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icinga2/components/livestatus/query.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 Icinga Development Team (http://www.icinga.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, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "livestatus/query.h"
#include "livestatus/countaggregator.h"
#include "livestatus/sumaggregator.h"
#include "livestatus/minaggregator.h"
#include "livestatus/maxaggregator.h"
#include "livestatus/avgaggregator.h"
#include "livestatus/stdaggregator.h"
#include "livestatus/invsumaggregator.h"
#include "livestatus/invavgaggregator.h"
#include "livestatus/attributefilter.h"
#include "livestatus/negatefilter.h"
#include "livestatus/orfilter.h"
#include "livestatus/andfilter.h"
#include "icinga/externalcommandprocessor.h"
#include "base/utility.h"
#include "base/convert.h"
#include "base/objectlock.h"
#include "base/logger_fwd.h"
#include "base/exception.h"
#include <boost/algorithm/string/classification.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <boost/foreach.hpp>
#include <boost/algorithm/string/split.hpp>
using namespace icinga;
using namespace livestatus;
static int l_ExternalCommands = 0;
static boost::mutex l_QueryMutex;
Query::Query(const std::vector<String>& lines)
: m_KeepAlive(false), m_OutputFormat("csv"), m_ColumnHeaders(true), m_Limit(-1)
{
if (lines.size() == 0) {
m_Verb = "ERROR";
m_ErrorCode = LivestatusErrorQuery;
m_ErrorMessage = "Empty Query. Aborting.";
return;
}
String line = lines[0];
size_t sp_index = line.FindFirstOf(" ");
if (sp_index == String::NPos)
BOOST_THROW_EXCEPTION(std::runtime_error("Livestatus header must contain a verb."));
String verb = line.SubStr(0, sp_index);
String target = line.SubStr(sp_index + 1);
m_Verb = verb;
if (m_Verb == "COMMAND") {
m_Command = target;
} else if (m_Verb == "GET") {
m_Table = target;
} else {
m_Verb = "ERROR";
m_ErrorCode = LivestatusErrorQuery;
m_ErrorMessage = "Unknown livestatus verb: " + m_Verb;
return;
}
std::deque<Filter::Ptr> filters, stats;
std::deque<Aggregator::Ptr> aggregators;
for (unsigned int i = 1; i < lines.size(); i++) {
line = lines[i];
size_t col_index = line.FindFirstOf(":");
String header = line.SubStr(0, col_index);
String params;
if (line.GetLength() > col_index + 2)
params = line.SubStr(col_index + 2);
if (header == "ResponseHeader")
m_ResponseHeader = params;
else if (header == "OutputFormat")
m_OutputFormat = params;
else if (header == "Columns")
boost::algorithm::split(m_Columns, params, boost::is_any_of(" "));
else if (header == "ColumnHeaders")
m_ColumnHeaders = (params == "on");
else if (header == "Filter") {
Filter::Ptr filter = ParseFilter(params);
if (!filter) {
m_Verb = "ERROR";
m_ErrorCode = LivestatusErrorQuery;
m_ErrorMessage = "Invalid filter specification: " + line;
return;
}
filters.push_back(filter);
} else if (header == "Stats") {
std::vector<String> tokens;
boost::algorithm::split(tokens, params, boost::is_any_of(" "));
if (tokens.size() < 2) {
m_Verb = "ERROR";
m_ErrorCode = LivestatusErrorQuery;
m_ErrorMessage = "Missing aggregator column name: " + line;
return;
}
String aggregate_arg = tokens[0];
String aggregate_attr = tokens[1];
Aggregator::Ptr aggregator;
Filter::Ptr filter;
if (aggregate_arg == "sum") {
aggregator = boost::make_shared<SumAggregator>(aggregate_attr);
} else if (aggregate_arg == "min") {
aggregator = boost::make_shared<MinAggregator>(aggregate_attr);
} else if (aggregate_arg == "max") {
aggregator = boost::make_shared<MaxAggregator>(aggregate_attr);
} else if (aggregate_arg == "avg") {
