CONTRACTS: Implement Comprehensive Error Handling

[truthixify]

Description

Standardize error handling across all contracts with detailed error codes and messages. Currently, error handling is inconsistent between contracts and lacks descriptive error information.

Files to Modify

• contracts/manage_hub/src/errors.rs - Expand error definitions
• contracts/access_control/src/errors.rs - Add missing error cases
• contracts/membership_token/src/lib.rs - Update error handling
• contracts/common_types/src/lib.rs - Add unified error types
• contracts/manage_hub/src/lib.rs - Update all function signatures
• contracts/manage_hub/src/subscription.rs - Replace panic! calls
• contracts/manage_hub/src/attendance_log.rs - Add validation errors

Key Changes Required

1. Unified Error System - Create a comprehensive error enum in common_types/src/lib.rs that covers all contract operations
2. Error Handling Updates - Replace all unwrap(), expect(), and panic! calls throughout the codebase with proper Result returns
3. Error Context - Add descriptive error messages and error categorization (recoverable vs critical errors)
4. Function Signature Updates - All public functions in lib.rs need to return Result<T, Error> instead of panicking
5. Cross-Contract Error Mapping - Implement proper error conversion between different contract modules
6. Error Recovery - Add mechanisms to handle and recover from non-critical errors where possible

Acceptance Criteria

• Create unified error enum in common_types
• Replace all panic! calls with proper error returns
• Add descriptive error messages for each error code
• Implement error recovery mechanisms where appropriate
• Update all contract methods to use Result types
• Add comprehensive error handling tests
• Add error logging and monitoring capabilities
• Document error codes for frontend integration

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[CMI-James]

@CMI-James has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

I would like to take on this issue, I worked on many smart contract issue on OnlyDust, and I will like to take on this issue,

ETA: 8 hours

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[devJaja]

@devJaja has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hello, I am a smart contract developer, open for contributions. contributed to over 20 project on OnlyDust, with expertise in Solidity, Cairo, TypeScript, and JavaScript. I am passionate about building secure and scalable blockchain solutions, and I would love the opportunity to contribute my skills toward solving this issue

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[Skinny001]

@Skinny001 has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

i will like to work on this issue

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[ChielokaCode]

@ChielokaCode has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hello Maintainers,

I would like to work on Issue #419: Implement Comprehensive Error Handling.

I have experience standardizing error systems and implementing robust Result-based handling across smart contracts.

My plan for this task is to:

• Define a unified error enum in common_types covering all contract operations.
• Replace all panic!, unwrap(), and expect() calls with proper Result returns.
• Add descriptive error messages, categorize recoverable vs critical errors, and implement cross-contract error mapping.
• Update all public function signatures to return Result and include error logging/monitoring.
• Write comprehensive tests to ensure all errors are handled and documented for frontend integration.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ChielokaCode to this issue.

[feyishola]

@feyishola has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

hi, i'm Feyishola a software developer with 3 years of experience. pls let me handle this.

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[Rajkoli145]

@Rajkoli145 has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hi team
I’d like to take this issue. I have experience standardizing error handling in Rust smart contracts (replacing panics, unified error enums, clean Result flows). Ready to start

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[ussyalfaks]

@ussyalfaks has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hi! I’d like to contribute to this issue by standardizing error handling across all contracts. I’m ready to create a unified error enum in common_types, replace all panic!/unwrap() calls with proper Result returns, add descriptive error messages, implement cross-contract error mapping, include recovery mechanisms for non-critical errors, and add comprehensive tests and logging for monitoring and frontend integration.

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[Emmyt24]

@Emmyt24 has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

I’d like to take on this task. I’ll introduce a unified error enum in contracts/common_types/src/lib.rs, expand/align per-contract errors, and refactor the codebase to replace all panic!/unwrap/expect paths with consistent Result<_, Error> returns (including cross-contract error mapping and non-critical recovery where applicable). I’ll also add full tests, structured error logging hooks, and a documented error-code reference for frontend integration.

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[ReinaMaze]

@ReinaMaze has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hello,
I’d like to apply for this issue and kindly request to be assigned to it.

I’ve gone through the requirements and I’m confident I can deliver the solution as described. I have experience contributing to open-source projects, and I’ll make sure to follow the project guidelines so the implementation is clean, properly tested, and meets the acceptance criteria.

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[Wetshakat]

@Wetshakat has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hello, i will like to work on this, i am a frontend/smartcontract developer with experience skill solving issues like this. i am also an active Open Contributor

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[Rampop01]

@Rampop01 has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

I would like to work on this issue . I understand the assignment and the requirements, and I’m confident in the approach needed to deliver the best solution. Kindly assign this task to me.

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[Akanimoh12]

@Akanimoh12 has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hi, I'd love to work on this issue. I'm a full-stack developer specializing in web apps and Smart Contracts, with experience in Next.js, TypeScript, Tailwind, and blockchain integrations.I can handle this confidently, here's my portfolio and key projects:

• https://i-predict.vercel.app/
• https://frontend-nine-mocha.vercel.app/
• www.shokoverse.xyz
• https://chessflip-celo.vercel.app/

Active OSS contributor.

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