/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.android.vending.expansion.downloader.impl;
import com.google.android.vending.expansion.downloader.Constants;
import com.google.android.vending.expansion.downloader.Helpers;
import com.google.android.vending.expansion.downloader.IDownloaderClient;
import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRouteParams;
import android.content.Context;
import android.net.Proxy;
import android.os.PowerManager;
import android.os.Process;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.SyncFailedException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Locale;
/**
* Runs an actual download
*/
public class DownloadThread {
private Context mContext;
private DownloadInfo mInfo;
private DownloaderService mService;
private final DownloadsDB mDB;
private final DownloadNotification mNotification;
private String mUserAgent;
public DownloadThread(DownloadInfo info, DownloaderService service,
DownloadNotification notification) {
mContext = service;
mInfo = info;
mService = service;
mNotification = notification;
mDB = DownloadsDB.getDB(service);
mUserAgent = "APKXDL (Linux; U; Android " + android.os.Build.VERSION.RELEASE + ";"
+ Locale.getDefault().toString() + "; " + android.os.Build.DEVICE + "/"
+ android.os.Build.ID + ")" +
service.getPackageName();
}
/**
* Returns the default user agent
*/
private String userAgent() {
return mUserAgent;
}
/**
* State for the entire run() method.
*/
private static class State {
public String mFilename;
public FileOutputStream mStream;
public boolean mCountRetry = false;
public int mRetryAfter = 0;
public int mRedirectCount = 0;
public String mNewUri;
public boolean mGotData = false;
public String mRequestUri;
public State(DownloadInfo info, DownloaderService service) {
mRedirectCount = info.mRedirectCount;
mRequestUri = info.mUri;
mFilename = service.generateTempSaveFileName(info.mFileName);
}
}
/**
* State within executeDownload()
*/
private static class InnerState {
public int mBytesSoFar = 0;
public int mBytesThisSession = 0;
public String mHeaderETag;
public boolean mContinuingDownload = false;
public String mHeaderContentLength;
public String mHeaderContentDisposition;
public String mHeaderContentLocation;
public int mBytesNotified = 0;
public long mTimeLastNotification = 0;
}
/**
* Raised from methods called by run() to indicate that the current request
* should be stopped immediately. Note the message passed to this exception
* will be logged and therefore must be guaranteed not to contain any PII,
* meaning it generally can't include any information about the request URI,
* headers, or destination filename.
*/
private class StopRequest extends Throwable {
/**
*
*/
private static final long serialVersionUID = 6338592678988347973L;
public int mFinalStatus;
public StopRequest(int finalStatus, String message) {
super(message);
mFinalStatus = finalStatus;
}
public StopRequest(int finalStatus, String message, Throwable throwable) {
super(message, throwable);
mFinalStatus = finalStatus;
}
}
/**
* Raised from methods called by executeDownload() to indicate that the
* download should be retried immediately.
*/
private class RetryDownload extends Throwable {
/**
*
*/
private static final long serialVersionUID = 6196036036517540229L;
}
/**
* Returns the preferred proxy to be used by clients. This is a wrapper
* around {@link android.net.Proxy#getHost()}. Currently no proxy will be
* returned for localhost or if the active network is Wi-Fi.
*
* @param context the context which will be passed to
* {@link android.net.Proxy#getHost()}
* @param url the target URL for the request
* @note Calling this method requires permission
* android.permission.ACCESS_NETWORK_STATE
* @return The preferred proxy to be used by clients, or null if there is no
* proxy.
*/
public HttpHost getPreferredHttpHost(Context context,
String url) {
if (!isLocalHost(url) && !mService.isWiFi()) {
final String proxyHost = Proxy.getHost(context);
if (proxyHost != null) {
return new HttpHost(proxyHost, Proxy.getPort(context), "http");
}
}
return null;
}
static final private boolean isLocalHost(String url) {
if (url == null) {
return false;
}
try {
final URI uri = URI.create(url);
final String host = uri.getHost();
if (host != null) {
// TODO: InetAddress.isLoopbackAddress should be used to check
// for localhost. However no public factory methods exist which
// can be used without triggering DNS lookup if host is not
// localhost.
