ResourceCache
This commit is contained in:
@@ -1,7 +1,491 @@
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#include "ResourceCache.hpp"
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#include <fstream>
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namespace LV::Client {
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CacheDatabase::CacheDatabase(const fs::path &cachePath)
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: Path(cachePath)
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{
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int errc = sqlite3_open_v2((Path / "db.sqlite3").c_str(), &DB, SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE, nullptr);
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if(errc) {
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MAKE_ERROR("Не удалось открыть базу данных " << (Path / "db.sqlite3").c_str() << ": " << sqlite3_errmsg(DB));
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}
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const char* sql = R"(
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CREATE TABLE IF NOT EXISTS files(
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sha256 BLOB(32) NOT NULL, --
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last_used INT NOT NULL, -- unix timestamp
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size INT NOT NULL, -- file size
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UNIQUE (sha256));
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)";
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errc = sqlite3_exec(DB, sql, nullptr, nullptr, nullptr);
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if(errc != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить таблицу базы: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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INSERT OR REPLACE INTO files (sha256, last_used, size)
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VALUES (?, ?, ?);
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_INSERT, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_INSERT: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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UPDATE files SET last_used = ? WHERE sha256 = ?;
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_UPDATE_TIME, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_UPDATE_TIME: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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DELETE FROM files WHERE sha256=?;
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_REMOVE, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_REMOVE: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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SELECT sha256 FROM files;
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_ALL_HASH, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_ALL_HASH: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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SELECT SUM(size) FROM files;
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_SUM, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_SUM: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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SELECT sha256, size FROM files WHERE last_used < ?;
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_OLD, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_OLD: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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SELECT sha256
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FROM files
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ORDER BY last_used ASC, size ASC
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LIMIT (
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SELECT COUNT(*) FROM (
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SELECT SUM(size) OVER (ORDER BY last_used ASC, size ASC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS running_total
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FROM files
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ORDER BY last_used ASC, size ASC
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) sub
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WHERE running_total <= ?
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);
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_TO_FREE, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_TO_FREE: " << sqlite3_errmsg(DB));
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}
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sql = R"(
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SELECT COUNT(*) FROM files;
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)";
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if(sqlite3_prepare_v2(DB, sql, -1, &STMT_COUNT, nullptr) != SQLITE_OK) {
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MAKE_ERROR("Не удалось подготовить запрос STMT_COUNT: " << sqlite3_errmsg(DB));
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}
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}
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CacheDatabase::~CacheDatabase() {
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for(sqlite3_stmt* stmt : {STMT_INSERT, STMT_UPDATE_TIME, STMT_REMOVE, STMT_ALL_HASH, STMT_SUM, STMT_OLD, STMT_TO_FREE, STMT_COUNT})
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if(stmt)
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sqlite3_finalize(stmt);
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if(DB)
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sqlite3_close(DB);
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}
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size_t CacheDatabase::getCacheSize() {
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size_t Size;
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if(sqlite3_step(STMT_SUM) != SQLITE_ROW) {
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sqlite3_reset(STMT_SUM);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_SUM: " << sqlite3_errmsg(DB));
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}
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Size = sqlite3_column_int64(STMT_SUM, 0);
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sqlite3_reset(STMT_SUM);
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return Size;
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}
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std::pair<std::string, size_t> CacheDatabase::getAllHash() {
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if(sqlite3_step(STMT_COUNT) != SQLITE_ROW) {
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sqlite3_reset(STMT_COUNT);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_COUNT: " << sqlite3_errmsg(DB));
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}
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size_t count = sqlite3_column_int(STMT_COUNT, 0);
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sqlite3_reset(STMT_COUNT);
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std::string out;
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out.reserve(32*count);
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int errc;
