Merge "Add a check for duplicate configuration on statsd" into pi-dev (a32913f0) · Commits · e / os / android_frameworks_base

cmds/statsd/src/config/ConfigManager.cpp

+22 −10

Original line number	Diff line number	Diff line
		@@ -68,12 +68,25 @@ void ConfigManager::UpdateConfig(const ConfigKey& key, const StatsdConfig& confi
		{
		lock_guard <mutex> lock(mMutex);

		auto it = mConfigs.find(key);

		const int numBytes = config.ByteSize();
		vector<uint8_t> buffer(numBytes);
		config.SerializeToArray(&buffer[0], numBytes);

		const bool isDuplicate =
		it != mConfigs.end() &&
		StorageManager::hasIdenticalConfig(key, buffer);

		// Update saved file on disk. We still update timestamp of file when
		// there exists a duplicate configuration to avoid garbage collection.
		update_saved_configs_locked(key, buffer, numBytes);

		if (isDuplicate) return;

		// Add to set
		mConfigs.insert(key);

		// Save to disk
		update_saved_configs_locked(key, config);

		for (sp<ConfigListener> listener : mListeners) {
		broadcastList.push_back(listener);
		}
		@@ -137,7 +150,6 @@ void ConfigManager::RemoveConfigs(int uid) {
		{
		lock_guard <mutex> lock(mMutex);


		for (auto it = mConfigs.begin(); it != mConfigs.end();) {
		// Remove from map
		if (it->GetUid() == uid) {
		@@ -230,16 +242,16 @@ void ConfigManager::Dump(FILE* out) {
		}
		}

		void ConfigManager::update_saved_configs_locked(const ConfigKey& key, const StatsdConfig& config) {
		void ConfigManager::update_saved_configs_locked(const ConfigKey& key,
		const vector<uint8_t>& buffer,
		const int numBytes) {
		// If there is a pre-existing config with same key we should first delete it.
		remove_saved_configs(key);

		// Then we save the latest config.
		string file_name = StringPrintf("%s/%ld_%d_%lld", STATS_SERVICE_DIR, time(nullptr),
		string file_name =
		StringPrintf("%s/%ld_%d_%lld", STATS_SERVICE_DIR, time(nullptr),
		key.GetUid(), (long long)key.GetId());
		const int numBytes = config.ByteSize();
		vector<uint8_t> buffer(numBytes);
		config.SerializeToArray(&buffer[0], numBytes);
		StorageManager::writeFile(file_name.c_str(), &buffer[0], numBytes);
		}

cmds/statsd/src/config/ConfigManager.h

+4 −2

Original line number	Diff line number	Diff line
		@@ -115,7 +115,9 @@ private:
		/**
		* Save the configs to disk.
		*/
		void update_saved_configs_locked(const ConfigKey& key, const StatsdConfig& config);
		void update_saved_configs_locked(const ConfigKey& key,
		const std::vector<uint8_t>& buffer,
		const int numBytes);

		/**
		* Remove saved configs from disk.
		@@ -123,7 +125,7 @@ private:
		void remove_saved_configs(const ConfigKey& key);

		/**
		* The Configs that have been set. Each config should
		* Config keys that have been set.
		*/
		std::set<ConfigKey> mConfigs;

cmds/statsd/src/storage/StorageManager.cpp

+39 −0

Original line number	Diff line number	Diff line
		@@ -245,6 +245,45 @@ void StorageManager::readConfigFromDisk(map<ConfigKey, StatsdConfig>& configsMap
		}
		}

		bool StorageManager::hasIdenticalConfig(const ConfigKey& key,
		const vector<uint8_t>& config) {
		unique_ptr<DIR, decltype(&closedir)> dir(opendir(STATS_SERVICE_DIR),
		closedir);
		if (dir == NULL) {
		VLOG("Directory does not exist: %s", STATS_SERVICE_DIR);
		return false;
		}

		const char* suffix =
		StringPrintf("%d_%lld", key.GetUid(), (long long)key.GetId()).c_str();

		dirent* de;
		while ((de = readdir(dir.get()))) {
		char* name = de->d_name;
		if (name[0] == '.') {
		continue;
		}
		size_t nameLen = strlen(name);
		size_t suffixLen = strlen(suffix);
		// There can be at most one file that matches this suffix (config key).
		if (suffixLen <= nameLen &&
		strncmp(name + nameLen - suffixLen, suffix, suffixLen) == 0) {
		int fd = open(StringPrintf("%s/%s", STATS_SERVICE_DIR, name).c_str(),
		O_RDONLY \| O_CLOEXEC);
		if (fd != -1) {
		string content;
		if (android::base::ReadFdToString(fd, &content)) {
		vector<uint8_t> vec(content.begin(), content.end());
		if (vec == config) {
		return true;
		}
		}
		}
		}
		}
		return false;
		}

		void StorageManager::trimToFit(const char* path) {
		unique_ptr<DIR, decltype(&closedir)> dir(opendir(path), closedir);
		if (dir == NULL) {

cmds/statsd/src/storage/StorageManager.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -78,6 +78,12 @@ public:
		* files, accumulation of outdated files.
		*/
		static void trimToFit(const char* dir);

		/**
		* Returns true if there already exists identical configuration on device.
		*/
		static bool hasIdenticalConfig(const ConfigKey& key,
		const vector<uint8_t>& config);
		};

		} // namespace statsd