redis/tests/unit/multi.tcl

proc wait_for_dbsize {size} {
    set r2 [redis_client]
    wait_for_condition 50 100 {
        [$r2 dbsize] == $size
    } else {
        fail "Target dbsize not reached"
    }
    $r2 close
}

start_server {tags {"multi"}} {
    test {MULTI / EXEC basics} {
        r del mylist
        r rpush mylist a
        r rpush mylist b
        r rpush mylist c
        r multi
        set v1 [r lrange mylist 0 -1]
        set v2 [r ping]
        set v3 [r exec]
        list $v1 $v2 $v3
    } {QUEUED QUEUED {{a b c} PONG}}

    test {DISCARD} {
        r del mylist
        r rpush mylist a
        r rpush mylist b
        r rpush mylist c
        r multi
        set v1 [r del mylist]
        set v2 [r discard]
        set v3 [r lrange mylist 0 -1]
        list $v1 $v2 $v3
    } {QUEUED OK {a b c}}

    test {Nested MULTI are not allowed} {
        set err {}
        r multi
        catch {[r multi]} err
        r exec
        set _ $err
    } {*ERR MULTI*}

    test {MULTI where commands alter argc/argv} {
        r sadd myset a
        r multi
        r spop myset
        list [r exec] [r exists myset]
    } {a 0}

    test {WATCH inside MULTI is not allowed} {
        set err {}
        r multi
        catch {[r watch x]} err
        r exec
        set _ $err
    } {*ERR WATCH*}

    test {EXEC fails if there are errors while queueing commands #1} {
        r del foo1{t} foo2{t}
        r multi
        r set foo1{t} bar1
        catch {r non-existing-command}
        r set foo2{t} bar2
        catch {r exec} e
        assert_match {EXECABORT*} $e
        list [r exists foo1{t}] [r exists foo2{t}]
    } {0 0}

    test {EXEC fails if there are errors while queueing commands #2} {
        set rd [redis_deferring_client]
        r del foo1{t} foo2{t}
        r multi
        r set foo1{t} bar1
        $rd config set maxmemory 1
        assert  {[$rd read] eq {OK}}
        catch {r lpush mylist{t} myvalue}
        $rd config set maxmemory 0
        assert  {[$rd read] eq {OK}}
        r set foo2{t} bar2
        catch {r exec} e
        assert_match {EXECABORT*} $e
        $rd close
        list [r exists foo1{t}] [r exists foo2{t}]
    } {0 0} {needs:config-maxmemory}

    test {If EXEC aborts, the client MULTI state is cleared} {
        r del foo1{t} foo2{t}
        r multi
        r set foo1{t} bar1
        catch {r non-existing-command}
        r set foo2{t} bar2
        catch {r exec} e
        assert_match {EXECABORT*} $e
        r ping
    } {PONG}

    test {EXEC works on WATCHed key not modified} {
        r watch x{t} y{t} z{t}
        r watch k{t}
        r multi
        r ping
        r exec
    } {PONG}

    test {EXEC fail on WATCHed key modified (1 key of 1 watched)} {
        r set x 30
        r watch x
        r set x 40
        r multi
        r ping
        r exec
    } {}

    test {EXEC fail on WATCHed key modified (1 key of 5 watched)} {
        r set x{t} 30
        r watch a{t} b{t} x{t} k{t} z{t}
        r set x{t} 40
        r multi
        r ping
        r exec
    } {}

    test {EXEC fail on WATCHed key modified by SORT with STORE even if the result is empty} {
        r flushdb
        r lpush foo bar
        r watch foo
        r sort emptylist store foo
        r multi
        r ping
        r exec
    } {} {cluster:skip}

    test {EXEC fail on lazy expired WATCHed key} {
        r del key
        r debug set-active-expire 0

        for {set j 0} {$j < 10} {incr j} {
            r set key 1 px 100
            r watch key
            after 101
            r multi
            r incr key

            set res [r exec]
            if {$res eq {}} break
        }
        if {$::verbose} { puts "EXEC fail on lazy expired WATCHed key attempts: $j" }

