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libsql/libsql-sqlite3/test/snapshot.test
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2023-10-16 13:58:16 +02:00

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# 2015 December 7
#
# 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 the sqlite3_snapshot_xxx() APIs.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !snapshot {finish_test; return}
set testprefix snapshot
# This test does not work with the inmemory_journal permutation. The reason
# is that each connection opened as part of this permutation executes
# "PRAGMA journal_mode=memory", which fails if the database is in wal mode
# and there are one or more existing connections.
if {[permutation]=="inmemory_journal"} {
finish_test
return
}
foreach {tn tcl} {
1 {
proc snapshot_get {DB DBNAME} {
uplevel [list sqlite3_snapshot_get $DB $DBNAME]
}
proc snapshot_open {DB DBNAME SNAPSHOT} {
uplevel [list sqlite3_snapshot_open $DB $DBNAME $SNAPSHOT]
}
proc snapshot_free {SNAPSHOT} {
uplevel [list sqlite3_snapshot_free $SNAPSHOT]
}
proc snapshot_cmp {SNAPSHOT1 SNAPSHOT2} {
uplevel [list sqlite3_snapshot_cmp $SNAPSHOT1 $SNAPSHOT2]
}
}
2 {
proc snapshot_get {DB DBNAME} {
uplevel [list sqlite3_snapshot_get_blob $DB $DBNAME]
}
proc snapshot_open {DB DBNAME SNAPSHOT} {
uplevel [list sqlite3_snapshot_open_blob $DB $DBNAME $SNAPSHOT]
}
proc snapshot_free {SNAPSHOT} {
}
proc snapshot_cmp {SNAPSHOT1 SNAPSHOT2} {
uplevel [list sqlite3_snapshot_cmp_blob $SNAPSHOT1 $SNAPSHOT2]
}
}
} {
reset_db
eval $tcl
#-------------------------------------------------------------------------
# Check some error conditions in snapshot_get(). It is an error if:
#
# 1) snapshot_get() is called on a non-WAL database, or
# 2) there is an open write transaction on the database.
# 3) the database handle is in auto-commit mode
#
do_execsql_test $tn.1.0 {
CREATE TABLE t1(a, b);
INSERT INTO t1 VALUES(1, 2);
INSERT INTO t1 VALUES(3, 4);
}
do_test $tn.1.1.1 {
execsql { BEGIN; SELECT * FROM t1; }
list [catch { snapshot_get db main } msg] $msg
} {1 SQLITE_ERROR}
do_execsql_test $tn.1.1.2 COMMIT
do_test $tn.1.2.1 {
execsql {
PRAGMA journal_mode = WAL;
BEGIN;
INSERT INTO t1 VALUES(5, 6);
INSERT INTO t1 VALUES(7, 8);
}
list [catch { snapshot_get db main } msg] $msg
} {1 SQLITE_ERROR}
do_execsql_test $tn.1.2.2 COMMIT
do_test $tn.1.3.1 {
list [catch { snapshot_get db main } msg] $msg
} {1 SQLITE_ERROR}
do_test $tn.1.3.2 {
db trans { set snap [snapshot_get db main] }
snapshot_free $snap
} {}
#-------------------------------------------------------------------------
# Check that a simple case works. Reuse the database created by the
# block of tests above.
#
do_execsql_test $tn.2.1.0 {
BEGIN;
SELECT * FROM t1;
} {1 2 3 4 5 6 7 8}
do_test $tn.2.1.1 {
set snapshot [snapshot_get db main]
execsql {
COMMIT;
INSERT INTO t1 VALUES(9, 10);
SELECT * FROM t1;
}
} {1 2 3 4 5 6 7 8 9 10}
do_test $tn.2.1.2 {
execsql BEGIN
snapshot_open db main $snapshot
execsql {
SELECT * FROM t1;
}
} {1 2 3 4 5 6 7 8}
do_test $tn.2.1.3 {
snapshot_free $snapshot
execsql COMMIT
} {}
do_test $tn.2.2.0 {
sqlite3 db2 test.db
execsql {
BEGIN;
SELECT * FROM t1;
} db2
} {1 2 3 4 5 6 7 8 9 10}
do_test $tn.2.2.1 {
set snapshot [snapshot_get db2 main]
execsql {
INSERT INTO t1 VALUES(11, 12);
SELECT * FROM t1;
}
} {1 2 3 4 5 6 7 8 9 10 11 12}
do_test $tn.2.2.2 {
execsql BEGIN
snapshot_open db main $snapshot
execsql {
SELECT * FROM t1;
}
} {1 2 3 4 5 6 7 8 9 10}
do_test $tn.2.2.3 {
snapshot_free $snapshot
execsql COMMIT
execsql COMMIT db2
db2 close
} {}
do_test $tn.2.3.1 {
execsql { DELETE FROM t1 WHERE a>6 }
db trans { set snapshot [snapshot_get db main] }
execsql {
INSERT INTO t1 VALUES('a', 'b');
INSERT INTO t1 VALUES('c', 'd');
SELECT * FROM t1;
}
} {1 2 3 4 5 6 a b c d}
do_test $tn.2.3.2 {
execsql BEGIN
snapshot_open db main $snapshot
execsql { SELECT * FROM t1 }
} {1 2 3 4 5 6}
do_test $tn.2.3.3 {
catchsql {
INSERT INTO t1 VALUES('x','y')
