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// 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 https://mozilla.org/MPL/2.0/. #![deny(missing_docs)] //! Glean is a modern approach for recording and sending Telemetry data. //! //! It's in use at Mozilla. //! //! All documentation can be found online: //! //! ## [The Glean SDK Book](https://mozilla.github.io/glean) use std::collections::HashMap; use std::path::{Path, PathBuf}; use chrono::{DateTime, FixedOffset}; use once_cell::sync::Lazy; use once_cell::sync::OnceCell; use std::sync::Mutex; use uuid::Uuid; // This needs to be included first, and the space below prevents rustfmt from // alphabetizing it. mod macros; mod common_metric_data; mod database; mod debug; mod error; mod error_recording; mod event_database; mod histogram; mod internal_metrics; mod internal_pings; pub mod metrics; pub mod ping; pub mod storage; mod system; pub mod upload; mod util; pub use crate::common_metric_data::{CommonMetricData, Lifetime}; use crate::database::Database; use crate::debug::DebugOptions; pub use crate::error::{Error, ErrorKind, Result}; pub use crate::error_recording::{test_get_num_recorded_errors, ErrorType}; use crate::event_database::EventDatabase; use crate::internal_metrics::CoreMetrics; use crate::internal_pings::InternalPings; use crate::metrics::{Metric, MetricType, PingType}; use crate::ping::PingMaker; use crate::storage::StorageManager; use crate::upload::{PingUploadManager, PingUploadTask, UploadResult}; use crate::util::{local_now_with_offset, sanitize_application_id}; const GLEAN_VERSION: &str = env!("CARGO_PKG_VERSION"); const GLEAN_SCHEMA_VERSION: u32 = 1; const DEFAULT_MAX_EVENTS: usize = 500; static KNOWN_CLIENT_ID: Lazy<Uuid> = Lazy::new(|| Uuid::parse_str("c0ffeec0-ffee-c0ff-eec0-ffeec0ffeec0").unwrap()); // An internal ping name, not to be touched by anything else pub(crate) const INTERNAL_STORAGE: &str = "glean_internal_info"; // The names of the pings directories. pub(crate) const PENDING_PINGS_DIRECTORY: &str = "pending_pings"; pub(crate) const DELETION_REQUEST_PINGS_DIRECTORY: &str = "deletion_request"; /// The global Glean instance. /// /// This is the singleton used by all wrappers to allow for a nice API. /// All state for Glean is kept inside this object (such as the database handle and `upload_enabled` flag). /// /// It should be initialized with `glean_core::initialize` at the start of the application using /// Glean. static GLEAN: OnceCell<Mutex<Glean>> = OnceCell::new(); /// Get a reference to the global Glean object. pub fn global_glean() -> Option<&'static Mutex<Glean>> { GLEAN.get() } /// Set or replace the global Glean object. pub fn setup_glean(glean: Glean) -> Result<()> { // The `OnceCell` type wrapping our Glean is thread-safe and can only be set once. // Therefore even if our check for it being empty succeeds, setting it could fail if a // concurrent thread is quicker in setting it. // However this will not cause a bigger problem, as the second `set` operation will just fail. // We can log it and move on. // // For all wrappers this is not a problem, as the Glean object is intialized exactly once on // calling `initialize` on the global singleton and further operations check that it has been // initialized. if GLEAN.get().is_none() { if GLEAN.set(Mutex::new(glean)).is_err() { log::error!( "Global Glean object is initialized already. This probably happened concurrently." ) } } else { // We allow overriding the global Glean object to support test mode. // In test mode the Glean object is fully destroyed and recreated. // This all happens behind a mutex and is therefore also thread-safe.. let mut lock = GLEAN.get().unwrap().lock().unwrap(); *lock = glean; } Ok(()) } /// The Glean configuration. /// /// Optional values will be filled in with default values. #[derive(Debug, Clone)] pub struct Configuration { /// Whether upload should be enabled. pub upload_enabled: bool, /// Path to a directory to store all data in. pub data_path: String, /// The application ID (will be sanitized during initialization). pub application_id: String, /// The name of the programming language used by the binding creating this instance of Glean. pub language_binding_name: String, /// The maximum number of events to store before sending a ping containing events. pub max_events: Option<usize>, /// Whether Glean should delay persistence of data from metrics with ping lifetime. pub delay_ping_lifetime_io: bool, } /// The object holding