CodeCheck^® Build Instructions

Program Structure

CodeCheck has two parts:

A web application that manages submission and assignments. It is called play-codecheck because it is based on the Play framework. It is convenient, but not necessary, to run it in Docker.
A Dockerized service that compiles and runs programs, called comrun.

The play-codecheck program has a number of responsibilities:

Display problems, collect submissions from students, and check them
Manage problems from instructors
Manage assignments (consisting of multiple problems)
Interface with learning management systems through the LTI protocol

You can find a listing of the supported REST services in the app/conf/routes file.

The comrun service is extremely simple. You can find a basic description in the comrun/bin/comrun script.

For local testing of problems, there is also a handy command-line tool. This tool uses only the part of play-codecheck that deals with checking a problem (in the com.horstmann.codecheck package). The tool is called codecheck. It is created by the cli/build.xml Ant script.

Install Codecheck dependencies

These instructions are for Ubuntu 20.04LTS. If you are not running Ubuntu natively, run it in a virtual machine. If you were asked to use Github Codespaces, that should be set up for you. Otherwise, you need to set up your own virtual machine. These instructions should be helpful: https://horstmann.com/pfh/2021/vm.html

Open a terminal and install the dependencies

sudo apt-get update
sudo apt install openjdk-11-jdk git ant curl unzip

Install sbt for Linux (deb) or follow the instruction for your environment

echo "deb https://repo.scala-sbt.org/scalasbt/debian all main" | sudo tee /etc/apt/sources.list.d/sbt.list
echo "deb https://repo.scala-sbt.org/scalasbt/debian /" | sudo tee /etc/apt/sources.list.d/sbt_old.list
curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | sudo apt-key add
sudo apt-get update
sudo apt-get install sbt

Special Steps for Github Codespaces

Make a new Codespace by cloning the repository cayhorstmann/codecheck2

Open a terminal. Run

sed -i -e 's/root/ALL/' /etc/sudoers.d/codespace
cat /etc/sudoers.d/codespace

and verify that the contents is

codespace ALL=(ALL) NOPASSWD:ALL

Building the Command Line Tool

Make a directory /opt/codecheck and a subdirectory ext that you own:

sudo mkdir -p /opt/codecheck/ext
export ME=$(whoami) ; sudo -E chown $ME /opt/codecheck /opt/codecheck/ext

Clone the repo (unless you are in Codespaces, where it is already cloned)

git clone https://github.com/cayhorstmann/codecheck2

Get a few JAR files:

cd codecheck2/cli
mkdir lib
cd lib
curl -LOs https://repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-core/2.6.4/jackson-core-2.6.4.jar
curl -LOs https://repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-annotations/2.6.4/jackson-annotations-2.6.4.jar
curl -LOs https://repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-databind/2.6.4/jackson-databind-2.6.4.jar
cd ../../comrun/bin
mkdir lib
cd lib
curl -LOs https://repo1.maven.org/maven2/com/puppycrawl/tools/checkstyle/8.42/checkstyle-8.42.jar
curl -LOs https://repo1.maven.org/maven2/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar
curl -LOs https://repo1.maven.org/maven2/junit/junit/4.13.2/junit-4.13.2.jar
cd ../../../..

Build the command-line tool:

cd codecheck2
ant -f cli/build.xml

Test that it works:

/opt/codecheck/codecheck -t samples/java/example1

If you omit the -t, you get a report with your default browser instead of the text report.

Eclipse

If you work on your own machine, I recommend Eclipse as the IDE. If you use Codespaces, skip this section and read about the Visual Studio Code configuration instead.

Install Eclipse, following the instructions of the provider.

Run

sbt eclipse
sbt compile

Then open Eclipse and import the created project.

Make two debugger configurations. Select Run → Debug Configurations, right-click on Remote Java Application, and select New Configuration.

For the first configuration, specify:

Name: Debug (Attach)
Project: play-codecheck
Connection type: Standard
Host: localhost
Port: 9999

For the second debug configuration, set:

Name: Launch Main
Main class:
```
com.horstmann.codecheck.Main
```
Program arguments:
```
/tmp/submission /tmp/problem
```

VM arguments:

-Duser.language=en
-Duser.country=US
-Dcom.horstmann.codecheck.comrun.local=/opt/codecheck/comrun
-Dcom.horstmann.codecheck.report=HTML
-Dcom.horstmann.codecheck.debug

Environment variable COMRUN_USER: your username

Visual Studio Code

If you use Codespaces, you need to use Visual Studio Code as your IDE. If not, skip this section and follow the section about configuring Eclipse instead.

