1 files changed, 330 insertions, 0 deletions
diff --git a/toolkit/components/glean/src/init/mod.rs b/toolkit/components/glean/src/init/mod.rs
new file mode 100644
index 0000000000..8ca9297e5b
--- /dev/null
+++ b/toolkit/components/glean/src/init/mod.rs
@@ -0,0 +1,330 @@
+// 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/.
+
+use std::env;
+use std::ffi::CString;
+use std::ops::DerefMut;
+use std::path::PathBuf;
+
+use firefox_on_glean::{metrics, pings};
+#[cfg(target_os = "android")]
+use nserror::NS_ERROR_NOT_IMPLEMENTED;
+use nserror::{nsresult, NS_ERROR_FAILURE};
+use nsstring::{nsACString, nsCString, nsString};
+use xpcom::interfaces::{nsIFile, nsIPrefService, nsIProperties, nsIXULAppInfo, nsIXULRuntime};
+use xpcom::{RefPtr, XpCom};
+
+use glean::{ClientInfoMetrics, Configuration};
+
+#[cfg(not(target_os = "android"))]
+mod upload_pref;
+#[cfg(not(target_os = "android"))]
+mod user_activity;
+#[cfg(not(target_os = "android"))]
+mod viaduct_uploader;
+
+#[cfg(not(target_os = "android"))]
+use upload_pref::UploadPrefObserver;
+#[cfg(not(target_os = "android"))]
+use user_activity::UserActivityObserver;
+#[cfg(not(target_os = "android"))]
+use viaduct_uploader::ViaductUploader;
+
+/// Project FOG's entry point.
+///
+/// This assembles client information and the Glean configuration and then initializes the global
+/// Glean instance.
+#[cfg(not(target_os = "android"))]
+#[no_mangle]
+pub extern "C" fn fog_init(
+    data_path_override: &nsACString,
+    app_id_override: &nsACString,
+) -> nsresult {
+    let upload_enabled = static_prefs::pref!("datareporting.healthreport.uploadEnabled");
+    let recording_enabled = static_prefs::pref!("telemetry.fog.test.localhost_port") < 0;
+    let uploader = Some(Box::new(ViaductUploader) as Box<dyn glean::net::PingUploader>);
+
+    fog_init_internal(
+        data_path_override,
+        app_id_override,
+        upload_enabled || recording_enabled,
+        uploader,
+    )
+    .into()
+}
+
+/// Project FOG's entry point on Android.
+///
+/// This assembles client information and the Glean configuration and then initializes the global
+/// Glean instance.
+/// It always enables upload and set no uploader.
+/// This should only be called in test scenarios.
+/// In normal use Glean should be initialized and controlled by the Glean Kotlin SDK.
+#[cfg(target_os = "android")]
+#[no_mangle]
+pub extern "C" fn fog_init(
+    data_path_override: &nsACString,
+    app_id_override: &nsACString,
+) -> nsresult {
+    // On Android always enable Glean upload.
+    let upload_enabled = true;
+    // Don't set up an uploader.
+    let uploader = None;
+
+    fog_init_internal(
+        data_path_override,
+        app_id_override,
+        upload_enabled,
+        uploader,
+    )
+    .into()
+}
+
+fn fog_init_internal(
+    data_path_override: &nsACString,
+    app_id_override: &nsACString,
+    upload_enabled: bool,
+    uploader: Option<Box<dyn glean::net::PingUploader>>,
+) -> Result<(), nsresult> {
+    metrics::fog::initialization.start();
+
+    log::debug!("Initializing FOG.");
+
+    setup_observers()?;
+
+    let (mut conf, client_info) = build_configuration(data_path_override, app_id_override)?;
+
+    conf.upload_enabled = upload_enabled;
+    conf.uploader = uploader;
+
+    // If we're operating in automation without any specific source tags to set,
+    // set the tag "automation" so any pings that escape don't clutter the tables.
