# 2001 October 12
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing for correct handling of I/O errors
# such as writes failing because the disk is full.
# 
# The tests in this file use special facilities that are only
# available in the SQLite test fixture.
#
# $Id: ioerr.test,v 1.1.1.1 2012/02/21 17:04:16 misho Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# If SQLITE_DEFAULT_AUTOVACUUM is set to true, then a simulated IO error
# on the 8th IO operation in the SQL script below doesn't report an error.
#
# This is because the 8th IO call attempts to read page 2 of the database
# file when the file on disk is only 1 page. The pager layer detects that
# this has happened and suppresses the error returned by the OS layer.
#
do_ioerr_test ioerr-1 -erc 1 -ckrefcount 1 -sqlprep {
  SELECT * FROM sqlite_master;
} -sqlbody {
  CREATE TABLE t1(a,b,c);
  SELECT * FROM sqlite_master;
  BEGIN TRANSACTION;
  INSERT INTO t1 VALUES(1,2,3);
  INSERT INTO t1 VALUES(4,5,6);
  ROLLBACK;
  SELECT * FROM t1;
  BEGIN TRANSACTION;
  INSERT INTO t1 VALUES(1,2,3);
  INSERT INTO t1 VALUES(4,5,6);
  COMMIT;
  SELECT * FROM t1;
  DELETE FROM t1 WHERE a<100;
} -exclude [expr [string match [execsql {pragma auto_vacuum}] 1] ? 4 : 0]

# Test for IO errors during a VACUUM. 
#
# The first IO call is excluded from the test. This call attempts to read
# the file-header of the temporary database used by VACUUM. Since the
# database doesn't exist at that point, the IO error is not detected.
# 
# Additionally, if auto-vacuum is enabled, the 12th IO error is not 
# detected. Same reason as the 8th in the test case above.
# 
ifcapable vacuum {
  do_ioerr_test ioerr-2 -cksum true -ckrefcount true -sqlprep { 
    BEGIN; 
    CREATE TABLE t1(a, b, c); 
    INSERT INTO t1 VALUES(1, randstr(50,50), randstr(50,50)); 
    INSERT INTO t1 SELECT a+2, b||'-'||rowid, c||'-'||rowid FROM t1; 
    INSERT INTO t1 SELECT a+4, b||'-'||rowid, c||'-'||rowid FROM t1;
    INSERT INTO t1 SELECT a+8, b||'-'||rowid, c||'-'||rowid FROM t1;
    INSERT INTO t1 SELECT a+16, b||'-'||rowid, c||'-'||rowid FROM t1;
    INSERT INTO t1 SELECT a+32, b||'-'||rowid, c||'-'||rowid FROM t1;
    INSERT INTO t1 SELECT a+64, b||'-'||rowid, c||'-'||rowid FROM t1;
    INSERT INTO t1 SELECT a+128, b||'-'||rowid, c||'-'||rowid FROM t1;
    INSERT INTO t1 VALUES(1, randstr(600,600), randstr(600,600));
    CREATE TABLE t2 AS SELECT * FROM t1;
    CREATE TABLE t3 AS SELECT * FROM t1;
    COMMIT;
    DROP TABLE t2;
  } -sqlbody {
    VACUUM;
  } -exclude [list \
      1 [expr [string match [execsql {pragma auto_vacuum}] 1]?9:-1]]
}

do_ioerr_test ioerr-3 -ckrefcount true -tclprep {
  execsql {
    PRAGMA cache_size = 10;
    BEGIN;
    CREATE TABLE abc(a);
    INSERT INTO abc VALUES(randstr(1500,1500)); -- Page 4 is overflow
  }
  for {set i 0} {$i<150} {incr i} {
    execsql {
      INSERT INTO abc VALUES(randstr(100,100)); 
    }
  }
  execsql COMMIT
} -sqlbody {
  CREATE TABLE abc2(a);
  BEGIN;
  DELETE FROM abc WHERE length(a)>100;
  UPDATE abc SET a = randstr(90,90);
  COMMIT;
  CREATE TABLE abc3(a);
} 

# Test IO errors that can occur retrieving a record header that flows over
# onto an overflow page.
do_ioerr_test ioerr-4 -ckrefcount true -tclprep {
  set sql "CREATE TABLE abc(a1"
  for {set i 2} {$i<1300} {incr i} {
    append sql ", a$i"
  }
  append sql ");"
  execsql $sql
  execsql {INSERT INTO abc (a1) VALUES(NULL)}
} -sqlbody {
 SELECT * FROM abc;
}


