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icinga2/lib/perfdata/elasticwriter.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/) *
* *
* 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 "perfdata/elasticwriter.hpp"
#include "perfdata/elasticwriter.tcpp"
#include "remote/url.hpp"
#include "remote/httprequest.hpp"
#include "remote/httpresponse.hpp"
#include "icinga/compatutility.hpp"
#include "icinga/service.hpp"
#include "icinga/checkcommand.hpp"
#include "base/tcpsocket.hpp"
#include "base/stream.hpp"
#include "base/base64.hpp"
#include "base/json.hpp"
#include "base/utility.hpp"
#include "base/networkstream.hpp"
#include "base/perfdatavalue.hpp"
#include "base/exception.hpp"
#include "base/statsfunction.hpp"
#include <boost/algorithm/string.hpp>
using namespace icinga;
REGISTER_TYPE(ElasticWriter);
REGISTER_STATSFUNCTION(ElasticWriter, &ElasticWriter::StatsFunc);
ElasticWriter::ElasticWriter(void)
: m_WorkQueue(10000000, 1)
{ }
void ElasticWriter::OnConfigLoaded(void)
{
ObjectImpl<ElasticWriter>::OnConfigLoaded();
m_WorkQueue.SetName("ElasticWriter, " + GetName());
}
void ElasticWriter::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata)
{
Dictionary::Ptr nodes = new Dictionary();
for (const ElasticWriter::Ptr& elasticwriter : ConfigType::GetObjectsByType<ElasticWriter>()) {
size_t workQueueItems = elasticwriter->m_WorkQueue.GetLength();
double workQueueItemRate = elasticwriter->m_WorkQueue.GetTaskCount(60) / 60.0;
Dictionary::Ptr stats = new Dictionary();
stats->Set("work_queue_items", workQueueItems);
stats->Set("work_queue_item_rate", workQueueItemRate);
nodes->Set(elasticwriter->GetName(), stats);
perfdata->Add(new PerfdataValue("elasticwriter_" + elasticwriter->GetName() + "_work_queue_items", workQueueItems));
perfdata->Add(new PerfdataValue("elasticwriter_" + elasticwriter->GetName() + "_work_queue_item_rate", workQueueItemRate));
}
status->Set("elasticwriter", nodes);
}
void ElasticWriter::Start(bool runtimeCreated)
{
ObjectImpl<ElasticWriter>::Start(runtimeCreated);
m_EventPrefix = "icinga2.event.";
Log(LogInformation, "ElasticWriter")
<< "'" << GetName() << "' started.";
m_WorkQueue.SetExceptionCallback(boost::bind(&ElasticWriter::ExceptionHandler, this, _1));
/* Setup timer for periodically flushing m_DataBuffer */
m_FlushTimer = new Timer();
m_FlushTimer->SetInterval(GetFlushInterval());
m_FlushTimer->OnTimerExpired.connect(boost::bind(&ElasticWriter::FlushTimeout, this));
m_FlushTimer->Start();
m_FlushTimer->Reschedule(0);
/* Register for new metrics. */
Checkable::OnNewCheckResult.connect(boost::bind(&ElasticWriter::CheckResultHandler, this, _1, _2));
Checkable::OnStateChange.connect(boost::bind(&ElasticWriter::StateChangeHandler, this, _1, _2, _3));
Checkable::OnNotificationSentToAllUsers.connect(boost::bind(&ElasticWriter::NotificationSentToAllUsersHandler, this, _1, _2, _3, _4, _5, _6, _7));
}
void ElasticWriter::Stop(bool runtimeRemoved)
{
Log(LogInformation, "ElasticWriter")
<< "'" << GetName() << "' stopped.";
m_WorkQueue.Join();
ObjectImpl<ElasticWriter>::Stop(runtimeRemoved);
}
void ElasticWriter::AddCheckResult(const Dictionary::Ptr& fields, const Checkable::Ptr& checkable, const CheckResult::Ptr& cr)
{
String prefix = "check_result.";
fields->Set(prefix + "output", cr->GetOutput());
fields->Set(prefix + "check_source", cr->GetCheckSource());
fields->Set(prefix + "exit_status", cr->GetExitStatus());
fields->Set(prefix + "command", cr->GetCommand());
fields->Set(prefix + "state", cr->GetState());
fields->Set(prefix + "vars_before", cr->GetVarsBefore());
