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Example code for contract upgrade using RPC. (#237)
* Added missing out modifier to UpgradedContract class * Added ContractUpgradeFlow.Instigator to whitelist in AbstractNode * Added test for contract upgrade using RPC
This commit is contained in:
Patrick Kuo
GitHub
parent
36052cbd63
commit
28e83d1e66
@ -12,7 +12,7 @@ val DUMMY_V2_PROGRAM_ID = DummyContractV2()
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* Dummy contract state for testing of the upgrade process.
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*/
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class DummyContractV2 : UpgradedContract<DummyContract.State, DummyContractV2.State> {
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override val legacyContract = DUMMY_PROGRAM_ID
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override val legacyContract = DummyContract::class.java
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data class State(val magicNumber: Int = 0, val owners: List<CompositeKey>) : ContractState {
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override val contract = DUMMY_V2_PROGRAM_ID
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@ -398,7 +398,7 @@ interface NetCommand : CommandData {
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}
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/** Indicates that this transaction replaces the inputs contract state to another contract state */
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data class UpgradeCommand(val upgradedContractClass: Class<UpgradedContract<*, *>>) : CommandData
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data class UpgradeCommand(val upgradedContractClass: Class<out UpgradedContract<*, *>>) : CommandData
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/** Wraps an object that was signed by a public key, which may be a well known/recognised institutional key. */
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data class AuthenticatedObject<out T : Any>(
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@ -456,7 +456,7 @@ interface Contract {
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* @param NewState the upgraded contract state.
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*/
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interface UpgradedContract<in OldState : ContractState, out NewState : ContractState> : Contract {
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val legacyContract: Contract
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val legacyContract: Class<out Contract>
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/**
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* Upgrade contract's state object to a new state object.
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*
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@ -114,7 +114,7 @@ interface CordaRPCOps : RPCOps {
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* Invoking this method indicate the node is willing to upgrade the [state] using the [upgradedContractClass].
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* This method will NOT initiate the upgrade process. To start the upgrade process, see [ContractUpgradeFlow.Instigator].
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*/
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fun authoriseContractUpgrade(state: StateAndRef<*>, upgradedContractClass: Class<UpgradedContract<*, *>>)
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fun authoriseContractUpgrade(state: StateAndRef<*>, upgradedContractClass: Class<out UpgradedContract<*, *>>)
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/**
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* Authorise a contract state upgrade.
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@ -165,7 +165,7 @@ interface VaultService {
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/** Get contracts we would be willing to upgrade the suggested contract to. */
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// TODO: We need a better place to put business logic functions
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fun getAuthorisedContractUpgrade(ref: StateRef): Class<UpgradedContract<*, *>>?
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fun getAuthorisedContractUpgrade(ref: StateRef): Class<out UpgradedContract<*, *>>?
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/**
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* Authorise a contract state upgrade.
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@ -173,7 +173,7 @@ interface VaultService {
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* Invoking this method indicate the node is willing to upgrade the [state] using the [upgradedContractClass].
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* This method will NOT initiate the upgrade process. To start the upgrade process, see [ContractUpgradeFlow.Instigator].
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*/
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fun authoriseContractUpgrade(stateAndRef: StateAndRef<*>, upgradedContractClass: Class<UpgradedContract<*, *>>)
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fun authoriseContractUpgrade(stateAndRef: StateAndRef<*>, upgradedContractClass: Class<out UpgradedContract<*, *>>)
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/**
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* Authorise a contract state upgrade.
