Implement a simple transaction graph visualiser tool.

build.gradle

@@ -33,9 +33,9 @@ dependencies {
     compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
     compile "com.google.guava:guava:18.0"
     compile "com.esotericsoftware:kryo:3.0.3"
-}
 
-sourceSets {
-    main.java.srcDirs += 'src'
-    test.java.srcDirs += 'tests'
+    // For visualisation
+    compile "org.graphstream:gs-core:1.3"
+    compile "org.graphstream:gs-ui:1.3"
+    compile "com.intellij:forms_rt:7.0.3"
 }

src/test/kotlin/contracts/CommercialPaperTests.kt

@@ -94,7 +94,7 @@ class CommercialPaperTests {
     // Generate a trade lifecycle with various parameters.
     private fun trade(redemptionTime: Instant = TEST_TX_TIME + 8.days,
                       aliceGetsBack: Amount = 1000.DOLLARS,
-                      destroyPaperAtRedemption: Boolean = true): TransactionGroupForTest<CommercialPaper.State> {
+                      destroyPaperAtRedemption: Boolean = true): TransactionGroupDSL<CommercialPaper.State> {
         val someProfits = 1200.DOLLARS
         return transactionGroupFor() {
             roots {

src/test/kotlin/contracts/CrowdFundTests.kt

@@ -50,7 +50,7 @@ class CrowdFundTests {
         raiseFunds().verify()
     }
 
-    private fun raiseFunds(): TransactionGroupForTest<CrowdFund.State> {
+    private fun raiseFunds(): TransactionGroupDSL<CrowdFund.State> {
         return transactionGroupFor<CrowdFund.State> {
             roots {
                 transaction(1000.DOLLARS.CASH `owned by` ALICE label "alice's $1000")
@@ -79,7 +79,7 @@ class CrowdFundTests {
             }
 
             // 3. Close the opportunity, assuming the target has been met
-            transaction(TEST_TX_TIME + 8.days) {
+            transaction(time = TEST_TX_TIME + 8.days) {
                 input ("pledged opportunity")
                 output ("funded and closed") { "pledged opportunity".output.copy(closed = true) }
                 arg(MINI_CORP_PUBKEY) { CrowdFund.Commands.Funded() }

src/test/kotlin/core/testutils/TestUtils.kt

@@ -210,8 +210,8 @@ open class TransactionForTest : AbstractTransactionForTest() {
 
 fun transaction(body: TransactionForTest.() -> Unit) = TransactionForTest().apply { body() }
 
-class TransactionGroupForTest<out T : ContractState>(private val stateType: Class<T>) {
-    open inner class LedgerTransactionForTest : AbstractTransactionForTest() {
+class TransactionGroupDSL<T : ContractState>(private val stateType: Class<T>) {
+    open inner class LedgerTransactionDSL : AbstractTransactionForTest() {
         private val inStates = ArrayList<ContractStateRef>()
 
         fun input(label: String) {
@@ -231,7 +231,7 @@ class TransactionGroupForTest<out T : ContractState>(private val stateType: Clas
 
     val String.output: T get() = labelToOutputs[this] ?: throw IllegalArgumentException("State with label '$this' was not found")
 
