Sim.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012-2017 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_TEST_CSF_SIM_H_INCLUDED
#define RIPPLE_TEST_CSF_SIM_H_INCLUDED
 
#include <test/csf/BasicNetwork.h>
#include <test/csf/CollectorRef.h>
#include <test/csf/Digraph.h>
#include <test/csf/Peer.h>
#include <test/csf/PeerGroup.h>
#include <test/csf/Scheduler.h>
#include <test/csf/SimTime.h>
#include <test/csf/TrustGraph.h>
 
#include <deque>
#include <iostream>
#include <random>
 
namespace ripple {
namespace test {
namespace csf {
 
class BasicSink : public beast::Journal::Sink
{
    Scheduler::clock_type const& clock_;
 
public:
    BasicSink(Scheduler::clock_type const& clock)
        : Sink(beast::severities::kDisabled, false), clock_{clock}
    {
    }
 
    void
    write(beast::severities::Severity level, std::string const& text) override
    {
        if (level < threshold())
            return;
 
        std::cout << clock_.now().time_since_epoch().count() << " " << text
                  << std::endl;
    }
 
    void
    writeAlways(beast::severities::Severity level, std::string const& text)
        override
    {
        std::cout << clock_.now().time_since_epoch().count() << " " << text
                  << std::endl;
    }
};
 
class Sim
{
    // Use a deque to have stable pointers even when dynamically adding peers
    //  - Alternatively consider using unique_ptrs allocated from arena
    std::deque<Peer> peers;
    PeerGroup allPeers;
 
public:
    std::mt19937_64 rng;
    Scheduler scheduler;
    BasicSink sink;
    beast::Journal j;
    LedgerOracle oracle;
    BasicNetwork<Peer*> net;
    TrustGraph<Peer*> trustGraph;
    CollectorRefs collectors;
 
    Sim() : sink{scheduler.clock()}, j{sink}, net{scheduler}
    {
    }
 
    PeerGroup
    createGroup(std::size_t numPeers)
    {
        std::vector<Peer*> newPeers;
        newPeers.reserve(numPeers);
        for (std::size_t i = 0; i < numPeers; ++i)
        {
            peers.emplace_back(
                PeerID{static_cast<std::uint32_t>(peers.size())},
                scheduler,
                oracle,
                net,
                trustGraph,
                collectors,
                j);
            newPeers.emplace_back(&peers.back());
        }
        PeerGroup res{newPeers};
        allPeers = allPeers + res;
        return res;
    }
 
    std::size_t
    size() const
    {
        return peers.size();
    }
 
    void
    run(int ledgers);
 
    void
    run(SimDuration const& dur);
 
    bool
    synchronized(PeerGroup const& g) const;
 
    bool
    synchronized() const;
 
    std::size_t
    branches(PeerGroup const& g) const;
 
    std::size_t
    branches() const;
};
 
}  // namespace csf
}  // namespace test
}  // namespace ripple
 
#endif