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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);
NetworkProtocol(const NetworkProtocol &) = delete;
NetworkProtocol(NetworkProtocol &&);
NetworkProtocol & operator=(const NetworkProtocol &) = delete;
NetworkProtocol & operator=(NetworkProtocol &&);
~NetworkProtocol();
class Connection;
struct Header;
struct NewConnection;
struct ConnectionReadReady;
struct ProtocolClosed {};
using PollResult = variant<
NewConnection,
ConnectionReadReady,
ProtocolClosed>;
PollResult poll();
using ChannelState = variant<monostate,
Stored<ChannelRequest>,
shared_ptr<struct WaitingRef>,
Stored<ChannelAccept>,
unique_ptr<Channel>>;
Connection connect(sockaddr_in6 addr);
bool recvfrom(vector<uint8_t> & buffer, sockaddr_in6 & addr);
void sendto(const vector<uint8_t> & buffer, sockaddr_in addr);
void sendto(const vector<uint8_t> & buffer, sockaddr_in6 addr);
void shutdown();
private:
int sock;
mutex protocolMutex;
vector<uint8_t> buffer;
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 &, const NetworkProtocol::Header &,
const vector<Object> &, bool secure);
void close();
// temporary:
ChannelState & channel();
void trySendOutQueue();
private:
unique_ptr<ConnectionPriv> p;
};
struct NetworkProtocol::NewConnection { Connection conn; };
struct NetworkProtocol::ConnectionReadReady { Connection::Id id; };
struct NetworkProtocol::Header
{
enum class Type {
Acknowledged,
DataRequest,
DataResponse,
AnnounceSelf,
AnnounceUpdate,
ChannelRequest,
ChannelAccept,
ServiceType,
ServiceRef,
};
struct Item {
const Type type;
const variant<Digest, UUID> value;
bool operator==(const Item &) const;
bool operator!=(const Item & other) const { return !(*this == other); }
};
Header(const vector<Item> & items): items(items) {}
static optional<Header> load(const PartialRef &);
static optional<Header> load(const PartialObject &);
PartialObject toObject(const PartialStorage &) const;
const vector<Item> items;
};
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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