ArrayIndexOutOfBoundsException during unsubscribe

[satyarajrapido]

@deepanshu42 I was observing a crash in Coordinator due to the following code in the SDK, if you see the block topics.size == 1 it would unsubscribe to the first topic, which is fine, but let's say, the topic size is zero, then the else querying the topics[0] will throw ArrayIndexOutOfBoundsException,

This is the same even for subscribeAll too, please check

override fun unsubscribe(stubMethod: StubMethod.Unsubscribe, args: Array<Any>): Any {
        logger.d("Coordinator", "Unsubscribe method invoked")
        stubMethod.argumentProcessor.inject(args)
        val topics = stubMethod.argumentProcessor.getTopics()
        val status = if (topics.size == 1) {
            client.unsubscribe(topics[0])
        } else {
            client.unsubscribe(topics[0], *topics.sliceArray(IntRange(1, topics.size - 1)))
        }
        logger.d("Coordinator", "Unsubscribing topics: $topics")
        return status
    }

Crash stacktrace

Fatal Exception: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
       at com.gojek.courier.coordinator.Coordinator.unsubscribe(Coordinator.kt:133)
       at com.gojek.courier.stub.StubInterface.invoke(StubInterface.kt:32)
       at com.gojek.courier.stub.ProxyFactory.createInvocationHandler$lambda-0(ProxyFactory.kt:41)
       at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
       at $Proxy48.unsubscribe()
       at okyi.okyi.okyi.XNkf.kDyL.OEVx.OEVx.HVAU$IwUN.invokeSuspend(OperatorImpl.kt:21)
       at okyi.okyi.okyi.XNkf.kDyL.OEVx.OEVx.HVAU$IwUN.invoke(OperatorImpl.kt:2)
       at kotlinx.coroutines.flow.ChannelFlowBuilder.collectTo$suspendImpl(Builders.kt:320)
       at kotlinx.coroutines.flow.ChannelFlowBuilder.collectTo(Builders.kt)
       at kotlinx.coroutines.flow.CallbackFlowBuilder.collectTo(Builders.kt:334)
       at kotlinx.coroutines.flow.internal.ChannelFlow$collectToFun$1.invokeSuspend(ChannelFlow.kt:60)
       at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
       at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:108)
       at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:115)
       at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:103)
       at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:793)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:697)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt)