proc start_bg_complex_data {host port db ops} {
    set tclsh [info nameofexecutable]
    exec $tclsh tests/helpers/bg_complex_data.tcl $host $port $db $ops &
}

proc stop_bg_complex_data {handle} {
    catch {exec /bin/kill -9 $handle}
}

# Creates a master-slave pair and breaks the link continuously to force
# partial resyncs attempts, all this while flooding the master with
# write queries.
#
# You can specifiy backlog size, ttl, delay before reconnection, test duration
# in seconds, and an additional condition to verify at the end.
proc test_psync {descr duration backlog_size backlog_ttl delay cond} {
    start_server {tags {"repl"}} {
        start_server {} {

            set master [srv -1 client]
            set master_host [srv -1 host]
            set master_port [srv -1 port]
            set slave [srv 0 client]

            $master config set repl-backlog-size $backlog_size
            $master config set repl-backlog-ttl $backlog_ttl

            set load_handle0 [start_bg_complex_data $master_host $master_port 9 100000]
            set load_handle1 [start_bg_complex_data $master_host $master_port 11 100000]
            set load_handle2 [start_bg_complex_data $master_host $master_port 12 100000]

            test {Slave should be able to synchronize with the master} {
                $slave slaveof $master_host $master_port
                wait_for_condition 50 100 {
                    [lindex [r role] 0] eq {slave} &&
                    [lindex [r role] 3] eq {connected}
                } else {
                    fail "Replication not started."
                }
            }

            # Check that the background clients are actually writing.
            test {Detect write load to master} {
                wait_for_condition 50 100 {
                    [$master dbsize] > 100
                } else {
                    fail "Can't detect write load from background clients."
                }
            }

            test "Test replication partial resync: $descr" {
                # Now while the clients are writing data, break the maste-slave
                # link multiple times.
                for {set j 0} {$j < $duration*10} {incr j} {
                    after 100
                    # catch {puts "MASTER [$master dbsize] keys, SLAVE [$slave dbsize] keys"}

                    if {($j % 20) == 0} {
                        catch {
                            if {$delay} {
                                $slave multi
                                $slave client kill $master_host:$master_port
                                $slave debug sleep $delay
                                $slave exec
                            } else {
                                $slave client kill $master_host:$master_port
                            }
                        }
                    }
                }
                stop_bg_complex_data $load_handle0
                stop_bg_complex_data $load_handle1
                stop_bg_complex_data $load_handle2
                set retry 10
                while {$retry && ([$master debug digest] ne [$slave debug digest])}\
                {
                    after 1000
                    incr retry -1
                }
                assert {[$master dbsize] > 0}

                if {[$master debug digest] ne [$slave debug digest]} {
                    set csv1 [csvdump r]
                    set csv2 [csvdump {r -1}]
                    set fd [open /tmp/repldump1.txt w]
                    puts -nonewline $fd $csv1
                    close $fd
                    set fd [open /tmp/repldump2.txt w]
                    puts -nonewline $fd $csv2
                    close $fd
                    puts "Master - Slave inconsistency"
                    puts "Run diff -u against /tmp/repldump*.txt for more info"
                }
                assert_equal [r debug digest] [r -1 debug digest]
                eval $cond
            }
        }
    }
}

test_psync {ok psync} 6 1000000 3600 0 {
    assert {[s -1 sync_partial_ok] > 0}
}

test_psync {no backlog} 6 100 3600 0.5 {
    assert {[s -1 sync_partial_err] > 0}
}

test_psync {ok after delay} 3 100000000 3600 3 {
    assert {[s -1 sync_partial_ok] > 0}
}

test_psync {backlog expired} 3 100000000 1 3 {
    assert {[s -1 sync_partial_err] > 0}
}