rstudio/src/cpp/session/modules/SessionFilesQuotas.cpp at master · pearsonca/rstudio · GitHub

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* SessionFilesQuotas.cpp

* Unless you have received this program directly from RStudio pursuant

* to the terms of a commercial license agreement with RStudio, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#include "SessionFilesQuotas.hpp"

#include <iostream>

#include <boost/tokenizer.hpp>

#include <boost/lexical_cast.hpp>

#include <boost/numeric/conversion/cast.hpp>

#include <core/BoostThread.hpp>

#include <shared_core/Error.hpp>

#include <core/BoostErrors.hpp>

#include <core/Log.hpp>

#include <core/system/Process.hpp>

#include <r/RExec.hpp>

#include <session/SessionModuleContext.hpp>

using namespace rstudio::core ;

namespace rstudio {

namespace session {

namespace modules {

namespace files {

namespace quotas {

namespace {

// does the system have quotas?

bool s_systemHasQuotas = false;

struct QuotaInfo

{

typedef long long size_type;

QuotaInfo()

: hasQuota(false), used(0), quota(0), limit(0)

{

}

bool hasQuota;

size_type used;

size_type quota;

size_type limit;

};

void quotaInfoToJson(const QuotaInfo& quotaInfo,

json::Object* pQuotaInfoJson)

{

// first get the data into json serializable types

double used = 0;

double quota = 0;

double limit = 0;

try

{

used = boost::numeric_cast<double>(quotaInfo.used);

quota = boost::numeric_cast<double>(quotaInfo.quota);

limit = boost::numeric_cast<double>(quotaInfo.limit);

}

catch(boost::numeric::bad_numeric_cast& e)

{

LOG_ERROR_MESSAGE(std::string("Error converting quota info to double: ") +

e.what());

}

// write to json

json::Object& quotaInfoJson = *pQuotaInfoJson;

quotaInfoJson["used"] = used;

quotaInfoJson["quota"] = quota;

quotaInfoJson["limit"] = limit;

}

QuotaInfo::size_type quotaBytes(const std::string& quotaKb)

{

QuotaInfo::size_type kb = boost::lexical_cast<QuotaInfo::size_type>(quotaKb);

return kb * 1024L;

}

Error parseQuotaInfo(const std::string& quotaInfo, QuotaInfo* pInfo)

{

// if there was no quota info returned then there is no quota on this box

if (quotaInfo.empty())

{

pInfo->hasQuota = false;

return Success();

}

// tokenzie results and seek quota info

int resultIndex = 0;

boost::char_separator<char> sep(" \t");

typedef boost::tokenizer<boost::char_separator<char> > QuotaInfoTokenizer;

QuotaInfoTokenizer tok(quotaInfo, sep);

for (QuotaInfoTokenizer::const_iterator it = tok.begin();

it != tok.end();

++it)

{

try

{

switch(resultIndex++)

{

// ingore first entry (device)

case 0:

break;

// Used

case 1:

pInfo->used = quotaBytes(*it);

break;

// Quota

case 2:

pInfo->quota = quotaBytes(*it);

break;

// Limit

case 3:

pInfo->limit = quotaBytes(*it);

pInfo->hasQuota = true;

break;

}

catch(boost::bad_lexical_cast&)

{

return systemError(boost::system::errc::result_out_of_range,

ERROR_LOCATION);

}

// out of here....

if (pInfo->hasQuota)

break;

}

// make sure we got all of the results

if (!pInfo->hasQuota)

{

return systemError(boost::system::errc::result_out_of_range,

ERROR_LOCATION);

}

else

{

return Success();

}

void checkQuotaThread()

{

try

{

// run the command

core::system::ProcessResult result;

Error error = runCommand("xfs_quota -c 'quota -N'",

core::system::ProcessOptions(),

&result);

if (error)

{

LOG_ERROR(error);

return;

}

// parse output

QuotaInfo quotaInfo;

error = parseQuotaInfo(result.stdOut, &quotaInfo);

if (error)

{

LOG_ERROR(error);

return;

}

// send event only if there are quotas established

if (quotaInfo.hasQuota)

{

json::Object quotaInfoJson;

quotaInfoToJson(quotaInfo, &quotaInfoJson);

ClientEvent event(client_events::kQuotaStatus, quotaInfoJson);

module_context::enqueClientEvent(event);

}

CATCH_UNEXPECTED_EXCEPTION

}

} // anonymous namespace

Error initialize()

{

// one time initialization of s_systemHasQuotas

if ( (session::options().programMode() == kSessionProgramModeServer) &&

session::options().limitXfsDiskQuota() )

{

std::string out;

Error error = r::exec::system("which xfs_quota", &out);

s_systemHasQuotas = !out.empty();

}

else

{

s_systemHasQuotas = false;

}

return Success();

}

void checkQuotaStatus()

{

if (s_systemHasQuotas)

{

try

{

// block all signals for launch of background thread (will cause it

// to never receive signals)

core::system::SignalBlocker signalBlocker;

Error error = signalBlocker.blockAll();

if (error)

LOG_ERROR(error);

boost::thread t(checkQuotaThread);

}

catch(const boost::thread_resource_error& e)

{

LOG_ERROR(Error(boost::thread_error::ec_from_exception(e),

ERROR_LOCATION));

}

} // namespace quotas

} // namespace files

} // namespace modules

} // namespace session

} // namespace rstudio

rstudio/src/cpp/session/modules/SessionFilesQuotas.cpp at master · pearsonca/rstudio · GitHub

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