if (host.equalsIgnoreCase("localhost") ||
host.equals("127.0.0.1") ||
host.equals("[::1]")) {
return true;
}
}
} catch (IllegalArgumentException iex) {
// Ignore (URI.create)
}
return false;
}
/**
* Executes the download in a separate thread
*/
public void run() {
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
State state = new State(mInfo, mService);
AndroidHttpClient client = null;
PowerManager.WakeLock wakeLock = null;
int finalStatus = DownloaderService.STATUS_UNKNOWN_ERROR;
try {
PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, Constants.TAG);
wakeLock.acquire();
if (Constants.LOGV) {
Log.v(Constants.TAG, "initiating download for " + mInfo.mFileName);
Log.v(Constants.TAG, " at " + mInfo.mUri);
}
client = AndroidHttpClient.newInstance(userAgent(), mContext);
boolean finished = false;
while (!finished) {
if (Constants.LOGV) {
Log.v(Constants.TAG, "initiating download for " + mInfo.mFileName);
Log.v(Constants.TAG, " at " + mInfo.mUri);
}
// Set or unset proxy, which may have changed since last GET
// request.
// setDefaultProxy() supports null as proxy parameter.
ConnRouteParams.setDefaultProxy(client.getParams(),
getPreferredHttpHost(mContext, state.mRequestUri));
HttpGet request = new HttpGet(state.mRequestUri);
try {
executeDownload(state, client, request);
finished = true;
} catch (RetryDownload exc) {
// fall through
} finally {
request.abort();
request = null;
}
}
if (Constants.LOGV) {
Log.v(Constants.TAG, "download completed for " + mInfo.mFileName);
Log.v(Constants.TAG, " at " + mInfo.mUri);
}
finalizeDestinationFile(state);
finalStatus = DownloaderService.STATUS_SUCCESS;
} catch (StopRequest error) {
// remove the cause before printing, in case it contains PII
Log.w(Constants.TAG,
"Aborting request for download " + mInfo.mFileName + ": " + error.getMessage());
error.printStackTrace();
finalStatus = error.mFinalStatus;
// fall through to finally block
} catch (Throwable ex) { // sometimes the socket code throws unchecked
// exceptions
Log.w(Constants.TAG, "Exception for " + mInfo.mFileName + ": " + ex);
finalStatus = DownloaderService.STATUS_UNKNOWN_ERROR;
// falls through to the code that reports an error
} finally {
if (wakeLock != null) {
wakeLock.release();
wakeLock = null;
}
if (client != null) {
client.close();
client = null;
}
cleanupDestination(state, finalStatus);
notifyDownloadCompleted(finalStatus, state.mCountRetry, state.mRetryAfter,
state.mRedirectCount, state.mGotData, state.mFilename);
}
}
/**
* Fully execute a single download request - setup and send the request,
* handle the response, and transfer the data to the destination file.
*/
private void executeDownload(State state, AndroidHttpClient client, HttpGet request)
throws StopRequest, RetryDownload {
InnerState innerState = new InnerState();
byte data[] = new byte[Constants.BUFFER_SIZE];
checkPausedOrCanceled(state);
setupDestinationFile(state, innerState);
addRequestHeaders(innerState, request);
// check just before sending the request to avoid using an invalid
// connection at all
checkConnectivity(state);
mNotification.onDownloadStateChanged(IDownloaderClient.STATE_CONNECTING);
HttpResponse response = sendRequest(state, client, request);
handleExceptionalStatus(state, innerState, response);
if (Constants.LOGV) {
Log.v(Constants.TAG, "received response for " + mInfo.mUri);
}
processResponseHeaders(state, innerState, response);
InputStream entityStream = openResponseEntity(state, response);
mNotification.onDownloadStateChanged(IDownloaderClient.STATE_DOWNLOADING);
transferData(state, innerState, data, entityStream);
}
/**
* Check if current connectivity is valid for this request.
*/
private void checkConnectivity(State state) throws StopRequest {
switch (mService.getNetworkAvailabilityState(mDB)) {
case DownloaderService.NETWORK_OK:
return;
case DownloaderService.NETWORK_NO_CONNECTION:
throw new StopRequest(DownloaderService.STATUS_WAITING_FOR_NETWORK,
"waiting for network to return");
case DownloaderService.NETWORK_TYPE_DISALLOWED_BY_REQUESTOR:
throw new StopRequest(
DownloaderService.STATUS_QUEUED_FOR_WIFI_OR_CELLULAR_PERMISSION,
"waiting for wifi or for download over cellular to be authorized");
case DownloaderService.NETWORK_CANNOT_USE_ROAMING:
throw new StopRequest(DownloaderService.STATUS_WAITING_FOR_NETWORK,
"roaming is not allowed");
case DownloaderService.NETWORK_UNUSABLE_DUE_TO_SIZE:
throw new StopRequest(DownloaderService.STATUS_QUEUED_FOR_WIFI, "waiting for wifi");
}
}
/**
* Transfer as much data as possible from the HTTP response to the
* destination file.
