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101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
#include "TraceCollector.h"
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#include <Core/Field.h>
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#include <Poco/Logger.h>
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#include <common/Pipe.h>
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#include <common/StackTrace.h>
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#include <common/logger_useful.h>
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#include <IO/ReadHelpers.h>
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/WriteHelpers.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <Common/Exception.h>
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#include <Interpreters/TraceLog.h>
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namespace DB
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{
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LazyPipe trace_pipe;
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namespace ErrorCodes
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{
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extern const int NULL_POINTER_DEREFERENCE;
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extern const int THREAD_IS_NOT_JOINABLE;
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}
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TraceCollector::TraceCollector(std::shared_ptr<TraceLog> & trace_log)
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: log(&Poco::Logger::get("TraceCollector"))
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, trace_log(trace_log)
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{
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if (trace_log == nullptr)
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throw Exception("Invalid trace log pointer passed", ErrorCodes::NULL_POINTER_DEREFERENCE);
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trace_pipe.open();
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thread = ThreadFromGlobalPool(&TraceCollector::run, this);
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}
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TraceCollector::~TraceCollector()
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{
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if (!thread.joinable())
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LOG_ERROR(log, "TraceCollector thread is malformed and cannot be joined");
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else
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{
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TraceCollector::notifyToStop();
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thread.join();
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}
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trace_pipe.close();
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}
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/**
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* Sends TraceCollector stop message
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*
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* Each sequence of data for TraceCollector thread starts with a boolean flag.
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* If this flag is true, TraceCollector must stop reading trace_pipe and exit.
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* This function sends flag with a true value to stop TraceCollector gracefully.
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*
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* NOTE: TraceCollector will NOT stop immediately as there may be some data left in the pipe
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* before stop message.
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*/
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void TraceCollector::notifyToStop()
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{
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WriteBufferFromFileDescriptor out(trace_pipe.fds_rw[1]);
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writeChar(true, out);
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out.next();
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}
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void TraceCollector::run()
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{
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ReadBufferFromFileDescriptor in(trace_pipe.fds_rw[0]);
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while (true)
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{
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char is_last;
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readChar(is_last, in);
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if (is_last)
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break;
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std::string query_id;
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StackTrace stack_trace(NoCapture{});
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TimerType timer_type;
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readStringBinary(query_id, in);
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readPODBinary(stack_trace, in);
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readPODBinary(timer_type, in);
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const auto size = stack_trace.getSize();
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const auto & frames = stack_trace.getFrames();
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Array trace;
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trace.reserve(size);
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for (size_t i = 0; i < size; i++)
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trace.emplace_back(UInt64(reinterpret_cast<uintptr_t>(frames[i])));
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TraceLogElement element{std::time(nullptr), timer_type, query_id, trace};
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trace_log->add(element);
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}
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}
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}
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