+	auto pkg = build_pc1_announce(id_data, id_size);
+
+	std::cout << "NEEP: sending all PC1_ANNOUNCE s:" << pkg.size() - sizeof(NGCEXT_Event::PC1_ANNOUNCE) << "\n";
+
+	// lossless?
+	return _t.toxGroupSendCustomPacket(group_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PACKET_OK;
+}
+
 bool NGCEXTEventProvider::onToxEvent(const Tox_Event_Group_Custom_Packet* e) {
 	const auto group_number = tox_event_group_custom_packet_get_group_number(e);
 	const auto peer_number = tox_event_group_custom_packet_get_peer_id(e);

solanaceae/ngc_ext/ngcext.hpp

@@ -3,6 +3,7 @@
 // solanaceae port of tox_ngc_ext
 
 #include <solanaceae/toxcore/tox_event_interface.hpp>
+#include <solanaceae/toxcore/tox_interface.hpp>
 #include <solanaceae/util/event_provider.hpp>
 
 #include <solanaceae/toxcore/tox_key.hpp>
@@ -119,7 +120,6 @@ namespace Events {
 		// - 4 byte (message_id)
 		uint32_t message_id;
 
-		// request the other side to initiate a FT
 		// - 4 byte (file_kind)
 		uint32_t file_kind;
 
@@ -127,6 +127,60 @@ namespace Events {
 		std::vector<uint8_t> file_id;
 	};
 
+	struct NGCEXT_ft1_have {
+		uint32_t group_number;
+		uint32_t peer_number;
+
+		// - 4 byte (file_kind)
+		uint32_t file_kind;
+
+		// - X bytes (file_kind dependent id, differnt sizes)
+		std::vector<uint8_t> file_id;
+
+		// - array [
+		//   - 4 bytes (chunk index)
+		// - ]
+		std::vector<uint32_t> chunks;
+	};
+
+	struct NGCEXT_ft1_bitset {
+		uint32_t group_number;
+		uint32_t peer_number;
+
+		// - 4 byte (file_kind)
+		uint32_t file_kind;
+
+		// - X bytes (file_kind dependent id, differnt sizes)
+		std::vector<uint8_t> file_id;
+
+		uint32_t start_chunk;
+
+		// - array [
+		//   - 1 bit (have chunk)
+		// - ] (filled up with zero)
+		// high to low?
+		std::vector<uint8_t> chunk_bitset;
+	};
+
+	struct NGCEXT_ft1_have_all {
+		uint32_t group_number;
+		uint32_t peer_number;
+
+		// - 4 byte (file_kind)
+		uint32_t file_kind;
+
+		// - X bytes (file_kind dependent id, differnt sizes)
+		std::vector<uint8_t> file_id;
+	};
+
+	struct NGCEXT_pc1_announce {
+		uint32_t group_number;
+		uint32_t peer_number;
+
+		// - X bytes (id, differnt sizes)
+		std::vector<uint8_t> id;
+	};
+
 } // Events
 
 enum class NGCEXT_Event : uint8_t {
@@ -186,11 +240,50 @@ enum class NGCEXT_Event : uint8_t {
 	// send file as message
 	// basically the opposite of request
 	// contains file_kind and file_id (and timestamp?)
-	// - 4 byte (message_id)
-	// - 4 byte (file_kind)
+	// - 4 bytes (message_id)
+	// - 4 bytes (file_kind)
 	// - X bytes (file_kind dependent id, differnt sizes)
 	FT1_MESSAGE,
 
+	// announce you have specified chunks, for given info
+	// this is info/chunk specific
+	// bundle these together to reduce overhead (like maybe every 16, max 1min)
+	// - 4 bytes (file_kind)
+	// - X bytes (file_kind dependent id, differnt sizes)
+	// - array [
+	//   - 4 bytes (chunk index)
+	// - ]
+	FT1_HAVE,
+
+	// tell the other peer which chunks, for a given info you have
+	// compressed down to a bitset (in parts)
+	// supposed to only be sent once on participation announcement, when mutual interest
+	// it is always assumed by the other side, that you dont have the chunk, until told otherwise,
+	// so you can be smart about what you send.
+	// - 4 bytes (file_kind)
+	// - X bytes (file_kind dependent id, differnt sizes)
+	// - 4 bytes (first chunk index in bitset)
+	// - array [
+	//   - 1 bit (have chunk)
+	// - ] (filled up with zero)
+	FT1_BITSET,
+
+	// announce you have all chunks, for given info
+	// prefer over have and bitset
+	// - 4 bytes (file_kind)
+	// - X bytes (file_kind dependent id, differnt sizes)
+	FT1_HAVE_ALL,
+
+	// TODO: FT1_IDONTHAVE, tell a peer you no longer have said chunk
+	// TODO: FT1_REJECT, tell a peer you wont fulfil the request
+
+	// tell another peer that you are participating in X
+	// you can reply with PC1_ANNOUNCE, to let the other side know, you too are participating in X
+	// you should NOT announce often, since this hits peers that not participate
+	// ft1 uses fk+id
+	// - x bytes (id, different sizes)
+	PC1_ANNOUNCE = 0x80 | 32u,
+
 	MAX
 };
 
@@ -204,15 +297,20 @@ struct NGCEXTEventI {
 	virtual bool onEvent(const Events::NGCEXT_ft1_data&) { return false; }
 	virtual bool onEvent(const Events::NGCEXT_ft1_data_ack&) { return false; }
 	virtual bool onEvent(const Events::NGCEXT_ft1_message&) { return false; }
+	virtual bool onEvent(const Events::NGCEXT_ft1_have&) { return false; }
+	virtual bool onEvent(const Events::NGCEXT_ft1_bitset&) { return false; }
+	virtual bool onEvent(const Events::NGCEXT_ft1_have_all&) { return false; }
+	virtual bool onEvent(const Events::NGCEXT_pc1_announce&) { return false; }
 };
 
 using NGCEXTEventProviderI = EventProviderI<NGCEXTEventI>;
 
 class NGCEXTEventProvider : public ToxEventI, public NGCEXTEventProviderI {
+	ToxI& _t;
 	ToxEventProviderI& _tep;
 
 	public:
-		NGCEXTEventProvider(ToxEventProviderI& tep/*, ToxI& t*/);
+		NGCEXTEventProvider(ToxI& t, ToxEventProviderI& tep);
 
 	protected:
 		bool parse_hs1_request_last_ids(
@@ -269,6 +367,30 @@ class NGCEXTEventProvider : public ToxEventI, public NGCEXTEventProviderI {
 			bool _private
 		);
 
+		bool parse_ft1_have(
+			uint32_t group_number, uint32_t peer_number,
+			const uint8_t* data, size_t data_size,
+			bool _private
+		);
+
+		bool parse_ft1_bitset(
+			uint32_t group_number, uint32_t peer_number,
+			const uint8_t* data, size_t data_size,
+			bool _private
+		);
+
+		bool parse_ft1_have_all(
+			uint32_t group_number, uint32_t peer_number,
+			const uint8_t* data, size_t data_size,
+			bool _private
+		);
+
+		bool parse_pc1_announce(
+			uint32_t group_number, uint32_t peer_number,
+			const uint8_t* data, size_t data_size,
+			bool _private
+		);
+
 		bool handlePacket(
 			const uint32_t group_number,
 			const uint32_t peer_number,
@@ -277,6 +399,78 @@ class NGCEXTEventProvider : public ToxEventI, public NGCEXTEventProviderI {
 			const bool _private
 		);
 
+	public: // send api
+		bool send_ft1_request(
+			uint32_t group_number, uint32_t peer_number,
+			uint32_t file_kind,
+			const uint8_t* file_id, size_t file_id_size
+		);
+
+		bool send_ft1_init(
+			uint32_t group_number, uint32_t peer_number,
+			uint32_t file_kind,
+			uint64_t file_size,
+			uint8_t transfer_id,
+			const uint8_t* file_id, size_t file_id_size
+		);
+
+		bool send_ft1_init_ack(
+			uint32_t group_number, uint32_t peer_number,
+			uint8_t transfer_id
+		);
+
+		bool send_ft1_data(
+			uint32_t group_number, uint32_t peer_number,
+			uint8_t transfer_id,
+			uint16_t sequence_id,
+			const uint8_t* data, size_t data_size
+		);
+
+		bool send_ft1_data_ack(
+			uint32_t group_number, uint32_t peer_number,
+			uint8_t transfer_id,
+			const uint16_t* seq_ids, size_t seq_ids_size
+		);
+
+		// TODO: add private version
+		bool send_all_ft1_message(
+			uint32_t group_number,
+			uint32_t message_id,
+			uint32_t file_kind,
+			const uint8_t* file_id, size_t file_id_size
+		);
+
+		bool send_ft1_have(
+			uint32_t group_number, uint32_t peer_number,
+			uint32_t file_kind,
+			const uint8_t* file_id, size_t file_id_size,
+			const uint32_t* chunks_data, size_t chunks_size
+		);
+
+		bool send_ft1_bitset(
+			uint32_t group_number, uint32_t peer_number,
+			uint32_t file_kind,
+			const uint8_t* file_id, size_t file_id_size,
+			uint32_t start_chunk,
+			const uint8_t* bitset_data, size_t bitset_size // size is bytes
+		);
+
+		bool send_ft1_have_all(
+			uint32_t group_number, uint32_t peer_number,
+			uint32_t file_kind,
+			const uint8_t* file_id, size_t file_id_size
+		);
+
+		bool send_pc1_announce(
+			uint32_t group_number, uint32_t peer_number,
+			const uint8_t* id_data, size_t id_size
+		);
+
+		bool send_all_pc1_announce(
+			uint32_t group_number,
+			const uint8_t* id_data, size_t id_size
+		);
+
 	protected:
 		bool onToxEvent(const Tox_Event_Group_Custom_Packet* e) override;
 		bool onToxEvent(const Tox_Event_Group_Custom_Private_Packet* e) override;

solanaceae/ngc_ft1/cca.hpp

@@ -54,7 +54,7 @@ struct CCAI {
 		virtual float getCurrentDelay(void) const = 0;
 
