Andreas Gampe | 37e5fdc | 2016-07-12 22:42:41 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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.pm; |
| 18 | |
| 19 | import static android.os.Process.PACKAGE_INFO_GID; |
| 20 | import static android.os.Process.SYSTEM_UID; |
| 21 | |
| 22 | import android.content.pm.PackageManager; |
| 23 | import android.content.pm.PackageParser; |
| 24 | import android.os.FileUtils; |
| 25 | import android.util.AtomicFile; |
| 26 | import android.util.Log; |
| 27 | |
| 28 | import libcore.io.IoUtils; |
| 29 | |
| 30 | import java.io.BufferedInputStream; |
| 31 | import java.io.BufferedOutputStream; |
| 32 | import java.io.FileNotFoundException; |
| 33 | import java.io.FileOutputStream; |
| 34 | import java.io.IOException; |
| 35 | import java.io.InputStream; |
| 36 | import java.nio.charset.StandardCharsets; |
| 37 | import java.util.Map; |
| 38 | |
| 39 | class PackageUsage extends AbstractStatsBase<Map<String, PackageParser.Package>> { |
| 40 | |
| 41 | private static final String USAGE_FILE_MAGIC = "PACKAGE_USAGE__VERSION_"; |
| 42 | private static final String USAGE_FILE_MAGIC_VERSION_1 = USAGE_FILE_MAGIC + "1"; |
| 43 | |
| 44 | private boolean mIsHistoricalPackageUsageAvailable = true; |
| 45 | |
| 46 | PackageUsage() { |
| 47 | super("package-usage.list", "PackageUsage_DiskWriter", /* lock */ true); |
| 48 | } |
| 49 | |
| 50 | boolean isHistoricalPackageUsageAvailable() { |
| 51 | return mIsHistoricalPackageUsageAvailable; |
| 52 | } |
| 53 | |
| 54 | @Override |
| 55 | protected void writeInternal(Map<String, PackageParser.Package> packages) { |
| 56 | AtomicFile file = getFile(); |
| 57 | FileOutputStream f = null; |
| 58 | try { |
| 59 | f = file.startWrite(); |
| 60 | BufferedOutputStream out = new BufferedOutputStream(f); |
| 61 | FileUtils.setPermissions(file.getBaseFile().getPath(), |
| 62 | 0640, SYSTEM_UID, PACKAGE_INFO_GID); |
| 63 | StringBuilder sb = new StringBuilder(); |
| 64 | |
| 65 | sb.append(USAGE_FILE_MAGIC_VERSION_1); |
| 66 | sb.append('\n'); |
| 67 | out.write(sb.toString().getBytes(StandardCharsets.US_ASCII)); |
| 68 | |
| 69 | for (PackageParser.Package pkg : packages.values()) { |
| 70 | if (pkg.getLatestPackageUseTimeInMills() == 0L) { |
| 71 | continue; |
| 72 | } |
| 73 | sb.setLength(0); |
| 74 | sb.append(pkg.packageName); |
| 75 | for (long usageTimeInMillis : pkg.mLastPackageUsageTimeInMills) { |
| 76 | sb.append(' '); |
| 77 | sb.append(usageTimeInMillis); |
| 78 | } |
| 79 | sb.append('\n'); |
| 80 | out.write(sb.toString().getBytes(StandardCharsets.US_ASCII)); |
| 81 | } |
| 82 | out.flush(); |
| 83 | file.finishWrite(f); |
| 84 | } catch (IOException e) { |
| 85 | if (f != null) { |
| 86 | file.failWrite(f); |
| 87 | } |
| 88 | Log.e(PackageManagerService.TAG, "Failed to write package usage times", e); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | protected void readInternal(Map<String, PackageParser.Package> packages) { |
| 94 | AtomicFile file = getFile(); |
| 95 | BufferedInputStream in = null; |
| 96 | try { |
| 97 | in = new BufferedInputStream(file.openRead()); |
| 98 | StringBuffer sb = new StringBuffer(); |
| 99 | |
| 100 | String firstLine = readLine(in, sb); |
| 101 | if (firstLine == null) { |
| 102 | // Empty file. Do nothing. |
| 103 | } else if (USAGE_FILE_MAGIC_VERSION_1.equals(firstLine)) { |
| 104 | readVersion1LP(packages, in, sb); |
| 105 | } else { |
| 106 | readVersion0LP(packages, in, sb, firstLine); |
| 107 | } |
