forked from lix-project/lix
* Started using Berkeley DB environments. This is necessary for
transaction support (but we don't actually use transactions yet).
This commit is contained in:
Eelco Dolstra
parent
758bd4673a
commit
4a013962bd
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@ -42,6 +42,7 @@ nix.o: nix-help.txt.hh
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install-data-local:
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$(INSTALL) -d $(localstatedir)/nix
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$(INSTALL) -d $(localstatedir)/nix/db
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$(INSTALL) -d $(localstatedir)/nix/links
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ln -sf $(localstatedir)/nix/links/current $(prefix)/current
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$(INSTALL) -d $(localstatedir)/log/nix
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170
src/db.cc
170
src/db.cc
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@ -3,66 +3,142 @@
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#include <memory>
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#include <db_cxx.h>
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/* Wrapper classes that ensures that the database is closed upon
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object destruction. */
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class Db2 : public Db
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/* Wrapper class to ensure proper destruction. */
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class DestroyDb
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{
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Db * db;
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public:
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Db2(DbEnv *env, u_int32_t flags) : Db(env, flags) { }
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~Db2() { close(0); }
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DestroyDb(Db * _db) : db(_db) { }
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~DestroyDb() { db->close(0); delete db; }
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};
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class DbcClose
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class DestroyDbc
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{
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Dbc * cursor;
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Dbc * dbc;
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public:
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DbcClose(Dbc * c) : cursor(c) { }
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~DbcClose() { cursor->close(); }
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DestroyDbc(Dbc * _dbc) : dbc(_dbc) { }
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~DestroyDbc() { dbc->close(); /* close() frees dbc */ }
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};
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static auto_ptr<Db2> openDB(const string & filename, const string & dbname,
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bool readonly)
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{
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auto_ptr<Db2> db(new Db2(0, 0));
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db->open(filename.c_str(), dbname.c_str(),
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DB_HASH, readonly ? DB_RDONLY : DB_CREATE, 0666);
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return db;
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}
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static void rethrow(DbException & e)
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{
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throw Error(e.what());
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}
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void createDB(const string & filename, const string & dbname)
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Transaction::Transaction()
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: txn(0)
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{
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}
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Transaction::Transaction(Database & db)
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{
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db.requireEnv();
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db.env->txn_begin(0, &txn, 0);
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}
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Transaction::~Transaction()
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{
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if (txn) {
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txn->abort();
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txn = 0;
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}
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}
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void Transaction::commit()
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{
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if (!txn) throw Error("commit called on null transaction");
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txn->commit(0);
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txn = 0;
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}
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void Database::requireEnv()
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{
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if (!env) throw Error("database environment not open");
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}
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Db * Database::openDB(const Transaction & txn,
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const string & table, bool create)
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{
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requireEnv();
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Db * db = new Db(env, 0);
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try {
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// !!! fixme when switching to BDB 4.1: use txn.
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db->open(table.c_str(), 0,
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DB_HASH, create ? DB_CREATE : 0, 0666);
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} catch (...) {