}
} {1 {database is locked}}
do_test $tn.2.3.4 {
execsql COMMIT
snapshot_free $snapshot
} {}
#-------------------------------------------------------------------------
# Check some errors in snapshot_open(). It is an error if:
#
# 1) the db is in auto-commit mode,
# 2) the db has an open (read or write) transaction,
# 3) the db is not a wal database,
#
# Reuse the database created by earlier tests.
#
do_execsql_test $tn.3.0.0 {
CREATE TABLE t2(x, y);
INSERT INTO t2 VALUES('a', 'b');
INSERT INTO t2 VALUES('c', 'd');
BEGIN;
SELECT * FROM t2;
} {a b c d}
do_test $tn.3.0.1 {
set snapshot [snapshot_get db main]
execsql { COMMIT }
execsql { INSERT INTO t2 VALUES('e', 'f'); }
} {}
do_test $tn.3.1 {
list [catch {snapshot_open db main $snapshot } msg] $msg
} {1 SQLITE_ERROR}
do_test $tn.3.2.1 {
execsql {
BEGIN;
SELECT * FROM t2;
}
} {a b c d e f}
# Update - it is no longer an error to have a read-transaction open,
# provided there are no active SELECT statements.
do_test $tn.3.2.2a {
db eval "SELECT * FROM t2" {
set res [list [catch {snapshot_open db main $snapshot } msg] $msg]
break
}
set res
} {1 SQLITE_ERROR}
do_test $tn.3.2.2b {
snapshot_open db main $snapshot
} {}
do_test $tn.3.2.3 {
execsql {
COMMIT;
BEGIN;
INSERT INTO t2 VALUES('g', 'h');
}
list [catch {snapshot_open db main $snapshot } msg] $msg
} {1 SQLITE_ERROR}
do_execsql_test $tn.3.2.4 COMMIT
do_test $tn.3.3.1a {
execsql { PRAGMA journal_mode = DELETE }
execsql { BEGIN }
list [catch {snapshot_open db main $snapshot } msg] $msg
} {1 SQLITE_ERROR}
do_test $tn.3.3.1b {
execsql { COMMIT ; BEGIN ; SELECT * FROM t2 }
list [catch {snapshot_open db main $snapshot } msg] $msg
} {1 SQLITE_ERROR}
do_test $tn.$tn.3.3.2 {
snapshot_free $snapshot
execsql COMMIT
} {}
#-------------------------------------------------------------------------
# Check that SQLITE_ERROR_SNAPSHOT is returned if the specified snapshot
# no longer exists because the wal file has been checkpointed.
#
# 1. Reading a snapshot from the middle of a wal file is not possible
# after the wal file has been checkpointed.
#
# 2. That a snapshot from the end of a wal file can not be read once
# the wal file has been wrapped.
#
do_execsql_test $tn.4.1.0 {
PRAGMA journal_mode = wal;
CREATE TABLE t3(i, j);
INSERT INTO t3 VALUES('o', 't');
INSERT INTO t3 VALUES('t', 'f');
BEGIN;
SELECT * FROM t3;
} {wal o t t f}
do_test $tn.4.1.1 {
set snapshot [snapshot_get db main]
execsql COMMIT
} {}
do_test $tn.4.1.2 {
execsql {
INSERT INTO t3 VALUES('f', 's');
BEGIN;
}
snapshot_open db main $snapshot
execsql { SELECT * FROM t3 }
} {o t t f}
do_test $tn.4.1.3 {
execsql {
COMMIT;
PRAGMA wal_checkpoint;
BEGIN;
}
list [catch {snapshot_open db main $snapshot} msg] $msg
} {1 SQLITE_ERROR_SNAPSHOT}
do_test $tn.4.1.4 {
snapshot_free $snapshot
execsql COMMIT
} {}
do_test $tn.4.2.1 {
execsql {
INSERT INTO t3 VALUES('s', 'e');
INSERT INTO t3 VALUES('n', 't');
BEGIN;
SELECT * FROM t3;
}
} {o t t f f s s e n t}
do_test $tn.4.2.2 {
set snapshot [snapshot_get db main]
execsql {
COMMIT;
PRAGMA wal_checkpoint;
BEGIN;
}
snapshot_open db main $snapshot
execsql { SELECT * FROM t3 }
} {o t t f f s s e n t}
do_test $tn.4.2.3 {
execsql {
COMMIT;
INSERT INTO t3 VALUES('e', 't');
BEGIN;
