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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "attributefilewriter.h"
#include "attribute_header.h"
#include "attributefilebufferwriter.h"
#include <vespa/fastos/file.h>
#include <vespa/searchlib/common/fileheadercontext.h>
#include <vespa/searchlib/common/tunefileinfo.h>
#include <vespa/searchlib/util/file_settings.h>
#include <vespa/vespalib/data/databuffer.h>
#include <vespa/vespalib/data/fileheader.h>
#include <vespa/vespalib/util/size_literals.h>
#include <vespa/log/log.h>
LOG_SETUP(".searchlib.attribute.attributefilewriter");
using search::common::FileHeaderContext;
using vespalib::getLastErrorString;
namespace search {
namespace {
void
writeDirectIOAligned(FastOS_FileInterface &file, const void *buf, size_t length)
{
const char * data(static_cast<const char *>(buf));
size_t remaining(length);
for (size_t maxChunk(2_Mi); maxChunk >= FileSettings::DIRECTIO_ALIGNMENT; maxChunk >>= 1) {
for ( ; remaining > maxChunk; remaining -= maxChunk, data += maxChunk) {
file.WriteBuf(data, maxChunk);
}
}
if (remaining > 0) {
file.WriteBuf(data, remaining);
}
}
void
updateHeader(const vespalib::string &name, uint64_t fileBitSize)
{
vespalib::FileHeader h(FileSettings::DIRECTIO_ALIGNMENT);
FastOS_File f;
f.OpenReadWrite(name.c_str());
h.readFile(f);
FileHeaderContext::setFreezeTime(h);
using Tag = vespalib::GenericHeader::Tag;
h.putTag(Tag("frozen", 1));
h.putTag(Tag("fileBitSize", fileBitSize));
h.rewriteFile(f);
bool sync_ok = f.Sync();
assert(sync_ok);
}
/*
* BufferWriter implementation that passes full buffers on to
* AttributeFileWriter.
*/
class FileBackedBufferWriter : public AttributeFileBufferWriter
{
public:
FileBackedBufferWriter(AttributeFileWriter &fileWriter);
~FileBackedBufferWriter() override;
void onFlush(size_t nowLen) override;
};
FileBackedBufferWriter::FileBackedBufferWriter(AttributeFileWriter &fileWriter)
: AttributeFileBufferWriter(fileWriter)
{ }
FileBackedBufferWriter::~FileBackedBufferWriter() = default;
void
FileBackedBufferWriter::onFlush(size_t nowLen) {
// Note: Must use const ptr to indicate that buffer is pre-filled.
auto buf(std::make_unique<BufferBuf>(static_cast<const void *>(_buf->getFree()), nowLen));
assert(buf->getDataLen() == nowLen);
assert(buf->getData() == _buf->getFree());
_fileWriter.writeBuf(std::move(buf));
}
}
AttributeFileWriter::
AttributeFileWriter(const TuneFileAttributes &tuneFileAttributes,
const FileHeaderContext &fileHeaderContext,
const attribute::AttributeHeader &header,
const vespalib::string &desc)
: _file(new FastOS_File()),
_tuneFileAttributes(tuneFileAttributes),
_fileHeaderContext(fileHeaderContext),
_header(header),
_desc(desc),
_fileBitSize(0)
{ }
AttributeFileWriter::~AttributeFileWriter() = default;
bool
AttributeFileWriter::open(const vespalib::string &fileName)
{
if (_tuneFileAttributes._write.getWantSyncWrites()) {
_file->EnableSyncWrites();
}
if (_tuneFileAttributes._write.getWantDirectIO()) {
_file->EnableDirectIO();
}
_file->OpenWriteOnlyTruncate(fileName.c_str());
if (!_file->IsOpened()) {
LOG(error, "Could not open attribute vector '%s' for writing: %s",
fileName.c_str(), getLastErrorString().c_str());
return false;
}
writeHeader();
return true;
}
void
AttributeFileWriter::writeHeader()
{
vespalib::FileHeader header(FileSettings::DIRECTIO_ALIGNMENT);
_fileHeaderContext.addTags(header, _file->GetFileName());
addTags(header);
size_t headerLen = header.writeFile(*_file);
assert((headerLen % FileSettings::DIRECTIO_ALIGNMENT) == 0);
_fileBitSize = headerLen * 8;
}
void
AttributeFileWriter::addTags(vespalib::GenericHeader &header)
{
_header.addTags(header);
using Tag = vespalib::GenericHeader::Tag;
header.putTag(Tag("desc", _desc));
}
AttributeFileWriter::Buffer
AttributeFileWriter::allocBuf(size_t size)
{
return std::make_unique<BufferBuf>(size, FileSettings::DIRECTIO_ALIGNMENT);
}
void
AttributeFileWriter::writeBuf(Buffer buf)
{
size_t bufLen = buf->getDataLen();
// TODO: pad to DirectIO boundary when burning bridges
writeDirectIOAligned(*_file, buf->getData(), bufLen);
_fileBitSize += bufLen * 8;
}
void
AttributeFileWriter::close()
{
if (_file->IsOpened()) {
bool synk_ok = _file->Sync();
assert(synk_ok);
bool close_ok = _file->Close();
assert(close_ok);
updateHeader(_file->GetFileName(), _fileBitSize);
}
}
std::unique_ptr<BufferWriter>
AttributeFileWriter::allocBufferWriter()
{
return std::make_unique<FileBackedBufferWriter>(*this);
}
} // namespace search
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