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size_t readed = 0;
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while(true) {
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errc = sqlite3_step(STMT_ALL_HASH);
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if(errc == SQLITE_DONE)
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break;
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else if(errc != SQLITE_ROW) {
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sqlite3_reset(STMT_ALL_HASH);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_ALL_HASH: " << sqlite3_errmsg(DB));
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}
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const char *hash = (const char*) sqlite3_column_blob(STMT_ALL_HASH, 0);
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readed++;
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out += std::string_view(hash, hash+32);
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}
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sqlite3_reset(STMT_ALL_HASH);
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return {out, readed};
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}
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void CacheDatabase::updateTimeFor(HASH hash) {
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sqlite3_bind_blob(STMT_UPDATE_TIME, 0, (const void*) hash.data(), 32, SQLITE_STATIC);
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sqlite3_bind_int(STMT_UPDATE_TIME, 1, time(nullptr));
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if(sqlite3_step(STMT_UPDATE_TIME) != SQLITE_OK) {
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sqlite3_reset(STMT_UPDATE_TIME);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_UPDATE_TIME: " << sqlite3_errmsg(DB));
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}
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sqlite3_reset(STMT_UPDATE_TIME);
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}
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void CacheDatabase::insert(HASH hash, size_t size) {
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assert(size < (size_t(1) << 31)-1 && size > 0);
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sqlite3_bind_blob(STMT_INSERT, 0, (const void*) hash.data(), 32, SQLITE_STATIC);
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sqlite3_bind_int(STMT_INSERT, 1, (int) size);
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sqlite3_bind_int(STMT_INSERT, 2, time(nullptr));
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if(sqlite3_step(STMT_INSERT) != SQLITE_OK) {
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sqlite3_reset(STMT_INSERT);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_INSERT: " << sqlite3_errmsg(DB));
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}
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sqlite3_reset(STMT_INSERT);
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}
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std::vector<CacheDatabase::HASH> CacheDatabase::findExcessHashes(size_t bytesToFree, int timeBefore = time(nullptr)-604800) {
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std::vector<HASH> out;
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size_t removed = 0;
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sqlite3_bind_int(STMT_OLD, 0, timeBefore);
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while(true) {
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int errc = sqlite3_step(STMT_OLD);
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if(errc == SQLITE_DONE)
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break;
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else if(errc != SQLITE_ROW) {
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sqlite3_reset(STMT_OLD);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_OLD: " << sqlite3_errmsg(DB));
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}
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const uint8_t *hash = (const uint8_t*) sqlite3_column_blob(STMT_OLD, 0);
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removed += sqlite3_column_int(STMT_OLD, 1);
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HASH obj;
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for(int iter = 0; iter < 32; iter++)
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obj[iter] = hash[iter];
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out.push_back(obj);
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}
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sqlite3_reset(STMT_OLD);
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if(removed > bytesToFree)
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return out;
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sqlite3_bind_int(STMT_TO_FREE, 0, (int) bytesToFree);
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while(true) {
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int errc = sqlite3_step(STMT_TO_FREE);
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if(errc == SQLITE_DONE)
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break;
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else if(errc != SQLITE_ROW) {
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sqlite3_reset(STMT_TO_FREE);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_TO_FREE: " << sqlite3_errmsg(DB));
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}
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const uint8_t *hash = (const uint8_t*) sqlite3_column_blob(STMT_TO_FREE, 0);
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HASH obj;
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for(int iter = 0; iter < 32; iter++)
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obj[iter] = hash[iter];
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out.push_back(obj);
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}
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sqlite3_reset(STMT_TO_FREE);
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return out;
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}
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void CacheDatabase::remove(HASH hash) {
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sqlite3_bind_blob(STMT_REMOVE, 0, (const void*) hash.data(), 32, SQLITE_STATIC);
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if(sqlite3_step(STMT_REMOVE) != SQLITE_OK) {
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sqlite3_reset(STMT_REMOVE);
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MAKE_ERROR("Не удалось выполнить подготовленный запрос STMT_REMOVE: " << sqlite3_errmsg(DB));
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}
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sqlite3_reset(STMT_REMOVE);
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}
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std::string CacheDatabase::hashToString(HASH hash) {
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std::string text;
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text.reserve(64);
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for(int iter = 0; iter < 32; iter++) {