        r debug set-active-expire 1
        set _ $res
    } {} {needs:debug}

    test {WATCH stale keys should not fail EXEC} {
        r del x
        r debug set-active-expire 0
        r set x foo px 1
        after 2
        r watch x
        r multi
        r ping
        assert_equal {PONG} [r exec]
        r debug set-active-expire 1
    } {OK} {needs:debug}

    test {Delete WATCHed stale keys should not fail EXEC} {
        r del x
        r debug set-active-expire 0
        r set x foo px 1
        after 2
        r watch x
        # EXISTS triggers lazy expiry/deletion
        assert_equal 0 [r exists x]
        r multi
        r ping
        assert_equal {PONG} [r exec]
        r debug set-active-expire 1
    } {OK} {needs:debug}

    test {FLUSHDB while watching stale keys should not fail EXEC} {
        r del x
        r debug set-active-expire 0
        r set x foo px 1
        after 2
        r watch x
        r flushdb
        r multi
        r ping
        assert_equal {PONG} [r exec]
        r debug set-active-expire 1
    } {OK} {needs:debug}

    test {After successful EXEC key is no longer watched} {
        r set x 30
        r watch x
        r multi
        r ping
        r exec
        r set x 40
        r multi
        r ping
        r exec
    } {PONG}

    test {After failed EXEC key is no longer watched} {
        r set x 30
        r watch x
        r set x 40
        r multi
        r ping
        r exec
        r set x 40
        r multi
        r ping
        r exec
    } {PONG}

    test {It is possible to UNWATCH} {
        r set x 30
        r watch x
        r set x 40
        r unwatch
        r multi
        r ping
        r exec
    } {PONG}

    test {UNWATCH when there is nothing watched works as expected} {
        r unwatch
    } {OK}

    test {FLUSHALL is able to touch the watched keys} {
        r set x 30
        r watch x
        r flushall
        r multi
        r ping
        r exec
    } {}

    test {FLUSHALL does not touch non affected keys} {
        r del x
        r watch x
        r flushall
        r multi
        r ping
        r exec
    } {PONG}

    test {FLUSHDB is able to touch the watched keys} {
        r set x 30
        r watch x
        r flushdb
        r multi
        r ping
        r exec
    } {}

    test {FLUSHDB does not touch non affected keys} {
        r del x
        r watch x
        r flushdb
        r multi
        r ping
        r exec
    } {PONG}

    test {SWAPDB is able to touch the watched keys that exist} {
        r flushall
        r select 0
        r set x 30
        r watch x ;# make sure x (set to 30) doesn't change (SWAPDB will "delete" it)
        r swapdb 0 1
        r multi
        r ping
        r exec
    } {} {singledb:skip}

    test {SWAPDB is able to touch the watched keys that do not exist} {
        r flushall
        r select 1
        r set x 30
        r select 0
        r watch x ;# make sure the key x (currently missing) doesn't change (SWAPDB will create it)
        r swapdb 0 1
        r multi
        r ping
        r exec
    } {} {singledb:skip}

    test {SWAPDB does not touch watched stale keys} {
        r flushall
        r select 1
        r debug set-active-expire 0
        r set x foo px 1
        after 2
        r watch x
        r swapdb 0 1 ; # expired key replaced with no key => no change
        r multi
        r ping
        assert_equal {PONG} [r exec]
        r debug set-active-expire 1
    } {OK} {singledb:skip needs:debug}

    test {SWAPDB does not touch non-existing key replaced with stale key} {
        r flushall
        r select 0
        r debug set-active-expire 0
        r set x foo px 1
        after 2
        r select 1
        r watch x
        r swapdb 0 1 ; # no key replaced with expired key => no change
        r multi
        r ping
        assert_equal {PONG} [r exec]
        r debug set-active-expire 1
    } {OK} {singledb:skip needs:debug}

