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#include <Processors/ISource.h>
#include <QueryPipeline/StreamLocalLimits.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
}
ISource::~ISource() = default;
ISource::ISource(Block header, bool enable_auto_progress)
: IProcessor({}, {std::move(header)})
, auto_progress(enable_auto_progress)
, output(outputs.front())
{
}
ISource::Status ISource::prepare()
{
if (finished)
{
output.finish();
return Status::Finished;
}
/// Check can output.
if (output.isFinished())
return Status::Finished;
if (!output.canPush())
return Status::PortFull;
if (!has_input)
return Status::Ready;
output.pushData(std::move(current_chunk));
has_input = false;
if (isCancelled())
{
output.finish();
return Status::Finished;
}
if (got_exception)
{
finished = true;
output.finish();
return Status::Finished;
}
/// Now, we pushed to output, and it must be full.
return Status::PortFull;
}
void ISource::setStorageLimits(const std::shared_ptr<const StorageLimitsList> & storage_limits_)
{
storage_limits = storage_limits_;
}
void ISource::progress(size_t read_rows, size_t read_bytes)
{
//std::cerr << "========= Progress " << read_rows << " from " << getName() << std::endl << StackTrace().toString() << std::endl;
read_progress_was_set = true;
read_progress.read_rows += read_rows;
read_progress.read_bytes += read_bytes;
}
std::optional<ISource::ReadProgress> ISource::getReadProgress()
{
if (finished && read_progress.read_bytes == 0 && read_progress.total_rows_approx == 0)
return {};
ReadProgressCounters res_progress;
std::swap(read_progress, res_progress);
if (storage_limits)
return ReadProgress{res_progress, *storage_limits};
static StorageLimitsList empty_limits;
return ReadProgress{res_progress, empty_limits};
}
void ISource::work()
{
try
{
read_progress_was_set = false;
if (auto chunk = tryGenerate())
{
current_chunk.chunk = std::move(*chunk);
if (current_chunk.chunk)
{
has_input = true;
if (auto_progress && !read_progress_was_set)
progress(current_chunk.chunk.getNumRows(), current_chunk.chunk.bytes());
}
}
else
finished = true;
if (isCancelled())
finished = true;
}
catch (...)
{
finished = true;
got_exception = true;
throw;
}
}
Chunk ISource::generate()
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "generate is not implemented for {}", getName());
}
std::optional<Chunk> ISource::tryGenerate()
{
auto chunk = generate();
if (!chunk)
return std::nullopt;
return chunk;
}
}
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