 		// return the current believed window in bytes of how much data can be inflight,
-		virtual float getWindow(void) = 0;
+		virtual float getWindow(void) const = 0;
 
 		// TODO: api for how much data we should send
 		// take time since last sent into account
@@ -64,8 +64,12 @@ struct CCAI {
 		// get the list of timed out seq_ids
 		virtual std::vector<SeqIDType> getTimeouts(void) const = 0;
 
+		// returns -1 if not implemented, can return 0
 		virtual int64_t inFlightCount(void) const { return -1; }
 
+		// returns -1 if not implemented, can return 0
+		virtual int64_t inFlightBytes(void) const { return -1; }
+
 	public: // callbacks
 		// data size is without overhead
 		virtual void onSent(SeqIDType seq, size_t data_size) = 0;

solanaceae/ngc_ft1/cubic.cpp

@@ -76,7 +76,7 @@ void CUBIC::onCongestion(void) {
 	}
 }
 
-float CUBIC::getWindow(void) {
+float CUBIC::getWindow(void) const {
 	return std::min<float>(getCWnD(), FlowOnly::getWindow());
 }
 

solanaceae/ngc_ft1/cubic.hpp

@@ -2,13 +2,8 @@
 
 #include "./flow_only.hpp"
 
-#include <chrono>
-
 struct CUBIC : public FlowOnly {
-	//using clock = std::chrono::steady_clock;
-
 	public: // config
-		//static constexpr float BETA {0.7f};
 		static constexpr float BETA {0.8f};
 		static constexpr float SCALING_CONSTANT {0.4f};
 		static constexpr float RTT_EMA_ALPHA = 0.1f; // 0.1 is very smooth, might need more
@@ -26,35 +21,17 @@ struct CUBIC : public FlowOnly {
 
 		float getCWnD(void) const;
 
-		// moving avg over the last few delay samples
-		// VERY sensitive to bundling acks
-		//float getCurrentDelay(void) const;
-
-		//void addRTT(float new_delay);
-
 		void onCongestion(void) override;
 
 	public: // api
 		CUBIC(size_t maximum_segment_data_size) : FlowOnly(maximum_segment_data_size) {}
 		virtual ~CUBIC(void) {}
 
-		float getWindow(void) override;
+		float getWindow(void) const override;
 
 		// TODO: api for how much data we should send
 		// take time since last sent into account
 		// respect max_byterate_allowed
 		int64_t canSend(float time_delta) override;
-
-		// get the list of timed out seq_ids
-		//std::vector<SeqIDType> getTimeouts(void) const override;
-
-	public: // callbacks
-		// data size is without overhead
-		//void onSent(SeqIDType seq, size_t data_size) override;
-
-		//void onAck(std::vector<SeqIDType> seqs) override;
-
-		// if discard, not resent, not inflight
-		//void onLoss(SeqIDType seq, bool discard) override;
 };
 

solanaceae/ngc_ft1/flow_only.cpp

@@ -30,6 +30,7 @@ void FlowOnly::updateWindow(void) {
 }
 
 void FlowOnly::updateCongestion(void) {
+	updateWindow();
 	const auto tmp_window = getWindow();
 	// packet window * 0.3
 	// but atleast 4
@@ -57,8 +58,7 @@ void FlowOnly::updateCongestion(void) {
 	}
 }
 
-float FlowOnly::getWindow(void) {
-	updateWindow();
+float FlowOnly::getWindow(void) const {
 	return _fwnd;
 }
 
@@ -102,11 +102,18 @@ int64_t FlowOnly::inFlightCount(void) const {
 	return _in_flight.size();
 }
 
+int64_t FlowOnly::inFlightBytes(void) const {
+	return _in_flight_bytes;
+}
+
 void FlowOnly::onSent(SeqIDType seq, size_t data_size) {
 	if constexpr (true) {
+		size_t sum {0u};
 		for (const auto& it : _in_flight) {
 			assert(it.id != seq);
+			sum += it.bytes;
 		}
+		assert(_in_flight_bytes == sum);
 	}
 
 	const auto& new_entry = _in_flight.emplace_back(

solanaceae/ngc_ft1/flow_only.hpp

@@ -4,7 +4,6 @@
 
 #include <chrono>
 #include <vector>
-#include <tuple>
 
 struct FlowOnly : public CCAI {
 	protected:
@@ -52,7 +51,8 @@ struct FlowOnly : public CCAI {
 		// VERY sensitive to bundling acks
 		float getCurrentDelay(void) const override;
 
-		float getWindow(void) override;
+		// call updateWindow() to update this value
+		float getWindow(void) const override;
 
 		void addRTT(float new_delay);
 
@@ -76,6 +76,7 @@ struct FlowOnly : public CCAI {
 		std::vector<SeqIDType> getTimeouts(void) const override;
 
 		int64_t inFlightCount(void) const override;
+		int64_t inFlightBytes(void) const override;
 
 	public: // callbacks
 		// data size is without overhead

solanaceae/ngc_ft1/ledbat.hpp

@@ -53,7 +53,7 @@ struct LEDBAT : public CCAI {
 
 		// return the current believed window in bytes of how much data can be inflight,
 		// without overstepping the delay requirement
-		float getWindow(void) override {
+		float getWindow(void) const override {
 			return _cwnd;
 		}
 

