graninas/Hydra

Add "EvalSafely" method

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#16 opened on Apr 11, 2020

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Description

Implement EvalSafely method.

The method should allow to run a scenario safely. If the scenario throws exception (using throwException or error), the method's interpreter should catch the exception and return the control flow into the scenario.

data LangF next where
  EvalSafely :: LangL a -> (Either Error a -> next) -> LangF next

Contributor guide

Research direction
Study the interpreter implementation in the repository to understand how to handle the new EvalSafely constructor. Look for existing patterns like EvalCatch or similar exception handling in the codebase. Implement the EvalSafely case in the interpreter loop, ensuring that exceptions thrown by the scenario are caught and the control flow returns to the scenario continuation.
Tech stack
haskell
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
HaskellFree monads
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60