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Merge pull request #9247 from Icinga/bugfix/influxdb-writer-synchronization-212

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Fix unsafe concurrent access to m_DataBuffer in InfluxdbWriter
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Julian Brost 2022-03-01 15:07:48 +01:00 committed by GitHub
commit 0ccd7b799c
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2 changed files with 15 additions and 18 deletions
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27
lib/perfdata/influxdbwriter.cpp
View File

@ -89,7 +89,7 @@ void InfluxdbWriter::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr&
for (const InfluxdbWriter::Ptr& influxdbwriter : ConfigType::GetObjectsByType<InfluxdbWriter>()) {
size_t workQueueItems = influxdbwriter->m_WorkQueue.GetLength();
double workQueueItemRate = influxdbwriter->m_WorkQueue.GetTaskCount(60) / 60.0;
size_t dataBufferItems = influxdbwriter->m_DataBuffer.size();
size_t dataBufferItems = influxdbwriter->m_DataBufferSize;
nodes.emplace_back(influxdbwriter->GetName(), new Dictionary({
{ "work_queue_items", workQueueItems },
@ -131,22 +131,13 @@ void InfluxdbWriter::Pause()
{
/* Force a flush. */
Log(LogDebug, "InfluxdbWriter")
<< "Flushing pending data buffers.";
<< "Processing pending tasks and flushing data buffers.";
Flush();
/* Work on the missing tasks. TODO: Find a way to cache them on disk. */
Log(LogDebug, "InfluxdbWriter")
<< "Joining existing WQ tasks.";
m_WorkQueue.Enqueue([this]() { FlushWQ(); }, PriorityLow);
/* Wait for the flush to complete, implicitly waits for all WQ tasks enqueued prior to pausing. */
m_WorkQueue.Join();
/* Flush again after the WQ tasks have filled the data buffer. */
Log(LogDebug, "InfluxdbWriter")
<< "Flushing data buffers from WQ tasks.";
Flush();
Log(LogInformation, "InfluxdbWriter")
<< "'" << GetName() << "' paused.";
@ -435,6 +426,7 @@ void InfluxdbWriter::SendMetric(const Checkable::Ptr& checkable, const Dictionar
// Buffer the data point
m_DataBuffer.emplace_back(msgbuf.str());
m_DataBufferSize = m_DataBuffer.size();
// Flush if we've buffered too much to prevent excessive memory use
if (static_cast<int>(m_DataBuffer.size()) >= GetFlushThreshold()) {
@ -442,7 +434,7 @@ void InfluxdbWriter::SendMetric(const Checkable::Ptr& checkable, const Dictionar
<< "Data buffer overflow writing " << m_DataBuffer.size() << " data points";
try {
Flush();
FlushWQ();
} catch (...) {
/* Do nothing. */
}
@ -461,11 +453,13 @@ void InfluxdbWriter::FlushTimeoutWQ()
Log(LogDebug, "InfluxdbWriter")
<< "Timer expired writing " << m_DataBuffer.size() << " data points";
Flush();
FlushWQ();
}
void InfluxdbWriter::Flush()
void InfluxdbWriter::FlushWQ()
{
AssertOnWorkQueue();
namespace beast = boost::beast;
namespace http = beast::http;
@ -478,6 +472,7 @@ void InfluxdbWriter::Flush()
String body = boost::algorithm::join(m_DataBuffer, "\n");
m_DataBuffer.clear();
m_DataBufferSize = 0;
OptionalTlsStream stream;

6
lib/perfdata/influxdbwriter.hpp
View File

@ -10,6 +10,7 @@
#include "base/timer.hpp"
#include "base/tlsstream.hpp"
#include "base/workqueue.hpp"
#include <atomic>
#include <fstream>
namespace icinga
@ -37,9 +38,10 @@ protected:
void Pause() override;
private:
WorkQueue m_WorkQueue{10000000, 1};
Timer::Ptr m_FlushTimer;
WorkQueue m_WorkQueue{10000000, 1};
std::vector<String> m_DataBuffer;
std::atomic_size_t m_DataBufferSize{0};
void CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr);
void CheckResultHandlerWQ(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr);
@ -47,7 +49,7 @@ private:
const String& label, const Dictionary::Ptr& fields, double ts);
void FlushTimeout();
void FlushTimeoutWQ();
void Flush();
void FlushWQ();
static String EscapeKeyOrTagValue(const String& str);
static String EscapeValue(const Value& value);