Lua environmental differences

bmerry commented 6 years ago

The Lua scripting support (EVAL) does not perfectly emulate the environment available to a real redis script. Some known differences are:

Libraries such as cjson are not loaded
Setting of global variables is only checked each time a redis function is called, rather than being enforced by a metatable.
dofile and readfile are not disabled.
Various functions on the redis object are not implemented e.g. redis.sha1hex, redis.log
It doesn't prevent mutating commands after a random command (this will be a major task since it requires knowing which commands are mutating and/or random).
The random seed might not be reset with every script (untested)

For more details see the redis documentation and implementation.

M1ha-Shvn commented 4 years ago

Also found my scripts not working, as it requires cjson. I get attempt to index a nil value (global 'cjson') error

alifhughes commented 4 years ago

Just wondering if any new release planning to address the first point?

Libraries such as cjson are not loaded

bmerry commented 4 years ago

Just wondering if any new release planning to address the first point?

I'm afraid I don't get enough time to spend on fakeredis to make it better (mostly I just try to keep it working as new versions of dependencies come out), and I'm not sure quite what would be involved since I don't use Lua myself. Pull requests are welcome.

alifhughes commented 4 years ago

No worries, thanks for getting back to me quickly.

jamesls / fakeredis

Lua environmental differences #183