Add RPC chainId validation #267
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Implements automatic validation of RPC endpoints to ensure they match the expected chain IDs from CAIP-2 identifiers. This prevents misconfiguration errors where an RPC URL points to the wrong chain. Features: - Validates protocol chain and all indexed chains on startup - Calls eth_chainId on each EVM RPC endpoint - Compares returned chain ID with expected value from CAIP-2 - Fails fast with clear error message on mismatch - Skips validation for non-EVM chains (non-eip155 namespace) Example output on success: ✓ Chain ID validated for eip155:42161: RPC https://arbitrum.example.com correctly returns chain ID 42161 Example output on failure: ERROR Chain ID mismatch for eip155:42161: RPC https://ethereum.example.com returned chain ID 1 (0x1), expected 42161 This addresses the safety requirement from TODO.md section 7. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
Added 6 unit tests that verify chain validation logic without requiring real RPC endpoints: - test_validate_chain_id_success: Verifies matching chain IDs pass - test_validate_chain_id_mismatch: Verifies mismatched IDs fail with clear error - test_validate_chain_id_hex_variations: Tests different hex formats (0x1, 0x01, 0xa4b1) - test_validate_chain_id_skips_non_evm: Ensures non-EVM chains are skipped - test_validate_chain_id_invalid_hex: Tests graceful handling of malformed responses - test_caip2_parsing: Verifies CAIP-2 parsing for both EVM and non-EVM chains Implemented a MockTransport that simulates RPC responses, allowing thorough testing of all validation paths without network dependencies. All 20 oracle tests pass. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
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