transceivr/src/main/java/com/acdp/transceivr/WebServer.java

package com.acdp.transceivr;

import com.eclipsesource.json.JsonArray;
import info.faljse.SDNotify.SDNotify;
import org.slf4j.LoggerFactory;
import spark.Request;
import spark.Response;

import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ConcurrentHashMap;

import static spark.Spark.*;


public class WebServer {
    private final static org.slf4j.Logger logger = LoggerFactory.getLogger(WebServer.class);
    private final static int BS = 2014;
    private final Params params;
    private int nextID = 1;
    private ConcurrentHashMap<Integer, Transfer> uploads = new ConcurrentHashMap<>();
    private Timer t = new Timer("cleanup", true);

    public WebServer(Params params) {
        this.params = params;
    }

    public void start() {
        port(params.port);
        if (!params.webroot.isEmpty())
            staticFileLocation(params.webroot);
        else
            staticFiles.location("/webroot");
        get("/zero", (req, res) -> {
            var os = res.raw().getOutputStream();
            var ba = new byte[BS];
            var lengthParam = req.queryParams("length");
            if (lengthParam != null) {
                res.header("Content-Length", lengthParam);
                int length = Integer.parseInt(lengthParam);
                for (; length > BS; length -= BS)
                    os.write(ba);
                os.write(ba, 0, length);
            } else {
                while (true)
                    os.write(ba);
            }
            return "";
        });
        post("/null", (req, res) -> {
            var is = req.raw().getInputStream();
            var ba = new byte[BS];
            while (is.read(ba) != -1) ;
            res.status(200);
            return "";
        });
        put("/null", (req, res) -> {
            var is = req.raw().getInputStream();
            var ba = new byte[BS];
            while (is.read(ba) != -1) ;
            res.status(200);
            return "";
        });
        post("/cancel", (req, res) -> {
            int id = Integer.parseInt(req.queryParams("id"));
            var t = uploads.get(id);
            t.canceled = true;
            t.call.cancel();
            res.status(200);
            return "OK";
        });
        get("/status", (req, res) -> {
            JsonArray ja = new JsonArray();
            for (Transfer t : uploads.values())
                ja.add(t.toJSON());
            res.header("Content-Type", "application/json");
            return ja.toString();
        });
        post("/xfer", (req, res) -> {
            return sendBody(req, res, null);
        });
        post("/send", (req, res) -> {
           return sendBody(req, res, req.queryParams("body"));
        });
        awaitInitialization();
        t.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                for (var i = uploads.entrySet().iterator(); i.hasNext(); ) {
                    var e = i.next();
                    if (e.getValue().finished && (e.getValue().finishedAT + 30000 < System.currentTimeMillis())) {
                        i.remove();
                        logger.info("Removed finished transfer {}", e.getValue().id);
                    }
                }
            }
        }, 1000, 1000);

        SDNotify.sendNotify(); //notify: ready
        logger.info("Running");
    }

    private String sendBody(Request req, Response res, String body) {
        try {
            Transfer t = new Transfer(nextID++);
            t.body=body;
            t.from = req.queryParams("from");
            t.to = req.queryParams("to");
            t.toMethod = req.queryParamOrDefault("toMethod", "POST");
            t.cpeeCallback = req.headers("CPEE-CALLBACK");
            t.cpeeCallbackId = req.headers("CPEE-CALLBACK-ID");
            t.cpeeInstanceURL = req.headers("CPEE-INSTANCE-URL");
            if (Boolean.valueOf(req.queryParams("callback"))) {
                res.header("CPEE-CALLBACK", "true");
                t.doCpeeCallback = true;
            }
            LoadTools.startTransfer(t);
            uploads.put(t.id, t);
            res.status(200);
            return "OK: " + t.id;
        } catch (Exception e) {
            return "FAILED: " + e.toString();
        }
    }
}