aggregator = boost::make_shared<AvgAggregator>(aggregate_attr);
} else if (aggregate_arg == "std") {
aggregator = boost::make_shared<StdAggregator>(aggregate_attr);
} else if (aggregate_arg == "suminv") {
aggregator = boost::make_shared<InvSumAggregator>(aggregate_attr);
} else if (aggregate_arg == "avginv") {
aggregator = boost::make_shared<InvAvgAggregator>(aggregate_attr);
} else {
filter = ParseFilter(params);
if (!filter) {
m_Verb = "ERROR";
m_ErrorCode = LivestatusErrorQuery;
m_ErrorMessage = "Invalid filter specification: " + line;
return;
}
aggregator = boost::make_shared<CountAggregator>();
}
aggregator->SetFilter(filter);
aggregators.push_back(aggregator);
stats.push_back(filter);
} else if (header == "Or" || header == "And") {
std::deque<Filter::Ptr>& deq = (header == "Or" || header == "And") ? filters : stats;
int num = Convert::ToLong(params);
CombinerFilter::Ptr filter;
if (header == "Or" || header == "StatsOr")
filter = boost::make_shared<OrFilter>();
else
filter = boost::make_shared<AndFilter>();
if (num > deq.size()) {
m_Verb = "ERROR";
m_ErrorCode = 451;
m_ErrorMessage = "Or/StatsOr is referencing " + Convert::ToString(num) + " filters; stack only contains " + Convert::ToString(deq.size()) + " filters";
return;
}
while (num--) {
filter->AddSubFilter(deq.back());
deq.pop_back();
}
deq.push_back(filter);
} else if (header == "Negate" || header == "StatsNegate") {
std::deque<Filter::Ptr>& deq = (header == "Negate") ? filters : stats;
if (deq.empty()) {
m_Verb = "ERROR";
m_ErrorCode = 451;
m_ErrorMessage = "Negate/StatsNegate used, however the filter stack is empty";
return;
}
Filter::Ptr filter = deq.back();
deq.pop_back();
if (!filter) {
m_Verb = "ERROR";
m_ErrorCode = 451;
m_ErrorMessage = "Negate/StatsNegate used, however last stats doesn't have a filter";
return;
}
deq.push_back(boost::make_shared<NegateFilter>(filter));
if (deq == stats) {
Aggregator::Ptr aggregator = aggregators.back();
aggregator->SetFilter(filter);
}
}
}
/* Combine all top-level filters into a single filter. */
AndFilter::Ptr top_filter = boost::make_shared<AndFilter>();
BOOST_FOREACH(const Filter::Ptr& filter, filters) {
top_filter->AddSubFilter(filter);
}
m_Filter = top_filter;
m_Aggregators.swap(aggregators);
}
int Query::GetExternalCommands(void)
{
boost::mutex::scoped_lock lock(l_QueryMutex);
return l_ExternalCommands;
}
Filter::Ptr Query::ParseFilter(const String& params)
{
std::vector<String> tokens;
boost::algorithm::split(tokens, params, boost::is_any_of(" "));
if (tokens.size() == 2)
tokens.push_back("");
if (tokens.size() < 3)
return Filter::Ptr();
String op = tokens[1];
bool negate = false;
if (op == "!=") {
op = "=";
negate = true;
} else if (op == "!~") {
op = "~";
negate = true;
} else if (op == "!=~") {
op = "=~";
negate = true;
} else if (op == "!~~") {
op = "~~";
negate = true;
}
Filter::Ptr filter = boost::make_shared<AttributeFilter>(tokens[0], op, tokens[2]);
if (negate)
filter = boost::make_shared<NegateFilter>(filter);
return filter;
}
void Query::PrintResultSet(std::ostream& fp, const std::vector<String>& columns, const Array::Ptr& rs)
{
if (m_OutputFormat == "csv" && m_Columns.size() == 0 && m_ColumnHeaders) {
bool first = true;
BOOST_FOREACH(const String& column, columns) {
if (first)
first = false;
else
fp << ";";
fp << column;
}
fp << "\n";
}
if (m_OutputFormat == "csv") {
ObjectLock olock(rs);
BOOST_FOREACH(const Array::Ptr& row, rs) {
bool first = true;
ObjectLock rlock(row);
BOOST_FOREACH(const Value& value, row) {
if (first)
first = false;
else
fp << ";";
if (value.IsObjectType<Array>())
