fix: do not let a cold-start deep link become the router's location - #673
fix: do not let a cold-start deep link become the router's location#67321Mill wants to merge 5 commits into
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Opening a mostro: link while the app was not running crashed it before anything rendered: 'package:go_router/src/match.dart': Failed assertion: line 245 pos 12: 'uriPathToCompare.startsWith(newMatchedLocationToCompare)': is not true. With no activity alive, Android hands the link over as the engine's defaultRouteName rather than through pushRouteInformation, and go_router prefers that over initialLocation whenever it is not '/'. So the router started up trying to match mostro:<id>?relays=..., which is an opaque URI: its path is the bare id, with no leading slash, and matching it against '/' fails the assertion. The link never reached DeepLinkInterceptor, which guards the other delivery path, and the redirect that sends custom schemes home never ran either, since matching asserts before redirects are consulted. createRouter now sets overridePlatformDefaultLocation when the platform default carries a scheme of ours, so the app starts at '/' and the initial link is left to the handler in MostroApp that already reads it through app_links. The override is conditional rather than always on because on web the platform default is the location the user asked for, and discarding it would break opening the app at a URL. The "is this one of our schemes" test existed twice, in the interceptor and in the redirect, and this adds a third caller, so it now lives in one place as DeepLinkInterceptor.isCustomSchemeUri / isCustomSchemeLocation. Covered by a test that fakes the platform default through TestPlatformDispatcher: against the unfixed router it reports the initial location as the mostro: link itself, which is the defect exactly.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe router now recognizes custom-scheme platform locations during cold start. Deep-link handling buffers one URI until router and navigator context are ready, retries failed delivery, and uses structured logging. Tests cover scheme classification, router startup, initialization timing, interception, and retry behavior. ChangesDeep-link routing
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change prevents cold-start custom links from crashing the app, but overlapping links can still be dropped and some failed link processing may be cleared without retry. The PR is not fully merge-ready until these bounded reliability risks are fixed or explicitly accepted by the owner. Sequence Diagram(s)sequenceDiagram
participant AppLinks
participant MostroApp
participant GoRouter
participant Navigator
participant DeepLinkHandler
AppLinks->>MostroApp: provide initial or intercepted URI
MostroApp->>MostroApp: queue pending URI
MostroApp->>GoRouter: create router
MostroApp->>Navigator: wait for navigator context
MostroApp->>DeepLinkHandler: deliver pending URI
DeepLinkHandler->>Navigator: navigate for deep link
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation The changes address issue Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@lib/core/deep_link_interceptor.dart`:
- Around line 67-74: Update isCustomSchemeUri to recognize web schemes only when
uri.scheme exactly equals http or https, so schemes such as httpfoo are treated
as custom; add a regression test covering httpfoo:... through
isCustomSchemeLocation.
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isCustomSchemeUri asked whether the scheme starts with 'http', which the predicate it replaced already did in both of its copies. A scheme like httpfoo: passes that test, so such a link would be handed to go_router as an ordinary location and assert during a cold start, which is the failure this branch exists to remove. Uri normalises the scheme to lower case, so an exact comparison needs no case handling of its own; a test pins that rather than a defensive toLowerCase.
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Review: Request changes
Thanks for chasing down the go_router cold-start crash. The platform-default override itself looks like the right direction, and the http/https predicate fix is present on the current head.
I found one blocker before this closes #670:
- The PR now depends on
MostroApp._processInitialDeepLink()to deliver the initialmostro:URL aftercreateRouter()discards the platform default. However, that path schedules_handleInitialMostroLink()frominitState()and then gives up if_routeris still null after a post-frame callback plus a fixed 100 ms delay (lib/core/app.dart). WhileappInitializerProvideris still loading, the app renders the loadingMaterialApp, and_routeris only created later in thedatabranch. On a slow init path (Nostr/key/session startup), the crash is gone but the cold-start link can be silently dropped instead of opening the order. That still fails the issue's expected behavior.
