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The function must be declared with the no-writes flag for it to be used with callRo.

​
Arguments

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function
string
required
The function name.
​
keys
string[]
The keys that the function accesses.
The function can only read from the keys that are provided in the keys argument.
​
args
string[]
The arguments for the function.

​
Response

The return value of the function.
const code = `
#!lua name=ro_lib
  
local function get_value(keys, args)
  return redis.call('GET', keys[1])
end

redis.register_function({
  function_name='get_value', 
  callback=get_value, 
  flags={ 'no-writes' }
})
`;

await redis.functions.load({ code, replace: true });

// Call the read-only function
// Note: We can modify the keys usage here, but since it represents a read-only operation
// and we marked it with 'no-writes', it is safe to use callRo.
const value = await redis.functions.callRo("get_value", ["mykey"])