solanaceae/ngc_ft1/ngcft1.cpp

@@ -15,147 +15,6 @@
 #include <cassert>
 #include <vector>
 
-bool NGCFT1::sendPKG_FT1_REQUEST(
-	uint32_t group_number, uint32_t peer_number,
-	uint32_t file_kind,
-	const uint8_t* file_id, size_t file_id_size
-) {
-	// - 1 byte packet id
-	// - 4 byte file_kind
-	// - X bytes file_id
-	std::vector<uint8_t> pkg;
-	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_REQUEST));
-	for (size_t i = 0; i < sizeof(file_kind); i++) {
-		pkg.push_back((file_kind>>(i*8)) & 0xff);
-	}
-	for (size_t i = 0; i < file_id_size; i++) {
-		pkg.push_back(file_id[i]);
-	}
-
-	// lossless
-	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
-}
-
-bool NGCFT1::sendPKG_FT1_INIT(
-	uint32_t group_number, uint32_t peer_number,
-	uint32_t file_kind,
-	uint64_t file_size,
-	uint8_t transfer_id,
-	const uint8_t* file_id, size_t file_id_size
-) {
-	// - 1 byte packet id
-	// - 4 byte (file_kind)
-	// - 8 bytes (data size)
-	// - 1 byte (temporary_file_tf_id, for this peer only, technically just a prefix to distinguish between simultainious fts)
-	// - X bytes (file_kind dependent id, differnt sizes)
-
-	std::vector<uint8_t> pkg;
-	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_INIT));
-	for (size_t i = 0; i < sizeof(file_kind); i++) {
-		pkg.push_back((file_kind>>(i*8)) & 0xff);
-	}
-	for (size_t i = 0; i < sizeof(file_size); i++) {
-		pkg.push_back((file_size>>(i*8)) & 0xff);
-	}
-	pkg.push_back(transfer_id);
-	for (size_t i = 0; i < file_id_size; i++) {
-		pkg.push_back(file_id[i]);
-	}
-
-	// lossless
-	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
-}
-
-bool NGCFT1::sendPKG_FT1_INIT_ACK(
-	uint32_t group_number, uint32_t peer_number,
-	uint8_t transfer_id
-) {
-	// - 1 byte packet id
-	// - 1 byte transfer_id
-	std::vector<uint8_t> pkg;
-	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_INIT_ACK));
-	pkg.push_back(transfer_id);
-
-	// - 2 bytes max_lossy_data_size
-	const uint16_t max_lossy_data_size = _t.toxGroupMaxCustomLossyPacketLength() - 4;
-	for (size_t i = 0; i < sizeof(uint16_t); i++) {
-		pkg.push_back((max_lossy_data_size>>(i*8)) & 0xff);
-	}
-
-	// lossless
-	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
-}
-
-bool NGCFT1::sendPKG_FT1_DATA(
-	uint32_t group_number, uint32_t peer_number,
-	uint8_t transfer_id,
-	uint16_t sequence_id,
-	const uint8_t* data, size_t data_size
-) {
-	assert(data_size > 0);
-
-	// TODO
-	// check header_size+data_size <= max pkg size
-
-	std::vector<uint8_t> pkg;
-	pkg.reserve(2048); // saves a ton of allocations
-	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_DATA));
-	pkg.push_back(transfer_id);
-	pkg.push_back(sequence_id & 0xff);
-	pkg.push_back((sequence_id >> (1*8)) & 0xff);
-
-	// TODO: optimize
-	for (size_t i = 0; i < data_size; i++) {
-		pkg.push_back(data[i]);
-	}
-
-	// lossy
-	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, false, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
-}
-
-bool NGCFT1::sendPKG_FT1_DATA_ACK(
-	uint32_t group_number, uint32_t peer_number,
-	uint8_t transfer_id,
-	const uint16_t* seq_ids, size_t seq_ids_size
-) {
-	std::vector<uint8_t> pkg;
-	pkg.reserve(1+1+2*32); // 32acks in a single pkg should be unlikely
-	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_DATA_ACK));
-	pkg.push_back(transfer_id);
-
-	// TODO: optimize
-	for (size_t i = 0; i < seq_ids_size; i++) {
-		pkg.push_back(seq_ids[i] & 0xff);
-		pkg.push_back((seq_ids[i] >> (1*8)) & 0xff);
-	}
-
-	// lossy
-	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, false, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
-}
-
-bool NGCFT1::sendPKG_FT1_MESSAGE(
-	uint32_t group_number,
-	uint32_t message_id,
-	uint32_t file_kind,
-	const uint8_t* file_id, size_t file_id_size
-) {
-	std::vector<uint8_t> pkg;
-	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_MESSAGE));
-
-	for (size_t i = 0; i < sizeof(message_id); i++) {
-		pkg.push_back((message_id>>(i*8)) & 0xff);
-	}
-	for (size_t i = 0; i < sizeof(file_kind); i++) {
-		pkg.push_back((file_kind>>(i*8)) & 0xff);
-	}
-	for (size_t i = 0; i < file_id_size; i++) {
-		pkg.push_back(file_id[i]);
-	}
-
-	// lossless
-	return _t.toxGroupSendCustomPacket(group_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PACKET_OK;
-}
-
 void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_t peer_number, Group::Peer& peer, size_t idx, std::set<CCAI::SeqIDType>& timeouts_set, int64_t& can_packet_size) {
 	auto& tf_opt = peer.send_transfers.at(idx);
 	assert(tf_opt.has_value());
@@ -181,7 +40,8 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 				} else {
 					// timed out, resend
 					std::cerr << "NGCFT1 warning: ft init timed out, resending\n";
-					sendPKG_FT1_INIT(group_number, peer_number, tf.file_kind, tf.file_size, idx, tf.file_id.data(), tf.file_id.size());
+					//sendPKG_FT1_INIT(group_number, peer_number, tf.file_kind, tf.file_size, idx, tf.file_id.data(), tf.file_id.size());
+					_neep.send_ft1_init(group_number, peer_number, tf.file_kind, tf.file_size, idx, tf.file_id.data(), tf.file_id.size());
 					tf.inits_sent++;
 					tf.time_since_activity = 0.f;
 				}
@@ -191,7 +51,7 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 		case State::FINISHING: // we still have unacked packets
 			tf.ssb.for_each(time_delta, [&](uint16_t id, const std::vector<uint8_t>& data, float& time_since_activity) {
 				if (can_packet_size >= data.size() && timeouts_set.count({idx, id})) {
-					sendPKG_FT1_DATA(group_number, peer_number, idx, id, data.data(), data.size());
+					_neep.send_ft1_data(group_number, peer_number, idx, id, data.data(), data.size());
 					peer.cca->onLoss({idx, id}, false);
 					time_since_activity = 0.f;
 					timeouts_set.erase({idx, id});
@@ -200,8 +60,14 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 			});
 			if (tf.time_since_activity >= sending_give_up_after) {
 				// no ack after 30sec, close ft
-				// TODO: notify app
 				std::cerr << "NGCFT1 warning: sending ft finishing timed out, deleting\n";
+				dispatch(
+					NGCFT1_Event::send_done,
+					Events::NGCFT1_send_done{
+						group_number, peer_number,
+						static_cast<uint8_t>(idx),
+					}
+				);
 
 				// clean up cca
 				tf.ssb.for_each(time_delta, [&](uint16_t id, const std::vector<uint8_t>& data, float& time_since_activity) {
@@ -241,7 +107,7 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 				tf.ssb.for_each(time_delta, [&](uint16_t id, const std::vector<uint8_t>& data, float& time_since_activity) {
 					if (can_packet_size >= data.size() && time_since_activity >= peer.cca->getCurrentDelay() && timeouts_set.count({idx, id})) {
 						// TODO: can fail
-						sendPKG_FT1_DATA(group_number, peer_number, idx, id, data.data(), data.size());
+						_neep.send_ft1_data(group_number, peer_number, idx, id, data.data(), data.size());
 						peer.cca->onLoss({idx, id}, false);
 						time_since_activity = 0.f;
 						timeouts_set.erase({idx, id});
@@ -278,7 +144,7 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 					);
 
 					uint16_t seq_id = tf.ssb.add(std::move(new_data));
-					const bool sent = sendPKG_FT1_DATA(group_number, peer_number, idx, seq_id, tf.ssb.entries.at(seq_id).data.data(), tf.ssb.entries.at(seq_id).data.size());
+					const bool sent = _neep.send_ft1_data(group_number, peer_number, idx, seq_id, tf.ssb.entries.at(seq_id).data.data(), tf.ssb.entries.at(seq_id).data.size());
 					if (sent) {
 						peer.cca->onSent({idx, seq_id}, chunk_size);
 					} else {
@@ -295,8 +161,8 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 			break;
 		default: // invalid state, delete
 			std::cerr << "NGCFT1 error: ft in invalid state, deleting\n";
+			assert(false && "ft in invalid state");
 			tf_opt.reset();
-			//continue;
 			return;
 	}
 }
@@ -335,10 +201,33 @@ void NGCFT1::iteratePeer(float time_delta, uint32_t group_number, uint32_t peer_
 	// TODO: receiving tranfers?
 }
 
+const CCAI* NGCFT1::getPeerCCA(
+	uint32_t group_number,
+	uint32_t peer_number
+) const {
+	auto group_it = groups.find(group_number);
+	if (group_it == groups.end()) {
+		return nullptr;;
+	}
+
+	auto peer_it = group_it->second.peers.find(peer_number);
+	if (peer_it == group_it->second.peers.end()) {
+		return nullptr;;
+	}
+
+	const auto& cca_ptr = peer_it->second.cca;
+
+	if (!cca_ptr) {
+		return nullptr;;
+	}
+
+	return cca_ptr.get();
+}
+
 NGCFT1::NGCFT1(
 	ToxI& t,
 	ToxEventProviderI& tep,
-	NGCEXTEventProviderI& neep
+	NGCEXTEventProvider& neep
 ) : _t(t), _tep(tep), _neep(neep)
 {
 	_neep.subscribe(this, NGCEXT_Event::FT1_REQUEST);
@@ -352,6 +241,7 @@ NGCFT1::NGCFT1(
 }
 
 float NGCFT1::iterate(float time_delta) {
+	_time_since_activity += time_delta;
 	bool transfer_in_progress {false};
 	for (auto& [group_number, group] : groups) {
 		for (auto& [peer_number, peer] : group.peers) {
@@ -378,9 +268,13 @@ float NGCFT1::iterate(float time_delta) {
 	}
 
 	if (transfer_in_progress) {
+		_time_since_activity = 0.f;
 		// ~15ms for up to 1mb/s
 		// ~5ms for up to 4mb/s
 		return 0.005f; // 5ms
+	} else if (_time_since_activity < 0.5f) {
+		// bc of temporality
+		return 0.025f;
 	} else {
 		return 1.f; // once a sec might be too little
 	}
@@ -392,7 +286,7 @@ void NGCFT1::NGC_FT1_send_request_private(
 	const uint8_t* file_id, size_t file_id_size
 ) {
 	// TODO: error check
-	sendPKG_FT1_REQUEST(group_number, peer_number, file_kind, file_id, file_id_size);
+	_neep.send_ft1_request(group_number, peer_number, file_kind, file_id, file_id_size);
 }
 
 bool NGCFT1::NGC_FT1_send_init_private(
@@ -433,7 +327,7 @@ bool NGCFT1::NGC_FT1_send_init_private(
 	}
 
