MELD Dev Diary 13

Borrowing and Lending

Off-chain:

• Implemented an indexer tracking UTXOs locking operator NFTs controlling manager, pool and migration.
• Implemented oracle operator authorization via NFT instead of using pub key hash.
• Added the asset prices map to the request body to finish Oracle API endpoint to feed market prices.
• Check more conditions when building transactions to update the accounts at API to avoid users submitting invalid requests.
• Implemented API to get the current state of the pool contract.
• Separated the API documentation server from the main API server, enabling early deployment of the doc server.
• Added description and documentation for the API schema.
• Dockerized the API documentation server.
• Updated CI to push the faucet server and API documentation server docker images to ECR once they are built.
• Built builder image before application images to avoid duplicate build, which cause race condition problems and flaky build.
• Updated batching service to support building chaining transactions when the batcher needs to handle too many accounts in a batch.

Testing:

• Wrote some utility functions to query the latest state in integration tests to reduce test flakiness.
• Formalized some integration tests for the batching service and add more unit tests for the set collateral request.
• Implemented the base for functional tests to improve test writing efficiency.
• Refactored the test user credential for more clarity.
• Added a test case for oracle indexer.
• Used the environment variable to run either integration or functional tests from the same executable.
• Supported multiple test users in the integration test.

Faucet:

• Use a dedicated test key for the lending faucet operator.

Documentation:

• Updated lending transaction diagrams: create, update, and close account.

Infrastructure:

• Maintenance on old infrastructure, turning off some unused RDS databases.
• Planing cloud budget for upcoming year.
• Fargate service for lending-api docs.
• Configuring load balancer and target group for lending-api docs.

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