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delete db;
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throw;
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}
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return db;
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}
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Database::Database()
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: env(0)
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{
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}
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Database::~Database()
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{
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if (env) {
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env->close(0);
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delete env;
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}
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}
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void Database::open(const string & path)
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{
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try {
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openDB(filename, dbname, false);
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if (env) throw Error(format("environment already open"));
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env = new DbEnv(0);
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debug("foo" + path);
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env->open(path.c_str(),
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DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN |
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DB_CREATE,
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0666);
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} catch (DbException e) { rethrow(e); }
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}
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bool queryDB(const string & filename, const string & dbname,
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void Database::createTable(const string & table)
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{
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try {
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Db * db = openDB(noTxn, table, true);
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DestroyDb destroyDb(db);
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} catch (DbException e) { rethrow(e); }
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}
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bool Database::queryString(const Transaction & txn, const string & table,
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const string & key, string & data)
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{
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try {
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int err;
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auto_ptr<Db2> db = openDB(filename, dbname, true);
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Db * db = openDB(txn, table, false);
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DestroyDb destroyDb(db);
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Dbt kt((void *) key.c_str(), key.length());
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Dbt dt;
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err = db->get(0, &kt, &dt, 0);
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int err = db->get(txn.txn, &kt, &dt, 0);
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if (err) return false;
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if (!dt.get_data())
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@ -76,12 +152,12 @@ bool queryDB(const string & filename, const string & dbname,
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}
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bool queryListDB(const string & filename, const string & dbname,
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bool Database::queryStrings(const Transaction & txn, const string & table,
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const string & key, Strings & data)
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{
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string d;
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if (!queryDB(filename, dbname, key, d))
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if (!queryString(txn, table, key, d))
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return false;
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string::iterator it = d.begin();
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@ -110,19 +186,21 @@ bool queryListDB(const string & filename, const string & dbname,
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}
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void setDB(const string & filename, const string & dbname,
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void Database::setString(const Transaction & txn, const string & table,
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const string & key, const string & data)
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{
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try {
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auto_ptr<Db2> db = openDB(filename, dbname, false);
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Db * db = openDB(txn, table, false);
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DestroyDb destroyDb(db);
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Dbt kt((void *) key.c_str(), key.length());
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Dbt dt((void *) data.c_str(), data.length());
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db->put(0, &kt, &dt, 0);
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db->put(txn.txn, &kt, &dt, 0);
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} catch (DbException e) { rethrow(e); }
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}
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void setListDB(const string & filename, const string & dbname,
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void Database::setStrings(const Transaction & txn, const string & table,
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const string & key, const Strings & data)
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{
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string d;
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@ -141,34 +219,36 @@ void setListDB(const string & filename, const string & dbname,
