| /* |
| * Copyright (C) 2007 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.util; |
| |
| import java.io.BufferedReader; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.nio.BufferUnderflowException; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * Access to the system diagnostic event record. System diagnostic events are |
| * used to record certain system-level events (such as garbage collection, |
| * activity manager state, system watchdogs, and other low level activity), |
| * which may be automatically collected and analyzed during system development. |
| * |
| * <p>This is <b>not</b> the main "logcat" debugging log ({@link android.util.Log})! |
| * These diagnostic events are for system integrators, not application authors. |
| * |
| * <p>Events use integer tag codes corresponding to /system/etc/event-log-tags. |
| * They carry a payload of one or more int, long, or String values. The |
| * event-log-tags file defines the payload contents for each type code. |
| */ |
| public class EventLog { |
| /** @hide */ public EventLog() {} |
| |
| private static final String TAG = "EventLog"; |
| |
| private static final String TAGS_FILE = "/system/etc/event-log-tags"; |
| private static final String COMMENT_PATTERN = "^\\s*(#.*)?$"; |
| private static final String TAG_PATTERN = "^\\s*(\\d+)\\s+(\\w+)\\s*(\\(.*\\))?\\s*$"; |
| private static HashMap<String, Integer> sTagCodes = null; |
| private static HashMap<Integer, String> sTagNames = null; |
| |
| /** A previously logged event read from the logs. */ |
| public static final class Event { |
| private final ByteBuffer mBuffer; |
| |
| // Layout of event log entry received from Android logger. |
| // see system/core/include/log/logger.h |
| private static final int LENGTH_OFFSET = 0; |
| private static final int HEADER_SIZE_OFFSET = 2; |
| private static final int PROCESS_OFFSET = 4; |
| private static final int THREAD_OFFSET = 8; |
| private static final int SECONDS_OFFSET = 12; |
| private static final int NANOSECONDS_OFFSET = 16; |
| |
| // Layout for event log v1 format, v2 and v3 use HEADER_SIZE_OFFSET |
| private static final int V1_PAYLOAD_START = 20; |
| private static final int DATA_OFFSET = 4; |
| |
| // Value types |
| private static final byte INT_TYPE = 0; |
| private static final byte LONG_TYPE = 1; |
| private static final byte STRING_TYPE = 2; |
| private static final byte LIST_TYPE = 3; |
| private static final byte FLOAT_TYPE = 4; |
| |
| /** @param data containing event, read from the system */ |
| /*package*/ Event(byte[] data) { |
| mBuffer = ByteBuffer.wrap(data); |
| mBuffer.order(ByteOrder.nativeOrder()); |
| } |
| |
| /** @return the process ID which wrote the log entry */ |
| public int getProcessId() { |
| return mBuffer.getInt(PROCESS_OFFSET); |
| } |
| |
| /** @return the thread ID which wrote the log entry */ |
| public int getThreadId() { |
| return mBuffer.getInt(THREAD_OFFSET); |
| } |
| |
| /** @return the wall clock time when the entry was written */ |
| public long getTimeNanos() { |
| return mBuffer.getInt(SECONDS_OFFSET) * 1000000000l |
| + mBuffer.getInt(NANOSECONDS_OFFSET); |
| } |
| |
| /** @return the type tag code of the entry */ |
| public int getTag() { |
| int offset = mBuffer.getShort(HEADER_SIZE_OFFSET); |
| if (offset == 0) { |
| offset = V1_PAYLOAD_START; |
| } |
| return mBuffer.getInt(offset); |
| } |
| |
| /** @return one of Integer, Long, Float, String, null, or Object[] of same. */ |
| public synchronized Object getData() { |
| try { |
| int offset = mBuffer.getShort(HEADER_SIZE_OFFSET); |
| if (offset == 0) { |
| offset = V1_PAYLOAD_START; |
| } |
| mBuffer.limit(offset + mBuffer.getShort(LENGTH_OFFSET)); |
| mBuffer.position(offset + DATA_OFFSET); // Just after the tag. |
| return decodeObject(); |
| } catch (IllegalArgumentException e) { |
| Log.wtf(TAG, "Illegal entry payload: tag=" + getTag(), e); |
| return null; |
| } catch (BufferUnderflowException e) { |
| Log.wtf(TAG, "Truncated entry payload: tag=" + getTag(), e); |
| return null; |
| } |
| } |
| |
| /** @return the loggable item at the current position in mBuffer. */ |
| private Object decodeObject() { |
| byte type = mBuffer.get(); |
| switch (type) { |
| case INT_TYPE: |
| return mBuffer.getInt(); |
| |
| case LONG_TYPE: |
| return mBuffer.getLong(); |
| |
| case FLOAT_TYPE: |
| return mBuffer.getFloat(); |
| |
| case STRING_TYPE: |
| try { |
| int length = mBuffer.getInt(); |
| int start = mBuffer.position(); |
| mBuffer.position(start + length); |
| return new String(mBuffer.array(), start, length, "UTF-8"); |
| } catch (UnsupportedEncodingException e) { |
| Log.wtf(TAG, "UTF-8 is not supported", e); |
| return null; |
| } |
| |
| case LIST_TYPE: |
| int length = mBuffer.get(); |
| if (length < 0) length += 256; // treat as signed byte |
| Object[] array = new Object[length]; |
| for (int i = 0; i < length; ++i) array[i] = decodeObject(); |
| return array; |
| |
| default: |
| throw new IllegalArgumentException("Unknown entry type: " + type); |
| } |
| } |
| } |
| |
| // We assume that the native methods deal with any concurrency issues. |
| |
| /** |
| * Record an event log message. |
| * @param tag The event type tag code |
| * @param value A value to log |
| * @return The number of bytes written |
| */ |
| public static native int writeEvent(int tag, int value); |
| |
| /** |
| * Record an event log message. |
| * @param tag The event type tag code |
| * @param value A value to log |
| * @return The number of bytes written |
| */ |
| public static native int writeEvent(int tag, long value); |
| |
| /** |
| * Record an event log message. |
| * @param tag The event type tag code |
| * @param value A value to log |
| * @return The number of bytes written |
| */ |
| public static native int writeEvent(int tag, float value); |
| |
| /** |
| * Record an event log message. |
| * @param tag The event type tag code |
| * @param str A value to log |
| * @return The number of bytes written |
| */ |
| public static native int writeEvent(int tag, String str); |
| |
| /** |
| * Record an event log message. |
| * @param tag The event type tag code |
| * @param list A list of values to log |
| * @return The number of bytes written |
| */ |
| public static native int writeEvent(int tag, Object... list); |
| |
| /** |
| * Read events from the log, filtered by type. |
| * @param tags to search for |
| * @param output container to add events into |
| * @throws IOException if something goes wrong reading events |
| */ |
| public static native void readEvents(int[] tags, Collection<Event> output) |
| throws IOException; |
| |
| /** |
| * Get the name associated with an event type tag code. |
| * @param tag code to look up |
| * @return the name of the tag, or null if no tag has that number |
| */ |
| public static String getTagName(int tag) { |
| readTagsFile(); |
| return sTagNames.get(tag); |
| } |
| |
| /** |
| * Get the event type tag code associated with an event name. |
| * @param name of event to look up |
| * @return the tag code, or -1 if no tag has that name |
| */ |
| public static int getTagCode(String name) { |
| readTagsFile(); |
| Integer code = sTagCodes.get(name); |
| return code != null ? code : -1; |
| } |
| |
| /** |
| * Read TAGS_FILE, populating sTagCodes and sTagNames, if not already done. |
| */ |
| private static synchronized void readTagsFile() { |
| if (sTagCodes != null && sTagNames != null) return; |
| |
| sTagCodes = new HashMap<String, Integer>(); |
| sTagNames = new HashMap<Integer, String>(); |
| |
| Pattern comment = Pattern.compile(COMMENT_PATTERN); |
| Pattern tag = Pattern.compile(TAG_PATTERN); |
| BufferedReader reader = null; |
| String line; |
| |
| try { |
| reader = new BufferedReader(new FileReader(TAGS_FILE), 256); |
| while ((line = reader.readLine()) != null) { |
| if (comment.matcher(line).matches()) continue; |
| |
| Matcher m = tag.matcher(line); |
| if (!m.matches()) { |
| Log.wtf(TAG, "Bad entry in " + TAGS_FILE + ": " + line); |
| continue; |
| } |
| |
| try { |
| int num = Integer.parseInt(m.group(1)); |
| String name = m.group(2); |
| sTagCodes.put(name, num); |
| sTagNames.put(num, name); |
| } catch (NumberFormatException e) { |
| Log.wtf(TAG, "Error in " + TAGS_FILE + ": " + line, e); |
| } |
| } |
| } catch (IOException e) { |
| Log.wtf(TAG, "Error reading " + TAGS_FILE, e); |
| // Leave the maps existing but unpopulated |
| } finally { |
| try { if (reader != null) reader.close(); } catch (IOException e) {} |
| } |
| } |
| } |