| /* |
| * Copyright (C) 2016 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 com.android.server.pm; |
| |
| import static android.os.Process.PACKAGE_INFO_GID; |
| import static android.os.Process.SYSTEM_UID; |
| |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageParser; |
| import android.os.FileUtils; |
| import android.util.AtomicFile; |
| import android.util.Log; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.BufferedInputStream; |
| import java.io.BufferedOutputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Map; |
| |
| class PackageUsage extends AbstractStatsBase<Map<String, PackageParser.Package>> { |
| |
| private static final String USAGE_FILE_MAGIC = "PACKAGE_USAGE__VERSION_"; |
| private static final String USAGE_FILE_MAGIC_VERSION_1 = USAGE_FILE_MAGIC + "1"; |
| |
| private boolean mIsHistoricalPackageUsageAvailable = true; |
| |
| PackageUsage() { |
| super("package-usage.list", "PackageUsage_DiskWriter", /* lock */ true); |
| } |
| |
| boolean isHistoricalPackageUsageAvailable() { |
| return mIsHistoricalPackageUsageAvailable; |
| } |
| |
| @Override |
| protected void writeInternal(Map<String, PackageParser.Package> packages) { |
| AtomicFile file = getFile(); |
| FileOutputStream f = null; |
| try { |
| f = file.startWrite(); |
| BufferedOutputStream out = new BufferedOutputStream(f); |
| FileUtils.setPermissions(file.getBaseFile().getPath(), |
| 0640, SYSTEM_UID, PACKAGE_INFO_GID); |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append(USAGE_FILE_MAGIC_VERSION_1); |
| sb.append('\n'); |
| out.write(sb.toString().getBytes(StandardCharsets.US_ASCII)); |
| |
| for (PackageParser.Package pkg : packages.values()) { |
| if (pkg.getLatestPackageUseTimeInMills() == 0L) { |
| continue; |
| } |
| sb.setLength(0); |
| sb.append(pkg.packageName); |
| for (long usageTimeInMillis : pkg.mLastPackageUsageTimeInMills) { |
| sb.append(' '); |
| sb.append(usageTimeInMillis); |
| } |
| sb.append('\n'); |
| out.write(sb.toString().getBytes(StandardCharsets.US_ASCII)); |
| } |
| out.flush(); |
| file.finishWrite(f); |
| } catch (IOException e) { |
| if (f != null) { |
| file.failWrite(f); |
| } |
| Log.e(PackageManagerService.TAG, "Failed to write package usage times", e); |
| } |
| } |
| |
| @Override |
| protected void readInternal(Map<String, PackageParser.Package> packages) { |
| AtomicFile file = getFile(); |
| BufferedInputStream in = null; |
| try { |
| in = new BufferedInputStream(file.openRead()); |
| StringBuffer sb = new StringBuffer(); |
| |
| String firstLine = readLine(in, sb); |
| if (firstLine == null) { |
| // Empty file. Do nothing. |
| } else if (USAGE_FILE_MAGIC_VERSION_1.equals(firstLine)) { |
| readVersion1LP(packages, in, sb); |
| } else { |
| readVersion0LP(packages, in, sb, firstLine); |
| } |
| } catch (FileNotFoundException expected) { |
| mIsHistoricalPackageUsageAvailable = false; |
| } catch (IOException e) { |
| Log.w(PackageManagerService.TAG, "Failed to read package usage times", e); |
| } finally { |
| IoUtils.closeQuietly(in); |
| } |
| } |
| |
| private void readVersion0LP(Map<String, PackageParser.Package> packages, InputStream in, |
| StringBuffer sb, String firstLine) |
| throws IOException { |
| // Initial version of the file had no version number and stored one |
| // package-timestamp pair per line. |
| // Note that the first line has already been read from the InputStream. |
| for (String line = firstLine; line != null; line = readLine(in, sb)) { |
| String[] tokens = line.split(" "); |
| if (tokens.length != 2) { |
| throw new IOException("Failed to parse " + line + |
| " as package-timestamp pair."); |
| } |
| |
| String packageName = tokens[0]; |
| PackageParser.Package pkg = packages.get(packageName); |
| if (pkg == null) { |
| continue; |
| } |
| |
| long timestamp = parseAsLong(tokens[1]); |
| for (int reason = 0; |
| reason < PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT; |
| reason++) { |
| pkg.mLastPackageUsageTimeInMills[reason] = timestamp; |
| } |
| } |
| } |
| |
| private void readVersion1LP(Map<String, PackageParser.Package> packages, InputStream in, |
| StringBuffer sb) throws IOException { |
| // Version 1 of the file started with the corresponding version |
| // number and then stored a package name and eight timestamps per line. |
| String line; |
| while ((line = readLine(in, sb)) != null) { |
| String[] tokens = line.split(" "); |
| if (tokens.length != PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT + 1) { |
| throw new IOException("Failed to parse " + line + " as a timestamp array."); |
| } |
| |
| String packageName = tokens[0]; |
| PackageParser.Package pkg = packages.get(packageName); |
| if (pkg == null) { |
| continue; |
| } |
| |
| for (int reason = 0; |
| reason < PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT; |
| reason++) { |
| pkg.mLastPackageUsageTimeInMills[reason] = parseAsLong(tokens[reason + 1]); |
| } |
| } |
| } |
| |
| private long parseAsLong(String token) throws IOException { |
| try { |
| return Long.parseLong(token); |
| } catch (NumberFormatException e) { |
| throw new IOException("Failed to parse " + token + " as a long.", e); |
| } |
| } |
| |
| private String readLine(InputStream in, StringBuffer sb) throws IOException { |
| return readToken(in, sb, '\n'); |
| } |
| |
| private String readToken(InputStream in, StringBuffer sb, char endOfToken) |
| throws IOException { |
| sb.setLength(0); |
| while (true) { |
| int ch = in.read(); |
| if (ch == -1) { |
| if (sb.length() == 0) { |
| return null; |
| } |
| throw new IOException("Unexpected EOF"); |
| } |
| if (ch == endOfToken) { |
| return sb.toString(); |
| } |
| sb.append((char)ch); |
| } |
| } |
| } |