backend/src/main/java/dev/dinauer/ProcessRunner.java

package dev.dinauer;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.inject.Inject;

import org.eclipse.microprofile.context.ManagedExecutor;
import org.jboss.logging.Logger;

@ApplicationScoped
public class ProcessRunner
{
    @Inject
    Logger LOG;

    @Inject
    ManagedExecutor executor;

    public String runToText(String command)
    {
        return String.join("\n", runToLines(command));
    }

    public List<String> runToLines(String command)
    {
        LOG.infof("Running command: %s", command);
        ProcessBuilder pb = new ProcessBuilder(command.split("\\s+"));
        pb.redirectErrorStream(true);
        try
        {
            return runAndCollectLogs(pb);
        }
        catch (InterruptedException | IOException e)
        {
            throw new RuntimeException(e);
        }
    }

    private List<String> runAndCollectLogs(ProcessBuilder processBuilder) throws InterruptedException, IOException
    {
        List<String> text = new ArrayList<>();
        Process process = processBuilder.start();
        executor.submit(() -> {
            try (BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream())))
            {
                String line;
                while ((line = br.readLine()) != null)
                {
                    text.add(line);
                }
            }
            catch (IOException e)
            {
                throw new RuntimeException(e);
            }
        });
        boolean endedInTime = process.waitFor(10, TimeUnit.SECONDS);
        int exitCode = process.exitValue();
        process.destroyForcibly();
        if (endedInTime)
        {
            if (exitCode == 0)
            {
                return text;
            }
            else
            {
                throw new RuntimeException("Process finished with code " + exitCode);
            }
        }
        else
        {
            throw new RuntimeException("Process exceeded wait time of 10 sec.");
        }
    }
}