From a11c41644d6f457e1a0b4fb24c2caaa5c9ffb3ee Mon Sep 17 00:00:00 2001 From: Ashutosh Meher Date: Wed, 30 Aug 2023 16:19:59 +0530 Subject: [PATCH 1/2] Token Kotlin Sample --- kotlin-samples/shinny-tokens/README.md | 134 ++++++++++ kotlin-samples/shinny-tokens/build.gradle | 84 ++++++ .../config/gradle-plugin-default-key.pem | 13 + .../shinny-tokens/config/log4j2.xml | 51 ++++ .../shinny-tokens/config/r3-ca-key.pem | 32 +++ .../config/static-network-config.json | 19 ++ .../shinny-tokens/contracts/build.gradle | 82 ++++++ .../samples/tokens/contracts/GoldContract.kt | 18 ++ .../samples/tokens/states/GoldState.kt | 43 +++ .../shinny-tokens/gradle.properties | 37 +++ .../gradle/wrapper/gradle-wrapper.jar | Bin 0 -> 61574 bytes .../gradle/wrapper/gradle-wrapper.properties | 6 + kotlin-samples/shinny-tokens/gradlew | 244 ++++++++++++++++++ kotlin-samples/shinny-tokens/gradlew.bat | 92 +++++++ kotlin-samples/shinny-tokens/settings.gradle | 26 ++ .../shinny-tokens/workflows/build.gradle | 84 ++++++ .../tokens/workflows/BurnGoldTokenFlow.kt | 181 +++++++++++++ .../FinalizeGoldTokenResponderFlow.kt | 43 +++ .../workflows/FinalizeGoldTokenSubFlow.kt | 57 ++++ .../tokens/workflows/IssueGoldTokenFlow.kt | 124 +++++++++ .../tokens/workflows/ListGoldTokens.kt | 64 +++++ .../tokens/workflows/TransferGoldTokenFlow.kt | 195 ++++++++++++++ 22 files changed, 1629 insertions(+) create mode 100644 kotlin-samples/shinny-tokens/README.md create mode 100644 kotlin-samples/shinny-tokens/build.gradle create mode 100644 kotlin-samples/shinny-tokens/config/gradle-plugin-default-key.pem create mode 100644 kotlin-samples/shinny-tokens/config/log4j2.xml create mode 100644 kotlin-samples/shinny-tokens/config/r3-ca-key.pem create mode 100644 kotlin-samples/shinny-tokens/config/static-network-config.json create mode 100644 kotlin-samples/shinny-tokens/contracts/build.gradle create mode 100644 kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/contracts/GoldContract.kt create mode 100644 kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/states/GoldState.kt create mode 100644 kotlin-samples/shinny-tokens/gradle.properties create mode 100644 kotlin-samples/shinny-tokens/gradle/wrapper/gradle-wrapper.jar create mode 100644 kotlin-samples/shinny-tokens/gradle/wrapper/gradle-wrapper.properties create mode 100755 kotlin-samples/shinny-tokens/gradlew create mode 100644 kotlin-samples/shinny-tokens/gradlew.bat create mode 100644 kotlin-samples/shinny-tokens/settings.gradle create mode 100644 kotlin-samples/shinny-tokens/workflows/build.gradle create mode 100644 kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.kt create mode 100644 kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenResponderFlow.kt create mode 100644 kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenSubFlow.kt create mode 100644 kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/IssueGoldTokenFlow.kt create mode 100644 kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/ListGoldTokens.kt create mode 100644 kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/TransferGoldTokenFlow.kt diff --git a/kotlin-samples/shinny-tokens/README.md b/kotlin-samples/shinny-tokens/README.md new file mode 100644 index 0000000..a086b2c --- /dev/null +++ b/kotlin-samples/shinny-tokens/README.md @@ -0,0 +1,134 @@ +# Tokens in Next-Gen Corda + +Unlike Corda 4, we don’t have an SDK for tokens in Next-Gen Corda; +the token’s functionality is brought into the core C5 platform. +We have also introduced a new Token Selection API, which enables a flow to claim +tokens exclusively and provides a way to merge and return fungible tokens satisfying a given amount. + +In this sample, I will show you how you can create a gold stablecoin, +a commodity backed enterprise-grade and regulatory-friendly stablecoin +using Next-Gen Corda. + +## Tokens app +In this application, we will mint gold tokens and then transfer these tokens. + +In this app you can: +1. Write a flow to Create a Gold Asset/State on Ledger. `IssueGoldTokensFlow` +2. List out the gold entries you had. `ListGoldTokens` +3. Claim and transfer the tokens to a new member. `TransferGoldTokenFlow` +4. Burn tokens available with a member. `BurnGoldTokenFlow` + +### Setting up + +1. We will begin our test deployment with clicking the `startCorda`. This task will load up the combined Corda workers in docker. + A successful deployment will allow you to open the REST APIs at: https://localhost:8888/api/v1/swagger#. You can test out some of the + functions to check connectivity. (GET /cpi function call should return an empty list as for now.) +2. We will now deploy the cordapp with a click of `5-vNodeSetup` task. Upon successful deployment of the CPI, the GET /cpi function call should now return the meta data of the cpi you just upload + +### Running the tokens app + +In Corda 5, flows will be triggered via `POST /flow/{holdingidentityshorthash}` and flow result will need to be view at `GET /flow/{holdingidentityshorthash}/{clientrequestid}` +* holdingidentityshorthash: the id of the network participants, ie Bob, Alice, Charlie. You can view all the short hashes of the network member with another gradle task called `ListVNodes` +* clientrequestid: the id you specify in the flow requestBody when you trigger a flow. + +#### Step 1: Create Gold State +Pick a VNode identity, and get its short hash. (Let's pick Alice.). + +Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Alice's hash) and request body: +``` +{ + "clientRequestId": "issue-1", + "flowClassName": "com.r3.developers.samples.tokens.workflows.IssueGoldTokensFlow", + "requestBody": { + "symbol": "GOLD", + "owner": "CN=Bob, OU=Test Dept, O=R3, L=London, C=GB", + "amount": "20" + } +} +``` + +After trigger the IssueGoldTokensFlow flow, hop to `GET /flow/{holdingidentityshorthash}/{clientrequestid}` and enter the short hash(Alice's hash) and clientrequestid to view the flow result + +#### Step 2: List the gold state +Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Bob's hash) and request body: +``` +{ + "clientRequestId": "list-1", + "flowClassName": "com.r3.developers.samples.tokens.workflows.ListGoldTokens", + "requestBody": {} +} +``` +After trigger the ListGoldTokens flow, again, we need to hop to `GET /flow/{holdingidentityshorthash}/{clientrequestid}` +and check the result. + +#### Step 3: Transfer the gold token with `TransferGoldTokenFlow` +In this step, Bob will transfer some tokens from his vault to Charlie. +Goto `POST /flow/{holdingidentityshorthash}`, enter the identity short hash and request body. +Use Bob's holdingidentityshorthash to fire this post API. +``` +{ + "clientRequestId": "transfer-1", + "flowClassName": "com.r3.developers.samples.tokens.workflows.TransferGoldTokenFlow", + "requestBody": { + "symbol": "GOLD", + "issuer": "CN=Alice, OU=Test Dept, O=R3, L=London, C=GB", + "receiver": "CN=Charlie, OU=Test Dept, O=R3, L=London, C=GB", + "amount": "5" + } +} +``` +And as for the result of this flow, go to `GET /flow/{holdingidentityshorthash}/{clientrequestid}` and enter the required fields. + +#### Step 4: Confirm the token balances of Bob and Charlie +Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Bob's hash) and