/**
 * Copyright (c) 2017, 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 android.os;

import android.os.IStatsSubscriptionCallback;
import android.os.IPendingIntentRef;
import android.os.IPullAtomCallback;
import android.os.ParcelFileDescriptor;
import android.util.PropertyParcel;
import android.os.IStatsQueryCallback;

/**
  * Binder interface to communicate with the statistics management service.
  * {@hide}
  */
interface IStatsd {
    /**
     * Tell the stats daemon that the android system server is up and running.
     */
    oneway void systemRunning();

    /**
     * Tell the stats daemon that the android system has finished booting.
     */
    oneway void bootCompleted();

    /**
     * Tell the stats daemon that the StatsCompanionService is up and running.
     * Two-way binder call so that caller knows message received.
     */
    void statsCompanionReady();

    /**
     * Tells statsd that an anomaly may have occurred, so statsd can check whether this is so and
     * act accordingly.
     * Two-way binder call so that caller's method (and corresponding wakelocks) will linger.
     */
    void informAnomalyAlarmFired();

    /**
     * Tells statsd that it is time to poll some stats. Statsd will be responsible for determing
     * what stats to poll and initiating the polling.
     * Two-way binder call so that caller's method (and corresponding wakelocks) will linger.
     */
    void informPollAlarmFired();

    /**
     * Tells statsd that it is time to handle periodic alarms. Statsd will be responsible for
     * determing what alarm subscriber to trigger.
     * Two-way binder call so that caller's method (and corresponding wakelocks) will linger.
     */
    void informAlarmForSubscriberTriggeringFired();

    /**
     * Tells statsd that the device is about to shutdown.
     */
    void informDeviceShutdown();

    /**
     * Inform statsd about a file descriptor for a pipe through which we will pipe version
     * and package information for each uid.
     * Versions and package information are supplied via UidData proto where info for each app
     * is captured in its own element of a repeated ApplicationInfo message.
     */
    oneway void informAllUidData(in ParcelFileDescriptor fd);

    /**
     * Inform statsd what the uid, version, version_string, and installer are for one app that was
     * updated.
     */
    oneway void informOnePackage(in String app, in int uid, in long version,
        in String version_string, in String installer, in byte[] certificate_hash);

    /**
     * Inform stats that an app was removed.
     */
    oneway void informOnePackageRemoved(in String app, in int uid);

    /**
     * Fetches data for the specified configuration key. Returns a byte array representing proto
     * wire-encoded of ConfigMetricsReportList.
     *
     * Requires Manifest.permission.DUMP.
     * @deprecated use #getDataFd() instead for Android T+
     */
    byte[] getData(in long key, int callingUid);

    /**
     * Fetches metadata across statsd. Returns byte array representing wire-encoded proto.
     *
     * Requires Manifest.permission.DUMP.
     */
    byte[] getMetadata();

    /**
     * Sets a configuration with the specified config id and subscribes to updates for this
     * configuration key. Broadcasts will be sent if this configuration needs to be collected.
     * The configuration must be a wire-encoded StatsdConfig. The receiver for this data is
     * registered in a separate function.
     *
     * Requires Manifest.permission.DUMP.
     */
    void addConfiguration(in long configId, in byte[] config, in int callingUid);

    /**
     * Registers the given pending intent for this config key. This intent is invoked when the
     * memory consumed by the metrics for this configuration approach the pre-defined limits. There
     * can be at most one listener per config key.
     *
     * Requires Manifest.permission.DUMP.
     */
    void setDataFetchOperation(long configId, in IPendingIntentRef pendingIntentRef,
                               int callingUid);

    /**
     * Removes the data fetch operation for the specified configuration.
     *
     * Requires Manifest.permission.DUMP.
     */
    void removeDataFetchOperation(long configId, int callingUid);

    /**
     * Registers the given pending intent for this packagename. This intent is invoked when the
     * active status of any of the configs sent by this package changes and will contain a list of
     * config ids that are currently active. It also returns the list of configs that are currently
     * active. There can be at most one active configs changed listener per package.
     *
     * Requires Manifest.permission.DUMP and Manifest.permission.PACKAGE_USAGE_STATS.
     */
    long[] setActiveConfigsChangedOperation(in IPendingIntentRef pendingIntentRef, int callingUid);

    /**
     * Removes the active configs changed operation for the specified package name.
     *
     * Requires Manifest.permission.DUMP and Manifest.permission.PACKAGE_USAGE_STATS.
     */
    void removeActiveConfigsChangedOperation(int callingUid);

    /**
     * Removes the configuration with the matching config id. No-op if this config id does not
     * exist.
     *
     * Requires Manifest.permission.DUMP.
     */
    void removeConfiguration(in long configId, in int callingUid);

    /**
     * Set the PendingIntentRef to be used when broadcasting subscriber
     * information to the given subscriberId within the given config.
     *
     * Suppose that the calling uid has added a config with key configId, and that in this config
     * it is specified that when a particular anomaly is detected, a broadcast should be sent to
     * a BroadcastSubscriber with id subscriberId. This function links the given pendingIntent with
     * that subscriberId (for that config), so that this pendingIntent is used to send the broadcast
     * when the anomaly is detected.
     *
     * This function can only be called by the owner (uid) of the config. It must be called each
     * time statsd starts. Later calls overwrite previous calls; only one pendingIntent is stored.
     *
     * Requires Manifest.permission.DUMP.
     */
    void setBroadcastSubscriber(long configId, long subscriberId, in IPendingIntentRef pir,
                                int callingUid);