Please make the initial URI durable until the router exists (for example, store the pending initial URI in state and drain it immediately after _router ??= createRouter(ref), or otherwise retry when the router is initialized), and add a regression test that covers the delayed-router case rather than only asserting the router starts at /.
Verification performed:
- Reviewed current head
ee2d212e522a0036f495993cf133a8157d43eda2against basec3c2d7a7b318e70b2d7555f43d49ef1bfc009624. - Read the PR body, linked issue #670, existing comments/review thread, and current CI state.
- Ran
git diff --checkon the changed files successfully. - Could not run
flutter testlocally because this environment does not haveflutteronPATH; GitHub'sbuildcheck is currently green for this head.
The router now starts at '/' on a cold start, so the link itself is delivered by _processInitialDeepLink(). That path waited one frame plus a fixed 100ms and gave up if the router was still null, which is exactly what happens while app initialization is in flight: the loading MaterialApp is on screen and the router has not been created yet. The crash was gone but the link could be dropped in silence. Store the link instead and hand it over on the first frame after the router exists, so a slow start delays the order screen rather than losing it.
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Good catch, and you are right: the review found a real hole that my own device testing had hidden. Once
On the test: I pulled the coordination into its own class precisely so the delayed-router case could be tested, and
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Inline comments:
In `@lib/core/app.dart`:
- Around line 93-108: Replace both debugPrint calls in the initial deep-link
error handlers, including _drainInitialLink, with the configured logger
singleton. Import the logger service package and log the existing error messages
and exception details through logger while preserving the current error-handling
flow.
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Applied in Note that one of the two,
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Review: Request changes
The cold-start deep-link fix itself looks sound now: the platform-default override is conditional, the http/https predicate is exact, and the initial mostro: URI is queued until the router exists.
I found one blocking test issue before this can merge:
test/core/initial_deep_link_queue_test.dartcreatesGoRouter(routes: []). This repository is pinned togo_router16.0.0, whose route configuration requires the routes list to be non-empty and to contain a route matching/. Flutter tests run with assertions enabled, so this fixture can fail before the queue assertions execute. Please give the test router a minimal root route (for exampleGoRoute(path: '/', builder: ...)) instead of an empty route list.
I could not run flutter test locally because this environment does not have Flutter/Dart installed, but the failure is visible from the checked-in pubspec.lock version and go_router's constructor contract.
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Review: Request changes
The diagnosis is correct and overridePlatformDefaultLocation is the right fix. My concern is commit 3 (InitialDeepLinkQueue): it only partially resolves the blocker from the previous review, and it reintroduces the same silent-drop in the opposite window.
Verification performed locally (this repo, PR head f1782ac):
flutter analyze lib/core test/core— 2 pre-existingcontainsSemanticsinfos only, no new issues.flutter test test/core/app_routes_test.dart test/core/deep_link_interceptor_test.dart test/core/initial_deep_link_queue_test.dart— 12/12 passing.- Read
go_router-16.0.0/lib/src/router.dart:546-571andpackages/flutter/lib/src/scheduler/binding.dart:788-802from the resolved SDK/lockfile.
🔴 HIGH-1 — addPostFrameCallback does not schedule a frame, so the link can still be dropped
lib/core/app.dart:101-113
void _drainInitialLink() {
if (!_initialLink.isPending) return;
WidgetsBinding.instance.addPostFrameCallback((_) async { ... });
}From scheduler/binding.dart:793-797:
This method does not request a new frame. […] Otherwise, the registered callback is executed after the next frame (whenever that may be, if ever).
Concrete failure path: appInitializerProvider resolves quickly (session already restored, relays cached), the data branch builds, the router is created, _drainInitialLink() runs with isPending == false and returns. The UI settles and stops requesting frames. Then appLinks.getInitialLink() (line 84) resolves → store() + _drainInitialLink() → a post-frame callback is registered with no frame scheduled → the callback never runs and the order never opens.
