/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

/* Purpose of this test is to verify correct behavior of transactional file
 * operations.  File operations to be tested (and expected results) are:
 *  - open
 *  - create  (dictionary is created only if transaction is committed)
 *  - rename  (dictionary is renamed only if transaction is committed)
 *  - delete  (dictionary is deleted only if transaction is committed)
 *
 * The following subtests are here:
 *
 *  test_fileops_1:
 *    Verify that operations appear effective within a transaction,
 *    but are truly effective only if the transaction is committed.
 *
 *  test_fileops_2:
 *    Verify that attempting to open, remove or rename a dictionary that
 *    is marked for removal or renaming by another transaction in
 *    progress results in a DB_LOCK_NOTGRANTED error code.
 *
 *  test_fileops_3:
 *    Verify that the correct error codes are returned when attempting
 *    miscellaneous operations that should fail.
 *
 *
 * Future work (possible enhancements to this test, if desired):
 *  - verify correct behavior with "subdb" names (e.g. foo/bar)
 *  - beyond verifying that a dictionary exists, open it and read one entry, verify that the entry is correct
 *    (especially useful for renamed dictionary)
 *  - perform repeatedly in multiple threads
 *
 */


#include "test.h"
#include <db.h>

static DB_ENV *env;
static FILE *error_file = NULL;

static void
setup (void) {
    int r;
    toku_os_recursive_delete(TOKU_TEST_FILENAME);
    r=toku_os_mkdir(TOKU_TEST_FILENAME, S_IRWXU+S_IRWXG+S_IRWXO);       CKERR(r);

    if (verbose==0) {
        char errfname[TOKU_PATH_MAX+1];
	error_file = fopen(toku_path_join(errfname, 2, TOKU_TEST_FILENAME, "stderr"), "w");                             assert(error_file);
    }
    else error_file = stderr;

    r=db_env_create(&env, 0); CKERR(r);
    env->set_errfile(env, error_file ? error_file : stderr);
    r=env->open(env, TOKU_TEST_FILENAME, DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_CREATE|DB_PRIVATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
}



static void
test_shutdown(void) {
    int r;
    r=env->close(env, 0); CKERR(r);
    if (verbose==0) {
        fclose(error_file);
        error_file = NULL;
    }
}


// create dictionaries a.db, b.db, c.db
static void
create_abcd(void) {
    int r;
    DB_TXN * txn;
    DB * db_a;
    DB * db_b;
    DB * db_c;
    DB * db_d;
    
    r=env->txn_begin(env, 0, &txn, 0); CKERR(r);
    r=db_create(&db_a, env, 0); CKERR(r);
    r=db_create(&db_b, env, 0); CKERR(r);
    r=db_create(&db_c, env, 0); CKERR(r);
    r=db_create(&db_d, env, 0); CKERR(r);
    
    r=db_a->open(db_a, txn, "a.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_b->open(db_b, txn, "b.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_c->open(db_c, txn, "c.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_d->open(db_d, txn, "d.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    
    r=db_a->close(db_a, 0); CKERR(r);
    r=db_b->close(db_b, 0); CKERR(r);
    r=db_c->close(db_c, 0); CKERR(r);
    
    r=txn->commit(txn, 0); CKERR(r);

    r=db_d->close(db_d, 0); CKERR(r); //Should work whether close is before or after commit.  Do one after.
}



//   delete b
//   rename c to c2
//   create x
static void
perform_ops(DB_TXN * txn) {
    int r;
    DB * db_x;

    r = env->dbremove(env, txn, "b.db", NULL, 0);  CKERR(r);

    r = env->dbrename(env, txn, "c.db", NULL, "c2.db", 0); CKERR(r);

    r=db_create(&db_x, env, 0); CKERR(r);
    r=db_x->open(db_x, txn, "x.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_x->close(db_x, 0); CKERR(r);  // abort requires db be closed first
}


// verify that:
//   dictionaries a.db, b.db, c.db, d.db exist
//   dictionaries x.db and c2.db do not exist
static void
verify_abcd(void) {
    int r;
    DB_TXN * txn;
    DB * db_a;
    DB * db_b;
    DB * db_c;
    DB * db_d;
    DB * db_x;
    DB * db_c2;
    
    r=env->txn_begin(env, NULL, &txn, 0); CKERR(r);
    r=db_create(&db_a, env, 0); CKERR(r);
    r=db_create(&db_b, env, 0); CKERR(r);
    r=db_create(&db_c, env, 0); CKERR(r);
    r=db_create(&db_d, env, 0); CKERR(r);
    r=db_create(&db_x, env, 0); CKERR(r);
    r=db_create(&db_c2, env, 0); CKERR(r);
    
    // should exist:
    r=db_a->open(db_a, txn, "a.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_b->open(db_b, txn, "b.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_c->open(db_c, txn, "c.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_d->open(db_d, txn, "d.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);

