[CONTRACT] Implement Contract Integration Layer

[obaremoelijah274-hash]

🎯 Context & Impact

With multiple contracts (guild, bounty, payment, milestone, etc.), we need a robust integration layer to enable seamless communication and event coordination. Without this, contracts operate in silos and cannot react to each other's state changes.

Why this matters:

• Enables complex workflows across multiple contracts
• Provides unified event system for frontend tracking
• Ensures data consistency across contracts
• Simplifies contract upgrades and versioning
• Creates a cohesive platform experience

📋 Scope

Implement a Soroban integration layer that provides cross-contract communication, unified events, and contract registry management.

What's included:

• Contract registry for address management
• Unified event emission system
• Cross-contract authorization framework
• Contract interface definitions
• Event subscription and filtering
• Contract version tracking
• Integration helpers and utilities
• Error handling standardization

What's NOT included:

• Oracle integration (future)
• Cross-chain communication
• Off-chain event processing

🛠️ Implementation Guidelines

File Structure

Create the following files in the contract/ directory:

contract/
├── src/
│   ├── integration/
│   │   ├── mod.rs
│   │   ├── registry.rs
│   │   ├── events.rs
│   │   ├── auth.rs
│   │   └── types.rs
│   ├── interfaces/
│   │   ├── mod.rs
│   │   ├── guild.rs
│   │   ├── bounty.rs
│   │   ├── payment.rs
│   │   └── common.rs
│   └── utils/
│       ├── mod.rs
│       ├── errors.rs
│       └── validation.rs

Key Data Structures

Define:

• ContractRegistry (mapping of contract types to addresses)
• ContractType enum (Guild, Bounty, Payment, Milestone, Dispute, Reputation, Treasury, Subscription, Governance)
• Event struct (event_type, contract_source, timestamp, data)
• EventType enum (comprehensive list of all platform events)
• ContractVersion struct (contract_type, version, address, deployed_at)
• Error codes enum with descriptive messages

Core Functions to Implement

Registry Management:

1. register_contract(env, contract_type, address, version) → bool
2. get_contract_address(env, contract_type) → Address
3. update_contract(env, contract_type, new_address, new_version) → bool
4. get_all_contracts(env) → Vec<(ContractType, Address, Version)>

Event System:
5. emit_event(env, event_type, source_contract, data) → bool
6. get_events(env, filters, from_timestamp, limit) → Vec
7. subscribe_to_events(env, subscriber, event_types) → bool

Cross-Contract Operations:
8. call_guild_contract(env, function_name, params) → Result
9. call_bounty_contract(env, function_name, params) → Result
10. verify_cross_contract_auth(env, caller, target_contract, required_permission) → bool

Utilities:
11. validate_address(env, address) → bool
12. format_error(env, error_code, context) → Error
13. create_event_id(env) → u128

Standard Event Types

Define events for all major operations:

• Guild: Created, MemberAdded, MemberRemoved, RoleUpdated
• Bounty: Created, Funded, Claimed, Completed, Cancelled
• Payment: Distributed, PoolCreated, RecipientAdded
• Milestone: Created, Started, Submitted, Approved, PaymentReleased
• Dispute: Created, VoteCast, Resolved
• Reputation: Updated, AchievementAwarded, TierChanged
• Treasury: Deposited, WithdrawalProposed, TransactionExecuted
• Subscription: Created, PaymentExecuted, Cancelled
• Governance: ProposalCreated, Voted, ProposalExecuted

Constraints & Requirements

• Only admin can register/update contracts
• All contracts must emit standardized events
• Event data must be versioned for compatibility
• Cross-contract calls must validate permissions
• Contract addresses cannot be zero
• Version numbers must increment
• Events immutable once emitted
• Maximum event data size: 1KB

Edge Cases to Handle

• Calling unregistered contracts
• Contract address collisions
• Event storage limits (pagination)
• Malformed event data
• Circular contract dependencies
• Failed cross-contract calls
• Version incompatibilities
• Registry corruption recovery

✅ Definition of Done

Your PR should include:

• Complete implementation of all 13 core functions
• Contract registry with CRUD operations
• Unified event system with all event types
• Cross-contract call framework
• Interface definitions for all contract types
• Comprehensive error handling
• Utility functions for common operations
• Comprehensive unit tests (>85% coverage)
• Integration tests with at least 3 contracts
• Event emission and retrieval tests
• Documentation for all public interfaces
• Examples of cross-contract interactions

🧪 Testing Requirements

Provide tests that cover:

1. Contract registration and updates
2. Address retrieval
3. Event emission from multiple sources
4. Event filtering and querying
5. Cross-contract authorization
6. Failed call handling
7. Event pagination
8. Version tracking
9. Edge cases (invalid addresses, unregistered contracts)
10. Integration scenarios (bounty creation → treasury funding → payment)

📚 Resources

• Soroban Cross-Contract Calls
• Event Design Patterns
• Contract Interfaces

🔍 Review Criteria

Your submission will be evaluated on:

• Completeness: Are all integration points covered?
• Reliability: Is cross-contract communication robust?
• Usability: Are interfaces developer-friendly?
• Performance: Is event querying optimized?
• Test Coverage: Are integration scenarios tested?
• Documentation: Are interfaces well-documented?

💡 Questions?

Comment on this issue if you need clarification on:

• Event schema design
• Cross-contract authorization patterns
• Registry security model
• Interface definition approach

[zhaog100]

/attempt

[zhaog100]

/attempt

[OlufunbiIK]

@OlufunbiIK has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi Maitainer,

Please, can I work on this issue?

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[drips-wave]

Congratulations, @OlufunbiIK! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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