*
* @param data buffer to use to read data
* @param entityStream stream for reading the HTTP response entity
*/
private void transferData(State state, InnerState innerState, byte[] data,
InputStream entityStream) throws StopRequest {
for (;;) {
int bytesRead = readFromResponse(state, innerState, data, entityStream);
if (bytesRead == -1) { // success, end of stream already reached
handleEndOfStream(state, innerState);
return;
}
state.mGotData = true;
writeDataToDestination(state, data, bytesRead);
innerState.mBytesSoFar += bytesRead;
innerState.mBytesThisSession += bytesRead;
reportProgress(state, innerState);
checkPausedOrCanceled(state);
}
}
/**
* Called after a successful completion to take any necessary action on the
* downloaded file.
*/
private void finalizeDestinationFile(State state) throws StopRequest {
syncDestination(state);
String tempFilename = state.mFilename;
String finalFilename = Helpers.generateSaveFileName(mService, mInfo.mFileName);
if (!state.mFilename.equals(finalFilename)) {
File startFile = new File(tempFilename);
File destFile = new File(finalFilename);
if (mInfo.mTotalBytes != -1 && mInfo.mCurrentBytes == mInfo.mTotalBytes) {
if (!startFile.renameTo(destFile)) {
throw new StopRequest(DownloaderService.STATUS_FILE_ERROR,
"unable to finalize destination file");
}
} else {
throw new StopRequest(DownloaderService.STATUS_FILE_DELIVERED_INCORRECTLY,
"file delivered with incorrect size. probably due to network not browser configured");
}
}
}
/**
* Called just before the thread finishes, regardless of status, to take any
* necessary action on the downloaded file.
*/
private void cleanupDestination(State state, int finalStatus) {
closeDestination(state);
if (state.mFilename != null && DownloaderService.isStatusError(finalStatus)) {
new File(state.mFilename).delete();
state.mFilename = null;
}
}
/**
* Sync the destination file to storage.
*/
private void syncDestination(State state) {
FileOutputStream downloadedFileStream = null;
try {
downloadedFileStream = new FileOutputStream(state.mFilename, true);
downloadedFileStream.getFD().sync();
} catch (FileNotFoundException ex) {
Log.w(Constants.TAG, "file " + state.mFilename + " not found: " + ex);
} catch (SyncFailedException ex) {
Log.w(Constants.TAG, "file " + state.mFilename + " sync failed: " + ex);
} catch (IOException ex) {
Log.w(Constants.TAG, "IOException trying to sync " + state.mFilename + ": " + ex);
} catch (RuntimeException ex) {
Log.w(Constants.TAG, "exception while syncing file: ", ex);
} finally {
if (downloadedFileStream != null) {
try {
downloadedFileStream.close();
} catch (IOException ex) {
Log.w(Constants.TAG, "IOException while closing synced file: ", ex);
} catch (RuntimeException ex) {
Log.w(Constants.TAG, "exception while closing file: ", ex);
}
}
}
}
/**
* Close the destination output stream.
*/
private void closeDestination(State state) {
try {
// close the file
if (state.mStream != null) {
state.mStream.close();
state.mStream = null;
}
} catch (IOException ex) {
if (Constants.LOGV) {
Log.v(Constants.TAG, "exception when closing the file after download : " + ex);
}
// nothing can really be done if the file can't be closed
}
}
/**
* Check if the download has been paused or canceled, stopping the request
* appropriately if it has been.
*/
private void checkPausedOrCanceled(State state) throws StopRequest {
if (mService.getControl() == DownloaderService.CONTROL_PAUSED) {
int status = mService.getStatus();
switch (status) {
case DownloaderService.STATUS_PAUSED_BY_APP:
throw new StopRequest(mService.getStatus(),
"download paused");
}
}
}
/**
* Report download progress through the database if necessary.