-    private inner class InternalLedgerTransactionForTest : LedgerTransactionForTest() {
+    private inner class InternalLedgerTransactionDSL : LedgerTransactionDSL() {
         fun finaliseAndInsertLabels(time: Instant): LedgerTransaction {
             val ltx = toLedgerTransaction(time)
             for ((index, labelledState) in outStates.withIndex()) {
@@ -240,6 +240,7 @@ class TransactionGroupForTest<out T : ContractState>(private val stateType: Clas
                     if (stateType.isInstance(labelledState.state)) {
                         labelToOutputs[labelledState.label] = labelledState.state as T
                     }
+                    outputsToLabels[labelledState.state] = labelledState.label
                 }
             }
             return ltx
@@ -249,34 +250,47 @@ class TransactionGroupForTest<out T : ContractState>(private val stateType: Clas
     private val rootTxns = ArrayList<LedgerTransaction>()
     private val labelToRefs = HashMap<String, ContractStateRef>()
     private val labelToOutputs = HashMap<String, T>()
+    private val outputsToLabels = HashMap<ContractState, String>()
+
+    fun labelForState(state: T): String? = outputsToLabels[state]
+
     inner class Roots {
         fun transaction(vararg outputStates: LabeledOutput) {
             val outs = outputStates.map { it.state }
             val wtx = WireTransaction(emptyList(), outs, emptyList())
             val ltx = wtx.toLedgerTransaction(TEST_TX_TIME, TEST_KEYS_TO_CORP_MAP, SecureHash.randomSHA256())
-            outputStates.forEachIndexed { index, labeledOutput -> labelToRefs[labeledOutput.label!!] = ContractStateRef(ltx.hash, index) }
+            for ((index, state) in outputStates.withIndex()) {
+                val label = state.label!!
+                labelToRefs[label] = ContractStateRef(ltx.hash, index)
+                outputsToLabels[state.state] = label
+            }
             rootTxns.add(ltx)
         }
 
         @Deprecated("Does not nest ", level = DeprecationLevel.ERROR)
         fun roots(body: Roots.() -> Unit) {}
         @Deprecated("Use the vararg form of transaction inside roots", level = DeprecationLevel.ERROR)
-        fun transaction(time: Instant = TEST_TX_TIME, body: LedgerTransactionForTest.() -> Unit) {}
+        fun transaction(time: Instant = TEST_TX_TIME, body: LedgerTransactionDSL.() -> Unit) {}
     }
     fun roots(body: Roots.() -> Unit) = Roots().apply { body() }
 
     val txns = ArrayList<LedgerTransaction>()
+    private val txnToLabelMap = HashMap<LedgerTransaction, String>()
 
-    fun transaction(time: Instant = TEST_TX_TIME, body: LedgerTransactionForTest.() -> Unit): LedgerTransaction {
-        val forTest = InternalLedgerTransactionForTest()
+    fun transaction(label: String? = null, time: Instant = TEST_TX_TIME, body: LedgerTransactionDSL.() -> Unit): LedgerTransaction {
+        val forTest = InternalLedgerTransactionDSL()
         forTest.body()
         val ltx = forTest.finaliseAndInsertLabels(time)
         txns.add(ltx)
+        if (label != null)
+            txnToLabelMap[ltx] = label
         return ltx
     }
 
+    fun labelForTransaction(ltx: LedgerTransaction): String? = txnToLabelMap[ltx]
+
     @Deprecated("Does not nest ", level = DeprecationLevel.ERROR)
-    fun transactionGroup(body: TransactionGroupForTest<T>.() -> Unit) {}
+    fun transactionGroup(body: TransactionGroupDSL<T>.() -> Unit) {}
 
     fun toTransactionGroup() = TransactionGroup(txns.map { it }.toSet(), rootTxns.toSet())
 
@@ -304,5 +318,5 @@ class TransactionGroupForTest<out T : ContractState>(private val stateType: Clas
     }
 }
 
-inline fun <reified T : ContractState> transactionGroupFor(body: TransactionGroupForTest<T>.() -> Unit) = TransactionGroupForTest<T>(T::class.java).apply { this.body() }
-fun transactionGroup(body: TransactionGroupForTest<ContractState>.() -> Unit) = TransactionGroupForTest(ContractState::class.java).apply { this.body() }
+inline fun <reified T : ContractState> transactionGroupFor(body: TransactionGroupDSL<T>.() -> Unit) = TransactionGroupDSL<T>(T::class.java).apply { this.body() }
+fun transactionGroup(body: TransactionGroupDSL<ContractState>.() -> Unit) = TransactionGroupDSL(ContractState::class.java).apply { this.body() }