fields->Set(prefix + "vars_after", cr->GetVarsAfter());
fields->Set(prefix + "execution_start", FormatTimestamp(cr->GetExecutionStart()));
fields->Set(prefix + "execution_end", FormatTimestamp(cr->GetExecutionEnd()));
fields->Set(prefix + "schedule_start", FormatTimestamp(cr->GetScheduleStart()));
fields->Set(prefix + "schedule_end", FormatTimestamp(cr->GetScheduleEnd()));
/* Add extra calculated field. */
fields->Set(prefix + "latency", cr->CalculateLatency());
fields->Set(prefix + "execution_time", cr->CalculateExecutionTime());
if (!GetEnableSendPerfdata())
return;
Array::Ptr perfdata = cr->GetPerformanceData();
if (perfdata) {
ObjectLock olock(perfdata);
for (const Value& val : perfdata) {
PerfdataValue::Ptr pdv;
if (val.IsObjectType<PerfdataValue>())
pdv = val;
else {
try {
pdv = PerfdataValue::Parse(val);
} catch (const std::exception&) {
Log(LogWarning, "ElasticWriter")
<< "Ignoring invalid perfdata value: '" << val << "' for object '"
<< checkable->GetName() << "'.";
}
}
String escapedKey = pdv->GetLabel();
boost::replace_all(escapedKey, " ", "_");
boost::replace_all(escapedKey, ".", "_");
boost::replace_all(escapedKey, "\\", "_");
boost::algorithm::replace_all(escapedKey, "::", ".");
String perfdataPrefix = prefix + "perfdata." + escapedKey;
fields->Set(perfdataPrefix + ".value", pdv->GetValue());
if (pdv->GetMin())
fields->Set(perfdataPrefix + ".min", pdv->GetMin());
if (pdv->GetMax())
fields->Set(perfdataPrefix + ".max", pdv->GetMax());
if (pdv->GetWarn())
fields->Set(perfdataPrefix + ".warn", pdv->GetWarn());
if (pdv->GetCrit())
fields->Set(perfdataPrefix + ".crit", pdv->GetCrit());
}
}
}
void ElasticWriter::CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr)
{
m_WorkQueue.Enqueue(boost::bind(&ElasticWriter::InternalCheckResultHandler, this, checkable, cr));
}
void ElasticWriter::InternalCheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr)
{
AssertOnWorkQueue();
CONTEXT("Elasticwriter processing check result for '" + checkable->GetName() + "'");
if (!IcingaApplication::GetInstance()->GetEnablePerfdata() || !checkable->GetEnablePerfdata())
return;
Host::Ptr host;
Service::Ptr service;
boost::tie(host, service) = GetHostService(checkable);
Dictionary::Ptr fields = new Dictionary();
if (service) {
fields->Set("service", service->GetShortName());
fields->Set("state", service->GetState());
fields->Set("last_state", service->GetLastState());
fields->Set("last_hard_state", service->GetLastHardState());
} else {
fields->Set("state", host->GetState());
fields->Set("last_state", host->GetLastState());
fields->Set("last_hard_state", host->GetLastHardState());
}
fields->Set("host", host->GetName());
fields->Set("state_type", checkable->GetStateType());
fields->Set("current_check_attempt", checkable->GetCheckAttempt());
fields->Set("max_check_attempts", checkable->GetMaxCheckAttempts());
fields->Set("reachable", checkable->IsReachable());
CheckCommand::Ptr commandObj = checkable->GetCheckCommand();
if (commandObj)
fields->Set("check_command", commandObj->GetName());
double ts = Utility::GetTime();
if (cr) {
AddCheckResult(fields, checkable, cr);
ts = cr->GetExecutionEnd();
}
Enqueue("checkresult", fields, ts);
}
void ElasticWriter::StateChangeHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, StateType type)
{
m_WorkQueue.Enqueue(boost::bind(&ElasticWriter::StateChangeHandlerInternal, this, checkable, cr, type));
}
void ElasticWriter::StateChangeHandlerInternal(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, StateType type)
{
AssertOnWorkQueue();