meta information about a Glean instance. /// /// ## Example /// /// Create a new Glean instance, register a ping, record a simple counter and then send the final /// ping. /// /// ```rust,no_run /// # use glean_core::{Glean, Configuration, CommonMetricData, metrics::*}; /// let cfg = Configuration { /// data_path: "/tmp/glean".into(), /// application_id: "glean.sample.app".into(), /// language_binding_name: "Rust".into(), /// upload_enabled: true, /// max_events: None, /// delay_ping_lifetime_io: false, /// }; /// let mut glean = Glean::new(cfg).unwrap(); /// let ping = PingType::new("sample", true, false, vec![]); /// glean.register_ping_type(&ping); /// /// let call_counter: CounterMetric = CounterMetric::new(CommonMetricData { /// name: "calls".into(), /// category: "local".into(), /// send_in_pings: vec!["sample".into()], /// ..Default::default() /// }); /// /// call_counter.add(&glean, 1); /// /// glean.submit_ping(&ping, None).unwrap(); /// ``` /// /// ## Note /// /// In specific language bindings, this is usually wrapped in a singleton and all metric recording goes to a single instance of this object. /// In the Rust core, it is possible to create multiple instances, which is used in testing. #[derive(Debug)] pub struct Glean { upload_enabled: bool, data_store: Option<Database>, event_data_store: EventDatabase, core_metrics: CoreMetrics, internal_pings: InternalPings, data_path: PathBuf, application_id: String, ping_registry: HashMap<String, PingType>, start_time: DateTime<FixedOffset>, max_events: usize, is_first_run: bool, upload_manager: PingUploadManager, debug: DebugOptions, } impl Glean { /// Create and initialize a new Glean object for use in a subprocess. /// Importantly, this will not send any pings at startup, since that /// sort of management should only happen in the main process. pub fn new_for_subprocess(cfg: &Configuration) -> Result<Self> { log::info!("Creating new Glean v{}", GLEAN_VERSION); let application_id = sanitize_application_id(&cfg.application_id); if application_id.is_empty() { return Err(ErrorKind::InvalidConfig.into()); } // Creating the data store creates the necessary path as well. // If that fails we bail out and don't initialize further. let data_store = Some(Database::new(&cfg.data_path, cfg.delay_ping_lifetime_io)?); let event_data_store = EventDatabase::new(&cfg.data_path)?; // Create an upload manager with rate limiting of 10 pings every 60 seconds. let mut upload_manager = PingUploadManager::new(&cfg.data_path, &cfg.language_binding_name, false); upload_manager.set_rate_limiter( /* seconds per interval */ 60, /* max tasks per interval */ 15, ); Ok(Self { upload_enabled: cfg.upload_enabled, data_store, event_data_store, core_metrics: CoreMetrics::new(), internal_pings: InternalPings::new(), upload_manager, data_path: PathBuf::from(&cfg.data_path), application_id, ping_registry: HashMap::new(), start_time: local_now_with_offset(), max_events: cfg.max_events.unwrap_or(DEFAULT_MAX_EVENTS), is_first_run: false, debug: DebugOptions::new(), }) } /// Create and initialize a new Glean object. /// /// This will create the necessary directories and files in `data_path`. /// This will also initialize the core metrics. pub fn new(cfg: Configuration) -> Result<Self> { let mut glean = Self::new_for_subprocess(&cfg)?; // The upload enabled flag may have changed since the last run, for // example by the changing of a config file. if cfg.upload_enabled { // If upload is enabled, just follow the normal code path to // instantiate the core metrics. glean.on_upload_enabled(); } else { // If upload is disabled, and we've never run before, only set the // client_id to KNOWN_CLIENT_ID, but do not send a deletion request // ping. // If we have run before, and if the client_id is not equal to // the KNOWN_CLIENT_ID, do the full upload disabled operations to // clear metrics, set the client_id to KNOWN_CLIENT_ID, and send a // deletion request ping. match glean .core_metrics .client_id .get_value(&glean, "glean_client_info") { None => glean.clear_metrics(), Some(uuid) => { if uuid != *KNOWN_CLIENT_ID { // Temporarily enable uploading so we can submit a // deletion request ping. glean.upload_enabled = true; glean.on_upload_disabled(); } } } } Ok(glean) } /// For tests make it easy to create a Glean object using only the required configuration. #[cfg(test)] pub(crate) fn with_options( data_path: &str, application_id: &str, upload_enabled: bool, ) -> Result<Self> { let cfg = Configuration { data_path: data_path.into(), application_id: application_id.into(), language_binding_name: "Rust".into(), upload_enabled, max_events: None, delay_ping_lifetime_io: false, }; Self::new(cfg) } /// Destroy the database. /// After this Glean needs to be reinitialized. pub fn destroy_db(&mut self) { self.data_store = None; } /// Initialize the core metrics managed by Glean's Rust core. fn initialize_core_metrics(&mut self) { let need_new_client_id = match self .core_metrics .client_id .get_value(self, "glean_client_info") { None => true, Some(uuid) => uuid == *KNOWN_CLIENT_ID, }; if need_new_client_id { self.core_metrics.client_id.generate_and_set(self); } if self .core_metrics .first_run_date .get_value(self, "glean_client_info") .is_none() { self.core_metrics.first_run_date.set(self, None); // The `first_run_date` field is generated on the very first run // and persisted across upload toggling. We can assume that, the only // time it is set, that's indeed our "first run". self.is_first_run = true; } self.set_application_lifetime_core_metrics(); } /// Called when Glean is initialized to the point where it can correctly /// assemble pings. Usually called from the language specific layer after all /// of the core metrics have been set and the ping types have been /// registered. /// /// # Return value /// /// `true` if at least one ping was generated, `false` otherwise. pub fn on_ready_to_submit_pings(&self) -> bool { self.event_data_store.flush_pending_events_on_startup(&self) } /// Set whether upload is enabled or not. /// /// When uploading is disabled, metrics aren't recorded at all and no /// data is uploaded. /// /// When disabling, all pending metrics, events and queued pings are cleared. /// /// When enabling, the core Glean metrics are recreated. /// /// If the value of this flag is not actually changed, this is a no-op. /// /// # Arguments /// /// * `flag` - When true, enable metric collection. /// /// # Returns /// /// * Returns true when the flag was different from the current value, and /// actual work was done to clear or reinstate metrics. pub fn set_upload_enabled(&mut self, flag: bool) -> bool { log::info!("Upload enabled: {:?}", flag); if self.upload_enabled != flag { if flag { self.on_upload_enabled(); } else { self.on_upload_disabled(); } true } else { false } } /// Determine whether upload is enabled. /// /// When upload is disabled, no data will be recorded. pub fn is_upload_enabled(&self) -> bool { self.upload_enabled } /// Handles the changing of state from upload disabled to enabled. /// /// Should only be called when the state actually changes. /// /// The upload_enabled flag is set to true and the core Glean metrics are /// recreated. fn on_upload_enabled(&mut self) { self.upload_enabled = true; self.initialize_core_metrics(); } /// Handles the changing of state from upload enabled to disabled. /// /// Should only be called when the state actually changes. /// /// A deletion_request ping is sent, all pending metrics, events and queued /// pings are cleared, and the client_id is set to KNOWN_CLIENT_ID. /// Afterward, the upload_enabled flag is set to false. fn on_upload_disabled(&mut self) { // The upload_enabled flag should be true here, or the deletion ping // won't be submitted. if let Err(err) = self.internal_pings.deletion_request.submit(self, None) { log::error!("Failed to submit deletion-request ping on optout: {}", err); } self.clear_metrics(); self.upload_enabled = false; } /// Clear any pending metrics when telemetry is disabled. fn clear_metrics(&mut self) { // Clear the pending pings queue and acquire the lock // so that it can't be accessed until this function is done. let _lock = self.upload_manager.clear_ping_queue(); // There is only one metric that we want to survive after clearing all // metrics: first_run_date. Here, we store its value so we can restore // it after clearing the metrics. let existing_first_run_date = self .core_metrics .first_run_date .get_value(self, "glean_client_info"); // Clear any pending pings. let ping_maker = PingMaker::new(); if let Err(err) = ping_maker.clear_pending_pings(self.get_data_path()) { log::error!("Error clearing pending pings: {}", err); } // Delete all stored metrics. // Note that this also includes the ping sequence numbers, so it has // the effect of resetting those to their initial values. if let Some(data) = self.data_store.as_ref() { data.clear_all() } if let Err(err) = self.event_data_store.clear_all() { log::error!