mirror of
https://github.com/zhigang1992/AndroidVideoCache.git
synced 2026-02-10 08:43:06 +08:00
🎉 VideoCache 1.0 released
This commit is contained in:
Alexey Danilov
@@ -0,0 +1,240 @@
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package com.danikula.videocache;
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import android.net.Uri;
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import android.text.TextUtils;
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import android.util.Log;
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import java.io.BufferedOutputStream;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.net.InetAddress;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* {@link ProxyCache} that uses local server to handle requests and cache data.
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* Typical usage:
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* <pre><code>
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* HttpProxyCache proxy;
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* public onCreate(Bundle state) {
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* super.onCreate(state);
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* ...
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* try{
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* HttpUrlSource source = new HttpUrlSource(YOUR_VIDEO_URI);
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* Cache cache = new FileCache(new File(context.getCacheDir(), "video.mp4"));
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* proxy = new HttpProxyCache(source, cache);
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* videoView.setVideoPath(proxy.getUrl());
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* } catch(ProxyCacheException e) {
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* Log.e(LOG_TAG, "Error playing video", e);
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* }
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* }
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* public onDestroy(){
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* super.onDestroy();
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*
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* if (proxy != null) {
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* proxy.shutdown();
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* }
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* }
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* <code/></pre>
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*
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* @author Alexey Danilov (danikula@gmail.com).
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*/
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public class HttpProxyCache extends ProxyCache {
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private static final int CLIENT_COUNT = 3;
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private static final Pattern RANGE_HEADER_PATTERN = Pattern.compile("[R,r]ange:[ ]?bytes=(\\d*)-");
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private static final String PROXY_HOST = "127.0.0.1";
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private final HttpUrlSource httpUrlSource;
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private final Cache cache;
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private final ServerSocket serverSocket;
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private final int port;
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private final Thread waitConnectionThread;
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private final ExecutorService executorService;
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public HttpProxyCache(HttpUrlSource source, Cache cache, boolean logEnabled) throws ProxyCacheException {
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super(source, cache, logEnabled);
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this.httpUrlSource = source;
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this.cache = cache;
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this.executorService = Executors.newFixedThreadPool(CLIENT_COUNT);
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try {
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InetAddress inetAddress = InetAddress.getByName(PROXY_HOST);
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this.serverSocket = new ServerSocket(0, CLIENT_COUNT, inetAddress);
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this.port = serverSocket.getLocalPort();
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CountDownLatch startSignal = new CountDownLatch(1);
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this.waitConnectionThread = new Thread(new WaitRequestsRunnable(startSignal));
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this.waitConnectionThread.start();
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startSignal.await(); // freeze thread, wait for server starts
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} catch (IOException | InterruptedException e) {
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executorService.shutdown();
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throw new ProxyCacheException("Error starting local server", e);
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}
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}
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public HttpProxyCache(HttpUrlSource source, Cache cache) throws ProxyCacheException {
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this(source, cache, false);
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}
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public String getUrl() {
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return "http://" + PROXY_HOST + ":" + port + Uri.parse(httpUrlSource.url).getPath();
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}
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@Override
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public void shutdown() {
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super.shutdown();
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Log.i(ProxyCacheUtils.LOG_TAG, "Shutdown proxy");
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waitConnectionThread.interrupt();
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try {
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if (!serverSocket.isClosed()) {
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serverSocket.close();
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}
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} catch (IOException e) {
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onError(new ProxyCacheException("Error shutting down local server", e));
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}
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}
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private void waitForRequest() {
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try {
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while (!Thread.currentThread().isInterrupted()) {
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Socket socket = serverSocket.accept();
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Log.d(ProxyCacheUtils.LOG_TAG, "Accept new socket " + socket);
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processSocketInBackground(socket);
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}
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} catch (IOException e) {
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onError(new ProxyCacheException("Error during waiting connection", e));
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}
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}
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private void processSocketInBackground(final Socket socket) throws IOException {
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executorService.submit(new Runnable() {
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@Override
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public void run() {
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try {
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processSocket(socket);
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} catch (Throwable e) {
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onError(e);
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}
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}
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});
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}
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private void processSocket(Socket socket) {