# Test IO errors that may occur during a multi-file commit.
#
# Tests 8 and 17 are excluded when auto-vacuum is enabled for the same 
# reason as in test cases ioerr-1.XXX
ifcapable attach {
  set ex ""
  if {[string match [execsql {pragma auto_vacuum}] 1]} {
    set ex [list 4 17]
  }
  do_ioerr_test ioerr-5 -restoreprng 0 -ckrefcount true -sqlprep {
    ATTACH 'test2.db' AS test2;
  } -sqlbody {
    BEGIN;
    CREATE TABLE t1(a,b,c);
    CREATE TABLE test2.t2(a,b,c);
    COMMIT;
  } -exclude $ex
}

# Test IO errors when replaying two hot journals from a 2-file 
# transaction. This test only runs on UNIX.
#
# It cannot be run under the "exclusive" permutation. In that case, the
# locks held by the connection in the local (this) process prevent a 
# second connection from attempting the multi-file transaction.
#
ifcapable crashtest&&attach {
  if {![catch {sqlite3 -has-codec} r] && !$r && [permutation]!="exclusive"} {
    do_ioerr_test ioerr-6 -ckrefcount true -tclprep {
      execsql {
        ATTACH 'test2.db' as aux;
        CREATE TABLE tx(a, b);
        CREATE TABLE aux.ty(a, b);
      }
      set rc [crashsql -delay 2 -file test2.db-journal {
        ATTACH 'test2.db' as aux;
        PRAGMA cache_size = 10;
        BEGIN;
        CREATE TABLE aux.t2(a, b, c);
        CREATE TABLE t1(a, b, c);
        COMMIT;
      }]
      if {$rc!="1 {child process exited abnormally}"} {
        error "Wrong error message: $rc"
      }
    } -sqlbody {
      SELECT * FROM sqlite_master;
      SELECT * FROM aux.sqlite_master;
    }
  }
} 

# Test handling of IO errors that occur while rolling back hot journal
# files.
#
# These tests can't be run on windows because the windows version of 
# SQLite holds a mandatory exclusive lock on journal files it has open.
#
if {$tcl_platform(platform)!="windows"} {
  do_ioerr_test ioerr-7 -tclprep {
    db close
    sqlite3 db2 test2.db
    db2 eval {
      PRAGMA synchronous = 0;
      CREATE TABLE t1(a, b);
      INSERT INTO t1 VALUES(1, 2);
      BEGIN;
      INSERT INTO t1 VALUES(3, 4);
    }
    forcecopy test2.db test.db
    forcecopy test2.db-journal test.db-journal
    db2 close
  } -tclbody {
    sqlite3 db test.db
    db eval {
      SELECT * FROM t1;
    }
  } -exclude 1
}

# For test coverage:  Cause an I/O failure while trying to read a
# short field (one that fits into a Mem buffer without mallocing
# for space).
#
do_ioerr_test ioerr-8 -ckrefcount true -tclprep {
  execsql {
    CREATE TABLE t1(a,b,c);
    INSERT INTO t1 VALUES(randstr(200,200), randstr(1000,1000), 2);
  }
  db close
  sqlite3 db test.db
} -sqlbody {
  SELECT c FROM t1;
}

# For test coverage: Cause an IO error whilst reading the master-journal
# name from a journal file.
if {$tcl_platform(platform)=="unix"} {
  do_ioerr_test ioerr-9 -ckrefcount true -tclprep {
    execsql {
      CREATE TABLE t1(a,b,c);
      INSERT INTO t1 VALUES(randstr(200,200), randstr(1000,1000), 2);
      BEGIN;
      INSERT INTO t1 VALUES(randstr(200,200), randstr(1000,1000), 2);
    }
    forcecopy test.db-journal test2.db-journal
    execsql {
      COMMIT;
    }
    forcecopy test2.db-journal test.db-journal
    set f [open test.db-journal a]
    fconfigure $f -encoding binary
    puts -nonewline $f "hello"
    puts -nonewline $f "\x00\x00\x00\x05\x01\x02\x03\x04"
    puts -nonewline $f "\xd9\xd5\x05\xf9\x20\xa1\x63\xd7"
    close $f
  } -sqlbody {
    SELECT a FROM t1;
  }
}

