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rpc: Fix deadlock caused by deliver() and close()

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This commit is contained in:
Andras Slemmer 2017-03-08 17:03:25 +00:00
parent a394adbb44
commit 60520412c8
1 changed files with 23 additions and 18 deletions
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9
node/src/main/kotlin/net/corda/node/services/messaging/CordaRPCClientImpl.kt
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@ -284,6 +284,10 @@ class CordaRPCClientImpl(private val session: ClientSession,
private val rootShared = root.doOnUnsubscribe { close() }.share()
// This could be made more efficient by using a specialised IntMap
/**
* When handling this map we synchronise on it explicitly instead of on [this], otherwise there is a race
* condition between close() and deliver()
*/
private val observables = HashMap<Int, Observable<Any>>()
private var consumer: ClientConsumer? = null
@ -320,8 +324,8 @@ class CordaRPCClientImpl(private val session: ClientSession,
}
}
@Synchronized
fun getForHandle(handle: Int): Observable<Any> {
synchronized(observables) {
return observables.getOrPut(handle) {
/**
* Note that the order of bufferUntilSubscribed() -> dematerialize() is very important here.
@ -340,13 +344,14 @@ class CordaRPCClientImpl(private val session: ClientSession,
rootShared.filter { it.forHandle == handle }.map { it.what }.bufferUntilSubscribed().dematerialize<Any>().doOnSubscribe { refCountUp() }.doOnUnsubscribe { refCountDown() }.share()
}
}
}
private fun deliver(msg: ClientMessage) {
msg.acknowledge()
val kryo = createRPCKryo(observableSerializer = observableDeserializer)
val received: MarshalledObservation = msg.deserialize(kryo)
rpcLog.debug { "<- Observable [$rpcName] <- Received $received" }
synchronized(this) {
synchronized(observables) {
// Force creation of the buffer if it doesn't already exist.
getForHandle(received.forHandle)
root.onNext(received)