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#include "SqliteBackend.h"
#include <picosha2.h>
#include <numeric>
#include <stdexcept>
namespace nt
{
static std::string JoinPath(const std::vector<std::string>& path)
{
return std::accumulate(
std::next(path.begin()), path.end(), path.front(),
[](std::string a, const std::string& b) { return std::move(a) + "/" + b; });
}
SqliteBackend::SqliteBackend(const std::string& path)
{
if (sqlite3_open(path.c_str(), &db_) != SQLITE_OK)
throw std::runtime_error(sqlite3_errmsg(db_));
const char* schema =
"CREATE TABLE IF NOT EXISTS kv ("
" hash TEXT PRIMARY KEY,"
" value BLOB NOT NULL"
");"
"CREATE TABLE IF NOT EXISTS relation_index ("
" path TEXT NOT NULL,"
" tuple_hash TEXT NOT NULL,"
" UNIQUE(path, tuple_hash)"
");";
char* err = nullptr;
if (sqlite3_exec(db_, schema, nullptr, nullptr, &err) != SQLITE_OK)
{
std::string msg(err);
sqlite3_free(err);
throw std::runtime_error(msg);
}
}
SqliteBackend::~SqliteBackend()
{
sqlite3_close(db_);
}
std::string SqliteBackend::PathKey(const std::vector<std::string>& path)
{
return JoinPath(path);
}
std::string SqliteBackend::Put(std::vector<uint8_t> value)
{
const std::string hash = picosha2::hash256_hex_string(value.begin(), value.end());
sqlite3_stmt* stmt = nullptr;
sqlite3_prepare_v2(db_,
"INSERT OR IGNORE INTO kv (hash, value) VALUES (?, ?)",
-1, &stmt, nullptr);
sqlite3_bind_text(stmt, 1, hash.c_str(), -1, SQLITE_TRANSIENT);
sqlite3_bind_blob(stmt, 2, value.data(), static_cast<int>(value.size()), SQLITE_TRANSIENT);
sqlite3_step(stmt);
sqlite3_finalize(stmt);
return hash;
}
std::optional<std::vector<uint8_t>> SqliteBackend::Get(const std::string& hash)
{
sqlite3_stmt* stmt = nullptr;
sqlite3_prepare_v2(db_,
"SELECT value FROM kv WHERE hash = ?",
-1, &stmt, nullptr);
sqlite3_bind_text(stmt, 1, hash.c_str(), -1, SQLITE_TRANSIENT);
std::optional<std::vector<uint8_t>> result;
if (sqlite3_step(stmt) == SQLITE_ROW)
{
const auto* blob = static_cast<const uint8_t*>(sqlite3_column_blob(stmt, 0));
int size = sqlite3_column_bytes(stmt, 0);
result = std::vector<uint8_t>(blob, blob + size);
}
sqlite3_finalize(stmt);
return result;
}
void SqliteBackend::LinkTuple(const std::vector<std::string>& relation_path,
const std::string& tuple_hash)
{
const std::string path_key = PathKey(relation_path);
sqlite3_stmt* stmt = nullptr;
sqlite3_prepare_v2(db_,
"INSERT OR IGNORE INTO relation_index (path, tuple_hash) VALUES (?, ?)",
-1, &stmt, nullptr);
sqlite3_bind_text(stmt, 1, path_key.c_str(), -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, tuple_hash.c_str(), -1, SQLITE_TRANSIENT);
sqlite3_step(stmt);
sqlite3_finalize(stmt);
}
std::vector<std::string> SqliteBackend::TupleHashes(
const std::vector<std::string>& relation_path,
std::size_t offset,
std::size_t limit)
{
const std::string path_key = PathKey(relation_path);
sqlite3_stmt* stmt = nullptr;
sqlite3_prepare_v2(db_,
"SELECT tuple_hash FROM relation_index"
" WHERE path = ? ORDER BY rowid LIMIT ? OFFSET ?",
-1, &stmt, nullptr);
sqlite3_bind_text(stmt, 1, path_key.c_str(), -1, SQLITE_TRANSIENT);
sqlite3_bind_int64(stmt, 2, static_cast<sqlite3_int64>(limit));
sqlite3_bind_int64(stmt, 3, static_cast<sqlite3_int64>(offset));
std::vector<std::string> hashes;
while (sqlite3_step(stmt) == SQLITE_ROW)
hashes.emplace_back(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 0)));
sqlite3_finalize(stmt);
return hashes;
}
}
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