request body: +``` +{ + "clientRequestId": "list-2", + "flowClassName": "com.r3.developers.samples.tokens.workflows.ListGoldTokens", + "requestBody": {} +} +``` +Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Charlie's hash) and request body: +``` +{ + "clientRequestId": "list-3", + "flowClassName": "com.r3.developers.samples.tokens.workflows.ListGoldTokens", + "requestBody": {} +} +``` + +And as for the result, you need to go to the Get API again and enter the short hash and client request ID. + +#### Step 5: Burn gold token with BurnGoldTokenFlow +Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Bob's hash) and request body: +``` +{ + "clientRequestId": "burn-1", + "flowClassName": "com.r3.developers.samples.tokens.workflows.BurnGoldTokenFlow", + "requestBody": { + "symbol": "GOLD", + "issuer": "CN=Alice, OU=Test Dept, O=R3, L=London, C=GB", + "amount": "5" + } +} +``` +Go to `GET /flow/{holdingidentityshorthash}/{clientrequestid}` and enter the required fields to check the result of +the flow. + +#### Step 4: Confirm the token balance of Bob + +Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Bob's hash) and request body: +``` +{ + "clientRequestId": "list-4", + "flowClassName": "com.r3.developers.samples.tokens.workflows.ListGoldTokens", + "requestBody": {} +} +``` + +And as for the result, you need to go to the Get API again and enter the short hash and client request ID. +Thus, we have concluded a full run through of the token app. + +# Additional Information + +To read more about Token Selection API, you can visit the [docs](https://docs.r3.com/en/platform/corda/5.0/developing-applications/api/ledger/utxo-ledger/token-selection.html) \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/build.gradle b/kotlin-samples/shinny-tokens/build.gradle new file mode 100644 index 0000000..feb78e5 --- /dev/null +++ b/kotlin-samples/shinny-tokens/build.gradle @@ -0,0 +1,84 @@ +import static org.gradle.api.JavaVersion.VERSION_11 + +plugins { + id 'org.jetbrains.kotlin.jvm' + id 'net.corda.cordapp.cordapp-configuration' + id 'org.jetbrains.kotlin.plugin.jpa' + id 'java' + id 'maven-publish' + id 'net.corda.plugins.csde' +} + +allprojects { + group 'com.r3.developers.samples' + version '1.0-SNAPSHOT' + + def javaVersion = VERSION_11 + + // Configure the CSDE + csde { + cordaClusterURL = "https://localhost:8888" + networkConfigFile = "config/static-network-config.json" + r3RootCertFile = "config/r3-ca-key.pem" + corDappCpiName = "MyCorDapp" + notaryCpiName = "NotaryServer" + cordaRpcUser = "admin" + cordaRpcPasswd ="admin" + workflowsModuleName = workflowsModule + csdeWorkspaceDir = "workspace" + notaryVersion = cordaNotaryPluginsVersion + combinedWorkerVersion = combinedWorkerJarVersion + postgresJdbcVersion = "42.4.3" + cordaDbContainerName = "CSDEpostgresql" + cordaBinDir = "${System.getProperty("user.home")}/.corda/corda5" + cordaCliBinDir = "${System.getProperty("user.home")}/.corda/cli" + } + + // Declare the set of Kotlin compiler options we need to build a CorDapp. + tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach { + kotlinOptions { + allWarningsAsErrors = false + + // Specify the version of Kotlin that we are that we will be developing. + languageVersion = '1.7' + // Specify the Kotlin libraries that code is compatible with + apiVersion = '1.7' + // Note that we Need to use a version of Kotlin that will be compatible with the Corda API. + // Currently that is developed in Kotlin 1.7 so picking the same version ensures compatibility with that. + + // Specify the version of Java to target. + jvmTarget = javaVersion + + // Needed for reflection to work correctly. + javaParameters = true + + // -Xjvm-default determines how Kotlin supports default methods. + // JetBrains currently recommends developers use -Xjvm-default=all + // https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm/-jvm-default/ + freeCompilerArgs += [ + "-Xjvm-default=all" + ] + } + } + + repositories { + // All dependencies are held in Maven Central + mavenLocal() + mavenCentral() + } + + tasks.withType(Test).configureEach { + useJUnitPlatform() + } + +} + +publishing { + publications { + maven(MavenPublication) { + artifactId "corda5-token-cordapp" + groupId project.group + artifact jar + } + } +} diff --git a/kotlin-samples/shinny-tokens/config/gradle-plugin-default-key.pem b/kotlin-samples/shinny-tokens/config/gradle-plugin-default-key.pem new file mode 100644 index 0000000..5294bbd --- /dev/null +++ b/kotlin-samples/shinny-tokens/config/gradle-plugin-default-key.pem @@ -0,0 +1,13 @@ +-----BEGIN CERTIFICATE----- +MIIB7zCCAZOgAwIBAgIEFyV7dzAMBggqhkjOPQQDAgUAMFsxCzAJBgNVBAYTAkdC +MQ8wDQYDVQQHDAZMb25kb24xDjAMBgNVBAoMBUNvcmRhMQswCQYDVQQLDAJSMzEe +MBwGA1UEAwwVQ29yZGEgRGV2IENvZGUgU2lnbmVyMB4XDTIwMDYyNTE4NTI1NFoX +DTMwMDYyMzE4NTI1NFowWzELMAkGA1UEBhMCR0IxDzANBgNVBAcTBkxvbmRvbjEO +MAwGA1UEChMFQ29yZGExCzAJBgNVBAsTAlIzMR4wHAYDVQQDExVDb3JkYSBEZXYg 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b/kotlin-samples/shinny-tokens/contracts/build.gradle new file mode 100644 index 0000000..da26473 --- /dev/null +++ b/kotlin-samples/shinny-tokens/contracts/build.gradle @@ -0,0 +1,82 @@ + +plugins { + // Include the cordapp-cpb plugin. This automatically includes the cordapp-cpk plugin as well. + // These extend existing build environment so that CPB and CPK files can be built. + // This includes a CorDapp DSL that allows the developer to supply metadata for the CorDapp + // required by Corda. + id 'net.corda.plugins.cordapp-cpb2' + id 'org.jetbrains.kotlin.jvm' + id 'maven-publish' +} + +// Declare dependencies for the modules we will use. +// A cordaProvided declaration is required for anything that we use that the Corda API provides. +// This is required to allow us to build CorDapp modules as OSGi bundles that CPI and CPB files are built on. +dependencies { + + cordaProvided 'org.jetbrains.kotlin:kotlin-osgi-bundle' + + // Declare a "platform" so that we use the correct set of dependency versions for the version of the + // Corda API specified. + cordaProvided platform("net.corda:corda-api:$cordaApiVersion") + + // If using transistive dependencies this will provide most of Corda-API: + // cordaProvided 'net.corda:corda-application' + + // Alternatively we can explicitly specify all our Corda-API dependencies: + cordaProvided 'net.corda:corda-base' + cordaProvided 'net.corda:corda-application' + cordaProvided 'net.corda:corda-crypto' + cordaProvided 'net.corda:corda-membership' + // cordaProvided 'net.corda:corda-persistence' + cordaProvided 'net.corda:corda-serialization' + cordaProvided 'net.corda:corda-ledger-utxo' + cordaProvided 'net.corda:corda-ledger-consensual' + + // CorDapps that use the UTXO ledger must include at least one notary client plugin + cordapp "com.r3.corda.notary.plugin.nonvalidating:notary-plugin-non-validating-client:$cordaNotaryPluginsVersion" + + // The CorDapp uses the slf4j logging framework. Corda-API provides this so we need a 'cordaProvided' declaration. + cordaProvided 'org.slf4j:slf4j-api' + + // 3rd party libraries + // Required + testImplementation "org.slf4j:slf4j-simple:2.0.0" + testImplementation "org.junit.jupiter:junit-jupiter:$junitVersion" + testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion" + + // Optional but used by example tests. + testImplementation "org.mockito:mockito-core:$mockitoVersion" + testImplementation "org.mockito.kotlin:mockito-kotlin:$mockitoKotlinVersion" + testImplementation "org.hamcrest:hamcrest-library:$hamcrestVersion" +} + +// The CordApp section. +// This is part of the DSL provided by the corda plugins to define metadata for our CorDapp. +// Each component of the CorDapp would get its own CorDapp section in the build.gradle file for the component’s +// subproject. +// This is required by the corda plugins to build the CorDapp. +cordapp { + // "targetPlatformVersion" and "minimumPlatformVersion" are intended to specify the preferred + // and earliest versions of the Corda platform that the CorDapp will run on respectively. + // Enforced versioning has not implemented yet so we need to pass in a dummy value for now. + // The platform version will correspond to and be roughly equivalent to the Corda API version. + targetPlatformVersion = platformVersion.toInteger() + minimumPlatformVersion = platformVersion.toInteger() + + // The cordapp section contains either a workflow or contract subsection depending on the type of component. + // Declares the type and metadata of the CPK (this CPB has one CPK). + contract { + name "ContractsModuleNameHere" + versionId 1 + vendor "VendorNameHere" + } +} + +publishing { + publications { + maven(MavenPublication) { + from components.cordapp + } + } +} diff --git a/kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/contracts/GoldContract.kt b/kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/contracts/GoldContract.kt new file mode 100644 index 0000000..c94c8da --- /dev/null +++ b/kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/contracts/GoldContract.kt @@ -0,0 +1,18 @@ +package com.r3.developers.samples.tokens.contracts + +import net.corda.v5.ledger.utxo.Command +import net.corda.v5.ledger.utxo.Contract +import net.corda.v5.ledger.utxo.transaction.UtxoLedgerTransaction + + +class GoldContract: Contract { + + class Issue: Command + class Transfer: Command + class Burn: Command + + override fun verify(transaction: UtxoLedgerTransaction) { + // Add contract validation logic here. + } + +} \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/states/GoldState.kt b/kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/states/GoldState.kt new file mode 100644 index 0000000..be29bcf --- /dev/null +++ b/kotlin-samples/shinny-tokens/contracts/src/main/kotlin/com/r3/developers/samples/tokens/states/GoldState.kt @@ -0,0 +1,43 @@ +package com.r3.developers.samples.tokens.states + +import com.r3.developers.samples.tokens.contracts.GoldContract +import net.corda.v5.application.crypto.DigestService +import net.corda.v5.crypto.SecureHash +import net.corda.v5.ledger.utxo.BelongsToContract +import net.corda.v5.ledger.utxo.ContractState +import net.corda.v5.ledger.utxo.observer.UtxoLedgerTokenStateObserver +import net.corda.v5.ledger.utxo.observer.UtxoToken +import net.corda.v5.ledger.utxo.observer.UtxoTokenFilterFields +import net.corda.v5.ledger.utxo.observer.UtxoTokenPoolKey +import java.math.BigDecimal +import java.security.PublicKey + +@BelongsToContract(GoldContract::class) +data class GoldState( + val issuer: SecureHash, + val owner: SecureHash, + val symbol: String, + val amount: BigDecimal, + private val participants: List) : ContractState { + override fun getParticipants(): List { + return participants + } + +} + +/* +By implementing the UtxoLedgerTokenStateObserver, this observer will generate fungible states/tokens for +each produced gold state when persisting a finalized transaction to the vault. + */ +class GoldStateObserver: UtxoLedgerTokenStateObserver{ + override fun getStateType(): Class { + return GoldState::class.java + } + + override fun onCommit(state: GoldState, digestService: DigestService): UtxoToken { + //generate a pool with key - type, issuer and symbol to mint the tokens + val poolKey = UtxoTokenPoolKey(GoldState::class.java.getName(), state.issuer, state.symbol) + return UtxoToken(poolKey, state.amount, UtxoTokenFilterFields(null, state.owner)) + } + +} \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/gradle.properties b/kotlin-samples/shinny-tokens/gradle.properties new file mode 100644 index 0000000..282b05a --- /dev/null +++ b/kotlin-samples/shinny-tokens/gradle.properties @@ -0,0 +1,37 @@ +kotlin.code.style=official + +# Specify the version of the Corda-API to use. +# This needs to match the version supported by the Corda Cluster the CorDapp will run on. +cordaApiVersion=5.0.0.765 + +# Specify the version of the notary plugins to use. +# Currently packaged as part of corda-runtime-os, so should be set to a corda-runtime-os version. +cordaNotaryPluginsVersion=5.0.0.0 + +# Specify the version of the Combined Worker to use +combinedWorkerJarVersion=5.0.0.0 + +# Specify the version of the cordapp-cpb and cordapp-cpk plugins +cordaPluginsVersion=7.0.3 + +# Specify the version of the CSDE gradle plugin to use +csdePluginVersion=1.1.0 + +# Specify the name of the workflows module +workflowsModule=workflows + +# For the time being this just needs to be set to a dummy value. +platformVersion = 999 + +# Version of Kotlin to use. +# We recommend using a version close to that used by Corda-API. +kotlinVersion = 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a/kotlin-samples/shinny-tokens/gradlew b/kotlin-samples/shinny-tokens/gradlew new file mode 100755 index 0000000..65dcd68 --- /dev/null +++ b/kotlin-samples/shinny-tokens/gradlew @@ -0,0 +1,244 @@ +#!/bin/sh + +# +# Copyright © 2015-2021 the original authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +############################################################################## +# +# Gradle start up script for POSIX generated by Gradle. +# +# Important for running: +# +# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is +# noncompliant, but you have some other compliant shell such as ksh or +# bash, then to run this script, type that shell name before the whole +# command line, like: +# +# ksh Gradle +# +# Busybox and similar reduced shells will NOT work, because this script +# requires all of these POSIX shell features: +# * functions; +# * expansions «$var», «${var}», «${var:-default}», «${var+SET}», +# «${var#prefix}», «${var%suffix}», and «$( cmd )»; +# * compound commands having a testable exit status, especially «case»; +# * various built-in commands including «command», «set», and «ulimit». +# +# Important for patching: +# +# (2) This script targets any POSIX shell, so it avoids extensions provided +# by Bash, Ksh, etc; in particular arrays are avoided. +# +# The "traditional" practice of packing multiple parameters into a +# space-separated string is a well documented source of bugs and security +# problems, so this is (mostly) avoided, by progressively accumulating +# options in "$@", and eventually passing that to Java. +# +# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, +# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; +# see the in-line comments for details. +# +# There are tweaks for specific operating systems such as