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@ -33,7 +33,7 @@ object ContractUpgradeFlow {
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val upgradedContract = command.upgradedContractClass.newInstance() as UpgradedContract<ContractState, *>
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requireThat {
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"The signing keys include all participant keys" by keysThatSigned.containsAll(participants)
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"Inputs state reference the legacy contract" by (input.contract.javaClass == upgradedContract.legacyContract.javaClass)
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"Inputs state reference the legacy contract" by (input.contract.javaClass == upgradedContract.legacyContract)
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"Outputs state reference the upgraded contract" by (output.contract.javaClass == command.upgradedContractClass)
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"Output state must be an upgraded version of the input state" by (output == upgradedContract.upgrade(input))
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}
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@ -41,17 +41,17 @@ object ContractUpgradeFlow {
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private fun <OldState : ContractState, NewState : ContractState> assembleBareTx(
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stateRef: StateAndRef<OldState>,
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upgradedContractClass: Class<UpgradedContract<OldState, NewState>>
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upgradedContractClass: Class<out UpgradedContract<OldState, NewState>>
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): TransactionBuilder {
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val contractUpgrade = upgradedContractClass.newInstance()
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return TransactionType.General.Builder(stateRef.state.notary)
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.withItems(stateRef, contractUpgrade.upgrade(stateRef.state.data), Command(UpgradeCommand(contractUpgrade.javaClass), stateRef.state.data.participants))
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.withItems(stateRef, contractUpgrade.upgrade(stateRef.state.data), Command(UpgradeCommand(upgradedContractClass), stateRef.state.data.participants))
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}
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class Instigator<OldState : ContractState, NewState : ContractState>(
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class Instigator<OldState : ContractState, out NewState : ContractState>(
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originalState: StateAndRef<OldState>,
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newContractClass: Class<UpgradedContract<OldState, NewState>>
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) : AbstractStateReplacementFlow.Instigator<OldState, NewState, Class<UpgradedContract<OldState, NewState>>>(originalState, newContractClass) {
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newContractClass: Class<out UpgradedContract<OldState, NewState>>
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) : AbstractStateReplacementFlow.Instigator<OldState, NewState, Class<out UpgradedContract<OldState, NewState>>>(originalState, newContractClass) {
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override fun assembleTx(): Pair<SignedTransaction, Iterable<CompositeKey>> {
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val stx = assembleBareTx(originalState, modification)
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@ -61,10 +61,10 @@ object ContractUpgradeFlow {
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}
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}
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class Acceptor(otherSide: Party) : AbstractStateReplacementFlow.Acceptor<Class<UpgradedContract<ContractState, *>>>(otherSide) {
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class Acceptor(otherSide: Party) : AbstractStateReplacementFlow.Acceptor<Class<out UpgradedContract<ContractState, *>>>(otherSide) {
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@Suspendable
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@Throws(StateReplacementException::class)
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override fun verifyProposal(proposal: Proposal<Class<UpgradedContract<ContractState, *>>>) {
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override fun verifyProposal(proposal: Proposal<Class<out UpgradedContract<ContractState, *>>>) {
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// Retrieve signed transaction from our side, we will apply the upgrade logic to the transaction on our side, and verify outputs matches the proposed upgrade.
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val stx = subFlow(FetchTransactionsFlow(setOf(proposal.stateRef.txhash), otherSide)).fromDisk.singleOrNull()
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requireNotNull(stx) { "We don't have a copy of the referenced state" }
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@ -6,11 +6,16 @@ import net.corda.core.crypto.CompositeKey
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import net.corda.core.crypto.Party
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import net.corda.core.crypto.SecureHash
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import net.corda.core.getOrThrow
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import net.corda.core.messaging.startFlow
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import net.corda.core.serialization.OpaqueBytes
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import net.corda.core.utilities.Emoji
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import net.corda.flows.CashIssueFlow
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import net.corda.flows.ContractUpgradeFlow
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import net.corda.flows.FinalityFlow
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import net.corda.node.internal.CordaRPCOpsImpl
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import net.corda.node.services.User
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import net.corda.node.services.messaging.CURRENT_RPC_USER
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import net.corda.node.services.startFlowPermission
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import net.corda.node.utilities.databaseTransaction
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import net.corda.testing.node.MockNetwork
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import org.junit.After
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@ -60,15 +65,15 @@ class ContractUpgradeFlowTest {
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requireNotNull(btx)
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// The request is expected to be rejected because party B haven't authorise the upgrade yet.
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val rejectedFuture = a.services.startFlow(ContractUpgradeFlow.Instigator<DummyContract.State, DummyContractV2.State>(atx!!.tx.outRef(0), DUMMY_V2_PROGRAM_ID.javaClass)).resultFuture
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val rejectedFuture = a.services.startFlow(ContractUpgradeFlow.Instigator(atx!!.tx.outRef(0), DummyContractV2::class.java)).resultFuture
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mockNet.runNetwork()
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assertFailsWith(ExecutionException::class) { rejectedFuture.get() }
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// Party B authorise the contract state upgrade.
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b.services.vaultService.authoriseContractUpgrade(btx!!.tx.outRef<ContractState>(0), DUMMY_V2_PROGRAM_ID.javaClass)
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b.services.vaultService.authoriseContractUpgrade(btx!!.tx.outRef<ContractState>(0), DummyContractV2::class.java)
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// Party A initiates contract upgrade flow, expected to succeed this time.
