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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "common.h"
#include "eventpipeprotocolhelper.h"
#include "diagnosticsipc.h"
#include "diagnosticsprotocol.h"
#ifdef FEATURE_PERFTRACING
bool EventPipeProtocolHelper::TryParseProviderConfigurations(uint8_t *&bufferCursor, uint32_t &bufferLen, CQuickArray<EventPipeProviderConfiguration> &result)
{
// Picking an arbitrary upper bound,
// This should be larger than any reasonable client request.
const uint32_t MaxCountConfigs = 1000; // TODO: This might be too large.
uint32_t countConfigs = 0;
if (!TryParse(bufferCursor, bufferLen, countConfigs))
return false;
if (countConfigs > MaxCountConfigs)
return false;
EventPipeProviderConfiguration *pConfigs = result.AllocNoThrow(countConfigs);
if (pConfigs == nullptr)
return false;
for (uint32_t i = 0; i < countConfigs; i++)
{
uint64_t keywords = 0;
if (!TryParse(bufferCursor, bufferLen, keywords))
return false;
uint32_t logLevel = 0;
if (!TryParse(bufferCursor, bufferLen, logLevel))
return false;
if (logLevel > 5) // (logLevel > EventPipeEventLevel::Verbose)
return false;
LPCWSTR pProviderName = nullptr;
if (!TryParseString(bufferCursor, bufferLen, pProviderName))
return false;
if (wcslen(pProviderName) == 0)
return false; // TODO: Should we ignore these input?
LPCWSTR pFilterData = nullptr; // This parameter is optional.
TryParseString(bufferCursor, bufferLen, pFilterData);
pConfigs[i] = EventPipeProviderConfiguration(pProviderName, keywords, logLevel, pFilterData);
}
return true;
}
void EventPipeProtocolHelper::EnableFileTracingEventHandler(IpcStream *pStream)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(pStream != nullptr);
}
CONTRACTL_END;
// TODO: Read within a loop.
const uint32_t BufferSize = 8192;
uint8_t buffer[BufferSize]{};
uint32_t nNumberOfBytesRead = 0;
bool fSuccess = pStream->Read(buffer, sizeof(buffer), nNumberOfBytesRead);
if (!fSuccess)
{
// TODO: Add error handling.
delete pStream;
return;
}
// The protocol buffer is defined as:
// X, Y, Z means encode bytes for X followed by bytes for Y followed by bytes for Z
// message = uint circularBufferMB, ulong multiFileTraceLength, string outputPath, array<provider_config> providers
// uint = 4 little endian bytes
// ulong = 8 little endian bytes
// wchar = 2 little endian bytes, UTF16 encoding
// array<T> = uint length, length # of Ts
// string = (array<char> where the last char must = 0) or (length = 0)
// provider_config = ulong keywords, uint logLevel, string provider_name, string filter_data
LPCWSTR strOutputPath;
uint32_t circularBufferSizeInMB = EventPipeProtocolHelper::DefaultCircularBufferMB;
uint64_t multiFileTraceLengthInSeconds = EventPipeProtocolHelper::DefaultMultiFileTraceLengthInSeconds;
CQuickArray<EventPipeProviderConfiguration> providerConfigs;
uint8_t *pBufferCursor = buffer;
uint32_t bufferLen = nNumberOfBytesRead;
if (!TryParse(pBufferCursor, bufferLen, circularBufferSizeInMB) ||
!TryParse(pBufferCursor, bufferLen, multiFileTraceLengthInSeconds) ||
!TryParseString(pBufferCursor, bufferLen, strOutputPath) ||
!TryParseProviderConfigurations(pBufferCursor, bufferLen, providerConfigs))
{
return; // TODO: error handling
}
EventPipeSessionID sessionId = (EventPipeSessionID) nullptr;
if (providerConfigs.Size() > 0)
{
sessionId = EventPipe::Enable(
strOutputPath, // outputFile
circularBufferSizeInMB, // circularBufferSizeInMB
DefaultProfilerSamplingRateInNanoseconds, // ProfilerSamplingRateInNanoseconds
providerConfigs.Ptr(), // pConfigs
static_cast<uint32_t>(providerConfigs.Size()), // numConfigs
multiFileTraceLengthInSeconds); // multiFileTraceLengthInSeconds
}
uint32_t nBytesWritten = 0;
fSuccess = pStream->Write(&sessionId, sizeof(sessionId), nBytesWritten);
if (!fSuccess)
{
// TODO: Add error handling.
delete pStream;
return;
}
fSuccess = pStream->Flush();
if (!fSuccess)
{
// TODO: Add error handling.
}
delete pStream;
}
void EventPipeProtocolHelper::DisableTracingEventHandler(IpcStream *pStream)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
PRECONDITION(pStream != nullptr);
}
CONTRACTL_END;
uint32_t nNumberOfBytesRead = 0;
EventPipeSessionID sessionId = (EventPipeSessionID) nullptr;
const bool fSuccess = pStream->Read(&sessionId, sizeof(sessionId), nNumberOfBytesRead);
if (!fSuccess || nNumberOfBytesRead != sizeof(sessionId))
{
// TODO: Add error handling.
delete pStream;
return;
}
EventPipe::Disable(sessionId);
// TODO: Should we acknowledge back?
delete pStream;
}
#endif // FEATURE_PERFTRACING
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