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+# 2011 May 09
+#
+# 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 contains tests for using WAL databases in read-only mode.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+source $testdir/lock_common.tcl
+set ::testprefix walro
+
+# These tests are only going to work on unix.
+#
+if {$::tcl_platform(platform) != "unix"} {
+ finish_test
+ return
+}
+
+# And only if the build is WAL-capable.
+#
+ifcapable !wal {
+ finish_test
+ return
+}
+
+do_multiclient_test tn {
+
+ # Close all connections and delete the database.
+ #
+ code1 { db close }
+ code2 { db2 close }
+ code3 { db3 close }
+ forcedelete test.db
+ forcedelete walro
+
+ # Do not run tests with the connections in the same process.
+ #
+ if {$tn==2} continue
+
+ foreach c {code1 code2 code3} {
+ $c {
+ sqlite3_shutdown
+ sqlite3_config_uri 1
+ }
+ }
+
+ file mkdir walro
+
+ do_test 1.1.1 {
+ code2 { sqlite3 db2 test.db }
+ sql2 {
+ PRAGMA auto_vacuum = 0;
+ PRAGMA journal_mode = WAL;
+ CREATE TABLE t1(x, y);
+ INSERT INTO t1 VALUES('a', 'b');
+ }
+ file exists test.db-shm
+ } {1}
+
+ do_test 1.1.2 {
+ file attributes test.db-shm -permissions r--r--r--
+ code1 { sqlite3 db file:test.db?readonly_shm=1 }
+ } {}
+
+ do_test 1.1.3 { sql1 "SELECT * FROM t1" } {a b}
+ do_test 1.1.4 { sql2 "INSERT INTO t1 VALUES('c', 'd')" } {}
+ do_test 1.1.5 { sql1 "SELECT * FROM t1" } {a b c d}
+
+ # Check that the read-only connection cannot write or checkpoint the db.
+ #
+ do_test 1.1.6 {
+ csql1 "INSERT INTO t1 VALUES('e', 'f')"
+ } {1 {attempt to write a readonly database}}
+ do_test 1.1.7 {
+ csql1 "PRAGMA wal_checkpoint"
+ } {1 {attempt to write a readonly database}}
+
+ do_test 1.1.9 { sql2 "INSERT INTO t1 VALUES('e', 'f')" } {}
+ do_test 1.1.10 { sql1 "SELECT * FROM t1" } {a b c d e f}
+
+ do_test 1.1.11 {
+ sql2 {
+ INSERT INTO t1 VALUES('g', 'h');
+ PRAGMA wal_checkpoint;
+ }
+ set {} {}
+ } {}
+ do_test 1.1.12 { sql1 "SELECT * FROM t1" } {a b c d e f g h}
+ do_test 1.1.13 { sql2 "INSERT INTO t1 VALUES('i', 'j')" } {}
+
+ do_test 1.2.1 {
+ code2 { db2 close }
+ code1 { db close }
+ list [file exists test.db-wal] [file exists test.db-shm]
+ } {1 1}
+
+ do_test 1.2.2 {
+ code1 { sqlite3 db file:test.db?readonly_shm=1 }
+ list [catch { sql1 { SELECT * FROM t1 } } msg] $msg
+ } {0 {a b c d e f g h i j}}
+
+ do_test 1.2.3 {
+ code1 { db close }
+ file attributes test.db-shm -permissions rw-r--r--
+ hexio_write test.db-shm 0 01020304
+ file attributes test.db-shm -permissions r--r--r--
+ code1 { sqlite3 db file:test.db?readonly_shm=1 }
+ csql1 { SELECT * FROM t1 }
+ } {0 {a b c d e f g h i j}}
+ do_test 1.2.4 {
+ code1 { sqlite3_extended_errcode db }
+ } {SQLITE_OK}
+
+ do_test 1.2.5 {
+ file attributes test.db-shm -permissions rw-r--r--
+ code2 { sqlite3 db2 test.db }
+ sql2 "SELECT * FROM t1"
+ } {a b c d e f g h i j}
+ file attributes test.db-shm -permissions r--r--r--
+ do_test 1.2.6 { sql1 "SELECT * FROM t1" } {a b c d e f g h i j}
+
+ do_test 1.2.7 {
+ sql2 {
+ PRAGMA wal_checkpoint;
+ INSERT INTO t1 VALUES('k', 'l');
+ }
+ set {} {}
+ } {}
+ do_test 1.2.8 { sql1 "SELECT * FROM t1" } {a b c d e f g h i j k l}
+
+ # Now check that if the readonly_shm option is not supplied, or if it
+ # is set to zero, it is not possible to connect to the database without
+ # read-write access to the shm.
+ #
+ # UPDATE: os_unix.c now opens the *-shm file in readonly mode
+ # automatically.
+ #
+ do_test 1.3.1 {
+ code1 { db close }
+ code1 { sqlite3 db test.db }
+ csql1 { SELECT * FROM t1 }
+ } {0 {a b c d e f g h i j k l}}
+
+ # Also test that if the -shm file can be opened for read/write access,
+ # it is not if readonly_shm=1 is present in the URI.