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val resultFuture = a.services.startFlow(ContractUpgradeFlow.Instigator<DummyContract.State, DummyContractV2.State>(atx.tx.outRef(0), DUMMY_V2_PROGRAM_ID.javaClass)).resultFuture
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val resultFuture = a.services.startFlow(ContractUpgradeFlow.Instigator(atx.tx.outRef(0), DummyContractV2::class.java)).resultFuture
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mockNet.runNetwork()
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val result = resultFuture.get()
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@ -87,6 +92,63 @@ class ContractUpgradeFlowTest {
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}
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}
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@Test
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fun `2 parties contract upgrade using RPC`() {
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// Create dummy contract.
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val twoPartyDummyContract = DummyContract.generateInitial(0, notary, a.info.legalIdentity.ref(1), b.info.legalIdentity.ref(1))
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val stx = twoPartyDummyContract.signWith(a.services.legalIdentityKey)
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.signWith(b.services.legalIdentityKey)
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.toSignedTransaction()
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a.services.startFlow(FinalityFlow(stx, setOf(a.info.legalIdentity, b.info.legalIdentity)))
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mockNet.runNetwork()
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val atx = databaseTransaction(a.database) { a.services.storageService.validatedTransactions.getTransaction(stx.id) }
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val btx = databaseTransaction(b.database) { b.services.storageService.validatedTransactions.getTransaction(stx.id) }
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requireNotNull(atx)
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requireNotNull(btx)
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// The request is expected to be rejected because party B haven't authorise the upgrade yet.
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val rpcA = CordaRPCOpsImpl(a.services, a.smm, a.database)
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val rpcB = CordaRPCOpsImpl(b.services, b.smm, b.database)
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CURRENT_RPC_USER.set(User("user", "pwd", permissions = setOf(
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startFlowPermission<ContractUpgradeFlow.Instigator<*, *>>()
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)))
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val rejectedFuture = rpcA.startFlow({ stateAndRef, upgrade -> ContractUpgradeFlow.Instigator(stateAndRef, upgrade) },
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atx!!.tx.outRef<DummyContract.State>(0),
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DummyContractV2::class.java).returnValue
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mockNet.runNetwork()
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assertFailsWith(ExecutionException::class) { rejectedFuture.get() }
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// Party B authorise the contract state upgrade.
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rpcB.authoriseContractUpgrade(btx!!.tx.outRef<ContractState>(0), DummyContractV2::class.java)
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// Party A initiates contract upgrade flow, expected to succeed this time.
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val resultFuture = rpcA.startFlow({ stateAndRef, upgrade -> ContractUpgradeFlow.Instigator(stateAndRef, upgrade) },
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atx.tx.outRef<DummyContract.State>(0),
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DummyContractV2::class.java).returnValue
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mockNet.runNetwork()
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val result = resultFuture.get()
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// Check results.
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listOf(a, b).forEach {
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val stx = databaseTransaction(a.database) { a.services.storageService.validatedTransactions.getTransaction(result.ref.txhash) }
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requireNotNull(stx)
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// Verify inputs.
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val input = databaseTransaction(a.database) { a.services.storageService.validatedTransactions.getTransaction(stx!!.tx.inputs.single().txhash) }
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requireNotNull(input)
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assertTrue(input!!.tx.outputs.single().data is DummyContract.State)
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// Verify outputs.
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assertTrue(stx!!.tx.outputs.single().data is DummyContractV2.State)
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}
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}
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@Test
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fun `upgrade Cash to v2`() {
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// Create some cash.
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@ -94,7 +156,7 @@ class ContractUpgradeFlowTest {
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mockNet.runNetwork()
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val stateAndRef = result.getOrThrow().tx.outRef<Cash.State>(0)
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// Starts contract upgrade flow.
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a.services.startFlow(ContractUpgradeFlow.Instigator<Cash.State, CashV2.State>(stateAndRef, CashV2().javaClass))
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a.services.startFlow(ContractUpgradeFlow.Instigator(stateAndRef, CashV2::class.java))
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mockNet.runNetwork()
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// Get contract state form the vault.
