Add FwLite Mixpanel launch analytics MVP - #2606
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Send events over raw HTTP POST to Mixpanel /track from FwLiteShared. Debug and UseDevAssets builds use the hardcoded debug project token; release builds do not send until a production token exists. Failures are logged and never fail host startup.
Persist $device_id in preferences, identify from LexboxUser.Id on production lexbox.org login and at process start, and reset (new device id) on lexbox.org logout. Staging and local logins stay anonymous.
Register AppLaunchTracker as a hosted service so MAUI and FwLiteWeb send app_launched at process start with host maui or web, not on OS resume.
Tag authentication changes so Mixpanel identifies on login and resets only on logout. Store $user_id in preferences, rotate $device_id when a different user logs in, and read both ids on track so launches stay attributed when GetCurrentUser is unavailable. Introduce AnalyticsConfig for host and Mixpanel tokens, register AppLaunchTracker in FwLiteShared, and send Track on a background Task.Run.
OAuthClient construction needs the Kestrel listen address, which is not available while hosted services are still starting. IdentifyAtStart now waits on IHostApplicationLifetime when present; MAUI has none so it identifies immediately.
Capture event time and $insert_id at Track, use $os/$os_version/$app_version_string, and let host enrichers mutate the payload (Android $android_os_version on MAUI). Request Mixpanel geo via ip=1.
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📝 WalkthroughWalkthroughThe change adds Mixpanel analytics across shared, web, and MAUI backends. It adds authentication identity tracking, frontend privacy controls, generated service types, localization entries, analytics tests, and Vite temporary-file exclusions. ChangesAnalytics and privacy controls
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟠 High · up to This change adds persistent analytics identities and authentication-driven tracking, but the current implementation can attribute activity to the wrong account or share identity and opt-out state between concurrent web users, while the privacy text does not accurately describe production identification. These issues should be fixed before merging. Suggested reviewers: Poem
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| service.Identify("user-2"); | ||
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| var rotated = service.GetOrCreateDeviceId(); | ||
| rotated.Should().NotBe(originalDevice); |
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Why? Isn't the point of having both device and user IDs, because multiple users can use the same device?
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It would probably help to read the Mixpanel docs https://docs.mixpanel.com/docs/tracking-methods/id-management/identifying-users-simplified there's multiple methods, we are using the the Simplified ID Merge strategy.
The device ID only exists so that we can relate login (or pre auth) activity to the user after they login. We have both values sent so that mixpanel can merge the records from pre and post auth together. If the device ID were to not change, then mixpanel would get confused as to which user and device activity to merge together, I'm not sure what it would do because it's not designed to work that way (if we used their SDK then it would do this for us).
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An SDK, right....there's even a SIL package somewhere, right? I'm guessing you looked into those options a bit?
| /// <summary> | ||
| /// Mixpanel debug/test project token. Not a secret; hardcoded by design for this MVP. | ||
| /// </summary> | ||
| public const string DebugProjectToken = "5b901726cd330cf6fa1d270fe3c705e8"; |
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This is a real Mixpanel project ID/token? Are we not worried about spam etc?
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yeah it's real. It might make sense to inject at build time if that becomes a problem, but it'll be in the resulting binary either way.
Users can now disable (and re-enable) analytics. The choice is persisted in preferences (AnalyticsOptOut key) and gates all event sends in AnalyticsService. Opting out only stops network sends; stored analytics identity is left untouched. Adds GetAnalyticsEnabled/SetAnalyticsEnabled [JSInvokable] methods to IAnalyticsService and exposes the service to the viewer via FwLiteProvider. No UI toggle yet. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
New PrivacyDialog explains the anonymous usage data collection, links to the SIL privacy policy, and lets users opt out or back in via the analytics service. Opened from the home page overflow menu, a footer note on the home page, and the project sidebar's Help & More menu. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The single Times.Once check ran after both StartAsync and StopAsync, so it only proved the launch event fired once across both calls — not that Start triggered it or that Stop fired nothing. Verify once after Start, then again after Stop, to pin the count to the Start boundary. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Actionable comments posted: 4
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Inline comments:
In `@backend/FwLite/FwLiteShared/Analytics/AnalyticsIdentityListener.cs`:
- Around line 25-26: Update AnalyticsIdentityListener startup and
authentication-change handling around IdentifyAtStart and
OnAuthenticationChanged so concurrent GetCurrentUser operations cannot apply
stale identities after Logout; serialize identity mutations or validate
operation freshness before calling Identify, while preserving the correct final
logged-out state. Add a deterministic regression test covering Logout during
startup or login’s pending user lookup.
In `@backend/FwLite/FwLiteShared/Analytics/AnalyticsService.cs`:
- Around line 120-121: Update TrackAsync to acquire the identity lock once via
GetIdentitySnapshot(), store the resulting snapshot locally, and use that
snapshot for both the device ID and current user ID instead of reading them
separately. Add a deterministic interleaving test covering an Identify user
switch occurring during TrackAsync, verifying both analytics fields come from
the same snapshot.
In `@backend/FwLite/FwLiteShared/FwLiteSharedKernel.cs`:
- Line 33: Change the registrations around IAnalyticsService/AnalyticsService
and JsonFilePreferencesService from singleton to an appropriate user- or
circuit-scoped lifetime, ensuring mutable identity and preference state is not
shared across authenticated web circuits while preserving their existing
interfaces.