| 108 | } catch (FileNotFoundException expected) { |
| 109 | mIsHistoricalPackageUsageAvailable = false; |
| 110 | } catch (IOException e) { |
| 111 | Log.w(PackageManagerService.TAG, "Failed to read package usage times", e); |
| 112 | } finally { |
| 113 | IoUtils.closeQuietly(in); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | private void readVersion0LP(Map<String, PackageParser.Package> packages, InputStream in, |
| 118 | StringBuffer sb, String firstLine) |
| 119 | throws IOException { |
| 120 | // Initial version of the file had no version number and stored one |
| 121 | // package-timestamp pair per line. |
| 122 | // Note that the first line has already been read from the InputStream. |
| 123 | for (String line = firstLine; line != null; line = readLine(in, sb)) { |
| 124 | String[] tokens = line.split(" "); |
| 125 | if (tokens.length != 2) { |
| 126 | throw new IOException("Failed to parse " + line + |
| 127 | " as package-timestamp pair."); |
| 128 | } |
| 129 | |
| 130 | String packageName = tokens[0]; |
| 131 | PackageParser.Package pkg = packages.get(packageName); |
| 132 | if (pkg == null) { |
| 133 | continue; |
| 134 | } |
| 135 | |
| 136 | long timestamp = parseAsLong(tokens[1]); |
| 137 | for (int reason = 0; |
| 138 | reason < PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT; |
| 139 | reason++) { |
| 140 | pkg.mLastPackageUsageTimeInMills[reason] = timestamp; |
| 141 | } |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | private void readVersion1LP(Map<String, PackageParser.Package> packages, InputStream in, |
| 146 | StringBuffer sb) throws IOException { |
| 147 | // Version 1 of the file started with the corresponding version |
| 148 | // number and then stored a package name and eight timestamps per line. |
| 149 | String line; |
| 150 | while ((line = readLine(in, sb)) != null) { |
| 151 | String[] tokens = line.split(" "); |
| 152 | if (tokens.length != PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT + 1) { |
| 153 | throw new IOException("Failed to parse " + line + " as a timestamp array."); |
| 154 | } |
| 155 | |
| 156 | String packageName = tokens[0]; |
| 157 | PackageParser.Package pkg = packages.get(packageName); |
| 158 | if (pkg == null) { |
| 159 | continue; |
| 160 | } |
| 161 | |
| 162 | for (int reason = 0; |
| 163 | reason < PackageManager.NOTIFY_PACKAGE_USE_REASONS_COUNT; |
| 164 | reason++) { |
| 165 | pkg.mLastPackageUsageTimeInMills[reason] = parseAsLong(tokens[reason + 1]); |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | private long parseAsLong(String token) throws IOException { |
| 171 | try { |
| 172 | return Long.parseLong(token); |
| 173 | } catch (NumberFormatException e) { |
| 174 | throw new IOException("Failed to parse " + token + " as a long.", e); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | private String readLine(InputStream in, StringBuffer sb) throws IOException { |
| 179 | return readToken(in, sb, '\n'); |
| 180 | } |
| 181 | |
| 182 | private String readToken(InputStream in, StringBuffer sb, char endOfToken) |
| 183 | throws IOException { |
| 184 | sb.setLength(0); |
| 185 | while (true) { |
| 186 | int ch = in.read(); |
| 187 | if (ch == -1) { |
| 188 | if (sb.length() == 0) { |
| 189 | return null; |
| 190 | } |
| 191 | throw new IOException("Unexpected EOF"); |
| 192 | } |
| 193 | if (ch == endOfToken) { |
| 194 | return sb.toString(); |
| 195 | } |
| 196 | sb.append((char)ch); |
| 197 | } |
| 198 | } |
| 199 | } |