Improve the SQLite wrapper API
In particular, this eliminates a bunch of boilerplate code.
This commit is contained in:
Eelco Dolstra
parent
d9c5e3bbf0
commit
3d119f0a3b
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@ -332,6 +332,7 @@ void LocalStore::openDB(bool create)
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// ensure efficient lookup.
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stmtQueryPathFromHashPart.create(db,
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"select path from ValidPaths where path >= ? limit 1;");
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stmtQueryValidPaths.create(db, "select path from ValidPaths");
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}
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@ -526,23 +527,16 @@ void LocalStore::checkDerivationOutputs(const Path & drvPath, const Derivation &
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}
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unsigned long long LocalStore::addValidPath(const ValidPathInfo & info, bool checkOutputs)
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uint64_t LocalStore::addValidPath(const ValidPathInfo & info, bool checkOutputs)
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{
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SQLiteStmtUse use(stmtRegisterValidPath);
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stmtRegisterValidPath.bind(info.path);
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stmtRegisterValidPath.bind("sha256:" + printHash(info.narHash));
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stmtRegisterValidPath.bind(info.registrationTime == 0 ? time(0) : info.registrationTime);
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if (info.deriver != "")
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stmtRegisterValidPath.bind(info.deriver);
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else
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stmtRegisterValidPath.bind(); // null
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if (info.narSize != 0)
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stmtRegisterValidPath.bind64(info.narSize);
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else
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stmtRegisterValidPath.bind(); // null
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if (sqlite3_step(stmtRegisterValidPath) != SQLITE_DONE)
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throwSQLiteError(db, format("registering valid path ‘%1%’ in database") % info.path);
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unsigned long long id = sqlite3_last_insert_rowid(db);
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stmtRegisterValidPath.use()
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(info.path)
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("sha256:" + printHash(info.narHash))
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(info.registrationTime == 0 ? time(0) : info.registrationTime)
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(info.deriver, info.deriver != "")
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(info.narSize, info.narSize != 0)
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.exec();
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uint64_t id = sqlite3_last_insert_rowid(db);
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/* If this is a derivation, then store the derivation outputs in
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the database. This is useful for the garbage collector: it can
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@ -559,12 +553,11 @@ unsigned long long LocalStore::addValidPath(const ValidPathInfo & info, bool che
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if (checkOutputs) checkDerivationOutputs(info.path, drv);
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for (auto & i : drv.outputs) {
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SQLiteStmtUse use(stmtAddDerivationOutput);
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stmtAddDerivationOutput.bind(id);
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stmtAddDerivationOutput.bind(i.first);
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stmtAddDerivationOutput.bind(i.second.path);
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if (sqlite3_step(stmtAddDerivationOutput) != SQLITE_DONE)
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throwSQLiteError(db, format("adding derivation output for ‘%1%’ in database") % info.path);
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stmtAddDerivationOutput.use()
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(id)
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(i.first)
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(i.second.path)
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.exec();
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}
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}
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@ -572,24 +565,16 @@ unsigned long long LocalStore::addValidPath(const ValidPathInfo & info, bool che
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}
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void LocalStore::addReference(unsigned long long referrer, unsigned long long reference)
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void LocalStore::addReference(uint64_t referrer, uint64_t reference)
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{
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SQLiteStmtUse use(stmtAddReference);
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stmtAddReference.bind(referrer);
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stmtAddReference.bind(reference);
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if (sqlite3_step(stmtAddReference) != SQLITE_DONE)
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throwSQLiteError(db, "adding reference to database");
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stmtAddReference.use()(referrer)(reference).exec();
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}
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void LocalStore::registerFailedPath(const Path & path)
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{
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retrySQLite<void>([&]() {
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SQLiteStmtUse use(stmtRegisterFailedPath);
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stmtRegisterFailedPath.bind(path);
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stmtRegisterFailedPath.bind(time(0));
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if (sqlite3_step(stmtRegisterFailedPath) != SQLITE_DONE)
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throwSQLiteError(db, format("registering failed path ‘%1%’") % path);