}
list [catch {snapshot_open db main $snapshot} msg] $msg
} {1 SQLITE_ERROR_SNAPSHOT}
do_test $tn.4.2.4 {
snapshot_free $snapshot
} {}
#-------------------------------------------------------------------------
# Check that SQLITE_BUSY is returned if a checkpoint is running when
# sqlite3_snapshot_open() is called.
#
reset_db
db close
testvfs tvfs
sqlite3 db test.db -vfs tvfs
do_execsql_test $tn.5.1 {
PRAGMA journal_mode = wal;
CREATE TABLE x1(x, xx, xxx);
INSERT INTO x1 VALUES('z', 'zz', 'zzz');
BEGIN;
SELECT * FROM x1;
} {wal z zz zzz}
do_test $tn.5.2 {
set ::snapshot [snapshot_get db main]
sqlite3 db2 test.db -vfs tvfs
execsql {
INSERT INTO x1 VALUES('a', 'aa', 'aaa');
COMMIT;
}
} {}
set t53 0
proc write_callback {args} {
do_test $tn.5.3.[incr ::t53] {
execsql BEGIN
list [catch { snapshot_open db main $::snapshot } msg] $msg
} {1 SQLITE_BUSY}
catchsql COMMIT
}
tvfs filter xWrite
tvfs script write_callback
db2 eval { PRAGMA wal_checkpoint }
db close
db2 close
tvfs delete
snapshot_free $snapshot
#-------------------------------------------------------------------------
# Test that sqlite3_snapshot_get() may be called immediately after
# "BEGIN; PRAGMA user_version;". And that sqlite3_snapshot_open() may
# be called after opening the db handle and running the script
# "PRAGMA user_version; BEGIN".
reset_db
do_execsql_test $tn.6.1 {
PRAGMA journal_mode = wal;
CREATE TABLE x1(x, xx, xxx);
INSERT INTO x1 VALUES('z', 'zz', 'zzz');
BEGIN;
PRAGMA user_version;
} {wal 0}
do_test $tn.6.2 {
set ::snapshot [snapshot_get db main]
execsql {
INSERT INTO x1 VALUES('a', 'aa', 'aaa');
COMMIT;
}
} {}
do_test $tn.6.3 {
sqlite3 db2 test.db
db2 eval "PRAGMA user_version ; BEGIN"
snapshot_open db2 main $::snapshot
db2 eval { SELECT * FROM x1 }
} {z zz zzz}
do_test $tn.6.4 {
db2 close
sqlite3 db2 test.db
db2 eval "PRAGMA application_id"
db2 eval "BEGIN"
snapshot_open db2 main $::snapshot
db2 eval { SELECT * FROM x1 }
} {z zz zzz}
do_test $tn.6.5 {
db2 close
sqlite3 db2 test.db
db2 eval "BEGIN"
list [catch {snapshot_open db2 main $::snapshot} msg] $msg
} {1 SQLITE_ERROR}
snapshot_free $snapshot
#-------------------------------------------------------------------------
# The following tests investigate the sqlite3_snapshot_cmp() API.
#
# Compare snapshots $p1 and $p2, checking that the result is $r.
#
proc do_snapshot_cmp_test {tn p1 p2 r} {
uplevel [list do_test $tn.1 [list snapshot_cmp $p1 $p2] $r]
uplevel [list do_test $tn.2 [list snapshot_cmp $p2 $p1] [expr $r*-1]]
uplevel [list do_test $tn.3 [list snapshot_cmp $p1 $p1] 0]
uplevel [list do_test $tn.4 [list snapshot_cmp $p2 $p2] 0]
}
catch { db2 close }
reset_db
do_execsql_test $tn.7.1 {
PRAGMA journal_mode = wal;
CREATE TABLE t1(x);
} wal
do_test $tn.7.1.2 {
execsql { BEGIN ; PRAGMA application_id }
set p1 [snapshot_get db main]
execsql {
INSERT INTO t1 VALUES(10);
COMMIT;
}
execsql { BEGIN ; PRAGMA application_id }
set p2 [snapshot_get db main]
execsql COMMIT
} {}
do_snapshot_cmp_test $tn.7.1.3 $p1 $p2 -1
snapshot_free $p1
snapshot_free $p2
do_execsql_test $tn.7.2.1 {
INSERT INTO t1 VALUES(11);
INSERT INTO t1 VALUES(12);
INSERT INTO t1 VALUES(13);
BEGIN;
PRAGMA application_id;
} {0}
do_test $tn.7.2.2 {
set p1 [snapshot_get db main]
execsql {
COMMIT;
INSERT INTO t1 VALUES(14);
PRAGMA wal_checkpoint;
BEGIN;
PRAGMA application_id;
}
set p2 [snapshot_get db main]
execsql COMMIT
} {}
do_snapshot_cmp_test $tn.7.2.3 $p1 $p2 -1
snapshot_free $p2
do_test $tn.7.3.1 {
execsql {
INSERT INTO t1 VALUES(14);
BEGIN;
PRAGMA application_id;
}
set p2 [snapshot_get db main]
execsql COMMIT
} {}
do_snapshot_cmp_test $tn.7.3.2 $p1 $p2 -1
snapshot_free $p1
snapshot_free $p2
}
finish_test
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