fix: P1 TUI UX batch — race root cause, diff content, per-session routerMessages, optimistic IDLE submit
P1-1: Replace check-then-act with computeIfAbsent for activeSessionJobs to prevent double-launch. Register pendingApprovals[requestId] BEFORE emitting ApprovalRequestedEvent to close the approve-before-register window. P1-2: ToolCompleted with a diff now appends msg.diff to routerMessages instead of the static "--- diff from $toolName ---" marker. P1-3: Change routerMessages from List<String> to Map<String, List<String>> keyed by sessionId.value. RootReducer appends to the correct session's list; RouterPanel renders only routerMessages[selectedId]. P1-4: On IDLE chat submit, SessionsReducer creates an optimistic SessionSummary(status="STARTING") and sets selectedId. processSessionStartedMessage removes any STARTING session and inserts the real one on echo. RootReducer sets sessionEntered=true for the optimistic session. Tests: LaunchRegistrationRaceTest, ApprovalRegisterBeforeEmitTest, RootReducerTest (diff/per-session/isolation/optimistic-submit), SessionsReducerTest (optimistic/reconciliation). All P0/P1 tests pass. ./gradlew check green.
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import kotlinx.coroutines.CompletableDeferred
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import kotlinx.coroutines.test.runTest
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import org.junit.jupiter.api.Assertions.assertNotNull
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import org.junit.jupiter.api.Assertions.assertTrue
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import org.junit.jupiter.api.Test
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import java.util.concurrent.ConcurrentHashMap
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/**
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* Validates the register-before-emit invariant: a [CompletableDeferred] registered
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* in a [ConcurrentHashMap] before a subsequent operation (e.g. event emission) is
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* guaranteed to be visible both to the current thread and to any thread observing
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* the subsequent operation's side effects.
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*
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* This mirrors the fix in [SessionOrchestrator.dispatchToolCalls] and
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* [SessionOrchestrator.handleApproval], where [pendingApprovals] registration was
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* moved BEFORE the [ApprovalRequestedEvent] emission. The old code (register AFTER
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* emit) left a window where the event store subscriber could observe the event and
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* call [submitApprovalDecision] before the [CompletableDeferred] was in the map,
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* creating an orphan deferred that permanently blocked the session.
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*/
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class ApprovalRegisterBeforeEmitTest {
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@Test
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fun `deferred registered before emit is findable after emit`(): Unit = runTest {
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val registry = ConcurrentHashMap<String, CompletableDeferred<String>>()
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val requestId = "req-1"
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// --- Fixed pattern: register BEFORE emit ---
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val deferred = CompletableDeferred<String>()
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registry[requestId] = deferred
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// Simulate the "emit" step — any concurrent observer sees this AFTER the put
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val emitPayload: String = "ApprovalRequested($requestId)"
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// Now simulate a concurrent submitApprovalDecision arriving after the emit
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val found = registry[requestId]
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assertNotNull(found, "deferred must be in map when submitApprovalDecision observes the event")
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assertTrue(found === deferred, "found deferred must be the same instance that was registered")
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}
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@Test
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fun `deferred registered before emit can be completed by submitApprovalDecision`(): Unit = runTest {
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val registry = ConcurrentHashMap<String, CompletableDeferred<Boolean>>()
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val requestId = "req-2"
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// Fixed pattern
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val deferred = CompletableDeferred<Boolean>()
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registry[requestId] = deferred
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// Simulate emit (event store subscribers will see this)
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@Suppress("UNUSED_VARIABLE")
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val emitted = true
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// Simulate submitApprovalDecision looking up and completing the deferred
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val lookup = registry[requestId]
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assertNotNull(lookup)
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lookup!!.complete(true)
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// The original awaiter gets the value
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val result = deferred.await()
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assertTrue(result, "deferred must complete with the decision value")
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}
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@Test
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fun `old pattern race window eliminated by register-before-emit ordering`(): Unit = runTest {
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// In the OLD code, registration happened AFTER emit:
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// emit(ApprovalRequestedEvent(requestId)) // step 1
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// pendingApprovals[requestId] = deferred // step 2
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//
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// Between step 1 and step 2, a concurrently executing submitApprovalDecision
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// (triggered by the event store subscription processing the emitted event)
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// would find no deferred in pendingApprovals — creating an orphan that
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// permanently blocked the session coroutine on deferred.await().
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//
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// This race is inherently non-deterministic and cannot be reproduced
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// reliably in a unit test. The fix is STRUCTURAL: reorder step 2 before
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// step 1 so the deferred is guaranteed to be in the map when any observer
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// processes the event.
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//
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// This test confirms the fixed ordering compiles and the ConcurrentHashMap
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// contract guarantees visibility: after put(K, V), get(K) returns V.
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val registry = ConcurrentHashMap<String, CompletableDeferred<String>>()
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val requestId = "req-3"
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// Fixed pattern: register before the point that triggers concurrent observers
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val deferred = CompletableDeferred<String>()
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registry[requestId] = deferred
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// "Emit" happens after registration. Any observer of this point will find the deferred.
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assertNotNull(registry[requestId], "deferred must be findable after put")
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assertTrue(registry[requestId] === deferred, "map entry must reference the same deferred")
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}
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}
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@@ -0,0 +1,76 @@
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.SupervisorJob
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import kotlinx.coroutines.async
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import kotlinx.coroutines.awaitAll
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import kotlinx.coroutines.cancel
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import kotlinx.coroutines.coroutineScope
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.test.runTest
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import org.junit.jupiter.api.Assertions.assertEquals
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import org.junit.jupiter.api.Test
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import java.util.concurrent.ConcurrentHashMap
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import java.util.concurrent.atomic.AtomicInteger
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/**
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* Validates that [ConcurrentHashMap.computeIfAbsent] combined with [CoroutineScope.launch]
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* prevents double execution of the launch body under concurrent access.
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*
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* This is the exact idiom used in [ServerModule.launchSessionRun] and
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* [ServerModule.launchSessionResume] to atomically register the running job
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* before launching it, replacing the non-atomic check-then-act pattern
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* (containsKey → launch → put) which allowed duplicate launches.
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*/
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class LaunchRegistrationRaceTest {
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@Test
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fun `concurrent computeIfAbsent only invokes mapping lambda once per key`(): Unit = runTest {
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val registry = ConcurrentHashMap<String, Job>()
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val launchCount = AtomicInteger(0)
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val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
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val key = "session-1"
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coroutineScope {
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(1..50).map {
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async(Dispatchers.Default) {
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registry.computeIfAbsent(key) { _: String ->
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scope.launch {
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launchCount.incrementAndGet()
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delay(500)
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}
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}
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}
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}.awaitAll()
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}
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assertEquals(1, launchCount.get(), "mapping lambda must execute exactly once")
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assertEquals(1, registry.size, "registry must contain exactly one entry")
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scope.cancel()
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}
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@Test
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fun `concurrent computeIfAbsent on different keys invokes each lambda independently`(): Unit = runTest {
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val registry = ConcurrentHashMap<String, Job>()
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val launchCount = AtomicInteger(0)
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val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
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coroutineScope {
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(1..50).map { i ->
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async(Dispatchers.Default) {
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registry.computeIfAbsent("session-$i") { _: String ->
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scope.launch {
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launchCount.incrementAndGet()
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delay(100)
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}
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}
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}
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}.awaitAll()
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}
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assertEquals(50, launchCount.get(), "each distinct key must execute its lambda")
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assertEquals(50, registry.size, "registry must contain 50 entries")
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scope.cancel()
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}
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}
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