("Error clearing pending events: {}", err); } // This does not clear the experiments store (which isn't managed by the // StorageEngineManager), since doing so would mean we would have to have the // application tell us again which experiments are active if telemetry is // re-enabled. { // We need to briefly set upload_enabled to true here so that `set` // is not a no-op. This is safe, since nothing on the Rust side can // run concurrently to this since we hold a mutable reference to the // Glean object. Additionally, the pending pings have been cleared // from disk, so the PingUploader can't wake up and start sending // pings. self.upload_enabled = true; // Store a "dummy" KNOWN_CLIENT_ID in the client_id metric. This will // make it easier to detect if pings were unintentionally sent after // uploading is disabled. self.core_metrics.client_id.set(self, *KNOWN_CLIENT_ID); // Restore the first_run_date. if let Some(existing_first_run_date) = existing_first_run_date { self.core_metrics .first_run_date .set(self, Some(existing_first_run_date)); } self.upload_enabled = false; } } /// Get the application ID as specified on instantiation. pub fn get_application_id(&self) -> &str { &self.application_id } /// Get the data path of this instance. pub fn get_data_path(&self) -> &Path { &self.data_path } /// Get a handle to the database. pub fn storage(&self) -> &Database { &self.data_store.as_ref().expect("No database found") } /// Get a handle to the event database. pub fn event_storage(&self) -> &EventDatabase { &self.event_data_store } /// Get the maximum number of events to store before sending a ping. pub fn get_max_events(&self) -> usize { self.max_events } /// Gets the next task for an uploader. /// /// This can be one of: /// /// * `Wait` - which means the requester should ask again later; /// * `Upload(PingRequest)` - which means there is a ping to upload. This wraps the actual request object; /// * `Done` - which means there are no more pings queued right now. /// /// # Return value /// /// `PingUploadTask` - an enum representing the possible tasks. pub fn get_upload_task(&self) -> PingUploadTask { self.upload_manager.get_upload_task(self, self.log_pings()) } /// Processes the response from an attempt to upload a ping. /// /// # Arguments /// /// * `uuid` - The UUID of the ping in question. /// * `status` - The upload result. pub fn process_ping_upload_response(&self, uuid: &str, status: UploadResult) { self.upload_manager .process_ping_upload_response(self, uuid, status); } /// Take a snapshot for the given store and optionally clear it. /// /// ## Arguments /// /// * `store_name` - The store to snapshot. /// * `clear_store` - Whether to clear the store after snapshotting. /// /// ## Return value /// /// Returns the snapshot in a string encoded as JSON. /// If the snapshot is empty, it returns an empty string. pub fn snapshot(&mut self, store_name: &str, clear_store: bool) -> String { StorageManager .snapshot(&self.storage(), store_name, clear_store) .unwrap_or_else(|| String::from("")) } fn make_path(&self, ping_name: &str, doc_id: &str) -> String { format!( "/submit/{}/{}/{}/{}", self.get_application_id(), ping_name, GLEAN_SCHEMA_VERSION, doc_id ) } /// Collect and submit a ping for eventual uploading. /// /// The ping content is assembled as soon as possible, but upload is not /// guaranteed to happen immediately, as that depends on the upload /// policies. /// /// If the ping currently contains no content, it will not be sent. /// /// Returns true if a ping was assembled and queued, false otherwise. /// Returns an error if collecting or writing the ping to disk failed. /// /// ## Arguments /// * `ping`: The ping to submit /// * `reason`: A reason code to include in the ping pub fn submit_ping(&self, ping: &PingType, reason: Option<&str>) -> Result<bool> { if !self.is_upload_enabled() { log::error!("Glean disabled: not submitting any pings."); return Ok(false); } let ping_maker = PingMaker::new(); let doc_id = Uuid::new_v4().to_string(); let url_path = self.make_path(&ping.name, &doc_id); match ping_maker.collect(self, &ping, reason) { None => { log::info!( "No content for ping '{}', therefore no ping queued.", ping.name ); Ok(false) } Some(content) => { if let Err(e) = ping_maker.store_ping( self, &doc_id, &ping.name, &self.get_data_path(), &url_path, &content, ) { log::warn!("IO error while writing ping to file: {}", e); return Err(e.into()); } self.upload_manager.enqueue_ping_from_file(self, &doc_id); log::info!