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val state = databaseTransaction(a.database) { a.vault.currentVault.states }
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@ -104,7 +166,7 @@ class ContractUpgradeFlowTest {
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}
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class CashV2 : UpgradedContract<Cash.State, CashV2.State> {
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override val legacyContract = Cash()
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override val legacyContract = Cash::class.java
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data class State(override val amount: Amount<Issued<Currency>>, val owners: List<CompositeKey>) : FungibleAsset<Currency> {
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override val owner: CompositeKey = owners.first()
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@ -1,3 +1,9 @@
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.. highlight:: kotlin
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.. raw:: html
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<script type="text/javascript" src="_static/jquery.js"></script>
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<script type="text/javascript" src="_static/codesets.js"></script>
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Upgrading Contracts
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===================
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@ -48,19 +54,18 @@ Currently the vault service is used to manage the authorisation records. The adm
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.. sourcecode:: kotlin
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/**
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* Authorise a contract state upgrade.
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* This will store the upgrade authorisation in the vault, and will be queried by [ContractUpgradeFlow.Acceptor] during contract upgrade process.
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* Invoking this method indicate the node is willing to upgrade the [state] using the [upgradedContractClass].
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* This method will NOT initiate the upgrade process. To start the upgrade process, see [ContractUpgradeFlow.Instigator].
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*/
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fun authoriseContractUpgrade(state: StateAndRef<*>, upgradedContractClass: Class<UpgradedContract<*, *>>)
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/**
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* Authorise a contract state upgrade.
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* This will remove the upgrade authorisation from the vault.
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*/
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fun deauthoriseContractUpgrade(state: StateAndRef<*>)
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/**
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* Authorise a contract state upgrade.
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* This will store the upgrade authorisation in the vault, and will be queried by [ContractUpgradeFlow.Acceptor] during contract upgrade process.
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* Invoking this method indicate the node is willing to upgrade the [state] using the [upgradedContractClass].
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* This method will NOT initiate the upgrade process. To start the upgrade process, see [ContractUpgradeFlow.Instigator].
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*/
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fun authoriseContractUpgrade(state: StateAndRef<*>, upgradedContractClass: Class<UpgradedContract<*, *>>)
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/**
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* Authorise a contract state upgrade.
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* This will remove the upgrade authorisation from the vault.
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*/
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fun deauthoriseContractUpgrade(state: StateAndRef<*>)
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@ -70,3 +75,72 @@ Proposing an upgrade
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After all parties have registered the intention of upgrading the contract state, one of the contract participant can initiate the upgrade process by running the contract upgrade flow.
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The Instigator will create a new state and sent to each participant for signatures, each of the participants (Acceptor) will verify and sign the proposal and returns to the instigator.
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The transaction will be notarised and persisted once every participant verified and signed the upgrade proposal.
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Examples
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--------
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Lets assume Bank A has entered into an agreement with Bank B, and the contract is translated into contract code ``DummyContract`` with state object ``DummyContractState``.
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Few days after the exchange of contracts, the developer of the contract code discovered a bug/misrepresentation in the contract code.
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Bank A and Bank B decided to upgrade the contract to ``DummyContractV2``
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1. Developer will create a new contract extending the ``UpgradedContract`` class, and a new state object ``DummyContractV2.State`` referencing the new contract.
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.. container:: codeset
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.. sourcecode:: kotlin
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class DummyContractV2 : UpgradedContract<DummyContract.State, DummyContractV2.State> {
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override val legacyContract = DummyContract::class.java
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data class State(val magicNumber: Int = 0, val owners: List<CompositeKey>) : ContractState {
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override val contract = DUMMY_V2_PROGRAM_ID
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override val participants: List<CompositeKey> = owners
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}
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interface Commands : CommandData {
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class Create : TypeOnlyCommandData(), Commands
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class Move : TypeOnlyCommandData(), Commands
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}
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override fun upgrade(state: DummyContract.State): DummyContractV2.State {
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return DummyContractV2.State(state.magicNumber, state.participants)
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}
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override fun verify(tx: TransactionForContract) {
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if (tx.commands.any { it.value is UpgradeCommand }) ContractUpgradeFlow.verify(tx)
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// Other verifications.
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}
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// The "empty contract"
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override val legalContractReference: SecureHash = SecureHash.sha256("")
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}
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2. Bank A will instruct its node to accept the contract upgrade to ``DummyContractV2`` for the contract state.