 	// TODO: check return value
-	sendPKG_FT1_INIT(group_number, peer_number, file_kind, file_size, idx, file_id, file_id_size);
+	_neep.send_ft1_init(group_number, peer_number, file_kind, file_size, idx, file_id, file_id_size);
 
 	peer.send_transfers[idx] = Group::Peer::SendTransfer{
 		file_kind,
@@ -463,12 +357,58 @@ bool NGCFT1::NGC_FT1_send_message_public(
 	message_id = randombytes_random();
 
 	// TODO: check return value
-	return sendPKG_FT1_MESSAGE(group_number, message_id, file_kind, file_id, file_id_size);
+	return _neep.send_all_ft1_message(group_number, message_id, file_kind, file_id, file_id_size);
+}
+
+float NGCFT1::getPeerDelay(uint32_t group_number, uint32_t peer_number) const {
+	auto* cca_ptr = getPeerCCA(group_number, peer_number);
+
+	if (cca_ptr == nullptr) {
+		return -1.f;
+	}
+
+	return cca_ptr->getCurrentDelay();
+}
+
+float NGCFT1::getPeerWindow(uint32_t group_number, uint32_t peer_number) const {
+	auto* cca_ptr = getPeerCCA(group_number, peer_number);
+
+	if (cca_ptr == nullptr) {
+		return -1.f;
+	}
+
+	return cca_ptr->getWindow();
+}
+
+int64_t NGCFT1::getPeerInFlightPackets(
+	uint32_t group_number,
+	uint32_t peer_number
+) const {
+	auto* cca_ptr = getPeerCCA(group_number, peer_number);
+
+	if (cca_ptr == nullptr) {
+		return -1;
+	}
+
+	return cca_ptr->inFlightCount();
+}
+
+int64_t NGCFT1::getPeerInFlightBytes(
+	uint32_t group_number,
+	uint32_t peer_number
+) const {
+	auto* cca_ptr = getPeerCCA(group_number, peer_number);
+
+	if (cca_ptr == nullptr) {
+		return -1;
+	}
+
+	return cca_ptr->inFlightCount();
 }
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_request& e) {
 //#if !NDEBUG
-	std::cout << "NGCFT1: FT1_REQUEST fk:" << e.file_kind << " [" << bin2hex(e.file_id) << "]\n";
+	std::cout << "NGCFT1: got FT1_REQUEST fk:" << e.file_kind << " [" << bin2hex(e.file_id) << "]\n";
 //#endif
 
 	// .... just rethrow??
@@ -485,7 +425,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_request& e) {
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init& e) {
 //#if !NDEBUG
-	std::cout << "NGCFT1: FT1_INIT fk:" << e.file_kind << " fs:" << e.file_size << " tid:" << int(e.transfer_id) << " [" << bin2hex(e.file_id) << "]\n";
+	std::cout << "NGCFT1: got FT1_INIT fk:" << e.file_kind << " fs:" << e.file_size << " tid:" << int(e.transfer_id) << " [" << bin2hex(e.file_id) << "]\n";
 //#endif
 
 	bool accept = false;
@@ -506,13 +446,13 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init& e) {
 		return true; // return true?
 	}
 
-	sendPKG_FT1_INIT_ACK(e.group_number, e.peer_number, e.transfer_id);
+	_neep.send_ft1_init_ack(e.group_number, e.peer_number, e.transfer_id);
 
 	std::cout << "NGCFT1: accepted init\n";
 
 	auto& peer = groups[e.group_number].peers[e.peer_number];
 	if (peer.recv_transfers[e.transfer_id].has_value()) {
-		std::cerr << "NGCFT1 warning: overwriting existing recv_transfer " << int(e.transfer_id) << "\n";
+		std::cerr << "NGCFT1 warning: overwriting existing recv_transfer " << int(e.transfer_id) << ", other peer started new transfer on preexising\n";
 	}
 
 	peer.recv_transfers[e.transfer_id] = Group::Peer::RecvTransfer{
@@ -529,7 +469,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init& e) {
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init_ack& e) {
 //#if !NDEBUG
-	std::cout << "NGCFT1: FT1_INIT_ACK mds:" << e.max_lossy_data_size << "\n";
+	std::cout << "NGCFT1: got FT1_INIT_ACK mds:" << e.max_lossy_data_size << "\n";
 //#endif
 
 	// we now should start sending data
@@ -580,7 +520,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init_ack& e) {
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_data& e) {
 #if !NDEBUG
-	//std::cout << "NGCFT1: FT1_DATA\n";
+	//std::cout << "NGCFT1: got FT1_DATA\n";
 #endif
 
 	if (e.data.empty()) {
@@ -628,7 +568,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_data& e) {
 	// TODO: check if this caps at max acks
 	if (!ack_seq_ids.empty()) {
 		// TODO: check return value
-		sendPKG_FT1_DATA_ACK(e.group_number, e.peer_number, e.transfer_id, ack_seq_ids.data(), ack_seq_ids.size());
+		_neep.send_ft1_data_ack(e.group_number, e.peer_number, e.transfer_id, ack_seq_ids.data(), ack_seq_ids.size());
 	}
 
 
@@ -642,6 +582,11 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_data& e) {
 				e.transfer_id
 			}
 		);
+
+		// delete transfer
+		// TODO: keep around for remote timeout + delay + offset, so we can be sure all acks where received
+		// or implement a dedicated finished that needs to be acked
+		peer.recv_transfers[e.transfer_id].reset();
 	}
 
 	return true;
@@ -649,7 +594,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_data& e) {
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_data_ack& e) {
 #if !NDEBUG
-	//std::cout << "NGCFT1: FT1_DATA_ACK\n";
+	//std::cout << "NGCFT1: got FT1_DATA_ACK\n";
 #endif
 
 	if (!groups.count(e.group_number)) {
@@ -702,7 +647,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_data_ack& e) {
 }
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_message& e) {
-	std::cout << "NGCFT1: FT1_MESSAGE mid:" << e.message_id << " fk:" << e.file_kind << " [" << bin2hex(e.file_id) << "]\n";
+	std::cout << "NGCFT1: got FT1_MESSAGE mid:" << e.message_id << " fk:" << e.file_kind << " [" << bin2hex(e.file_id) << "]\n";
 
 	// .... just rethrow??
 	// TODO: dont

solanaceae/ngc_ft1/ngcft1.hpp

@@ -131,16 +131,17 @@ using NGCFT1EventProviderI = EventProviderI<NGCFT1EventI>;
 class NGCFT1 : public ToxEventI, public NGCEXTEventI, public NGCFT1EventProviderI {
 	ToxI& _t;
 	ToxEventProviderI& _tep;
-	NGCEXTEventProviderI& _neep;
+	NGCEXTEventProvider& _neep; // not the interface?
 
 	std::default_random_engine _rng{std::random_device{}()};
 
+	float _time_since_activity {10.f};
+
 	// TODO: config
 	size_t acks_per_packet {3u}; // 3
 	float init_retry_timeout_after {4.f};
 	float sending_give_up_after {15.f}; // 30sec (per active transfer)
 
-
 	struct Group {
 		struct Peer {
 			uint32_t max_packet_data_size {500-4};
@@ -201,27 +202,21 @@ class NGCFT1 : public ToxEventI, public NGCEXTEventI, public NGCFT1EventProvider
 	std::map<uint32_t, Group> groups;
 
 	protected:
-		bool sendPKG_FT1_REQUEST(uint32_t group_number, uint32_t peer_number, uint32_t file_kind, const uint8_t* file_id, size_t file_id_size);
-		bool sendPKG_FT1_INIT(uint32_t group_number, uint32_t peer_number, uint32_t file_kind, uint64_t file_size, uint8_t transfer_id, const uint8_t* file_id, size_t file_id_size);
-		bool sendPKG_FT1_INIT_ACK(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id);
-		bool sendPKG_FT1_DATA(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, uint16_t sequence_id, const uint8_t* data, size_t data_size);
-		bool sendPKG_FT1_DATA_ACK(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const uint16_t* seq_ids, size_t seq_ids_size);
-		bool sendPKG_FT1_MESSAGE(uint32_t group_number, uint32_t message_id, uint32_t file_kind, const uint8_t* file_id, size_t file_id_size);
-
 		void updateSendTransfer(float time_delta, uint32_t group_number, uint32_t peer_number, Group::Peer& peer, size_t idx, std::set<CCAI::SeqIDType>& timeouts_set, int64_t& can_packet_size);
 		void iteratePeer(float time_delta, uint32_t group_number, uint32_t peer_number, Group::Peer& peer);
 
