| /* |
| * Copyright (C) 2009 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 android.os; |
| |
| import android.util.Log; |
| |
| import com.android.internal.os.IDropBoxManagerService; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.GZIPInputStream; |
| |
| /** |
| * Enqueues chunks of data (from various sources -- application crashes, kernel |
| * log records, etc.). The queue is size bounded and will drop old data if the |
| * enqueued data exceeds the maximum size. You can think of this as a |
| * persistent, system-wide, blob-oriented "logcat". |
| * |
| * <p>You can obtain an instance of this class by calling |
| * {@link android.content.Context#getSystemService} |
| * with {@link android.content.Context#DROPBOX_SERVICE}. |
| * |
| * <p>DropBoxManager entries are not sent anywhere directly, but other system |
| * services and debugging tools may scan and upload entries for processing. |
| */ |
| public class DropBoxManager { |
| private static final String TAG = "DropBoxManager"; |
| private final IDropBoxManagerService mService; |
| |
| /** Flag value: Entry's content was deleted to save space. */ |
| public static final int IS_EMPTY = 1; |
| |
| /** Flag value: Content is human-readable UTF-8 text (can be combined with IS_GZIPPED). */ |
| public static final int IS_TEXT = 2; |
| |
| /** Flag value: Content can be decompressed with {@link GZIPOutputStream}. */ |
| public static final int IS_GZIPPED = 4; |
| |
| /** |
| * A single entry retrieved from the drop box. |
| * This may include a reference to a stream, so you must call |
| * {@link #close()} when you are done using it. |
| */ |
| public static class Entry implements Parcelable { |
| private final String mTag; |
| private final long mTimeMillis; |
| |
| private final byte[] mData; |
| private final ParcelFileDescriptor mFileDescriptor; |
| private final int mFlags; |
| |
| /** Create a new empty Entry with no contents. */ |
| public Entry(String tag, long millis) { |
| this(tag, millis, (Object) null, IS_EMPTY); |
| } |
| |
| /** Create a new Entry with plain text contents. */ |
| public Entry(String tag, long millis, String text) { |
| this(tag, millis, (Object) text.getBytes(), IS_TEXT); |
| } |
| |
| /** |
| * Create a new Entry with byte array contents. |
| * The data array must not be modified after creating this entry. |
| */ |
| public Entry(String tag, long millis, byte[] data, int flags) { |
| this(tag, millis, (Object) data, flags); |
| } |
| |
| /** |
| * Create a new Entry with streaming data contents. |
| * Takes ownership of the ParcelFileDescriptor. |
| */ |
| public Entry(String tag, long millis, ParcelFileDescriptor data, int flags) { |
| this(tag, millis, (Object) data, flags); |
| } |
| |
| /** |
| * Create a new Entry with the contents read from a file. |
| * The file will be read when the entry's contents are requested. |
| */ |
| public Entry(String tag, long millis, File data, int flags) throws IOException { |
| this(tag, millis, (Object) ParcelFileDescriptor.open( |
| data, ParcelFileDescriptor.MODE_READ_ONLY), flags); |
| } |
| |
| /** Internal constructor for CREATOR.createFromParcel(). */ |
| private Entry(String tag, long millis, Object value, int flags) { |
| if (tag == null) throw new NullPointerException(); |
| if (((flags & IS_EMPTY) != 0) != (value == null)) throw new IllegalArgumentException(); |
| |
| mTag = tag; |
| mTimeMillis = millis; |
| mFlags = flags; |
| |
| if (value == null) { |
| mData = null; |
| mFileDescriptor = null; |
| } else if (value instanceof byte[]) { |
| mData = (byte[]) value; |
| mFileDescriptor = null; |
| } else if (value instanceof ParcelFileDescriptor) { |
| mData = null; |
| mFileDescriptor = (ParcelFileDescriptor) value; |
| } else { |
| throw new IllegalArgumentException(); |
| } |
| } |
| |
| /** Close the input stream associated with this entry. */ |
| public void close() { |
| try { if (mFileDescriptor != null) mFileDescriptor.close(); } catch (IOException e) { } |
| } |
| |
| /** @return the tag originally attached to the entry. */ |
| public String getTag() { return mTag; } |
| |
| /** @return time when the entry was originally created. */ |
| public long getTimeMillis() { return mTimeMillis; } |
| |
| /** @return flags describing the content returned by @{link #getInputStream()}. */ |
| public int getFlags() { return mFlags & ~IS_GZIPPED; } // getInputStream() decompresses. |
| |
| /** |
| * @param maxBytes of string to return (will truncate at this length). |
| * @return the uncompressed text contents of the entry, null if the entry is not text. |
| */ |
| public String getText(int maxBytes) { |
| if ((mFlags & IS_TEXT) == 0) return null; |
