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package com.android.launcher3.logging;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.util.Log;
import android.util.Pair;
import com.android.launcher3.LauncherModel;
import com.android.launcher3.Utilities;
import com.android.launcher3.config.ProviderConfig;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Wrapper around {@link Log} to allow writing to a file.
* This class can safely be called from main thread.
*
* Note: This should only be used for logging errors which have a persistent effect on user's data,
* but whose effect may not be visible immediately.
*/
public final class FileLog {
private static final String FILE_NAME_PREFIX = "log-";
private static final DateFormat DATE_FORMAT =
DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
private static final long MAX_LOG_FILE_SIZE = 4 << 20; // 4 mb
private static Handler sHandler = null;
private static File sLogsDirectory = null;
public static void setDir(File logsDir) {
if (ProviderConfig.IS_DOGFOOD_BUILD || Utilities.IS_DEBUG_DEVICE) {
synchronized (DATE_FORMAT) {
// If the target directory changes, stop any active thread.
if (sHandler != null && !logsDir.equals(sLogsDirectory)) {
((HandlerThread) sHandler.getLooper().getThread()).quit();
sHandler = null;
}
}
}
sLogsDirectory = logsDir;
}
public static void d(String tag, String msg, Exception e) {
Log.d(tag, msg, e);
print(tag, msg, e);
}
public static void d(String tag, String msg) {
Log.d(tag, msg);
print(tag, msg);
}
public static void e(String tag, String msg, Exception e) {
Log.e(tag, msg, e);
print(tag, msg, e);
}
public static void e(String tag, String msg) {
Log.e(tag, msg);
print(tag, msg);
}
public static void print(String tag, String msg) {
print(tag, msg, null);
}
public static void print(String tag, String msg, Exception e) {
if (!ProviderConfig.IS_DOGFOOD_BUILD) {
return;
}
String out = String.format("%s %s %s", DATE_FORMAT.format(new Date()), tag, msg);
if (e != null) {
out += "\n" + Log.getStackTraceString(e);
}
Message.obtain(getHandler(), LogWriterCallback.MSG_WRITE, out).sendToTarget();
}
private static Handler getHandler() {
synchronized (DATE_FORMAT) {
if (sHandler == null) {
HandlerThread thread = new HandlerThread("file-logger");
thread.start();
sHandler = new Handler(thread.getLooper(), new LogWriterCallback());
}
}
return sHandler;
}
/**
* Blocks until all the pending logs are written to the disk
* @param out if not null, all the persisted logs are copied to the writer.
*/
public static void flushAll(PrintWriter out) throws InterruptedException {
if (!ProviderConfig.IS_DOGFOOD_BUILD) {
return;
}
CountDownLatch latch = new CountDownLatch(1);
Message.obtain(getHandler(), LogWriterCallback.MSG_FLUSH,
Pair.create(out, latch)).sendToTarget();
latch.await(2, TimeUnit.SECONDS);
}
/**
* Writes logs to the file.
* Log files are named log-0 for even days of the year and log-1 for odd days of the year.
* Logs older than 36 hours are purged.
*/
private static class LogWriterCallback implements Handler.Callback {
private static final long CLOSE_DELAY = 5000; // 5 seconds
private static final int MSG_WRITE = 1;
private static final int MSG_CLOSE = 2;
private static final int MSG_FLUSH = 3;
private String mCurrentFileName = null;
private PrintWriter mCurrentWriter = null;
private void closeWriter() {
Utilities.closeSilently(mCurrentWriter);
mCurrentWriter = null;
}
@Override
public boolean handleMessage(Message msg) {
if (sLogsDirectory == null || !ProviderConfig.IS_DOGFOOD_BUILD) {
return true;
}
switch (msg.what) {
case MSG_WRITE: {
Calendar cal = Calendar.getInstance();
// suffix with 0 or 1 based on the day of the year.
String fileName = FILE_NAME_PREFIX + (cal.get(Calendar.DAY_OF_YEAR) & 1);
if (!fileName.equals(mCurrentFileName)) {
closeWriter();
}
try {
if (mCurrentWriter == null) {
mCurrentFileName = fileName;
boolean append = false;
File logFile = new File(sLogsDirectory, fileName);
if (logFile.exists()) {
Calendar modifiedTime = Calendar.getInstance();
modifiedTime.setTimeInMillis(logFile.lastModified());
// If the file was modified more that 36 hours ago, purge the file.
// We use instead of 24 to account for day-365 followed by day-1
modifiedTime.add(Calendar.HOUR, 36);
append = cal.before(modifiedTime)
&& logFile.length() < MAX_LOG_FILE_SIZE;
}
mCurrentWriter = new PrintWriter(new FileWriter(logFile, append));
}
mCurrentWriter.println((String) msg.obj);
mCurrentWriter.flush();
// Auto close file stream after some time.
sHandler.removeMessages(MSG_CLOSE);
sHandler.sendEmptyMessageDelayed(MSG_CLOSE, CLOSE_DELAY);
} catch (Exception e) {
Log.e("FileLog", "Error writing logs to file", e);
// Close stream, will try reopening during next log
closeWriter();
}
return true;
}
case MSG_CLOSE: {
closeWriter();
return true;
}
case MSG_FLUSH: {
closeWriter();
Pair<PrintWriter, CountDownLatch> p =
(Pair<PrintWriter, CountDownLatch>) msg.obj;
if (p.first != null) {
dumpFile(p.first, FILE_NAME_PREFIX + 0);
dumpFile(p.first, FILE_NAME_PREFIX + 1);
}
p.second.countDown();
return true;
}
}
return true;
}
}
private static void dumpFile(PrintWriter out, String fileName) {
File logFile = new File(sLogsDirectory, fileName);
if (logFile.exists()) {
BufferedReader in = null;
try {
in = new BufferedReader(new FileReader(logFile));
out.println();
out.println("--- logfile: " + fileName + " ---");
String line;
while ((line = in.readLine()) != null) {
out.println(line);
}
} catch (Exception e) {
// ignore
} finally {
Utilities.closeSilently(in);
}
}
}
}
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