Run

sbt eclipse
sbt compile

Then open the base directory in Visual Studio Code. Visual Studio Code will read the project configuration from the Eclipse configuration.

In Visual Studio Code, click on the Run and Debug (triangle and bug) icon on the left. Select Run → Add Configuration from the menu. The file .vscode/launch.json is opened up. Set it to the following contents:

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "type": "java",
      "name": "Debug (Attach)",
      "request": "attach",
      "hostName": "localhost",
      "port": 9999,
      "projectName": "play-codecheck"
    },
    {
      "type": "java",
      "name": "Launch Main",
      "request": "launch",
      "mainClass": "com.horstmann.codecheck.Main",
      "projectName": "play-codecheck",
      "args": "/tmp/submission /tmp/problem",
      "vmArgs": [
        "-Duser.language=en",
        "-Duser.country=US",
        "-Dcom.horstmann.codecheck.comrun.local=/opt/codecheck/comrun",
        "-Dcom.horstmann.codecheck.report=HTML",
        "-Dcom.horstmann.codecheck.debug"
      ],
      "env": { "COMRUN_USER": "codespace" }
    }
  ]
}

Debugging the Command Line Tool

If you are making changes to the part of CodeCheck that does the actual code checking, such as adding a new language, and you need to run a debugger, it is easiest to debug the command line tool.

Make directories for the submission and problem files, and populate them with samples. For example,

rm -rf /tmp/submission /tmp/problem
mkdir /tmp/submission
cp samples/java/example1/*.java /tmp/submission
cp -R samples/java/example1 /tmp/problem

Set a breakpoint in app/com/horstmann/codecheck/Main.java and launch the debugger with the Launch Main configuration.

Building the Web Application

Run the play-codecheck server:

COMRUN_USER=$(whoami) sbt run

Point the browser to http://localhost:9090/assets/uploadProblem.html. Upload a problem and test it.

Note: The problem files will be located inside the /opt/codecheck/ext directory.

Debugging the Server

Run the play-codecheck server in debug mode:

COMRUN_USER=$(whoami) sbt -jvm-debug 9999 run

In Eclipse, select Run → Debug Configurations, select the configuration you created, and select Debug. Point the browser to a URL such as http://localhost:9090/assets/uploadProblem.html. Set breakpoints as needed.

Docker Installation

Skip this step if you are on Codespaces. Codespaces already has Docker installed.

Install Docker for Linux (deb) or follow the instruction for your environment

 sudo apt-get update
 
  sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

Add Docker’s official GPG key

 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Use the following command to set up the stable repository.

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Update the apt package index, and install the latest version of Docker Engine and containerd

 sudo apt-get update
 sudo apt-get install docker-ce docker-ce-cli containerd.io

Docker Local Testing

Build and run the Docker container for the comrun service:

docker build --tag codecheck:1.0-SNAPSHOT comrun
docker run -p 8080:8080 -it codecheck:1.0-SNAPSHOT &

Test that it works:

/opt/codecheck/codecheck -lt samples/java/example1

Create a file conf/production.conf holding an application secret:

echo "play.http.secret.key=\"$(head -c 32 /dev/urandom | base64)\"" > conf/production.conf
echo "com.horstmann.codecheck.comrun.remote=\"http://host.docker.internal:8080/api/upload\"" >> conf/production.conf

Do not check this file into version control!

Build and run the Docker container for the play-codecheck server:

sbt docker:publishLocal 
docker run -p 9090:9000 -it --add-host host.docker.internal:host-gateway play-codecheck:1.0-SNAPSHOT &

(Ignore the [error] labels during the Docker build. They aren't actually errors.)

Test that it works by pointing your browser to http://localhost:9090/assets/uploadProblem.html. Or if you use CodeSpaces, locate the Ports tab and open the local address for port 9090. Ignore the nginx error and paste /assets/uploadProblem.html after the URL.

Upload a problem: File name Numbers.java, file contents:

public class Numbers
{
//CALL 3, 4
//CALL -3, 3
//CALL 3, 0
   public double average(int x, int y)
   {
      //HIDE
      return 0.5 * (x + y);
      //SHOW // Compute the average of x and y
   }
}

Click the Submit Files button. You should see three passing test cases.