AIX, CygWin, +# Darwin, MinGW, and NonStop. +# +# (3) This script is generated from the Groovy template +# https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt +# within the Gradle project. +# +# You can find Gradle at https://github.com/gradle/gradle/. +# +############################################################################## + +# Attempt to set APP_HOME + +# Resolve links: $0 may be a link +app_path=$0 + +# Need this for daisy-chained symlinks. +while + APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path + [ -h "$app_path" ] +do + ls=$( ls -ld "$app_path" ) + link=${ls#*' -> '} + case $link in #( + /*) app_path=$link ;; #( + *) app_path=$APP_HOME$link ;; + esac +done + +# This is normally unused +# shellcheck disable=SC2034 +APP_BASE_NAME=${0##*/} +APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD=$JAVA_HOME/jre/sh/java + else + JAVACMD=$JAVA_HOME/bin/java + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC3045 + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC3045 + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + +# Collect all arguments for the java command; +# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of +# shell script including quotes and variable substitutions, so put them in +# double quotes to make sure that they get re-expanded; and +# * put everything else in single quotes, so that it's not re-expanded. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Stop when "xargs" is not available. +if ! command -v xargs >/dev/null 2>&1 +then + die "xargs is not available" +fi + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/kotlin-samples/shinny-tokens/gradlew.bat b/kotlin-samples/shinny-tokens/gradlew.bat new file mode 100644 index 0000000..6689b85 --- /dev/null +++ b/kotlin-samples/shinny-tokens/gradlew.bat @@ -0,0 +1,92 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%"=="" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%"=="" set DIRNAME=. +@rem This is normally unused +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if %ERRORLEVEL% equ 0 goto execute + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* + +:end +@rem End local scope for the variables with windows NT shell +if %ERRORLEVEL% equ 0 goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +set EXIT_CODE=%ERRORLEVEL% +if %EXIT_CODE% equ 0 set EXIT_CODE=1 +if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE% +exit /b %EXIT_CODE% + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/kotlin-samples/shinny-tokens/settings.gradle b/kotlin-samples/shinny-tokens/settings.gradle new file mode 100644 index 0000000..9c835cf --- /dev/null +++ b/kotlin-samples/shinny-tokens/settings.gradle @@ -0,0 +1,26 @@ +pluginManagement { + // Declare the repositories where plugins are stored. + repositories { + gradlePluginPortal() + mavenCentral() + mavenLocal() + } + + // The plugin dependencies with versions of the plugins congruent with the specified CorDapp plugin version, + // Corda API version, and Kotlin version. + plugins { + id 'net.corda.plugins.cordapp-cpk2' version cordaPluginsVersion + id 'net.corda.plugins.cordapp-cpb2' version cordaPluginsVersion + id 'net.corda.cordapp.cordapp-configuration' version cordaApiVersion + id 'net.corda.plugins.csde' version csdePluginVersion + id 'org.jetbrains.kotlin.jvm' version kotlinVersion + id 'org.jetbrains.kotlin.plugin.jpa' version kotlinVersion + id 'org.jetbrains.kotlin.plugin.allopen' version kotlinVersion + } +} + +// Root project name, used in naming the project as a whole and used in naming objects built by the project. +rootProject.name = 'corda5-token-sample-kotlin' +include ':workflows' +include ':contracts' + diff --git a/kotlin-samples/shinny-tokens/workflows/build.gradle b/kotlin-samples/shinny-tokens/workflows/build.gradle new file mode 100644 index 0000000..c1cb258 --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/build.gradle @@ -0,0 +1,84 @@ +plugins { + // Include the cordapp-cpb plugin. This automatically includes the cordapp-cpk plugin as well. + // These extend existing build environment so that CPB and CPK files can be built. + // This includes a CorDapp DSL that allows the developer to supply metadata for the CorDapp + // required by Corda. + id 'net.corda.plugins.cordapp-cpb2' + id 'org.jetbrains.kotlin.jvm' + id 'maven-publish' +} + +// Declare dependencies for the modules we will use. +// A cordaProvided declaration is required for anything that we use that the Corda API provides. +// This is required to allow us to build CorDapp modules as OSGi bundles that CPI and CPB files are built on. +dependencies { + // From other subprojects: + cordapp project(':contracts') + + cordaProvided 'org.jetbrains.kotlin:kotlin-osgi-bundle' + + // Declare a "platform" so that we use the correct set of dependency versions for the version of the + // Corda API specified. + cordaProvided platform("net.corda:corda-api:$cordaApiVersion") + + // If using transistive dependencies this will provide most of Corda-API: + // cordaProvided 'net.corda:corda-application' + + // Alternatively we can explicitly specify all our Corda-API dependencies: + cordaProvided 'net.corda:corda-base' + cordaProvided 'net.corda:corda-application' + cordaProvided 'net.corda:corda-crypto' + cordaProvided 'net.corda:corda-membership' + // cordaProvided 'net.corda:corda-persistence' + cordaProvided 'net.corda:corda-serialization' + cordaProvided 'net.corda:corda-ledger-utxo' + cordaProvided 'net.corda:corda-ledger-consensual' + + // CorDapps that use the UTXO ledger must include at least one notary client plugin + cordapp "com.r3.corda.notary.plugin.nonvalidating:notary-plugin-non-validating-client:$cordaNotaryPluginsVersion" + + // The CorDapp uses the slf4j logging framework. Corda-API provides this so we need a 'cordaProvided' declaration. + cordaProvided 'org.slf4j:slf4j-api' + + // 3rd party libraries + // Required + testImplementation "org.slf4j:slf4j-simple:2.0.0" + testImplementation "org.junit.jupiter:junit-jupiter:$junitVersion" + testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion" + + // Optional but used by example tests. + testImplementation "org.mockito:mockito-core:$mockitoVersion" + testImplementation "org.mockito.kotlin:mockito-kotlin:$mockitoKotlinVersion" + testImplementation "org.hamcrest:hamcrest-library:$hamcrestVersion" + +} + +// The CordApp section. +// This is part of the DSL provided by the corda plugins to define metadata for our CorDapp. +// Each component of the CorDapp would get its own CorDapp section in the build.gradle file for the component’s +// subproject. +// This is required by the corda plugins to build the CorDapp. +cordapp { + // "targetPlatformVersion" and "minimumPlatformVersion" are intended to specify the preferred + // and earliest versions of the Corda platform that the CorDapp will run on respectively. + // Enforced versioning has not implemented yet so we need to pass in a dummy value for now. + // The platform version will correspond to and be roughly equivalent to the Corda API version. + targetPlatformVersion = platformVersion.toInteger() + minimumPlatformVersion = platformVersion.toInteger() + + // The cordapp section contains either a workflow or