Fix `syncFromEvent`, add Tests

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/event/linear.kt

@@ -15,7 +15,6 @@ import kotlinx.coroutines.*
 import net.mamoe.mirai.utils.SinceMirai
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
-import kotlin.coroutines.suspendCoroutine
 import kotlin.jvm.JvmSynthetic
 import kotlin.reflect.KClass
 
@@ -37,7 +36,16 @@ suspend inline fun <reified E : Event, R : Any> syncFromEvent(
     noinline mapper: suspend E.(E) -> R? // 不要 crossinline: crossinline 后 stacktrace 会不正常
 ): R {
     require(timeoutMillis == -1L || timeoutMillis > 0) { "timeoutMillis must be -1 or > 0" }
-    return syncFromEventOrNull(timeoutMillis, mapper) ?: error("timeout $timeoutMillis ms asyncFromEvent")
+
+    return if (timeoutMillis == -1L) {
+        coroutineScope {
+            syncFromEventImpl<E, R>(E::class, this, mapper)
+        }
+    } else {
+        withTimeout(timeoutMillis) {
+            syncFromEventImpl<E, R>(E::class, this, mapper)
+        }
+    }
 }
 
 /**
@@ -54,19 +62,13 @@ suspend inline fun <reified E : Event, R : Any> syncFromEvent(
 @JvmSynthetic
 @SinceMirai("0.38.0")
 suspend inline fun <reified E : Event, R : Any> syncFromEventOrNull(
-    timeoutMillis: Long = -1,
+    timeoutMillis: Long,
     noinline mapper: suspend E.(E) -> R? // 不要 crossinline: crossinline 后 stacktrace 会不正常
 ): R? {
-    require(timeoutMillis == -1L || timeoutMillis > 0) { "timeoutMillis must be -1 or > 0" }
+    require(timeoutMillis > 0) { "timeoutMillis must be > 0" }
 
-    return if (timeoutMillis == -1L) {
-        coroutineScope {
-            syncFromEventOrNullImpl<E, R>(E::class, this, mapper)
-        }
-    } else {
-        withTimeoutOrNull(timeoutMillis) {
-            syncFromEventOrNullImpl<E, R>(E::class, this, mapper)
-        }
+    return withTimeoutOrNull(timeoutMillis) {
+        syncFromEventImpl<E, R>(E::class, this, mapper)
     }
 }
 
@@ -83,7 +85,7 @@ suspend inline fun <reified E : Event, R : Any> syncFromEventOrNull(
 @Suppress("DeferredIsResult")
 @SinceMirai("0.38.0")
 inline fun <reified E : Event, R : Any> CoroutineScope.asyncFromEventOrNull(
-    timeoutMillis: Long = -1,
+    timeoutMillis: Long,
     coroutineContext: CoroutineContext = EmptyCoroutineContext,
     noinline mapper: suspend E.(E) -> R? // 不要 crossinline: crossinline 后 stacktrace 会不正常
 ): Deferred<R?> {
@@ -123,11 +125,11 @@ inline fun <reified E : Event, R : Any> CoroutineScope.asyncFromEvent(
 //////////////
 
 @PublishedApi
-internal suspend fun <E : Event, R> syncFromEventOrNullImpl(
+internal suspend fun <E : Event, R> syncFromEventImpl(
     eventClass: KClass<E>,
     coroutineScope: CoroutineScope,
     mapper: suspend E.(E) -> R?
-): R? = suspendCoroutine { cont ->
+): R = suspendCancellableCoroutine { cont ->
     coroutineScope.subscribe(eventClass) {
         cont.resumeWith(kotlin.runCatching {
             mapper.invoke(this, it) ?: return@subscribe ListeningStatus.LISTENING

mirai-core/src/commonTest/kotlin/net/mamoe/mirai/message/SubscribingGetTest.kt

+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.message
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.TimeoutCancellationException
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withTimeout
+import net.mamoe.mirai.event.TestEvent
+import net.mamoe.mirai.event.broadcast
+import net.mamoe.mirai.event.syncFromEvent
+import net.mamoe.mirai.test.runBlocking
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
+import kotlin.coroutines.resume
+import kotlin.coroutines.suspendCoroutine
+import kotlin.test.Test
+import kotlin.test.assertFailsWith
+
+internal class SubscribingGetTest {
+
+    @Test
+    fun testSyncFromEvent(): Unit = runBlocking {
+        withTimeout(500) {
+            suspendCoroutine<Unit> { cont ->
+                launch {
+                    syncFromEvent(5000) { _: TestEvent ->
+                        cont.resume(Unit)
+                    }
+                }
+                launch {
+                    TestEvent().broadcast()
+                }
+            }
+        }
+    }
+
+    @Test
+    fun testSyncFromEventTimeout() {
+        runBlockingWithTimeout(500) {
+            assertFailsWith<TimeoutCancellationException> {
+                syncFromEvent(100) { _: TestEvent -> }
+            }
+        }
+    }
+}
+
+internal fun <R> runBlockingWithTimeout(
+    millis: Long,
+    context: CoroutineContext = EmptyCoroutineContext,
+    block: suspend CoroutineScope.() -> R
+): R = runBlocking(context) {
+    withTimeout(millis, block)
+}
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