( "The ping '{}' was submitted and will be sent as soon as possible", ping.name ); Ok(true) } } } /// Collect and submit a ping by name for eventual uploading. /// /// The ping content is assembled as soon as possible, but upload is not /// guaranteed to happen immediately, as that depends on the upload /// policies. /// /// If the ping currently contains no content, it will not be sent. /// /// Returns true if a ping was assembled and queued, false otherwise. /// Returns an error if collecting or writing the ping to disk failed. /// /// ## Arguments /// * `ping_name`: The name of the ping to submit /// * `reason`: A reason code to include in the ping pub fn submit_ping_by_name(&self, ping_name: &str, reason: Option<&str>) -> Result<bool> { match self.get_ping_by_name(ping_name) { None => { log::error!("Attempted to submit unknown ping '{}'", ping_name); Ok(false) } Some(ping) => self.submit_ping(ping, reason), } } /// Get a [`PingType`](metrics/struct.PingType.html) by name. /// /// ## Return value /// /// Returns the `PingType` if a ping of the given name was registered before. /// Returns `None` otherwise. pub fn get_ping_by_name(&self, ping_name: &str) -> Option<&PingType> { self.ping_registry.get(ping_name) } /// Register a new [`PingType`](metrics/struct.PingType.html). pub fn register_ping_type(&mut self, ping: &PingType) { if self.ping_registry.contains_key(&ping.name) { log::error!("Duplicate ping named '{}'", ping.name) } self.ping_registry.insert(ping.name.clone(), ping.clone()); } /// Get create time of the Glean object. pub(crate) fn start_time(&self) -> DateTime<FixedOffset> { self.start_time } /// Indicate that an experiment is running. /// Glean will then add an experiment annotation to the environment /// which is sent with pings. This information is not persisted between runs. /// /// ## Arguments /// /// * `experiment_id` - The id of the active experiment (maximum 30 bytes). /// * `branch` - The experiment branch (maximum 30 bytes). /// * `extra` - Optional metadata to output with the ping. pub fn set_experiment_active( &self, experiment_id: String, branch: String, extra: Option<HashMap<String, String>>, ) { let metric = metrics::ExperimentMetric::new(&self, experiment_id); metric.set_active(&self, branch, extra); } /// Indicate that an experiment is no longer running. /// /// ## Arguments /// /// * `experiment_id` - The id of the active experiment to deactivate (maximum 30 bytes). pub fn set_experiment_inactive(&self, experiment_id: String) { let metric = metrics::ExperimentMetric::new(&self, experiment_id); metric.set_inactive(&self); } /// Persist Lifetime::Ping data that might be in memory /// in case `delay_ping_lifetime_io` is set or was set /// at a previous time. /// /// If there is no data to persist, this function does nothing. pub fn persist_ping_lifetime_data(&self) -> Result<()> { if let Some(data) = self.data_store.as_ref() { return data.persist_ping_lifetime_data(); } Ok(()) } /// Set internally-handled application lifetime metrics. fn set_application_lifetime_core_metrics(&self) { self.core_metrics.os.set(self, system::OS); } /// ** This is not meant to be used directly.** /// /// Clear all the metrics that have `Lifetime::Application`. pub fn clear_application_lifetime_metrics(&self) { log::debug!("Clearing Lifetime::Application metrics"); if let Some(data) = self.data_store.as_ref() { data.clear_lifetime(Lifetime::Application); } // Set internally handled app lifetime metrics again. self.set_application_lifetime_core_metrics(); } /// Return whether or not this is the first run on this profile. pub fn is_first_run(&self) -> bool { self.is_first_run } /// Set a debug view tag. /// /// This will return `false` in case `value` is not a valid tag. /// /// When the debug view tag is set, pings are sent with a `X-Debug-ID` header with the value of the tag /// and are sent to the ["Ping Debug Viewer"](https://mozilla.github.io/glean/book/dev/core/internal/debug-pings.html). /// /// ## Arguments /// /// * `value` - A valid HTTP header value. Must match the regex: "[a-zA-Z0-9-]{1,20}". pub fn set_debug_view_tag(&mut self, value: &str) -> bool { self.debug.debug_view_tag.set(value.into()) } /// Return the value for the debug view tag or `None` if it hasn't been set. /// /// The debug_view_tag may be set from an environment variable (GLEAN_DEBUG_VIEW_TAG) /// or through the `set_debug_view_tag` function. pub(crate) fn