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int val = hash[31-iter] & 0xf;
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if(val > 9)
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text += 'a'+val-10;
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else
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text += '0'+val;
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val = (hash[31-iter] >> 4) & 0xf;
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if(val > 9)
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text += 'a'+val-10;
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else
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text += '0'+val;
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}
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return text;
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}
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int CacheDatabase::hexCharToInt(char c) {
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if (c >= '0' && c <= '9') return c - '0';
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if (c >= 'a' && c <= 'f') return c - 'a' + 10;
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throw std::invalid_argument("Invalid hexadecimal character");
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}
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CacheDatabase::HASH CacheDatabase::stringToHash(const std::string_view view) {
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if (view.size() != 64)
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throw std::invalid_argument("Hex string must be exactly 64 characters long");
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HASH hash;
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for (size_t i = 0; i < 32; ++i) {
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size_t offset = 62 - i * 2;
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int high = hexCharToInt(view[offset]);
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int low = hexCharToInt(view[offset + 1]);
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hash[i] = (high << 4) | low;
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}
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return hash;
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}
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CacheHandler::CacheHandler(boost::asio::io_context &ioc, const fs::path &cachePath)
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: IAsyncDestructible(ioc), Path(cachePath), DB(Path)
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{
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}
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CacheHandler::~CacheHandler() = default;
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std::pair<std::string, size_t> CacheHandler::getAll() {
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return DB.getAllHash();
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}
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coro<> CacheHandlerBasic::asyncDestructor() {
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NeedShutdown = true;
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co_await CacheHandler::asyncDestructor();
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}
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void CacheHandlerBasic::readThread(AsyncUseControl::Lock lock) {
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LOG.info() << "readThread started";
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while(!NeedShutdown) {
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if(ReadQueue.get_read().empty())
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goto wait;
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else {
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auto lock = ReadQueue.lock();
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if(lock->empty())
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goto wait;
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CacheDatabase::HASH hash = lock->front();
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lock->pop();
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lock.unlock();
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std::string name = CacheDatabase::hashToString(hash);
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fs::path path = Path / name.substr(0, 2) / name.substr(2, 2) / name.substr(4);
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std::shared_ptr<std::string> data = std::make_shared<std::string>();
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try {
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std::ifstream fd(path, std::ios::binary | std::ios::ate);
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if (!fd.is_open())
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MAKE_ERROR("!is_open(): " << fd.exceptions());
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if (fd.fail())
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MAKE_ERROR("fail(): " << fd.exceptions());
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std::ifstream::pos_type size = fd.tellg();
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fd.seekg(0, std::ios::beg);
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data->resize(size);
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fd.read(data->data(), size);
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if (!fd.good())
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MAKE_ERROR("!good(): " << fd.exceptions());
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} catch(const std::exception &exc) {
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LOG.error() << "Не удалось считать ресурс " << path.c_str() << ": " << exc.what();
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}
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ReadedQueue.lock()->emplace_back(hash, std::move(data));
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continue;
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}
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wait:
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TOS::Time::sleep3(20);
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}
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LOG.info() << "readThread ended";
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lock.unlock();
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}
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void CacheHandlerBasic::readWriteThread(AsyncUseControl::Lock lock) {
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LOG.info() << "readThread started";
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while(!NeedShutdown) {
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if(!ReadQueue.get_read().empty()) {
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auto lock = ReadQueue.lock();
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if(!lock->empty()) {
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CacheDatabase::HASH hash = lock->front();
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lock->pop();
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lock.unlock();