# For test coverage: Cause an IO error during statement playback (i.e. 
# a constraint).
do_ioerr_test ioerr-10 -ckrefcount true -tclprep {
  execsql {
    BEGIN;
    CREATE TABLE t1(a PRIMARY KEY, b);
  }
  for {set i 0} {$i < 500} {incr i} {
    execsql {INSERT INTO t1 VALUES(:i, 'hello world');}
  }
  execsql {
    COMMIT;
  }
} -tclbody {

  catch {execsql {
    BEGIN;
    INSERT INTO t1 VALUES('abc', 123);
    INSERT INTO t1 VALUES('def', 123);
    INSERT INTO t1 VALUES('ghi', 123);
    INSERT INTO t1 SELECT (a+500)%900, 'good string' FROM t1;
  }} msg

  if {$msg != "column a is not unique"} {
    error $msg
  }
}

# Assertion fault bug reported by alex dimitrov.
#
do_ioerr_test ioerr-11 -ckrefcount true -erc 1 -sqlprep {
   CREATE TABLE A(Id INTEGER, Name TEXT);
   INSERT INTO A(Id, Name) VALUES(1, 'Name');
} -sqlbody {
   UPDATE A SET Id = 2, Name = 'Name2' WHERE Id = 1;
}

# Test that an io error encountered in a sync() caused by a call to
# sqlite3_release_memory() is handled Ok. Only try this if 
# memory-management is enabled.
#
ifcapable memorymanage {
  do_ioerr_test memmanage-ioerr1 -ckrefcount true -sqlprep {
    BEGIN;
    CREATE TABLE t1(a, b, c);
    INSERT INTO t1 VALUES(randstr(50,50), randstr(100,100), randstr(10,10));
    INSERT INTO t1 SELECT randstr(50,50), randstr(9,9), randstr(90,90) FROM t1;
    INSERT INTO t1 SELECT randstr(50,50), randstr(9,9), randstr(90,90) FROM t1;
    INSERT INTO t1 SELECT randstr(50,50), randstr(9,9), randstr(90,90) FROM t1;
    INSERT INTO t1 SELECT randstr(50,50), randstr(9,9), randstr(90,90) FROM t1;
    INSERT INTO t1 SELECT randstr(50,50), randstr(9,9), randstr(90,90) FROM t1;
  } -tclbody {
    sqlite3_release_memory 
  } -sqlbody {
    COMMIT;
  }
}

ifcapable pager_pragmas&&autovacuum {
  do_ioerr_test ioerr-12 -ckrefcount true -erc 1 -sqlprep {
     PRAGMA page_size = 512;
     PRAGMA auto_vacuum = incremental;
     CREATE TABLE t1(x);
     INSERT INTO t1 VALUES( randomblob(1   * (512-4)) );
     INSERT INTO t1 VALUES( randomblob(110 * (512-4)) );
     INSERT INTO t1 VALUES( randomblob(2   * (512-4)) );
     INSERT INTO t1 VALUES( randomblob(110 * (512-4)) );
     INSERT INTO t1 VALUES( randomblob(3 * (512-4)) );
     DELETE FROM t1 WHERE rowid = 3;
     PRAGMA incremental_vacuum = 2;
     DELETE FROM t1 WHERE rowid = 1;
  } -sqlbody {
     PRAGMA incremental_vacuum = 1;
  }
}

# Usually, after a new page is allocated from the end of the file, it does
# not need to be written to the journal. The exception is when the new page
# shares its sector with an existing page that does need to be journalled.
# This test case provokes this condition to test for the sake of coverage
# that an IO error while journalling the coresident page is handled correctly.
#
sqlite3_simulate_device -char {} -sectorsize 2048
do_ioerr_test ioerr-12 -ckrefcount true -erc 1 -tclprep {
  db close
  sqlite3 db test.db -vfs devsym