    test {SWAPDB does not touch stale key replaced with another stale key} {
        r flushall
        r debug set-active-expire 0
        r select 1
        r set x foo px 1
        r select 0
        r set x bar px 1
        after 2
        r select 1
        r watch x
        r swapdb 0 1 ; # no key replaced with expired key => no change
        r multi
        r ping
        assert_equal {PONG} [r exec]
        r debug set-active-expire 1
    } {OK} {singledb:skip needs:debug}

    test {WATCH is able to remember the DB a key belongs to} {
        r select 5
        r set x 30
        r watch x
        r select 1
        r set x 10
        r select 5
        r multi
        r ping
        set res [r exec]
        # Restore original DB
        r select 9
        set res
    } {PONG} {singledb:skip}

    test {WATCH will consider touched keys target of EXPIRE} {
        r del x
        r set x foo
        r watch x
        r expire x 10
        r multi
        r ping
        r exec
    } {}

    test {WATCH will consider touched expired keys} {
        r flushall
        r del x
        r set x foo
        r expire x 1
        r watch x

        # Wait for the keys to expire.
        wait_for_dbsize 0

        r multi
        r ping
        r exec
    } {}

    test {DISCARD should clear the WATCH dirty flag on the client} {
        r watch x
        r set x 10
        r multi
        r discard
        r multi
        r incr x
        r exec
    } {11}

    test {DISCARD should UNWATCH all the keys} {
        r watch x
        r set x 10
        r multi
        r discard
        r set x 10
        r multi
        r incr x
        r exec
    } {11}

    test {MULTI / EXEC is not propagated (single write command)} {
        set repl [attach_to_replication_stream]
        r multi
        r set foo bar
        r exec
        r set foo2 bar
        assert_replication_stream $repl {
            {select *}
            {set foo bar}
            {set foo2 bar}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI / EXEC is propagated correctly (multiple commands)} {
        set repl [attach_to_replication_stream]
        r multi
        r set foo{t} bar
        r get foo{t}
        r set foo2{t} bar2
        r get foo2{t}
        r set foo3{t} bar3
        r get foo3{t}
        r exec

        assert_replication_stream $repl {
            {multi}
            {select *}
            {set foo{t} bar}
            {set foo2{t} bar2}
            {set foo3{t} bar3}
            {exec}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI / EXEC is propagated correctly (multiple commands with SELECT)} {
        set repl [attach_to_replication_stream]
        r multi
        r select 1
        r set foo{t} bar
        r get foo{t}
        r select 2
        r set foo2{t} bar2
        r get foo2{t}
        r select 3
        r set foo3{t} bar3
        r get foo3{t}
        r exec

        assert_replication_stream $repl {
            {multi}
            {select *}
            {set foo{t} bar}
            {select *}
            {set foo2{t} bar2}
            {select *}
            {set foo3{t} bar3}
            {exec}
        }
        close_replication_stream $repl
    } {} {needs:repl singledb:skip}

    test {MULTI / EXEC is propagated correctly (empty transaction)} {
        set repl [attach_to_replication_stream]
        r multi
        r exec
        r set foo bar
        assert_replication_stream $repl {
            {select *}
            {set foo bar}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI / EXEC is propagated correctly (read-only commands)} {
        r set foo value1
        set repl [attach_to_replication_stream]
        r multi
        r get foo
        r exec
        r set foo value2
        assert_replication_stream $repl {
            {select *}
            {set foo value2}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI / EXEC is propagated correctly (write command, no effect)} {
        r del bar
        r del foo
        set repl [attach_to_replication_stream]
        r multi
        r del foo
        r exec