    // should not exist:
    r=db_x->open(db_x, txn, "x.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR2(r, ENOENT);
    r=db_c2->open(db_c2, txn, "c2.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR2(r, ENOENT);

    r=db_a->close(db_a, 0); CKERR(r);
    r=db_b->close(db_b, 0); CKERR(r);
    r=db_c->close(db_c, 0); CKERR(r);
    r=db_d->close(db_d, 0); CKERR(r);
    r=db_x->close(db_x, 0); CKERR(r);
    r=db_c2->close(db_c2, 0); CKERR(r);
    
    r=txn->commit(txn, 0); CKERR(r);
}


// verify that:
//   dictionary a.db exists
//   dictionaries b.db, c.db do not exist
//   dictionary c2.db exists
//   dictionary d.db exists
//   dictionary x.db exists
static void
verify_ac2dx(DB_TXN * parent_txn) {
    int r;
    DB_TXN * txn;
    DB * db_a;
    DB * db_b;
    DB * db_c;
    DB * db_d;
    DB * db_x;
    DB * db_c2;
    
    r=env->txn_begin(env, parent_txn, &txn, 0); CKERR(r);
    r=db_create(&db_a, env, 0);  CKERR(r);
    r=db_create(&db_b, env, 0);  CKERR(r);
    r=db_create(&db_c, env, 0);  CKERR(r);
    r=db_create(&db_d, env, 0);  CKERR(r);
    r=db_create(&db_x, env, 0);  CKERR(r);
    r=db_create(&db_c2, env, 0); CKERR(r);
    
    // should exist:
    r=db_a->open(db_a, txn, "a.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO);    CKERR(r);
    r=db_c2->open(db_c2, txn, "c2.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
    r=db_d->open(db_d, txn, "d.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO);    CKERR(r);
    r=db_x->open(db_x, txn, "x.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO);    CKERR(r);

    // should not exist:
    r=db_b->open(db_b, txn, "b.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO);    CKERR2(r, ENOENT);
    r=db_c->open(db_c, txn, "c.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO);    CKERR2(r, ENOENT);

    r=db_a->close(db_a, 0);   CKERR(r);
    r=db_b->close(db_b, 0);   CKERR(r);
    r=db_c->close(db_c, 0);   CKERR(r);
    r=db_d->close(db_d, 0);   CKERR(r);
    r=db_x->close(db_x, 0);   CKERR(r);
    r=db_c2->close(db_c2, 0); CKERR(r);
    
    r=txn->commit(txn, 0); CKERR(r);
}


static void
test_fileops_1(void) {
    int r;
    DB_TXN *txn;

    create_abcd();
    verify_abcd();

    r=env->txn_begin(env, 0, &txn, 0); CKERR(r);
    perform_ops(txn);
    verify_ac2dx(txn);  // verify that operations appear effective within this txn
    r=txn->abort(txn); CKERR(r);

    // verify that aborted transaction changed nothing
    verify_abcd(); 

    r=env->txn_begin(env, 0, &txn, 0); CKERR(r);
    perform_ops(txn);
    verify_ac2dx(txn);  // verify that operations appear effective within this txn
    r=txn->commit(txn, 0); CKERR(r);

    // verify that committed transaction actually changed db
    verify_ac2dx(NULL);
}



static void
verify_locked_open(const char * name) {
    int r;
    DB_TXN * txn;
    DB * db;

    r=env->txn_begin(env, 0, &txn, 0); CKERR(r);
    r=db_create(&db, env, 0); CKERR(r);
    r=db->open(db, txn, name, 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); 
    CKERR2(r, DB_LOCK_NOTGRANTED);
    r=db->close(db, 0); CKERR(r);  // always safe to close
    r=txn->abort(txn); CKERR(r);
}

static void
verify_locked_remove(const char * name) {
    int r;
    DB_TXN * txn;

    r=env->txn_begin(env, 0, &txn, 0); CKERR(r);
    r = env->dbremove(env, txn, name, NULL, 0);
    CKERR2(r, DB_LOCK_NOTGRANTED);
    r=txn->abort(txn); CKERR(r);
}

static void
verify_locked_rename(const char * oldname, const char * newname) {
    int r;
    DB_TXN * txn;

    r=env->txn_begin(env, 0, &txn, 0); CKERR(r);
    r = env->dbrename(env, txn, oldname, NULL, newname, 0); 
    CKERR2(r, DB_LOCK_NOTGRANTED);
    r=txn->abort(txn); CKERR(r);
}


