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AssetBundleManager.java
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AssetBundleManager.java
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package com.meteor.webapp;
import android.net.Uri;
import android.util.Log;
import org.apache.cordova.CordovaResourceApi;
import org.json.JSONException;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import okhttp3.Call;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
class AssetBundleManager {
private static final String LOG_TAG = "MeteorWebApp";
public interface Callback {
public boolean shouldDownloadBundleForManifest(AssetManifest manifest);
public void onFinishedDownloadingAssetBundle(AssetBundle assetBundle);
public void onError(Throwable cause);
}
private Callback callback;
private final CordovaResourceApi resourceApi;
private final WebAppConfiguration webAppConfiguration;
private final OkHttpClient httpClient;
/** The directory used to store downloaded asset bundles */
private final File versionsDirectory;
private final Map<String, AssetBundle> downloadedAssetBundlesByVersion;
/** The directory used while downloading a new asset bundle */
private final File downloadDirectory;
private final File partialDownloadDirectory;
private AssetBundle partiallyDownloadedAssetBundle;
private AssetBundleDownloader assetBundleDownloader;
/** The initial asset bundle included in the app bundle */
public final AssetBundle initialAssetBundle;
public AssetBundleManager(CordovaResourceApi resourceApi, WebAppConfiguration webAppConfiguration, AssetBundle initialAssetBundle, File versionsDirectory) throws WebAppException {
this.resourceApi = resourceApi;
this.webAppConfiguration = webAppConfiguration;
this.initialAssetBundle = initialAssetBundle;
this.versionsDirectory = versionsDirectory;
downloadDirectory = new File(versionsDirectory, "Downloading");
partialDownloadDirectory = new File(versionsDirectory, "PartialDownload");
downloadedAssetBundlesByVersion = new HashMap<String, AssetBundle>();
loadDownloadedAssetBundles();
httpClient = new OkHttpClient();
}
private void loadDownloadedAssetBundles() throws WebAppException {
for (File file: versionsDirectory.listFiles()) {
if (downloadDirectory.equals(file)) continue;
if (partialDownloadDirectory.equals(file)) continue;
if (file.isDirectory()) {
AssetBundle assetBundle = new AssetBundle(resourceApi, Uri.fromFile(file), null, initialAssetBundle);
downloadedAssetBundlesByVersion.put(assetBundle.getVersion(), assetBundle);
}
}
}
public void setCallback(Callback callback) {
this.callback = callback;
}
synchronized public AssetBundle downloadedAssetBundleWithVersion(String version) {
return downloadedAssetBundlesByVersion.get(version);
}
public void checkForUpdates(final HttpUrl baseUrl) {
HttpUrl manifestUrl = baseUrl.newBuilder().addPathSegment("manifest.json").build();
Request request = new Request.Builder().url(manifestUrl).build();
httpClient.newCall(request).enqueue(new okhttp3.Callback() {
@Override
public void onFailure(Call call, IOException e) {
if (!call.isCanceled()) {
didFail(new WebAppException("Error downloading asset manifest", e));
}
}
@Override
public void onResponse(Call call, Response response) {
if (!response.isSuccessful()) {
didFail(new WebAppException("Non-success status code " + response.code() + "for asset manifest"));
return;
}
byte[] manifestBytes;
AssetManifest manifest;
try {
manifestBytes = response.body().bytes();
manifest = new AssetManifest(new String(manifestBytes));
} catch (WebAppException e) {
didFail(e);
return;
} catch (IOException e) {
didFail(e);
return;
}
final String version = manifest.version;
Log.d(LOG_TAG, "Downloaded asset manifest for version: " + version);
if (assetBundleDownloader != null && assetBundleDownloader.getAssetBundle().getVersion().equals(version)) {
Log.w(LOG_TAG, "Already downloading asset bundle version: " + version);
return;
}
// Give the callback a chance to decide whether the version should be downloaded
if (callback != null && !callback.shouldDownloadBundleForManifest(manifest)) {
return;
}
// Cancel in progress download if there is one
if (assetBundleDownloader != null) {
assetBundleDownloader.cancel();
}
assetBundleDownloader = null;
// There is no need to redownload the initial version
if (initialAssetBundle.getVersion().equals(version)) {
didFinishDownloadingAssetBundle(initialAssetBundle);
return;
}
// If there is a previously downloaded asset bundle with the requested
// version, use that
AssetBundle downloadedAssetBundle = downloadedAssetBundleWithVersion(version);
if (downloadedAssetBundle != null) {
didFinishDownloadingAssetBundle(downloadedAssetBundle);
return;
}
// Else, get ready to download the new asset bundle
moveExistingDownloadDirectoryIfNeeded();
// Create download directory
if (!downloadDirectory.mkdir()) {
