Backed out 7 changesets (bug 1942424) for causing frequent crashes. a=backout

[gecko.git] / toolkit / components / telemetry / core / nsITelemetry.idl

/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"
#include "nsIFile.idl"

[scriptable,function, uuid(3d3b9075-5549-4244-9c08-b64fefa1dd60)]
interface nsIFetchTelemetryDataCallback : nsISupports
{
  void complete();
};

[scriptable, uuid(273d2dd0-6c63-475a-b864-cb65160a1909)]
interface nsITelemetry : nsISupports
{
  /**
   * Histogram types:
   * HISTOGRAM_EXPONENTIAL - buckets increase exponentially
   * HISTOGRAM_LINEAR - buckets increase linearly
   * HISTOGRAM_BOOLEAN - For storing 0/1 values
   * HISTOGRAM_FLAG - For storing a single value; its count is always == 1.
   * HISTOGRAM_COUNT - For storing counter values without bucketing.
   * HISTOGRAM_CATEGORICAL - For storing enumerated values by label.
   */
  const unsigned long HISTOGRAM_EXPONENTIAL = 0;
  const unsigned long HISTOGRAM_LINEAR = 1;
  const unsigned long HISTOGRAM_BOOLEAN = 2;
  const unsigned long HISTOGRAM_FLAG = 3;
  const unsigned long HISTOGRAM_COUNT = 4;
  const unsigned long HISTOGRAM_CATEGORICAL = 5;

  /**
   * Scalar types:
   * SCALAR_TYPE_COUNT - for storing a numeric value
   * SCALAR_TYPE_STRING - for storing a string value
   * SCALAR_TYPE_BOOLEAN - for storing a boolean value
   */
  const unsigned long SCALAR_TYPE_COUNT = 0;
  const unsigned long SCALAR_TYPE_STRING = 1;
  const unsigned long SCALAR_TYPE_BOOLEAN = 2;

  /**
   * Dataset types:
   * DATASET_ALL_CHANNELS - the basic dataset that is on-by-default on all channels
   * DATASET_PRERELEASE_CHANNELS - the extended dataset that is opt-in on release,
   *                                 opt-out on pre-release channels.
   */
  const unsigned long DATASET_ALL_CHANNELS = 0;
  const unsigned long DATASET_PRERELEASE_CHANNELS = 1;

  /**
   * Serializes the histogram labels for categorical hitograms.
   * The returned structure looks like:
   *   { "histogram1": [ "histogram1_label1", "histogram1_label2", ...],
   *     "histogram2": [ "histogram2_label1", "histogram2_label2", ...]
   *     ...
   *     }
   *
   * Note that this function should only be used in tests and about:telemetry.
   */
  [implicit_jscontext]
  jsval getCategoricalLabels();

  /**
   * Serializes the histograms from the given store to a JSON-style object.
   * The returned structure looks like:
   *   { "process": { "name1": histogramData1, "name2": histogramData2 }, ... }
   *
   * Each histogram is represented in a packed format and has the following properties:
   *   bucket_count - Number of buckets of this histogram
   *   histogram_type - HISTOGRAM_EXPONENTIAL, HISTOGRAM_LINEAR, HISTOGRAM_BOOLEAN,
   *                    HISTOGRAM_FLAG, HISTOGRAM_COUNT, or HISTOGRAM_CATEGORICAL
   *   sum - sum of the bucket contents
   *   range - A 2-item array of minimum and maximum bucket size
   *   values - Map from bucket to the bucket's count
   *
   * @param aStoreName The name of the store to snapshot.
   *                   Defaults to "main".
   *                   Custom stores are available when probes have them defined.
   *                   See the `record_into_store` attribute on histograms.
   *                   @see https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/collection/histograms.html#record-into-store
   * @param aClearStore Whether to clear out the histograms in the named store after snapshotting.
   *                    Defaults to false.
   * @param aFilterTest If true, `TELEMETRY_TEST_` histograms will be filtered out.
                        Filtered histograms are still cleared if `aClearStore` is true.
   *                    Defaults to false.
   */
  [implicit_jscontext]
  jsval getSnapshotForHistograms([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);

