forked from lix-project/lix
* Retry a transaction if SQLite returns SQLITE_BUSY. This can happen
even with a very long busy timeout, because SQLITE_BUSY is also returned to resolve deadlocks. This should get rid of random "database is locked" errors. This is kind of hard to test though. * Fix a horrible bug in deleteFromStore(): deletePathWrapped() should be called after committing the transaction, not before, because the commit might not succeed.
This commit is contained in:
Eelco Dolstra
parent
365f3028dd
commit
de79d23f76
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@ -23,21 +23,30 @@
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namespace nix {
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class SQLiteError : public Error
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MakeError(SQLiteError, Error);
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MakeError(SQLiteBusy, SQLiteError);
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static void throwSQLiteError(sqlite3 * db, const format & f)
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__attribute__ ((noreturn));
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static void throwSQLiteError(sqlite3 * db, const format & f)
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{
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public:
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SQLiteError(sqlite3 * db, const format & f)
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: Error(format("%1%: %2%") % f.str() % sqlite3_errmsg(db))
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{
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int err = sqlite3_errcode(db);
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if (err == SQLITE_BUSY) {
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printMsg(lvlError, "warning: SQLite database is busy");
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throw SQLiteBusy(format("%1%: %2%") % f.str() % sqlite3_errmsg(db));
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}
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};
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else
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throw SQLiteError(format("%1%: %2%") % f.str() % sqlite3_errmsg(db));
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}
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SQLite::~SQLite()
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{
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try {
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if (db && sqlite3_close(db) != SQLITE_OK)
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throw SQLiteError(db, "closing database");
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throwSQLiteError(db, "closing database");
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} catch (...) {
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ignoreException();
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}
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@ -49,7 +58,7 @@ void SQLiteStmt::create(sqlite3 * db, const string & s)
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checkInterrupt();
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assert(!stmt);
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if (sqlite3_prepare_v2(db, s.c_str(), -1, &stmt, 0) != SQLITE_OK)
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throw SQLiteError(db, "creating statement");
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throwSQLiteError(db, "creating statement");
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this->db = db;
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}
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@ -58,7 +67,7 @@ void SQLiteStmt::reset()
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{
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assert(stmt);
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if (sqlite3_reset(stmt) != SQLITE_OK)
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throw SQLiteError(db, "resetting statement");
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throwSQLiteError(db, "resetting statement");
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curArg = 1;
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}
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@ -67,7 +76,7 @@ SQLiteStmt::~SQLiteStmt()
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{
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try {
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if (stmt && sqlite3_finalize(stmt) != SQLITE_OK)
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throw SQLiteError(db, "finalizing statement");
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throwSQLiteError(db, "finalizing statement");
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} catch (...) {
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ignoreException();
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}
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@ -77,28 +86,28 @@ SQLiteStmt::~SQLiteStmt()
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void SQLiteStmt::bind(const string & value)
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{
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if (sqlite3_bind_text(stmt, curArg++, value.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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throwSQLiteError(db, "binding argument");
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}
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void SQLiteStmt::bind(int value)
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{
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if (sqlite3_bind_int(stmt, curArg++, value) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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throwSQLiteError(db, "binding argument");
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}
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void SQLiteStmt::bind64(long long value)
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{
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if (sqlite3_bind_int64(stmt, curArg++, value) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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throwSQLiteError(db, "binding argument");
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}
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void SQLiteStmt::bind()
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{
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if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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throwSQLiteError(db, "binding argument");
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}
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@ -132,14 +141,14 @@ struct SQLiteTxn
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SQLiteTxn(sqlite3 * db) : active(false) {
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this->db = db;
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if (sqlite3_exec(db, "begin;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "starting transaction");
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throwSQLiteError(db, "starting transaction");
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active = true;
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}
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void commit()
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{
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if (sqlite3_exec(db, "commit;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "committing transaction");
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throwSQLiteError(db, "committing transaction");
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active = false;
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}
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@ -147,7 +156,7 @@ struct SQLiteTxn
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{
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try {
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if (active && sqlite3_exec(db, "rollback;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "aborting transaction");
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throwSQLiteError(db, "aborting transaction");
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} catch (...) {
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ignoreException();
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}
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@ -289,10 +298,10 @@ void LocalStore::openDB(bool create)
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throw Error("cannot open SQLite database");