+ do_test 1.3.2.1 {
+ code1 { db close }
+ code2 { db2 close }
+ file exists test.db-shm
+ } {0}
+ do_test 1.3.2.2 {
+ code1 { sqlite3 db file:test.db?readonly_shm=1 }
+ csql1 { SELECT * FROM sqlite_master }
+ } {1 {unable to open database file}}
+ do_test 1.3.2.3 {
+ code1 { db close }
+ close [open test.db-shm w]
+ file attributes test.db-shm -permissions r--r--r--
+ code1 { sqlite3 db file:test.db?readonly_shm=1 }
+ csql1 { SELECT * FROM t1 }
+ } {0 {a b c d e f g h i j k l}}
+ do_test 1.3.2.4 {
+ code1 { sqlite3_extended_errcode db }
+ } {SQLITE_OK}
+
+ #-----------------------------------------------------------------------
+ # Test cases 1.4.* check that checkpoints and log wraps don't prevent
+ # read-only connections from reading the database.
+ do_test 1.4.1 {
+ code1 { db close }
+ forcedelete test.db-shm
+ file exists test.db-shm
+ } {0}
+
+ # Open one read-only and one read-write connection. Write some data
+ # and then run a checkpoint using the read-write connection. Then
+ # check the read-only connection can still read.
+ do_test 1.4.2 {
+ code1 { sqlite3 db file:test.db?readonly_shm=1 }
+ code2 { sqlite3 db2 test.db }
+ csql2 {
+ INSERT INTO t1 VALUES(1, 2);
+ INSERT INTO t1 VALUES(3, 4);
+ INSERT INTO t1 VALUES(5, 6);
+ PRAGMA wal_checkpoint;
+ }
+ } {0 {0 3 3}}
+ do_test 1.4.3 {
+ csql1 { SELECT * FROM t1 }
+ } {0 {a b c d e f g h i j k l 1 2 3 4 5 6}}
+
+ # Using the read-write connection, open a transaction and write lots
+ # of data - causing a cache spill and a log wrap. Then check that the
+ # read-only connection can still read the database.
+ do_test 1.4.4.1 {
+ csql2 {
+ PRAGMA cache_size = 10;
+ BEGIN;
+ CREATE TABLE t2(x, y);
+ INSERT INTO t2 VALUES('abc', 'xyz');
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ }
+ file size test.db-wal
+ } [expr {[nonzero_reserved_bytes]?148848:147800}]
+ do_test 1.4.4.2 {
+ csql1 { SELECT * FROM t1 }
+ } {0 {a b c d e f g h i j k l 1 2 3 4 5 6}}
+ do_test 1.4.4.3 {
+ csql2 COMMIT
+ csql1 { SELECT count(*) FROM t2 }
+ } {0 512}
+ do_test 1.4.5 {
+ code2 { db2 close }
+ code1 { db close }
+ } {}
+}
+
+forcedelete test.db
+
+#-----------------------------------------------------------------------
+# Test cases 2.* check that a read-only connection may read the
+# database file while a checkpoint operation is ongoing.
+#
+do_multiclient_test tn {
+
+ # Close all connections and delete the database.
+ #
+ code1 { db close }
+ code2 { db2 close }
+ code3 { db3 close }
+ forcedelete test.db
+ forcedelete walro
+
+ # Do not run tests with the connections in the same process.
+ #
+ if {$tn==2} continue
+
+ foreach c {code1 code2 code3} {
+ $c {
+ sqlite3_shutdown
+ sqlite3_config_uri 1
+ }
+ }
+
+ proc tv_hook {x file args} {
+ if {[file tail $file]=="test.db-wal"} {
+ do_test 2.1.2 {
+ code2 { sqlite3 db2 file:test.db?readonly_shm=1 }
+ csql2 { SELECT count(*) FROM t2 }
+ } {0 4}
+ do_test 2.1.3 {
+ code2 { db2 close }
+ } {}
+ }
+ }
+
+ do_test 2.1.1 {
+ testvfs tv -default 1 -fullshm 1
+ tv script tv_hook
+ tv filter {}
+ code1 { sqlite3 db test.db }
+ csql1 {
+ PRAGMA auto_vacuum = 0;
+ PRAGMA journal_mode = WAL;
+ BEGIN;
+ CREATE TABLE t2(x, y);
+ INSERT INTO t2 VALUES('abc', 'xyz');
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ INSERT INTO t2 SELECT x||y, y||x FROM t2;
+ COMMIT;
+ }
+ } {0 wal}
+
+ tv filter xSync
+ set res [csql1 { PRAGMA wal_checkpoint }]
+ do_test 2.1.4 { set res } {0 {0 2 2}}
+
+ do_test 2.1.5 {
+ code1 { db close }
+ code1 { tv delete }
+ } {}
+}
+
+finish_test
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