slave.cc

/*
    Copyright (C) 2011-2013 Fredrik Danerklint

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2 as published 
    by the Free Software Foundation

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/


#include "luabackend.hh"

#include "pdns/logger.hh"
#include "pdns/arguments.hh"

/*

   virtual bool startTransaction(const string &qname, int id);
   virtual bool commitTransaction();
   virtual bool abortTransaction();
   virtual bool feedRecord(const DNSResourceRecord &rr);

   virtual bool getDomainInfo(const string &domain, DomainInfo &di);
   virtual bool isMaster(const string &name, const string &ip);
   virtual void getUnfreshSlaveInfos(vector<DomainInfo>* domains);
   virtual void setFresh(int id);
*/

bool LUABackend::startTransaction(const string &qname, int id) {

    if (f_lua_starttransaction == 0)
        return false;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(startTransaction) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_starttransaction);

    lua_pushstring(lua, qname.c_str());
    lua_pushnumber(lua, id);

    if(lua_pcall(lua, 2, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(startTransaction)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return false;
    }

    size_t returnedwhat = lua_type(lua, -1);
    bool ok = false;

    if (returnedwhat == LUA_TBOOLEAN)
        ok = lua_toboolean(lua, -1);

    lua_pop(lua, 1);

    if (logging)
        L << Logger::Info << backend_name << "(startTransaction) END" << endl;

    return ok;
}

bool LUABackend::commitTransaction() {

    if (f_lua_committransaction == 0)
        return false;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(commitTransaction) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_committransaction);

    if(lua_pcall(lua, 0, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(commitTransaction)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return false;
    }

    size_t returnedwhat = lua_type(lua, -1);
    bool ok = false;

    if (returnedwhat == LUA_TBOOLEAN)
        ok = lua_toboolean(lua, -1);

    lua_pop(lua, 1);

    if (logging)
        L << Logger::Info << backend_name << "(commitTransaction) END" << endl;

    return ok;
}

bool LUABackend::abortTransaction() {

    if (f_lua_aborttransaction == 0)
        return false;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(abortTransaction) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_aborttransaction);

    if(lua_pcall(lua, 0, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(abortTransaction)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return false;
    }

    size_t returnedwhat = lua_type(lua, -1);
    bool ok = false;

    if (returnedwhat == LUA_TBOOLEAN)
        ok = lua_toboolean(lua, -1);

    lua_pop(lua, 1);

    if (logging)
        L << Logger::Info << backend_name << "(abortTransaction) END" << endl;
    return ok;
}

bool LUABackend::feedRecord(const DNSResourceRecord &rr) {

    if (f_lua_feedrecord == 0)
        return false;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(feedRecord) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_feedrecord);
    dnsrr_to_table(lua, &rr);

    if(lua_pcall(lua, 1, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(feedRecord)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return false;
    }

    size_t returnedwhat = lua_type(lua, -1);
    bool ok = false;

    if (returnedwhat == LUA_TBOOLEAN)
        ok = lua_toboolean(lua, -1);

    lua_pop(lua, 1);

    if (logging)
        L << Logger::Info << backend_name << "(feedRecord) END" << endl;

    return ok;
}

void LUABackend::setFresh(int id) {

    if (f_lua_setfresh == 0)
        return;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(setFresh) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_setfresh);

    lua_pushnumber(lua, id);

    if(lua_pcall(lua, 1, 0, f_lua_exec_error) != 0) {
        string e = backend_name + "(setFresh)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return;
    }

    if (logging)
        L << Logger::Info << backend_name << "(setFresh) END" << endl;

}

void LUABackend::getUnfreshSlaveInfos(vector<DomainInfo>* domains) {

    if (f_lua_getunfreshslaveinfos == 0)
        return;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(getUnfreshSlaveInfos) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_getunfreshslaveinfos);

    if(lua_pcall(lua, 0, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(getUnfreshSlaveInfos)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return;
    }

    size_t returnedwhat = lua_type(lua, -1);
    if (returnedwhat != LUA_TTABLE) {
        lua_pop(lua, 1 );
        return;
    }

    domains_from_table(domains);

    if (logging)
        L << Logger::Info << backend_name << "(getUnfreshSlaveInfos) END" << endl;

}

bool LUABackend::isMaster(const string &domain, const string &ip) {

    if (f_lua_ismaster == 0)
        return false;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Error << backend_name << "(isMaster) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_ismaster);

    lua_pushstring(lua, domain.c_str());
    lua_pushstring(lua, ip.c_str());

    if(lua_pcall(lua, 2, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(isMaster)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return false;
    }

    size_t returnedwhat = lua_type(lua, -1);
    bool ok = false;

    if (returnedwhat == LUA_TBOOLEAN)
        ok = lua_toboolean(lua, -1);

    lua_pop(lua, 1);

    if (logging)
        L << Logger::Info << backend_name << "(isMaster) END" << endl;

    return ok;
}

bool LUABackend::getDomainInfo(const string &domain, DomainInfo &di) {
    if (f_lua_getdomaininfo == 0)
        return false;

    Lock l(&lock_the_lock);

    if (logging)
        L << Logger::Info << backend_name << "(getDomainInfo) BEGIN" << endl;

    lua_rawgeti(lua, LUA_REGISTRYINDEX, f_lua_getdomaininfo);

    lua_pushlstring(lua, domain.c_str(), domain.size());

    if(lua_pcall(lua, 1, 1, f_lua_exec_error) != 0) {
        string e = backend_name + "(getDomainInfo)" + lua_tostring(lua, -1);
        lua_pop(lua, 1);

        throw runtime_error(e);
        return false;
    }

    size_t returnedwhat = lua_type(lua, -1);
    if (returnedwhat != LUA_TTABLE) {
        lua_pop(lua, 1 );
        if (logging)
            L << Logger::Info << backend_name << "(getDomainInfo) END - Didn't get a table as a expected return value" << endl;
        return false;
    }

    if (logging)
        L << Logger::Info << backend_name << "(getDomainInfo) END" << endl;

    return domaininfo_from_table(&di);
}