io.virtdata.docsys.core.DocServerApp Maven / Gradle / Ivy

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package io.virtdata.docsys.core;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

public class DocServerApp {
    public final static String APPNAME_DOCSERVER = "docserver";
    private final static Logger logger;

    static {
        // defer to an extant logger context if it is there, otherwise
        // assume a local and docserver specific logging configuration

        LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
        if (context.getLoggerList().size() == 1 && context.getLoggerList().get(0).getName().equals("ROOT")) {
            configureDocServerLogging(context);
            logger = LoggerFactory.getLogger(DocServerApp.class);
            logger.info("Configured logging system from logback-docsys.xml");
        } else {
            logger = LoggerFactory.getLogger(DocServerApp.class);
            logger.info("Configured logging within existing logging context.");
        }
    }

    public static void main(String[] args) {
        if (args.length > 0 && args[0].equals("help")) {
            showHelp();
        } else {
            runServer(args);
        }
    }

    private static void configureDocServerLogging(LoggerContext context) {
        JoranConfigurator jc = new JoranConfigurator();
        jc.setContext(context);
        context.reset();
        context.putProperty("application-name", APPNAME_DOCSERVER);
        InputStream is = DocServerApp.class.getClassLoader().getResourceAsStream("logback-docsys.xml");
        if (is != null) {
            try {
                jc.doConfigure(is);
            } catch (JoranException e) {
                System.err.println("error initializing logging system: " + e.getMessage());
                throw new RuntimeException(e);
            }
        } else {
            throw new RuntimeException("No logging context was provided, and " +
                    "logback-docsys.xml could not be loaded from the classpath.");
        }
    }

    private static void runServer(String[] serverArgs) {
        DocServer server = new DocServer();
        for (int i = 0; i < serverArgs.length; i++) {
            String arg = serverArgs[i];
            if (arg.matches("http//.*")) {
                server.withURL(arg);
            } else if (Files.exists(Path.of(arg))) {
                server.addPaths(Path.of(arg));
            } else if (arg.matches("\\d+")) {
                server.withPort(Integer.parseInt(arg));
            }
        }
//
        server.run();
    }

    private static void showHelp(String... helpArgs) {
        System.out.println(
                "Usage: " + APPNAME_DOCSERVER + " " +
                        " [url] " +
                        " [path]... " + "\n" +
                        "\n" +
                        "If [url] is provided, then the scheme, address and port are all taken from it.\n" +
                        "Any additional paths are served from the filesystem, in addition to the internal ones.\n"
        );
    }

    private static void search(String[] searchArgs) {
    }

    private static void listTopics() {

    }
}