/*
* SK's Minecraft Launcher
* Copyright (C) 2010-2014 Albert Pham <http://www.sk89q.com> and contributors
* Please see LICENSE.txt for license information.
*/
package com.skcraft.launcher.install;
import com.google.common.base.Charsets;
import com.google.common.base.Strings;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.skcraft.concurrency.ProgressObservable;
import com.skcraft.launcher.util.HttpRequest;
import com.skcraft.launcher.util.SharedLocale;
import lombok.Getter;
import lombok.NonNull;
import lombok.Setter;
import lombok.extern.java.Log;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import static com.skcraft.launcher.util.SharedLocale.tr;
@Log
public class HttpDownloader implements Downloader {
private final Random random = new Random();
private final HashFunction hf = Hashing.sha1();
private final File tempDir;
@Getter @Setter private int threadCount = 6;
@Getter @Setter private int retryDelay = 2000;
@Getter @Setter private int tryCount = 3;
private List<HttpDownloadJob> queue = new ArrayList<HttpDownloadJob>();
private final Set<String> usedKeys = new HashSet<String>();
private final List<HttpDownloadJob> running = new ArrayList<HttpDownloadJob>();
private final List<HttpDownloadJob> failed = new ArrayList<HttpDownloadJob>();
private long downloaded = 0;
private long total = 0;
private int left = 0;
/**
* Create a new downloader using the given executor.
*
* @param tempDir the temporary directory
*/
public HttpDownloader(@NonNull File tempDir) {
this.tempDir = tempDir;
}
/**
* Make sure that we aren't re-using hash IDs.
*
* @param baseKey the key to make unique
* @return a unique key
*/
private String createUniqueKey(String baseKey) {
String key = baseKey;
int i = 0;
while (usedKeys.contains(key)) {
key = baseKey + "_" + (i++);
}
usedKeys.add(key);
return key;
}
@Override
public synchronized File download(@NonNull List<URL> urls, @NonNull String key, long size, String name) {
if (urls.isEmpty()) {
throw new IllegalArgumentException("Can't download empty list of URLs");
}
String hash = hf.hashString(Strings.nullToEmpty(key) + urls.get(0), Charsets.UTF_8).toString();
hash = createUniqueKey(hash);
File tempFile = new File(tempDir, hash.substring(0, 2) + "/" + hash);
// If the file is already downloaded (such as from before), then don't re-download
if (!tempFile.exists()) {
total += size;
left++;
queue.add(new HttpDownloadJob(tempFile, urls, size, name != null ? name : tempFile.getName()));
}
return tempFile;
}
@Override
public File download(URL url, String key, long size, String name) {
List<URL> urls = new ArrayList<URL>();
urls.add(url);
return download(urls, key, size, name);
}
/**
* Prevent further downloads from being queued and download queued files.
*
* @throws InterruptedException thrown on interruption
* @throws IOException thrown on I/O error
*/
public void execute() throws InterruptedException, IOException {
synchronized (this) {
queue = Collections.unmodifiableList(queue);
}
ListeningExecutorService executor = MoreExecutors.listeningDecorator(
Executors.newFixedThreadPool(threadCount));
try {
List<ListenableFuture<?>> futures = new ArrayList<ListenableFuture<?>>();
synchronized (this) {
for (HttpDownloadJob job : queue) {
futures.add(executor.submit(job));
}
}
try {
Futures.allAsList(futures).get();
} catch (ExecutionException e) {
throw new IOException("Something went wrong", e);
}
synchronized (this) {
if (failed.size() > 0) {
throw new IOException(failed.size() + " file(s) could not be downloaded");
}
}
} finally {
executor.shutdownNow();
}
}
@Override
public synchronized double getProgress() {
if (total <= 0) {
return -1;
}
long downloaded = this.downloaded;
for (HttpDownloadJob job : running) {
downloaded += Math.max(0, job.getProgress() * job.size);
}
return downloaded / (double) total;
}
@Override
public synchronized String getStatus() {
String failMessage = tr("downloader.failedCount", failed.size());
if (running.size() == 1) {
return tr("downloader.downloadingItem", running.get(0).getName()) +
"\n" + running.get(0).getStatus() +
"\n" + failMessage;
} else if (running.size() > 0) {
StringBuilder builder = new StringBuilder();
for (HttpDownloadJob job : running) {
builder.append("\n");
builder.append(job.getStatus());
}
return tr("downloader.downloadingList", queue.size(), left, failed.size()) +
builder.toString() +
"\n" + failMessage;
} else {
return SharedLocale.tr("downloader.noDownloads");
}
}
public class HttpDownloadJob implements Runnable, ProgressObservable {
private final File destFile;
private final List<URL> urls;
private final long size;
@Getter private String name;
private HttpRequest request;
private HttpDownloadJob(File destFile, List<URL> urls, long size, String name) {
this.destFile = destFile;
this.urls = urls;
this.size = size;
this.name = name;
}
@Override
public void run() {
try {
synchronized (HttpDownloader.this) {
running.add(this);
}
download();
synchronized (HttpDownloader.this) {
downloaded += size;
}
} catch (IOException e) {
synchronized (HttpDownloader.this) {
failed.add(this);
}
} catch (InterruptedException e) {
log.info("Download of " + destFile + " was interrupted");
} finally {
synchronized (HttpDownloader.this) {
left--;
running.remove(this);
}
}
}
private void download() throws IOException, InterruptedException {
log.log(Level.INFO, "Downloading " + destFile + " from " + urls);
File destDir = destFile.getParentFile();
File tempFile = new File(destDir, destFile.getName() + ".tmp");
destDir.mkdirs();
// Try to download
download(tempFile);
destFile.delete();
if (!tempFile.renameTo(destFile)) {
throw new IOException(String.format("Failed to rename %s to %s", tempFile, destFile));
}
}
private void download(File file) throws IOException, InterruptedException {
int trial = 0;
boolean first = true;
IOException lastException = null;
do {
for (URL url : urls) {
// Sleep between each trial
if (!first) {
Thread.sleep((long) (retryDelay / 2 + (random.nextDouble() * retryDelay)));
}
first = false;
try {
request = HttpRequest.get(url);
request.execute().expectResponseCode(200).saveContent(file);
return;
} catch (IOException e) {
lastException = e;
log.log(Level.WARNING, "Failed to download " + url, e);
}
}
} while (++trial < tryCount);
throw new IOException("Failed to download from " + urls, lastException);
}
@Override
public double getProgress() {
HttpRequest request = this.request;
return request != null ? request.getProgress() : -1;
}
@Override
public String getStatus() {
double progress = getProgress();
if (progress >= 0) {
return tr("downloader.jobProgress", name, Math.round(progress * 100 * 100) / 100.0);
} else {
return tr("downloader.jobPending", name);
}
}
}
}