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.. container:: codeset
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.. sourcecode:: kotlin
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val rpcClient : CordaRPCClient = << Bank A's Corda RPC Client >>
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val rpcA = rpcClient.proxy()
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rpcA.authoriseContractUpgrade(<<StateAndRef of the contract state>>, DummyContractV2::class.java)
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3. Bank B now initiate the upgrade Flow, this will send a upgrade proposal to all contract participants.
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Each of the participants of the contract state will sign and return the contract state upgrade proposal once they have validated and agreed with the upgrade.
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The upgraded transaction state will be recorded in every participant's node at the end of the flow.
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.. container:: codeset
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.. sourcecode:: kotlin
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val rpcClient : CordaRPCClient = << Bank B's Corda RPC Client >>
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val rpcB = rpcClient.proxy()
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rpcB.startFlow({ stateAndRef, upgrade -> ContractUpgradeFlow.Instigator(stateAndRef, upgrade) },
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<<StateAndRef of the contract state>>,
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DummyContractV2::class.java)
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.. note:: See ``ContractUpgradeFlowTest.2 parties contract upgrade using RPC`` for more detailed code example.
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@ -87,6 +87,7 @@ Documentation Contents:
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tutorial-contract
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tutorial-contract-clauses
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tutorial-test-dsl
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contract-upgrade
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tutorial-integration-testing
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tutorial-clientrpc-api
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tutorial-building-transactions
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@ -105,7 +106,6 @@ Documentation Contents:
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network-simulator
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clauses
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merkle-trees
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contract-upgrade
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.. toctree::
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:maxdepth: 2
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@ -84,7 +84,8 @@ abstract class AbstractNode(open val configuration: NodeConfiguration,
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CashExitFlow::class.java to setOf(Amount::class.java, PartyAndReference::class.java),
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CashIssueFlow::class.java to setOf(Amount::class.java, OpaqueBytes::class.java, Party::class.java),
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CashPaymentFlow::class.java to setOf(Amount::class.java, Party::class.java),
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FinalityFlow::class.java to emptySet()
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FinalityFlow::class.java to emptySet(),
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ContractUpgradeFlow.Instigator::class.java to emptySet()
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)
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}
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@ -103,7 +103,7 @@ class CordaRPCOpsImpl(
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override fun attachmentExists(id: SecureHash) = services.storageService.attachments.openAttachment(id) != null
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override fun uploadAttachment(jar: InputStream) = services.storageService.attachments.importAttachment(jar)
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override fun authoriseContractUpgrade(state: StateAndRef<*>, upgradedContractClass: Class<UpgradedContract<*, *>>) = services.vaultService.authoriseContractUpgrade(state, upgradedContractClass)
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override fun authoriseContractUpgrade(state: StateAndRef<*>, upgradedContractClass: Class<out UpgradedContract<*, *>>) = services.vaultService.authoriseContractUpgrade(state, upgradedContractClass)
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override fun deauthoriseContractUpgrade(state: StateAndRef<*>) = services.vaultService.deauthoriseContractUpgrade(state)
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override fun currentNodeTime(): Instant = Instant.now(services.clock)
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@Suppress("OverridingDeprecatedMember", "DEPRECATION")
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@ -338,13 +338,13 @@ class NodeVaultService(private val services: ServiceHub) : SingletonSerializeAsT
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}
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// TODO : Persists this in DB.
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private val authorisedUpgrade = mutableMapOf<StateRef, Class<UpgradedContract<*, *>>>()
|
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private val authorisedUpgrade = mutableMapOf<StateRef, Class<out UpgradedContract<*, *>>>()
|
||||
|
||||
override fun getAuthorisedContractUpgrade(ref: StateRef) = authorisedUpgrade[ref]
|
||||
|
||||
override fun authoriseContractUpgrade(stateAndRef: StateAndRef<*>, upgradedContractClass: Class<UpgradedContract<*, *>>) {
|
||||
override fun authoriseContractUpgrade(stateAndRef: StateAndRef<*>, upgradedContractClass: Class<out UpgradedContract<*, *>>) {
|
||||
val upgrade = upgradedContractClass.newInstance()
|
||||
if (upgrade.legacyContract.javaClass != stateAndRef.state.data.contract.javaClass) {
|
||||
if (upgrade.legacyContract != stateAndRef.state.data.contract.javaClass) {
|
||||
throw IllegalArgumentException("The contract state cannot be upgraded using provided UpgradedContract.")
|
||||
}
|
||||
authorisedUpgrade.put(stateAndRef.ref, upgradedContractClass)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user