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std::string name = CacheDatabase::hashToString(hash);
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fs::path path = Path / name.substr(0, 2) / name.substr(2, 2) / name.substr(4);
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std::shared_ptr<std::string> data = std::make_shared<std::string>();
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try {
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std::ifstream fd(path, std::ios::binary | std::ios::ate);
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if (!fd.is_open())
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MAKE_ERROR("!is_open(): " << fd.exceptions());
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if (fd.fail())
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MAKE_ERROR("fail(): " << fd.exceptions());
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std::ifstream::pos_type size = fd.tellg();
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fd.seekg(0, std::ios::beg);
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data->resize(size);
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fd.read(data->data(), size);
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if (!fd.good())
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MAKE_ERROR("!good(): " << fd.exceptions());
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DB.updateTimeFor(hash);
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} catch(const std::exception &exc) {
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LOG.error() << "Не удалось считать ресурс " << path.c_str() << ": " << exc.what();
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}
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ReadedQueue.lock()->emplace_back(hash, std::move(data));
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continue;
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}
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}
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if(!WriteQueue.get_read().empty()) {
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auto lock = WriteQueue.lock();
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if(!lock->empty()) {
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DataTask task = lock->front();
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lock->pop();
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lock.unlock();
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std::string name = CacheDatabase::hashToString(task.Hash);
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fs::path path = Path / name.substr(0, 2) / name.substr(2, 2) / name.substr(4);
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try {
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// Проверка на наличие свободного места (виртуально)
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if(ssize_t free = ssize_t(MaxCacheDirectorySize)-DB.getCacheSize(); free < task.Data->size()) {
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// Недостаточно места, сколько необходимо освободить с запасом
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ssize_t need = task.Data->size()-free + 64*1024*1024;
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std::vector<CacheDatabase::HASH> hashes = DB.findExcessHashes(need, time(nullptr)-MaxLifeTime);
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LOG.warn() << "Удаление устаревшего кеша в количестве " << hashes.size() << "...";
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for(CacheDatabase::HASH hash : hashes) {
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std::string name = CacheDatabase::hashToString(task.Hash);
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fs::path path = Path / name.substr(0, 2) / name.substr(2, 2) / name.substr(4);
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DB.remove(hash);
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fs::remove(path);
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fs::path up1 = path.parent_path();
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LOG.info() << "В директории " << up1.c_str() << " не осталось файлов, удаляем...";
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size_t count = std::distance(fs::directory_iterator(up1), fs::directory_iterator());
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if(count == 0)
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fs::remove(up1);
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}
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}
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fs::create_directories(path.parent_path());
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std::ofstream fd(path, std::ios::binary | std::ios::ate);
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fd.write(task.Data->data(), task.Data->size());
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DB.insert(task.Hash, task.Data->size());
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} catch(const std::exception &exc) {
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LOG.error() << "Не удалось сохранить ресурс " << path.c_str() << ": " << exc.what();
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}
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}
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}
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TOS::Time::sleep3(20);
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}
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LOG.info() << "readWriteThread ended";
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lock.unlock();
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}
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CacheHandlerBasic::CacheHandlerBasic(boost::asio::io_context &ioc, const fs::path &cachePath)
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: CacheHandler(ioc, cachePath),
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ReadThread(&CacheHandlerBasic::readThread, this, AUC.use()),
|
||||
ReadWriteThread(&CacheHandlerBasic::readWriteThread, this, AUC.use())
|
||||
{
|
||||
LOG.info() << "Инициализировано хранилище кеша: " << cachePath.c_str();
|
||||
}
|
||||
|
||||
CacheHandlerBasic::~CacheHandlerBasic() {
|
||||
ReadThread.join();
|
||||
ReadWriteThread.join();
|
||||
LOG.info() << "ДеИнициализировано хранилище кеша: " << Path.c_str();
|
||||
}
|
||||
|
||||
void CacheHandlerBasic::pushWrite(std::string &&data, CacheDatabase::HASH hash) {
|
||||
std::shared_ptr<std::string> dat = std::make_shared<std::string>(std::move(data));
|
||||
WriteCache.lock()->push_back({hash, dat});
|
||||
WriteQueue.lock()->push({hash, dat});
|
||||
}
|
||||
|
||||
void CacheHandlerBasic::pushRead(CacheDatabase::HASH hash) {
|
||||
ReadQueue.lock()->push(hash);
|
||||
}
|
||||
|
||||
std::vector<std::pair<CacheDatabase::HASH, std::string>> CacheHandlerBasic::pullReads() {
|
||||
std::vector<DataTask> data;
|
||||
|
||||
{
|
||||
auto lock = ReadedQueue.lock();
|
||||
data = std::move(*lock);
|
||||
}
|
||||
|
||||
std::vector<std::pair<CacheDatabase::HASH, std::string>> out;
|
||||
out.reserve(data.size());
|
||||
|
||||
for(auto &value : data) {
|
||||
out.emplace_back(value.Hash, std::move(*value.Data));
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user