JOJ3

Quick Start

1. Clone this repo in a Linux computer. For Windows, use WSL 2.

$ git clone ssh://[email protected]:2222/JOJ/JOJ3.git

2. Install Go. Also, make sure make and git are installed and all 3 programs are presented in $PATH.

   • If you have problem on connecting to the Go website and Go packages, download Go from studygolang and run go env -w GOPROXY=https://goproxy.io,direct to set the Go modules mirror proxy after installing Go.

3. Enable cgroup v2 for your OS. For WSL2, check here. So that you do not need root permission to run go-judge.

4. Clone go-judge.

$ git clone https://github.com/criyle/go-judge && cd go-judge
$ go build -o ./tmp/go-judge ./cmd/go-judge

5. Run go-judge.

$ # make sure you are in go-judge directory
$ ./tmp/go-judge -http-addr 0.0.0.0:5050 -grpc-addr 0.0.0.0:5051 -monitor-addr 0.0.0.0:5052 -enable-grpc -enable-debug -enable-metrics

6. Pull submodules. It might be slow, so only run it when the test branches are out of date.

$ # make sure you are in JOJ3 directory
$ make prepare-test

7. Build binaries in /cmd.

$ make

8. Check the functions of joj3 with the make test, which should pass all the test cases. The cases used here are in /examples.

For now, the following checking tools are needed for test:

1. clang/clang++
2. clang-tidy-18
3. cmake
4. make
5. cpplint

$ make test
go test -coverprofile cover.out -v ./...
...
PASS
coverage: 74.0% of statements
ok      github.com/joint-online-judge/JOJ3/cmd/joj3  2.290s  coverage: 74.0% of statements

For developers

1. Install pre-commit, golangci-lint.

2. Install the pre-commit hooks. It will run some checks before you commit.

$ pre-commit install
pre-commit installed at .git/hooks/pre-commit

3. You only need to run steps 5, 7, and 8 in the quick start during development. If the test cases need to be updated, step 6 is also needed.

How does it work?

These steps are executed in runner-images. We use sudo -u tt to elevate the permission and run joj3. All the secret files should be stored in the host machine with user tt and mounted into the runner (e.g. /home/tt/.config). Since the runner uses user student, we can keep the data safe. A single call to joj3 executable will run 2 parts:

1. Run JOJ3 stages
   1. Parse the message.
      • It will use the git commit message from HEAD. The message should meet the Conventional Commits specification. We use scope and description here.
      • If -tag is specified, then it should equal to the scope of the message, or JOJ3 will not run.
   2. Find the configuration file.
      • We have conf-root and conf-name specified in the CLI argument. Then the full path of configuration file is <conf-root>/<scope>/<conf-name>.
   3. Generate stages.
      • We have an empty list of stages at the beginning.
      • We check all the stages from the configuration file. Stages with empty group field will always be added. Stages with non-empty group field requires that value (case insensitive) appears in the commit description. e.g. with commit msg feat(h5/e3): joj msan, stages with the following group field will run: "", "joj", "msan".
      • Every stage needs to have an unique name, which means if two stages have the same name, only the first one will be added.
   4. Run stages.
      • By default, all the stages will run sequentially.
      • Each stage contains a executor and multiple parsers. The executor (currently only sandbox) executes the command and parsers parse the output generated by the executor. The parsers in one stage will run sequentially, and all the output will be aggregated (scores being summed up and comment being concatenated).
      • The parser can return a force quit, which means all the stages after it will be skipped, but the remaining parsers in the current stage will run.
   5. Generate results.
      • Once the running of stages is done, it will generate a result file where the path is specified in the configuration file.
2. Run Joint-Teapot.
   1. Generally speaking, it reads the JOJ3 results file and output results on Gitea.
   2. With joint-teapot joj3-all, it will do the following things:
      1. Create/Edit an issue in the submitter's repo to show the results.
      2. Update the scoreboard file in grading repo.
      3. Update the failed table file in grading repo.