This is not hypothetical: line 92 executes inside a Future continuation with no frame in progress by construction. It is the same defect this PR exists to remove, just in the opposite timing window.
Minimal fix — request a frame so the callback is guaranteed to run:
WidgetsBinding.instance.addPostFrameCallback((_) async { ... });
WidgetsBinding.instance.ensureVisualUpdate();(or deliver synchronously when _router is already non-null).
🟠 MEDIUM-1 — The requested regression test is still missing
test/core/initial_deep_link_queue_test.dart exercises InitialDeepLinkQueue in isolation, and that class never had the bug. The defect lived in the _MostroAppState wiring: that _drainInitialLink() is invoked after _router ??= createRouter(ref) (app.dart:152) and survives the loading → data transition.
No test mounts MostroApp with appInitializerProvider in loading, resolves it to data, and asserts the link is delivered. Deleting line 152 entirely leaves all three new tests green — the test does not protect the fix.
The earlier request was specifically for "a regression test that covers the delayed-router case"; that is still open.
🟠 MEDIUM-2 — drain() clears the pending link before delivering it
lib/core/initial_deep_link_queue.dart:16-20
final uri = _pending;
if (uri == null || router == null) return;
_pending = null; // cleared BEFORE delivery
await deliver(uri, router);If deliver throws — app.dart:108 catches and only logs — the link is already discarded and there is no retry. In a change whose stated goal is "a slow start delays the order screen rather than losing it", the error path does the opposite. Clear _pending only after a successful await, or restore it in the catch.
🟠 MEDIUM-3 — The same bug class is left unfixed 40 lines above
lib/core/app.dart:64
_customUrlSubscription = _deepLinkInterceptor!.customUrlStream.listen(
(url) async {
if (_router != null) { ... } // dropped silently when null
},A link delivered through didPushRouteInformation while initialization is still in flight (process alive, MostroApp freshly mounted) is lost in exactly the same way. This PR introduces a reusable abstraction for precisely this and does not apply it here. If InitialDeepLinkQueue is the right answer, this branch should use it.
🟡 LOW-1 — Logger migration is incomplete
Commit 4 replaces 2 debugPrint calls, but 7 remain in app.dart (lines 61, 70, 75, 87, 160, 161, 176) — including line 87, inside the very method being changed. The file now mixes two logging conventions. Note debugPrint is not stripped in release, and line 87 dumps the full link (order id + relays).
🟡 LOW-2 — Version reference in the description does not match the lockfile
The PR body cites go_router-17.1.0/lib/src/router.dart:630-649. pubspec.lock pins 16.0.0, where the block is at router.dart:546-571. The logic is identical and the analysis holds, but the citation is not reproducible against this repo.
🟡 LOW-3 — InitialDeepLinkQueue is not a queue
It holds a single Uri and store() overwrites silently without signalling the discard. It also imports go_router solely for a parameter type, coupling a trivial holder to the router. A Uri? field on the State plus a _deliverPendingLink() method would cover the same ground without a new file or class — and would be equally testable if the test were at the widget level (see MEDIUM-1).
🟡 LOW-4 — Asymmetry between what is discarded and what is handled
isCustomSchemeUri claims any non-http(s) scheme, so createRouter discards the platform default for e.g. lightning:. But _processInitialDeepLink (line 86) only stores scheme == 'mostro'. Any custom scheme other than mostro: is discarded from the router and left unhandled. This is theoretical today — I verified AndroidManifest.xml declares only mostro as an inbound intent-filter (lightning is under <queries>, outbound) and Info.plist lists only mostro — but the 'claims other non-web schemes' test asserts a capability the app does not actually have.