src/test/kotlin/core/visualiser/GraphStream.kt

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2015, R3 CEV. All rights reserved.
+ */
+
+package core.visualiser
+
+import org.graphstream.graph.Edge
+import org.graphstream.graph.Element
+import org.graphstream.graph.Graph
+import org.graphstream.graph.Node
+import org.graphstream.graph.implementations.SingleGraph
+import org.graphstream.ui.layout.Layout
+import org.graphstream.ui.layout.springbox.implementations.SpringBox
+import org.graphstream.ui.swingViewer.DefaultView
+import org.graphstream.ui.view.Viewer
+import org.graphstream.ui.view.ViewerListener
+import java.util.*
+import javax.swing.JFrame
+import kotlin.reflect.KProperty
+
+// Some utilities to make the GraphStream API a bit nicer to work with. For some reason GS likes to use a non-type safe
+// string->value map type API for configuring common things. We fix it up here:
+
+class GSPropertyDelegate<T>(private val prefix: String) {
+    operator fun getValue(thisRef: Element, property: KProperty<*>): T = thisRef.getAttribute("$prefix.${property.name}")
+    operator fun setValue(thisRef: Element, property: KProperty<*>, value: T) = thisRef.setAttribute("$prefix.${property.name}", value)
+}
+
+var Node.label: String by GSPropertyDelegate<String>("ui")
+var Graph.stylesheet: String by GSPropertyDelegate<String>("ui")
+var Edge.weight: Double by GSPropertyDelegate<Double>("layout")
+
+// Do this one by hand as 'class' is a reserved word.
+var Node.styleClass: String
+    set(value) = setAttribute("ui.class", value)
+    get() = getAttribute("ui.class")
+
+fun createGraph(name: String, styles: String): SingleGraph {
+    System.setProperty("org.graphstream.ui.renderer", "org.graphstream.ui.j2dviewer.J2DGraphRenderer");
+    return SingleGraph(name).apply {
+        stylesheet = styles
+        setAttribute("ui.quality")
+        setAttribute("ui.antialias")
+        setAttribute("layout.quality", 0)
+        setAttribute("layout.force", 0.9)
+    }
+}
+
+class MyViewer(graph: Graph) : Viewer(graph, Viewer.ThreadingModel.GRAPH_IN_ANOTHER_THREAD) {
+    override fun enableAutoLayout(layoutAlgorithm: Layout) {
+        super.enableAutoLayout(layoutAlgorithm)
+
+        // Setting shortNap to 1 stops things bouncing around horribly at the start.
+        optLayout.setNaps(50, 1)
+    }
+}
+
+fun runGraph(graph: SingleGraph, nodeOnClick: (Node) -> Unit) {
+    // Use a bit of custom code here instead of calling graph.display() so we can maximize the window.
+    val viewer = MyViewer(graph)
+    val view: DefaultView = object : DefaultView(viewer, Viewer.DEFAULT_VIEW_ID, Viewer.newGraphRenderer()) {
+        override fun openInAFrame(on: Boolean) {
+            super.openInAFrame(on)
+            if (frame != null) {
+                frame.extendedState = frame.extendedState or JFrame.MAXIMIZED_BOTH
+            }
+        }
+    }
+    viewer.addView(view)
+
+    var loop: Boolean = true
+    val viewerPipe = viewer.newViewerPipe()
+    viewerPipe.addViewerListener(object : ViewerListener {
+        override fun buttonPushed(id: String?) {
+        }
+
+        override fun buttonReleased(id: String?) {
+            val node = graph.getNode<Node>(id)
+            nodeOnClick(node)
+        }
+
+        override fun viewClosed(viewName: String?) {
+            loop = false
+        }
+    })
+
+    view.openInAFrame(true)
+    // Seed determined through trial and error: it gives a reasonable layout for the Wednesday demo.
+    val springBox = SpringBox(false, Random(-103468310429824593L))
+    viewer.enableAutoLayout(springBox)
+
+    while (loop) {
+        viewerPipe.blockingPump()
+    }
+}

