PeerfinderManager.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#ifndef RIPPLE_PEERFINDER_MANAGER_H_INCLUDED
#define RIPPLE_PEERFINDER_MANAGER_H_INCLUDED
 
#include <xrpld/core/Config.h>
#include <xrpld/peerfinder/Slot.h>
 
#include <xrpl/beast/clock/abstract_clock.h>
#include <xrpl/beast/utility/PropertyStream.h>
 
#include <boost/asio/ip/tcp.hpp>
 
#include <string_view>
 
namespace ripple {
namespace PeerFinder {
 
using clock_type = beast::abstract_clock<std::chrono::steady_clock>;
 
using IPAddresses = std::vector<beast::IP::Endpoint>;
 
//------------------------------------------------------------------------------
 
struct Config
{
    std::size_t maxPeers;
 
    std::size_t outPeers;
 
    std::size_t inPeers;
 
    bool peerPrivate = true;
 
    bool wantIncoming;
 
    bool autoConnect;
 
    std::uint16_t listeningPort;
 
    std::string features;
 
    int ipLimit;
 
    //--------------------------------------------------------------------------
 
    Config();
 
    std::size_t
    calcOutPeers() const;
 
    void
    applyTuning();
 
    void
    onWrite(beast::PropertyStream::Map& map);
 
    static Config
    makeConfig(
        ripple::Config const& config,
        std::uint16_t port,
        bool validationPublicKey,
        int ipLimit);
 
    friend bool
    operator==(Config const& lhs, Config const& rhs);
};
 
//------------------------------------------------------------------------------
 
struct Endpoint
{
    Endpoint() = default;
 
    Endpoint(beast::IP::Endpoint const& ep, std::uint32_t hops_);
 
    std::uint32_t hops = 0;
    beast::IP::Endpoint address;
};
 
inline bool
operator<(Endpoint const& lhs, Endpoint const& rhs)
{
    return lhs.address < rhs.address;
}
 
using Endpoints = std::vector<Endpoint>;
 
//------------------------------------------------------------------------------
 
enum class Result {
    inboundDisabled,
    duplicatePeer,
    ipLimitExceeded,
    full,
    success
};
 
inline std::string_view
to_string(Result result) noexcept
{
    switch (result)
    {
        case Result::inboundDisabled:
            return "inbound disabled";
        case Result::duplicatePeer:
            return "peer already connected";
        case Result::ipLimitExceeded:
            return "ip limit exceeded";
        case Result::full:
            return "slots full";
        case Result::success:
            return "success";
    }
 
    return "unknown";
}
 
class Manager : public beast::PropertyStream::Source
{
protected:
    Manager() noexcept;
 
public:
    virtual ~Manager() = default;
 
    virtual void
    setConfig(Config const& config) = 0;
 
    virtual void
    start() = 0;
 
    virtual void
    stop() = 0;
 
    virtual Config
    config() = 0;
 
    virtual void
    addFixedPeer(
        std::string const& name,
        std::vector<beast::IP::Endpoint> const& addresses) = 0;
 
    virtual void
    addFallbackStrings(
        std::string const& name,
        std::vector<std::string> const& strings) = 0;
 
    /* VFALCO NOTE Unimplemented
    virtual void addFallbackURL (std::string const& name,
        std::string const& url) = 0;
    */
 
    //--------------------------------------------------------------------------
 
    virtual std::pair<std::shared_ptr<Slot>, Result>
    new_inbound_slot(
        beast::IP::Endpoint const& local_endpoint,
        beast::IP::Endpoint const& remote_endpoint) = 0;
 
    virtual std::pair<std::shared_ptr<Slot>, Result>
    new_outbound_slot(beast::IP::Endpoint const& remote_endpoint) = 0;
 
    virtual void
    on_endpoints(
        std::shared_ptr<Slot> const& slot,
        Endpoints const& endpoints) = 0;
 
    virtual void
    on_closed(std::shared_ptr<Slot> const& slot) = 0;
 
    virtual void
    on_failure(std::shared_ptr<Slot> const& slot) = 0;
 
    virtual void
    onRedirects(
        boost::asio::ip::tcp::endpoint const& remote_address,
        std::vector<boost::asio::ip::tcp::endpoint> const& eps) = 0;
 
    //--------------------------------------------------------------------------
 
    virtual bool
    onConnected(
        std::shared_ptr<Slot> const& slot,
        beast::IP::Endpoint const& local_endpoint) = 0;
 
    virtual Result
    activate(
        std::shared_ptr<Slot> const& slot,
        PublicKey const& key,
        bool reserved) = 0;
 
    virtual std::vector<Endpoint>
    redirect(std::shared_ptr<Slot> const& slot) = 0;
 
    virtual std::vector<beast::IP::Endpoint>
    autoconnect() = 0;
 
    virtual std::vector<std::pair<std::shared_ptr<Slot>, std::vector<Endpoint>>>
    buildEndpointsForPeers() = 0;
 
    virtual void
    once_per_second() = 0;
};
 
}  // namespace PeerFinder
}  // namespace ripple
 
#endif