✅ What is right
- The root-cause analysis is correct and verifiable: in go_router 16.0.0's
_effectiveInitialLocation, aplatformDefault != '/'wins overinitialLocation, andUri.parse('mostro:8927…')is opaque (hasEmptyPath == false), so it does not get normalised to/. - Making
overridePlatformDefaultLocationconditional is the right call:web/exists in this repo, and forcing it unconditionally would break opening the app at a URL. go_router's assert atrouter.dart:191requiresinitialLocation != null, which is satisfied. - The exact
http/httpsmatch in commit 2 is correct, and pinning theHTTPS://case againstUri's scheme normalisation rather than adding a defensivetoLowerCaseis the better choice. - Collapsing the predicate into one place instead of adding a third copy is a genuine improvement.
defaultRouteNameTestValueis the right way to reproduce the cold start without a device, and theisCustomSchemeLocationcases are thorough.
To unblock
- HIGH-1 —
ensureVisualUpdate()(or direct delivery when the router already exists). - MEDIUM-1 — a
testWidgetsthat mountsMostroAppwithappInitializerProviderinloading, resolves it todata, and asserts the link is delivered exactly once. - MEDIUM-2 — do not discard the link on the error path.
MEDIUM-3 and the LOW items are your call; MEDIUM-3 is worth doing because it is literally the same bug in a file this PR already touches.
addPostFrameCallback does not request a frame, so a link that arrived after the app had settled registered a callback that never ran. The handler needs the navigator anyway, so wait for it explicitly: deliver right away when it is mounted, and retry after the frame that mounts it otherwise, asking for that frame when the app is idle. The pending link now also survives a failed delivery and covers the intercepted stream, which dropped links while the router did not exist. Any custom scheme is queued, not only mostro:, matching what the router discards. The holder is a field on the state again: the delivery it guards is only observable through the widget, which is where the tests now are. Also moves the remaining debugPrint calls in the file to the logger.
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Thanks for the depth here — HIGH-1 and MEDIUM-1 were both real, and I verified each of your claims against the resolved SDK before touching anything. HIGH-1 — fixed, and the fix is not the one you suggestedYou are right that if (router.routerDelegate.navigatorKey.currentContext == null) {
WidgetsBinding.instance.addPostFrameCallback((_) { if (mounted) _deliverPendingDeepLink(); });
if (SchedulerBinding.instance.schedulerPhase == SchedulerPhase.idle) {
// A post frame callback does not request a frame on its own.
WidgetsBinding.instance.ensureVisualUpdate();
}
return;
}
_pendingDeepLink = null;
unawaited(_handleDeepLink(uri, router));Your late-arrival case now delivers immediately, with no frame involved at all. MEDIUM-1 — done, and checked by mutation
One caveat worth stating: the completers must be created inside the test body, not in MEDIUM-2 — fixedDelivery happens through a helper that restores the link on failure ( MEDIUM-3 — fixed
LOW items
Verification
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Device verification, now that I could get the phone connected again (OnePlus 8T, Android 14, debug build of Cold start — The ~0.9 s between detection and handling is the link sitting in App in foreground — the interceptor path, which is the window HIGH-1 was about, since the navigator is already mounted and nothing is asking for frames: Delivered in the same millisecond it arrived. Both paths fired here (initial link and interceptor) and Plain launch, no link — order book, no deep-link log lines at all. Not covered on device: a non- |
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Actionable comments posted: 11
🧩 Walkthrough
The root-cause analysis is right and I confirmed it locally on a0e4207d:
flutter analyze lib/core test/core→ 2 pre-existing infos only (containsSemanticsinautomation_contract_test.dart)flutter test test/core/app_deep_link_test.dart test/core/app_routes_test.dart test/core/deep_link_interceptor_test.dart→ 13/13 passing
Commits 1–2 (overridePlatformDefaultLocation + exact http/https matching) are solid, well-reasoned, and the app_routes_test.dart regression test is a real one. The findings below are all in the delivery layer added by commits 3 and 5.