didFail(new IOException("Could not create download directory"));
return;
}
// Copy downloaded asset manifest to file
File manifestFile = new File(downloadDirectory, "program.json");
try {
IOUtils.writeToFile(manifestBytes, manifestFile);
} catch (IOException e) {
didFail(e);
return;
}
AssetBundle assetBundle = null;
try {
assetBundle = new AssetBundle(resourceApi, Uri.fromFile(downloadDirectory), manifest, initialAssetBundle);
} catch (WebAppException e) {
didFail(e);
return;
}
downloadAssetBundle(assetBundle, baseUrl);
}
});
}
/** If there is an existing Downloading directory, move it
* to PartialDownload and load the partiallyDownloadedAssetBundle so we
* don't unnecessarily redownload assets
*/
private void moveExistingDownloadDirectoryIfNeeded() {
if (downloadDirectory.exists()) {
if (partialDownloadDirectory.exists()) {
if (!IOUtils.deleteRecursively(partialDownloadDirectory)) {
Log.w(LOG_TAG, "Could not delete partial download directory");
}
}
partiallyDownloadedAssetBundle = null;
if (!downloadDirectory.renameTo(partialDownloadDirectory)) {
Log.w(LOG_TAG, "Could not rename existing download directory");
return;
}
try {
partiallyDownloadedAssetBundle = new AssetBundle(resourceApi, Uri.fromFile(partialDownloadDirectory), initialAssetBundle);
} catch (Exception e) {
Log.w(LOG_TAG, "Could not load partially downloaded asset bundle", e);
}
}
}
public boolean isDownloading() {
return assetBundleDownloader != null;
}
synchronized protected void downloadAssetBundle(final AssetBundle assetBundle, HttpUrl baseUrl) {
Set<AssetBundle.Asset> missingAssets = new HashSet<AssetBundle.Asset>();
for (AssetBundle.Asset asset : assetBundle.getOwnAssets()) {
// Create containing directories for the asset if necessary
File containingDirectory = asset.getFile().getParentFile();
if (!containingDirectory.exists()) {
if (!containingDirectory.mkdirs()) {
didFail(new IOException("Could not create containing directory: " + containingDirectory));
return;
}
}
// If we find a cached asset, we copy it
AssetBundle.Asset cachedAsset = cachedAssetForAsset(asset);
if (cachedAsset != null) {
try {
resourceApi.copyResource(cachedAsset.getFileUri(), asset.getFileUri());
} catch (IOException e) {
didFail(e);
return;
}
} else {
missingAssets.add(asset);
}
}
// If all assets were cached, there is no need to start a download
if (missingAssets.isEmpty()) {
didFinishDownloadingAssetBundle(assetBundle);
return;
}
assetBundleDownloader = new AssetBundleDownloader(webAppConfiguration, assetBundle, baseUrl, missingAssets);
assetBundleDownloader.setCallback(new AssetBundleDownloader.Callback() {
@Override
public void onFinished() {
assetBundleDownloader = null;
moveDownloadedAssetBundleIntoPlace(assetBundle);
didFinishDownloadingAssetBundle(assetBundle);
}
@Override
public void onFailure(Throwable cause) {
didFail(cause);
}
});
assetBundleDownloader.resume();
}
protected void didFinishDownloadingAssetBundle(AssetBundle assetBundle) {
assetBundleDownloader = null;
if (callback != null) {
callback.onFinishedDownloadingAssetBundle(assetBundle);
}
}
protected void didFail(Throwable cause) {
assetBundleDownloader = null;
if (callback != null) {
callback.onError(cause);
}
}
protected AssetBundle.Asset cachedAssetForAsset(AssetBundle.Asset asset) {
for (AssetBundle assetBundle : downloadedAssetBundlesByVersion.values()) {
AssetBundle.Asset cachedAsset = assetBundle.cachedAssetForUrlPath(asset.urlPath, asset.hash);
if (cachedAsset != null) {
return cachedAsset;
}
}
if (partiallyDownloadedAssetBundle != null) {
AssetBundle.Asset cachedAsset = partiallyDownloadedAssetBundle.cachedAssetForUrlPath(asset.urlPath, asset.hash);
// Make sure the asset has been downloaded
if (cachedAsset != null && cachedAsset.getFile().exists()) {
return cachedAsset;
}
}
return null;
}
/** Move the downloaded asset bundle to a new directory named after the version */
synchronized protected void moveDownloadedAssetBundleIntoPlace(AssetBundle assetBundle) {
final String version = assetBundle.getVersion();
File versionDirectory = new File(versionsDirectory, version);
downloadDirectory.renameTo(versionDirectory);
assetBundle.didMoveToDirectoryAtUri(Uri.fromFile(versionDirectory));
downloadedAssetBundlesByVersion.put(version, assetBundle);
}
synchronized void removeAllDownloadedAssetBundlesExceptForVersion(String versionToKeep) {
Iterator<AssetBundle> iterator = downloadedAssetBundlesByVersion.values().iterator();
while (iterator.hasNext()) {
AssetBundle assetBundle = iterator.next();
final String version = assetBundle.getVersion();
if (version.equals(versionToKeep)) continue;
File versionDirectory = new File(versionsDirectory, version);
IOUtils.deleteRecursively(versionDirectory);
iterator.remove();
}
}
//region Testing support
File getDownloadDirectory() {
return downloadDirectory;
}
//endregion
}