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Make NotaryFlow.Client more modular and easier to customise

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This commit is contained in:
Andrius Dagys 2018-02-01 17:19:14 +00:00
parent b91dd43a83
commit a702d792a7
1 changed files with 36 additions and 9 deletions
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45
core/src/main/kotlin/net/corda/core/flows/NotaryFlow.kt
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@ -47,8 +47,18 @@ class NotaryFlow {
@Suspendable
@Throws(NotaryException::class)
override fun call(): List<TransactionSignature> {
val notaryParty = checkTransaction()
progressTracker.currentStep = REQUESTING
val response = notarise(notaryParty)
progressTracker.currentStep = VALIDATING
return validateResponse(response, notaryParty)
}
/**
* Checks that the transaction specifies a valid notary, and verifies that it contains all required signatures
* apart from the notary's.
*/
protected fun checkTransaction(): Party {
val notaryParty = stx.notary ?: throw IllegalStateException("Transaction does not specify a Notary")
check(serviceHub.networkMapCache.isNotary(notaryParty)) { "$notaryParty is not a notary on the network" }
check(stx.inputs.all { stateRef -> serviceHub.loadState(stateRef).notary == notaryParty }) {
@ -60,19 +70,18 @@ class NotaryFlow {
} catch (ex: SignatureException) {
throw NotaryException(NotaryError.TransactionInvalid(ex))
}
return notaryParty
}
val response = try {
@Throws(NotaryException::class)
@Suspendable
protected fun notarise(notaryParty: Party): UntrustworthyData<List<TransactionSignature>> {
return try {
val session = initiateFlow(notaryParty)
if (serviceHub.networkMapCache.isValidatingNotary(notaryParty)) {
subFlow(SendTransactionWithRetry(session, stx))
session.receive<List<TransactionSignature>>()
sendAndReceiveValidating(session)
} else {
val tx: Any = if (stx.isNotaryChangeTransaction()) {
stx.notaryChangeTx
} else {
stx.buildFilteredTransaction(Predicate { it is StateRef || it is TimeWindow || it == notaryParty })
}
session.sendAndReceiveWithRetry(tx)
sendAndReceiveNonValidating(notaryParty, session)
}
} catch (e: NotaryException) {
if (e.error is NotaryError.Conflict) {
@ -80,7 +89,25 @@ class NotaryFlow {
}
throw e
}
}
@Suspendable
protected open fun sendAndReceiveValidating(session: FlowSession): UntrustworthyData<List<TransactionSignature>> {
subFlow(SendTransactionWithRetry(session, stx))
return session.receive()
}
@Suspendable
protected open fun sendAndReceiveNonValidating(notaryParty: Party, session: FlowSession): UntrustworthyData<List<TransactionSignature>> {
val tx: Any = if (stx.isNotaryChangeTransaction()) {
stx.notaryChangeTx // Notary change transactions do not support filtering
} else {
stx.buildFilteredTransaction(Predicate { it is StateRef || it is TimeWindow || it == notaryParty })
}
return session.sendAndReceiveWithRetry(tx)
}
protected fun validateResponse(response: UntrustworthyData<List<TransactionSignature>>, notaryParty: Party): List<TransactionSignature> {
return response.unwrap { signatures ->
signatures.forEach { validateSignature(it, stx.id, notaryParty) }
signatures