User input validation for running deployed modules

[heikkilv]

There should be some kind of validation for the user input when accessing the /modules/<module_name>/<function_name> endpoint.

• [ ] Return a reasonable response if the given module or function does not exist.
• [ ] Validate the query parameters (param1, param2, ...) so that they match the parameter types required by the deployed function before trying to run the function in the deploeyd Wasm module. Return some kind of error message if the validation was not succesful.

Currently if the input parameters are not correct types (or convertable to them), the app either crashes or becomes unresponsive. For example, trying the fibonacci function with input 5.5 does not return anything and the app must be restarted.

Similar validation would likely be required for the other endpoints that access the deployed Wasm modules.

[pyjopeko]

Need to try pydantic to do this.

[heikkilv]

Pydantic could be used to check the Python types before calling the wasm module, and would be enough for most cases.

Some additional checks would likely be needed to handle for example the fact that Python has only one integer type with arbitrary precision, while the wasm function likely would take either 32-bit or 64-bit integers.