CONTEXT("Elasticwriter processing state change '" + checkable->GetName() + "'");
Host::Ptr host;
Service::Ptr service;
tie(host, service) = GetHostService(checkable);
Dictionary::Ptr fields = new Dictionary();
fields->Set("current_check_attempt", checkable->GetCheckAttempt());
fields->Set("max_check_attempts", checkable->GetMaxCheckAttempts());
fields->Set("host", host->GetName());
if (service) {
fields->Set("service", service->GetShortName());
fields->Set("state", service->GetState());
fields->Set("last_state", service->GetLastState());
fields->Set("last_hard_state", service->GetLastHardState());
} else {
fields->Set("state", host->GetState());
fields->Set("last_state", host->GetLastState());
fields->Set("last_hard_state", host->GetLastHardState());
}
CheckCommand::Ptr commandObj = checkable->GetCheckCommand();
if (commandObj)
fields->Set("check_command", commandObj->GetName());
double ts = Utility::GetTime();
if (cr) {
AddCheckResult(fields, checkable, cr);
ts = cr->GetExecutionEnd();
}
Enqueue("statechange", fields, ts);
}
void ElasticWriter::NotificationSentToAllUsersHandler(const Notification::Ptr& notification,
const Checkable::Ptr& checkable, const std::set<User::Ptr>& users, NotificationType type,
const CheckResult::Ptr& cr, const String& author, const String& text)
{
m_WorkQueue.Enqueue(boost::bind(&ElasticWriter::NotificationSentToAllUsersHandlerInternal, this,
notification, checkable, users, type, cr, author, text));
}
void ElasticWriter::NotificationSentToAllUsersHandlerInternal(const Notification::Ptr& notification,
const Checkable::Ptr& checkable, const std::set<User::Ptr>& users, NotificationType type,
const CheckResult::Ptr& cr, const String& author, const String& text)
{
AssertOnWorkQueue();
CONTEXT("Elasticwriter processing notification to all users '" + checkable->GetName() + "'");
Log(LogDebug, "ElasticWriter")
<< "Processing notification for '" << checkable->GetName() << "'";
Host::Ptr host;
Service::Ptr service;
tie(host, service) = GetHostService(checkable);
String notificationTypeString = Notification::NotificationTypeToString(type);
Dictionary::Ptr fields = new Dictionary();
if (service) {
fields->Set("service", service->GetShortName());
fields->Set("state", service->GetState());
fields->Set("last_state", service->GetLastState());
fields->Set("last_hard_state", service->GetLastHardState());
} else {
fields->Set("state", host->GetState());
fields->Set("last_state", host->GetLastState());
fields->Set("last_hard_state", host->GetLastHardState());
}
fields->Set("host", host->GetName());
Array::Ptr userNames = new Array();
for (const User::Ptr& user : users) {
userNames->Add(user->GetName());
}
fields->Set("users", userNames);
fields->Set("notification_type", notificationTypeString);
fields->Set("author", author);
fields->Set("text", text);
CheckCommand::Ptr commandObj = checkable->GetCheckCommand();
if (commandObj)
fields->Set("check_command", commandObj->GetName());
double ts = Utility::GetTime();
if (cr) {
AddCheckResult(fields, checkable, cr);
ts = cr->GetExecutionEnd();
}
Enqueue("notification", fields, ts);
}
void ElasticWriter::Enqueue(String type, const Dictionary::Ptr& fields, double ts)
{
/* Atomically buffer the data point. */
boost::mutex::scoped_lock lock(m_DataBufferMutex);
/* Format the timestamps to dynamically select the date datatype inside the index. */
fields->Set("@timestamp", FormatTimestamp(ts));
fields->Set("timestamp", FormatTimestamp(ts));
String eventType = m_EventPrefix + type;
fields->Set("type", eventType);
/* Every payload needs a line describing the index above.
