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package io.dico.dicore.command.registration.reflect
import io.dico.dicore.command.CommandException
import io.dico.dicore.command.EMessageType
import io.dico.dicore.command.ExecutionContext
import io.dico.dicore.command.ICommandReceiver
import kotlinx.coroutines.CoroutineStart.UNDISPATCHED
import kotlinx.coroutines.Deferred
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.async
import java.lang.reflect.Method
import java.util.concurrent.CancellationException
import kotlin.coroutines.CoroutineContext
import kotlin.coroutines.intrinsics.intercepted
import kotlin.coroutines.intrinsics.suspendCoroutineUninterceptedOrReturn
import kotlin.reflect.jvm.kotlinFunction
fun isSuspendFunction(method: Method): Boolean {
val func = method.kotlinFunction ?: return false
return func.isSuspend
}
fun callAsCoroutine(
command: ReflectiveCommand,
factory: ICommandReceiver.Factory,
context: ExecutionContext,
args: Array<Any?>
): String? {
// UNDISPATCHED causes the handler to run until the first suspension point on the current thread,
// meaning command handlers that don't have suspension points will run completely synchronously.
// Tasks that take time to compute should suspend the coroutine and resume on another thread.
val job = GlobalScope.async(context = factory.coroutineContext as CoroutineContext, start = UNDISPATCHED) {
suspendCoroutineUninterceptedOrReturn<Any?> { cont ->
command.method.invoke(command.instance, *args, cont.intercepted())
}
}
if (job.isCompleted) {
return job.getResult()
}
job.invokeOnCompletion {
val cc = context.address.chatController
try {
val result = job.getResult()
cc.sendMessage(context.sender, EMessageType.RESULT, result)
} catch (ex: Throwable) {
cc.handleException(context.sender, context, ex)
}
}
return null
}
@Throws(CommandException::class)
private fun Deferred<Any?>.getResult(): String? {
getCompletionExceptionOrNull()?.let { ex ->
if (ex is CancellationException) {
System.err.println("An asynchronously dispatched command was cancelled unexpectedly")
ex.printStackTrace()
throw CommandException("The command was cancelled unexpectedly (see console)")
}
if (ex is Exception) return ReflectiveCommand.getResult(null, ex)
throw ex
}
return ReflectiveCommand.getResult(getCompleted(), null)
}
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