Summary
| # | Severity | Location | Issue |
|---|---|---|---|
| 1 | 🔴 Critical | lib/core/app.dart:116-127 |
Retain-on-failure never fires against the real handler — link is dropped silently |
| 2 | 🟠 High | lib/core/app.dart:109 |
SchedulerPhase.idle guard is narrower than Flutter's contract; a chained retry may never get a frame |
| 3 | 🟡 Medium | lib/core/app.dart:93 |
_queueDeepLink overwrites a pending link with no log |
| 4 | 🟡 Medium | lib/core/app.dart:98 |
Missing mounted guard before ref.read |
| 5 | 🟡 Medium | lib/core/app_routes.dart:47-54 |
Discarded platform default is not used as a fallback source |
| 6 | 🟡 Medium | lib/core/deep_link_interceptor.dart:65 |
Router→interceptor dependency for a pure predicate; redundant private wrapper |
| 7 | 🔵 Low | lib/core/deep_link_interceptor.dart:71 |
Truncated doc comment |
| 8 | 🔵 Low | lib/core/app.dart:84 |
Unflagged scope widening from mostro: to any custom scheme |
| 9 | 🔵 Low | test/core/app_deep_link_test.dart:33 |
Fake's contract differs from DeepLinkHandler (pairs with #1) |
| 10 | 🔵 Low | test/core/app_deep_link_test.dart:127 |
Retry driven by an unrelated rebuild; >80 col |
| 11 | 🔵 Low | test/core/app_routes_test.dart:25 |
createRouter inside a Consumer.builder |
Verdict
Request changes on #1: the guarantee the last commit claims — "The pending link now also survives a failed delivery" — does not hold against DeepLinkHandler, which swallows every ordinary failure and returns normally. The test that backs it uses a double with a different contract, so it passes while the production path drops the link. #2 is a one-liner worth folding into the same push.
If you'd rather unblock the crash fix now, commits 1–2 stand on their own and could merge separately; as it stands commits 3–5 add a safety net that catches nothing.
Test coverage gaps
Not blocking, but the cases most likely to break are the ones not covered: a second link arriving while one is pending (#3), re-entrancy of _deliverPendingDeepLink (#2), and a custom-scheme platform default when app_links returns nothing (#5).
Note on formatting
dart format rewrites all four source files, but the whole repo is on the previous formatter style and there is no format gate in .github/workflows/, so this is not on you — except the one new >80 col line flagged inline.
| _pendingDeepLink = null; | ||
| unawaited(_handleDeepLink(uri, router)); | ||
| } | ||
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| Future<void> _handleDeepLink(Uri uri, GoRouter router) async { | ||
| try { | ||
| await ref.read(deepLinkHandlerProvider).handleInitialDeepLink(uri, router); | ||
| } catch (e, stack) { | ||
| // Keep the link so a later attempt can still open it. | ||
| _pendingDeepLink ??= uri; | ||
| logger.e('Error handling deep link', error: e, stackTrace: stack); | ||
| } |
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🔴 Potential issue | Critical
The pending link does not survive a failed delivery — it is dropped silently.
_pendingDeepLink is cleared before handing over, and is only restored if handleInitialDeepLink throws. It doesn't. DeepLinkHandler._handleDeepLink wraps everything in try { … } catch (e) { logger.e(…); _showErrorSnackBar(…) } (lib/core/deep_link_handler.dart:47-67) and returns normally on every real failure:
- order not found / relay down /
processMostroLinktimeout - unsupported scheme (
logger.w+ snackbar, no throw) processingContext == null→ barereturn(deep_link_handler.dart:99-103)- user declines the Mostro-switch dialog →
return(deep_link_handler.dart:126-129)
So in production the catch on line 124 is effectively unreachable and the link is discarded on the first failed attempt. The behaviour the commit message describes exists only against the test double.
Related, same root cause: _handleMostroDeepLink's concurrency guard (deep_link_handler.dart:80-83) also returns early with just a logger.i. Tap a second link while the first one's loading dialog is up and it is gone — the pending slot was already cleared.