* We do it this way to avoid problems with a near full queue.
*/
String indexBody = "{ \"index\" : { \"_type\" : \"" + eventType + "\" } }\n";
String fieldsBody = JsonEncode(fields);
Log(LogDebug, "ElasticWriter")
<< "Add to fields to message list: '" << fieldsBody << "'.";
m_DataBuffer.push_back(indexBody + fieldsBody);
/* Flush if we've buffered too much to prevent excessive memory use. */
if (static_cast<int>(m_DataBuffer.size()) >= GetFlushThreshold()) {
Log(LogDebug, "ElasticWriter")
<< "Data buffer overflow writing " << m_DataBuffer.size() << " data points";
Flush();
}
}
void ElasticWriter::FlushTimeout(void)
{
/* Prevent new data points from being added to the array, there is a
* race condition where they could disappear.
*/
boost::mutex::scoped_lock lock(m_DataBufferMutex);
/* Flush if there are any data available. */
if (m_DataBuffer.size() > 0) {
Log(LogDebug, "ElasticWriter")
<< "Timer expired writing " << m_DataBuffer.size() << " data points";
Flush();
}
}
void ElasticWriter::Flush(void)
{
/* Ensure you hold a lock against m_DataBuffer so that things
* don't go missing after creating the body and clearing the buffer.
*/
String body = boost::algorithm::join(m_DataBuffer, "\n");
m_DataBuffer.clear();
SendRequest(body);
}
void ElasticWriter::SendRequest(const String& body)
{
Url::Ptr url = new Url();
url->SetScheme(GetEnableTls() ? "https" : "http");
url->SetHost(GetHost());
url->SetPort(GetPort());
std::vector<String> path;
/* Specify the index path. Best practice is a daily rotation.
* Example: http://localhost:9200/icinga2-2017.09.11?pretty=1
*/
path.push_back(GetIndex() + "-" + Utility::FormatDateTime("%Y.%m.%d", Utility::GetTime()));
/* Use the bulk message format. */
path.push_back("_bulk");
url->SetPath(path);
Stream::Ptr stream = Connect();
HttpRequest req(stream);
/* Specify required headers by Elasticsearch. */
req.AddHeader("Accept", "application/json");
req.AddHeader("Content-Type", "application/json");
/* Send authentication if configured. */
String username = GetUsername();
String password = GetPassword();
if (!username.IsEmpty() && !password.IsEmpty())
req.AddHeader("Authorization", "Basic " + Base64::Encode(username + ":" + password));
req.RequestMethod = "POST";
req.RequestUrl = url;
/* Don't log the request body to debug log, this is already done above. */
Log(LogDebug, "ElasticWriter")
<< "Sending " << req.RequestMethod << " request" << ((!username.IsEmpty() && !password.IsEmpty()) ? " with basic auth" : "" )
<< " to '" << url->Format() << "'.";
try {
req.WriteBody(body.CStr(), body.GetLength());
req.Finish();
} catch (const std::exception& ex) {
Log(LogWarning, "ElasticWriter")
<< "Cannot write to HTTP API on host '" << GetHost() << "' port '" << GetPort() << "'.";
throw ex;
}
HttpResponse resp(stream, req);
StreamReadContext context;
try {
resp.Parse(context, true);
} catch (const std::exception& ex) {
Log(LogWarning, "ElasticWriter")
<< "Cannot read from HTTP API on host '" << GetHost() << "' port '" << GetPort() << "'.";
throw ex;
}
if (resp.StatusCode > 299) {
if (resp.StatusCode == 401) {
/* More verbose error logging with Elasticsearch is hidden behind a proxy. */
if (!username.IsEmpty() && !password.IsEmpty()) {
Log(LogCritical, "ElasticWriter")
<< "401 Unauthorized. Please ensure that the user '" << username
