CORDA-2615 - add fix for serialization failure on relevancy check.

CORDA-2615 - add fix for serialization failure on relevancy check.

CORDA-2615 - add fix for serialization failure on relevancy check.

CORDA-2615 - add fix for serialization failure on relevancy check.

CORDA-2615 - fix test

Create reconnecting proxies

core/src/main/kotlin/net/corda/core/transactions/LedgerTransaction.kt

@@ -28,12 +28,22 @@ import java.util.function.Predicate
  * - Deserialising the output states.
  *
  * All the above refer to inputs using a (txhash, output index) pair.
+ *
+ * Usage notes:
+ *
+ * [LedgerTransaction] is an abstraction that is meant to be used during the transaction verification stage.
+ * It needs full access to input states that might be in transactions that are encrypted and unavailable for code running outside the secure enclave.
+ * Also, it might need to deserialize states with code that might not be available on the classpath.
+ *
+ * Because of this, trying to create or use a [LedgerTransaction] for any other purpose then transaction verification can result in unexpected exceptions,
+ * which need de be handled.
+ *
+ * [LedgerTransaction]s should never be instantiated directly from client code, but rather via WireTransaction.toLedgerTransaction
  */
 @KeepForDJVM
 @CordaSerializable
 class LedgerTransaction
 @ConstructorForDeserialization
-// LedgerTransaction is not meant to be created directly from client code, but rather via WireTransaction.toLedgerTransaction
 private constructor(
         // DOCSTART 1
         /** The resolved input states which will be consumed/invalidated by the execution of this transaction. */
@@ -67,7 +77,6 @@ private constructor(
     private var serializedReferences: List<SerializedStateAndRef>? = null
 
     init {
-        checkBaseInvariants()
         if (timeWindow != null) check(notary != null) { "Transactions with time-windows must be notarised" }
         checkNotaryWhitelisted()
     }
@@ -133,6 +142,9 @@ private constructor(
         // Switch thread local deserialization context to using a cached attachments classloader. This classloader enforces various rules
         // like no-overlap, package namespace ownership and (in future) deterministic Java.
         return AttachmentsClassLoaderBuilder.withAttachmentsClassloaderContext(this.attachments + extraAttachments, getParamsWithGoo(), id) { transactionClassLoader ->
+            // Create a copy of the outer LedgerTransaction which deserializes all fields inside the [transactionClassLoader].
+            // Only the copy will be used for verification, and the outer shell will be discarded.
+            // This artifice is required to preserve backwards compatibility.
             Verifier(createLtxForVerification(), transactionClassLoader)
         }
     }
@@ -163,12 +175,17 @@ private constructor(
         return FlowLogic.currentTopLevel?.serviceHub?.networkParameters
     }
 
+    /**
+     * Create the [LedgerTransaction] instance that will be used by contract verification.
+     *
+     * This method needs to run in the special transaction attachments classloader context.
+     */
     private fun createLtxForVerification(): LedgerTransaction {
         val serializedInputs = this.serializedInputs
         val serializedReferences = this.serializedReferences
         val componentGroups = this.componentGroups
 
-        return if (serializedInputs != null && serializedReferences != null && componentGroups != null) {
+        val transaction= if (serializedInputs != null && serializedReferences != null && componentGroups != null) {
             // Deserialize all relevant classes in the transaction classloader.
             val deserializedInputs = serializedInputs.map { it.toStateAndRef() }
             val deserializedReferences = serializedReferences.map { it.toStateAndRef() }
@@ -198,6 +215,12 @@ private constructor(
                     "The result of the verify method might not be accurate.")
             this
         }
+
+        // This check accesses input states and must be run in this context.
+        // It must run on the instance that is verified, not on the outer LedgerTransaction shell.
+        transaction.checkBaseInvariants()
+
+        return transaction
     }
 
     /**

node/src/main/kotlin/net/corda/node/services/vault/NodeVaultService.kt

@@ -224,14 +224,35 @@ class NodeVaultService(
     }
 
     private fun makeUpdates(batch: Iterable<CoreTransaction>, statesToRecord: StatesToRecord): List<Vault.Update<ContractState>> {
+
+        fun <T> withValidDeserialization(list: List<T>, txId: SecureHash): Map<Int, T> = (0 until list.size).mapNotNull { idx ->
+            try {
+                idx to list[idx]
+            } catch (e: TransactionDeserialisationException) {
+                // When resolving transaction dependencies we might encounter contracts we haven't installed locally.
+                // This will cause a failure as we can't deserialize such states in the context of the `appClassloader`.
+                // For now we ignore these states.
+                // In the future we will use the AttachmentsClassloader to correctly deserialize and asses the relevancy.
+                log.debug { "Could not deserialize state $idx from transaction $txId. Cause: $e" }
+                null
+            }
+        }.toMap()
+
+        // Returns only output states that can be deserialised successfully.
+        fun WireTransaction.deserializableOutputStates(): Map<Int, TransactionState<ContractState>> = withValidDeserialization(this.outputs, this.id)
+
+        // Returns only reference states that can be deserialised successfully.
+        fun LedgerTransaction.deserializableRefStates(): Map<Int, StateAndRef<ContractState>> = withValidDeserialization(this.references, this.id)
+
         fun makeUpdate(tx: WireTransaction): Vault.Update<ContractState>? {
+            val outputs: Map<Int, TransactionState<ContractState>> = tx.deserializableOutputStates()
             val ourNewStates = when (statesToRecord) {
                 StatesToRecord.NONE -> throw AssertionError("Should not reach here")
-                StatesToRecord.ONLY_RELEVANT -> tx.outputs.withIndex().filter {
-                    isRelevant(it.value.data, keyManagementService.filterMyKeys(tx.outputs.flatMap { it.data.participants.map { it.owningKey } }).toSet())
+                StatesToRecord.ONLY_RELEVANT -> outputs.filter { (_, value) ->
+                    isRelevant(value.data, keyManagementService.filterMyKeys(outputs.values.flatMap { it.data.participants.map { it.owningKey } }).toSet())
                 }
-                StatesToRecord.ALL_VISIBLE -> tx.outputs.withIndex()
-            }.map { tx.outRef<ContractState>(it.index) }
+                StatesToRecord.ALL_VISIBLE -> outputs
+            }.map { (idx, _) -> tx.outRef<ContractState>(idx) }
 
             // Retrieve all unconsumed states for this transaction's inputs.
             val consumedStates = loadStates(tx.inputs)
@@ -250,12 +271,14 @@ class NodeVaultService(
             val newReferenceStateAndRefs = if (tx.references.isEmpty()) {
                 emptyList()
             } else {
-                 when (statesToRecord) {
+                when (statesToRecord) {
                     StatesToRecord.NONE -> throw AssertionError("Should not reach here")
                     StatesToRecord.ALL_VISIBLE, StatesToRecord.ONLY_RELEVANT -> {
                         val notSeenReferences = tx.references - loadStates(tx.references).map { it.ref }
                         // TODO: This is expensive - is there another way?
-                        tx.toLedgerTransaction(servicesForResolution).references.filter { it.ref in notSeenReferences }
+                        tx.toLedgerTransaction(servicesForResolution).deserializableRefStates()
+                                .filter { (_, stateAndRef) -> stateAndRef.ref in notSeenReferences }
+                                .values
                     }
                 }
             }