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stmtRegisterFailedPath.use()(path)(time(0)).step();
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});
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}
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@ -597,12 +582,7 @@ void LocalStore::registerFailedPath(const Path & path)
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bool LocalStore::hasPathFailed(const Path & path)
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{
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return retrySQLite<bool>([&]() {
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SQLiteStmtUse use(stmtHasPathFailed);
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stmtHasPathFailed.bind(path);
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int res = sqlite3_step(stmtHasPathFailed);
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if (res != SQLITE_DONE && res != SQLITE_ROW)
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throwSQLiteError(db, "querying whether path failed");
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return res == SQLITE_ROW;
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return stmtHasPathFailed.use()(path).next();
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});
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}
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@ -610,18 +590,11 @@ bool LocalStore::hasPathFailed(const Path & path)
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PathSet LocalStore::queryFailedPaths()
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{
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return retrySQLite<PathSet>([&]() {
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SQLiteStmtUse use(stmtQueryFailedPaths);
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auto useQueryFailedPaths(stmtQueryFailedPaths.use());
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PathSet res;
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int r;
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while ((r = sqlite3_step(stmtQueryFailedPaths)) == SQLITE_ROW) {
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const char * s = (const char *) sqlite3_column_text(stmtQueryFailedPaths, 0);
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assert(s);
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res.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, "error querying failed paths");
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while (useQueryFailedPaths.next())
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res.insert(useQueryFailedPaths.getStr(0));
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return res;
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});
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@ -633,12 +606,8 @@ void LocalStore::clearFailedPaths(const PathSet & paths)
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retrySQLite<void>([&]() {
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SQLiteTxn txn(db);
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for (auto & i : paths) {
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SQLiteStmtUse use(stmtClearFailedPath);
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stmtClearFailedPath.bind(i);
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if (sqlite3_step(stmtClearFailedPath) != SQLITE_DONE)
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throwSQLiteError(db, format("clearing failed path ‘%1%’ in database") % i);
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}
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for (auto & path : paths)
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stmtClearFailedPath.use()(path).exec();
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txn.commit();
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});
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@ -669,41 +638,28 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path)
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return retrySQLite<ValidPathInfo>([&]() {
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/* Get the path info. */
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SQLiteStmtUse use1(stmtQueryPathInfo);
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auto useQueryPathInfo(stmtQueryPathInfo.use()(path));
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stmtQueryPathInfo.bind(path);
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if (!useQueryPathInfo.next())
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throw Error(format("path ‘%1%’ is not valid") % path);
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int r = sqlite3_step(stmtQueryPathInfo);
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if (r == SQLITE_DONE) throw Error(format("path ‘%1%’ is not valid") % path);
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if (r != SQLITE_ROW) throwSQLiteError(db, "querying path in database");
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info.id = useQueryPathInfo.getInt(0);
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info.id = sqlite3_column_int(stmtQueryPathInfo, 0);
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info.narHash = parseHashField(path, useQueryPathInfo.getStr(1));
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const char * s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 1);
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assert(s);
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info.narHash = parseHashField(path, s);
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info.registrationTime = useQueryPathInfo.getInt(2);
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info.registrationTime = sqlite3_column_int(stmtQueryPathInfo, 2);
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s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 3);
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auto s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 3);
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if (s) info.deriver = s;
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/* Note that narSize = NULL yields 0. */
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info.narSize = sqlite3_column_int64(stmtQueryPathInfo, 4);
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info.narSize = useQueryPathInfo.getInt(4);
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/* Get the references. */
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SQLiteStmtUse use2(stmtQueryReferences);
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auto useQueryReferences(stmtQueryReferences.use()(info.id));
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stmtQueryReferences.bind(info.id);
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while ((r = sqlite3_step(stmtQueryReferences)) == SQLITE_ROW) {