// Purpose of test_fileops_2() is to verify correct operation of 
// directory range locks.  It should not be possible to open or
// rename or remove a dictionary that is marked for removal or
// rename by another open transaction.
static void
test_fileops_2(void) {
    int r;
    DB_TXN * txn_a;

    verify_ac2dx(NULL);  // should still exist

    // begin txn_a
    //  remove a
    //  create e
    //  rename x->x2
    //  rename c2->c3
    //  open x2, c3, should succeed
    //  close x2, c3
    {
	DB * db_e;
	DB * db_c3;
	DB * db_x2;

 	r=env->txn_begin(env, 0, &txn_a, 0); CKERR(r);
	r=db_create(&db_e, env, 0); CKERR(r);
	r=db_create(&db_x2, env, 0); CKERR(r);
	r=db_create(&db_c3, env, 0); CKERR(r);

	r = env->dbremove(env, txn_a, "a.db", NULL, 0);  CKERR(r);
	r=db_e->open(db_e, txn_a, "e.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
	r = env->dbrename(env, txn_a, "x.db", NULL, "x2.db", 0); CKERR(r);
	r = env->dbrename(env, txn_a, "c2.db", NULL, "c3.db", 0); CKERR(r);

	r=db_x2->open(db_x2, txn_a, "x2.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
	r=db_c3->open(db_c3, txn_a, "c3.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);

	r=db_e->close(db_e, 0);   CKERR(r);  // abort requires db be closed first
	r=db_x2->close(db_x2, 0); CKERR(r);  // abort requires db be closed first
	r=db_c3->close(db_c3, 0); CKERR(r);  // abort requires db be closed first
	
    }

    // within another transaction:
    //   open a, should fail   DB_LOCK_NOTGRANTED
    //   open e, should fail   DB_LOCK_NOTGRANTED
    //   open x, should fail   DB_LOCK_NOTGRANTED
    //   open x2, should fail  DB_LOCK_NOTGRANTED
    //   open c2, should fail  DB_LOCK_NOTGRANTED
    //   open c3, should fail  DB_LOCK_NOTGRANTED
    //   remove a, e, x, x2, c2, c3  DB_LOCK_NOTGRANTED
    //   rename a, e, x, x2, c2, c3  DB_LOCK_NOTGRANTED

    verify_locked_open("a.db");
    verify_locked_open("e.db");
    verify_locked_open("x.db");
    verify_locked_open("x2.db");
    verify_locked_open("c2.db");
    verify_locked_open("c3.db");

    verify_locked_remove("a.db");
    verify_locked_remove("e.db");
    verify_locked_remove("x.db");
    verify_locked_remove("x2.db");
    verify_locked_remove("c2.db");
    verify_locked_remove("c3.db");

    verify_locked_rename("a.db", "z.db");
    verify_locked_rename("e.db", "z.db");
    verify_locked_rename("x.db", "z.db");
    verify_locked_rename("x2.db", "z.db");
    verify_locked_rename("c2.db", "z.db");
    verify_locked_rename("c3.db", "z.db");

    verify_locked_rename("d.db", "a.db");
    verify_locked_rename("d.db", "e.db");
    verify_locked_rename("d.db", "x.db");
    verify_locked_rename("d.db", "x2.db");
    verify_locked_rename("d.db", "c2.db");
    verify_locked_rename("d.db", "c3.db");


    r=txn_a->abort(txn_a); CKERR(r);
    
}


static void
test_fileops_3(void) {
    // verify cannot remove an open db

    int r;
    DB_TXN * txn_a;
    DB_TXN * txn_b;
    DB * db_d;

    r=env->txn_begin(env, 0, &txn_a, 0); CKERR(r);
    r=db_create(&db_d, env, 0); CKERR(r);
    r=db_d->open(db_d, txn_a, "d.db", 0, DB_BTREE, 0, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);

    // Verify correct error return codes when trying to
    // remove or rename an open dictionary
    r=env->txn_begin(env, 0, &txn_b, 0); CKERR(r);
    r = env->dbremove(env, txn_b, "d.db", NULL, 0);  
    CKERR2(r, EINVAL);
    r = env->dbrename(env, txn_b, "d.db", NULL, "z.db", 0);  
    CKERR2(r, EINVAL);
    r = env->dbrename(env, txn_b, "a.db", NULL, "d.db", 0);  
    CKERR2(r, EINVAL);
    r=db_d->close(db_d, 0); CKERR(r);
    r=txn_b->abort(txn_b); CKERR(r);


    // verify correct error return codes when trying to 
    // remove or rename a non-existent dictionary
    r = env->dbremove(env, txn_a, "nonexistent.db", NULL, 0);  
    CKERR2(r, ENOENT);
    r = env->dbrename(env, txn_a, "nonexistent.db", NULL, "z.db", 0);  
    CKERR2(r, ENOENT);

    // verify correct error return code when trying to
    // rename a dictionary to a name that already exists
    r = env->dbrename(env, txn_a, "a.db", NULL, "d.db", 0);  
    CKERR2(r, EEXIST);
    
    r=txn_a->abort(txn_a); CKERR(r);
}


int
test_main (int argc, char *const argv[]) {
    parse_args(argc, argv);
    setup();
    if (verbose >= 2) {
	printf("Immediately after setup:\n");
	print_engine_status(env);
    }
    test_fileops_1();
    if (verbose >= 2) {
	printf("After test_1:\n");
	print_engine_status(env);
    }
    test_fileops_2();
    test_fileops_3();
    if (verbose >= 2) {
	printf("After test_2 and test_3:\n");
	print_engine_status(env);
    }
    test_shutdown();
    return 0;
}