'Get All Match Keys' returns partial list

[dzvancuks]

In case I want to get long list of keys then Get All Match Keys will fail my test.

    # Set To Redis    some other keys so that DB would have data before cycle below

    FOR    ${counter}    IN RANGE    100
        Set To Redis    ${REDIS CONN}    MyKey_${counter}    ${counter}
    END
    @{key_list}=    Get All Match Keys    ${REDIS CONN}    MyKey_*    count=100
    ${count}         Get length          ${key_list}
    Should Be Equal As Integers    ${count}    100

==============================================================================
TEST                                                                  | FAIL |
84 != 100
------------------------------------------------------------------------------
Tests.MyTests                                                         | FAIL |
1 test, 0 passed, 1 failed
==============================================================================

And this is totally expected. Scan do not guarantee that it will get all keys in one go. That is count=100 means that Redis will atomically parse 100 keys and return current position for next scan operation:

redis-cli

> scan 0 match MyKey_* count 100
1) "88"
2)  1) "MyKey_35"
    2) "MyKey_54"
    3) "MyKey_68"
...

Scan operation should be continued until first value of return becomes 0 again (1) "88" should become 0)

See https://redis.io/docs/latest/commands/scan/