+    // See https://mozilla.github.io/glean/book/user/debugging/index.html#enabling-debugging-features-through-environment-variables
+    if env::var("MOZ_AUTOMATION").is_ok() && env::var("GLEAN_SOURCE_TAGS").is_err() {
+        log::info!("In automation, setting 'automation' source tag.");
+        glean::set_source_tags(vec!["automation".to_string()]);
+        log::info!("In automation, disabling MPS to avoid 4am issues.");
+        conf.use_core_mps = false;
+    }
+
+    log::debug!("Configuration: {:#?}", conf);
+
+    // Register all custom pings before we initialize.
+    pings::register_pings(Some(&conf.application_id));
+
+    glean::initialize(conf, client_info);
+
+    metrics::fog::initialization.stop();
+
+    Ok(())
+}
+
+fn build_configuration(
+    data_path_override: &nsACString,
+    app_id_override: &nsACString,
+) -> Result<(Configuration, ClientInfoMetrics), nsresult> {
+    let data_path_str = if data_path_override.is_empty() {
+        get_data_path()?
+    } else {
+        data_path_override.to_utf8().to_string()
+    };
+    let data_path = PathBuf::from(&data_path_str);
+
+    let (app_build, app_display_version, channel) = get_app_info()?;
+
+    let client_info = ClientInfoMetrics {
+        app_build,
+        app_display_version,
+        channel: Some(channel),
+    };
+    log::debug!("Client Info: {:#?}", client_info);
+
+    const SERVER: &str = "https://incoming.telemetry.mozilla.org";
+    let localhost_port = static_prefs::pref!("telemetry.fog.test.localhost_port");
+    let server = if localhost_port > 0 {
+        format!("http://localhost:{}", localhost_port)
+    } else {
+        String::from(SERVER)
+    };
+
+    let application_id = if app_id_override.is_empty() {
+        "firefox.desktop".to_string()
+    } else {
+        app_id_override.to_utf8().to_string()
+    };
+
+    let configuration = Configuration {
+        upload_enabled: false,
+        data_path,
+        application_id,
+        max_events: None,
+        delay_ping_lifetime_io: true,
+        server_endpoint: Some(server),
+        uploader: None,
+        use_core_mps: true,
+        trim_data_to_registered_pings: true,
+        log_level: None,
+    };
+
+    Ok((configuration, client_info))
+}
+
+#[cfg(not(target_os = "android"))]
+fn setup_observers() -> Result<(), nsresult> {
+    if let Err(e) = UploadPrefObserver::begin_observing() {
+        log::error!(
+            "Could not observe data upload pref. Abandoning FOG init due to {:?}",
+            e
+        );
+        return Err(e);
+    }
+
+    if let Err(e) = UserActivityObserver::begin_observing() {
+        log::error!(
+            "Could not observe user activity. Abandoning FOG init due to {:?}",
+            e
+        );
+        return Err(e);
+    }
+
+    Ok(())
+}
+
+#[cfg(target_os = "android")]
+fn setup_observers() -> Result<(), nsresult> {
+    // No observers are set up on Android.
+    Ok(())
+}
+
+/// Construct and return the data_path from the profile dir, or return an error.
+fn get_data_path() -> Result<String, nsresult> {
+    let dir_svc: RefPtr<nsIProperties> = match xpcom::components::Directory::service() {
+        Ok(ds) => ds,
+        _ => return Err(NS_ERROR_FAILURE),
+    };
+    let mut profile_dir = xpcom::GetterAddrefs::<nsIFile>::new();
+    unsafe {
+        dir_svc
+            .Get(
+                cstr!("ProfD").as_ptr(),
+                &nsIFile::IID,
+                profile_dir.void_ptr(),
+            )
+            .to_result()?;
+    }
+    let profile_dir = profile_dir.refptr().ok_or(NS_ERROR_FAILURE)?;
+    let mut profile_path = nsString::new();
+    unsafe {
+        (*profile_dir).GetPath(&mut *profile_path).to_result()?;
+    }
+    let profile_path = String::from_utf16(&profile_path[..]).map_err(|_| NS_ERROR_FAILURE)?;
+    let data_path = profile_path + "/datareporting/glean";
+    Ok(data_path)
+}
+
+/// Return a tuple of the build_id, app version, and build channel.
+/// If the XUL Runtime isn't a XULAppInfo (e.g. in xpcshell),
+/// build_id ad app_version will be "unknown".
