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#include <QueryPipeline/BlockIO.h>
#include <Interpreters/ProcessList.h>
namespace DB
{
namespace ErrorCodes
{
extern const int QUERY_WAS_CANCELLED;
}
void BlockIO::reset()
{
/** process_list_entry should be destroyed after in, after out and after pipeline,
* since in, out and pipeline contain pointer to objects inside process_list_entry (query-level MemoryTracker for example),
* which could be used before destroying of in and out.
*
* However, QueryStatus inside process_list_entry holds shared pointers to streams for some reason.
* Streams must be destroyed before storage locks, storages and contexts inside pipeline,
* so releaseQueryStreams() is required.
*/
/// TODO simplify it all
pipeline.reset();
process_list_entry.reset();
/// TODO Do we need also reset callbacks? In which order?
}
BlockIO & BlockIO::operator= (BlockIO && rhs) noexcept
{
if (this == &rhs)
return *this;
/// Explicitly reset fields, so everything is destructed in right order
reset();
process_list_entry = std::move(rhs.process_list_entry);
pipeline = std::move(rhs.pipeline);
finish_callback = std::move(rhs.finish_callback);
exception_callback = std::move(rhs.exception_callback);
null_format = rhs.null_format;
return *this;
}
BlockIO::~BlockIO()
{
reset();
}
void BlockIO::onFinish()
{
if (finish_callback)
finish_callback(pipeline);
pipeline.reset();
}
void BlockIO::onException()
{
if (exception_callback)
exception_callback(/* log_error */ true);
pipeline.reset();
}
void BlockIO::onCancelOrConnectionLoss()
{
/// Query was not finished gracefully, so we should call exception_callback
/// But we don't have a real exception
try
{
throw Exception(ErrorCodes::QUERY_WAS_CANCELLED, "Query was cancelled or a client has unexpectedly dropped the connection");
}
catch (...)
{
if (exception_callback)
{
exception_callback(/* log_error */ false);
}
/// destroy pipeline and write buffers with an exception context
pipeline.reset();
}
}
void BlockIO::setAllDataSent() const
{
/// The following queries does not have process_list_entry:
/// - internal
/// - SHOW PROCESSLIST
if (process_list_entry)
process_list_entry->getQueryStatus()->setAllDataSent();
}
}
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