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d += s;
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}
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setDB(filename, dbname, key, d);
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setString(txn, table, key, d);
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}
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void delDB(const string & filename, const string & dbname,
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void Database::delPair(const Transaction & txn, const string & table,
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const string & key)
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{
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try {
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auto_ptr<Db2> db = openDB(filename, dbname, false);
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Db * db = openDB(txn, table, false);
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DestroyDb destroyDb(db);
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Dbt kt((void *) key.c_str(), key.length());
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db->del(0, &kt, 0);
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db->del(txn.txn, &kt, 0);
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} catch (DbException e) { rethrow(e); }
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}
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void enumDB(const string & filename, const string & dbname,
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void Database::enumTable(const Transaction & txn, const string & table,
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Strings & keys)
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{
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try {
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auto_ptr<Db2> db = openDB(filename, dbname, true);
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Db * db = openDB(txn, table, false);
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DestroyDb destroyDb(db);
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Dbc * cursor;
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db->cursor(0, &cursor, 0);
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DbcClose cursorCloser(cursor);
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Dbc * dbc;
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db->cursor(0, &dbc, 0);
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DestroyDbc destroyDbc(dbc);
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Dbt kt, dt;
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while (cursor->get(&kt, &dt, DB_NEXT) != DB_NOTFOUND)
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while (dbc->get(&kt, &dt, DB_NEXT) != DB_NOTFOUND)
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keys.push_back(
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string((char *) kt.get_data(), kt.get_size()));
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71
src/db.hh
71
src/db.hh
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@ -4,28 +4,73 @@
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#include <string>
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#include <list>
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#include <db_cxx.h>
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#include "util.hh"
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using namespace std;
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void createDB(const string & filename, const string & dbname);
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bool queryDB(const string & filename, const string & dbname,
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const string & key, string & data);
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class Database;
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bool queryListDB(const string & filename, const string & dbname,
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const string & key, Strings & data);
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void setDB(const string & filename, const string & dbname,
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const string & key, const string & data);
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class Transaction
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{
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friend class Database;
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void setListDB(const string & filename, const string & dbname,
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const string & key, const Strings & data);
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private:
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DbTxn * txn;
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void delDB(const string & filename, const string & dbname,
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const string & key);
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public:
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Transaction();
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Transaction(Database & _db);
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~Transaction();
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void commit();
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};
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#define noTxn Transaction()
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class Database
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{
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friend class Transaction;
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private:
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DbEnv * env;
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void requireEnv();
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Db * openDB(const Transaction & txn,
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const string & table, bool create);
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public:
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Database();
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~Database();
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void open(const string & path);
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void createTable(const string & table);
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bool queryString(const Transaction & txn, const string & table,