<< "' is able to authenticate against the HTTP API/Proxy.";
} else {
Log(LogCritical, "ElasticWriter")
<< "401 Unauthorized. The HTTP API requires authentication but no username/password has been configured.";
}
return;
}
Log(LogWarning, "ElasticWriter")
<< "Unexpected response code " << resp.StatusCode;
/* Finish parsing the headers and body. */
while (!resp.Complete)
resp.Parse(context, true);
String contentType = resp.Headers->Get("content-type");
if (contentType != "application/json") {
Log(LogWarning, "ElasticWriter")
<< "Unexpected Content-Type: " << contentType;
return;
}
size_t responseSize = resp.GetBodySize();
boost::scoped_array<char> buffer(new char[responseSize + 1]);
resp.ReadBody(buffer.get(), responseSize);
buffer.get()[responseSize] = '\0';
Dictionary::Ptr jsonResponse;
try {
jsonResponse = JsonDecode(buffer.get());
} catch (...) {
Log(LogWarning, "ElasticWriter")
<< "Unable to parse JSON response:\n" << buffer.get();
return;
}
String error = jsonResponse->Get("error");
Log(LogCritical, "ElasticWriter")
<< "Elasticsearch error message:\n" << error;
}
}
Stream::Ptr ElasticWriter::Connect(void)
{
TcpSocket::Ptr socket = new TcpSocket();
Log(LogNotice, "ElasticWriter")
<< "Connecting to Elasticsearch on host '" << GetHost() << "' port '" << GetPort() << "'.";
try {
socket->Connect(GetHost(), GetPort());
} catch (const std::exception& ex) {
Log(LogWarning, "ElasticWriter")
<< "Can't connect to Elasticsearch on host '" << GetHost() << "' port '" << GetPort() << "'.";
throw ex;
}
if (GetEnableTls()) {
boost::shared_ptr<SSL_CTX> sslContext;
try {
sslContext = MakeSSLContext(GetCertPath(), GetKeyPath(), GetCaPath());
} catch (const std::exception& ex) {
Log(LogWarning, "ElasticWriter")
<< "Unable to create SSL context.";
throw ex;
}
TlsStream::Ptr tlsStream = new TlsStream(socket, GetHost(), RoleClient, sslContext);
try {
tlsStream->Handshake();
} catch (const std::exception& ex) {
Log(LogWarning, "ElasticWriter")
<< "TLS handshake with host '" << GetHost() << "' on port " << GetPort() << " failed.";
throw ex;
}
return tlsStream;
} else {
return new NetworkStream(socket);
}
}
void ElasticWriter::AssertOnWorkQueue(void)
{
ASSERT(m_WorkQueue.IsWorkerThread());
}
void ElasticWriter::ExceptionHandler(boost::exception_ptr exp)
{
Log(LogCritical, "ElasticWriter", "Exception during Elastic operation: Verify that your backend is operational!");
Log(LogDebug, "ElasticWriter")
<< "Exception during Elasticsearch operation: " << DiagnosticInformation(exp);
}
String ElasticWriter::FormatTimestamp(double ts)
{
/* The date format must match the default dynamic date detection
* pattern in indexes. This enables applications like Kibana to
* detect a qualified timestamp index for time-series data.
*
* Example: 2017-09-11T10:56:21.463+0200
*
* References:
* https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic-field-mapping.html#date-detection
* https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html
* https://www.elastic.co/guide/en/elasticsearch/reference/current/date.html
*/
int milliSeconds = static_cast<int>((ts - static_cast<int>(ts)) * 1000);
return Utility::FormatDateTime("%Y-%m-%dT%H:%M:%S", ts) + "." + String(milliSeconds) + Utility::FormatDateTime("%z", ts);
}
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