In `@frontend/viewer/src/lib/about/PrivacyDialog.svelte`:
- Line 38: Update the analytics disclosures in PrivacyDialog.svelte at line 38
and HomeView.svelte at line 276 to accurately state that lexbox.org logins
pseudonymously identify Mixpanel users via LexboxUser.Id rather than describing
data as anonymous. Regenerate the corresponding
frontend/viewer/src/locales/en.po and frontend/viewer/src/locales/es.po
translations.
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📒 Files selected for processing (38)
backend/FwLite/FwLiteMaui/FwLiteMauiKernel.csbackend/FwLite/FwLiteMaui/Services/MauiAnalyticsEventEnricher.csbackend/FwLite/FwLiteShared.Tests/Analytics/AnalyticsServiceTests.csbackend/FwLite/FwLiteShared.Tests/Auth/OAuthClientSilentRefreshTests.csbackend/FwLite/FwLiteShared/Analytics/AnalyticsConfig.csbackend/FwLite/FwLiteShared/Analytics/AnalyticsIdentityListener.csbackend/FwLite/FwLiteShared/Analytics/AnalyticsService.csbackend/FwLite/FwLiteShared/Analytics/AppLaunchTracker.csbackend/FwLite/FwLiteShared/Analytics/IAnalyticsEventEnricher.csbackend/FwLite/FwLiteShared/Analytics/IAnalyticsService.csbackend/FwLite/FwLiteShared/Analytics/MixpanelAnalytics.csbackend/FwLite/FwLiteShared/Auth/OAuthClient.csbackend/FwLite/FwLiteShared/Auth/OAuthService.csbackend/FwLite/FwLiteShared/Events/AuthenticationChangedEvent.csbackend/FwLite/FwLiteShared/FwLiteSharedKernel.csbackend/FwLite/FwLiteShared/Services/FwLiteProvider.csbackend/FwLite/FwLiteShared/Services/PreferenceKey.csbackend/FwLite/FwLiteShared/TypeGen/ReinforcedFwLiteTypingConfig.csbackend/FwLite/FwLiteWeb/FwLiteWebKernel.csfrontend/viewer/src/home/HomeView.sveltefrontend/viewer/src/lib/about/PrivacyDialog.sveltefrontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Analytics/IAnalyticsService.tsfrontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Events/AuthenticationChangeCause.tsfrontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Events/IAuthenticationChangedEvent.tsfrontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Events/index.tsfrontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Services/DotnetService.tsfrontend/viewer/src/lib/dotnet-types/generated-types/FwLiteShared/Services/PreferenceKey.tsfrontend/viewer/src/lib/services/service-provider.tsfrontend/viewer/src/locales/en.pofrontend/viewer/src/locales/es.pofrontend/viewer/src/locales/fr.pofrontend/viewer/src/locales/id.pofrontend/viewer/src/locales/ko.pofrontend/viewer/src/locales/ms.pofrontend/viewer/src/locales/sw.pofrontend/viewer/src/locales/vi.pofrontend/viewer/src/project/ProjectSidebar.sveltefrontend/viewer/vite.config.ts
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- Disclosure accuracy: drop the "anonymous" claim in the privacy dialog and home footer, since lexbox.org logins identify Mixpanel with the account id. - Read analytics identity as one locked snapshot in TrackAsync so a concurrent user switch can't tear an event into a mismatched device/user pair. - Serialize identity mutations in AnalyticsIdentityListener via a semaphore, fetching the current user inside the gate so a logout can't be overwritten by an in-flight startup/login lookup that resolves with a stale account. Adds a deterministic interleaving test for the listener race and a snapshot consistency test. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Release builds now send to the production Mixpanel project by default: AnalyticsConfig.ProductionToken defaults to the production token. Both the debug and production project tokens are stored base64-encoded and decoded at runtime, so no plaintext token string sits in the public repo for scrapers. These are write-only ingestion tokens, not secrets — the encoding only defeats casual scraping. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
…ytics # Conflicts: # backend/FwLite/FwLiteShared/TypeGen/ReinforcedFwLiteTypingConfig.cs
3 participants
related to #2383
Adds the starting point for tracking analytics, for now just starting with app launch. A follow up PR will be required to track everything in the main issue.
Opt out dialog:
privacy policy at https://software.sil.org/language-software-privacy-policy/
it's invoked from the home page overflow menu and a footer on the home page:
AI Summary
- Send Mixpanel `app_launched` once per FwLite MAUI and Web process start (not OS resume). - Track in debug builds with the hardcoded Mixpanel debug token; release does not send until a production token is configured. - Identify only for production `lexbox.org` using `LexboxUser.Id` as `$user_id`. Persist `$device_id` and `$user_id`. Mixpanel Reset only on explicit logout. - Event payload uses Mixpanel well-known properties: `$os`, `$os_version` (`RuntimeInformation.OSDescription`), `$app_version_string`, `time`, `$insert_id`. Host enrichers mutate the same dictionary (MAUI sets `$android_os_version` on Android). - Web identify waits until `ApplicationStarted` so OAuth redirect URL resolution does not race Kestrel addresses.Test plan
dotnet test backend/FwLite/FwLiteShared.Tests/FwLiteShared.Tests.csproj --filter "FullyQualifiedName~Analytics"app_launchedin Mixpanel debug projectapp_launchedin Mixpanel debug project