As a first-time developer, the initial few weeks were spent on familiarizing myself with the codebase and setting up virtual machines. Once I felt more comfortable and confident, I worked on smaller system- related features such as Docker UI and worker status reports.

As the summer progressed, I was able to contribute to the auto-grading system as well as new continuous integration checks. In addition, I also spent a significant amount of time implementing and porting the development and test environments to HTTP/2 with TLS.

Auto-grading Features/Bug fixes

• Logging errors from the auto-grading code runner;

• A string parser for submission size in gradeable configs;

• Fixed a possible racing condition in bulk regrading with workers;

• Gradeable-level build log.

Worker Features

• Worker auto-exit when the disk space is critical;

• Refined Docker UI with more system information (services, OS, etc.);

• Worker update excluding list.

System Features

• Scripts for dispatching daemon jobs;

• HTTP/2 for development, production and test environments;

• Scripts for generating, trust certificates system-wide.

Misc

• Fixed missing images in Submini Polls;

• An auto-grading example with point deduction;

• CI checks for database dumps;

• Removed hard-coded arguments in scripts for creating sample courses;

• Fixed a permission error when displaying course materials.

Future Work

• Fine-grained Docker permission control;

• HTTP early hints.