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s = (const char *) sqlite3_column_text(stmtQueryReferences, 0);
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assert(s);
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info.references.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, format("error getting references of ‘%1%’") % path);
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while (useQueryReferences.next())
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info.references.insert(useQueryReferences.getStr(0));
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return info;
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});
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@ -714,37 +670,26 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path)
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narSize field. */
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void LocalStore::updatePathInfo(const ValidPathInfo & info)
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{
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SQLiteStmtUse use(stmtUpdatePathInfo);
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if (info.narSize != 0)
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stmtUpdatePathInfo.bind64(info.narSize);
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else
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stmtUpdatePathInfo.bind(); // null
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stmtUpdatePathInfo.bind("sha256:" + printHash(info.narHash));
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stmtUpdatePathInfo.bind(info.path);
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if (sqlite3_step(stmtUpdatePathInfo) != SQLITE_DONE)
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throwSQLiteError(db, format("updating info of path ‘%1%’ in database") % info.path);
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stmtUpdatePathInfo.use()
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(info.narSize, info.narSize != 0)
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("sha256:" + printHash(info.narHash))
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(info.path)
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.exec();
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}
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unsigned long long LocalStore::queryValidPathId(const Path & path)
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uint64_t LocalStore::queryValidPathId(const Path & path)
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{
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SQLiteStmtUse use(stmtQueryPathInfo);
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stmtQueryPathInfo.bind(path);
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int res = sqlite3_step(stmtQueryPathInfo);
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if (res == SQLITE_ROW) return sqlite3_column_int(stmtQueryPathInfo, 0);
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if (res == SQLITE_DONE) throw Error(format("path ‘%1%’ is not valid") % path);
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throwSQLiteError(db, "querying path in database");
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auto use(stmtQueryPathInfo.use()(path));
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if (!use.next())
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throw Error(format("path ‘%1%’ is not valid") % path);
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return use.getInt(0);
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}
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bool LocalStore::isValidPath_(const Path & path)
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{
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SQLiteStmtUse use(stmtQueryPathInfo);
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stmtQueryPathInfo.bind(path);
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int res = sqlite3_step(stmtQueryPathInfo);
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if (res != SQLITE_DONE && res != SQLITE_ROW)
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throwSQLiteError(db, "querying path in database");
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return res == SQLITE_ROW;
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return stmtQueryPathInfo.use()(path).next();
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}
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@ -770,20 +715,9 @@ PathSet LocalStore::queryValidPaths(const PathSet & paths)
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PathSet LocalStore::queryAllValidPaths()
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{
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return retrySQLite<PathSet>([&]() {
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SQLiteStmt stmt;
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stmt.create(db, "select path from ValidPaths");
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auto use(stmtQueryValidPaths.use());
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PathSet res;
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int r;
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while ((r = sqlite3_step(stmt)) == SQLITE_ROW) {
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const char * s = (const char *) sqlite3_column_text(stmt, 0);
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assert(s);
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res.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, "error getting valid paths");
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while (use.next()) res.insert(use.getStr(0));
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return res;
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});
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}
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@ -791,19 +725,10 @@ PathSet LocalStore::queryAllValidPaths()
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void LocalStore::queryReferrers_(const Path & path, PathSet & referrers)
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{
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SQLiteStmtUse use(stmtQueryReferrers);
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auto useQueryReferrers(stmtQueryReferrers.use()(path));
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stmtQueryReferrers.bind(path);
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int r;
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while ((r = sqlite3_step(stmtQueryReferrers)) == SQLITE_ROW) {
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const char * s = (const char *) sqlite3_column_text(stmtQueryReferrers, 0);
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assert(s);
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referrers.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, format("error getting references of ‘%1%’") % path);