+/// Other problems result in an error being returned instead.
+fn get_app_info() -> Result<(String, String, String), nsresult> {
+    let xul: RefPtr<nsIXULRuntime> =
+        xpcom::components::XULRuntime::service().map_err(|_| NS_ERROR_FAILURE)?;
+
+    let pref_service: RefPtr<nsIPrefService> =
+        xpcom::components::Preferences::service().map_err(|_| NS_ERROR_FAILURE)?;
+    let branch = xpcom::getter_addrefs(|p| {
+        // Safe because:
+        //  * `null` is explicitly allowed per documentation
+        //  * `p` is a valid outparam guaranteed by `getter_addrefs`
+        unsafe { pref_service.GetDefaultBranch(std::ptr::null(), p) }
+    })?;
+    let pref_name = CString::new("app.update.channel").map_err(|_| NS_ERROR_FAILURE)?;
+    let mut channel = nsCString::new();
+    // Safe because:
+    //  * `branch` is non-null (otherwise `getter_addrefs` would've been `Err`
+    //  * `pref_name` exists so a pointer to it is valid for the life of the function
+    //  * `channel` exists so a pointer to it is valid, and it can be written to
+    unsafe {
+        if (*branch)
+            .GetCharPref(pref_name.as_ptr(), channel.deref_mut() as *mut nsACString)
+            .to_result()
+            .is_err()
+        {
+            channel = "unknown".into();
+        }
+    }
+
+    let app_info = match xul.query_interface::<nsIXULAppInfo>() {
+        Some(ai) => ai,
+        // In e.g. xpcshell the XULRuntime isn't XULAppInfo.
+        // We still want to return sensible values so tests don't explode.
+        _ => {
+            return Ok((
+                "unknown".to_owned(),
+                "unknown".to_owned(),
+                channel.to_string(),
+            ))
+        }
+    };
+
+    let mut build_id = nsCString::new();
+    unsafe {
+        app_info.GetAppBuildID(&mut *build_id).to_result()?;
+    }
+
+    let mut version = nsCString::new();
+    unsafe {
+        app_info.GetVersion(&mut *version).to_result()?;
+    }
+
+    Ok((
+        build_id.to_string(),
+        version.to_string(),
+        channel.to_string(),
+    ))
+}
+
+/// **TEST-ONLY METHOD**
+/// Resets FOG and the underlying Glean SDK, clearing stores.
+#[cfg(not(target_os = "android"))]
+#[no_mangle]
+pub extern "C" fn fog_test_reset(
+    data_path_override: &nsACString,
+    app_id_override: &nsACString,
+) -> nsresult {
+    fog_test_reset_internal(data_path_override, app_id_override).into()
+}
+
+// Split out into its own function so I could use `?`
+#[cfg(not(target_os = "android"))]
+fn fog_test_reset_internal(
+    data_path_override: &nsACString,
+    app_id_override: &nsACString,
+) -> Result<(), nsresult> {
+    let (mut conf, client_info) = build_configuration(data_path_override, app_id_override)?;
+
+    let upload_enabled = static_prefs::pref!("datareporting.healthreport.uploadEnabled");
+    let recording_enabled = static_prefs::pref!("telemetry.fog.test.localhost_port") < 0;
+    conf.upload_enabled = upload_enabled || recording_enabled;
+
+    // Don't accidentally send "main" pings during tests.
+    conf.use_core_mps = false;
+
+    // I'd prefer to reuse the uploader, but it gets moved into Glean so we build anew.
+    conf.uploader = Some(Box::new(ViaductUploader) as Box<dyn glean::net::PingUploader>);
+
+    glean::test_reset_glean(conf, client_info, true);
+    Ok(())
+}
+
+/// **TEST-ONLY METHOD**
+/// Does nothing on Android. Returns NS_ERROR_NOT_IMPLEMENTED.
+#[cfg(target_os = "android")]
+#[no_mangle]
+pub extern "C" fn fog_test_reset(
+    _data_path_override: &nsACString,
+    _app_id_override: &nsACString,
+) -> nsresult {
+    NS_ERROR_NOT_IMPLEMENTED
+}