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# 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 1.16 2005/01/19 03:47:16 danielk1977 Exp $

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

# Usage: do_ioerr_test <test number> <options...>
#
# The first argument, <test number>, is an integer used to name the
# tests executed by this proc. Options are as follows:
#
#     -tclprep          TCL script to run to prepare test.
#     -sqlprep          SQL script to run to prepare test.
#     -tclbody          TCL script to run with IO error simulation.
#     -sqlbody          TCL script to run with IO error simulation.
#     -exclude          List of 'N' values not to test.
#     -start            Value of 'N' to begin with (default 1)
#
proc do_ioerr_test {tn args} {
  array set ::ioerropts $args

  set ::go 1
  if {![info exists ::ioerropts(-start)]} {
    set ::ioerropts(-start) 1
  }
  for {set n $::ioerropts(-start)} {$::go} {incr n} {
 
    if {[info exists ::ioerropts(-exclude)]} {
      if {[lsearch $::ioerropts(-exclude) $n]!=-1} continue
    }

    do_test ioerr-$tn.$n.1 {
      set ::sqlite_io_error_pending 0
      catch {db close}
      catch {file delete -force test.db}
      catch {file delete -force test.db-journal}
      catch {file delete -force test2.db}
      catch {file delete -force test2.db-journal}
  
      set ::DB [sqlite3 db test.db]
  
      if {[info exists ::ioerropts(-tclprep)]} {
        eval $::ioerropts(-tclprep)
      }
      if {[info exists ::ioerropts(-sqlprep)]} {
        execsql $::ioerropts(-sqlprep)
      }
      expr 0
    } {0}
  
    do_test ioerr-$tn.$n.2 [subst {
      set ::sqlite_io_error_pending $n
    }] $n
  
    set ::ioerrorbody {}
    if {[info exists ::ioerropts(-tclbody)]} {
      append ::ioerrorbody "$::ioerropts(-tclbody)\n"
    }
    if {[info exists ::ioerropts(-sqlbody)]} {
      append ::ioerrorbody "db eval {$::ioerropts(-sqlbody)}"
    }
    do_test ioerr-$tn.$n.3 {
      set r [catch $::ioerrorbody msg]
      set ::go [expr {$::sqlite_io_error_pending<=0}]
      expr {$::sqlite_io_error_pending>0 || $r!=0}
    } {1}
  }
  set ::sqlite_io_error_pending 0
  unset ::ioerropts
}

# 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 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] ? 8 : 0]


proc cksum {{db db}} {
  set txt [$db eval {
      SELECT name, type, sql FROM sqlite_master order by name
  }]\n
  foreach tbl [$db eval {
      SELECT name FROM sqlite_master WHERE type='table' order by name
  }] {
    append txt [$db eval "SELECT * FROM $tbl"]\n
  }
  foreach prag {default_synchronous default_cache_size} {
    append txt $prag-[$db eval "PRAGMA $prag"]\n
  }
  set cksum [string length $txt]-[md5 $txt]
  # puts $cksum-[file size test.db]
  return $cksum
}

set ::go 1
for {set n 1} {$go} {incr n} {
  if {$n==24} breakpoint
  do_test ioerr-2.$n.1 {
    set ::sqlite_io_error_pending 0
    db close
    catch {file delete -force test.db}
    catch {file delete -force test.db-journal}
    catch {file delete -force test2.db}
    catch {file delete -force test2.db-journal}
    sqlite3 db test.db
    execsql {
      BEGIN;
      CREATE TABLE t1(a, b, c);
      INSERT INTO t1 VALUES(1, randstr(5,50), randstr(5,50));
      INSERT INTO t1 SELECT a+2, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 SELECT a+4, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 SELECT a+8, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 SELECT a+16, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 SELECT a+32, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 SELECT a+64, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 SELECT a+128, b||'-'||rowid, c||'-'||rowid FROM t1;
      INSERT INTO t1 VALUES(1, randstr(600,600), randstr(600,600));
      CREATE TABLE t2 AS SELECT * FROM t1;
      CREATE TABLE t3 AS SELECT * FROM t1;
      COMMIT;
      DROP TABLE t2;
    }
    set ::cksum [cksum]
    execsql {
      SELECT name FROM sqlite_master WHERE type='table'
    }
  } {t1 t3}
  do_test ioerr-2.$n.2 [subst {
    set ::sqlite_io_error_pending $n
  }] $n
  do_test ioerr-2.$n.3 {
    set r [catch {db eval {
      VACUUM;
    }} msg]
    set ::go [expr {$::sqlite_io_error_pending<=0}]
    expr {$::sqlite_io_error_pending>0 || $r!=0}
    set ::sqlite_io_error_pending 0
    db close
    sqlite3 db test.db
    cksum
  } $cksum
}
set ::sqlite_io_error_pending 0


do_ioerr_test 3 -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 4 -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
set ex ""
if {[string match [execsql {pragma auto_vacuum}] 1]} {
  set ex [list 8 17]
}
do_ioerr_test 5 -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.
if {$tcl_platform(platform)=="unix" && [file exists ./crashtest]} {
  do_ioerr_test 6 -tclprep {
    set rc [crashsql 2 test2.db-journal {
      ATTACH 'test2.db' as aux;
      PRAGMA cache_size = 10;
      BEGIN;
      CREATE TABLE aux.t2(a, b, c);
      CREATE TABLE t1(a, b, c);
      COMMIT;
    }]
    if {$rc!="1 {child process exited abnormally}"} {
      error "Wrong error message: $rc"
    }
  } -sqlbody {
    ATTACH 'test2.db' as aux;
    SELECT * FROM t1;
    SELECT * FROM t2;
  }
}

# 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 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);
    }
    file copy -force test2.db test.db
    file copy -force test2.db-journal test.db-journal
    db2 close
  } -tclbody {
    sqlite3 db test.db
    db eval {
      SELECT * FROM t1;
    }
  } -exclude 1
}

# do_ioerr_test 15 -sqlprep {
#   CREATE TABLE abc(a UNIQUE, b, c);
#   INSERT INTO abc VALUES(1, 2, 3);
# } -sqlbody {
#   BEGIN;
#   INSERT INTO abc VALUES(1, 2, 3);
#   COMMIT;
# }

finish_test