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const string & key, string & data);
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bool queryStrings(const Transaction & txn, const string & table,
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const string & key, Strings & data);
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void setString(const Transaction & txn, const string & table,
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const string & key, const string & data);
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void setStrings(const Transaction & txn, const string & table,
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const string & key, const Strings & data);
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void delPair(const Transaction & txn, const string & table,
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const string & key);
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void enumTable(const Transaction & txn, const string & table,
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Strings & keys);
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};
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void enumDB(const string & filename, const string & dbname,
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Strings & keys);
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#endif /* !__DB_H */
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@ -301,6 +301,8 @@ static Expr evalFile(EvalState & state, string relPath)
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void run(Strings args)
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{
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openDB();
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EvalState state;
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Strings files;
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@ -2,6 +2,9 @@
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#include "db.hh"
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Database nixDB;
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string dbPath2Id = "path2id";
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string dbId2Paths = "id2paths";
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string dbSuccessors = "successors";
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@ -11,13 +14,19 @@ string dbSubstitutes = "substitutes";
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string nixStore = "/UNINIT";
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string nixDataDir = "/UNINIT";
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string nixLogDir = "/UNINIT";
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string nixDB = "/UNINIT";
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string nixDBPath = "/UNINIT";
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void openDB()
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{
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nixDB.open(nixDBPath);
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}
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void initDB()
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{
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createDB(nixDB, dbPath2Id);
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createDB(nixDB, dbId2Paths);
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createDB(nixDB, dbSuccessors);
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createDB(nixDB, dbSubstitutes);
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nixDB.createTable(dbPath2Id);
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nixDB.createTable(dbId2Paths);
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nixDB.createTable(dbSuccessors);
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nixDB.createTable(dbSubstitutes);
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}
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@ -3,10 +3,15 @@
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#include <string>
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#include "db.hh"
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using namespace std;
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/* Database names. */
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extern Database nixDB;
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/* Database tables. */
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/* dbPath2Id :: Path -> FSId
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@ -60,12 +65,14 @@ extern string nixDataDir; /* !!! fix */
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/* nixLogDir is the directory where we log various operations. */
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extern string nixLogDir;
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/* nixDB is the file name of the Berkeley DB database where we
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maintain the dbXXX mappings. */
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extern string nixDB;
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/* nixDBPath is the path name of our Berkeley DB environment. */
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extern string nixDBPath;
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/* Initialize the databases. */
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/* Open the database environment. */
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void openDB();
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/* Create the required database tables. */
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void initDB();
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@ -335,6 +335,8 @@ static void opVerify(Strings opFlags, Strings opArgs)
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list. */
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void run(Strings args)
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{
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openDB();
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Strings opFlags, opArgs;
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Operation op = 0;
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|
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@ -9,7 +9,7 @@
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void registerSuccessor(const FSId & id1, const FSId & id2)
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{
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setDB(nixDB, dbSuccessors, id1, id2);
