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414f470c79
* Refactoring: part 1 * Refactoring: part 2 * Handle request using ReadBuffer interface * Struggles with ReadBuffer's * Fix URI parsing * Implement parsing of multipart/form-data * Check HTTP_LENGTH_REQUIRED before eof() or will hang * Fix HTTPChunkedReadBuffer * Fix build and style * Fix test * Resist double-eof * Fix arcadian build
86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
#include <IO/LimitReadBuffer.h>
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#include <Common/Exception.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LIMIT_EXCEEDED;
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}
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bool LimitReadBuffer::nextImpl()
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{
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assert(position() >= in->position());
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/// Let underlying buffer calculate read bytes in `next()` call.
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in->position() = position();
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if (bytes >= limit)
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{
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if (throw_exception)
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throw Exception("Limit for LimitReadBuffer exceeded: " + exception_message, ErrorCodes::LIMIT_EXCEEDED);
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else
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return false;
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}
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if (!in->next())
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{
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working_buffer = in->buffer();
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return false;
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}
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working_buffer = in->buffer();
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if (limit - bytes < working_buffer.size())
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working_buffer.resize(limit - bytes);
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return true;
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}
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LimitReadBuffer::LimitReadBuffer(ReadBuffer * in_, bool owns, UInt64 limit_, bool throw_exception_, std::string exception_message_)
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: ReadBuffer(in_ ? in_->position() : nullptr, 0)
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, in(in_)
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, owns_in(owns)
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, limit(limit_)
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, throw_exception(throw_exception_)
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, exception_message(std::move(exception_message_))
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{
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assert(in);
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size_t remaining_bytes_in_buffer = in->buffer().end() - in->position();
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if (remaining_bytes_in_buffer > limit)
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remaining_bytes_in_buffer = limit;
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working_buffer = Buffer(in->position(), in->position() + remaining_bytes_in_buffer);
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}
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LimitReadBuffer::LimitReadBuffer(ReadBuffer & in_, UInt64 limit_, bool throw_exception_, std::string exception_message_)
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: LimitReadBuffer(&in_, false, limit_, throw_exception_, exception_message_)
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{
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}
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LimitReadBuffer::LimitReadBuffer(std::unique_ptr<ReadBuffer> in_, UInt64 limit_, bool throw_exception_, std::string exception_message_)
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: LimitReadBuffer(in_.release(), true, limit_, throw_exception_, exception_message_)
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{
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}
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LimitReadBuffer::~LimitReadBuffer()
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{
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/// Update underlying buffer's position in case when limit wasn't reached.
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if (!working_buffer.empty())
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in->position() = position();
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if (owns_in)
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delete in;
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}
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}
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