+		const CCAI* getPeerCCA(uint32_t group_number, uint32_t peer_number) const;
+
 	public:
 		NGCFT1(
 			ToxI& t,
 			ToxEventProviderI& tep,
-			NGCEXTEventProviderI& neep
+			NGCEXTEventProvider& neep
 		);
 
 		float iterate(float delta);
 
 	public: // ft1 api
-		// TODO: public variant?
 		void NGC_FT1_send_request_private(
 			uint32_t group_number, uint32_t peer_number,
 			uint32_t file_kind,
@@ -245,6 +240,23 @@ class NGCFT1 : public ToxEventI, public NGCEXTEventI, public NGCFT1EventProvider
 			const uint8_t* file_id, size_t file_id_size
 		);
 
+	public: // cca stuff
+		// rtt/delay
+		// negative on error or no cca
+		float getPeerDelay(uint32_t group_number, uint32_t peer_number) const;
+
+		// belived possible current window
+		// negative on error or no cca
+		float getPeerWindow(uint32_t group_number, uint32_t peer_number) const;
+
+		// packets in flight
+		// returns -1 if error or no cca
+		int64_t getPeerInFlightPackets(uint32_t group_number, uint32_t peer_number) const;
+
+		// actual bytes in flight (aka window)
+		// returns -1 if error or no cca
+		int64_t getPeerInFlightBytes(uint32_t group_number, uint32_t peer_number) const;
+
 	protected:
 		bool onEvent(const Events::NGCEXT_ft1_request&) override;
 		bool onEvent(const Events::NGCEXT_ft1_init&) override;

solanaceae/ngc_ft1_sha1/chunk_picker.cpp

@@ -0,0 +1,354 @@
+#include "./chunk_picker.hpp"
+
+#include <solanaceae/tox_contacts/components.hpp>
+
+#include "./components.hpp"
+#include "./contact_components.hpp"
+
+#include <algorithm>
+
+#include <iostream>
+
+// TODO: move ps to own file
+// picker strategies are generators
+// gen returns true if a valid chunk was picked
+// ps should be light weight and no persistant state
+// ps produce an index only once
+
+// simply scans from the beginning, requesting chunks in that order
+struct PickerStrategySequential {
+	const BitSet& chunk_candidates;
+	const size_t total_chunks;
+
+	size_t i {0u};
+
+	PickerStrategySequential(
+		const BitSet& chunk_candidates_,
+		const size_t total_chunks_,
+		const size_t start_offset_ = 0u
+	) :
+		chunk_candidates(chunk_candidates_),
+		total_chunks(total_chunks_),
+		i(start_offset_)
+	{}
+
+
+	bool gen(size_t& out_chunk_idx) {
+		for (; i < total_chunks && i < chunk_candidates.size_bits(); i++) {
+			if (chunk_candidates[i]) {
+				out_chunk_idx = i;
+				i++;
+				return true;
+			}
+		}
+
+		return false;
+	}
+};
+
+// chooses a random start position and then requests linearly from there
+struct PickerStrategyRandom {
+	const BitSet& chunk_candidates;
+	const size_t total_chunks;
+	std::minstd_rand& rng;
+
+	size_t count {0u};
+	size_t i {rng()%total_chunks};
+
+	PickerStrategyRandom(
+		const BitSet& chunk_candidates_,
+		const size_t total_chunks_,
+		std::minstd_rand& rng_
+	) :
+		chunk_candidates(chunk_candidates_),
+		total_chunks(total_chunks_),
+		rng(rng_)
+	{}
+
+	bool gen(size_t& out_chunk_idx) {
+		for (; count < total_chunks; count++, i++) {
+			// wrap around
+			if (i >= total_chunks) {
+				i = i%total_chunks;
+			}
+
+			if (chunk_candidates[i]) {
+				out_chunk_idx = i;
+				count++;
+				i++;
+				return true;
+			}
+		}
+
+		return false;
+	}
+};
+
+// switches randomly between random and sequential
+struct PickerStrategyRandomSequential {
+	PickerStrategyRandom psr;
+	PickerStrategySequential pssf;
+
+	// TODO: configurable
+	std::bernoulli_distribution d{0.5f};
+
+	PickerStrategyRandomSequential(
+		const BitSet& chunk_candidates_,
+		const size_t total_chunks_,
+		std::minstd_rand& rng_,
+		const size_t start_offset_ = 0u
+	) :
+		psr(chunk_candidates_, total_chunks_, rng_),
+		pssf(chunk_candidates_, total_chunks_, start_offset_)
+	{}
+
+	bool gen(size_t& out_chunk_idx) {
+		if (d(psr.rng)) {
+			return psr.gen(out_chunk_idx);
+		} else {
+			return pssf.gen(out_chunk_idx);
+		}
+	}
+};
+
+void ChunkPicker::updateParticipation(
+	Contact3Handle c,
+	ObjectRegistry& objreg
+) {
+	if (!c.all_of<Contact::Components::FT1Participation>()) {
+		participating_unfinished.clear();
+		return;
+	}
+
+	entt::dense_set<Object> checked;
+	for (const Object ov : c.get<Contact::Components::FT1Participation>().participating) {
+		const ObjectHandle o {objreg, ov};
+
+		if (participating_unfinished.contains(o)) {
+			if (!o.all_of<Components::FT1ChunkSHA1Cache, Components::FT1InfoSHA1>()) {
+				participating_unfinished.erase(o);
+				continue;
+			}
+
+			if (o.all_of<Message::Components::Transfer::TagPaused>()) {
+				participating_unfinished.erase(o);
+				continue;
+			}
+
+			if (o.get<Components::FT1ChunkSHA1Cache>().have_all) {
+				participating_unfinished.erase(o);
+			}
+		} else {
+			if (!o.all_of<Components::FT1ChunkSHA1Cache, Components::FT1InfoSHA1>()) {
+				continue;
+			}
+
+			if (o.all_of<Message::Components::Transfer::TagPaused>()) {
+				continue;
+			}
+
+			if (!o.get<Components::FT1ChunkSHA1Cache>().have_all) {
+				using Priority = Components::DownloadPriority::Priority;
+				Priority prio = Priority::NORMAL;
+
+				if (o.all_of<Components::DownloadPriority>()) {
+					prio = o.get<Components::DownloadPriority>().p;
+				}
+
+				uint16_t pskips =
+					prio == Priority::HIGHER ? 0u :
+					prio == Priority::HIGH ? 1u :
+					prio == Priority::NORMAL ? 2u :
+					prio == Priority::LOW ? 4u :
+					8u
+				;
+
+				participating_unfinished.emplace(o, ParticipationEntry{pskips});
+			}
+		}
+		checked.emplace(o);
+	}
+
+	// now we still need to remove left over unfinished.
+	// TODO: how did they get left over
+	entt::dense_set<Object> to_remove;
+	for (const auto& [o, _] : participating_unfinished) {
+		if (!checked.contains(o)) {
+			std::cerr << "unfinished contained non participating\n";
+			to_remove.emplace(o);
+		}
+	}
+	for (const auto& o : to_remove) {
+		participating_unfinished.erase(o);
+	}
+}
+
+std::vector<ChunkPicker::ContentChunkR> ChunkPicker::updateChunkRequests(
+	Contact3Handle c,
+	ObjectRegistry& objreg,
+	ReceivingTransfers& rt,
+	const size_t open_requests
+	//NGCFT1& nft
+) {
+	if (!static_cast<bool>(c)) {
+		assert(false); return {};
+	}
+
+	if (!c.all_of<Contact::Components::ToxGroupPeerEphemeral>()) {
+		assert(false); return {};
+	}
+	const auto [group_number, peer_number] = c.get<Contact::Components::ToxGroupPeerEphemeral>();
+
+	updateParticipation(c, objreg);
+
+	if (participating_unfinished.empty()) {
+		participating_in_last = entt::null;
+		return {};
+	}
+
+	std::vector<ContentChunkR> req_ret;
+
+	// count running tf and open requests
+	const size_t num_ongoing_transfers = rt.sizePeer(group_number, peer_number);
+	// TODO: account for open requests
+	const int64_t num_total = num_ongoing_transfers + open_requests;
+	// TODO: base max on rate(chunks per sec), gonna be ass with variable chunk size
+	const size_t num_requests = std::max<int64_t>(0, int64_t(max_tf_chunk_requests)-num_total);
+	std::cerr << "CP: want " << num_requests << "(rt:" << num_ongoing_transfers << " or:" << open_requests << ") from " << group_number << ":" << peer_number << "\n";
+
+	// while n < X
+
+	// round robin content (remember last obj)
+	if (!objreg.valid(participating_in_last) || !participating_unfinished.count(participating_in_last)) {
+		participating_in_last = participating_unfinished.begin()->first;
+		//participating_in_last = *participating_unfinished.begin();
+	}
+	assert(objreg.valid(participating_in_last));
+
+	auto it = participating_unfinished.find(participating_in_last);
+	// hard limit robin rounds to array size time 20
+	for (size_t i = 0; req_ret.size() < num_requests && i < participating_unfinished.size()*20; i++) {
+		if (it == participating_unfinished.end()) {
+			it = participating_unfinished.begin();
+		}
+
+		if (it->second.skips < it->second.should_skip) {
+			it->second.skips++;
+			continue;
+		}
+
+		ObjectHandle o {objreg, it->first};
+
+		// intersect self have with other have
+		if (!o.all_of<Components::RemoteHave, Components::FT1ChunkSHA1Cache, Components::FT1InfoSHA1>()) {
+			// rare case where no one other has anything
+			continue;
+		}
+
+		const auto& cc = o.get<Components::FT1ChunkSHA1Cache>();
+		if (cc.have_all) {
+			std::cerr << "ChunkPicker error: completed content still in participating_unfinished!\n";
+			continue;
+		}
+
+		const auto& others_have = o.get<Components::RemoteHave>().others;
+		auto other_it = others_have.find(c);
+		if (other_it == others_have.end()) {
+			// rare case where the other is participating but has nothing
+			continue;
+		}
+
+		const auto& other_have = other_it->second;
+
+		BitSet chunk_candidates = cc.have_chunk;
+		if (!other_have.have_all) {
+			// AND is the same as ~(~A | ~B)
+			// that means we leave chunk_candidates as (have is inverted want)
+			// merge is or
+			// invert at the end
+			chunk_candidates
+				.merge(other_have.have.invert())
+				.invert();
+			// TODO: add intersect for more perf
+		} else {
+			chunk_candidates.invert();
+		}
+		const auto& info = o.get<Components::FT1InfoSHA1>();
+		const auto total_chunks = info.chunks.size();
+		auto& requested_chunks = o.get_or_emplace<Components::FT1ChunkSHA1Requested>().chunks;
+
+		// TODO: trim off round up to 8, since they are now always set
+
+		// now select (globaly) unrequested other have
+		// TODO: how do we prioritize within a file?
+		//  - sequential (walk from start (or readhead?))
+		//  - random (choose random start pos and walk)
+		//  - random/sequential (randomly choose between the 2)
+		//  - rarest (keep track of rarity and sort by that)
+		//  - steaming (use readhead to determain time critical chunks, potentially over requesting, first (relative to stream head) otherwise
+		//    maybe look into libtorrens deadline stuff
+		//  - arbitrary priority maps/functions (and combine with above in rations)
+
+		// TODO: configurable
+		size_t start_offset {0u};
+		if (o.all_of<Components::ReadHeadHint>()) {
+			const auto byte_offset = o.get<Components::ReadHeadHint>().offset_into_file;
+			if (byte_offset <= info.file_size) {
+				start_offset = o.get<Components::ReadHeadHint>().offset_into_file/info.chunk_size;
+			} else {
+				// error?
+			}
+		}
+		//PickerStrategySequential ps(chunk_candidates, total_chunks, start_offset);
+		//PickerStrategyRandom ps(chunk_candidates, total_chunks, _rng);
+		PickerStrategyRandomSequential ps(chunk_candidates, total_chunks, _rng, start_offset);
+		size_t out_chunk_idx {0};
+		while (ps.gen(out_chunk_idx) && req_ret.size() < num_requests) {
+			// out_chunk_idx is a potential candidate we can request form peer
+
+			// - check against double requests
+			if (std::find_if(req_ret.cbegin(), req_ret.cend(), [&](const ContentChunkR& x) -> bool {
+				return x.object == o && x.chunk_index == out_chunk_idx;
+			}) != req_ret.cend()) {
+				// already in return array
+				// how did we get here? should we fast exit? if sequential strat, we would want to
+				continue; // skip
+			}
+
+			// - check against global requests (this might differ based on strat)
+			if (requested_chunks.count(out_chunk_idx) != 0) {
+				continue;
+			}
+
+			// - we check against globally running transfers (this might differ based on strat)
+			if (rt.containsChunk(o, out_chunk_idx)) {
+				continue;
+			}
+
+			// if nothing else blocks this, add to ret
+			req_ret.push_back(ContentChunkR{o, out_chunk_idx});
+
+			// TODO: move this after packet was sent successfully
+			// (move net in? hmm)
+			requested_chunks[out_chunk_idx] = Components::FT1ChunkSHA1Requested::Entry{0.f, c};
+		}
+	}
+
+	if (it == participating_unfinished.end() || ++it == participating_unfinished.end()) {
+		participating_in_last = entt::null;
+	} else {
+		participating_in_last = it->first;
+	}
+
+	if (req_ret.size() < num_requests) {
+		std::cerr << "CP: could not fulfil, " << group_number << ":" << peer_number << " only has " << req_ret.size() << " candidates\n";
+	}
+
+	// -- no -- (just compat with old code, ignore)
+	// if n < X
+	//   optimistically request 1 chunk other does not have
+	//   (don't mark es requested? or lower cooldown to re-request?)
+
+	return req_ret;
+}
+