*/
private void reportProgress(State state, InnerState innerState) {
long now = System.currentTimeMillis();
if (innerState.mBytesSoFar - innerState.mBytesNotified
> Constants.MIN_PROGRESS_STEP
&& now - innerState.mTimeLastNotification
> Constants.MIN_PROGRESS_TIME) {
// we store progress updates to the database here
mInfo.mCurrentBytes = innerState.mBytesSoFar;
mDB.updateDownloadCurrentBytes(mInfo);
innerState.mBytesNotified = innerState.mBytesSoFar;
innerState.mTimeLastNotification = now;
long totalBytesSoFar = innerState.mBytesThisSession + mService.mBytesSoFar;
if (Constants.LOGVV) {
Log.v(Constants.TAG, "downloaded " + mInfo.mCurrentBytes + " out of "
+ mInfo.mTotalBytes);
Log.v(Constants.TAG, " total " + totalBytesSoFar + " out of "
+ mService.mTotalLength);
}
mService.notifyUpdateBytes(totalBytesSoFar);
}
}
/**
* Write a data buffer to the destination file.
*
* @param data buffer containing the data to write
* @param bytesRead how many bytes to write from the buffer
*/
private void writeDataToDestination(State state, byte[] data, int bytesRead)
throws StopRequest {
for (;;) {
try {
if (state.mStream == null) {
state.mStream = new FileOutputStream(state.mFilename, true);
}
state.mStream.write(data, 0, bytesRead);
// we close after every write --- this may be too inefficient
closeDestination(state);
return;
} catch (IOException ex) {
if (!Helpers.isExternalMediaMounted()) {
throw new StopRequest(DownloaderService.STATUS_DEVICE_NOT_FOUND_ERROR,
"external media not mounted while writing destination file");
}
long availableBytes =
Helpers.getAvailableBytes(Helpers.getFilesystemRoot(state.mFilename));
if (availableBytes < bytesRead) {
throw new StopRequest(DownloaderService.STATUS_INSUFFICIENT_SPACE_ERROR,
"insufficient space while writing destination file", ex);
}
throw new StopRequest(DownloaderService.STATUS_FILE_ERROR,
"while writing destination file: " + ex.toString(), ex);
}
}
}
/**
* Called when we've reached the end of the HTTP response stream, to update
* the database and check for consistency.
*/
private void handleEndOfStream(State state, InnerState innerState) throws StopRequest {
mInfo.mCurrentBytes = innerState.mBytesSoFar;
// this should always be set from the market
// if ( innerState.mHeaderContentLength == null ) {
// mInfo.mTotalBytes = innerState.mBytesSoFar;
// }
mDB.updateDownload(mInfo);
boolean lengthMismatched = (innerState.mHeaderContentLength != null)
&& (innerState.mBytesSoFar != Integer.parseInt(innerState.mHeaderContentLength));
if (lengthMismatched) {
if (cannotResume(innerState)) {
throw new StopRequest(DownloaderService.STATUS_CANNOT_RESUME,
"mismatched content length");
} else {
throw new StopRequest(getFinalStatusForHttpError(state),
"closed socket before end of file");
}
}
}
private boolean cannotResume(InnerState innerState) {
return innerState.mBytesSoFar > 0 && innerState.mHeaderETag == null;
}
/**
* Read some data from the HTTP response stream, handling I/O errors.
*
* @param data buffer to use to read data
* @param entityStream stream for reading the HTTP response entity
* @return the number of bytes actually read or -1 if the end of the stream
* has been reached
*/
private int readFromResponse(State state, InnerState innerState, byte[] data,
InputStream entityStream) throws StopRequest {
try {
return entityStream.read(data);
} catch (IOException ex) {
logNetworkState();
mInfo.mCurrentBytes = innerState.mBytesSoFar;
mDB.updateDownload(mInfo);
if (cannotResume(innerState)) {
String message = "while reading response: " + ex.toString()
+ ", can't resume interrupted download with no ETag";
throw new StopRequest(DownloaderService.STATUS_CANNOT_RESUME,
message, ex);
} else {
throw new StopRequest(getFinalStatusForHttpError(state),
"while reading response: " + ex.toString(), ex);
}
}
}
/**
* Open a stream for the HTTP response entity, handling I/O errors.