contract subsection depending on the type of component. + // Declares the type and metadata of the CPK (this CPB has one CPK). + workflow { + name "WorkflowsModuleNameHere" + versionId 1 + vendor "VendorNameHere" + } +} + +publishing { + publications { + maven(MavenPublication) { + from components.cordapp + } + } +} diff --git a/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.kt b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.kt new file mode 100644 index 0000000..bf3af86 --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.kt @@ -0,0 +1,181 @@ +package com.r3.developers.samples.tokens.workflows + +import com.r3.developers.samples.tokens.contracts.GoldContract +import com.r3.developers.samples.tokens.states.GoldState +import net.corda.v5.application.crypto.DigestService +import net.corda.v5.application.flows.ClientRequestBody +import net.corda.v5.application.flows.ClientStartableFlow +import net.corda.v5.application.flows.CordaInject +import net.corda.v5.application.flows.FlowEngine +import net.corda.v5.application.marshalling.JsonMarshallingService +import net.corda.v5.application.membership.MemberLookup +import net.corda.v5.base.annotations.Suspendable +import net.corda.v5.base.exceptions.CordaRuntimeException +import net.corda.v5.base.types.MemberX500Name +import net.corda.v5.crypto.DigestAlgorithmName +import net.corda.v5.crypto.SecureHash +import net.corda.v5.ledger.common.NotaryLookup +import net.corda.v5.ledger.utxo.StateRef +import net.corda.v5.ledger.utxo.UtxoLedgerService +import net.corda.v5.ledger.utxo.token.selection.ClaimedToken +import net.corda.v5.ledger.utxo.token.selection.TokenClaim +import net.corda.v5.ledger.utxo.token.selection.TokenClaimCriteria +import net.corda.v5.ledger.utxo.token.selection.TokenSelection +import net.corda.v5.ledger.utxo.transaction.UtxoTransactionBuilder +import net.corda.v5.membership.MemberInfo +import org.slf4j.LoggerFactory +import java.math.BigDecimal +import java.time.Duration +import java.time.Instant +import java.util.* +import java.util.stream.Collectors + +class BurnGoldTokenFlow : ClientStartableFlow{ + + private companion object { + val log = LoggerFactory.getLogger(this::class.java.enclosingClass) + } + + @CordaInject + lateinit var jsonMarshallingService: JsonMarshallingService + + @CordaInject + lateinit var memberLookup: MemberLookup + + @CordaInject + lateinit var notaryLookup: NotaryLookup + + @CordaInject + lateinit var tokenSelection: TokenSelection + + @CordaInject + lateinit var ledgerService: UtxoLedgerService + + @CordaInject + lateinit var flowEngine: FlowEngine + + @CordaInject + lateinit var digestService: DigestService + + @Suspendable + override fun call(requestBody: ClientRequestBody): String { + var tokenClaim: TokenClaim? = null + var totalAmount: BigDecimal? = null + var change: BigDecimal? = null + try{ + val (symbol, issuer, amount) = requestBody.getRequestBodyAs( + jsonMarshallingService, BurnGoldTokenFLowArgs::class.java + ) + val myInfo = memberLookup.myInfo() + + // Get the issuer of the token + val issuerMember = Objects.requireNonNull( + memberLookup.lookup(issuer), + "MemberLookup can't find issuer specified in flow arguments." + ) + + val notary = notaryLookup.notaryServices.iterator().next() + + // Create the token claim criteria by specifying the issuer and amount + val tokenClaimCriteria = TokenClaimCriteria( + GoldState::class.java.getName(), + getSecureHash(issuerMember.name.commonName!!), + notary.name, + symbol, + BigDecimal(amount) + ) + + // tryClaim will check in the vault if there are tokens which can satisfy the expected amount. + // If yes all the fungible tokens are returned back. + // Remaining change will be returned back to the sender. + tokenClaim = tokenSelection.tryClaim(tokenClaimCriteria) + + + if (tokenClaim == null) { + log.info("No tokens found for" + jsonMarshallingService.format(tokenClaimCriteria)) + return "No Tokens Found" + } + + val claimedTokenList = tokenClaim.claimedTokens + + // calculate the change to be given back to the sender + totalAmount = claimedTokenList.stream().map({ obj: ClaimedToken -> obj.getAmount() }) + .reduce(BigDecimal.ZERO, { obj: BigDecimal, augend: BigDecimal? -> obj.add(augend) }) + change = totalAmount.subtract(BigDecimal(amount)) + + log.info( + "Found total " + totalAmount + " amount of tokens for " + + jsonMarshallingService.format(tokenClaimCriteria) + ) + + + val txBuilder : UtxoTransactionBuilder = + if (change.compareTo(BigDecimal.ZERO) > 0) { + // if there is change to be returned back to the sender, create a new gold state + // representing the original sender and the change. + val goldStateChange = GoldState( + getSecureHash(issuerMember.name.commonName!!), + getSecureHash(myInfo.name.commonName!!), + symbol, change, + listOf(myInfo.ledgerKeys[0]) + ) + ledgerService.createTransactionBuilder() + .setNotary(notary.name) + .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) + .addInputStates( + tokenClaim.claimedTokens.stream().map{ it.stateRef }.collect(Collectors.toList())) + .addOutputStates(goldStateChange) + .addCommand(GoldContract.Burn()) + .addSignatories(listOf(myInfo.ledgerKeys[0])) + } else { + // if there is no change, no need to create state representing the change to be given back to the sender. + ledgerService.createTransactionBuilder() + .setNotary(notary.name) + .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) + .addInputStates( + tokenClaim.claimedTokens.stream().map{ it.stateRef }.collect(Collectors.toList())) + .addCommand(GoldContract.Burn()) + .addSignatories(listOf(myInfo.ledgerKeys[0])) + } + + val signedTransaction = txBuilder.toSignedTransaction() + + val finalizedSignedTransaction = ledgerService.finalize( + signedTransaction, mutableListOf() + ).transaction + + val result = finalizedSignedTransaction.id.toString() + log.info("Success! Response: $result") + + }catch (e: Exception){ + log.warn("Failed to process utxo flow for request body " + requestBody + " because: " + e.message) + + log.info("Released the claim on the token states, indicating we spent none of them") + // None of the tokens were used, so release all the claimed tokens + tokenClaim!!.useAndRelease(mutableListOf()) + + throw CordaRuntimeException(e.message) + }finally { + // Remove any used tokens from the cache and unlocks any remaining tokens for other flows to claim. + if (tokenClaim != null) { + log.info("Release the claim on the token states, indicating we spent them all") + tokenClaim.useAndRelease(tokenClaim.getClaimedTokens().stream().map{ obj: ClaimedToken -> obj.stateRef } + .collect(Collectors.toList())) + return "Total Available amount of Tokens before burn action : " + totalAmount + + " Amount burned: " + totalAmount?.subtract(change) + " Change to be given back to the owner: " + change + } + return "No Tokens Found" + } + } + + @Suspendable + private fun getSecureHash(commonName: String): SecureHash { + return digestService.hash(commonName.toByteArray(), DigestAlgorithmName.SHA2_256) + } +} + +data class BurnGoldTokenFLowArgs( + var symbol: String, + var issuer: MemberX500Name, + var amount: String +) \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenResponderFlow.kt