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# 2014 December 04
#
# 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.
#
#***********************************************************************
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/wal_common.tcl
set testprefix e_walhook
# EVIDENCE-OF: R-00752-43975 The sqlite3_wal_hook() function is used to
# register a callback that is invoked each time data is committed to a
# database in wal mode.
#
# 1.1: shows that the wal-hook is not invoked in rollback mode.
# 1.2: but is invoked in wal mode.
#
set ::wal_hook_count 0
proc my_wal_hook {args} {
incr ::wal_hook_count
return 0
}
do_test 1.1.1 {
db wal_hook my_wal_hook
execsql {
CREATE TABLE t1(x);
INSERT INTO t1 VALUES(1);
}
set ::wal_hook_count
} 0
do_test 1.1.2 {
execsql { PRAGMA journal_mode = wal }
set ::wal_hook_count
} 0
do_test 1.3 {
execsql { INSERT INTO t1 VALUES(2) }
set wal_hook_count
} 1
do_test 1.4 {
execsql {
BEGIN;
INSERT INTO t1 VALUES(3);
INSERT INTO t1 VALUES(4);
COMMIT;
}
set wal_hook_count
} 2
# EVIDENCE-OF: R-65366-15139 The callback is invoked by SQLite after the
# commit has taken place and the associated write-lock on the database
# released
#
set ::read_ok 0
proc my_wal_hook {args} {
sqlite3 db2 test.db
if {[db2 eval { SELECT * FROM t1 }] == "1 2 3 4 5"} {
set ::read_ok 1
}
db2 close
}
do_test 2.1 {
execsql { INSERT INTO t1 VALUES(5) }
set ::read_ok
} 1
# EVIDENCE-OF: R-44294-52863 The third parameter is the name of the
# database that was written to - either "main" or the name of an
# ATTACH-ed database.
#
# EVIDENCE-OF: R-18913-19355 The fourth parameter is the number of pages
# currently in the write-ahead log file, including those that were just
# committed.
#
set ::wal_hook_args [list]
proc my_wal_hook {dbname nEntry} {
set ::wal_hook_args [list $dbname $nEntry]
}
forcedelete test.db2
do_test 3.0 {
execsql {
ATTACH 'test.db2' AS aux;
CREATE TABLE aux.t2(x);
PRAGMA aux.journal_mode = wal;
}
} {wal}
# Database "aux"
do_test 3.1.1 {
set wal_hook_args [list]
execsql { INSERT INTO t2 VALUES('a') }
} {}
do_test 3.1.2 {
set wal_hook_args
} [list aux [wal_frame_count test.db2-wal 1024]]
# Database "main"
do_test 3.2.1 {
set wal_hook_args [list]
execsql { INSERT INTO t1 VALUES(6) }
} {}
do_test 3.1.2 {
set wal_hook_args
} [list main [wal_frame_count test.db-wal 1024]]
# EVIDENCE-OF: R-14034-00929 If an error code is returned, that error
# will propagate back up through the SQLite code base to cause the
# statement that provoked the callback to report an error, though the
# commit will have still occurred.
#
proc my_wal_hook {args} { return 1 ;# SQLITE_ERROR }
do_catchsql_test 4.1 {
INSERT INTO t1 VALUES(7)
} {1 {SQL logic error}}
proc my_wal_hook {args} { return 5 ;# SQLITE_BUSY }
do_catchsql_test 4.2 {
INSERT INTO t1 VALUES(8)
} {1 {database is locked}}
proc my_wal_hook {args} { return 14 ;# SQLITE_CANTOPEN }
do_catchsql_test 4.3 {
INSERT INTO t1 VALUES(9)
} {1 {unable to open database file}}
do_execsql_test 4.4 {
SELECT * FROM t1
} {1 2 3 4 5 6 7 8 9}
# EVIDENCE-OF: R-10466-53920 Calling sqlite3_wal_hook() replaces any
# previously registered write-ahead log callback.
set ::old_wal_hook 0
proc my_old_wal_hook {args} {
incr ::old_wal_hook
return 0
}
db wal_hook my_old_wal_hook
do_test 5.1 {
execsql { INSERT INTO t1 VALUES(10) }
set ::old_wal_hook
} {1}
# Replace old_wal_hook. Observe that it is not invoked after it has
# been replaced.
proc my_new_wal_hook {args} { return 0 }
db wal_hook my_new_wal_hook
do_test 5.2 {
execsql { INSERT INTO t1 VALUES(11) }
set ::old_wal_hook
} {1}
# EVIDENCE-OF: R-57445-43425 Note that the sqlite3_wal_autocheckpoint()
# interface and the wal_autocheckpoint pragma both invoke
# sqlite3_wal_hook() and will overwrite any prior sqlite3_wal_hook()
# settings.
#
set ::old_wal_hook 0
proc my_old_wal_hook {args} { incr ::old_wal_hook ; return 0 }
db wal_hook my_old_wal_hook
do_test 6.1.1 {
execsql { INSERT INTO t1 VALUES(12) }
set ::old_wal_hook
} {1}
do_test 6.1.2 {
execsql { PRAGMA wal_autocheckpoint = 1000 }
execsql { INSERT INTO t1 VALUES(12) }
set ::old_wal_hook
} {1}
# EVIDENCE-OF: R-52629-38967 The first parameter passed to the callback
# function when it is invoked is a copy of the third parameter passed to
# sqlite3_wal_hook() when registering the callback.
#
# This is tricky to test using the tcl interface. However, the
# mechanism used to invoke the tcl script registered as a wal-hook
# depends on the context pointer being correctly passed through. And
# since multiple different wal-hook scripts have been successfully
# invoked by this test script, consider this tested.
#
# EVIDENCE-OF: R-23378-42536 The second is a copy of the database
# handle.
#
# There is an assert() in the C wal-hook used by tclsqlite.c to
# prove this. And that hook has been invoked multiple times when
# running this script. So consider this requirement tested as well.
#
finish_test
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