| if (mData != null) return new String(mData, 0, Math.min(maxBytes, mData.length)); |
| |
| InputStream is = null; |
| try { |
| is = getInputStream(); |
| byte[] buf = new byte[maxBytes]; |
| return new String(buf, 0, Math.max(0, is.read(buf))); |
| } catch (IOException e) { |
| return null; |
| } finally { |
| try { if (is != null) is.close(); } catch (IOException e) {} |
| } |
| } |
| |
| /** @return the uncompressed contents of the entry, or null if the contents were lost */ |
| public InputStream getInputStream() throws IOException { |
| InputStream is; |
| if (mData != null) { |
| is = new ByteArrayInputStream(mData); |
| } else if (mFileDescriptor != null) { |
| is = new ParcelFileDescriptor.AutoCloseInputStream(mFileDescriptor); |
| } else { |
| return null; |
| } |
| return (mFlags & IS_GZIPPED) != 0 ? new GZIPInputStream(is) : is; |
| } |
| |
| public static final Parcelable.Creator<Entry> CREATOR = new Parcelable.Creator() { |
| public Entry[] newArray(int size) { return new Entry[size]; } |
| public Entry createFromParcel(Parcel in) { |
| return new Entry( |
| in.readString(), in.readLong(), in.readValue(null), in.readInt()); |
| } |
| }; |
| |
| public int describeContents() { |
| return mFileDescriptor != null ? Parcelable.CONTENTS_FILE_DESCRIPTOR : 0; |
| } |
| |
| public void writeToParcel(Parcel out, int flags) { |
| out.writeString(mTag); |
| out.writeLong(mTimeMillis); |
| if (mFileDescriptor != null) { |
| out.writeValue(mFileDescriptor); |
| } else { |
| out.writeValue(mData); |
| } |
| out.writeInt(mFlags); |
| } |
| } |
| |
| /** {@hide} */ |
| public DropBoxManager(IDropBoxManagerService service) { mService = service; } |
| |
| /** |
| * Create a dummy instance for testing. All methods will fail unless |
| * overridden with an appropriate mock implementation. To obtain a |
| * functional instance, use {@link android.content.Context#getSystemService}. |
| */ |
| protected DropBoxManager() { mService = null; } |
| |
| /** |
| * Stores human-readable text. The data may be discarded eventually (or even |
| * immediately) if space is limited, or ignored entirely if the tag has been |
| * blocked (see {@link #isTagEnabled}). |
| * |
| * @param tag describing the type of entry being stored |
| * @param data value to store |
| */ |
| public void addText(String tag, String data) { |
| try { mService.add(new Entry(tag, 0, data)); } catch (RemoteException e) {} |
| } |
| |
| /** |
| * Stores binary data, which may be ignored or discarded as with {@link #addText}. |
| * |
| * @param tag describing the type of entry being stored |
| * @param data value to store |
| * @param flags describing the data |
| */ |
| public void addData(String tag, byte[] data, int flags) { |
| if (data == null) throw new NullPointerException(); |
| try { mService.add(new Entry(tag, 0, data, flags)); } catch (RemoteException e) {} |
| } |
| |
| /** |
| * Stores data read from a file descriptor. The data may be ignored or |
| * discarded as with {@link #addText}. You must close your |
| * ParcelFileDescriptor object after calling this method! |
| * |
| * @param tag describing the type of entry being stored |
| * @param fd file descriptor to read from |
| * @param flags describing the data |
| */ |
| public void addFile(String tag, ParcelFileDescriptor fd, int flags) { |
| if (fd == null) throw new NullPointerException(); |
| try { mService.add(new Entry(tag, 0, fd, flags)); } catch (RemoteException e) {} |
| } |
| |
| /** |
| * Checks any blacklists (set in system settings) to see whether a certain |
| * tag is allowed. Entries with disabled tags will be dropped immediately, |
| * so you can save the work of actually constructing and sending the data. |
| * |
| * @param tag that would be used in {@link #addText} or {@link #addFile} |
| * @return whether events with that tag would be accepted |
| */ |
| public boolean isTagEnabled(String tag) { |
| try { return mService.isTagEnabled(tag); } catch (RemoteException e) { return false; } |
| } |
| |
| /** |
| * Gets the next entry from the drop box *after* the specified time. |
| * Requires android.permission.READ_LOGS. You must always call |
| * {@link Entry#close()} on the return value! |
| * |
| * @param tag of entry to look for, null for all tags |
| * @param msec time of the last entry seen |
| * @return the next entry, or null if there are no more entries |
| */ |
| public Entry getNextEntry(String tag, long msec) { |
| try { return mService.getNextEntry(tag, msec); } catch (RemoteException e) { return null; } |
| } |
| |
| // TODO: It may be useful to have some sort of notification mechanism |
| // when data is added to the dropbox, for demand-driven readers -- |
| // for now readers need to poll the dropbox to find new data. |
| } |