solanaceae/ngc_ft1_sha1/chunk_picker.hpp

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/object_store/object_store.hpp>
+
+#include "./components.hpp"
+
+#include "./receiving_transfers.hpp"
+
+#include <entt/container/dense_map.hpp>
+#include <entt/container/dense_set.hpp>
+
+#include <cstddef>
+#include <cstdint>
+#include <random>
+
+//#include <solanaceae/ngc_ft1/ngcft1.hpp>
+
+// goal is to always keep 2 transfers running and X(6) requests queued up
+// per peer
+
+struct ChunkPickerUpdateTag {};
+
+struct ChunkPickerTimer {
+	// adds update tag on 0
+	float timer {0.f};
+};
+
+// contact component?
+struct ChunkPicker {
+	// max transfers
+	static constexpr size_t max_tf_info_requests {1};
+	static constexpr size_t max_tf_chunk_requests {3}; // TODO: dynamic, function/factor of (window(delay*speed)/chunksize)
+
+	// TODO: cheaper init? tls rng for deep seeding?
+	std::minstd_rand _rng{std::random_device{}()};
+
+	// TODO: handle with hash utils?
+	struct ParticipationEntry {
+		ParticipationEntry(void) {}
+		ParticipationEntry(uint16_t s) : should_skip(s) {}
+		// skips in round robin -> lower should_skip => higher priority
+		// TODO: replace with enum value
+		uint16_t should_skip {2}; // 0 high, 8 low (double each time? 0,1,2,4,8)
+		uint16_t skips {0};
+	};
+	entt::dense_map<Object, ParticipationEntry> participating_unfinished;
+	Object participating_in_last {entt::null};
+
+	private: // TODO: properly sort
+	// updates participating_unfinished
+	void updateParticipation(
+		Contact3Handle c,
+		ObjectRegistry& objreg
+	);
+	public:
+
+	// ---------- tick ----------
+
+	//void sendInfoRequests();
+
+	// is this like a system?
+	struct ContentChunkR {
+		ObjectHandle object;
+		size_t chunk_index;
+	};
+	// returns list of chunks to request
+	[[nodiscard]] std::vector<ContentChunkR> updateChunkRequests(
+		Contact3Handle c,
+		ObjectRegistry& objreg,
+		ReceivingTransfers& rt,
+		const size_t open_requests
+		//NGCFT1& nft
+	);
+};
+

solanaceae/ngc_ft1_sha1/components.cpp

@@ -0,0 +1,25 @@
+#include "./components.hpp"
+
+std::vector<size_t> Components::FT1ChunkSHA1Cache::chunkIndices(const SHA1Digest& hash) const {
+	const auto it = chunk_hash_to_index.find(hash);
+	if (it != chunk_hash_to_index.cend()) {
+		return it->second;
+	} else {
+		return {};
+	}
+}
+
+bool Components::FT1ChunkSHA1Cache::haveChunk(const SHA1Digest& hash) const {
+	if (have_all) { // short cut
+		return true;
+	}
+
+	if (auto i_vec = chunkIndices(hash); !i_vec.empty()) {
+		// TODO: should i test all?
+		return have_chunk[i_vec.front()];
+	}
+
+	// not part of this file
+	return false;
+}
+

