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#include <Processors/Transforms/ExceptionKeepingTransform.h>
#include <Common/ThreadStatus.h>
#include <Common/Stopwatch.h>
#include <base/scope_guard.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
ExceptionKeepingTransform::ExceptionKeepingTransform(const Block & in_header, const Block & out_header, bool ignore_on_start_and_finish_)
: IProcessor({in_header}, {out_header})
, input(inputs.front()), output(outputs.front())
, ignore_on_start_and_finish(ignore_on_start_and_finish_)
{
}
IProcessor::Status ExceptionKeepingTransform::prepare()
{
if (stage == Stage::Start)
{
if (ignore_on_start_and_finish)
stage = Stage::Consume;
else
return Status::Ready;
}
/// Check can output.
if (output.isFinished())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Output port is finished for {}", getName());
if (!output.canPush())
{
input.setNotNeeded();
return Status::PortFull;
}
/// Output if has data.
if (ready_output)
{
output.pushData(std::move(data));
ready_output = false;
return Status::PortFull;
}
if (stage == Stage::Generate)
return Status::Ready;
while (!ready_input)
{
if (input.isFinished())
{
if (stage != Stage::Exception && stage != Stage::Finish)
{
stage = Stage::Finish;
if (!ignore_on_start_and_finish)
return Status::Ready;
}
output.finish();
return Status::Finished;
}
input.setNeeded();
if (!input.hasData())
return Status::NeedData;
data = input.pullData(true);
if (data.exception)
{
stage = Stage::Exception;
onException(data.exception);
output.pushData(std::move(data));
return Status::PortFull;
}
if (stage == Stage::Exception)
/// In case of exception, just drop all other data.
/// If transform is stateful, it's state may be broken after exception from transform()
data.chunk.clear();
else
ready_input = true;
}
return Status::Ready;
}
static std::exception_ptr runStep(std::function<void()> step, ThreadStatus * thread_status, std::atomic_uint64_t * elapsed_ms)
{
std::exception_ptr res;
std::optional<Stopwatch> watch;
auto * original_thread = current_thread;
SCOPE_EXIT({ current_thread = original_thread; });
if (thread_status)
{
/// Change thread context to store individual metrics. Once the work in done, go back to the original thread
thread_status->resetPerformanceCountersLastUsage();
current_thread = thread_status;
}
if (elapsed_ms)
watch.emplace();
try
{
step();
}
catch (...)
{
res = std::current_exception();
}
if (thread_status)
thread_status->updatePerformanceCounters();
if (elapsed_ms && watch)
*elapsed_ms += watch->elapsedMilliseconds();
return res;
}
void ExceptionKeepingTransform::work()
{
if (stage == Stage::Start)
{
stage = Stage::Consume;
if (auto exception = runStep([this] { onStart(); }, thread_status, elapsed_counter_ms))
{
stage = Stage::Exception;
ready_output = true;
data.exception = exception;
onException(data.exception);
}
}
else if (stage == Stage::Consume || stage == Stage::Generate)
{
if (stage == Stage::Consume)
{
ready_input = false;
if (auto exception = runStep([this] { onConsume(std::move(data.chunk)); }, thread_status, elapsed_counter_ms))
{
stage = Stage::Exception;
ready_output = true;
data.exception = exception;
onException(data.exception);
}
else
stage = Stage::Generate;
}
if (stage == Stage::Generate)
{
GenerateResult res;
if (auto exception = runStep([this, &res] { res = onGenerate(); }, thread_status, elapsed_counter_ms))
{
stage = Stage::Exception;
ready_output = true;
data.exception = exception;
onException(data.exception);
}
else
{
if (res.chunk)
{
data.chunk = std::move(res.chunk);
ready_output = true;
}
if (res.is_done)
stage = Stage::Consume;
}
}
}
else if (stage == Stage::Finish)
{
if (auto exception = runStep([this] { onFinish(); }, thread_status, elapsed_counter_ms))
{
stage = Stage::Exception;
ready_output = true;
data.exception = exception;
onException(data.exception);
}
}
}
void ExceptionKeepingTransform::setRuntimeData(ThreadStatus * thread_status_, std::atomic_uint64_t * elapsed_counter_ms_)
{
thread_status = thread_status_;
elapsed_counter_ms = elapsed_counter_ms_;
}
}
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