1 /* 2 * Copyright (C) 2017 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 #ifndef STORAGE_MANAGER_H 18 #define STORAGE_MANAGER_H 19 20 #include <android/util/ProtoOutputStream.h> 21 #include <utils/Log.h> 22 #include <utils/RefBase.h> 23 24 #include "packages/UidMap.h" 25 26 namespace android { 27 namespace os { 28 namespace statsd { 29 30 using android::util::ProtoOutputStream; 31 32 class StorageManager : public virtual RefBase { 33 public: 34 /** 35 * Writes a given byte array as a file to the specified file path. 36 */ 37 static void writeFile(const char* file, const void* buffer, int numBytes); 38 39 /** 40 * Reads the file content to the buffer. 41 */ 42 static bool readFileToString(const char* file, string* content); 43 44 /** 45 * Deletes a single file given a file name. 46 */ 47 static void deleteFile(const char* file); 48 49 /** 50 * Deletes all files in a given directory. 51 */ 52 static void deleteAllFiles(const char* path); 53 54 /** 55 * Deletes all files whose name matches with a provided suffix. 56 */ 57 static void deleteSuffixedFiles(const char* path, const char* suffix); 58 59 /** 60 * Send broadcasts to relevant receiver for each data stored on disk. 61 */ 62 static void sendBroadcast(const char* path, 63 const std::function<void(const ConfigKey&)>& sendBroadcast); 64 65 /** 66 * Returns true if there's at least one report on disk. 67 */ 68 static bool hasConfigMetricsReport(const ConfigKey& key); 69 70 /** 71 * Appends ConfigMetricsReport found on disk to the specific proto and 72 * delete it. 73 */ 74 static void appendConfigMetricsReport(const ConfigKey& key, ProtoOutputStream* proto); 75 76 /** 77 * Call to load the saved configs from disk. 78 */ 79 static void readConfigFromDisk(std::map<ConfigKey, StatsdConfig>& configsMap); 80 81 /** 82 * Call to load the specified config from disk. Returns false if the config file does not 83 * exist or error occurs when reading the file. 84 */ 85 static bool readConfigFromDisk(const ConfigKey& key, StatsdConfig* config); 86 static bool readConfigFromDisk(const ConfigKey& key, string* config); 87 88 /** 89 * Trims files in the provided directory to limit the total size, number of 90 * files, accumulation of outdated files. 91 */ 92 static void trimToFit(const char* dir); 93 94 /** 95 * Returns true if there already exists identical configuration on device. 96 */ 97 static bool hasIdenticalConfig(const ConfigKey& key, 98 const vector<uint8_t>& config); 99 100 /** 101 * Prints disk usage statistics related to statsd. 102 */ 103 static void printStats(FILE* out); 104 105 private: 106 /** 107 * Prints disk usage statistics about a directory related to statsd. 108 */ 109 static void printDirStats(FILE* out, const char* path); 110 }; 111 112 } // namespace statsd 113 } // namespace os 114 } // namespace android 115 116 #endif // STORAGE_MANAGER_H 117