src/test/kotlin/core/visualiser/GraphStreamVisualiser.kt

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2015, R3 CEV. All rights reserved.
+ */
+@file:Suppress("CAST_NEVER_SUCCEEDS")
+
+package core.visualiser
+
+import contracts.Cash
+import contracts.CommercialPaper
+import core.Amount
+import core.ContractState
+import core.DOLLARS
+import core.days
+import core.testutils.*
+import java.time.Instant
+import kotlin.reflect.memberProperties
+
+
+val PAPER_1 = CommercialPaper.State(
+        issuance = MEGA_CORP.ref(123),
+        owner = MEGA_CORP_PUBKEY,
+        faceValue = 1000.DOLLARS,
+        maturityDate = TEST_TX_TIME + 7.days
+)
+
+private fun trade(redemptionTime: Instant = TEST_TX_TIME + 8.days,
+                  aliceGetsBack: Amount = 1000.DOLLARS,
+                  destroyPaperAtRedemption: Boolean = true): TransactionGroupDSL<ContractState> {
+    val someProfits = 1200.DOLLARS
+    return transactionGroupFor<CommercialPaper.State>() {
+        roots {
+            transaction(900.DOLLARS.CASH `owned by` ALICE label "alice's $900")
+            transaction(someProfits.CASH `owned by` MEGA_CORP_PUBKEY label "some profits")
+        }
+
+        // Some CP is issued onto the ledger by MegaCorp.
+        transaction("Issuance") {
+            output("paper") { PAPER_1 }
+            arg(MEGA_CORP_PUBKEY) { CommercialPaper.Commands.Issue() }
+        }
+
+        // The CP is sold to alice for her $900, $100 less than the face value. At 10% interest after only 7 days,
+        // that sounds a bit too good to be true!
+        transaction("Trade") {
+            input("paper")
+            input("alice's $900")
+            output("borrowed $900") { 900.DOLLARS.CASH `owned by` MEGA_CORP_PUBKEY }
+            output("alice's paper") { "paper".output `owned by` ALICE }
+            arg(ALICE) { Cash.Commands.Move() }
+            arg(MEGA_CORP_PUBKEY) { CommercialPaper.Commands.Move() }
+        }
+
+        // Time passes, and Alice redeem's her CP for $1000, netting a $100 profit. MegaCorp has received $1200
+        // as a single payment from somewhere and uses it to pay Alice off, keeping the remaining $200 as change.
+        transaction("Redemption", redemptionTime) {
+            input("alice's paper")
+            input("some profits")
+
+            output("Alice's profit") { aliceGetsBack.CASH `owned by` ALICE }
+            output("Change") { (someProfits - aliceGetsBack).CASH `owned by` MEGA_CORP_PUBKEY }
+            if (!destroyPaperAtRedemption)
+                output { "paper".output }
+
+            arg(MEGA_CORP_PUBKEY) { Cash.Commands.Move() }
+            arg(ALICE) { CommercialPaper.Commands.Redeem() }
+        }
+    } as TransactionGroupDSL<ContractState>
+}
+
+
+fun main(args: Array<String>) {
+    val tg = trade()
+    val graph = GraphConverter(tg).convert()
+    runGraph(graph, nodeOnClick = { node ->
+        val state: ContractState? = node.getAttribute("state")
+        if (state != null) {
+            val props: List<Pair<String, Any?>> = state.javaClass.kotlin.memberProperties.map { it.name to it.getter.call(state) }
+            StateViewer.show(props)
+        }
+    })
+}
+