b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenResponderFlow.kt new file mode 100644 index 0000000..1250744 --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenResponderFlow.kt @@ -0,0 +1,43 @@ +package com.r3.developers.samples.tokens.workflows + +import net.corda.v5.application.flows.CordaInject +import net.corda.v5.application.flows.InitiatedBy +import net.corda.v5.application.flows.ResponderFlow +import net.corda.v5.application.messaging.FlowSession +import net.corda.v5.base.annotations.Suspendable +import net.corda.v5.ledger.utxo.UtxoLedgerService +import net.corda.v5.ledger.utxo.transaction.UtxoLedgerTransaction +import net.corda.v5.ledger.utxo.transaction.UtxoSignedTransaction +import net.corda.v5.ledger.utxo.transaction.UtxoTransactionValidator +import org.slf4j.LoggerFactory + +//@InitiatingBy declares the protocol which will be used to link the initiator to the responder. +@InitiatedBy(protocol = "finalize-gold-protocol") +class FinalizeGoldTokenResponderFlow : ResponderFlow { + + private companion object { + val log = LoggerFactory.getLogger(this::class.java.enclosingClass) + } + + // Injects the UtxoLedgerService to enable the flow to make use of the Ledger API. + @CordaInject + lateinit var ledgerService: UtxoLedgerService + @Suspendable + override fun call(session: FlowSession) { + + log.info("FinalizeMintResponderFlow.call() called") + + try { + // Calls receiveFinality() function which provides the responder to the finalise() function + // in the Initiating Flow. Accepts a lambda validator containing the business logic to decide whether + // responder should sign the Transaction. + val finalizedSignedTransaction = ledgerService.receiveFinality(session, {}).transaction + log.info("Finished responder flow - " + finalizedSignedTransaction.id) + + } + // Soft fails the flow and log the exception. + catch (e: Exception){ + log.warn("Exceptionally finished responder flow", e) + } + } +} \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenSubFlow.kt b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenSubFlow.kt new file mode 100644 index 0000000..cc619fa --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/FinalizeGoldTokenSubFlow.kt @@ -0,0 +1,57 @@ +package com.r3.developers.samples.tokens.workflows + +import net.corda.v5.application.flows.CordaInject +import net.corda.v5.application.flows.InitiatingFlow +import net.corda.v5.application.flows.SubFlow +import net.corda.v5.application.messaging.FlowMessaging +import net.corda.v5.base.annotations.Suspendable +import net.corda.v5.base.types.MemberX500Name +import net.corda.v5.ledger.utxo.UtxoLedgerService +import net.corda.v5.ledger.utxo.transaction.UtxoSignedTransaction +import org.slf4j.LoggerFactory + +@InitiatingFlow(protocol = "finalize-gold-protocol") +class FinalizeGoldTokenSubFlow( + private val signedTransaction: UtxoSignedTransaction, + private val otherMember: MemberX500Name +) : SubFlow { + private companion object { + val log = LoggerFactory.getLogger(this::class.java.enclosingClass) + } + + @CordaInject + lateinit var ledgerService: UtxoLedgerService + + @CordaInject + lateinit var flowMessaging: FlowMessaging + + @Suspendable + override fun call(): String { + log.info("FinalizeMintSubFlow.call() called") + + // Initiates a session with the other Member. + val session = flowMessaging.initiateFlow(otherMember) + + // Calls the Corda provided finalise() function which gather signatures from the counterparty, + // notarises the transaction and persists the transaction to each party's vault. + // On success returns the id of the transaction created. + var result: String + try{ + val sessionsList = listOf(session) + val finalizedSignedTransaction = ledgerService.finalize( + signedTransaction, + sessionsList + ).transaction + + result = finalizedSignedTransaction.id.toString() + log.info("Success! Response: $result") + } + // Soft fails the flow and returns the error message without throwing a flow exception. + catch (e: Exception){ + log.warn("Finality failed", e) + result = "Finality failed, " + e.message + } + // Returns the transaction id converted as a string + return result + } +} \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/IssueGoldTokenFlow.kt b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/IssueGoldTokenFlow.kt new file mode 100644 index 0000000..d359198 --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/IssueGoldTokenFlow.kt @@ -0,0 +1,124 @@ +package com.r3.developers.samples.tokens.workflows + +import com.r3.developers.samples.tokens.contracts.GoldContract.Issue +import com.r3.developers.samples.tokens.states.GoldState +import net.corda.v5.application.crypto.DigestService +import net.corda.v5.application.flows.ClientRequestBody +import net.corda.v5.application.flows.ClientStartableFlow +import net.corda.v5.application.flows.CordaInject +import net.corda.v5.application.flows.FlowEngine +import net.corda.v5.application.marshalling.JsonMarshallingService +import net.corda.v5.application.membership.MemberLookup +import net.corda.v5.base.annotations.Suspendable +import net.corda.v5.base.exceptions.CordaRuntimeException +import net.corda.v5.base.types.MemberX500Name +import net.corda.v5.crypto.DigestAlgorithmName +import net.corda.v5.crypto.SecureHash +import net.corda.v5.ledger.common.NotaryLookup +import net.corda.v5.ledger.utxo.UtxoLedgerService +import net.corda.v5.membership.MemberInfo +import org.slf4j.LoggerFactory +import java.math.BigDecimal +import java.security.PublicKey +import java.time.Duration +import java.time.Instant +import java.util.* + +class IssueGoldTokenFlow : ClientStartableFlow { + + private companion object { + val log = LoggerFactory.getLogger(this::class.java.enclosingClass) + } + + @CordaInject + lateinit var jsonMarshallingService: JsonMarshallingService + + @CordaInject + lateinit var memberLookup: MemberLookup + + @CordaInject + lateinit var ledgerService: UtxoLedgerService + + @CordaInject + lateinit var notaryLookup: NotaryLookup + + @CordaInject + lateinit var flowEngine: FlowEngine + + @CordaInject + lateinit var digestService: DigestService + + @Suspendable + override fun call(requestBody: ClientRequestBody): String { + try{ + + // Obtain the deserialized input arguments to the flow from the requestBody. + val (symbol, amount, owner) = requestBody.getRequestBodyAs( + jsonMarshallingService, + IssueGoldTokenFlowArgs::class.java + ) + + // Get MemberInfos for the Vnode running the flow and the issuerMember. + val myInfo = memberLookup.myInfo() + val ownerMember = Objects.requireNonNull( + memberLookup.lookup(owner), + "MemberLookup can't find owner specified in flow arguments." + ) + + // Obtain the Notary + val notary = notaryLookup.notaryServices.iterator().next() + + val goldState = GoldState( + getSecureHash(myInfo.name.commonName!!), + getSecureHash(ownerMember.name.commonName!!), + symbol, + BigDecimal(amount), listOf(ownerMember.ledgerKeys[0]) + ) + + + // Use UTXOTransactionBuilder to build up the draft transaction. + val txBuilder = ledgerService.createTransactionBuilder() + .setNotary(notary.name) + .