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try {
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InputStream inputStream = socket.getInputStream();
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String request = readRequest(inputStream);
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Log.i(ProxyCacheUtils.LOG_TAG, "Request to cache proxy:\n" + request);
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long rangeOffset = getRangeOffset(request);
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writeResponse(socket, rangeOffset);
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} catch (ProxyCacheException | IOException e) {
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onError(new ProxyCacheException("Error processing request", e));
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} finally {
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releaseSocket(socket);
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}
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}
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private void writeResponse(Socket socket, long rangeOffset) throws ProxyCacheException, IOException {
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OutputStream out = new BufferedOutputStream(socket.getOutputStream());
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byte[] buffer = new byte[ProxyCacheUtils.DEFAULT_BUFFER_SIZE];
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int readBytes;
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long offset = Math.max(rangeOffset, 0);
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boolean headersWrote = false;
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while ((readBytes = read(buffer, offset, buffer.length)) != -1) {
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// tiny optimization: to prevent HEAD request in source for content-length. content-length 'll available after reading source
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if (!headersWrote) {
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writeResponseHeaders(out, rangeOffset);
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headersWrote = true;
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}
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out.write(buffer, 0, readBytes);
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if (isLogEnabled()) {
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Log.d(ProxyCacheUtils.LOG_TAG, "Write data[" + readBytes + " bytes] to socket " + socket + " with offset " + offset + ": " + ProxyCacheUtils.preview(buffer, readBytes));
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}
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offset += readBytes;
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}
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out.flush();
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}
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private void writeResponseHeaders(OutputStream out, long rangeOffset) throws IOException, ProxyCacheException {
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String responseHeaders = newResponseHeaders(rangeOffset);
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out.write(responseHeaders.getBytes("UTF-8"));
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Log.i(ProxyCacheUtils.LOG_TAG, "Response headers:\n" + responseHeaders);
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}
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private String newResponseHeaders(long offset) throws IOException, ProxyCacheException {
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boolean partial = offset >= 0;
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String mime = httpUrlSource.getMime();
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boolean mimeKnown = !TextUtils.isEmpty(mime);
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int length = cache.isCompleted() ? cache.available() : httpUrlSource.available();
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boolean lengthKnown = length >= 0;
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long contentLength = partial ? length - offset : length;
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return new StringBuilder()
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.append(partial ? "HTTP/1.1 206 PARTIAL CONTENT\n" : "HTTP/1.1 200 OK\n")
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.append("Accept-Ranges: bytes\n")
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.append(lengthKnown ? String.format("Content-Length: %d\n", contentLength) : "")
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.append(lengthKnown && partial ? String.format("Content-Range: bytes %d-%d/%d\n", offset, length, length) : "")
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.append(mimeKnown ? String.format("Content-Type: %s\n", mime) : "")
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.append("\n") // headers end
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.toString();
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}
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private String readRequest(InputStream inputStream) throws IOException {
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BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
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StringBuilder str = new StringBuilder();
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String line;
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while (!TextUtils.isEmpty(line = reader.readLine())) { // until new line (headers ending)
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str.append(line).append('\n');
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}
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return str.toString();
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}
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private long getRangeOffset(String request) {
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Matcher matcher = RANGE_HEADER_PATTERN.matcher(request);
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if (matcher.find()) {
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String rangeValue = matcher.group(1);
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return Long.parseLong(rangeValue);
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}
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return -1;
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}
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private void releaseSocket(Socket socket) {
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try {
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socket.shutdownInput();
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} catch (IOException e) {
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onError(new ProxyCacheException("Error closing socket input stream", e));
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}
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try {
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socket.shutdownOutput();
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} catch (IOException e) {
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onError(new ProxyCacheException("Error closing socket output stream", e));
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}
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try {
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socket.close();
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} catch (IOException e) {
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onError(new ProxyCacheException("Error closing socket", e));
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}
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}
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private final class WaitRequestsRunnable implements Runnable {
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private final CountDownLatch startSignal;
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public WaitRequestsRunnable(CountDownLatch startSignal) {
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this.startSignal = startSignal;
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}
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@Override
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public void run() {
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startSignal.countDown();
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waitForRequest();
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}
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}
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}
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