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/*
* Copyright (C) 2008-2017 TrinityCore <http://www.trinitycore.org/>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "Metric.h"
#include "Log.h"
#include "Config.h"
#include "Util.h"
void Metric::Initialize(std::string const& realmName, boost::asio::io_service& ioService, std::function<void()> overallStatusLogger)
{
_realmName = FormatInfluxDBTagValue(realmName);
_batchTimer = Trinity::make_unique<boost::asio::deadline_timer>(ioService);
_overallStatusTimer = Trinity::make_unique<boost::asio::deadline_timer>(ioService);
_overallStatusLogger = overallStatusLogger;
LoadFromConfigs();
}
bool Metric::Connect()
{
_dataStream.connect(_hostname, _port);
auto error = _dataStream.error();
if (error)
{
TC_LOG_ERROR("metric", "Error connecting to '%s:%s', disabling Metric. Error message : %s",
_hostname.c_str(), _port.c_str(), error.message().c_str());
_enabled = false;
return false;
}
_dataStream.clear();
return true;
}
void Metric::LoadFromConfigs()
{
bool previousValue = _enabled;
_enabled = sConfigMgr->GetBoolDefault("Metric.Enable", false);
_updateInterval = sConfigMgr->GetIntDefault("Metric.Interval", 10);
if (_updateInterval < 1)
{
TC_LOG_ERROR("metric", "'Metric.Interval' config set to %d, overriding to 1.", _updateInterval);
_updateInterval = 1;
}
_overallStatusTimerInterval = sConfigMgr->GetIntDefault("Metric.OverallStatusInterval", 1);
if (_overallStatusTimerInterval < 1)
{
TC_LOG_ERROR("metric", "'Metric.OverallStatusInterval' config set to %d, overriding to 1.", _overallStatusTimerInterval);
_overallStatusTimerInterval = 1;
}
// Schedule a send at this point only if the config changed from Disabled to Enabled.
// Cancel any scheduled operation if the config changed from Enabled to Disabled.
if (_enabled && !previousValue)
{
std::string connectionInfo = sConfigMgr->GetStringDefault("Metric.ConnectionInfo", "");
if (connectionInfo.empty())
{
TC_LOG_ERROR("metric", "'Metric.ConnectionInfo' not specified in configuration file.");
return;
}
Tokenizer tokens(connectionInfo, ';');
if (tokens.size() != 3)
{
TC_LOG_ERROR("metric", "'Metric.ConnectionInfo' specified with wrong format in configuration file.");
return;
}
_hostname.assign(tokens[0]);
_port.assign(tokens[1]);
_databaseName.assign(tokens[2]);
Connect();
ScheduleSend();
ScheduleOverallStatusLog();
}
}
void Metric::Update()
{
if (_overallStatusTimerTriggered)
{
_overallStatusTimerTriggered = false;
_overallStatusLogger();
}
}
void Metric::LogEvent(std::string const& category, std::string const& title, std::string const& description)
{
using namespace std::chrono;
MetricData* data = new MetricData;
data->Category = category;
data->Timestamp = system_clock::now();
data->Type = METRIC_DATA_EVENT;
data->Title = title;
data->Text = description;
_queuedData.Enqueue(data);
}
void Metric::SendBatch()
{
using namespace std::chrono;
std::stringstream batchedData;
MetricData* data;
bool firstLoop = true;
while (_queuedData.Dequeue(data))
{
if (!firstLoop)
batchedData << "\n";
batchedData << data->Category;
if (!_realmName.empty())
batchedData << ",realm=" << _realmName;
batchedData << " ";
switch (data->Type)
{
case METRIC_DATA_VALUE:
batchedData << "value=" << data->Value;
break;
case METRIC_DATA_EVENT:
batchedData << "title=\"" << data->Title << "\",text=\"" << data->Text << "\"";
break;
}
batchedData << " ";
batchedData << std::to_string(duration_cast<nanoseconds>(data->Timestamp.time_since_epoch()).count());
firstLoop = false;
delete data;
}
// Check if there's any data to send
if (batchedData.tellp() == std::streampos(0))
{
ScheduleSend();
return;
}
if (!_dataStream.good() && !Connect())
return;
_dataStream << "POST " << "/write?db=" << _databaseName << " HTTP/1.1\r\n";
_dataStream << "Host: " << _hostname << ":" << _port << "\r\n";
_dataStream << "Accept: */*\r\n";
_dataStream << "Content-Type: application/octet-stream\r\n";
_dataStream << "Content-Transfer-Encoding: binary\r\n";
_dataStream << "Content-Length: " << std::to_string(batchedData.tellp()) << "\r\n\r\n";
_dataStream << batchedData.rdbuf();
std::string http_version;
_dataStream >> http_version;
unsigned int status_code = 0;
_dataStream >> status_code;
if (status_code != 204)
{
TC_LOG_ERROR("metric", "Error sending data, returned HTTP code: %u", status_code);
}
// Read and ignore the status description
std::string status_description;
std::getline(_dataStream, status_description);
// Read headers
std::string header;
while (std::getline(_dataStream, header) && header != "\r")
{
if (header == "Connection: close\r")
_dataStream.close();
}
ScheduleSend();
}
void Metric::ScheduleSend()
{
if (_enabled)
{
_batchTimer->expires_from_now(boost::posix_time::seconds(_updateInterval));
_batchTimer->async_wait(std::bind(&Metric::SendBatch, this));
}
else
{
_dataStream.close();
MetricData* data;
// Clear the queue
while (_queuedData.Dequeue(data))
;
}
}
void Metric::ForceSend()
{
// Send what's queued only if io_service is stopped (so only on shutdown)
if (_enabled && _batchTimer->get_io_service().stopped())
SendBatch();
}
void Metric::ScheduleOverallStatusLog()
{
if (_enabled)
{
_overallStatusTimer->expires_from_now(boost::posix_time::seconds(_overallStatusTimerInterval));
_overallStatusTimer->async_wait([this](const boost::system::error_code&)
{
_overallStatusTimerTriggered = true;
ScheduleOverallStatusLog();
});
}
}
Metric* Metric::instance()
{
static Metric instance;
return &instance;
}
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