support for list data structure about summitdb

[komuw]

cc @tidwall

[tidwall]

Unfortunately I don't have any plans for adding list commands at this time.

One idea is to use the json commands inside a script.

For example and RPUSH could be:

> script load "sdb.call('set', KEYS[0], '[]', 'nx');sdb.call('jset', KEYS[0], '-1', ARGV[0]);return parseInt(sdb.call('jget', KEYS[0], '#'));"
"95e4005b8d5dff3778154ae39dd819a21c363d13"

Then you can use the script like:

> evalsha 95e4005b8d5dff3778154ae39dd819a21c363d13 1 mylist item1
1
> evalsha 95e4005b8d5dff3778154ae39dd819a21c363d13 1 mylist item2
2
> evalsha 95e4005b8d5dff3778154ae39dd819a21c363d13 1 mylist item3
3
> evalsha 95e4005b8d5dff3778154ae39dd819a21c363d13 1 mylist item4
4

For LPOP:

> script load "var res = sdb.call('jget', KEYS[0], '0');sdb.call('jdel', KEYS[0], '0');return res;"
"e3f15d9503ca033132d0e83b35ec3afcf28ef922"

> evalsha e3f15d9503ca033132d0e83b35ec3afcf28ef922 1 mylist
"item1"
> evalsha e3f15d9503ca033132d0e83b35ec3afcf28ef922 1 mylist
"item2"
> evalsha e3f15d9503ca033132d0e83b35ec3afcf28ef922 1 mylist
"item3"
> evalsha e3f15d9503ca033132d0e83b35ec3afcf28ef922 1 mylist
"item4"
> evalsha e3f15d9503ca033132d0e83b35ec3afcf28ef922 1 mylist
(nil)

The underlying data is just a json array. So you can get the entire list with a GET:

> evalsha 95e4005b8d5dff3778154ae39dd819a21c363d13 1 mylist item1
1
> evalsha 95e4005b8d5dff3778154ae39dd819a21c363d13 1 mylist item2
2
> GET mylist
"[\"item1\",\"item2\"]"

[komuw]

thanks