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while (useQueryReferrers.next())
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referrers.insert(useQueryReferrers.getStr(0));
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}
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@ -827,19 +752,11 @@ PathSet LocalStore::queryValidDerivers(const Path & path)
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assertStorePath(path);
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return retrySQLite<PathSet>([&]() {
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SQLiteStmtUse use(stmtQueryValidDerivers);
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stmtQueryValidDerivers.bind(path);
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auto useQueryValidDerivers(stmtQueryValidDerivers.use()(path));
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PathSet derivers;
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int r;
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while ((r = sqlite3_step(stmtQueryValidDerivers)) == SQLITE_ROW) {
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const char * s = (const char *) sqlite3_column_text(stmtQueryValidDerivers, 1);
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assert(s);
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derivers.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, format("error getting valid derivers of ‘%1%’") % path);
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while (useQueryValidDerivers.next())
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derivers.insert(useQueryValidDerivers.getStr(1));
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return derivers;
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});
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@ -849,19 +766,11 @@ PathSet LocalStore::queryValidDerivers(const Path & path)
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PathSet LocalStore::queryDerivationOutputs(const Path & path)
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{
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return retrySQLite<PathSet>([&]() {
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SQLiteStmtUse use(stmtQueryDerivationOutputs);
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stmtQueryDerivationOutputs.bind(queryValidPathId(path));
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auto useQueryDerivationOutputs(stmtQueryDerivationOutputs.use()(queryValidPathId(path)));
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PathSet outputs;
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int r;
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while ((r = sqlite3_step(stmtQueryDerivationOutputs)) == SQLITE_ROW) {
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const char * s = (const char *) sqlite3_column_text(stmtQueryDerivationOutputs, 1);
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assert(s);
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outputs.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, format("error getting outputs of ‘%1%’") % path);
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while (useQueryDerivationOutputs.next())
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outputs.insert(useQueryDerivationOutputs.getStr(1));
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return outputs;
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});
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@ -871,19 +780,11 @@ PathSet LocalStore::queryDerivationOutputs(const Path & path)
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StringSet LocalStore::queryDerivationOutputNames(const Path & path)
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{
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return retrySQLite<StringSet>([&]() {
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SQLiteStmtUse use(stmtQueryDerivationOutputs);
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stmtQueryDerivationOutputs.bind(queryValidPathId(path));
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auto useQueryDerivationOutputs(stmtQueryDerivationOutputs.use()(queryValidPathId(path)));
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StringSet outputNames;
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int r;
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while ((r = sqlite3_step(stmtQueryDerivationOutputs)) == SQLITE_ROW) {
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const char * s = (const char *) sqlite3_column_text(stmtQueryDerivationOutputs, 0);
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assert(s);
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outputNames.insert(s);
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}
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if (r != SQLITE_DONE)
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throwSQLiteError(db, format("error getting output names of ‘%1%’") % path);
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while (useQueryDerivationOutputs.next())
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outputNames.insert(useQueryDerivationOutputs.getStr(0));
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return outputNames;
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});
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@ -897,12 +798,9 @@ Path LocalStore::queryPathFromHashPart(const string & hashPart)
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Path prefix = settings.nixStore + "/" + hashPart;
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return retrySQLite<Path>([&]() {
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SQLiteStmtUse use(stmtQueryPathFromHashPart);
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stmtQueryPathFromHashPart.bind(prefix);
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auto useQueryPathFromHashPart(stmtQueryPathFromHashPart.use()(prefix));
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int res = sqlite3_step(stmtQueryPathFromHashPart);
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if (res == SQLITE_DONE) return "";
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if (res != SQLITE_ROW) throwSQLiteError(db, "finding path in database");
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if (!useQueryPathFromHashPart.next()) return "";
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const char * s = (const char *) sqlite3_column_text(stmtQueryPathFromHashPart, 0);
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return s && prefix.compare(0, prefix.size(), s, prefix.size()) == 0 ? s : "";
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@ -1143,7 +1041,7 @@ void LocalStore::registerValidPaths(const ValidPathInfos & infos)
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}