Kill both containers by running this command in the terminal:

docker container kill $(docker ps -q)

Cloud Provider Tools

Install Google Cloud CLI for Linux or follow the instruction for your environment

Open a terminal and download the Google Cloud SDK

curl -O https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-373.0.0-linux-x86_64.tar.gz

Extract the contents of the file to any location on your file system (preferably your home directory). To replace an existing installation, remove the existing google-cloud-sdk directory and then extract the archive to the same location.

tar -xf google-cloud-sdk-373.0.0-linux-x86.tar.gz

Run the script (from the root of the folder you extracted to) using the following command

./google-cloud-sdk/install.sh

To initialize the gcloud CLI, run gcloud init

./google-cloud-sdk/bin/gcloud init

Install the AWS CLI for Linux or follow the instruction for your environment

Open a terminal and download the AWS CLI installation file

curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"

Unzip the installer

unzip awscliv2.zip

Run the install program

sudo ./aws/install

Confirm the installation with the following command

aws --version

Configure the AWS CLI instructions

Access key ID
Secret access key
AWS Region
Output format

aws configure

Comrun Service Deployment {#service-deployment}

There are two parts to the CodeCheck server. We'll take them up one at a time. The comrun service compiles and runs student programs, isolated from the web app and separately scalable.

Here is how to deploy the comrun service to Google Cloud.

Make a Google Cloud Run project. Define a service comrun.

Then run:

export PROJECT=your Google project name
docker tag codecheck:1.0-SNAPSHOT gcr.io/$PROJECT/comrun
docker push gcr.io/$PROJECT/comrun

gcloud run deploy comrun \
  --image gcr.io/$PROJECT/comrun \
  --port 8080 \
  --platform managed \
  --region us-central1 \
  --allow-unauthenticated \
  --min-instances=1 \
  --max-instances=50 \
  --memory=512Mi \
  --concurrency=40

You should get a URL for the service. Make a note of it---it won't change, and you need it in the next steps. To test that the service is properly deployed, do this:

export REMOTE_URL=the URL of the comrun service
cd path to/codecheck2 
/opt/codecheck/codecheck -rt samples/java/example1

You should get a report that was obtained by sending the compile and run jobs to your remote service.

Alternatively, you can test with the locally running web app. In conf/production.conf, you need to add

com.horstmann.codecheck.comrun.remote= the URL of the comrun service

Play Server Deployment

Set environment variables and create a user in your Amazon AWS account:

ACCOUNT_ID=$(aws sts get-caller-identity --query "Account" --output text)
echo Account ID: $ACCOUNT_ID
REGION=$(aws configure get region)
echo Region: $REGION

USERNAME=codecheck

aws iam create-user --user-name $USERNAME
aws iam create-access-key --user-name $USERNAME

# IMPORTANT: Record AccessKeyId and SecretAccessKey

In Amazon S3, create a bucket whose name starts with the four characters ext. and an arbitrary suffix, such as ext.mydomain.com to hold the uploaded CodeCheck problems. Set the ACL so that the bucket owner has all access rights and nobody else has any.

# Change the suffix below
SUFFIX=mydomain.com

aws s3 mb s3://ext.$SUFFIX

cat <<EOF > CodeCheckS3.json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::ext.$SUFFIX"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::ext.$SUFFIX/*"
            ]
        }
    ]
}
EOF

aws iam create-policy --policy-name CodeCheckS3 --policy-document file://./CodeCheckS3.json

aws iam attach-user-policy --user-name $USERNAME \
  --policy-arn arn:aws:iam::$ACCOUNT_ID:policy/CodeCheckS3

If you use CodeCheck with LTI, you need to set up an Amazon Dynamo database. Create the following tables:

Name	Partition key	Sort key
CodeCheckAssignments	assignmentID
CodeCheckLTICredentials	oauth_consumer_key
CodeCheckLTIResources	resourceID
CodeCheckSubmissions	submissionID	submittedAt
CodeCheckWork	assignmentID	workID

The first three tables have no sort key. All types are String.

aws --region $REGION dynamodb create-table \
    --table-name CodeCheckAssignments \
    --attribute-definitions AttributeName=assignmentID,AttributeType=S \
    --key-schema AttributeName=assignmentID,KeyType=HASH \
    --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1

aws --region $REGION dynamodb create-table \
    --table-name CodeCheckLTICredentials \
    --attribute-definitions AttributeName=oauth_consumer_key,AttributeType=S \
    --key-schema AttributeName=oauth_consumer_key,KeyType=HASH \
    --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1

aws --region $REGION dynamodb create-table \
    --table-name CodeCheckLTIResources \
    --attribute-definitions AttributeName=resourceID,AttributeType=S \
    --key-schema AttributeName=resourceID,KeyType=HASH \
    --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1