debug_view_tag(&self) -> Option<&String> { self.debug.debug_view_tag.get() } /// Set source tags. /// /// This will return `false` in case `value` contains invalid tags. /// /// Ping tags will show in the destination datasets, after ingestion. /// /// ## Arguments /// /// * `value` - A vector of at most 5 valid HTTP header values. Individual tags must match the regex: "[a-zA-Z0-9-]{1,20}". pub fn set_source_tags(&mut self, value: Vec<String>) -> bool { self.debug.source_tags.set(value) } /// Return the value for the source tags or `None` if it hasn't been set. /// /// The source_tags may be set from an environment variable (GLEAN_SOURCE_TAGS) /// or through the `set_source_tags` function. pub(crate) fn source_tags(&self) -> Option<&Vec<String>> { self.debug.source_tags.get() } /// Set the log pings debug option. /// /// This will return `false` in case we are unable to set the option. /// /// When the log pings debug option is `true`, /// we log the payload of all succesfully assembled pings. /// /// ## Arguments /// /// * `value` - The value of the log pings option pub fn set_log_pings(&mut self, value: bool) -> bool { self.debug.log_pings.set(value) } /// Return the value for the log pings debug option or `None` if it hasn't been set. /// /// The log_pings option may be set from an environment variable (GLEAN_LOG_PINGS) /// or through the `set_log_pings` function. pub(crate) fn log_pings(&self) -> bool { self.debug.log_pings.get().copied().unwrap_or(false) } fn get_dirty_bit_metric(&self) -> metrics::BooleanMetric { metrics::BooleanMetric::new(CommonMetricData { name: "dirtybit".into(), // We don't need a category, the name is already unique category: "".into(), send_in_pings: vec![INTERNAL_STORAGE.into()], lifetime: Lifetime::User, ..Default::default() }) } /// ** This is not meant to be used directly.** /// /// Set the value of a "dirty flag" in the permanent storage. /// The "dirty flag" is meant to have the following behaviour, implemented /// by the consumers of the FFI layer: /// /// - on mobile: set to `false` when going to background or shutting down, /// set to `true` at startup and when going to foreground. /// - on non-mobile platforms: set to `true` at startup and `false` at /// shutdown. /// /// At startup, before setting its new value, if the "dirty flag" value is /// `true`, then Glean knows it did not exit cleanly and can implement /// coping mechanisms (e.g. sending a `baseline` ping). pub fn set_dirty_flag(&self, new_value: bool) { self.get_dirty_bit_metric().set(self, new_value); } /// ** This is not meant to be used directly.** /// /// Check the stored value of the "dirty flag". pub fn is_dirty_flag_set(&self) -> bool { let dirty_bit_metric = self.get_dirty_bit_metric(); match StorageManager.snapshot_metric( self.storage(), INTERNAL_STORAGE, &dirty_bit_metric.meta().identifier(self), ) { Some(Metric::Boolean(b)) => b, _ => false, } } /// **Test-only API (exported for FFI purposes).** /// /// Check if an experiment is currently active. /// /// ## Arguments /// /// * `experiment_id` - The id of the experiment (maximum 30 bytes). /// /// ## Return value /// /// True if the experiment is active, false otherwise. pub fn test_is_experiment_active(&self, experiment_id: String) -> bool { self.test_get_experiment_data_as_json(experiment_id) .is_some() } /// **Test-only API (exported for FFI purposes).** /// /// Get stored data for the requested experiment. /// /// ## Arguments /// /// * `experiment_id` - The id of the active experiment (maximum 30 bytes). /// /// ## Return value /// /// If the requested experiment is active, a JSON string with the following format: /// { 'branch': 'the-branch-name', 'extra': {'key': 'value', ...}} /// Otherwise, None. pub fn test_get_experiment_data_as_json(&self, experiment_id: String) -> Option<String> { let metric = metrics::ExperimentMetric::new(&self, experiment_id); metric.test_get_value_as_json_string(&self) } /// **Test-only API (exported for FFI purposes).** /// /// Delete all stored metrics. /// Note that this also includes the ping sequence numbers, so it has /// the effect of resetting those to their initial values. pub fn test_clear_all_stores(&self) { if let Some(data) = self.data_store.as_ref() { data.clear_all() } // We don't care about this failing, maybe the data does just not exist. let _ = self.event_data_store.clear_all(); } } // Split unit tests to a separate file, to reduce the file of this one. #[cfg(test)] #[cfg(test)] #[path = "lib_unit_tests.rs"] mod tests;