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- Define CONTRACT-OWNER constant to represent the contract owner. - Add error constants for various error scenarios including: - ERR-NOT-AUTHORIZED - ERR-INVALID-AMOUNT - ERR-INSUFFICIENT-BALANCE - ERR-CONTRACT-NOT-INITIALIZED - ERR-ALREADY-INITIALIZED - ERR-POOL-FULL - ERR-DAILY-LIMIT-EXCEEDED - ERR-INVALID-POOL - ERR-DUPLICATE-PARTICIPANT - ERR-INSUFFICIENT-POOL-FUNDS - ERR-POOL-NOT-READY These constants will be used throughout the contract to handle various error conditions and manage contract ownership.
- Define constants for max daily limit, max pool participants, max transaction amount, min pool amount, and mixing fee percentage. - Initialize data variables for contract state and total protocol fees.
…s, and participant status - Define maps to track user balances, daily transaction totals, mixer pool details, and participant status.
- Define a public function to initialize the contract. - Ensure the contract is not already initialized and the sender is authorized.
- Define a public function to handle deposits. - Ensure the contract is initialized and not paused. - Validate the deposit amount and daily transaction limits. - Update user balances and daily transaction totals.
- Define a public function to handle withdrawals. - Ensure the contract is initialized and not paused. - Validate the withdrawal amount and daily transaction limits. - Check user balance and update it along with daily transaction totals.
- Define a public function to create a mixer pool. - Ensure the contract is initialized and not paused. - Validate the initial amount and pool ID. - Check user balance and update it along with pool details and participant status.
- Define a public function to join a mixer pool. - Ensure the contract is initialized and not paused. - Validate the amount and pool status. - Check user balance, pool capacity, and participant status. - Update pool details, participant status, and user balance.
- Define a public function to distribute pool funds. - Ensure the pool is active and ready for distribution. - Calculate and deduct the mixing fee. - Distribute the remaining funds to participants. - Update protocol fees and mark the pool as inactive.
- Define a public function to toggle the contract pause state, accessible only by the contract owner. - Define a public function to withdraw protocol fees, accessible only by the contract owner.
- Define functions to get user balance, daily limit remaining, contract status, and pool details. - Ensure these functions are read-only and provide necessary contract information.
- Define a private function to distribute funds to a participant. - Calculate the per-participant amount after deducting the mixing fee. - Transfer the calculated amount to the participant and update the result.
- Provide an overview of the Mixer Contract and its key features. - List public functions with descriptions of their purposes and usage. - Include read-only functions for retrieving contract data. - Outline error handling mechanisms and specific error codes. - Offer best practices and security considerations for users. - Detail deployment prerequisites and recommended workflow.
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Overview
This pull request introduces a comprehensive Mixer Smart Contract for the Stacks blockchain, providing a secure and feature-rich mechanism for creating and managing fund mixing pools.
Key Features Implemented
Changes Detailed
Contract Structure
Core Functions
Initialization
Fund Management
Mixer Pool Management
Administrative Functions
Security Considerations
Error Handling
Comprehensive error codes covering scenarios like:
Testing Recommendations
Next Steps
Changelog