        # add another command so that when we see it we know multi-exec wasn't
        # propagated
        r incr foo

        assert_replication_stream $repl {
            {select *}
            {incr foo}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI / EXEC with REPLICAOF} {
        # This test verifies that if we demote a master to replica inside a transaction, the
        # entire transaction is not propagated to the already-connected replica
        set repl [attach_to_replication_stream]
        r set foo bar
        r multi
        r set foo2 bar
        r replicaof localhost 9999
        r set foo3 bar
        r exec
        catch {r set foo4 bar} e
        assert_match {READONLY*} $e
        assert_replication_stream $repl {
            {select *}
            {set foo bar}
        }
        r replicaof no one
    } {OK} {needs:repl cluster:skip}

    test {DISCARD should not fail during OOM} {
        set rd [redis_deferring_client]
        $rd config set maxmemory 1
        assert  {[$rd read] eq {OK}}
        r multi
        catch {r set x 1} e
        assert_match {OOM*} $e
        r discard
        $rd config set maxmemory 0
        assert  {[$rd read] eq {OK}}
        $rd close
        r ping
    } {PONG} {needs:config-maxmemory}

    test {MULTI and script timeout} {
        # check that if MULTI arrives during timeout, it is either refused, or
        # allowed to pass, and we don't end up executing half of the transaction
        set rd1 [redis_deferring_client]
        set r2 [redis_client]
        r config set lua-time-limit 10
        r set xx 1
        $rd1 eval {while true do end} 0
        after 200
        catch { $r2 multi; } e
        catch { $r2 incr xx; } e
        r script kill
        after 200 ; # Give some time to Lua to call the hook again...
        catch { $r2 incr xx; } e
        catch { $r2 exec; } e
        assert_match {EXECABORT*previous errors*} $e
        set xx [r get xx]
        # make sure that either the whole transcation passed or none of it (we actually expect none)
        assert { $xx == 1 || $xx == 3}
        # check that the connection is no longer in multi state
        set pong [$r2 ping asdf]
        assert_equal $pong "asdf"
        $rd1 close; $r2 close
    }

    test {EXEC and script timeout} {
        # check that if EXEC arrives during timeout, we don't end up executing
        # half of the transaction, and also that we exit the multi state
        set rd1 [redis_deferring_client]
        set r2 [redis_client]
        r config set lua-time-limit 10
        r set xx 1
        catch { $r2 multi; } e
        catch { $r2 incr xx; } e
        $rd1 eval {while true do end} 0
        after 200
        catch { $r2 incr xx; } e
        catch { $r2 exec; } e
        assert_match {EXECABORT*BUSY*} $e
        r script kill
        after 200 ; # Give some time to Lua to call the hook again...
        set xx [r get xx]
        # make sure that either the whole transcation passed or none of it (we actually expect none)
        assert { $xx == 1 || $xx == 3}
        # check that the connection is no longer in multi state
        set pong [$r2 ping asdf]
        assert_equal $pong "asdf"
        $rd1 close; $r2 close
    }

    test {MULTI-EXEC body and script timeout} {
        # check that we don't run an incomplete transaction due to some commands
        # arriving during busy script
        set rd1 [redis_deferring_client]
        set r2 [redis_client]
        r config set lua-time-limit 10
        r set xx 1
        catch { $r2 multi; } e
        catch { $r2 incr xx; } e
        $rd1 eval {while true do end} 0
        after 200
        catch { $r2 incr xx; } e
        r script kill
        after 200 ; # Give some time to Lua to call the hook again...
        catch { $r2 exec; } e
        assert_match {EXECABORT*previous errors*} $e
        set xx [r get xx]
        # make sure that either the whole transcation passed or none of it (we actually expect none)
        assert { $xx == 1 || $xx == 3}
        # check that the connection is no longer in multi state
        set pong [$r2 ping asdf]
        assert_equal $pong "asdf"
        $rd1 close; $r2 close
    }

    test {just EXEC and script timeout} {
        # check that if EXEC arrives during timeout, we don't end up executing
        # actual commands during busy script, and also that we exit the multi state
        set rd1 [redis_deferring_client]
        set r2 [redis_client]
        r config set lua-time-limit 10
        r set xx 1
        catch { $r2 multi; } e
        catch { $r2 incr xx; } e
        $rd1 eval {while true do end} 0
        after 200
        catch { $r2 exec; } e
        assert_match {EXECABORT*BUSY*} $e
        r script kill
        after 200 ; # Give some time to Lua to call the hook again...
        set xx [r get xx]
        # make we didn't execute the transaction
        assert { $xx == 1}
        # check that the connection is no longer in multi state
        set pong [$r2 ping asdf]
        assert_equal $pong "asdf"
        $rd1 close; $r2 close
    }