PrintCsvArray(fp, value, 0);
else
fp << Convert::ToString(value);
}
fp << "\n";
}
} else if (m_OutputFormat == "json") {
fp << Value(rs).Serialize();
}
}
void Query::PrintCsvArray(std::ostream& fp, const Array::Ptr& array, int level)
{
bool first = true;
ObjectLock olock(array);
BOOST_FOREACH(const Value& value, array) {
if (first)
first = false;
else
fp << ((level == 0) ? "," : "|");
if (value.IsObjectType<Array>())
PrintCsvArray(fp, value, level + 1);
else
fp << Convert::ToString(value);
}
}
void Query::ExecuteGetHelper(const Stream::Ptr& stream)
{
Log(LogInformation, "livestatus", "Table: " + m_Table);
Table::Ptr table = Table::GetByName(m_Table);
if (!table) {
SendResponse(stream, LivestatusErrorNotFound, "Table '" + m_Table + "' does not exist.");
return;
}
std::vector<Value> objects = table->FilterRows(m_Filter);
std::vector<String> columns;
if (m_Columns.size() > 0)
columns = m_Columns;
else
columns = table->GetColumnNames();
Array::Ptr rs = boost::make_shared<Array>();
if (m_Aggregators.empty()) {
BOOST_FOREACH(const Value& object, objects) {
Array::Ptr row = boost::make_shared<Array>();
BOOST_FOREACH(const String& columnName, columns) {
Column column = table->GetColumn(columnName);
row->Add(column.ExtractValue(object));
}
rs->Add(row);
}
} else {
std::vector<double> stats(m_Aggregators.size(), 0);
int index = 0;
BOOST_FOREACH(const Aggregator::Ptr aggregator, m_Aggregators) {
BOOST_FOREACH(const Value& object, objects) {
aggregator->Apply(table, object);
}
stats[index] = aggregator->GetResult();
index++;
}
Array::Ptr row = boost::make_shared<Array>();
for (int i = 0; i < m_Aggregators.size(); i++)
row->Add(stats[i]);
rs->Add(row);
m_ColumnHeaders = false;
}
std::ostringstream result;
PrintResultSet(result, columns, rs);
SendResponse(stream, LivestatusErrorOK, result.str());
}
void Query::ExecuteCommandHelper(const Stream::Ptr& stream)
{
{
boost::mutex::scoped_lock lock(l_QueryMutex);
l_ExternalCommands++;
}
Log(LogInformation, "livestatus", "Executing command: " + m_Command);
ExternalCommandProcessor::Execute(m_Command);
SendResponse(stream, LivestatusErrorOK, "");
}
void Query::ExecuteErrorHelper(const Stream::Ptr& stream)
{
SendResponse(stream, m_ErrorCode, m_ErrorMessage);
}
void Query::SendResponse(const Stream::Ptr& stream, int code, const String& data)
{
if (m_ResponseHeader == "fixed16")
PrintFixed16(stream, code, data);
if (m_ResponseHeader == "fixed16" || code == LivestatusErrorOK)
stream->Write(data.CStr(), data.GetLength());
}
void Query::PrintFixed16(const Stream::Ptr& stream, int code, const String& data)
{
ASSERT(code >= 100 && code <= 999);
String sCode = Convert::ToString(code);
String sLength = Convert::ToString(data.GetLength());
String header = sCode + String(16 - 3 - sLength.GetLength() - 1, ' ') + sLength + "\n";
stream->Write(header.CStr(), header.GetLength());
}
bool Query::Execute(const Stream::Ptr& stream)
{
try {
Log(LogInformation, "livestatus", "Executing livestatus query: " + m_Verb);
if (m_Verb == "GET")
ExecuteGetHelper(stream);
else if (m_Verb == "COMMAND")
ExecuteCommandHelper(stream);
else if (m_Verb == "ERROR")
ExecuteErrorHelper(stream);
else
BOOST_THROW_EXCEPTION(std::runtime_error("Invalid livestatus query verb."));
} catch (const std::exception& ex) {
StackTrace *st = Exception::GetLastStackTrace();
std::ostringstream info;
st->Print(info);
Log(LogWarning, "livestatus", info.str());
SendResponse(stream, LivestatusErrorQuery, boost::diagnostic_information(ex));
}
if (!m_KeepAlive) {
stream->Close();
return false;
}
return true;
}
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