JOJ3

Table of Contents

• Quick Start
• Workflow
• Models
• Project Structure
• Further Documentation

Quick Start

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

$ git clone ssh://git@focs.ji.sjtu.edu.cn: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. Also, enable linger for the user you used to run go-judge if you are using systemd, e.g. if the user is go-judge, run loginctl enable-linger go-judge. So that you do not need root permission to run go-judge (it can create a nesting cgroup in its user slice).

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 It might be slow, so only run it when the test branches are out of date.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

Workflow

These steps are executed within runner-images, as specified in the YAML files under .gitea/workflows in student repositories. Our customized act_runner ensures that only labeled images controlled by administrators can be used. Furthermore, our private Docker registry requires authentication for pushing images, so only administrator-created images can be used to run joj3.

Inside the container created by act_runner, we use sudo -E -u tt to elevate permissions and run joj3 with environment variables provided by Gitea Actions. All sensitive files should be stored on the host machine under the tt user's directory and mounted into the runner (e.g., /home/tt/.config). Allowed mount directories are also limited in act_runner configuration. Since the default student user inside the container (created from runner-images) shares the same UID as the student user on the host, which does not have the permission to access tt's files. This helps ensure data security.

Here are the steps joj3 will run.

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. Also, a suffix [group] will be used to decide which stages will be run later.
   • 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>.
   • If that configuration file does not exist, and fallback-conf-name is passed, it will try to read <conf-root>/<fallback-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 group. e.g. with commit msg feat(h5/e3): joj msan [joj], stages with the following group field will run: "", "joj". Currently, it does not support multiple groups within one commit. If the group specified in the commit message is [all], then all groups will run.
   • 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 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.
6. Run optional stages.
   • If pre-stages and post-stages is specified, it will run before step 4 and after step 5, responsively. The result of these optional stages will not affect regular stages. Now we run joint-teapot in post-stages as it needs the output file from regulara stages to post the issue to the corresponding repo for students.

Models

The program parses the configuration file to run multiple stages.

Each stage contains an executor and multiple parsers. An executor takes a Cmd and returns an ExecutorResult, while a parser takes an ExecutorResult and its configuration and returns a ParserResult and bool to indicate whether we should skip the rest stages.

StageExecutor.Cmd (executor config)

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 (executor result)

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

StageParser.Conf (parser config)

Check https://pkg.go.dev/github.com/joint-online-judge/JOJ3/internal/parser. type Conf in each package defines the accepted config for each kind of parser.

ParserResult (parser result)

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

Project Structure

+---.gitea       # Gitea meta files
+---cmd          # Executable applications
+---examples     # Examples & testcases from submodules
+---internal     # Packages for internal use only
|   +---executor # Executors
|   +---parser   # Parsers
|   \---stage    # Structure and logic for stages
+---pkg          # Packages intended for use by other applications
\---scripts      # Various helper scripts

Further Documentation

https://pkg.go.dev/github.com/joint-online-judge/JOJ3 https://deepwiki.com/joint-online-judge/JOJ3