    test {exec with write commands and state change} {
        # check that exec that contains write commands fails if server state changed since they were queued
        set r1 [redis_client]
        r set xx 1
        r multi
        r incr xx
        $r1 config set min-replicas-to-write 2
        catch {r exec} e
        assert_match {*EXECABORT*NOREPLICAS*} $e
        set xx [r get xx]
        # make sure that the INCR wasn't executed
        assert { $xx == 1}
        $r1 config set min-replicas-to-write 0
        $r1 close
    } {0} {needs:repl}

    test {exec with read commands and stale replica state change} {
        # check that exec that contains read commands fails if server state changed since they were queued
        r config set replica-serve-stale-data no
        set r1 [redis_client]
        r set xx 1

        # check that GET and PING are disallowed on stale replica, even if the replica becomes stale only after queuing.
        r multi
        r get xx
        $r1 replicaof localhsot 0
        catch {r exec} e
        assert_match {*EXECABORT*MASTERDOWN*} $e

        # reset
        $r1 replicaof no one

        r multi
        r ping
        $r1 replicaof localhsot 0
        catch {r exec} e
        assert_match {*EXECABORT*MASTERDOWN*} $e

        # check that when replica is not stale, GET is allowed
        # while we're at it, let's check that multi is allowed on stale replica too
        r multi
        $r1 replicaof no one
        r get xx
        set xx [r exec]
        # make sure that the INCR was executed
        assert { $xx == 1 }
        $r1 close
    } {0} {needs:repl cluster:skip}

    test {EXEC with only read commands should not be rejected when OOM} {
        set r2 [redis_client]

        r set x value
        r multi
        r get x
        r ping

        # enforcing OOM
        $r2 config set maxmemory 1

        # finish the multi transaction with exec
        assert { [r exec] == {value PONG} }

        # releasing OOM
        $r2 config set maxmemory 0
        $r2 close
    } {0} {needs:config-maxmemory}

    test {EXEC with at least one use-memory command should fail} {
        set r2 [redis_client]

        r multi
        r set x 1
        r get x

        # enforcing OOM
        $r2 config set maxmemory 1

        # finish the multi transaction with exec
        catch {r exec} e
        assert_match {EXECABORT*OOM*} $e

        # releasing OOM
        $r2 config set maxmemory 0
        $r2 close
    } {0} {needs:config-maxmemory}

    test {Blocking commands ignores the timeout} {
        r xgroup create s{t} g $ MKSTREAM

        set m [r multi]
        r blpop empty_list{t} 0
        r brpop empty_list{t} 0
        r brpoplpush empty_list1{t} empty_list2{t} 0
        r blmove empty_list1{t} empty_list2{t} LEFT LEFT 0
        r bzpopmin empty_zset{t} 0
        r bzpopmax empty_zset{t} 0
        r xread BLOCK 0 STREAMS s{t} $
        r xreadgroup group g c BLOCK 0 STREAMS s{t} >
        set res [r exec]

        list $m $res
    } {OK {{} {} {} {} {} {} {} {}}}

    test {MULTI propagation of PUBLISH} {
        set repl [attach_to_replication_stream]

        r multi
        r publish bla bla
        r exec

        assert_replication_stream $repl {
            {select *}
            {publish bla bla}
        }
        close_replication_stream $repl
    } {} {needs:repl cluster:skip}

    test {MULTI propagation of SCRIPT LOAD} {
        set repl [attach_to_replication_stream]

        # make sure that SCRIPT LOAD inside MULTI isn't propagated
        r multi
        r script load {redis.call('set', KEYS[1], 'foo')}
        r set foo bar
        set res [r exec]
        set sha [lindex $res 0]

        assert_replication_stream $repl {
            {select *}
            {set foo bar}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI propagation of EVAL} {
        set repl [attach_to_replication_stream]

