MELD Dev Diary 14

Borrowing and Lending

On-chain:

• Updated validation to enable setting different values for maximum loan-to-value and liquidation threshold.
• Revamped liquidation mechanism supporting full-liquidation.
• Separated checks for unique and non-unique request types to optimize validation logics.
• Supported repaying all remaining debt and withdrawing all deposited assets in order to close account.
• Refactored some conditions in account update to prepare for account creation with preloaded requests.

Off-chain:

• Implemented an API for querying latest account state.
• Tested & fixed remaining errors of batcher chaining transactions.
• Updated all services to query protocol parameters and era history periodically to be able to adapt protocol parameter updates.
• Setup oracle provider service to fetch price periodically from an external source to update the oracle UTXO.
• Refactor: Defined better type for price map in config and API.
• Refactor: Reduced some Docker build layers.Replace AssocMap by Map off-chain to match sorted map guarantee on-chain.
• Refactor: Made certain hard-coded variables configurable.

Testing

• Supported incremental logging in functional tests.
• Wrote unit test for cumulative interest rate calculation.
• Added more simulation scenarios to functional tests.
• Wrote unit tests for repay all remaining debt and withdraw all deposited assets.
• Refactor: Use exe directly produced by lending-tests.
• Refactor: Remove redundant test code.
• Refactor: Avoid update account if no requests in functional tests.
• Modified local config and functional test scenarios to run protocol with multi-asset pool.

Documentation

• Updated sequence diagram, change specified deposit action to update account for more generalization.
• Created some example data for API documentation server.
• Prepared documents & presentation for internal Cardano demo meeting

Infrastructure

• Prepared infrastructure for lending API docs (swagger) including AWS application load balancer and Fargate service.
• Created subdomain for lending API docs on Cloudflare
• Deployed terraform code for lending API docs.
• Continued work on IT budgeting for next year.
• Created architecture diagram for new MELDapp backend infrastructure.

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