Dianne Hackborn | e17aeb3 | 2011-04-07 15:11:57 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.am; |
| 18 | |
| 19 | import java.io.FileDescriptor; |
| 20 | import java.io.FileInputStream; |
| 21 | import java.io.FileOutputStream; |
| 22 | import java.io.IOException; |
| 23 | |
| 24 | import android.os.Binder; |
| 25 | import android.os.IBinder; |
| 26 | import android.os.IInterface; |
| 27 | import android.os.ParcelFileDescriptor; |
| 28 | import android.os.RemoteException; |
| 29 | import android.os.SystemClock; |
| 30 | import android.util.Slog; |
| 31 | |
| 32 | /** |
| 33 | * Helper for transferring data through a pipe from a client app. |
| 34 | */ |
| 35 | class TransferPipe implements Runnable { |
| 36 | static final String TAG = "TransferPipe"; |
| 37 | static final boolean DEBUG = false; |
| 38 | |
| 39 | static final long DEFAULT_TIMEOUT = 5000; // 5 seconds |
| 40 | |
| 41 | final Thread mThread;; |
| 42 | final ParcelFileDescriptor[] mFds; |
| 43 | |
| 44 | FileDescriptor mOutFd; |
| 45 | long mEndTime; |
| 46 | String mFailure; |
| 47 | boolean mComplete; |
| 48 | |
| 49 | String mBufferPrefix; |
| 50 | |
| 51 | interface Caller { |
| 52 | void go(IInterface iface, FileDescriptor fd, String prefix, |
| 53 | String[] args) throws RemoteException; |
| 54 | } |
| 55 | |
| 56 | TransferPipe() throws IOException { |
| 57 | mThread = new Thread(this, "TransferPipe"); |
| 58 | mFds = ParcelFileDescriptor.createPipe(); |
| 59 | } |
| 60 | |
| 61 | ParcelFileDescriptor getReadFd() { |
| 62 | return mFds[0]; |
| 63 | } |
| 64 | |
| 65 | ParcelFileDescriptor getWriteFd() { |
| 66 | return mFds[1]; |
| 67 | } |
| 68 | |
| 69 | void setBufferPrefix(String prefix) { |
| 70 | mBufferPrefix = prefix; |
| 71 | } |
| 72 | |
| 73 | static void go(Caller caller, IInterface iface, FileDescriptor out, |
| 74 | String prefix, String[] args) throws IOException, RemoteException { |
| 75 | go(caller, iface, out, prefix, args, DEFAULT_TIMEOUT); |
| 76 | } |
| 77 | |
| 78 | static void go(Caller caller, IInterface iface, FileDescriptor out, |
| 79 | String prefix, String[] args, long timeout) throws IOException, RemoteException { |
| 80 | if ((iface.asBinder()) instanceof Binder) { |
| 81 | // This is a local object... just call it directly. |
| 82 | try { |
| 83 | caller.go(iface, out, prefix, args); |
| 84 | } catch (RemoteException e) { |
| 85 | } |
| 86 | return; |
| 87 | } |
| 88 | |
| 89 | TransferPipe tp = new TransferPipe(); |
| 90 | try { |
| 91 | caller.go(iface, tp.getWriteFd().getFileDescriptor(), prefix, args); |
| 92 | tp.go(out, timeout); |
| 93 | } finally { |
| 94 | tp.kill(); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static void goDump(IBinder binder, FileDescriptor out, |
| 99 | String[] args) throws IOException, RemoteException { |
| 100 | goDump(binder, out, args, DEFAULT_TIMEOUT); |
| 101 | } |
| 102 | |
| 103 | static void goDump(IBinder binder, FileDescriptor out, |
| 104 | String[] args, long timeout) throws IOException, RemoteException { |
| 105 | if (binder instanceof Binder) { |
| 106 | // This is a local object... just call it directly. |
| 107 | try { |
| 108 | binder.dump(out, args); |
| 109 | } catch (RemoteException e) { |
| 110 | } |
| 111 | return; |
| 112 | } |
| 113 | |
| 114 | TransferPipe tp = new TransferPipe(); |
| 115 | try { |
| 116 | binder.dumpAsync(tp.getWriteFd().getFileDescriptor(), args); |
| 117 | tp.go(out, timeout); |
| 118 | } finally { |