src/test/kotlin/core/visualiser/GroupToGraphConversion.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2015, R3 CEV. All rights reserved.
+ */
+
+package core.visualiser
+
+import core.Command
+import core.ContractState
+import core.SecureHash
+import core.testutils.TransactionGroupDSL
+import org.graphstream.graph.Edge
+import org.graphstream.graph.Node
+import org.graphstream.graph.implementations.SingleGraph
+
+class GraphConverter(val dsl: TransactionGroupDSL<in ContractState>) {
+    companion object {
+        val css = GraphConverter::class.java.getResourceAsStream("graph.css").bufferedReader().readText()
+    }
+
+    fun convert(): SingleGraph {
+        val tg = dsl.toTransactionGroup()
+        val graph = createGraph("Transaction group", css)
+
+        // Map all the transactions, including the bogus non-verified ones (with no inputs) to graph nodes.
+        for ((txIndex, tx) in (tg.transactions + tg.nonVerifiedRoots).withIndex()) {
+            val txNode = graph.addNode<Node>("tx$txIndex")
+            if (tx !in tg.nonVerifiedRoots)
+                txNode.label = dsl.labelForTransaction(tx).let { it ?: "TX ${tx.hash.prefixChars()}" }
+            txNode.styleClass = "tx"
+
+            // Now create a vertex for each output state.
+            for (outIndex in tx.outStates.indices) {
+                val node = graph.addNode<Node>(tx.outRef<ContractState>(outIndex).ref.toString())
+                val state = tx.outStates[outIndex]
+                node.label = stateToLabel(state)
+                node.styleClass = stateToCSSClass(state) + ",state"
+                node.setAttribute("state", state)
+                val edge = graph.addEdge<Edge>("tx$txIndex-out$outIndex", txNode, node, true)
+                edge.weight = 0.7
+            }
+
+            // And a vertex for each command.
+            for ((index, cmd) in tx.commands.withIndex()) {
+                val node = graph.addNode<Node>(SecureHash.randomSHA256().prefixChars())
+                node.label = commandToTypeName(cmd.value)
+                node.styleClass = "command"
+                val edge = graph.addEdge<Edge>("tx$txIndex-cmd-$index", node, txNode)
+                edge.weight = 0.4
+            }
+        }
+        // And now all states and transactions were mapped to graph nodes, hook up the input edges.
+        for ((txIndex, tx) in tg.transactions.withIndex()) {
+            for ((inputIndex, ref) in tx.inStateRefs.withIndex()) {
+                val edge = graph.addEdge<Edge>("tx$txIndex-in$inputIndex", ref.toString(), "tx$txIndex", true)
+                edge.weight = 1.2
+            }
+        }
+        return graph
+    }
+
+    private fun stateToLabel(state: ContractState): String {
+        return dsl.labelForState(state) ?: stateToTypeName(state)
+    }
+
+    private fun commandToTypeName(state: Command) = state.javaClass.canonicalName.removePrefix("contracts.").replace('$', '.')
+    private fun stateToTypeName(state: ContractState) = state.javaClass.canonicalName.removePrefix("contracts.").removeSuffix(".State")
+    private fun stateToCSSClass(state: ContractState) = stateToTypeName(state).replace('.', '_').toLowerCase()
+}

src/test/kotlin/core/visualiser/StateViewer.form

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="core.visualiser.StateViewer">
+  <grid id="27dc6" binding="root" layout-manager="BorderLayout" hgap="15" vgap="15">
+    <constraints>
+      <xy x="20" y="20" width="500" height="400"/>
+    </constraints>
+    <properties>
+      <background color="-1"/>
+    </properties>
+    <border type="empty">
+      <size top="15" left="15" bottom="15" right="15"/>
+    </border>
+    <children>
+      <component id="c1614" class="javax.swing.JLabel">
+        <constraints border-constraint="North"/>
+        <properties>
+          <font style="1"/>
+          <text value="State viewer"/>
+        </properties>
+      </component>
+      <scrollpane id="2974d">
+        <constraints border-constraint="Center"/>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="8f1af" class="javax.swing.JTable" binding="propsTable">
+            <constraints/>
+            <properties>
+              <autoResizeMode value="3"/>
+              <showHorizontalLines value="false"/>
+            </properties>
+          </component>
+        </children>
+      </scrollpane>
+    </children>
+  </grid>
+</form>