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if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK)
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throw SQLiteError(db, "setting timeout");
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throwSQLiteError(db, "setting timeout");
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if (sqlite3_exec(db, "pragma foreign_keys = 1;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "enabling foreign keys");
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throwSQLiteError(db, "enabling foreign keys");
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/* !!! check whether sqlite has been built with foreign key
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support */
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@ -303,7 +312,7 @@ void LocalStore::openDB(bool create)
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crashes. */
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string syncMode = queryBoolSetting("fsync-metadata", true) ? "normal" : "off";
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if (sqlite3_exec(db, ("pragma synchronous = " + syncMode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "setting synchronous mode");
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throwSQLiteError(db, "setting synchronous mode");
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/* Set the SQLite journal mode. WAL mode is fastest, but doesn't
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seem entirely stable at the moment (Oct. 2010). Thus, use
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SQLiteStmt stmt;
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stmt.create(db, "pragma main.journal_mode;");
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if (sqlite3_step(stmt) != SQLITE_ROW)
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throw SQLiteError(db, "querying journal mode");
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throwSQLiteError(db, "querying journal mode");
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prevMode = string((const char *) sqlite3_column_text(stmt, 0));
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}
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if (prevMode != mode &&
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sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "setting journal mode");
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throwSQLiteError(db, "setting journal mode");
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/* Increase the auto-checkpoint interval to 8192 pages. This
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seems enough to ensure that instantiating the NixOS system
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derivation is done in a single fsync(). */
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if (sqlite3_exec(db, "pragma wal_autocheckpoint = 8192;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "setting autocheckpoint interval");
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throwSQLiteError(db, "setting autocheckpoint interval");
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/* Initialise the database schema, if necessary. */
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if (create) {
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#include "schema.sql.hh"
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if (sqlite3_exec(db, (const char *) schema, 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "initialising database schema");
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throwSQLiteError(db, "initialising database schema");
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}
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/* Backwards compatibility with old (pre-release) databases. Can
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remove this eventually. */
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if (sqlite3_table_column_metadata(db, 0, "ValidPaths", "narSize", 0, 0, 0, 0, 0) != SQLITE_OK) {
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if (sqlite3_exec(db, "alter table ValidPaths add column narSize integer" , 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "adding column narSize");
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throwSQLiteError(db, "adding column narSize");
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}
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/* Prepare SQL statements. */
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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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throw SQLiteError(db, format("registering valid path `%1%' in database") % info.path);
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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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/* If this is a derivation, then store the derivation outputs in
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@ -475,7 +484,7 @@ unsigned long long LocalStore::addValidPath(const ValidPathInfo & info)
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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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throw SQLiteError(db, format("adding derivation output for `%1%' in database") % info.path);
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throwSQLiteError(db, format("adding derivation output for `%1%' in database") % info.path);
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}
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}
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@ -489,7 +498,7 @@ void LocalStore::addReference(unsigned long long referrer, unsigned long long re
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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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throw SQLiteError(db, "adding reference to database");
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throwSQLiteError(db, "adding reference to database");
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}
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@ -499,14 +508,22 @@ void LocalStore::registerValidPath(const ValidPathInfo & info)
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ValidPathInfo info2(info);
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if (info2.registrationTime == 0) info2.registrationTime = time(0);
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SQLiteTxn txn(db);
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while (1) {
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try {
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SQLiteTxn txn(db);
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unsigned long long id = addValidPath(info2);
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unsigned long long id = addValidPath(info2);
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foreach (PathSet::const_iterator, i, info2.references)
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addReference(id, queryValidPathId(*i));
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foreach (PathSet::const_iterator, i, info2.references)
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addReference(id, queryValidPathId(*i));
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txn.commit();
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txn.commit();
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break;
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} catch (SQLiteBusy & e) {
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/* Retry; the `txn' destructor will roll back the current
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transaction. */
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}
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}
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}
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@ -517,7 +534,7 @@ void LocalStore::registerFailedPath(const Path & path)
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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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throw SQLiteError(db, format("registering failed path `%1%'") % path);
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throwSQLiteError(db, format("registering failed path `%1%'") % path);
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}
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@ -527,7 +544,7 @@ bool LocalStore::hasPathFailed(const Path & path)
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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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throw SQLiteError(db, "querying whether path failed");
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throwSQLiteError(db, "querying whether path failed");
