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9ef7dac0b5
Cf. #44758 Function try blocks in ctors/dtors implicitly rethrow, making them more or less useless. https://www.onlinegdb.com/pCKQA0wTIN (click RUN) https://stackoverflow.com/questions/5612486/when-is-a-function-try-block-useful/5612508#5612508 Fortunately, this seems the only place like that in the codebase.
129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
#include "TraceCollector.h"
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#include <Core/Field.h>
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/ReadHelpers.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <IO/WriteHelpers.h>
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#include <Interpreters/TraceLog.h>
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#include <Poco/Logger.h>
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#include <Common/ProfileEvents.h>
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#include <Common/setThreadName.h>
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#include <Common/logger_useful.h>
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namespace DB
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{
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TraceCollector::TraceCollector(std::shared_ptr<TraceLog> trace_log_)
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: trace_log(std::move(trace_log_))
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{
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TraceSender::pipe.open();
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/** Turn write end of pipe to non-blocking mode to avoid deadlocks
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* when QueryProfiler is invoked under locks and TraceCollector cannot pull data from pipe.
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*/
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TraceSender::pipe.setNonBlockingWrite();
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TraceSender::pipe.tryIncreaseSize(1 << 20);
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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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try
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{
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if (!thread.joinable())
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LOG_ERROR(&Poco::Logger::get("TraceCollector"), "TraceCollector thread is malformed and cannot be joined");
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else
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stop();
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TraceSender::pipe.close();
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}
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catch (...)
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{
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tryLogCurrentException("TraceCollector");
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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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void TraceCollector::stop()
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{
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WriteBufferFromFileDescriptor out(TraceSender::pipe.fds_rw[1]);
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writeChar(true, out);
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out.next();
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thread.join();
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}
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void TraceCollector::run()
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{
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setThreadName("TraceCollector");
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ReadBufferFromFileDescriptor in(TraceSender::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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UInt8 query_id_size = 0;
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readBinary(query_id_size, in);
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query_id.resize(query_id_size);
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in.readStrict(query_id.data(), query_id_size);
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UInt8 trace_size = 0;
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readIntBinary(trace_size, in);
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Array trace;
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trace.reserve(trace_size);
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for (size_t i = 0; i < trace_size; ++i)
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{
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uintptr_t addr = 0;
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readPODBinary(addr, in);
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trace.emplace_back(static_cast<UInt64>(addr));
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}
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TraceType trace_type;
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readPODBinary(trace_type, in);
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UInt64 thread_id;
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readPODBinary(thread_id, in);
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Int64 size;
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readPODBinary(size, in);
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ProfileEvents::Event event;
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readPODBinary(event, in);
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ProfileEvents::Count increment;
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readPODBinary(increment, in);
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if (trace_log)
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{
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// time and time_in_microseconds are both being constructed from the same timespec so that the
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// times will be equal up to the precision of a second.
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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UInt64 time = static_cast<UInt64>(ts.tv_sec * 1000000000LL + ts.tv_nsec);
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UInt64 time_in_microseconds = static_cast<UInt64>((ts.tv_sec * 1000000LL) + (ts.tv_nsec / 1000));
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TraceLogElement element{time_t(time / 1000000000), time_in_microseconds, time, trace_type, thread_id, query_id, trace, size, event, increment};
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trace_log->add(element);
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}
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}
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}
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}
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