Suggested fix: make retention depend on a result, not an exception — have handleInitialDeepLink return Future<bool> (or a DeepLinkResult) and keep the link when it reports failure. If that's out of scope for this PR, please drop _pendingDeepLink ??= uri and its test instead, since together they document a protection that isn't there.
| if (router.routerDelegate.navigatorKey.currentContext == null) { | ||
| WidgetsBinding.instance.addPostFrameCallback((_) { | ||
| if (mounted) _deliverPendingDeepLink(); | ||
| }); | ||
| if (SchedulerBinding.instance.schedulerPhase == SchedulerPhase.idle) { | ||
| // A post frame callback does not request a frame on its own. | ||
| WidgetsBinding.instance.ensureVisualUpdate(); | ||
| } | ||
| } catch (e) { | ||
| debugPrint('Error handling initial mostro link: $e'); | ||
| return; |
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🟠 Potential issue | High
The == idle guard is narrower than Flutter's own contract — this is the same failure mode commit 5 exists to remove.
From flutter/lib/src/scheduler/binding.dart:906-917, ensureVisualUpdate() calls scheduleFrame() for idle and postFrameCallbacks:
void ensureVisualUpdate() {
switch (schedulerPhase) {
case SchedulerPhase.idle:
case SchedulerPhase.postFrameCallbacks:
scheduleFrame();
return;
case SchedulerPhase.transientCallbacks:
case SchedulerPhase.midFrameMicrotasks:
case SchedulerPhase.persistentCallbacks:
return;
}
}When _deliverPendingDeepLink() re-enters from its own post-frame callback (navigator still null), the phase is postFrameCallbacks: a callback is registered for the next frame and no frame is requested. If nothing else asks for one, it never runs — precisely "addPostFrameCallback does not request a frame" from your own commit message.
Hard to hit today, since the Navigator normally mounts in the same frame as the router, so I'd call this plausible rather than confirmed. But the condition buys nothing: ensureVisualUpdate() already no-ops during transientCallbacks / midFrameMicrotasks / persistentCallbacks.
| if (router.routerDelegate.navigatorKey.currentContext == null) { | |
| WidgetsBinding.instance.addPostFrameCallback((_) { | |
| if (mounted) _deliverPendingDeepLink(); | |
| }); | |
| if (SchedulerBinding.instance.schedulerPhase == SchedulerPhase.idle) { | |
| // A post frame callback does not request a frame on its own. | |
| WidgetsBinding.instance.ensureVisualUpdate(); | |
| } | |
| } catch (e) { | |
| debugPrint('Error handling initial mostro link: $e'); | |
| return; | |
| if (router.routerDelegate.navigatorKey.currentContext == null) { | |
| WidgetsBinding.instance.addPostFrameCallback((_) { | |
| if (mounted) _deliverPendingDeepLink(); | |
| }); | |
| // A post frame callback does not request a frame on its own; | |
| // ensureVisualUpdate no-ops when one is already in flight. | |
| WidgetsBinding.instance.ensureVisualUpdate(); | |
| return; | |
| } |
This also lets you drop the package:flutter/scheduler.dart import added at the top of the file.
| void _queueDeepLink(Uri uri) { | ||
| _pendingDeepLink = uri; | ||
| _deliverPendingDeepLink(); | ||
| } |
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🟡 Refactor suggestion | Medium
A pending link is overwritten with no trace.
_pendingDeepLink = uri is unconditional. Two distinct links before the router exists — or one arriving while another delivery is in flight — and the first is lost with nothing in the log. A single slot is a defensible design, but it should say so out loud:
| void _queueDeepLink(Uri uri) { | |
| _pendingDeepLink = uri; | |
| _deliverPendingDeepLink(); | |
| } | |
| /// Keep the link until there is a router and a navigator to open it with | |
| void _queueDeepLink(Uri uri) { | |
| if (_pendingDeepLink != null && _pendingDeepLink != uri) { | |
| logger.w('Replacing pending deep link $_pendingDeepLink with $uri'); | |
| } | |
| _pendingDeepLink = uri; | |
| _deliverPendingDeepLink(); | |
| } |
| _deliverPendingDeepLink(); | ||
| } | ||
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| void _deliverPendingDeepLink() { |
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🟡 Potential issue | Medium
Can reach ref.read after dispose.
