test/interrupt.test

# 2004 Feb 8
#
# 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 script is the sqlite_interrupt() API.
#
# $Id: interrupt.test,v 1.5 2004/10/30 20:23:10 drh Exp $


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

# Compute a checksum on the entire database.
#
proc cksum {{db db}} {
  set txt [$db eval {SELECT name, type, sql FROM sqlite_master}]\n
  foreach tbl [$db eval {SELECT name FROM sqlite_master WHERE type='table'}] {
    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
}

# This routine attempts to execute the sql in $sql.  It triggers an
# interrupt a progressively later and later points during the processing
# and checks to make sure SQLITE_INTERRUPT is returned.  Eventually,
# the routine completes successfully.
#
proc interrupt_test {testid sql result {initcnt 0}} {
  set orig_sum [cksum]
  set i $initcnt
  while 1 {
    incr i
    set ::sqlite_interrupt_count $i
    do_test $testid.$i.1 [format {
      set ::r [catchsql %s]
      set ::code [db errorcode]
      expr {$::code==0 || $::code==9}
    } [list $sql]] 1
    if {$::code==9} {
      do_test $testid.$i.2 {
        cksum
      } $orig_sum
    } else {
      do_test $testid.$i.99 {
        set ::r
      } [list 0 $result]
      break
    }
  }
  set ::sqlite_interrupt_count 0
}

do_test interrupt-1.1 {
  execsql {
    CREATE TABLE t1(a,b);
    SELECT name FROM sqlite_master;
  }
} {t1}
interrupt_test interrupt-1.2 {DROP TABLE t1} {}
do_test interrupt-1.3 {
  execsql {
    SELECT name FROM sqlite_master;
  }
} {}
integrity_check interrupt-1.4

do_test interrrupt-2.1 {
  execsql {
    BEGIN;
    CREATE TABLE t1(a,b);
    INSERT INTO t1 VALUES(1,randstr(300,400));
    INSERT INTO t1 SELECT a+1, randstr(300,400) FROM t1;
    INSERT INTO t1 SELECT a+2, a || '-' || b FROM t1;
    INSERT INTO t1 SELECT a+4, a || '-' || b FROM t1;
    INSERT INTO t1 SELECT a+8, a || '-' || b FROM t1;
    INSERT INTO t1 SELECT a+16, a || '-' || b FROM t1;
    INSERT INTO t1 SELECT a+32, a || '-' || b FROM t1;
    COMMIT;
    UPDATE t1 SET b=substr(b,-5,5);
    SELECT count(*) from t1;
  }
} 64
set origsize [file size test.db]
set cksum [db eval {SELECT md5sum(a || b) FROM t1}]
interrupt_test interrupt-2.2 {VACUUM} {} 100
do_test interrupt-2.3 {
  execsql {
    SELECT md5sum(a || b) FROM t1;
  }
} $cksum
ifcapable vacuum {
  do_test interrupt-2.4 {
    expr {$::origsize>[file size test.db]}
  } 1
}
integrity_check interrupt-2.5

# Ticket #594.  If an interrupt occurs in the middle of a transaction
# and that transaction is later rolled back, the internal schema tables do
# not reset.
#
for {set i 1} {$i<50} {incr i 5} {
  do_test interrupt-3.$i.1 {
    execsql {
      BEGIN;
      CREATE TEMP TABLE t2(x,y);
      SELECT name FROM sqlite_temp_master;
    }
  } {t2}
  do_test interrupt-3.$i.2 {
    set ::sqlite_interrupt_count $::i
    catchsql {
      INSERT INTO t2 SELECT * FROM t1;
    }
  } {1 interrupted}
  do_test interrupt-3.$i.3 {
    execsql {
      SELECT name FROM sqlite_temp_master;
    }
  } {t2}
  do_test interrupt-3.$i.4 {
    catchsql {
      ROLLBACK
    }
  } {0 {}}
  do_test interrupt-3.$i.5 {
    catchsql {SELECT name FROM sqlite_temp_master};
    execsql {
      SELECT name FROM sqlite_temp_master;
    }
  } {}
}

# There are reports of a memory leak if an interrupt occurs during
# the beginning of a complex query - before the first callback.  We
# will try to reproduce it here:
#
execsql {
  CREATE TABLE t2(a,b,c);
  INSERT INTO t2 SELECT round(a/10), randstr(50,80), randstr(50,60) FROM t1;
}
set sql {
  SELECT max(min(b,c)), min(max(b,c)), a FROM t2 GROUP BY a ORDER BY a;
}
set sqlite_interrupt_count 1000000
execsql $sql
set max_count [expr {1000000-$sqlite_interrupt_count}]
for {set i 1} {$i<$max_count-5} {incr i 1} {
  do_test interrupt-4.$i.1 {
    set ::sqlite_interrupt_count $::i
    catchsql $sql
  } {1 interrupted}
}

finish_test