*
* @return an InputStream to read the response entity
*/
private InputStream openResponseEntity(State state, HttpResponse response)
throws StopRequest {
try {
return response.getEntity().getContent();
} catch (IOException ex) {
logNetworkState();
throw new StopRequest(getFinalStatusForHttpError(state),
"while getting entity: " + ex.toString(), ex);
}
}
private void logNetworkState() {
if (Constants.LOGX) {
Log.i(Constants.TAG,
"Net "
+ (mService.getNetworkAvailabilityState(mDB) == DownloaderService.NETWORK_OK ? "Up"
: "Down"));
}
}
/**
* Read HTTP response headers and take appropriate action, including setting
* up the destination file and updating the database.
*/
private void processResponseHeaders(State state, InnerState innerState, HttpResponse response)
throws StopRequest {
if (innerState.mContinuingDownload) {
// ignore response headers on resume requests
return;
}
readResponseHeaders(state, innerState, response);
try {
state.mFilename = mService.generateSaveFile(mInfo.mFileName, mInfo.mTotalBytes);
} catch (DownloaderService.GenerateSaveFileError exc) {
throw new StopRequest(exc.mStatus, exc.mMessage);
}
try {
state.mStream = new FileOutputStream(state.mFilename);
} catch (FileNotFoundException exc) {
// make sure the directory exists
File pathFile = new File(Helpers.getSaveFilePath(mService));
try {
if (pathFile.mkdirs()) {
state.mStream = new FileOutputStream(state.mFilename);
}
} catch (Exception ex) {
throw new StopRequest(DownloaderService.STATUS_FILE_ERROR,
"while opening destination file: " + exc.toString(), exc);
}
}
if (Constants.LOGV) {
Log.v(Constants.TAG, "writing " + mInfo.mUri + " to " + state.mFilename);
}
updateDatabaseFromHeaders(state, innerState);
// check connectivity again now that we know the total size
checkConnectivity(state);
}
/**
* Update necessary database fields based on values of HTTP response headers
* that have been read.
*/
private void updateDatabaseFromHeaders(State state, InnerState innerState) {
mInfo.mETag = innerState.mHeaderETag;
mDB.updateDownload(mInfo);
}
/**
* Read headers from the HTTP response and store them into local state.
*/
private void readResponseHeaders(State state, InnerState innerState, HttpResponse response)
throws StopRequest {
Header header = response.getFirstHeader("Content-Disposition");
if (header != null) {
innerState.mHeaderContentDisposition = header.getValue();
}
header = response.getFirstHeader("Content-Location");
if (header != null) {
innerState.mHeaderContentLocation = header.getValue();
}
header = response.getFirstHeader("ETag");
if (header != null) {
innerState.mHeaderETag = header.getValue();
}
String headerTransferEncoding = null;
header = response.getFirstHeader("Transfer-Encoding");
if (header != null) {
headerTransferEncoding = header.getValue();
}
String headerContentType = null;
header = response.getFirstHeader("Content-Type");
if (header != null) {
headerContentType = header.getValue();
if (!headerContentType.equals("application/vnd.android.obb")) {
throw new StopRequest(DownloaderService.STATUS_FILE_DELIVERED_INCORRECTLY,
"file delivered with incorrect Mime type");
}
}
if (headerTransferEncoding == null) {
header = response.getFirstHeader("Content-Length");
if (header != null) {
innerState.mHeaderContentLength = header.getValue();
// this is always set from Market
long contentLength = Long.parseLong(innerState.mHeaderContentLength);
if (contentLength != -1 && contentLength != mInfo.mTotalBytes) {
// we're most likely on a bad wifi connection -- we should
// probably
// also look at the mime type --- but the size mismatch is
// enough
// to tell us that something is wrong here
Log.e(Constants.TAG, "Incorrect file size delivered.");
}
}
} else {
// Ignore content-length with transfer-encoding - 2616 4.4 3
if (Constants.LOGVV) {
Log.v(Constants.TAG,
"ignoring content-length because of xfer-encoding");
}
}
if (Constants.LOGVV) {
Log.v(Constants.TAG, "Content-Disposition: " +
innerState.mHeaderContentDisposition);
Log.v(Constants.TAG, "Content-Length: " + innerState.mHeaderContentLength);
Log.v(Constants.TAG, "Content-Location: " + innerState.mHeaderContentLocation);
Log.v(Constants.TAG, "ETag: " + innerState.mHeaderETag);
Log.v(Constants.TAG, "Transfer-Encoding: " + headerTransferEncoding);
}
boolean noSizeInfo = innerState.mHeaderContentLength == null
&& (headerTransferEncoding == null
|| !headerTransferEncoding.equalsIgnoreCase("chunked"));
if (noSizeInfo) {
throw new StopRequest(DownloaderService.STATUS_HTTP_DATA_ERROR,
"can't know size of download, giving up");
}
}
/**
* Check the HTTP response status and handle anything unusual (e.g. not
* 200/206).