  /**
   * Serializes the keyed histograms from the given store to a JSON-style object.
   * The returned structure looks like:
   *   { "process": { "name1": { "key_1": histogramData1, "key_2": histogramData2 }, ...}, ... }
   *
   * @param aStoreName The name of the store to snapshot.
   *                   Defaults to "main".
   *                   Custom stores are available when probes have them defined.
   *                   See the `record_into_store` attribute on histograms.
   *                   @see https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/collection/histograms.html#record-into-store
   * @param aClearStore Whether to clear out the keyed histograms in the named store after snapshotting.
   *                    Defaults to false.
   * @param aFilterTest If true, `TELEMETRY_TEST_` histograms will be filtered out.
                        Filtered histograms are still cleared if `aClearStore` is true.
   *                    Defaults to false.
   */
  [implicit_jscontext]
  jsval getSnapshotForKeyedHistograms([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);

  /**
   * Serializes the scalars from the given store to a JSON-style object.
   * The returned structure looks like:
   *   { "process": { "category1.probe": 1,"category1.other_probe": false, ... }, ... }.
   *
   * @param aStoreName The name of the store to snapshot.
   *                   Defaults to "main".
   *                   Custom stores are available when probes have them defined.
   *                   See the `record_into_store` attribute on scalars.
   *                   @see https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/collection/scalars.html#optional-fields
   * @param aClearStore Whether to clear out the scalars in the named store after snapshotting.
   *                    Defaults to false.
   * @param aFilterTest If true, `telemetry.test` scalars will be filtered out.
                        Filtered scalars are still cleared if `aClearStore` is true.
   *                    Defaults to false.
   */
  [implicit_jscontext]
  jsval getSnapshotForScalars([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);

  /**
   * Serializes the keyed scalars from the given store to a JSON-style object.
   * The returned structure looks like:
   *   { "process": { "category1.probe": { "key_1": 2, "key_2": 1, ... }, ... }, ... }
   *
   * @param aStoreName The name of the store to snapshot.
   *                   Defaults to "main".
   *                   Custom stores are available when probes have them defined.
   *                   See the `record_into_store` attribute on scalars.
   *                   @see https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/collection/scalars.html#optional-fields
   * @param aClearStore Whether to clear out the keyed scalars in the named store after snapshotting.
   *                    Defaults to false.
   * @param aFilterTest If true, `telemetry.test` scalars will be filtered out.
                        Filtered scalars are still cleared if `aClearStore` is true.
   *                    Defaults to false.
   */
  [implicit_jscontext]
  jsval getSnapshotForKeyedScalars([optional] in ACString aStoreName, [optional] in boolean aClearStore, [optional] in boolean aFilterTest);

  /**
   * The amount of time, in milliseconds, that the last session took
   * to shutdown.  Reads as 0 to indicate failure.
   */
  readonly attribute uint32_t lastShutdownDuration;

  /**
   * The number of failed profile lock attempts that have occurred prior to
   * successfully locking the profile
   */
  readonly attribute uint32_t failedProfileLockCount;

  /*
   * An object containing information about slow SQL statements.
   *
   * {
   *   mainThread: { "sqlString1": [<hit count>, <total time>], "sqlString2": [...], ... },
   *   otherThreads: { "sqlString3": [<hit count>, <total time>], "sqlString4": [...], ... }
   * }
   *
   * where:
   *   mainThread: Slow statements that executed on the main thread
   *   otherThreads: Slow statements that executed on a non-main thread
   *   sqlString - String of the offending statement (see note)
   *   hit count - The number of times this statement required longer than the threshold time to execute
   *   total time - The sum of all execution times above the threshold time for this statement
   *
   * Note that dynamic SQL strings and SQL strings executed against addon DBs could contain private information.
   * This property represents such SQL as aggregate database-level stats and the sqlString contains the database
   * filename instead.
   */
  [implicit_jscontext]
  readonly attribute jsval slowSQL;

  /*
   * See slowSQL above.
   *
   * An object containing full strings of every slow SQL statement if toolkit.telemetry.debugSlowSql = true
   * The returned SQL strings may contain private information and should not be reported to Telemetry.
   */
  [implicit_jscontext]
  readonly attribute jsval debugSlowSQL;

  /**
   * Flags for getUntrustedModuleLoadEvents.
   */

  /**
   * This flag is set to retrieve all data including instances which have been
   * retrieved before.  If not set, only new instances since the last call
   * will be returned.
   * If this flag is set, KEEP_LOADEVENTS_NEW must not be set unless
   * EXCLUDE_STACKINFO_FROM_LOADEVENTS is set.
   * (See also MultiGetUntrustedModulesData::Serialize.)
   */
  const unsigned long INCLUDE_OLD_LOADEVENTS = 1 << 0;

  /**
   * This flag is set to keep the returned instances as if they were not
   * retrieved, meaning those instances will be returned by a next method
   * call without INCLUDE_OLD_LOADEVENTS.  If not set, the returned instances
   * can be re-retrieved only when INCLUDE_OLD_LOADEVENTS is specified.
   * If this flag is set, INCLUDE_OLD_LOADEVENTS must not be set unless
   * EXCLUDE_STACKINFO_FROM_LOADEVENTS is set.
   * (See also MultiGetUntrustedModulesData::Serialize.)
   */
  const unsigned long KEEP_LOADEVENTS_NEW = 1 << 1;

  /**
   * This flag is set to include private fields.
   * Do not specify this flag to retrieve data to be submitted.
   */
  const unsigned long INCLUDE_PRIVATE_FIELDS_IN_LOADEVENTS = 1 << 2;

  /**
   * This flag is set to exclude the "combinedStacks" field.
   * Without this flag, the flags INCLUDE_OLD_LOADEVENTS and KEEP_LOADEVENTS_NEW
   * cannot be set at the same time.
   */
  const unsigned long EXCLUDE_STACKINFO_FROM_LOADEVENTS = 1 << 3;

  /*
   * An array of untrusted module load events. Each element describes one or
   * more modules that were loaded, contextual information at the time of the
   * event (including stack trace), and flags describing the module's
   * trustworthiness.
   *
   * @param aFlags   Combination (bitwise OR) of the flags specified above.
   *                 Defaults to 0.
   */
  [implicit_jscontext]
  Promise getUntrustedModuleLoadEvents([optional] in unsigned long aFlags);

  /*
   * Whether the untrusted module load events are ready for processing.
   * Calling getUntrustedModuleLoadEvents() before this attribute is true
   * will result in an empty array. */
  readonly attribute boolean areUntrustedModuleLoadEventsReady;

  /*
   * Asynchronously get an array of the modules loaded in the process.
   *
   * The data has the following structure:
   *
   * [
   *   {
   *     "name": <string>, // Name of the module file (e.g. xul.dll)
   *     "version": <string>, // Version of the module
   *     "debugName": <string>, // ID of the debug information file
   *     "debugID": <string>, // Name of the debug information file
   *     "certSubject": <string>, // Name of the organization that signed the binary (Optional, only defined when present)
   *   },
   *   ...
   * ]
   *
   * @return A promise that resolves to an array of modules or rejects with
             NS_ERROR_FAILURE on failure.
   * @throws NS_ERROR_NOT_IMPLEMENTED if the Gecko profiler is not enabled.
   */
  [implicit_jscontext]
  Promise getLoadedModules();

  /*
   * An object with two fields: memoryMap and stacks.
   * * memoryMap is a list of loaded libraries.
   * * stacks is a list of stacks. Each stack is a list of pairs of the form
   *   [moduleIndex, offset]. The moduleIndex is an index into the memoryMap and
   *   offset is an offset in the library at memoryMap[moduleIndex].
   * This format is used to make it easier to send the stacks to the
   * symbolication server.
   */
  [implicit_jscontext]
  readonly attribute jsval lateWrites;

  /**
   * Create and return a histogram registered in TelemetryHistograms.h.
   *
   * @param id - unique identifier from TelemetryHistograms.h
   * The returned object has the following functions:
   *   add(value) - Adds a sample of `value` to the histogram.
                    `value` may be a categorical histogram's label as a string,
                    a boolean histogram's value as a boolean,
                    or a number that fits inside a uint32_t.
   *   snapshot([optional] {store}) - Returns a snapshot of the histogram with the same data fields
                                      as in getSnapshotForHistograms().
                                      Defaults to the "main" store.
   *   clear([optional] {store}) - Zeros out the histogram's buckets and sum.
                                   Defaults to the "main" store.
                                   Note: This is intended to be only used in tests.
   */
  [implicit_jscontext]
  jsval getHistogramById(in ACString id);

  /**
   * Create and return a histogram registered in TelemetryHistograms.h.
   *
   * @param id - unique identifier from TelemetryHistograms.h
   * The returned object has the following functions:
   *   add(string key, [optional] value) - Adds a sample of `value` to the histogram for that key.
                                         If no histogram for that key exists yet, it is created.
                                         `value` may be a categorical histogram's label as a string,
                                         a boolean histogram's value as a boolean,
                                         or a number that fits inside a uint32_t.
   *   snapshot([optional] {store}) - Returns the snapshots of all the registered keys in the form
                                      {key1: snapshot1, key2: snapshot2, ...} in the specified store.
   *                                  Defaults to the "main" store.
   *   keys([optional] {store}) - Returns an array with the string keys of the currently registered
                                  histograms in the given store.
                                  Defaults to "main".
   *   clear([optional] {store}) - Clears the registered histograms from this.
   *                               Defaults to the "main" store.
   *                               Note: This is intended to be only used in tests.
   */
  [implicit_jscontext]
  jsval getKeyedHistogramById(in ACString id);