_processInitialDeepLink() is started unawaited from initState (line 47). If the widget unmounts while getInitialLink() is still pending and _router had already been assigned, the flow runs straight through to ref.read(deepLinkHandlerProvider) on a disposed ConsumerState. Unlikely for the root widget in production, but a classic flake source in widget tests.
The existing mounted check only covers the post-frame callback; an early guard closes the entry path too:
void _deliverPendingDeepLink() {
if (!mounted) return;
final uri = _pendingDeepLink;| if (initialUri != null && | ||
| DeepLinkInterceptor.isCustomSchemeUri(initialUri)) { | ||
| logger.i('Initial deep link detected: $initialUri'); | ||
| _queueDeepLink(initialUri); |
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🔵 Nitpick
Unflagged scope widening.
This path went from initialUri.scheme == 'mostro' to any non-web scheme, so anything getInitialLink() returns now reaches DeepLinkHandler, which answers with the red unsupportedLinkFormat snackbar for schemes it doesn't know.
I checked the manifests: lightning sits in <queries>, not an intent-filter, and iOS registers only mostro in CFBundleURLSchemes — so nothing else can actually arrive today and the risk is theoretical. Symmetry with what the router discards is the right target; just worth a line in the PR body, since it isn't mentioned.
| bool _isCustomScheme(Uri uri) { | ||
| return uri.scheme == 'mostro' || | ||
| (!uri.scheme.startsWith('http') && uri.scheme.isNotEmpty); | ||
| bool _isCustomScheme(Uri uri) => isCustomSchemeUri(uri); |
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🟡 Refactor suggestion | Medium
The router now depends on the interceptor for a pure predicate, and this wrapper is dead weight.
Deduplicating the three copies is the right call — the home isn't. app_routes.dart importing DeepLinkInterceptor just for two static bools inverts the natural direction: routing is the lower layer here, the interceptor is the consumer.
Extracting to lib/core/deep_link_schemes.dart (isCustomSchemeUri / isCustomSchemeLocation) makes all three callers symmetric and lets _isCustomScheme go away — with the static in scope it's now a pure alias over two call sites.
| static bool isCustomSchemeUri(Uri uri) => | ||
| uri.scheme.isNotEmpty && uri.scheme != 'http' && uri.scheme != 'https'; | ||
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| /// [isCustomSchemeUri] for an unparsed location; unparseable means no |
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🔵 Nitpick
The doc comment is cut off mid-sentence — unparseable means no is missing its noun.
| /// [isCustomSchemeUri] for an unparsed location; unparseable means no | |
| /// [isCustomSchemeUri] for an unparsed location; unparseable input is | |
| /// treated as not custom. |
| Future<void> handleInitialDeepLink(Uri uri, GoRouter router) async { | ||
| if (failures > 0) { | ||
| failures--; | ||
| throw StateError('delivery failed'); | ||
| } | ||
| handled.add(uri); | ||
| } |
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🔵 Nitpick — pairs with the critical comment on lib/core/app.dart:116
The double's contract differs from the collaborator it stands in for.
_RecordingHandler throws; DeepLinkHandler never does — it catches everything and returns normally. So this is what makes the retain-on-failure test pass while the production path drops the link on every real failure.
Once the retry is driven by a return value rather than an exception, this fake should model that (e.g. failures-- ; return false;) so the test exercises the path the app actually takes.
| // Any later rebuild of the app must find the link still there. | ||
| final container = | ||
| ProviderScope.containerOf(tester.element(find.byType(MostroApp))); | ||
| await container.read(settingsProvider.notifier).updateDefaultFiatCode('EUR'); |
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🔵 Nitpick
Two things here.
First, this is over 80 columns — the one genuinely new formatting violation in the PR (the rest of dart format's output is the repo-wide style drift, not yours).