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) + .addOutputState(goldState) + .addCommand(Issue()) + .addSignatories(myInfo.ledgerKeys[0]) + + // Convert the transaction builder to a UTXOSignedTransaction. Verifies the content of the + // UtxoTransactionBuilder and signs the transaction with any required signatories that belong to + // the current node. + val signedTransaction = txBuilder.toSignedTransaction() + + return flowEngine.subFlow(FinalizeGoldTokenSubFlow(signedTransaction, ownerMember.name)) + + }catch (e: Exception){ + log.warn("Failed to process utxo flow for request body " + requestBody + " because: " + e.message) + throw CordaRuntimeException(e.message) + } + } + + @Suspendable + private fun getSecureHash(commonName: String): SecureHash { + return digestService.hash(commonName.toByteArray(), DigestAlgorithmName.SHA2_256) + } + +} + +/* +RequestBody for triggering the flow via REST: +{ + "clientRequestId": "mint-1", + "flowClassName": "com.r3.developers.samples.tokens.workflows.IssueGoldTokensFlow", + "requestBody": { + "symbol": "GOLD", + "owner": "CN=Bob, OU=Test Dept, O=R3, L=London, C=GB", + "amount": "20" + } +} + */ + +data class IssueGoldTokenFlowArgs( + val symbol: String, + val amount: String, + val owner: MemberX500Name +) \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/ListGoldTokens.kt b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/ListGoldTokens.kt new file mode 100644 index 0000000..9fc32e7 --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/ListGoldTokens.kt @@ -0,0 +1,64 @@ +package com.r3.developers.samples.tokens.workflows + +import com.r3.developers.samples.tokens.states.GoldState +import net.corda.v5.application.flows.ClientRequestBody +import net.corda.v5.application.flows.ClientStartableFlow +import net.corda.v5.application.flows.CordaInject +import net.corda.v5.application.marshalling.JsonMarshallingService +import net.corda.v5.base.annotations.Suspendable +import net.corda.v5.crypto.SecureHash +import net.corda.v5.ledger.utxo.UtxoLedgerService +import org.slf4j.LoggerFactory +import java.math.BigDecimal +import java.util.stream.Collectors + +// This flow is used to list all the gold tokens available in the vault. +class ListGoldTokens: ClientStartableFlow { + + private companion object { + val log = LoggerFactory.getLogger(this::class.java.enclosingClass) + } + + @CordaInject + lateinit var jsonMarshallingService: JsonMarshallingService + + // Injects the UtxoLedgerService to enable the flow to make use of the Ledger API. + @CordaInject + lateinit var utxoLedgerService: UtxoLedgerService + + @Suspendable + override fun call(requestBody: ClientRequestBody): String { + val states = utxoLedgerService.findUnconsumedStatesByType( + GoldState::class.java + ) + + // Queries the VNode's vault for unconsumed states and converts the result to a serializable DTO. + val results = states.stream().map{ + GoldStateList( + it.state.contractState.issuer, + it.state.contractState.symbol, + it.state.contractState.amount, + it.state.contractState.owner + ) + }.collect(Collectors.toList()) + // Uses the JsonMarshallingService's format() function to serialize the DTO to Json. + return jsonMarshallingService.format(results) + } +} + +/* +RequestBody for triggering the flow via http-rpc: +{ + "clientRequestId": "list-1", + "flowClassName": "com.r3.developers.samples.tokens.workflows.ListGoldTokens", + "requestBody": {} +} +*/ + + +data class GoldStateList( + val issuer: SecureHash, + val symbol: String, + val amount: BigDecimal, + val owner: SecureHash +) \ No newline at end of file diff --git a/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/TransferGoldTokenFlow.kt b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/TransferGoldTokenFlow.kt new file mode 100644 index 0000000..467b40f --- /dev/null +++ b/kotlin-samples/shinny-tokens/workflows/src/main/kotlin/com/r3/developers/samples/tokens/workflows/TransferGoldTokenFlow.kt @@ -0,0 +1,195 @@ +package com.r3.developers.samples.tokens.workflows + +import com.r3.developers.samples.tokens.contracts.GoldContract.Transfer +import com.r3.developers.samples.tokens.states.GoldState +import net.corda.v5.application.crypto.DigestService +import net.corda.v5.application.flows.ClientRequestBody +import net.corda.v5.application.flows.ClientStartableFlow +import net.corda.v5.application.flows.CordaInject +import net.corda.v5.application.flows.FlowEngine +import net.corda.v5.application.marshalling.JsonMarshallingService +import net.corda.v5.application.membership.MemberLookup +import net.corda.v5.base.annotations.Suspendable +import net.corda.v5.base.exceptions.CordaRuntimeException +import net.corda.v5.base.types.MemberX500Name +import net.corda.v5.crypto.DigestAlgorithmName +import net.corda.v5.crypto.SecureHash +import net.corda.v5.ledger.common.NotaryLookup +import net.corda.v5.ledger.utxo.StateRef +import net.corda.v5.ledger.utxo.UtxoLedgerService +import net.corda.v5.ledger.utxo.token.selection.ClaimedToken +import net.corda.v5.ledger.utxo.token.selection.TokenClaim +import net.corda.v5.ledger.utxo.token.selection.TokenClaimCriteria +import net.corda.v5.ledger.utxo.token.selection.TokenSelection +import net.corda.v5.ledger.utxo.transaction.UtxoTransactionBuilder +import net.corda.v5.membership.MemberInfo +import org.slf4j.LoggerFactory +import java.math.BigDecimal +import java.time.Duration +import java.time.Instant +import java.util.* +import java.util.stream.Collectors + +// This flow will be triggered by Bob to transfer some of his tokens to Charlie. The remaining +// amount of tokens will be given back as change to Bob. +class TransferGoldTokenFlow : ClientStartableFlow{ + + private companion object { + val log = LoggerFactory.getLogger(this::class.java.enclosingClass) + } + + @CordaInject + lateinit var jsonMarshallingService: JsonMarshallingService + + @CordaInject + lateinit var memberLookup: MemberLookup + + @CordaInject + lateinit var notaryLookup: NotaryLookup + + @CordaInject + lateinit var tokenSelection: TokenSelection + + @CordaInject + lateinit var ledgerService: UtxoLedgerService + + @CordaInject + lateinit var flowEngine: FlowEngine + + @CordaInject + lateinit var digestService: DigestService + + @Suspendable + override fun call(requestBody: ClientRequestBody): String { + var tokenClaim: TokenClaim? = null + var totalAmount: BigDecimal? = null + var change: BigDecimal? = null + try{ + val (symbol, issuer, amount, receiver) = requestBody.getRequestBodyAs( + jsonMarshallingService, TransferGoldFlowInputArgs::class.java + ) + val myInfo = memberLookup.myInfo() + + // Take the receiver of the token whom Bob will transfer the token + val receiverMember = Objects.requireNonNull( + memberLookup.lookup(receiver), + "MemberLookup can't find otherMember specified in flow arguments." + ) + + // Get the issuer of the token + val issuerMember = Objects.requireNonNull( + memberLookup.lookup(issuer), + "MemberLookup can't find otherMember specified in flow arguments." + ) + + val notary = notaryLookup.notaryServices.iterator().next() + + // Create the token claim criteria by specifying the issuer and amount + val tokenClaimCriteria = TokenClaimCriteria( + GoldState::class.java.getName(), + getSecureHash(issuerMember.name.commonName!!), + notary.name, + symbol, + BigDecimal(amount) + ) + + // tryClaim will check in