*/
private void handleExceptionalStatus(State state, InnerState innerState, HttpResponse response)
throws StopRequest, RetryDownload {
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 503 && mInfo.mNumFailed < Constants.MAX_RETRIES) {
handleServiceUnavailable(state, response);
}
if (statusCode == 301 || statusCode == 302 || statusCode == 303 || statusCode == 307) {
handleRedirect(state, response, statusCode);
}
int expectedStatus = innerState.mContinuingDownload ? 206
: DownloaderService.STATUS_SUCCESS;
if (statusCode != expectedStatus) {
handleOtherStatus(state, innerState, statusCode);
} else {
// no longer redirected
state.mRedirectCount = 0;
}
}
/**
* Handle a status that we don't know how to deal with properly.
*/
private void handleOtherStatus(State state, InnerState innerState, int statusCode)
throws StopRequest {
int finalStatus;
if (DownloaderService.isStatusError(statusCode)) {
finalStatus = statusCode;
} else if (statusCode >= 300 && statusCode < 400) {
finalStatus = DownloaderService.STATUS_UNHANDLED_REDIRECT;
} else if (innerState.mContinuingDownload && statusCode == DownloaderService.STATUS_SUCCESS) {
finalStatus = DownloaderService.STATUS_CANNOT_RESUME;
} else {
finalStatus = DownloaderService.STATUS_UNHANDLED_HTTP_CODE;
}
throw new StopRequest(finalStatus, "http error " + statusCode);
}
/**
* Handle a 3xx redirect status.
*/
private void handleRedirect(State state, HttpResponse response, int statusCode)
throws StopRequest, RetryDownload {
if (Constants.LOGVV) {
Log.v(Constants.TAG, "got HTTP redirect " + statusCode);
}
if (state.mRedirectCount >= Constants.MAX_REDIRECTS) {
throw new StopRequest(DownloaderService.STATUS_TOO_MANY_REDIRECTS, "too many redirects");
}
Header header = response.getFirstHeader("Location");
if (header == null) {
return;
}
if (Constants.LOGVV) {
Log.v(Constants.TAG, "Location :" + header.getValue());
}
String newUri;
try {
newUri = new URI(mInfo.mUri).resolve(new URI(header.getValue())).toString();
} catch (URISyntaxException ex) {
if (Constants.LOGV) {
Log.d(Constants.TAG, "Couldn't resolve redirect URI " + header.getValue()
+ " for " + mInfo.mUri);
}
throw new StopRequest(DownloaderService.STATUS_HTTP_DATA_ERROR,
"Couldn't resolve redirect URI");
}
++state.mRedirectCount;
state.mRequestUri = newUri;
if (statusCode == 301 || statusCode == 303) {
// use the new URI for all future requests (should a retry/resume be
// necessary)
state.mNewUri = newUri;
}
throw new RetryDownload();
}
/**
* Add headers for this download to the HTTP request to allow for resume.
*/
private void addRequestHeaders(InnerState innerState, HttpGet request) {
if (innerState.mContinuingDownload) {
if (innerState.mHeaderETag != null) {
request.addHeader("If-Match", innerState.mHeaderETag);
}
request.addHeader("Range", "bytes=" + innerState.mBytesSoFar + "-");
}
}
/**
* Handle a 503 Service Unavailable status by processing the Retry-After
* header.
*/
private void handleServiceUnavailable(State state, HttpResponse response) throws StopRequest {
if (Constants.LOGVV) {
Log.v(Constants.TAG, "got HTTP response code 503");
}
state.mCountRetry = true;
Header header = response.getFirstHeader("Retry-After");
if (header != null) {
try {
if (Constants.LOGVV) {
Log.v(Constants.TAG, "Retry-After :" + header.getValue());
}
state.mRetryAfter = Integer.parseInt(header.getValue());
if (state.mRetryAfter < 0) {
state.mRetryAfter = 0;
} else {
if (state.mRetryAfter < Constants.MIN_RETRY_AFTER) {
state.mRetryAfter = Constants.MIN_RETRY_AFTER;
} else if (state.mRetryAfter > Constants.MAX_RETRY_AFTER) {
state.mRetryAfter = Constants.MAX_RETRY_AFTER;
}
state.mRetryAfter += Helpers.sRandom.nextInt(Constants.MIN_RETRY_AFTER + 1);
state.mRetryAfter *= 1000;
}
} catch (NumberFormatException ex) {
// ignored - retryAfter stays 0 in this case.