solanaceae/ngc_ft1_sha1/components.hpp

@@ -0,0 +1,98 @@
+#pragma once
+
+#include <solanaceae/contact/components.hpp>
+#include <solanaceae/message3/components.hpp>
+#include <solanaceae/message3/registry_message_model.hpp>
+
+#include <solanaceae/util/bitset.hpp>
+
+#include <entt/container/dense_set.hpp>
+
+#include "./ft1_sha1_info.hpp"
+#include "./hash_utils.hpp"
+
+#include <vector>
+
+
+// TODO: rename to object components
+namespace Components {
+
+	struct Messages {
+		// dense set instead?
+		std::vector<Message3Handle> messages;
+	};
+
+	using FT1InfoSHA1 = FT1InfoSHA1;
+
+	struct FT1InfoSHA1Data {
+		std::vector<uint8_t> data;
+	};
+
+	struct FT1InfoSHA1Hash {
+		std::vector<uint8_t> hash;
+	};
+
+	struct FT1ChunkSHA1Cache {
+		// TODO: extract have_chunk, have_all and have_count to generic comp
+
+		// have_chunk is the size of info.chunks.size(), or empty if have_all
+		// keep in mind bitset rounds up to 8s
+		BitSet have_chunk{0};
+
+		bool have_all {false};
+		size_t have_count {0};
+		entt::dense_map<SHA1Digest, std::vector<size_t>> chunk_hash_to_index;
+
+		std::vector<size_t> chunkIndices(const SHA1Digest& hash) const;
+		bool haveChunk(const SHA1Digest& hash) const;
+	};
+
+	struct FT1ChunkSHA1Requested {
+		// requested chunks with a timer since last request
+		struct Entry {
+			float timer {0.f};
+			Contact3 c {entt::null};
+		};
+		entt::dense_map<size_t, Entry> chunks;
+	};
+
+	// TODO: once announce is shipped, remove the "Suspected"
+	struct SuspectedParticipants {
+		entt::dense_set<Contact3> participants;
+	};
+
+	struct RemoteHave {
+		struct Entry {
+			bool have_all {false};
+			BitSet have;
+		};
+		entt::dense_map<Contact3, Entry> others;
+	};
+
+	struct ReRequestInfoTimer {
+		float timer {0.f};
+	};
+
+	struct DownloadPriority {
+		// download/retreival priority in comparison to other objects
+		// not all backends implement this
+		// priority can be weak, meaning low priority dls will still get transfer activity, just less often
+		enum class Priority {
+			HIGHER,
+			HIGH,
+			NORMAL,
+			LOW,
+			LOWER,
+		} p = Priority::NORMAL;
+	};
+
+	struct ReadHeadHint {
+		// points to the first byte we want
+		// this is just a hint, that can be set from outside
+		// to guide the sequential "piece picker" strategy
+		// ? the strategy *should* set this to the first byte we dont yet have
+		uint64_t offset_into_file {0u};
+	};
+
+} // Components
+

solanaceae/ngc_ft1_sha1/contact_components.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <solanaceae/object_store/object_store.hpp>
+#include <entt/container/dense_set.hpp>
+
+namespace Contact::Components {
+
+struct FT1Participation {
+	entt::dense_set<Object> participating;
+};
+
+} // Contact::Components
+

solanaceae/ngc_ft1_sha1/ft1_sha1_info.hpp

@@ -18,7 +18,7 @@ struct SHA1Digest {
 	bool operator==(const SHA1Digest& other) const { return data == other.data; }
 	bool operator!=(const SHA1Digest& other) const { return data != other.data; }
 
-	size_t size(void) const { return data.size(); }
+	constexpr size_t size(void) const { return data.size(); }
 };
 
 std::ostream& operator<<(std::ostream& out, const SHA1Digest& v);

solanaceae/ngc_ft1_sha1/participation.cpp

@@ -0,0 +1,48 @@
+#include "./participation.hpp"
+
+#include "./contact_components.hpp"
+#include "./chunk_picker.hpp"
+
+#include <iostream>
+
+bool addParticipation(Contact3Handle c, ObjectHandle o) {
+	bool was_new {false};
+	assert(static_cast<bool>(o));
+	assert(static_cast<bool>(c));
+
+	if (static_cast<bool>(o)) {
+		const auto [_, inserted] = o.get_or_emplace<Components::SuspectedParticipants>().participants.emplace(c);
+		was_new = inserted;
+	}
+
+	if (static_cast<bool>(c)) {
+		const auto [_, inserted] = c.get_or_emplace<Contact::Components::FT1Participation>().participating.emplace(o);
+		was_new = was_new || inserted;
+	}
+
+	//std::cout << "added " << (was_new?"new ":"") << "participant\n";
+
+	return was_new;
+}
+
+void removeParticipation(Contact3Handle c, ObjectHandle o) {
+	assert(static_cast<bool>(o));
+	assert(static_cast<bool>(c));
+
+	if (static_cast<bool>(o) && o.all_of<Components::SuspectedParticipants>()) {
+		o.get<Components::SuspectedParticipants>().participants.erase(c);
+	}
+
+	if (static_cast<bool>(c)) {
+		if (c.all_of<Contact::Components::FT1Participation>()) {
+			c.get<Contact::Components::FT1Participation>().participating.erase(o);
+		}
+
+		if (c.all_of<ChunkPicker>()) {
+			c.get<ChunkPicker>().participating_unfinished.erase(o);
+		}
+	}
+
+	//std::cout << "removed participant\n";
+}
+

solanaceae/ngc_ft1_sha1/participation.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <solanaceae/object_store/object_store.hpp>
+#include <solanaceae/contact/contact_model3.hpp>
+
+bool addParticipation(Contact3Handle c, ObjectHandle o);
+void removeParticipation(Contact3Handle c, ObjectHandle o);
+

solanaceae/ngc_ft1_sha1/receiving_transfers.cpp

@@ -0,0 +1,131 @@
+#include "./receiving_transfers.hpp"
+
+#include <iostream>
+
+void ReceivingTransfers::tick(float delta) {
+	for (auto peer_it = _data.begin(); peer_it != _data.end();) {
+		for (auto it = peer_it->second.begin(); it != peer_it->second.end();) {
+			it->second.time_since_activity += delta;
+
+			// if we have not heard for 20sec, timeout
+			if (it->second.time_since_activity >= 20.f) {
+				std::cerr << "SHA1_NGCFT1 warning: receiving tansfer timed out " << "." << int(it->first) << "\n";
+				// TODO: if info, requeue? or just keep the timer comp? - no, timer comp will continue ticking, even if loading
+				//it->second.v
+				it = peer_it->second.erase(it);
+			} else {
+				it++;
+			}
+		}
+
+		if (peer_it->second.empty()) {
+			// cleanup unused peers too agressive?
+			peer_it = _data.erase(peer_it);
+		} else {
+			peer_it++;
+		}
+	}
+}
+
+ReceivingTransfers::Entry& ReceivingTransfers::emplaceInfo(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const Entry::Info& info) {
+	auto& ent = _data[combine_ids(group_number, peer_number)][transfer_id];
+	ent.v = info;
+	return ent;
+}
+
+ReceivingTransfers::Entry& ReceivingTransfers::emplaceChunk(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const Entry::Chunk& chunk) {
+	assert(!chunk.chunk_indices.empty());
+	assert(!containsPeerChunk(group_number, peer_number, chunk.content, chunk.chunk_indices.front()));
+	auto& ent = _data[combine_ids(group_number, peer_number)][transfer_id];
+	ent.v = chunk;
+	return ent;
+}
+
+bool ReceivingTransfers::containsPeerTransfer(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id) const {
+	auto it = _data.find(combine_ids(group_number, peer_number));
+	if (it == _data.end()) {
+		return false;
+	}
+
+	return it->second.count(transfer_id);
+}
+
+bool ReceivingTransfers::containsChunk(ObjectHandle o, size_t chunk_idx) const {
+	for (const auto& [_, p] : _data) {
+		for (const auto& [_2, v] : p) {
+			if (!v.isChunk()) {
+				continue;
+			}
+
+			const auto& c = v.getChunk();
+			if (c.content != o) {
+				continue;
+			}
+
+			for (const auto idx : c.chunk_indices) {
+				if (idx == chunk_idx) {
+					return true;
+				}
+			}
+		}
+	}
+
+	return false;
+}
+
+bool ReceivingTransfers::containsPeerChunk(uint32_t group_number, uint32_t peer_number, ObjectHandle o, size_t chunk_idx) const {
+	auto it = _data.find(combine_ids(group_number, peer_number));
+	if (it == _data.end()) {
+		return false;
+	}
+
+	for (const auto& [_, v] : it->second) {
+		if (!v.isChunk()) {
+			continue;
+		}
+
+		const auto& c = v.getChunk();
+		if (c.content != o) {
+			continue;
+		}
+
+		for (const auto idx : c.chunk_indices) {
+			if (idx == chunk_idx) {
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+void ReceivingTransfers::removePeer(uint32_t group_number, uint32_t peer_number) {
+	_data.erase(combine_ids(group_number, peer_number));
+}
+
+void ReceivingTransfers::removePeerTransfer(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id) {
+	auto it = _data.find(combine_ids(group_number, peer_number));
+	if (it == _data.end()) {
+		return;
+	}
+
+	it->second.erase(transfer_id);
+}
+
+size_t ReceivingTransfers::size(void) const {
+	size_t count {0};
+	for (const auto& [_, p] : _data) {
+		count += p.size();
+	}
+	return count;
+}
+
+size_t ReceivingTransfers::sizePeer(uint32_t group_number, uint32_t peer_number) const {
+	auto it = _data.find(combine_ids(group_number, peer_number));
+	if (it == _data.end()) {
+		return 0;
+	}
+
+	return it->second.size();
+}
+