src/test/kotlin/core/visualiser/StateViewer.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2015, R3 CEV. All rights reserved.
+ */
+
+package core.visualiser;
+
+import kotlin.*;
+
+import javax.swing.*;
+import javax.swing.table.*;
+import java.awt.*;
+import java.util.*;
+import java.util.List;
+
+public class StateViewer {
+    private JPanel root;
+    private JTable propsTable;
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("StateViewer");
+        List<Pair<String, Object>> props = new ArrayList<>();
+        props.add(new Pair<>("a", 123));
+        props.add(new Pair<>("things", "bar"));
+        frame.setContentPane(new StateViewer(props).root);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.pack();
+        frame.setVisible(true);
+        frame.setSize(800, 600);
+    }
+
+    public static void show(List<Pair<String, Object>> props) {
+        JFrame frame = new JFrame("StateViewer");
+        StateViewer viewer = new StateViewer(props);
+        frame.setContentPane(viewer.root);
+        frame.pack();
+        frame.setSize(600, 300);
+
+        viewer.propsTable.getColumnModel().getColumn(0).setMinWidth(150);
+        viewer.propsTable.getColumnModel().getColumn(0).setMaxWidth(150);
+
+        frame.setVisible(true);
+    }
+
+    public StateViewer(List<Pair<String, Object>> props) {
+        propsTable.setModel(new AbstractTableModel() {
+            @Override
+            public int getRowCount() {
+                return props.size();
+            }
+
+            @Override
+            public int getColumnCount() {
+                return 2;
+            }
+
+            @Override
+            public String getColumnName(int column) {
+                if (column == 0)
+                    return "Attribute";
+                else if (column == 1)
+                    return "Value";
+                else
+                    return "?";
+            }
+
+            @Override
+            public Object getValueAt(int rowIndex, int columnIndex) {
+                if (columnIndex == 0)
+                    return props.get(rowIndex).getFirst();
+                else
+                    return props.get(rowIndex).getSecond();
+            }
+        });
+    }
+
+    {
+// GUI initializer generated by IntelliJ IDEA GUI Designer
+// >>> IMPORTANT!! <<<
+// DO NOT EDIT OR ADD ANY CODE HERE!
+        $$$setupUI$$$();
+    }
+
+    /**
+     * Method generated by IntelliJ IDEA GUI Designer
+     * >>> IMPORTANT!! <<<
+     * DO NOT edit this method OR call it in your code!
+     *
+     * @noinspection ALL
+     */
+    private void $$$setupUI$$$() {
+        root = new JPanel();
+        root.setLayout(new BorderLayout(15, 15));
+        root.setBackground(new Color(-1));
+        root.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEmptyBorder(15, 15, 15, 15), null));
+        final JLabel label1 = new JLabel();
+        label1.setFont(new Font(label1.getFont().getName(), Font.BOLD, label1.getFont().getSize()));
+        label1.setText("State viewer");
+        root.add(label1, BorderLayout.NORTH);
+        final JScrollPane scrollPane1 = new JScrollPane();
+        root.add(scrollPane1, BorderLayout.CENTER);
+        propsTable = new JTable();
+        propsTable.setAutoResizeMode(3);
+        propsTable.setShowHorizontalLines(false);
+        scrollPane1.setViewportView(propsTable);
+    }
+
+    /**
+     * @noinspection ALL
+     */
+    public JComponent $$$getRootComponent$$$() {
+        return root;
+    }
+}

src/test/resources/core/visualiser/graph.css

@@ -0,0 +1,41 @@
+node.tx {
+    size: 10px;
+    fill-color: blue;
+    shape: rounded-box;
+    z-index: 4;
+}
+
+node.state {
+    size: 25px;
+    fill-color: beige;
+    stroke-width: 2px;
+    stroke-color: black;
+    stroke-mode: plain;
+}
+
+node {
+    text-background-mode: rounded-box;
+    text-background-color: darkslategrey;
+    text-padding: 5px;
+    text-offset: 10px;
+    text-color: white;
+    text-alignment: under;
+    text-size: 16;
+}
+
+node.command {
+    text-size: 12;
+    size: 8px;
+    fill-color: white;
+    stroke-width: 2px;
+    stroke-color: black;
+    stroke-mode: plain;
+}
+
+node.cash {
+    fill-color: red;
+}
+
+graph {
+    padding: 100px;
+}