}
}
throw new StopRequest(DownloaderService.STATUS_WAITING_TO_RETRY,
"got 503 Service Unavailable, will retry later");
}
/**
* Send the request to the server, handling any I/O exceptions.
*/
private HttpResponse sendRequest(State state, AndroidHttpClient client, HttpGet request)
throws StopRequest {
try {
return client.execute(request);
} catch (IllegalArgumentException ex) {
throw new StopRequest(DownloaderService.STATUS_HTTP_DATA_ERROR,
"while trying to execute request: " + ex.toString(), ex);
} catch (IOException ex) {
logNetworkState();
throw new StopRequest(getFinalStatusForHttpError(state),
"while trying to execute request: " + ex.toString(), ex);
}
}
private int getFinalStatusForHttpError(State state) {
if (mService.getNetworkAvailabilityState(mDB) != DownloaderService.NETWORK_OK) {
return DownloaderService.STATUS_WAITING_FOR_NETWORK;
} else if (mInfo.mNumFailed < Constants.MAX_RETRIES) {
state.mCountRetry = true;
return DownloaderService.STATUS_WAITING_TO_RETRY;
} else {
Log.w(Constants.TAG, "reached max retries for " + mInfo.mNumFailed);
return DownloaderService.STATUS_HTTP_DATA_ERROR;
}
}
/**
* Prepare the destination file to receive data. If the file already exists,
* we'll set up appropriately for resumption.
*/
private void setupDestinationFile(State state, InnerState innerState)
throws StopRequest {
if (state.mFilename != null) { // only true if we've already run a
// thread for this download
if (!Helpers.isFilenameValid(state.mFilename)) {
// this should never happen
throw new StopRequest(DownloaderService.STATUS_FILE_ERROR,
"found invalid internal destination filename");
}
// We're resuming a download that got interrupted
File f = new File(state.mFilename);
if (f.exists()) {
long fileLength = f.length();
if (fileLength == 0) {
// The download hadn't actually started, we can restart from
// scratch
f.delete();
state.mFilename = null;
} else if (mInfo.mETag == null) {
// This should've been caught upon failure
f.delete();
throw new StopRequest(DownloaderService.STATUS_CANNOT_RESUME,
"Trying to resume a download that can't be resumed");
} else {
// All right, we'll be able to resume this download
try {
state.mStream = new FileOutputStream(state.mFilename, true);
} catch (FileNotFoundException exc) {
throw new StopRequest(DownloaderService.STATUS_FILE_ERROR,
"while opening destination for resuming: " + exc.toString(), exc);
}
innerState.mBytesSoFar = (int) fileLength;
if (mInfo.mTotalBytes != -1) {
innerState.mHeaderContentLength = Long.toString(mInfo.mTotalBytes);
}
innerState.mHeaderETag = mInfo.mETag;
innerState.mContinuingDownload = true;
}
}
}
if (state.mStream != null) {
closeDestination(state);
}
}
/**
* Stores information about the completed download, and notifies the
* initiating application.
*/
private void notifyDownloadCompleted(
int status, boolean countRetry, int retryAfter, int redirectCount, boolean gotData,
String filename) {
updateDownloadDatabase(
status, countRetry, retryAfter, redirectCount, gotData, filename);
if (DownloaderService.isStatusCompleted(status)) {
// TBD: send status update?
}
}
private void updateDownloadDatabase(
int status, boolean countRetry, int retryAfter, int redirectCount, boolean gotData,
String filename) {
mInfo.mStatus = status;
mInfo.mRetryAfter = retryAfter;
mInfo.mRedirectCount = redirectCount;
mInfo.mLastMod = System.currentTimeMillis();
if (!countRetry) {
mInfo.mNumFailed = 0;
} else if (gotData) {
mInfo.mNumFailed = 1;
} else {
mInfo.mNumFailed++;
}
mDB.updateDownload(mInfo);
}
}