solanaceae/ngc_ft1_sha1/receiving_transfers.hpp

@@ -0,0 +1,66 @@
+#pragma once
+
+#include <solanaceae/object_store/object_store.hpp>
+
+#include <entt/container/dense_map.hpp>
+
+#include "./util.hpp"
+
+#include <cstdint>
+#include <variant>
+#include <vector>
+
+struct ReceivingTransfers {
+	struct Entry {
+		struct Info {
+			ObjectHandle content;
+			// copy of info data
+			// too large?
+			std::vector<uint8_t> info_data;
+		};
+
+		struct Chunk {
+			ObjectHandle content;
+			std::vector<size_t> chunk_indices;
+			// or data?
+			// if memmapped, this would be just a pointer
+		};
+
+		std::variant<Info, Chunk> v;
+
+		float time_since_activity {0.f};
+
+		bool isInfo(void) const { return std::holds_alternative<Info>(v); }
+		bool isChunk(void) const { return std::holds_alternative<Chunk>(v); }
+
+		Info& getInfo(void) { return std::get<Info>(v); }
+		const Info& getInfo(void) const { return std::get<Info>(v); }
+		Chunk& getChunk(void) { return std::get<Chunk>(v); }
+		const Chunk& getChunk(void) const { return std::get<Chunk>(v); }
+	};
+
+	// key is groupid + peerid
+	// TODO: replace with contact
+	//using ReceivingTransfers = entt::dense_map<uint64_t, entt::dense_map<uint8_t, ReceivingTransferE>>;
+	entt::dense_map<uint64_t, entt::dense_map<uint8_t, Entry>> _data;
+
+	void tick(float delta);
+
+	Entry& emplaceInfo(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const Entry::Info& info);
+	Entry& emplaceChunk(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id, const Entry::Chunk& chunk);
+
+	bool containsPeer(uint32_t group_number, uint32_t peer_number) const { return _data.count(combine_ids(group_number, peer_number)); }
+	bool containsPeerTransfer(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id) const;
+	bool containsChunk(ObjectHandle o, size_t chunk_idx) const;
+	bool containsPeerChunk(uint32_t group_number, uint32_t peer_number, ObjectHandle o, size_t chunk_idx) const;
+
+	auto& getPeer(uint32_t group_number, uint32_t peer_number) { return _data.at(combine_ids(group_number, peer_number)); }
+	auto& getTransfer(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id) { return getPeer(group_number, peer_number).at(transfer_id); }
+
+	void removePeer(uint32_t group_number, uint32_t peer_number);
+	void removePeerTransfer(uint32_t group_number, uint32_t peer_number, uint8_t transfer_id);
+
+	size_t size(void) const;
+	size_t sizePeer(uint32_t group_number, uint32_t peer_number) const;
+};
+

solanaceae/ngc_ft1_sha1/sha1_ngcft1.hpp

@@ -6,10 +6,12 @@
 #include <solanaceae/contact/contact_model3.hpp>
 #include <solanaceae/message3/registry_message_model.hpp>
 #include <solanaceae/tox_contacts/tox_contact_model2.hpp>
+#include <solanaceae/util/bitset.hpp>
 
 #include <solanaceae/ngc_ft1/ngcft1.hpp>
 
 #include "./ft1_sha1_info.hpp"
+#include "./receiving_transfers.hpp"
 
 #include <entt/entity/registry.hpp>
 #include <entt/entity/handle.hpp>
@@ -21,13 +23,15 @@
 #include <mutex>
 #include <list>
 
-class SHA1_NGCFT1 : public RegistryMessageModelEventI, public NGCFT1EventI {
+class SHA1_NGCFT1 : public ToxEventI, public RegistryMessageModelEventI, public NGCFT1EventI, public NGCEXTEventI {
 	ObjectStore2& _os;
 	// TODO: backend abstraction
 	Contact3Registry& _cr;
 	RegistryMessageModel& _rmm;
 	NGCFT1& _nft;
 	ToxContactModel2& _tcm;
+	ToxEventProviderI& _tep;
+	NGCEXTEventProvider& _neep;
 
 	std::minstd_rand _rng {1337*11};
 
@@ -66,55 +70,37 @@ class SHA1_NGCFT1 : public RegistryMessageModelEventI, public NGCFT1EventI {
 	// key is groupid + peerid
 	entt::dense_map<uint64_t, entt::dense_map<uint8_t, SendingTransfer>> _sending_transfers;
 
-	struct ReceivingTransfer {
-		struct Info {
-			ObjectHandle content;
-			// copy of info data
-			// too large?
-			std::vector<uint8_t> info_data;
-		};
-
-		struct Chunk {
-			ObjectHandle content;
-			std::vector<size_t> chunk_indices;
-			// or data?
-			// if memmapped, this would be just a pointer
-		};
-
-		std::variant<Info, Chunk> v;
-
-		float time_since_activity {0.f};
-	};
-	// key is groupid + peerid
-	entt::dense_map<uint64_t, entt::dense_map<uint8_t, ReceivingTransfer>> _receiving_transfers;
+	ReceivingTransfers _receiving_transfers;
 
 	// makes request rotate around open content
 	std::deque<ObjectHandle> _queue_content_want_info;
-	std::deque<ObjectHandle> _queue_content_want_chunk;
+
+	struct QBitsetEntry {
+		Contact3Handle c;
+		ObjectHandle o;
+	};
+	std::deque<QBitsetEntry> _queue_send_bitset;
+
+	// workaround missing contact events
+	// only used to remove participation on peer exit
+	entt::dense_map<uint64_t, Contact3Handle> _tox_peer_to_contact;
 
 	std::atomic_bool _info_builder_dirty {false};
 	std::mutex _info_builder_queue_mutex;
-	//struct InfoBuilderEntry {
-		//// called on completion on the iterate thread
-		//// (owning)
-		//std::function<void(void)> fn;
-	//};
 	using InfoBuilderEntry = std::function<void(void)>;
 	std::list<InfoBuilderEntry> _info_builder_queue;
 
-	static uint64_t combineIds(const uint32_t group_number, const uint32_t peer_number);
-
 	void updateMessages(ObjectHandle ce);
 
 	std::optional<std::pair<uint32_t, uint32_t>> selectPeerForRequest(ObjectHandle ce);
 
+	void queueBitsetSendFull(Contact3Handle c, ObjectHandle o);
+
 	public: // TODO: config
 		bool _udp_only {false};
 
-		size_t _max_concurrent_in {6};
-		size_t _max_concurrent_out {8};
-		// TODO: probably also includes running transfers rn (meh)
-		size_t _max_pending_requests {32}; // per content
+		size_t _max_concurrent_in {4}; // info only
+		size_t _max_concurrent_out {3*4}; // HACK: allow ideal number for 4 peers
 
 	public:
 		SHA1_NGCFT1(
@@ -122,10 +108,12 @@ class SHA1_NGCFT1 : public RegistryMessageModelEventI, public NGCFT1EventI {
 			Contact3Registry& cr,
 			RegistryMessageModel& rmm,
 			NGCFT1& nft,
-			ToxContactModel2& tcm
+			ToxContactModel2& tcm,
+			ToxEventProviderI& tep,
+			NGCEXTEventProvider& neep
 		);
 
-		void iterate(float delta);
+		float iterate(float delta);
 
 	protected: // rmm events (actions)
 		bool onEvent(const Message::Events::MessageUpdated&) override;
@@ -140,5 +128,13 @@ class SHA1_NGCFT1 : public RegistryMessageModelEventI, public NGCFT1EventI {
 		bool onEvent(const Events::NGCFT1_recv_message&) override;
 
 		bool sendFilePath(const Contact3 c, std::string_view file_name, std::string_view file_path) override;
+
+		bool onToxEvent(const Tox_Event_Group_Peer_Exit* e) override;
+
+		bool onEvent(const Events::NGCEXT_ft1_have&) override;
+		bool onEvent(const Events::NGCEXT_ft1_bitset&) override;
+		bool onEvent(const Events::NGCEXT_ft1_have_all&) override;
+
+		bool onEvent(const Events::NGCEXT_pc1_announce&) override;
 };
 

solanaceae/ngc_ft1_sha1/util.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <cstdint>
+
+inline static uint64_t combine_ids(const uint32_t group_number, const uint32_t peer_number) {
+	return (uint64_t(group_number) << 32) | peer_number;
+}
+
+inline static void decompose_ids(const uint64_t combined_id, uint32_t& group_number, uint32_t& peer_number) {
+	group_number = combined_id >> 32;
+	peer_number = combined_id & 0xffffffff;
+}
+