        # make sure that EVAL inside MULTI is propagated in a transaction in effects
        r multi
        r eval {redis.call('set', KEYS[1], 'bar')} 1 bar
        r exec

        assert_replication_stream $repl {
            {select *}
            {set bar bar}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    test {MULTI propagation of SCRIPT FLUSH} {
        set repl [attach_to_replication_stream]

        # make sure that SCRIPT FLUSH isn't propagated
        r multi
        r script flush
        r set foo bar
        r exec

        assert_replication_stream $repl {
            {select *}
            {set foo bar}
        }
        close_replication_stream $repl
    } {} {needs:repl}

    tags {"stream"} {
        test {MULTI propagation of XREADGROUP} {
            set repl [attach_to_replication_stream]

            r XADD mystream * foo bar
            r XADD mystream * foo2 bar2
            r XADD mystream * foo3 bar3
            r XGROUP CREATE mystream mygroup 0

            # make sure the XCALIM (propagated by XREADGROUP) is indeed inside MULTI/EXEC
            r multi
            r XREADGROUP GROUP mygroup consumer1 COUNT 2 STREAMS mystream ">"
            r XREADGROUP GROUP mygroup consumer1 STREAMS mystream ">"
            r exec

            assert_replication_stream $repl {
                {select *}
                {xadd *}
                {xadd *}
                {xadd *}
                {xgroup CREATE *}
                {multi}
                {xclaim *}
                {xclaim *}
                {xgroup SETID * ENTRIESREAD *}
                {xclaim *}
                {xgroup SETID * ENTRIESREAD *}
                {exec}
            }
            close_replication_stream $repl
        } {} {needs:repl}
    }

    foreach {cmd} {SAVE SHUTDOWN} {
        test "MULTI with $cmd" {
            r del foo
            r multi
            r set foo bar
            catch {r $cmd} e1
            catch {r exec} e2
            assert_match {*Command not allowed inside a transaction*} $e1
            assert_match {EXECABORT*} $e2
            r get foo
        } {}
    }

    test "MULTI with BGREWRITEAOF" {
        set forks [s total_forks]
        r multi
        r set foo bar
        r BGREWRITEAOF
        set res [r exec]
        assert_match "*rewriting scheduled*" [lindex $res 1]
        wait_for_condition 50 100 {
            [s total_forks] > $forks
        } else {
            fail "aofrw didn't start"
        }
        waitForBgrewriteaof r
    } {} {external:skip}

    test "MULTI with config set appendonly" {
        set lines [count_log_lines 0]
        set forks [s total_forks]
        r multi
        r set foo bar
        r config set appendonly yes
        r exec
        verify_log_message 0 "*AOF background was scheduled*" $lines
        wait_for_condition 50 100 {
            [s total_forks] > $forks
        } else {
            fail "aofrw didn't start"
        }
        waitForBgrewriteaof r
    } {} {external:skip}

    test "MULTI with config error" {
        r multi
        r set foo bar
        r config set maxmemory bla

        # letting the redis parser read it, it'll throw an exception instead of
        # reply with an array that contains an error, so we switch to reading
        # raw RESP instead
        r readraw 1

        set res [r exec]
        assert_equal $res "*2"
        set res [r read]
        assert_equal $res "+OK"
        set res [r read]
        r readraw 0
        set _ $res
    } {*CONFIG SET failed*}
    
    test "Flushall while watching several keys by one client" {
        r flushall
        r mset a{t} a b{t} b
        r watch b{t} a{t}
        r flushall
        r ping
     }
}

start_server {overrides {appendonly {yes} appendfilename {appendonly.aof} appendfsync always} tags {external:skip}} {
    test {MULTI with FLUSHALL and AOF} {
        set aof [get_last_incr_aof_path r]
        r multi
        r set foo bar
        r flushall
        r exec
        assert_aof_content $aof {
            {multi}
            {select *}
            {set *}
            {flushall}
            {exec}
        }
        r get foo
    } {}
}