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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "indexreadutilities.h"
#include "indexdisklayout.h"
#include <vespa/fastlib/io/bufferedfile.h>
#include <vespa/vespalib/data/fileheader.h>
#include <filesystem>
#include <set>
#include <vector>
#include <vespa/log/log.h>
LOG_SETUP(".searchcorespi.index.indexreadutilities");
using search::SerialNum;
using vespalib::FileHeader;
namespace searchcorespi::index {
namespace {
/**
* Assumes that cleanup has removed all obsolete index dirs.
**/
void
scanForIndexes(const vespalib::string &baseDir,
std::vector<vespalib::string> &flushDirs,
vespalib::string &fusionDir)
{
std::filesystem::directory_iterator dir_scan{std::filesystem::path(baseDir)};
for (auto& entry : dir_scan) {
if (entry.is_directory()) {
vespalib::string name = entry.path().filename().string();
if (name.find(IndexDiskLayout::FlushDirPrefix) == 0) {
flushDirs.push_back(name);
}
if (name.find(IndexDiskLayout::FusionDirPrefix) == 0) {
if (!fusionDir.empty()) {
// Should never happen, since we run cleanup before load.
LOG(warning, "Base directory '%s' contains multiple fusion indexes",
baseDir.c_str());
}
fusionDir = name;
}
}
}
}
}
FusionSpec
IndexReadUtilities::readFusionSpec(const vespalib::string &baseDir)
{
std::vector<vespalib::string> flushDirs;
vespalib::string fusionDir;
scanForIndexes(baseDir, flushDirs, fusionDir);
uint32_t fusionId = 0;
if (!fusionDir.empty()) {
fusionId = atoi(fusionDir.substr(IndexDiskLayout::FusionDirPrefix.size()).c_str());
}
std::set<uint32_t> flushIds;
for (size_t i = 0; i < flushDirs.size(); ++i) {
uint32_t id = atoi(flushDirs[i].substr(IndexDiskLayout::FlushDirPrefix.size()).c_str());
flushIds.insert(id);
}
FusionSpec fusionSpec;
fusionSpec.last_fusion_id = fusionId;
fusionSpec.flush_ids.assign(flushIds.begin(), flushIds.end());
return fusionSpec;
}
SerialNum
IndexReadUtilities::readSerialNum(const vespalib::string &dir)
{
const vespalib::string fileName = IndexDiskLayout::getSerialNumFileName(dir);
Fast_BufferedFile file;
file.ReadOpen(fileName.c_str());
FileHeader fileHeader;
fileHeader.readFile(file);
if (fileHeader.hasTag(IndexDiskLayout::SerialNumTag)) {
return fileHeader.getTag(IndexDiskLayout::SerialNumTag).asInteger();
}
return 0;
}
}
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