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for (auto & i : infos) {
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unsigned long long referrer = queryValidPathId(i.path);
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auto referrer = queryValidPathId(i.path);
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for (auto & j : i.references)
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addReference(referrer, queryValidPathId(j));
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}
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@ -1178,12 +1076,7 @@ void LocalStore::invalidatePath(const Path & path)
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drvHashes.erase(path);
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SQLiteStmtUse use(stmtInvalidatePath);
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stmtInvalidatePath.bind(path);
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if (sqlite3_step(stmtInvalidatePath) != SQLITE_DONE)
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throwSQLiteError(db, format("invalidating path ‘%1%’ in database") % path);
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stmtInvalidatePath.use()(path).exec();
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/* Note that the foreign key constraints on the Refs table take
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care of deleting the references entries for `path'. */
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@ -208,6 +208,7 @@ private:
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SQLiteStmt stmtQueryValidDerivers;
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SQLiteStmt stmtQueryDerivationOutputs;
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SQLiteStmt stmtQueryPathFromHashPart;
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SQLiteStmt stmtQueryValidPaths;
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/* Cache for pathContentsGood(). */
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std::map<Path, bool> pathContentsGoodCache;
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@ -230,11 +231,11 @@ private:
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void makeStoreWritable();
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unsigned long long queryValidPathId(const Path & path);
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uint64_t queryValidPathId(const Path & path);
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unsigned long long addValidPath(const ValidPathInfo & info, bool checkOutputs = true);
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uint64_t addValidPath(const ValidPathInfo & info, bool checkOutputs = true);
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void addReference(unsigned long long referrer, unsigned long long reference);
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void addReference(uint64_t referrer, uint64_t reference);
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void appendReferrer(const Path & from, const Path & to, bool lock);
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@ -53,15 +53,6 @@ void SQLiteStmt::create(sqlite3 * db, const string & s)
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this->db = db;
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}
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void SQLiteStmt::reset()
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{
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assert(stmt);
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/* Note: sqlite3_reset() returns the error code for the most
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recent call to sqlite3_step(). So ignore it. */
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sqlite3_reset(stmt);
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curArg = 1;
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}
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SQLiteStmt::~SQLiteStmt()
|
||||
{
|
||||
try {
|
||||
|
|
@ -72,43 +63,74 @@ SQLiteStmt::~SQLiteStmt()
|
|||
}
|
||||
}
|
||||
|
||||
void SQLiteStmt::bind(const string & value)
|
||||
{
|
||||
if (sqlite3_bind_text(stmt, curArg++, value.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
|
||||
throwSQLiteError(db, "binding argument");
|
||||
}
|
||||
|
||||
void SQLiteStmt::bind(int value)
|
||||
{
|
||||
if (sqlite3_bind_int(stmt, curArg++, value) != SQLITE_OK)
|
||||
throwSQLiteError(db, "binding argument");
|
||||
}
|
||||
|
||||
void SQLiteStmt::bind64(long long value)
|
||||
{
|
||||
if (sqlite3_bind_int64(stmt, curArg++, value) != SQLITE_OK)
|
||||
throwSQLiteError(db, "binding argument");
|
||||
}
|
||||
|
||||
void SQLiteStmt::bind()
|
||||
{
|
||||
if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK)
|
||||
throwSQLiteError(db, "binding argument");
|
||||
}
|
||||
|
||||
SQLiteStmtUse::SQLiteStmtUse(SQLiteStmt & stmt)
|
||||
SQLiteStmt::Use::Use(SQLiteStmt & stmt)
|
||||
: stmt(stmt)
|
||||
{
|
||||
stmt.reset();
|
||||
assert(stmt.stmt);
|
||||
/* Note: sqlite3_reset() returns the error code for the most
|
||||
recent call to sqlite3_step(). So ignore it. */
|
||||
sqlite3_reset(stmt);
|
||||
}
|
||||
|
||||
SQLiteStmtUse::~SQLiteStmtUse()
|
||||
SQLiteStmt::Use & SQLiteStmt::Use::operator () (const std::string & value, bool notNull)
|
||||
{
|
||||
try {
|
||||
stmt.reset();
|
||||
} catch (...) {
|
||||
ignoreException();
|
||||
}
|
||||
if (notNull) {
|
||||
if (sqlite3_bind_text(stmt, curArg++, value.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
|
||||
throwSQLiteError(stmt.db, "binding argument");
|
||||
} else
|
||||
bind();
|
||||
return *this;
|
||||
}
|
||||
|
||||
SQLiteStmt::Use & SQLiteStmt::Use::operator () (int64_t value, bool notNull)
|
||||
{
|
||||
if (notNull) {
|
||||
if (sqlite3_bind_int64(stmt, curArg++, value) != SQLITE_OK)
|
||||
throwSQLiteError(stmt.db, "binding argument");
|
||||
} else
|
||||
bind();
|
||||
return *this;
|
||||
}
|
||||
|
||||
SQLiteStmt::Use & SQLiteStmt::Use::bind()
|
||||
{
|
||||
if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK)
|
||||
throwSQLiteError(stmt.db, "binding argument");
|
||||
return *this;
|
||||
}
|
||||
|
||||
int SQLiteStmt::Use::step()
|
||||
{
|
||||
return sqlite3_step(stmt);
|
||||
}
|
||||
|
||||
void SQLiteStmt::Use::exec()
|
||||
{
|
||||
int r = step();
|
||||
assert(r != SQLITE_ROW);
|
||||
if (r != SQLITE_DONE)
|
||||
throwSQLiteError(stmt.db, "executing SQLite statement");
|
||||
}
|
||||
|
||||
bool SQLiteStmt::Use::next()
|
||||
{
|
||||
int r = step();
|
||||
if (r != SQLITE_DONE && r != SQLITE_ROW)
|
||||
throwSQLiteError(stmt.db, "executing SQLite query");
|
||||
return r == SQLITE_ROW;
|
||||
}
|
||||
|
||||
std::string SQLiteStmt::Use::getStr(int col)
|
||||
{
|
||||
auto s = (const char *) sqlite3_column_text(stmt, col);
|
||||
assert(s);
|
||||
return s;
|
||||
}
|
||||
|
||||
int64_t SQLiteStmt::Use::getInt(int col)
|
||||
{
|
||||
// FIXME: detect nulls?
