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fix: guard concurrent startPayment calls on Android and in the hook - #29
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- Android: reject a second startPayment while one is in flight with "A payment is already in progress" instead of overwriting the stored promise. The pending slot is atomic because startPayment runs on the JS thread and onActivityResult on the main thread. - Hook: add a synchronous in-flight ref guard so two calls in the same frame start one native payment; reset() no longer clears isProcessing. - Share one PaymentHandler instance between the hook and the exported HybridPaymentHandler, so the native per-instance guard covers both. Closes #8
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📝 Summary
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 26.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 9 files. (1 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title uses the required fix: prefix and clearly describes the main change. It exceeds the suggested 50-character length, but it remains concise and descriptive. Description check The description directly explains the Android and hook concurrency guards, shared handler behavior, documentation updates, tests, and known risks. Linked Issues check Issue #8coding requirements are met. Android usesPendingPaymentwith an atomic claim, rejects overlap withA payment is already in progress, and does not replace the active callback. The hook us…Out of Scope Changes check The Kotlin, TypeScript, tests, constants, and documentation changes directly implement or verify issue #8. The shared handler accessor supports the required hook and direct-handler behavior. No unrela…Security Check No medium, high, or critical security vulnerability is introduced. The diff adds only payment concurrency control, a cached handler accessor, an error constant, and tests/docs. The new paths do not ad… Full details: Linked Issues check
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Explanation
Issue
#8coding requirements are met. Android usesPendingPaymentwith an atomic claim, rejects overlap withA payment is already in progress, and does not replace the active callback. The hook uses a synchronous guard and keeps it active throughreset().getPaymentHandler()shares one handler between the hook andHybridPaymentHandler. Jest tests cover synchronous overlap, reset, rejection, and shared calls. JUnit tests cover atomic claim and settlement behavior. The unrun manual double-tap check does not block this coding assessment.
Full details: Out of Scope Changes check
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Explanation
The Kotlin, TypeScript, tests, constants, and documentation changes directly implement or verify issue
#8. The shared handler accessor supports the required hook and direct-handler behavior. No unrelated change is demonstrated.
Full details: Security Check
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Explanation
No medium, high, or critical security vulnerability is introduced. The diff adds only payment concurrency control, a cached handler accessor, an error constant, and tests/docs. The new paths do not add authentication, authorization, deserialization, network, filesystem, or secret-handling sinks. Android now rejects overlapping calls through an atomic slot, and the hook shares the existing handler; these changes reduce duplicate-payment risk. The prior unresolved review thread concerns functional hook state, not a security vulnerability.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 26.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 9 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Inline comments:
Review comments at @package/src/hooks/usePaymentCheckout.ts:
- Line 282: Coordinate the in-flight claim used by the payment hook with
HybridPaymentHandler and other entry points before changing hook state; when
another entry point already owns the payment, reject without setting
isProcessing or clearing or storing hook results and errors. Update the
direct-first test to expect that hook state remains unchanged.
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📒 Files selected for processing: 12
docs/docs/api/hybrid-payment-handler.mddocs/docs/api/use-payment-checkout.mdpackage/android/build.gradlepackage/android/src/main/java/com/margelo/nitro/pay/Constants.ktpackage/android/src/main/java/com/margelo/nitro/pay/HybridPaymentHandler.ktpackage/android/src/main/java/com/margelo/nitro/pay/PendingPayment.ktpackage/android/src/test/java/com/margelo/nitro/pay/PendingPaymentTest.ktpackage/src/__tests__/paymentHandler.test.tspackage/src/hooks/__tests__/usePaymentCheckout.integration.test.tspackage/src/hooks/usePaymentCheckout.tspackage/src/index.tspackage/src/paymentHandler.ts
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The hook ignores overlaps with its own in-flight payment without touching state. A payment started through HybridPaymentHandler or another hook instance is rejected natively, and the hook records that like any failed payment. Spell this out instead of claiming hook state is never affected.
…payment # Conflicts: # package/android/build.gradle
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1 participant
Closes #8
Summary
startPaymentwhile one is in flight now resolves immediately with{ success: false, error: "A payment is already in progress" }(same message as iOS). It no longer overwrites the stored promise or requests a second Google Pay sheet. The pending slot lives in a smallPendingPaymentclass backed by anAtomicReference, becausestartPaymentruns on the JS thread andonActivityResulton the main thread.usePaymentCheckout().startPaymenthas a synchronoususeRefin-flight guard, so two calls in the same frame start one native payment. An overlap with the hook's own payment returns the in-progress result and does not touch hook state. A payment started elsewhere (HybridPaymentHandleror another hook instance) is rejected natively, and the hook records it inresult/errorlike any failed payment.reset()no longer clearsisProcessing.HybridPaymentHandlernow share onePaymentHandler(internalsrc/paymentHandler.ts,getPaymentHandler()). This means the existing iOS guard also covers hook + direct calls. Swift is unchanged.use-payment-checkout.md(in-progress result, newreset()behavior) andhybrid-payment-handler.md(one payment at a time).Test plan
cd package && bun run typecheck: passescd package && bunx eslint src: passescd package && bun run test: 34/34 pass. The 5 new tests fail onmain.startPayment()calls lead to one native call, and the second returns the in-progress result.reset()mid-flight keepsisProcessingand the guard. The guard is released after a native rejection.HybridPaymentHandleruse the same native object. A direct call during a hook payment gets the in-progress result. A hook call during a direct payment gets it too, and the hook records it inresult/error.PendingPaymentTest: 6/6 pass. Run with./gradlew :gmisoftware_react-native-pay:testDebugUnitTestfromexample/android, which also compiles the changedHybridPaymentHandler.kt.bun run docs:build: passescd example && bunx expo run:ios: not runcd example && bunx expo run:android: not runGooglePayButtonin the example app (TEST environment): not runRisk
reset()no longer clearsisProcessing. Apps that usedreset()to clear a stuck spinner now have to wait for the native sheet to settle.onActivityResultnever arrives (e.g. the activity is destroyed under the Google Pay sheet), the Android handler stays "in progress" until the app restarts. Before, the next call silently overwrote the stored promise. iOS has had the same exposure since 0.0.17.android/src/test/ships in the npm tarball becausefilesincludesandroid/src. This matches the JS__tests__that are already published.junitis declared astestImplementation, so a consumer's root./gradlew testresolves it.Notes
expois a required peer #24's scope, andgetPaymentHandler()is the seam for that.PAYMENT_IN_PROGRESS_ERRORis internal and not exported.NitroModules.createHybridObject('PaymentHandler')directly is not covered.Need help on this PR? Tag
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