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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "chunks.h"
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/util/crc.h>
#include <vespa/vespalib/util/exceptions.h>
#include <xxhash.h>
#include <cassert>
#include <ostream>
#include <vespa/log/log.h>
LOG_SETUP(".searchlib.transactionlog.ichunk");
using std::make_unique;
using vespalib::make_string_short::fmt;
using vespalib::nbostream_longlivedbuf;
using vespalib::compression::CompressionConfig;
using vespalib::IllegalArgumentException;
namespace search::transactionlog {
Encoding::Encoding(Crc crc, Compression compression)
: _raw(crc | (compression << 4u))
{
assert(crc <= Crc::xxh64);
assert(compression <= Compression::zstd);
}
IChunk::~IChunk() = default;
void
IChunk::add(const Packet::Entry & entry) {
_entries.emplace_back(entry);
}
SerialNumRange
IChunk::range() const {
return _entries.empty()
? SerialNumRange()
: SerialNumRange(_entries.front().serial(), _entries.back().serial());
}
void
IChunk::deserializeEntries(nbostream & is) {
while (is.good() && !is.empty()) {
Packet::Entry e;
e.deserialize(is);
add(e);
}
}
void
IChunk::serializeEntries(nbostream & os) const {
for (const auto & e : _entries) {
e.serialize(os);
}
}
Encoding
IChunk::encode(nbostream & os) const {
return onEncode(os);
}
void
IChunk::decode(nbostream & is) {
onDecode(is);
}
IChunk::UP
IChunk::create(uint8_t chunkType) {
return create(Encoding(chunkType), 9);
}
IChunk::UP
IChunk::create(Encoding encoding, uint8_t compressionLevel) {
switch (encoding.getCrc()) {
case Encoding::Crc::xxh64:
switch (encoding.getCompression()) {
case Encoding::Compression::none:
return make_unique<XXH64NoneChunk>();
case Encoding::Compression::none_multi:
return make_unique<XXH64CompressedChunk>(CompressionConfig::NONE_MULTI, compressionLevel);
case Encoding::Compression::lz4:
return make_unique<XXH64CompressedChunk>(CompressionConfig::LZ4, compressionLevel);
case Encoding::Compression::zstd:
return make_unique<XXH64CompressedChunk>(CompressionConfig::ZSTD, compressionLevel);
default:
throw IllegalArgumentException(fmt("Unhandled compression type '%d' for xxh64, compression=",
encoding.getCompression()));
}
case Encoding::Crc::ccitt_crc32:
switch (encoding.getCompression()) {
case Encoding::Compression::none:
return make_unique<CCITTCRC32NoneChunk>();
default:
throw IllegalArgumentException(fmt("Unhandled compression type '%d' for ccitt_crc32, compression=",
encoding.getCompression()));
}
default:
throw IllegalArgumentException(fmt("Unhandled crc type '%d'", encoding.getCrc()));
}
}
int32_t
Encoding::calcCrc(Crc version, const void * buf, size_t sz)
{
if (version == xxh64) {
return static_cast<int32_t>(XXH64(buf, sz, 0ll));
} else if (version == ccitt_crc32) {
vespalib::crc_32_type calculator;
calculator.process_bytes(buf, sz);
return calculator.checksum();
} else {
abort();
}
}
std::ostream &
operator << (std::ostream & os, Encoding e) {
return os << "crc=" << e.getCrc() << " compression=" << e.getCompression();
}
void
encode(vespalib::nbostream & os, const IChunk & chunk, Encoding encoding) {
size_t begin = os.wp();
os << encoding.getRaw(); // Placeholder for encoding
os << uint32_t(0); // Placeholder for size
Encoding realEncoding = chunk.encode(os);
size_t end = os.wp();
os.wp(0);
os << realEncoding.getRaw(); //Patching real encoding
os << uint32_t(end - (begin + sizeof(uint32_t) + sizeof(uint8_t))); // Patching actual size.
os.wp(end);
SerialNumRange range = chunk.range();
LOG(spam, "Encoded chunk with %zu entries and %zu bytes, range[%" PRIu64 ", %" PRIu64 "] encoding(wanted=%x, real=%x)",
chunk.getEntries().size(), os.size(), range.from(), range.to(), encoding.getRaw(), realEncoding.getRaw());
}
SerializedChunk::SerializedChunk(std::unique_ptr<CommitChunk> commitChunk, Encoding encoding, uint8_t compressionLevel)
: _commitChunk(std::move(commitChunk)),
_os(),
_range(_commitChunk->getPacket().range()),
_numEntries(_commitChunk->getPacket().size())
{
Packet packet = _commitChunk->stealPacket();
nbostream_longlivedbuf h(packet.getHandle().data(), packet.getHandle().size());
IChunk::UP chunk = IChunk::create(encoding, compressionLevel);
SerialNum prev = 0;
while (h.size() > 0) {
//LOG(spam,
//"Pos(%d) Len(%d), Lim(%d), Remaining(%d)",
//h.getPos(), h.getLength(), h.getLimit(), h.getRemaining());
Packet::Entry entry;
entry.deserialize(h);
assert (prev < entry.serial());
chunk->add(entry);
prev = entry.serial();
}
assert(! chunk->getEntries().empty());
encode(_os, *chunk, encoding);
}
SerializedChunk::~SerializedChunk() = default;
vespalib::ConstBufferRef SerializedChunk::getData() const {
return vespalib::ConstBufferRef(_os.data(), _os.size());
}
}
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