PeerFinder.cpp

#include <xrpld/app/rdb/PeerFinder.h>
 
namespace xrpl {
 
void
initPeerFinderDB(soci::session& session, BasicConfig const& config, beast::Journal j)
{
    DBConfig m_sociConfig(config, "peerfinder");
    m_sociConfig.open(session);
 
    JLOG(j.info()) << "Opening database at '" << m_sociConfig.connectionString() << "'";
 
    soci::transaction tr(session);
    session << "PRAGMA encoding=\"UTF-8\";";
 
    session << "CREATE TABLE IF NOT EXISTS SchemaVersion ( "
               "  name             TEXT PRIMARY KEY, "
               "  version          INTEGER"
               ");";
 
    session << "CREATE TABLE IF NOT EXISTS PeerFinder_BootstrapCache ( "
               "  id       INTEGER PRIMARY KEY AUTOINCREMENT, "
               "  address  TEXT UNIQUE NOT NULL, "
               "  valence  INTEGER"
               ");";
 
    session << "CREATE INDEX IF NOT EXISTS "
               "  PeerFinder_BootstrapCache_Index ON "
               "PeerFinder_BootstrapCache "
               "  (  "
               "    address "
               "  ); ";
 
    tr.commit();
}
 
void
updatePeerFinderDB(soci::session& session, int currentSchemaVersion, beast::Journal j)
{
    soci::transaction tr(session);
    // get version
    int version(0);
    {
        // SOCI requires a boost::optional (not std::optional) parameter.
        boost::optional<int> vO;
        session << "SELECT "
                   "  version "
                   "FROM SchemaVersion WHERE "
                   "  name = 'PeerFinder';",
            soci::into(vO);
 
        version = vO.value_or(0);
 
        JLOG(j.info()) << "Opened version " << version << " database";
    }
 
    {
        if (version < currentSchemaVersion)
        {
            JLOG(j.info()) << "Updating database to version " << currentSchemaVersion;
        }
        else if (version > currentSchemaVersion)
        {
            Throw<std::runtime_error>("The PeerFinder database version is higher than expected");
        }
    }
 
    if (version < 4)
    {
        //
        // Remove the "uptime" column from the bootstrap table
        //
 
        session << "CREATE TABLE IF NOT EXISTS "
                   "PeerFinder_BootstrapCache_Next ( "
                   "  id       INTEGER PRIMARY KEY AUTOINCREMENT, "
                   "  address  TEXT UNIQUE NOT NULL, "
                   "  valence  INTEGER"
                   ");";
 
        session << "CREATE INDEX IF NOT EXISTS "
                   "  PeerFinder_BootstrapCache_Next_Index ON "
                   "    PeerFinder_BootstrapCache_Next "
                   "  ( address ); ";
 
        std::size_t count;
        session << "SELECT COUNT(*) FROM PeerFinder_BootstrapCache;", soci::into(count);
 
        std::vector<PeerFinder::Store::Entry> list;
 
        {
            list.reserve(count);
            std::string s;
            int valence;
            soci::statement st =
                (session.prepare << "SELECT "
                                    " address, "
                                    " valence "
                                    "FROM PeerFinder_BootstrapCache;",
                 soci::into(s),
                 soci::into(valence));
 
            st.execute();
            while (st.fetch())
            {
                PeerFinder::Store::Entry entry;
                entry.endpoint = beast::IP::Endpoint::from_string(s);
                if (!is_unspecified(entry.endpoint))
                {
                    entry.valence = valence;
                    list.push_back(entry);
                }
                else
                {
                    JLOG(j.error()) << "Bad address string '" << s << "' in Bootcache table";
                }
            }
        }
 
        if (!list.empty())
        {
            std::vector<std::string> s;
            std::vector<int> valence;
            s.reserve(list.size());
            valence.reserve(list.size());
 
            for (auto iter(list.cbegin()); iter != list.cend(); ++iter)
            {
                s.emplace_back(to_string(iter->endpoint));
                valence.emplace_back(iter->valence);
            }
 
            session << "INSERT INTO PeerFinder_BootstrapCache_Next ( "
                       "  address, "
                       "  valence "
                       ") VALUES ( "
                       "  :s, :valence"
                       ");",
                soci::use(s), soci::use(valence);
        }
 
        session << "DROP TABLE IF EXISTS PeerFinder_BootstrapCache;";
 
        session << "DROP INDEX IF EXISTS PeerFinder_BootstrapCache_Index;";
 
        session << "ALTER TABLE PeerFinder_BootstrapCache_Next "
                   "  RENAME TO PeerFinder_BootstrapCache;";
 
        session << "CREATE INDEX IF NOT EXISTS "
                   "  PeerFinder_BootstrapCache_Index ON "
                   "PeerFinder_BootstrapCache "
                   "  (  "
                   "    address "
                   "  ); ";
    }
 
    if (version < 3)
    {
        //
        // Remove legacy endpoints from the schema
        //
 
        session << "DROP TABLE IF EXISTS LegacyEndpoints;";
 
        session << "DROP TABLE IF EXISTS PeerFinderLegacyEndpoints;";
 
        session << "DROP TABLE IF EXISTS PeerFinder_LegacyEndpoints;";
 
        session << "DROP TABLE IF EXISTS PeerFinder_LegacyEndpoints_Index;";
    }
 
    {
        int const v(currentSchemaVersion);
        session << "INSERT OR REPLACE INTO SchemaVersion ("
                   "   name "
                   "  ,version "
                   ") VALUES ( "
                   "  'PeerFinder', :version "
                   ");",
            soci::use(v);
    }
 
    tr.commit();
}
 
void
readPeerFinderDB(soci::session& session, std::function<void(std::string const&, int)> const& func)
{
    std::string s;
    int valence;
    soci::statement st =
        (session.prepare << "SELECT "
                            " address, "
                            " valence "
                            "FROM PeerFinder_BootstrapCache;",
         soci::into(s),
         soci::into(valence));
 
    st.execute();
    while (st.fetch())
    {
        func(s, valence);
    }
}
 
void
savePeerFinderDB(soci::session& session, std::vector<PeerFinder::Store::Entry> const& v)
{
    soci::transaction tr(session);
    session << "DELETE FROM PeerFinder_BootstrapCache;";
 
    if (!v.empty())
    {
        std::vector<std::string> s;
        std::vector<int> valence;
        s.reserve(v.size());
        valence.reserve(v.size());
 
        for (auto const& e : v)
        {
            s.emplace_back(to_string(e.endpoint));
            valence.emplace_back(e.valence);
        }
 
        session << "INSERT INTO PeerFinder_BootstrapCache ( "
                   "  address, "
                   "  valence "
                   ") VALUES ( "
                   "  :s, :valence "
                   ");",
            soci::use(s), soci::use(valence);
    }
 
    tr.commit();
}
 
}  // namespace xrpl