  /**
   * A flag indicating if Telemetry can record base data (FHR data). This is true if the
   * FHR data reporting service or self-support are enabled.
   *
   * In the unlikely event that adding a new base probe is needed, please check the data
   * collection wiki at https://wiki.mozilla.org/Firefox/Data_Collection and talk to the
   * Telemetry team.
   */
  attribute boolean canRecordBase;

  /**
   * A flag indicating if Telemetry is allowed to record extended data. Returns false if
   * the user hasn't opted into "extended Telemetry" on the Release channel, when the
   * user has explicitly opted out of Telemetry on Nightly/Aurora/Beta or if manually
   * set to false during tests.
   *
   * Set this to false in tests to disable gathering of extended telemetry statistics.
   */
  attribute boolean canRecordExtended;

  /**
   * A flag indicating whether Telemetry is recording release data, which is a
   * smallish subset of our usage data that we're prepared to handle from our
   * largish release population.
   *
   * This is true most of the time.
   *
   * This will always return true in the case of a non-content child process.
   * Only values returned on the parent process are valid.
   *
   * This does not indicate whether Telemetry will send any data. That is
   * governed by user preference and other mechanisms.
   *
   * You may use this to determine if it's okay to record your data.
   */
  readonly attribute boolean canRecordReleaseData;

  /**
   * A flag indicating whether Telemetry is recording prerelease data, which is
   * a largish amount of usage data that we're prepared to handle from our
   * smallish pre-release population.
   *
   * This is true on pre-release branches of Firefox.
   *
   * This does not indicate whether Telemetry will send any data. That is
   * governed by user preference and other mechanisms.
   *
   * You may use this to determine if it's okay to record your data.
   */
  readonly attribute boolean canRecordPrereleaseData;

  /**
   * A flag indicating whether Telemetry can submit official results (for base or extended
   * data). This is true on official, non-debug builds with built in support for Mozilla
   * Telemetry reporting.
   *
   * This will always return true in the case of a non-content child process.
   * Only values returned on the parent process are valid.
   */
  readonly attribute boolean isOfficialTelemetry;

  /**
   * Read data from the previous run. After the callback is called, the last
   * shutdown time is available in lastShutdownDuration and any late
   * writes in lateWrites.
   */
  void asyncFetchTelemetryData(in nsIFetchTelemetryDataCallback aCallback);

  /**
   * Get statistics of file IO reports, null, if not recorded.
   *
   * The statistics are returned as an object whose propoerties are the names
   * of the files that have been accessed and whose corresponding values are
   * arrays of size three, representing startup, normal, and shutdown stages.
   * Each stage's entry is either null or an array with the layout
   * [total_time, #creates, #reads, #writes, #fsyncs, #stats]
   */
  [implicit_jscontext]
  readonly attribute jsval fileIOReports;

  /**
   * Return the number of milliseconds since process start using monotonic
   * timestamps (unaffected by system clock changes). On Windows, this includes
   * the period of time the device was suspended. On Linux and macOS, this does
   * not include the period of time the device was suspneded.
   */
  double msSinceProcessStart();

  /**
   * Return the number of milliseconds since process start using monotonic
   * timestamps (unaffected by system clock changes), including the periods of
   * time the device was suspended.
   * @throws NS_ERROR_NOT_AVAILABLE if unavailable.
   */
  double msSinceProcessStartIncludingSuspend();

  /**
   * Return the number of milliseconds since process start using monotonic
   * timestamps (unaffected by system clock changes), excluding the periods of
   * time the device was suspended.
   * @throws NS_ERROR_NOT_AVAILABLE if unavailable.
   */
  double msSinceProcessStartExcludingSuspend();

  /**
   * Time since the system wide epoch. This is not a monotonic timer but
   * can be used across process boundaries.
   */
  double msSystemNow();

  /**
   * Resets all the stored scalars. This is intended to be only used in tests.
   */
  void clearScalars();

  /**
   * Immediately sends any Telemetry batched on this process to the parent
   * process. This is intended only to be used on process shutdown.
   */
  void flushBatchedChildTelemetry();