|
||||
return sqlite3_column_int64(stmt, col);
|
||||
}
|
||||
|
||||
SQLiteTxn::SQLiteTxn(sqlite3 * db)
|
||||
|
|
|
|||
|
|
@ -22,29 +22,46 @@ struct SQLite
|
|||
/* RAII wrapper to create and destroy SQLite prepared statements. */
|
||||
struct SQLiteStmt
|
||||
{
|
||||
sqlite3 * db;
|
||||
sqlite3_stmt * stmt;
|
||||
unsigned int curArg;
|
||||
SQLiteStmt() { stmt = 0; }
|
||||
sqlite3 * db = 0;
|
||||
sqlite3_stmt * stmt = 0;
|
||||
SQLiteStmt() { }
|
||||
void create(sqlite3 * db, const std::string & s);
|
||||
void reset();
|
||||
~SQLiteStmt();
|
||||
operator sqlite3_stmt * () { return stmt; }
|
||||
void bind(const std::string & value);
|
||||
void bind(int value);
|
||||
void bind64(long long value);
|
||||
void bind();
|
||||
};
|
||||
|
||||
/* Helper class to ensure that prepared statements are reset when
|
||||
leaving the scope that uses them. Unfinished prepared statements
|
||||
prevent transactions from being aborted, and can cause locks to be
|
||||
kept when they should be released. */
|
||||
struct SQLiteStmtUse
|
||||
{
|
||||
SQLiteStmt & stmt;
|
||||
SQLiteStmtUse(SQLiteStmt & stmt);
|
||||
~SQLiteStmtUse();
|
||||
/* Helper for binding / executing statements. */
|
||||
class Use
|
||||
{
|
||||
friend struct SQLiteStmt;
|
||||
private:
|
||||
SQLiteStmt & stmt;
|
||||
unsigned int curArg = 1;
|
||||
Use(SQLiteStmt & stmt);
|
||||
|
||||
public:
|
||||
|
||||
/* Bind the next parameter. */
|
||||
Use & operator () (const std::string & value, bool notNull = true);
|
||||
Use & operator () (int64_t value, bool notNull = true);
|
||||
Use & bind(); // null
|
||||
|
||||
int step();
|
||||
|
||||
/* Execute a statement that does not return rows. */
|
||||
void exec();
|
||||
|
||||
/* For statements that return 0 or more rows. Returns true iff
|
||||
a row is available. */
|
||||
bool next();
|
||||
|
||||
std::string getStr(int col);
|
||||
int64_t getInt(int col);
|
||||
};
|
||||
|
||||
Use use()
|
||||
{
|
||||
return Use(*this);
|
||||
}
|
||||
};
|
||||
|
||||
/* RAII helper that ensures transactions are aborted unless explicitly
|
||||
|
|
|
|||
|
|
@ -96,8 +96,8 @@ struct ValidPathInfo
|
|||
Hash narHash;
|
||||
PathSet references;
|
||||
time_t registrationTime = 0;
|
||||
unsigned long long narSize = 0; // 0 = unknown
|
||||
unsigned long long id; // internal use only
|
||||
uint64_t narSize = 0; // 0 = unknown
|
||||
uint64_t id; // internal use only
|
||||
|
||||
/* Whether the path is ultimately trusted, that is, it was built
|
||||
locally or is content-addressable (e.g. added via addToStore()
|
||||
|
|
|
|||
Loading…
Reference in a new issue