| 119 | tp.kill(); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | void go(FileDescriptor out) throws IOException { |
| 124 | go(out, DEFAULT_TIMEOUT); |
| 125 | } |
| 126 | |
| 127 | void go(FileDescriptor out, long timeout) throws IOException { |
| 128 | try { |
| 129 | synchronized (this) { |
| 130 | mOutFd = out; |
| 131 | mEndTime = SystemClock.uptimeMillis() + timeout; |
| 132 | |
| 133 | if (DEBUG) Slog.i(TAG, "read=" + getReadFd() + " write=" + getWriteFd() |
| 134 | + " out=" + out); |
| 135 | |
| 136 | // Close the write fd, so we know when the other side is done. |
| 137 | closeFd(1); |
| 138 | |
| 139 | mThread.start(); |
| 140 | |
| 141 | while (mFailure == null && !mComplete) { |
| 142 | long waitTime = mEndTime - SystemClock.uptimeMillis(); |
| 143 | if (waitTime <= 0) { |
| 144 | if (DEBUG) Slog.i(TAG, "TIMEOUT!"); |
| 145 | mThread.interrupt(); |
| 146 | throw new IOException("Timeout"); |
| 147 | } |
| 148 | |
| 149 | try { |
| 150 | wait(waitTime); |
| 151 | } catch (InterruptedException e) { |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | if (DEBUG) Slog.i(TAG, "Finished: " + mFailure); |
| 156 | if (mFailure != null) { |
| 157 | throw new IOException(mFailure); |
| 158 | } |
| 159 | } |
| 160 | } finally { |
| 161 | kill(); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | void closeFd(int num) { |
| 166 | if (mFds[num] != null) { |
| 167 | if (DEBUG) Slog.i(TAG, "Closing: " + mFds[num]); |
| 168 | try { |
| 169 | mFds[num].close(); |
| 170 | } catch (IOException e) { |
| 171 | } |
| 172 | mFds[num] = null; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | void kill() { |
| 177 | closeFd(0); |
| 178 | closeFd(1); |
| 179 | } |
| 180 | |
| 181 | @Override |
| 182 | public void run() { |
| 183 | final byte[] buffer = new byte[1024]; |
| 184 | final FileInputStream fis = new FileInputStream(getReadFd().getFileDescriptor()); |
| 185 | final FileOutputStream fos = new FileOutputStream(mOutFd); |
| 186 | |
| 187 | if (DEBUG) Slog.i(TAG, "Ready to read pipe..."); |
| 188 | byte[] bufferPrefix = null; |
| 189 | boolean needPrefix = true; |
| 190 | if (mBufferPrefix != null) { |
| 191 | bufferPrefix = mBufferPrefix.getBytes(); |
| 192 | } |
| 193 | |
| 194 | int size; |
| 195 | try { |
| 196 | while ((size=fis.read(buffer)) > 0) { |
| 197 | if (DEBUG) Slog.i(TAG, "Got " + size + " bytes"); |
| 198 | if (bufferPrefix == null) { |
| 199 | fos.write(buffer, 0, size); |
| 200 | } else { |
| 201 | int start = 0; |
| 202 | for (int i=0; i<size; i++) { |
| 203 | if (buffer[i] != '\n') { |
| 204 | if (i > start) { |
| 205 | fos.write(buffer, start, i-start); |
| 206 | } |
| 207 | start = i; |
| 208 | if (needPrefix) { |
| 209 | fos.write(bufferPrefix); |
| 210 | needPrefix = false; |
| 211 | } |
| 212 | do { |
| 213 | i++; |
| 214 | } while (i<size && buffer[i] != '\n'); |
| 215 | if (i < size) { |
| 216 | needPrefix = true; |
| 217 | } |
| 218 | } |
| 219 | } |
| 220 | if (size > start) { |
| 221 | fos.write(buffer, start, size-start); |
| 222 | } |
| 223 | } |
| 224 | } |
| 225 | if (DEBUG) Slog.i(TAG, "End of pipe: size=" + size); |
| 226 | if (mThread.isInterrupted()) { |
| 227 | if (DEBUG) Slog.i(TAG, "Interrupted!"); |
| 228 | } |
| 229 | } catch (IOException e) { |
| 230 | synchronized (this) { |
| 231 | mFailure = e.toString(); |
| 232 | notifyAll(); |
| 233 | return; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | synchronized (this) { |
| 238 | mComplete = true; |
| 239 | notifyAll(); |
| 240 | } |
| 241 | } |
| 242 | } |