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nixDB.setString(noTxn, dbSuccessors, id1, id2);
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}
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@ -31,7 +31,7 @@ FSId normaliseFState(FSId id, FSIdSet pending)
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/* Try to substitute $id$ by any known successors in order to
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speed up the rewrite process. */
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string idSucc;
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while (queryDB(nixDB, dbSuccessors, id, idSucc)) {
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while (nixDB.queryString(noTxn, dbSuccessors, id, idSucc)) {
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debug(format("successor %1% -> %2%") % (string) id % idSucc);
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id = parseHash(idSucc);
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}
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@ -191,7 +191,7 @@ void realiseSlice(const FSId & id, FSIdSet pending)
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{
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SliceElem elem = *i;
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string id;
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if (!queryDB(nixDB, dbPath2Id, elem.path, id)) {
|
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if (!nixDB.queryString(noTxn, dbPath2Id, elem.path, id)) {
|
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if (pathExists(elem.path))
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throw Error(format("path `%1%' obstructed") % elem.path);
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missing = true;
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|
@ -269,7 +269,7 @@ static void fstateRequisitesSet(const FSId & id,
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string idSucc;
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if (includeSuccessors &&
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queryDB(nixDB, dbSuccessors, id, idSucc))
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nixDB.queryString(noTxn, dbSuccessors, id, idSucc))
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fstateRequisitesSet(parseHash(idSucc),
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includeExprs, includeSuccessors, paths);
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}
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@ -293,13 +293,13 @@ FSIds findGenerators(const FSIds & _ids)
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mappings, since we know that those are Nix expressions. */
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Strings sucs;
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enumDB(nixDB, dbSuccessors, sucs);
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nixDB.enumTable(noTxn, dbSuccessors, sucs);
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for (Strings::iterator i = sucs.begin();
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i != sucs.end(); i++)
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{
|
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string s;
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if (!queryDB(nixDB, dbSuccessors, *i, s)) continue;
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if (!nixDB.queryString(noTxn, dbSuccessors, *i, s)) continue;
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FSId id = parseHash(s);
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FState fs;
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|
|
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|
@ -19,7 +19,7 @@ static void initAndRun(int argc, char * * argv)
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nixStore = NIX_STORE_DIR;
|
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nixDataDir = NIX_DATA_DIR;
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nixLogDir = NIX_LOG_DIR;
|
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nixDB = (string) NIX_STATE_DIR + "/nixstate.db";
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nixDBPath = (string) NIX_STATE_DIR + "/db";
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||||
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/* Put the arguments in a vector. */
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||||
Strings args;
|
||||
|
|
|
|||
57
src/store.cc
57
src/store.cc
|
|
@ -96,7 +96,7 @@ void registerSubstitute(const FSId & srcId, const FSId & subId)
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|||
/* For now, accept only one substitute per id. */
|
||||
Strings subs;
|
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subs.push_back(subId);
|
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setListDB(nixDB, dbSubstitutes, srcId, subs);
|
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nixDB.setStrings(noTxn, dbSubstitutes, srcId, subs);
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}
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|
||||
|
|
@ -104,10 +104,10 @@ void registerPath(const string & _path, const FSId & id)
|
|||
{
|
||||
string path(canonPath(_path));
|
||||
|
||||
setDB(nixDB, dbPath2Id, path, id);
|
||||
nixDB.setString(noTxn, dbPath2Id, path, id);
|
||||
|
||||
Strings paths;
|
||||
queryListDB(nixDB, dbId2Paths, id, paths); /* non-existence = ok */
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, id, paths); /* non-existence = ok */
|
||||
|
||||
for (Strings::iterator it = paths.begin();
|
||||
it != paths.end(); it++)
|
||||
|
|
@ -115,7 +115,7 @@ void registerPath(const string & _path, const FSId & id)
|
|||
|
||||
paths.push_back(path);
|
||||
|
||||
setListDB(nixDB, dbId2Paths, id, paths);
|
||||
nixDB.setStrings(noTxn, dbId2Paths, id, paths);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -124,16 +124,15 @@ void unregisterPath(const string & _path)
|
|||
string path(canonPath(_path));
|
||||
|
||||
string _id;
|
||||
if (!queryDB(nixDB, dbPath2Id, path, _id))
|
||||
return;
|
||||
if (!nixDB.queryString(noTxn, dbPath2Id, path, _id)) return;
|
||||
FSId id(parseHash(_id));
|
||||
|
||||
delDB(nixDB, dbPath2Id, path);
|
||||
nixDB.delPair(noTxn, dbPath2Id, path);
|
||||
|
||||
/* begin transaction */
|
||||
|
||||
Strings paths, paths2;
|
||||
queryListDB(nixDB, dbId2Paths, id, paths); /* non-existence = ok */
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, id, paths); /* non-existence = ok */
|
||||
|
||||
bool changed = false;
|
||||
for (Strings::iterator it = paths.begin();
|
||||
|
|
@ -141,7 +140,7 @@ void unregisterPath(const string & _path)