Second, and more interesting: driving the retry with updateDefaultFiatCode('EUR') couples the test to an unrelated provider, and it enshrines the behaviour I'd push back on — a retained link fires on the next incidental rebuild, not on an explicit retry. Once #1 is fixed and links really do get retained, that means a link can open an order minutes after it failed, in the middle of whatever the user is doing. A TTL, or a bounded explicit retry, would be better than "whichever build happens next".
| Future<GoRouter> buildRouter(WidgetTester tester) async { | ||
| late GoRouter router; | ||
| await tester.pumpWidget( | ||
| ProviderScope( | ||
| overrides: [ | ||
| sharedPreferencesProvider.overrideWithValue(SharedPreferencesAsync()), | ||
| ], | ||
| child: Consumer( | ||
| builder: (context, ref, _) { | ||
| router = createRouter(ref); | ||
| return const SizedBox.shrink(); | ||
| }, | ||
| ), | ||
| ), | ||
| ); | ||
| return router; | ||
| } |
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🔵 Nitpick
createRouter(ref) runs inside a Consumer.builder, which may be invoked more than once — each pass constructs another GoRouter that nobody disposes, and the late router assignment quietly depends on build ordering.
A small StatefulWidget creating the router in initState, or a plain ProviderContainer + Consumer-free call, would make this deterministic. Not blocking — the assertions themselves are good, and I confirmed the first test does fail against the unfixed router.
2 participants
Closes #670
Problem
Opening a
mostro:link while the app was not running crashed it before anything rendered:With no activity alive, Android does not deliver the link through
pushRouteInformation: it hands it over as the engine'sdefaultRouteName. And go_router prefers that overinitialLocationwhenever it is not/(go_router-16.0.0/lib/src/router.dart:546-571):So the router started up trying to match
mostro:<id>?relays=…. That is an opaque URI: itspathis the bare id with no leading slash, so'8927…'.startsWith('/')is false and the assertion fires.This also explains why the two existing guards did not help.
DeepLinkInterceptorcovers thepushRouteInformationpath, which is not the one used here. And the redirect inapp_routes.dartthat sends custom schemes home never runs, because matching asserts before redirects are consulted.Change
createRoutersetsoverridePlatformDefaultLocationwhen the platform default carries one of our schemes, so the app starts at/and the initial link is left to_processInitialDeepLinkinMostroApp, which already reads it throughapp_linksand works.The override is conditional rather than always on: on web the platform default is the location the user actually asked for, and discarding it would break opening the app at a URL.
The "is this one of our schemes" test already existed twice — in the interceptor and in the redirect — and this would have added a third copy, so it now lives in one place as
DeepLinkInterceptor.isCustomSchemeUri/isCustomSchemeLocation.Tests
TestPlatformDispatcher.defaultRouteNameTestValuelets the cold start be reproduced without a device.test/core/app_routes_test.dart— a custom scheme handed over by the platform is ignored and the router starts at/; an ordinary launch starts at/; a real location like/settingsstill wins, which is the web case. Confirmed the first test fails against the unfixed router, reporting the initial location asmostro:8927bb1d-…itself — the defect exactly, not a proxy for it.test/core/deep_link_interceptor_test.dart—isCustomSchemeLocationovermostro:,lightning:, app locations, http(s) and unparseable input.Test plan
flutter analyzeonlib/coreandtest/core— no new issues (two pre-existingcontainsSemanticsdeprecation infos inautomation_contract_test.dart)flutter test test/core/— 51 passingflutter test— 896 passing, the same 11 pre-existing failures as onmain(staletest/mocks.mocks.dart, Dart run build_runner build fails on Flutter 3.44.0, source_gen 3.1.0 incompatible with analyzer 8.x #606)Note
Found while testing #669, which puts a
mostro:link behind a copy button on every takeable order — so links are about to become common. This PR is independent of that one and of #672, and applies tomainon its own.Summary by CodeRabbit
Bug Fixes
Tests