the vault if there are tokens which can satisfy the expected amount. + // If yes all the fungible tokens are returned back. + // Remaining change will be returned back to the sender. + tokenClaim = tokenSelection.tryClaim(tokenClaimCriteria) + + if (tokenClaim == null) { + log.info("No tokens found for" + jsonMarshallingService.format(tokenClaimCriteria)) + return "No Tokens Found" + } + + val claimedTokenList = tokenClaim.claimedTokens + + // calculate the change to be given back to the sender + totalAmount = claimedTokenList.stream().map({ obj: ClaimedToken -> obj.getAmount() }) + .reduce(BigDecimal.ZERO, { obj: BigDecimal, augend: BigDecimal? -> obj.add(augend) }) + change = totalAmount.subtract(BigDecimal(amount)) + + log.info( + "Found total " + totalAmount + " amount of tokens for " + + jsonMarshallingService.format(tokenClaimCriteria) + ) + + // create a new state representing the new owner and the expected amount. + val goldStateNew = GoldState( + getSecureHash(issuerMember.name.commonName!!), + getSecureHash(receiverMember.name.commonName!!), + symbol, + BigDecimal(amount), + listOf(receiverMember.ledgerKeys[0]) + ) + + val txBuilder : UtxoTransactionBuilder = + if (change.compareTo(BigDecimal.ZERO) > 0) { + // if there is change to be returned back to the sender, create a new gold state + // representing the original sender and the change. + val goldStateChange = GoldState( + getSecureHash(issuerMember.name.commonName!!), + getSecureHash(myInfo.name.commonName!!), + symbol, change, + listOf(myInfo.ledgerKeys[0]) + ) + ledgerService.createTransactionBuilder() + .setNotary(notary.name) + .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) + .addInputStates( + tokenClaim.claimedTokens.stream().map{ it.stateRef }.collect(Collectors.toList())) + .addOutputStates(goldStateChange, goldStateNew) + .addCommand(Transfer()) + .addSignatories(listOf(myInfo.ledgerKeys[0], receiverMember.ledgerKeys[0])) + } else { + // if there is no change, no need to create state representing the change to be given back to the sender. + ledgerService.createTransactionBuilder() + .setNotary(notary.name) + .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) + .addInputStates( + tokenClaim.claimedTokens.stream().map{ it.stateRef }.collect(Collectors.toList())) + .addOutputStates(goldStateNew) + .addCommand(Transfer()) + .addSignatories(listOf(myInfo.ledgerKeys[0], receiverMember.ledgerKeys[0])) + } + + val signedTransaction = txBuilder.toSignedTransaction() + + flowEngine.subFlow(FinalizeGoldTokenSubFlow(signedTransaction, receiverMember.name)) + + }catch (e: Exception){ + log.warn("Failed to process utxo flow for request body " + requestBody + " because: " + e.message) + + log.info("Released the claim on the token states, indicating we spent none of them") + // None of the tokens were used, so release all the claimed tokens + tokenClaim!!.useAndRelease(mutableListOf()) + + throw CordaRuntimeException(e.message) + }finally { + // Remove any used tokens from the cache and unlocks any remaining tokens for other flows to claim. + if (tokenClaim != null) { + log.info("Release the claim on the token states, indicating we spent them all") + tokenClaim.useAndRelease(tokenClaim.getClaimedTokens().stream().map{ obj: ClaimedToken -> obj.stateRef } + .collect(Collectors.toList())) + return "Total Available amount of Tokens before transfer : " + totalAmount + + " change to be given back to the owner : " + change + " Total amount transferred " + + totalAmount?.subtract(change) + } + return "No Tokens Found" + } + } + + @Suspendable + private fun getSecureHash(commonName: String): SecureHash { + return digestService.hash(commonName.toByteArray(), DigestAlgorithmName.SHA2_256) + } + +} + +data class TransferGoldFlowInputArgs( + val symbol: String, + val issuer: MemberX500Name, + val amount: String, + val receiver: MemberX500Name +) \ No newline at end of file From 961b42f8b1b75294bd5eb9aa99668e49ba1994bf Mon Sep 17 00:00:00 2001 From: Ashutosh Meher Date: Wed, 30 Aug 2023 16:23:06 +0530 Subject: [PATCH 2/2] update command in java sample --- .../r3/developers/samples/tokens/contracts/GoldContract.java | 2 ++ .../samples/tokens/workflows/BurnGoldTokenFlow.java | 4 ++-- kotlin-samples/shinny-tokens/README.md | 2 +- 3 files changed, 5 insertions(+), 3 deletions(-) diff --git a/java-samples/shinny-tokens/contracts/src/main/java/com/r3/developers/samples/tokens/contracts/GoldContract.java b/java-samples/shinny-tokens/contracts/src/main/java/com/r3/developers/samples/tokens/contracts/GoldContract.java index 8cdcf27..cf03edc 100644 --- a/java-samples/shinny-tokens/contracts/src/main/java/com/r3/developers/samples/tokens/contracts/GoldContract.java +++ b/java-samples/shinny-tokens/contracts/src/main/java/com/r3/developers/samples/tokens/contracts/GoldContract.java @@ -15,6 +15,8 @@ public static class Issue implements Command { } public static class Transfer implements Command { } + public static class Burn implements Command { } + @Override public void verify(UtxoLedgerTransaction transaction) { diff --git a/java-samples/shinny-tokens/workflows/src/main/java/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.java b/java-samples/shinny-tokens/workflows/src/main/java/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.java index eb91306..fd9aaee 100644 --- a/java-samples/shinny-tokens/workflows/src/main/java/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.java +++ b/java-samples/shinny-tokens/workflows/src/main/java/com/r3/developers/samples/tokens/workflows/BurnGoldTokenFlow.java @@ -127,7 +127,7 @@ public String call(@NotNull ClientRequestBody requestBody) { .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) .addInputStates(tokenClaim.getClaimedTokens().stream().map(ClaimedToken::getStateRef).collect(Collectors.toList())) .addOutputStates(List.of(goldStateChange)) - .addCommand(new GoldContract.Transfer()) + .addCommand(new GoldContract.Burn()) .addSignatories(Collections.singletonList(myInfo.getLedgerKeys().get(0))); } else { // if there is no change, no need to create state representing the change to be given back to the sender. @@ -135,7 +135,7 @@ public String call(@NotNull ClientRequestBody requestBody) { .setNotary(notary.getName()) .setTimeWindowBetween(Instant.now(), Instant.now().plusMillis(Duration.ofDays(1).toMillis())) .addInputStates(tokenClaim.getClaimedTokens().stream().map(ClaimedToken::getStateRef).collect(Collectors.toList())) - .addCommand(new GoldContract.Transfer()) + .addCommand(new GoldContract.Burn()) .addSignatories(Collections.singletonList(myInfo.getLedgerKeys().get(0))); } diff --git a/kotlin-samples/shinny-tokens/README.md b/kotlin-samples/shinny-tokens/README.md index a086b2c..72cc4e6 100644 --- a/kotlin-samples/shinny-tokens/README.md +++ b/kotlin-samples/shinny-tokens/README.md @@ -38,7 +38,7 @@ Go to `POST /flow/{holdingidentityshorthash}`, enter the identity short hash(Ali ``` { "clientRequestId": "issue-1", - "flowClassName": "com.r3.developers.samples.tokens.workflows.IssueGoldTokensFlow", + "flowClassName": "com.r3.developers.samples.tokens.workflows.IssueGoldTokenFlow", "requestBody": { "symbol": "GOLD", "owner": "CN=Bob, OU=Test Dept, O=R3, L=London, C=GB",