MELD Dev Diary 10

Lending & Borrowing

On-chain:

• Restructured contract files with separate files for each redeemer to optimize team productivity and enable parallel working.
• Implemented a simple Oracle contract for testing purposes.
• Updated & refactored pool and account contract data types and validation logic.
• Changed data types: Account Datum and Request.
• Rewrote Pool contract with more rules for deposit & withdraw.
• Added validation rules for withdraw and borrow event.
• Removed redundant checks in account contract.
• Moved some checks to more appropriate place between account and pool contracts.
• Integrated the new oracle contract to pool contract.
• Implemented Loan-To-Value function, added logic checking LTV to pool and account contract.
• Tagged numerical values to enforce type safety, make the calculation formulas more clear and avoid potential calculation mistakes.
• Changed manager contract validation logic to use auth token to authenticate protocol operator instead of using fixed PKH, enabling operator migration to future DAO governance.
• Integrated Ply to export Plutarch parameterized scripts and potentially export important on-chain functions to be evaluated off-chain.

Off-chain & tests:

• Updated contract exporter, deployer, API, and integration tests to be compatible with new contract validation logic.
• Wrote off-chain components for oracle contract.
• Updated deployer to deploy oracle contract.
• Implemented API to build oracle update transaction.
• Wrote integration tests for oracle API.
• Added new trace config to allow contract trace when running unit test and integration test, making it easier to debug.
• Updated input and output order when building batcher transaction.
• Bumped dependencies version (Plutarch-extra & Cardano-api).
• Wrote logging function to display transaction size & execution unit when running integration test.
• Created pool deposit use cases doc and sequence diagrams.

Infrastructure

• Continued work on Terraform code for lending and borrowing AWS infrastructure.
• Finished Fargate task definition for lending API.
• Created new repository for Discord managing bots.
• Migrated Discord chat cleaner bot from Google cloud platform to AWS Fargate, and dockerized bot.
• Migrated Discord join guard bot from Google cloud platform to AWS Fargate, and dockerized bot.
• Deployed and configured development virtual machine instance into AWS.

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