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return res == SQLITE_ROW;
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}
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@ -545,7 +562,7 @@ PathSet LocalStore::queryFailedPaths()
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}
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if (r != SQLITE_DONE)
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throw SQLiteError(db, "error querying failed paths");
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throwSQLiteError(db, "error querying failed paths");
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return res;
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}
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@ -559,7 +576,7 @@ void LocalStore::clearFailedPaths(const PathSet & 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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throw SQLiteError(db, format("clearing failed path `%1%' in database") % *i);
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throwSQLiteError(db, format("clearing failed path `%1%' in database") % *i);
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}
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txn.commit();
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@ -594,7 +611,7 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & 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) throw SQLiteError(db, "querying path in database");
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if (r != SQLITE_ROW) throwSQLiteError(db, "querying path in database");
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info.id = sqlite3_column_int(stmtQueryPathInfo, 0);
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@ -622,7 +639,7 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path)
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}
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if (r != SQLITE_DONE)
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throw SQLiteError(db, format("error getting references of `%1%'") % path);
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throwSQLiteError(db, format("error getting references of `%1%'") % path);
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return info;
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}
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@ -635,7 +652,7 @@ unsigned long long LocalStore::queryValidPathId(const Path & 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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throw SQLiteError(db, "querying path in database");
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throwSQLiteError(db, "querying path in database");
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}
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@ -645,7 +662,7 @@ bool LocalStore::isValidPath(const Path & path)
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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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throw SQLiteError(db, "querying path in database");
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throwSQLiteError(db, "querying path in database");
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return res == SQLITE_ROW;
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}
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@ -665,7 +682,7 @@ PathSet LocalStore::queryValidPaths()
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}
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if (r != SQLITE_DONE)
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throw SQLiteError(db, "error getting valid paths");
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throwSQLiteError(db, "error getting valid paths");
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return res;
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}
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@ -695,7 +712,7 @@ void LocalStore::queryReferrers(const Path & path, PathSet & referrers)
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}
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if (r != SQLITE_DONE)
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throw SQLiteError(db, format("error getting references of `%1%'") % path);
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throwSQLiteError(db, format("error getting references of `%1%'") % path);
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}
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@ -721,7 +738,7 @@ PathSet LocalStore::queryValidDerivers(const Path & path)
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}
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if (r != SQLITE_DONE)
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throw SQLiteError(db, format("error getting valid derivers of `%1%'") % path);
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throwSQLiteError(db, format("error getting valid derivers of `%1%'") % path);
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return derivers;
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}
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@ -743,7 +760,7 @@ PathSet LocalStore::queryDerivationOutputs(const Path & path)
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}
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if (r != SQLITE_DONE)
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throw SQLiteError(db, format("error getting outputs of `%1%'") % path);
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throwSQLiteError(db, format("error getting outputs of `%1%'") % path);
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return outputs;
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}
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@ -890,7 +907,7 @@ void LocalStore::invalidatePath(const Path & path)
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stmtInvalidatePath.bind(path);
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if (sqlite3_step(stmtInvalidatePath) != SQLITE_DONE)
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throw SQLiteError(db, format("invalidating path `%1%' in database") % path);
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throwSQLiteError(db, format("invalidating path `%1%' in database") % path);
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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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@ -1248,20 +1265,25 @@ void LocalStore::deleteFromStore(const Path & path, unsigned long long & bytesFr
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assertStorePath(path);
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SQLiteTxn txn(db);
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while (1) {
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try {
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SQLiteTxn txn(db);
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if (isValidPath(path)) {
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PathSet referrers; queryReferrers(path, referrers);
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referrers.erase(path); /* ignore self-references */
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if (!referrers.empty())
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throw PathInUse(format("cannot delete path `%1%' because it is in use by `%2%'")
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% path % showPaths(referrers));
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invalidatePath(path);
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if (isValidPath(path)) {
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PathSet referrers; queryReferrers(path, referrers);
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referrers.erase(path); /* ignore self-references */
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if (!referrers.empty())
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throw PathInUse(format("cannot delete path `%1%' because it is in use by `%2%'")
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% path % showPaths(referrers));
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invalidatePath(path);
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}
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txn.commit();
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break;
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} catch (SQLiteBusy & e) { };
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}
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deletePathWrapped(path, bytesFreed, blocksFreed);
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txn.commit();
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}
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