  /**
   * Serializes the recorded events to a JSON-appropriate array and optionally resets them.
   * The returned structure looks like this:
   *   [
   *     // [timestamp, category, method, object, stringValue, extraValues]
   *     [43245, "category1", "method1", "object1", "string value", null],
   *     [43258, "category1", "method2", "object1", null, {"key1": "string value"}],
   *     ...
   *   ]
   *
   * @param aDataset DATASET_ALL_CHANNELS or DATASET_PRERELEASE_CHANNELS.
   * @param [aClear=false] Whether to clear out the flushed events after snapshotting.
   * @param aEventLimit How many events per process to limit the snapshot to contain, all if unspecified.
   *                    Even if aClear, the leftover event records are not cleared.
   */
  [implicit_jscontext, optional_argc]
  jsval snapshotEvents(in uint32_t aDataset, [optional] in boolean aClear, [optional] in uint32_t aEventLimit);

  /**
   * Parent process only. Register dynamic builtin events.
   *
   * This function is only meant to be used to support the "artifact build"/
   * "build faster" developers by allowing to add new events without rebuilding
   * the C++ components including the headers files.
   *
   * @param aCategory The unique category the events are registered in.
   * @param aEventData An object that contains registration data for 1-N events of the form:
   *   {
   *     "categoryName": {
   *       "methods": ["test1"],
   *       "objects": ["object1"],
   *       "record_on_release": false,
   *       "extra_keys": ["key1", "key2"], // optional
   *       "expired": false // optional, defaults to false.
   *     },
   *     ...
   *   }
   * @param aEventData.<name>.methods List of methods for this event entry.
   * @param aEventData.<name>.objects List of objects for this event entry.
   * @param aEventData.<name>.extra_keys Optional, list of allowed extra keys for this event entry.
   * @param aEventData.<name>.record_on_release Optional, whether to record this data on release.
   *                                            Defaults to false.
   * @param aEventData.<name>.expired Optional, whether this event entry is expired. This allows
   *                                  recording it without error, but it will be discarded. Defaults to false.
   */
  [implicit_jscontext]
  void registerBuiltinEvents(in ACString aCategory, in jsval aEventData);

  /**
   * Parent process only. Register dynamic builtin scalars. This allows
   * registering multiple scalars for a category. They will be valid only for
   * the current Firefox session.
   *
   * This function is only meant to be used to support the "artifact build"/
   * "build faster" developers by allowing to add new scalars without rebuilding
   * the C++ components including the headers files.
   *
   * @param aCategoryName The unique category the scalars are registered in.
   * @param aScalarData An object that contains registration data for multiple scalars in the form:
   *   {
   *     "sample_scalar": {
   *       "kind": Ci.nsITelemetry.SCALAR_TYPE_COUNT,
   *       "keyed": true, //optional, defaults to false
   *       "record_on_release: true, // optional, defaults to false
   *       "expired": false // optional, defaults to false.
   *     },
   *     ...
   *   }
   * @param aScalarData.<name>.kind One of the scalar types defined in this file (SCALAR_TYPE_*)
   * @param aScalarData.<name>.keyed Optional, whether this is a keyed scalar or not. Defaults to false.
   * @param aScalarData.<name>.record_on_release Optional, whether to record this data on release.
   *                                             Defaults to false.
   * @param aScalarData.<name>.expired Optional, whether this scalar entry is expired. This allows
   *                                   recording it without error, but it will be discarded. Defaults to false.
   */
  [implicit_jscontext]
  void registerBuiltinScalars(in ACString aCategoryName, in jsval aScalarData);

  /**
   * Resets all the stored events. This is intended to be only used in tests.
   * Events recorded but not yet flushed to the parent process storage won't be cleared.
   * Override the pref. `toolkit.telemetry.ipcBatchTimeout` to reduce the time to flush events.
   */
  void clearEvents();

  /**
   * Get a list of all registered stores.
   *
   * The list is deduplicated, but unordered.
   */
  [implicit_jscontext]
  jsval getAllStores();

  /**
   * Does early, cheap initialization for native telemetry data providers.
   * Currently, this includes only MemoryTelemetry.
   */
  void earlyInit();

  /**
   * Does late, expensive initialization for native telemetry data providers.
   * Currently, this includes only MemoryTelemetry.
   *
   * This should only be called after startup has completed and the event loop
   * is idle.
   */
  void delayedInit();

  /**
   * Shuts down native telemetry providers. Currently, this includes only
   * MemoryTelemetry.
   */
  void shutdown();

  /**
   * Gathers telemetry data for memory usage and records it to the data store.
   * Returns a promise which resolves when asynchronous data collection has
   * completed and all data has been recorded.
   */
  [implicit_jscontext]
  Promise gatherMemory();
};