Components

Binaries (under /cmd and /pkg)

JOJ3

JOJ3 itself. Parsers and executors are compiled into the JOJ3 binary.

Sample

Just a sample on how to write an executable that can be called by the executor.

HealthCheck

The repohealth check will return a json list to for check result. The structure follows the score-comment pattern.

HealthCheck currently includes, reposize, forbidden file, Metafile existence, non-ascii character in file and message, release tag, and ci files invariance check.

The workflow is joj3 pass cli args to healthcheck binary. See ./cmd/healthcheck/main.go to view all flags.

Executors (under /internal/executors)

Dummy

Do not execute any command. Just return empty ExecutorResult slice.

Sandbox

Run the commands in go-judge and output the ExecutorResult slice. Note: we communicate with go-judge using gRPC, which means go-judge can run anywhere as the gRPC connection can be established. In deployment, go-judge runs in the host machine of the Gitea runner.

Parsers (under /internal/parsers)

Clang Tidy

Parser for clang-tidy, check /examples/clangtidy on how to call clang-tidy with proper parameters.

Cppcheck

Parser for cppcheck, check /examples/cppcheck on how to call cppcheck with proper parameters.

Cpplint

Parser for cpplint, check /examples/cpplint on how to call cpplint with proper parameters.

Diff

Compare the specified output of ExecutorResult with the content of the answer file. If they are the same, then score will be given. Just like a normal online judge system.

Dummy

Does not parse the output of ExecutorResult. It just output what is set inside the configuration file as score and comment. Currently it is used to output metadata for joint-teapot.

In joint-teapot, it will take the content before - of the comment of the first stage with name metadata as the exercise name and record in the scoreboard. (e.g. If the comment is p2-s2-0xdeadbeef, then the exercise name is p2.)

The comment in metadata can also be used to skip teapot commands. With skip-teapot in the comment, teapot will not run. And with skip-scoreboard, skip-failed-table, and skip-result-issue, only the corresponding step will be skipped, while the others will be executed. (e.g. If the comment is p2-s2-0xdeadbeef-skip-scoreboard-skip-result-issue, then only failed table step in teapot will run.)

Healthcheck

Parser for the healthcheck binary mentioned before.

Keyword

Match the given keyword from the specified output of ExecutorResult. For each match, a deduction of score is given. Can be useful if we do not have a specific parser for a code quality tool. Check /examples/keyword.

Result Status

Only check if all the status of the executor is StatusAccepted. Can be used to check whether the command run in the executor exit normally.

Sample

Parser for the sample binary mentioned before. Only used as a sample.

Models (for developers only)

The program parses the configuration file to run multiple stages.

Each stage contains an executor and parser. An executor just executes a command and returns the original result (stdout, stderr, output files). We can limit the time and memory used by each command in the executor. We run all kinds of commands in executors of different stages, including code formatting, static check, compilation, and execution. A parser takes the result and the configuration of the stage to parse the result and return the score and comment. e.g. If in the current stage, the executor runs a clang-tidy command, then we can use the clang-tidy parser in the configuration file to parse the stdout of the executor result and check whether some of the rules are followed. We can deduct the score and add some comments based on the result, and return the score and comment as the output of this stage. This stage ends here and the next stage starts.

In codes, an executor takes a Cmd and returns an ExecutorResult, while a parser takes an ExecutorResult and its conf and returns a ParserResult and bool to indicate whether we should skip the rest stages.

Cmd

Check Cmd at https://github.com/criyle/go-judge#rest-api-interface.

Some difference:

• CopyInDir string: set to non-empty string to add everything in that directory to CopyIn.
• CopyInCached map[string]string: key: file name in the sandbox, value: file name used in CopyOutCached.
• LocalFile: now supports the relative path

ExecutorResult

Check the Result at https://github.com/criyle/go-judge#rest-api-interface.

ParserResult

• Score int: score of the stage.
• Comment string: comment on the stage.