Feature/blk 129 precompile for the delegate state in parachainstaking #374
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added 2 commits
August 11, 2025 12:22
This implementation allows querying delegator information from the EVM layer: Features: - Returns delegator's delegations to various collators with amounts - Delegations are sorted by stake amount (descending order) - Returns empty vector for non-existent delegators - Zero address parameter reserved for future 'get all delegators' functionality Interface: - Function: getDelegatorState(bytes32 delegator) - Selector: 0x72a09ed8 - Returns: CollatorDelegatorState[] memory Test Coverage: - Basic delegator state queries - Multi-collator delegation scenarios - Stake amount sorting verification - Edge cases (zero address, non-existent delegators)
…tion Features added: - Paging support for getDelegatorState function with offset/limit parameters - Zero address (0x0) functionality to retrieve all delegators' states - Proper handling of edge cases (U256::MAX values, out-of-bounds offsets) - Comprehensive test coverage with concrete data verification Technical improvements: - Made DelegatorState public in pallet for iteration support - Fixed U256::MAX conversion issues in paging logic - Enhanced Solidity interface with proper documentation - Added robust test suite with 15 tests covering all scenarios Test coverage: - Basic delegator state queries with exact data verification - Multi-delegator paging scenarios with predictable results - Boundary testing (MAX values, empty results, non-existent delegators) - Edge case handling and error conditions - Gas accounting verification
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The preview deployment is ready. 🟢 Open Preview | Open Build Logs Last updated at: 2025-08-17 07:01:59 CET |
Apply cargo fmt to fix code formatting in the parachain-staking precompile implementation and tests.
added 3 commits
August 11, 2025 17:23
…lity Major improvements: - Extract AccountConverter helper to eliminate code duplication across methods - Create GasCalculator utility with centralized constants and calculations - Split complex get_delegator_state_paged method into focused helper functions - Optimize get_all_delegators_paged with lazy evaluation using iterator chaining - Consolidate collator list methods to remove duplicated iterator patterns Performance gains: - Memory: O(n) -> O(k) for bulk delegator queries (only process requested pages) - CPU: Avoid processing unwanted data with skip().take() iterator chaining - Gas accounting: Accurate costs based on actual processed entries Code quality improvements: - Reduced cyclomatic complexity from 8+ to 2-3 branches per method - Eliminated ~40% code duplication between similar methods - Centralized magic gas numbers (3789, 2580, 7200) with clear documentation - Maintained full backward compatibility - all 15 tests pass All existing functionality preserved with cleaner, more maintainable implementation.
Update gas cost assumptions to be more realistic: - COLLATOR_POOL_READ: 7200 -> 3072 gas units (64 vs 150 collators) - Updated documentation to reflect realistic 64 collator pool size - Proportional calculation: 7200 * (64/150) = 3072 This provides more accurate gas accounting for actual network conditions while maintaining the same calculation methodology.
Breaking changes and improvements: - Remove single-parameter getDelegatorState(bytes32) - all calls now require offset/limit - Add strict validation: forbid limit=0 and limit>512 for all query types - Implement consistent MAX_DELEGATORS_PER_QUERY=512 limit across bulk and single queries - Return clear error messages instead of silently capping or allowing dangerous operations Validation rules: - limit=0: "Invalid limit: must be greater than 0" - limit>512: "Invalid limit: maximum allowed is 512" - offset too large: "Invalid offset: value too large" This forces explicit pagination and prevents resource exhaustion while providing predictable behavior and clear error feedback to users. Updated selector: getDelegatorState now only supports 0x657c7960 (3-parameter version) All 16 tests pass with comprehensive validation coverage.
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Pull Request Overview
This PR introduces a new precompile function for querying delegator states in the parachain staking module. The feature provides comprehensive delegation information with pagination support and sorting capabilities.
- Adds
getDelegatorStatefunction with pagination support to retrieve delegator delegation information - Implements efficient gas cost calculation and validation for bulk operations
- Includes comprehensive test coverage for various scenarios including edge cases and pagination
Reviewed Changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| precompiles/parachain-staking/src/lib.rs | Core implementation of the getDelegatorState function with helper utilities and gas calculation |
| precompiles/parachain-staking/src/tests.rs | Comprehensive test suite covering functionality, edge cases, and pagination scenarios |
| precompiles/parachain-staking/ParachainStaking.sol | Solidity interface definitions for the new delegator state structures and functions |
| pallets/parachain-staking/src/lib.rs | Changes DelegatorState storage visibility from private to public |
Remove unnecessary borrows from format\! calls in error messages.
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Update comments to clearly distinguish between: - Delegator order when querying all: NOT sorted (unpredictable storage order) - Individual delegator's delegations: ARE sorted by stake descending This prevents confusion about what is and isn't sorted in the API responses.
Add required imports for no_std environment: - extern crate alloc for format! macro - vec macro from sp_std for vec![] usage
Adjust line breaks in sorting behavior documentation for consistency.
Always apply limit when paging, even when offset is 0. Previously limit was only applied when offset > 0, causing tests to fail.
- Remove single-parameter getDelegatorState from Solidity interface - Remove redundant limit_usize == usize::MAX checks (impossible with MAX_DELEGATORS_PER_QUERY=512) - Remove unnecessary actual_limit variable - Simplify code while maintaining all functional validations
- Accept Ethereum address as input parameter (address delegator) - Convert Ethereum address to substrate account internally via AddressMapping - Keep bytes32 output in response structs (shows substrate account) - Update function selector from 0x657c7960 to 0xbeae0df4 - Update all test calls to use Address type for inputs - Add H160 import and address conversion helpers
…g precompile - Adds new view function to convert Ethereum addresses to substrate account hashes - Provides transparency into how AddressMapping works internally - Useful for debugging address mapping between Ethereum and Substrate - Function selector: 0xb76f87bf - Includes comprehensive tests and Solidity interface documentation
- Remove trailing whitespace in documentation comments - Clean up formatting in test code
…tate-in-parachainstaking
…g precompile - Clarify that getDelegatorState accepts Ethereum addresses as input but returns substrate account hashes - Add detailed INPUT/OUTPUT ADDRESS FORMAT section to both Rust and Solidity documentation - Specify that input parameters use Ethereum addresses (20 bytes) for user convenience - Explain that output structs contain substrate account hashes (32 bytes) for internal consistency - Makes the address conversion behavior transparent to developers
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