    /**
     * Undoes setBroadcastSubscriber() for the (configId, subscriberId) pair.
     * Any broadcasts associated with subscriberId will henceforth not be sent.
     * No-op if this (configKey, subscriberId) pair was not associated with an PendingIntentRef.
     *
     * Requires Manifest.permission.DUMP.
     */
    void unsetBroadcastSubscriber(long configId, long subscriberId, int callingUid);

    /**
     * Tell the stats daemon that all the pullers registered during boot have been sent.
     */
    oneway void allPullersFromBootRegistered();

    /**
     * Registers a puller callback function that, when invoked, pulls the data
     * for the specified atom tag.
     */
    oneway void registerPullAtomCallback(int uid, int atomTag, long coolDownMillis,
                                         long timeoutMillis,in int[] additiveFields,
                                         IPullAtomCallback pullerCallback);

    /**
     * Registers a puller callback function that, when invoked, pulls the data
     * for the specified atom tag.
     *
     * Enforces the REGISTER_STATS_PULL_ATOM permission.
     */
    oneway void registerNativePullAtomCallback(int atomTag, long coolDownMillis, long timeoutMillis,
                           in int[] additiveFields, IPullAtomCallback pullerCallback);

    /**
     * Unregisters any pullAtomCallback for the given uid/atom.
     */
    oneway void unregisterPullAtomCallback(int uid, int atomTag);

    /**
     * Unregisters any pullAtomCallback for the given atom + caller.
     *
     * Enforces the REGISTER_STATS_PULL_ATOM permission.
     */
    oneway void unregisterNativePullAtomCallback(int atomTag);

    /**
     * The install requires staging.
     */
    const int FLAG_REQUIRE_STAGING = 0x01;

    /**
     * Rollback is enabled with this install.
     */
    const int FLAG_ROLLBACK_ENABLED = 0x02;

    /**
     * Requires low latency monitoring.
     */
    const int FLAG_REQUIRE_LOW_LATENCY_MONITOR = 0x04;

    /**
     * Returns the most recently registered experiment IDs.
     */
    long[] getRegisteredExperimentIds();

    /**
     * Notifies of properties in statsd_java namespace.
     */
    oneway void updateProperties(in PropertyParcel[] properties);

    /** Section for restricted-logging methods. */
    /**
     * Queries data from underlying statsd sql store.
     */
    oneway void querySql(in String sqlQuery, in int minSqlClientVersion,
        in @nullable byte[] policyConfig, in IStatsQueryCallback queryCallback,
        in long configKey, in String configPackage, in int callingUid);

    /**
     * Registers the operation that is called whenever there is a change in the restricted metrics
     * for a specified config that are present for this client. This operation allows statsd to
     * inform the client about the current restricted metrics available to be queried for the
     * specified config.
     *
     * Requires Manifest.permission.READ_RESTRICTED_STATS
     */
    long[] setRestrictedMetricsChangedOperation(in long configKey, in String configPackage,
            in IPendingIntentRef pir, int callingUid);

    /**
     * Removes the restricted metrics changed operation for the specified config package/id.
     *
     * Requires Manifest.permission.READ_RESTRICTED_STATS.
     */
    void removeRestrictedMetricsChangedOperation(in long configKey, in String configPackage,
            in int callingUid);

    /** Section for atoms subscription methods. */
    /**
     * Adds a subscription for atom events.
     *
     * IStatsSubscriptionCallback Binder interface will be used to deliver subscription data back to
     * the subscriber. IStatsSubscriptionCallback also uniquely identifies this subscription - it
     * should not be reused for another subscription.
     *
     * Enforces caller is in the traced_probes selinux domain.
     */
    oneway void addSubscription(in byte[] subscriptionConfig,
            IStatsSubscriptionCallback callback);

    /**
     * Unsubscribe from a given subscription identified by the IBinder token.
     *
     * This will subsequently trigger IStatsSubscriptionCallback with pending data
     * for this subscription.
     *
     * Enforces caller is in the traced_probes selinux domain.
     */
    oneway void removeSubscription(IStatsSubscriptionCallback callback);

    /**
     * Flush data for a subscription.
     *
     * This will subsequently trigger IStatsSubscriptionCallback with pending data
     * for this subscription.
     *
     * Enforces caller is in the traced_probes selinux domain.
     */
    oneway void flushSubscription(IStatsSubscriptionCallback callback);

    /**
     * Same as #getData(in long key, int callingUid), but the data is stored in a file descriptor.
     *
     * The call is async, purpose is to initiate data transfer process.
     * Report is expected to be written into fd.
     * The content schema is |4 bytes - expected report size in bytes|report body of len bytes|EOF|.
     * fd will be closed automatically at the end of the transaction.
     * To confirm report correctness expected report size should be equal to size of report body
     * read from file descriptor. Any IOException during the read signals about failure and API
     * call should be considered as failed.
     *
     * Requires Manifest.permission.DUMP.
     */
    oneway void getDataFd(long key, int callingUid, in ParcelFileDescriptor fd);
}