  # Create a test database. Page 2 is the root page of table t1. The only
  # row inserted into t1 has an overflow page - page 3. Page 3 will be
  # coresident on the 2048 byte sector with the next page to be allocated.
  # 
  db eval { PRAGMA page_size = 1024 }
  db eval { CREATE TABLE t1(x) }
  db eval { INSERT INTO t1 VALUES(randomblob(1100)); }
} -tclbody {
  db eval { INSERT INTO t1 VALUES(randomblob(2000)); }
}
sqlite3_simulate_device -char {} -sectorsize 0
catch {db close}

do_ioerr_test ioerr-13 -ckrefcount true -erc 1 -sqlprep {
  PRAGMA auto_vacuum = incremental;
  CREATE TABLE t1(x);
  CREATE TABLE t2(x);
  INSERT INTO t2 VALUES(randomblob(1500));
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t1 VALUES(randomblob(20));
  INSERT INTO t1 SELECT x FROM t1;
  INSERT INTO t1 SELECT x FROM t1;
  INSERT INTO t1 SELECT x FROM t1;
  INSERT INTO t1 SELECT x FROM t1;
  INSERT INTO t1 SELECT x FROM t1;
  INSERT INTO t1 SELECT x FROM t1;             /* 64 entries in t1 */
  INSERT INTO t1 SELECT x FROM t1 LIMIT 14;    /* 78 entries in t1 */
  DELETE FROM t2 WHERE rowid = 3;
} -sqlbody {
  -- This statement uses the balance_quick() optimization. The new page
  -- is appended to the database file. But the overflow page used by
  -- the new record will be positioned near the start of the database
  -- file, in the gap left by the "DELETE FROM t2 WHERE rowid=3" statement
  -- above.
  --
  -- The point of this is that the statement wil need to update two pointer
  -- map pages. Which introduces another opportunity for an IO error.
  --
  INSERT INTO t1 VALUES(randomblob(2000));
}

do_ioerr_test ioerr-14 -ckrefcount true -erc 1 -sqlprep {
  PRAGMA auto_vacuum = incremental;
  CREATE TABLE t1(x);
  CREATE TABLE t2(x);
  INSERT INTO t2 VALUES(randomblob(1500));
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;
  INSERT INTO t2 SELECT randomblob(1500) FROM t2;

  -- This statement inserts a row into t1 with an overflow page at the
  -- end of the file. A long way from its parent (the root of t1).
  INSERT INTO t1 VALUES(randomblob(1500));
  DELETE FROM t2 WHERE rowid<10;
} -sqlbody {
  -- This transaction will cause the root-page of table t1 to divide
  -- (by calling balance_deeper()). When it does, the "parent" page of the
  -- overflow page inserted in the -sqlprep block above will change and
  -- the corresponding pointer map page be updated. This test case attempts
  -- to cause an IO error during the pointer map page update.
  --
  BEGIN;
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  INSERT INTO t1 VALUES(randomblob(100));
  COMMIT;
}

do_ioerr_test ioerr-15 -tclprep {
  db eval {
    BEGIN;
    PRAGMA cache_size = 10;
    CREATE TABLE t1(a);
    CREATE INDEX i1 ON t1(a);
    CREATE TABLE t2(a);
  }
  for {set ii 1} {$ii < 100} {incr ii} {
    set v [string range [string repeat [format %.3d $ii] 200] 0 220]
    db eval {INSERT INTO t1 VALUES($v)}
  }
  db eval {
    DELETE FROM t1 WHERE oid > 85;
    COMMIT;
  }
} -sqlbody {
  BEGIN;
  INSERT INTO t2 VALUES(randstr(22000,22000));
  DELETE FROM t1 WHERE oid = 83;
  COMMIT;
} 

# This test verifies that IO errors that occur within the obscure branch
# of code executed by tkt3762.test are correctly reported.
#
ifcapable vacuum&&autovacuum&&pragma {
  do_ioerr_test ioerr-16 -erc 1 -ckrefcount 1 -sqlprep {
    PRAGMA auto_vacuum=INCREMENTAL;
    PRAGMA page_size=1024;
    BEGIN;
    CREATE TABLE t1(x);
    INSERT INTO t1 VALUES(zeroblob(900));
    INSERT INTO t1 VALUES(zeroblob(900));
    INSERT INTO t1 SELECT x FROM t1;
    INSERT INTO t1 SELECT x FROM t1;
    INSERT INTO t1 SELECT x FROM t1;
    INSERT INTO t1 SELECT x FROM t1;
    INSERT INTO t1 SELECT x FROM t1;
    INSERT INTO t1 SELECT x FROM t1;
    INSERT INTO t1 SELECT x FROM t1;
    DELETE FROM t1 WHERE rowid>202;
    COMMIT;
    VACUUM;
    PRAGMA cache_size = 10;
    BEGIN;
    DELETE FROM t1 WHERE rowid IN (10,11,12) ;
  } -sqlbody {
    PRAGMA incremental_vacuum(10);
    COMMIT;
  }
}

finish_test