|
|||
if (*it != path) paths2.push_back(*it); else changed = true;
|
||||
|
||||
if (changed)
|
||||
setListDB(nixDB, dbId2Paths, id, paths2);
|
||||
nixDB.setStrings(noTxn, dbId2Paths, id, paths2);
|
||||
|
||||
/* end transaction */
|
||||
|
||||
|
|
@ -151,7 +150,7 @@ void unregisterPath(const string & _path)
|
|||
bool queryPathId(const string & path, FSId & id)
|
||||
{
|
||||
string s;
|
||||
if (!queryDB(nixDB, dbPath2Id, absPath(path), s)) return false;
|
||||
if (!nixDB.queryString(noTxn, dbPath2Id, absPath(path), s)) return false;
|
||||
id = parseHash(s);
|
||||
return true;
|
||||
}
|
||||
|
|
@ -174,7 +173,7 @@ string expandId(const FSId & id, const string & target,
|
|||
if (!target.empty() && !isInPrefix(target, prefix))
|
||||
abort();
|
||||
|
||||
queryListDB(nixDB, dbId2Paths, id, paths);
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, id, paths);
|
||||
|
||||
/* Pick one equal to `target'. */
|
||||
if (!target.empty()) {
|
||||
|
|
@ -212,7 +211,7 @@ string expandId(const FSId & id, const string & target,
|
|||
/* Try to realise the substitutes, but only if this id is not
|
||||
already being realised by a substitute. */
|
||||
Strings subs;
|
||||
queryListDB(nixDB, dbSubstitutes, id, subs); /* non-existence = ok */
|
||||
nixDB.queryStrings(noTxn, dbSubstitutes, id, subs); /* non-existence = ok */
|
||||
|
||||
for (Strings::iterator it = subs.begin(); it != subs.end(); it++) {
|
||||
FSId subId = parseHash(*it);
|
||||
|
|
@ -264,7 +263,7 @@ void deleteFromStore(const string & path)
|
|||
void verifyStore()
|
||||
{
|
||||
Strings paths;
|
||||
enumDB(nixDB, dbPath2Id, paths);
|
||||
nixDB.enumTable(noTxn, dbPath2Id, paths);
|
||||
|
||||
for (Strings::iterator i = paths.begin();
|
||||
i != paths.end(); i++)
|
||||
|
|
@ -278,10 +277,10 @@ void verifyStore()
|
|||
|
||||
else {
|
||||
string id;
|
||||
if (!queryDB(nixDB, dbPath2Id, path, id)) abort();
|
||||
if (!nixDB.queryString(noTxn, dbPath2Id, path, id)) abort();
|
||||
|
||||
Strings idPaths;
|
||||
queryListDB(nixDB, dbId2Paths, id, idPaths);
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, id, idPaths);
|
||||
|
||||
bool found = false;
|
||||
for (Strings::iterator j = idPaths.begin();
|
||||
|
|
@ -298,11 +297,11 @@ void verifyStore()
|
|||
debug(format("reverse mapping for path `%1%' missing") % path);
|
||||
}
|
||||
|
||||
if (erase) delDB(nixDB, dbPath2Id, path);
|
||||
if (erase) nixDB.delPair(noTxn, dbPath2Id, path);
|
||||
}
|
||||
|
||||
Strings ids;
|
||||
enumDB(nixDB, dbId2Paths, ids);
|
||||
nixDB.enumTable(noTxn, dbId2Paths, ids);
|
||||
|
||||
for (Strings::iterator i = ids.begin();
|
||||
i != ids.end(); i++)
|
||||
|
|
@ -310,13 +309,13 @@ void verifyStore()
|
|||
FSId id = parseHash(*i);
|
||||
|
||||
Strings idPaths;
|
||||
queryListDB(nixDB, dbId2Paths, id, idPaths);
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, id, idPaths);
|
||||
|
||||
for (Strings::iterator j = idPaths.begin();
|
||||
j != idPaths.end(); )
|
||||
{
|
||||
string id2;
|
||||
if (!queryDB(nixDB, dbPath2Id, *j, id2) ||
|
||||
if (!nixDB.queryString(noTxn, dbPath2Id, *j, id2) ||
|
||||
id != parseHash(id2)) {
|
||||
debug(format("erasing path `%1%' from mapping for id %2%")
|
||||
% *j % (string) id);
|
||||
|
|
@ -324,12 +323,12 @@ void verifyStore()
|
|||
} else j++;
|
||||
}
|
||||
|
||||
setListDB(nixDB, dbId2Paths, id, idPaths);
|
||||
nixDB.setStrings(noTxn, dbId2Paths, id, idPaths);
|
||||
}
|
||||
|
||||
|
||||
Strings subs;
|
||||
enumDB(nixDB, dbSubstitutes, subs);
|
||||
nixDB.enumTable(noTxn, dbSubstitutes, subs);
|
||||
|
||||
for (Strings::iterator i = subs.begin();
|
||||
i != subs.end(); i++)
|
||||
|
|
@ -337,7 +336,7 @@ void verifyStore()
|
|||
FSId srcId = parseHash(*i);
|
||||
|
||||
Strings subIds;
|
||||
queryListDB(nixDB, dbSubstitutes, srcId, subIds);
|
||||
nixDB.queryStrings(noTxn, dbSubstitutes, srcId, subIds);
|
||||
|
||||
for (Strings::iterator j = subIds.begin();
|
||||
j != subIds.end(); )
|
||||
|
|
@ -345,7 +344,7 @@ void verifyStore()
|
|||
FSId subId = parseHash(*j);
|
||||
|
||||
Strings subPaths;
|
||||
queryListDB(nixDB, dbId2Paths, subId, subPaths);
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, subId, subPaths);
|
||||
if (subPaths.size() == 0) {
|
||||
debug(format("erasing substitute %1% for %2%")
|
||||
% (string) subId % (string) srcId);
|
||||
|
|
@ -353,11 +352,11 @@ void verifyStore()
|
|||
} else j++;
|
||||
}
|
||||
|
||||
setListDB(nixDB, dbSubstitutes, srcId, subIds);
|
||||
nixDB.setStrings(noTxn, dbSubstitutes, srcId, subIds);
|
||||
}
|
||||
|
||||
Strings sucs;
|
||||
enumDB(nixDB, dbSuccessors, sucs);
|
||||
nixDB.enumTable(noTxn, dbSuccessors, sucs);
|
||||
|
||||
for (Strings::iterator i = sucs.begin();
|
||||
i != sucs.end(); i++)
|
||||
|
|
@ -365,17 +364,17 @@ void verifyStore()
|
|||
FSId id1 = parseHash(*i);
|
||||
|
||||
string id2;
|
||||
if (!queryDB(nixDB, dbSuccessors, id1, id2)) abort();
|
||||
if (!nixDB.queryString(noTxn, dbSuccessors, id1, id2)) abort();
|
||||
|
||||
Strings id2Paths;
|
||||
queryListDB(nixDB, dbId2Paths, id2, id2Paths);
|
||||
nixDB.queryStrings(noTxn, dbId2Paths, id2, id2Paths);
|
||||
if (id2Paths.size() == 0) {
|
||||
Strings id2Subs;
|
||||
queryListDB(nixDB, dbSubstitutes, id2, id2Subs);
|
||||
nixDB.queryStrings(noTxn, dbSubstitutes, id2, id2Subs);
|
||||
if (id2Subs.size() == 0) {
|
||||
debug(format("successor %1% for %2% missing")
|
||||
% id2 % (string) id1);
|
||||
delDB(nixDB, dbSuccessors, (string) id1);
|
||||
nixDB.delPair(noTxn, dbSuccessors, (string) id1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -51,6 +51,8 @@ struct MySource : RestoreSource
|
|||
|
||||
void runTests()
|
||||
{
|
||||
verbosity = (Verbosity) 100;
|
||||
|
||||
/* Hashing. */
|
||||
string s = "0b0ffd0538622bfe20b92c4aa57254d9";
|
||||
Hash h = parseHash(s);
|
||||
|
|
@ -94,14 +96,16 @@ void runTests()
|
|||
/* Set up the test environment. */
|
||||
|
||||
mkdir("scratch", 0777);
|
||||
mkdir("scratch/db", 0777);
|
||||
|
||||
string testDir = absPath("scratch");
|
||||
cout << testDir << endl;
|
||||
|
||||
nixStore = testDir;
|
||||
nixLogDir = testDir;
|
||||
nixDB = testDir + "/db";
|
||||
nixDBPath = testDir + "/db";
|
||||
|
||||
openDB();
|
||||
initDB();
|
||||
|
||||
/* Expression evaluation. */
|
||||
|
|
|
|||
|
|
@ -2,13 +2,13 @@
|
|||
|
||||
echo "builder started..."
|
||||
|
||||
for i in $(seq 1 30); do
|
||||
for i in $(seq 1 10); do
|
||||
echo $i
|
||||
sleep 1
|
||||
done
|
||||
|
||||
mkdir $out
|
||||
|
||||
echo "done" > $out/bla
|
||||
echo "done" >> $out/bla
|
||||
|
||||
echo "builder finished"
|
||||
|
|
|
|||
Loading…
Reference in a new issue