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#pragma once
#include "channel.h"
#include <erebos/storage.h>
#include <netinet/in.h>
#include <cstdint>
#include <memory>
#include <mutex>
#include <variant>
#include <vector>
#include <optional>
namespace erebos {
using std::mutex;
using std::optional;
using std::unique_ptr;
using std::variant;
using std::vector;
class NetworkProtocol
{
public:
NetworkProtocol();
explicit NetworkProtocol(int sock, Identity self);
NetworkProtocol(const NetworkProtocol &) = delete;
NetworkProtocol(NetworkProtocol &&);
NetworkProtocol & operator=(const NetworkProtocol &) = delete;
NetworkProtocol & operator=(NetworkProtocol &&);
~NetworkProtocol();
static constexpr char defaultVersion[] = "0.1";
class Connection;
struct Header;
struct ReceivedAnnounce;
struct NewConnection;
struct ConnectionReadReady;
struct ProtocolClosed {};
using PollResult = variant<
ReceivedAnnounce,
NewConnection,
ConnectionReadReady,
ProtocolClosed>;
PollResult poll();
struct Cookie { vector<uint8_t> value; };
using ChannelState = variant<monostate,
Stored<ChannelRequest>,
shared_ptr<struct WaitingRef>,
Stored<ChannelAccept>,
unique_ptr<Channel>>;
Connection connect(sockaddr_in6 addr);
void updateIdentity(Identity self);
void announceTo(variant<sockaddr_in, sockaddr_in6> addr);
void shutdown();
private:
bool recvfrom(vector<uint8_t> & buffer, sockaddr_in6 & addr);
void sendto(const vector<uint8_t> & buffer, variant<sockaddr_in, sockaddr_in6> addr);
void sendCookie(variant<sockaddr_in, sockaddr_in6> addr);
optional<Connection> verifyNewConnection(const Header & header, sockaddr_in6 addr);
Cookie generateCookie(variant<sockaddr_in, sockaddr_in6> addr) const;
bool verifyCookie(variant<sockaddr_in, sockaddr_in6> addr, const Cookie & cookie) const;
int sock;
mutex protocolMutex;
vector<uint8_t> buffer;
optional<Identity> self;
struct ConnectionPriv;
vector<ConnectionPriv *> connections;
};
class NetworkProtocol::Connection
{
friend class NetworkProtocol;
Connection(unique_ptr<ConnectionPriv> p);
public:
Connection(const Connection &) = delete;
Connection(Connection &&);
Connection & operator=(const Connection &) = delete;
Connection & operator=(Connection &&);
~Connection();
using Id = uintptr_t;
Id id() const;
const sockaddr_in6 & peerAddress() const;
optional<Header> receive(const PartialStorage &);
bool send(const PartialStorage &, NetworkProtocol::Header,
const vector<Object> &, bool secure);
void close();
// temporary:
ChannelState & channel();
void trySendOutQueue();
private:
static optional<Header> parsePacket(vector<uint8_t> & buf,
Channel * channel, const PartialStorage & st,
optional<uint64_t> & secure);
unique_ptr<ConnectionPriv> p;
};
struct NetworkProtocol::ReceivedAnnounce { sockaddr_in6 addr; Digest digest; };
struct NetworkProtocol::NewConnection { Connection conn; };
struct NetworkProtocol::ConnectionReadReady { Connection::Id id; };
struct NetworkProtocol::Header
{
struct Acknowledged { Digest value; };
struct AcknowledgedSingle { uint64_t value; };
struct Version { string value; };
struct Initiation { Digest value; };
struct CookieSet { Cookie value; };
struct CookieEcho { Cookie value; };
struct DataRequest { Digest value; };
struct DataResponse { Digest value; };
struct AnnounceSelf { Digest value; };
struct AnnounceUpdate { Digest value; };
struct ChannelRequest { Digest value; };
struct ChannelAccept { Digest value; };
struct ServiceType { UUID value; };
struct ServiceRef { Digest value; };
using Item = variant<
Acknowledged,
AcknowledgedSingle,
Version,
Initiation,
CookieSet,
CookieEcho,
DataRequest,
DataResponse,
AnnounceSelf,
AnnounceUpdate,
ChannelRequest,
ChannelAccept,
ServiceType,
ServiceRef>;
Header(const vector<Item> & items): items(items) {}
static optional<Header> load(const PartialRef &);
static optional<Header> load(const PartialObject &);
PartialObject toObject(const PartialStorage &) const;
template<class T> const T * lookupFirst() const;
bool isAcknowledged() const;
vector<Item> items;
};
template<class T>
const T * NetworkProtocol::Header::lookupFirst() const
{
for (const auto & h : items)
if (auto ptr = std::get_if<T>(&h))
return ptr;
return nullptr;
}
bool operator==(const NetworkProtocol::Header::Item &, const NetworkProtocol::Header::Item &);
inline bool operator!=(const NetworkProtocol::Header::Item & left,
const NetworkProtocol::Header::Item & right)
{ return not (left == right); }
inline bool operator==(const NetworkProtocol::Cookie & left, const NetworkProtocol::Cookie & right)
{ return left.value == right.value; }
class ReplyBuilder
{
public:
void header(NetworkProtocol::Header::Item &&);
void body(const Ref &);
const vector<NetworkProtocol::Header::Item> & header() const { return mheader; }
vector<Object> body() const;
private:
vector<NetworkProtocol::Header::Item> mheader;
vector<Ref> mbody;
};
struct WaitingRef
{
const Storage storage;
const PartialRef ref;
vector<Digest> missing;
optional<Ref> check();
optional<Ref> check(ReplyBuilder &);
};
}
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