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91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
#include <Common/config.h>
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#if USE_AWS_S3
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# include <IO/ReadBufferFromIStream.h>
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# include <IO/ReadBufferFromS3.h>
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# include <aws/s3/S3Client.h>
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# include <aws/s3/model/GetObjectRequest.h>
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# include <common/logger_useful.h>
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# include <utility>
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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 S3_ERROR;
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extern const int CANNOT_SEEK_THROUGH_FILE;
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extern const int SEEK_POSITION_OUT_OF_BOUND;
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}
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ReadBufferFromS3::ReadBufferFromS3(
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std::shared_ptr<Aws::S3::S3Client> client_ptr_, const String & bucket_, const String & key_, size_t buffer_size_)
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: SeekableReadBuffer(nullptr, 0), client_ptr(std::move(client_ptr_)), bucket(bucket_), key(key_), buffer_size(buffer_size_)
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{
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}
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bool ReadBufferFromS3::nextImpl()
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{
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if (!initialized)
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{
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impl = initialize();
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initialized = true;
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}
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if (!impl->next())
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return false;
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internal_buffer = impl->buffer();
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working_buffer = internal_buffer;
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return true;
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}
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off_t ReadBufferFromS3::seek(off_t offset_, int whence)
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{
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if (initialized)
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throw Exception("Seek is allowed only before first read attempt from the buffer.", ErrorCodes::CANNOT_SEEK_THROUGH_FILE);
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if (whence != SEEK_SET)
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throw Exception("Only SEEK_SET mode is allowed.", ErrorCodes::CANNOT_SEEK_THROUGH_FILE);
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if (offset_ < 0)
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throw Exception("Seek position is out of bounds. Offset: " + std::to_string(offset_), ErrorCodes::SEEK_POSITION_OUT_OF_BOUND);
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offset = offset_;
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return offset;
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}
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off_t ReadBufferFromS3::getPosition()
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{
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return offset + count();
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}
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std::unique_ptr<ReadBuffer> ReadBufferFromS3::initialize()
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{
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LOG_TRACE(log, "Read S3 object. Bucket: " + bucket + ", Key: " + key + ", Offset: " + std::to_string(offset));
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Aws::S3::Model::GetObjectRequest req;
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req.SetBucket(bucket);
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req.SetKey(key);
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if (offset != 0)
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req.SetRange("bytes=" + std::to_string(offset) + "-");
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Aws::S3::Model::GetObjectOutcome outcome = client_ptr->GetObject(req);
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if (outcome.IsSuccess())
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{
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read_result = outcome.GetResultWithOwnership();
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return std::make_unique<ReadBufferFromIStream>(read_result.GetBody(), buffer_size);
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}
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else
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throw Exception(outcome.GetError().GetMessage(), ErrorCodes::S3_ERROR);
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}
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}
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#endif
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