aws --region $REGION dynamodb create-table \
    --table-name CodeCheckSubmissions \
    --attribute-definitions AttributeName=submissionID,AttributeType=S AttributeName=submittedAt,AttributeType=S \
    --key-schema AttributeName=submissionID,KeyType=HASH AttributeName=submittedAt,KeyType=RANGE \
    --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1

aws --region $REGION dynamodb create-table \
    --table-name CodeCheckWork \
    --attribute-definitions AttributeName=assignmentID,AttributeType=S AttributeName=workID,AttributeType=S \
    --key-schema AttributeName=assignmentID,KeyType=HASH AttributeName=workID,KeyType=RANGE \
    --provisioned-throughput ReadCapacityUnits=1,WriteCapacityUnits=1
    
    
cat <<EOF > CodeCheckDynamo.json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "dynamodb:PutItem",
                "dynamodb:UpdateItem",
                "dynamodb:DeleteItem",
                "dynamodb:BatchWriteItem",
                "dynamodb:GetItem",
                "dynamodb:BatchGetItem",
                "dynamodb:Scan",
                "dynamodb:Query",
                "dynamodb:ConditionCheckItem"
            ],
            "Resource": [
                "arn:aws:dynamodb:us-west-1:$ACCOUNT_ID:table/CodeCheck*",
                "arn:aws:dynamodb:us-west-1:$ACCOUNT_ID:table/CodeCheck*/index/*"
            ]
        }
    ]
}
EOF

aws iam create-policy --policy-name CodeCheckDynamo --policy-document file://./CodeCheckDynamo.json

aws iam attach-user-policy --user-name $USERNAME \
  --policy-arn arn:aws:iam::$ACCOUNT_ID:policy/CodeCheckDynamo

aws iam list-attached-user-policies --user-name $USERNAME

You need to populate the CodeCheckLTICredentials table with at least one pair oauth_consumer_key and shared_secret (both of type String). These can be any values. I recommend to use the admin's email for oauth_consumer_key and a random password for shared_secret.

USERNAME=codecheck
PASSWORD=$(strings /dev/urandom | grep -E '[^ ]{8}' | head -1)
echo Password: $PASSWORD
aws dynamodb put-item --table-name CodeCheckLTICredentials --item '{"oauth_consumer_key":{"S":"'${USERNAME}'"},"shared_secret":{"S":"'${PASSWORD}'"}}'

In your Google Cloud Run project, add another service play-codecheck.

Add the following to conf/production.conf:

play.http.secret.key= see above
com.horstmann.codecheck.comrun.remote=comrun host URL/api/upload
com.horstmann.codecheck.s3.accessKey= your AWS credentials
com.horstmann.codecheck.s3.secretKey=
com.horstmann.codecheck.s3bucketsuffix="mydomain.com"
com.horstmann.codecheck.s3.region=your AWS region such as "us-west-1"
com.horstmann.codecheck.repo.ext=""
com.horstmann.codecheck.storeLocation=""

Deploy the play-codecheck service:

export PROJECT=your Google project name

docker tag play-codecheck:1.0-SNAPSHOT gcr.io/$PROJECT/play-codecheck
docker push gcr.io/$PROJECT/play-codecheck

gcloud run deploy play-codecheck \
  --image gcr.io/$PROJECT/play-codecheck \
  --port 9000 \
  --platform managed \
  --region us-central1 \
  --allow-unauthenticated \
  --min-instances=1

You will get a URL for the service. Now point your browser to https://service url/assets/uploadProblem.html

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build-instructions.md

build-instructions.md

CodeCheck^® Build Instructions

Program Structure

Install Codecheck dependencies

Special Steps for Github Codespaces

Building the Command Line Tool

Eclipse

Visual Studio Code

Debugging the Command Line Tool

Building the Web Application

Debugging the Server

Docker Installation

Docker Local Testing

Cloud Provider Tools

Comrun Service Deployment {#service-deployment}

Play Server Deployment

Files

build-instructions.md

Latest commit

History

build-instructions.md

File metadata and controls

CodeCheck® Build Instructions

Program Structure

Install Codecheck dependencies

Special Steps for Github Codespaces

Building the Command Line Tool

Eclipse

Visual Studio Code

Debugging the Command Line Tool

Building the Web Application

Debugging the Server

Docker Installation

Docker Local Testing

Cloud Provider Tools

Comrun Service Deployment {#service-deployment}

Play Server Deployment

CodeCheck^® Build Instructions