CORDA-1953 Display error when unable to open connection to Docker (#4136)

* Display error when unable to open connection to Docker

* review comments

tools/network-bootstrapper/src/main/java/net/corda/bootstrapper/GuiUtils.java

@@ -1,5 +1,7 @@
 package net.corda.bootstrapper;
 
+import javafx.application.Platform;
+import javafx.embed.swing.JFXPanel;
 import javafx.scene.control.Alert;
 import javafx.scene.control.Label;
 import javafx.scene.control.TextArea;
@@ -9,6 +11,7 @@ import javafx.stage.StageStyle;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.util.concurrent.CountDownLatch;
 
 public class GuiUtils {
 
@@ -18,31 +21,40 @@ public class GuiUtils {
         alert.setTitle("Exception");
         alert.setHeaderText(title);
         alert.setContentText(message);
-
-        StringWriter sw = new StringWriter();
-        PrintWriter pw = new PrintWriter(sw);
-        exception.printStackTrace(pw);
-        String exceptionText = sw.toString();
-
-        Label label = new Label("Details:");
-
-        TextArea textArea = new TextArea(exceptionText);
-        textArea.setEditable(false);
-        textArea.setWrapText(true);
-
-        textArea.setMaxWidth(Double.MAX_VALUE);
-        textArea.setMaxHeight(Double.MAX_VALUE);
-        GridPane.setVgrow(textArea, Priority.ALWAYS);
-        GridPane.setHgrow(textArea, Priority.ALWAYS);
-
-        GridPane expContent = new GridPane();
-        expContent.setMaxWidth(Double.MAX_VALUE);
-        expContent.add(label, 0, 0);
-        expContent.add(textArea, 0, 1);
-
-        alert.getDialogPane().setExpandableContent(expContent);
-
+        if (exception != null) {
+            StringWriter sw = new StringWriter();
+            PrintWriter pw = new PrintWriter(sw);
+            exception.printStackTrace(pw);
+            String exceptionText = sw.toString();
+            TextArea textArea = new TextArea(exceptionText);
+            textArea.setEditable(false);
+            textArea.setWrapText(true);
+            textArea.setMaxWidth(Double.MAX_VALUE);
+            textArea.setMaxHeight(Double.MAX_VALUE);
+            Label label = new Label("Details:");
+            GridPane.setVgrow(textArea, Priority.ALWAYS);
+            GridPane.setHgrow(textArea, Priority.ALWAYS);
+            GridPane expContent = new GridPane();
+            expContent.setMaxWidth(Double.MAX_VALUE);
+            expContent.add(label, 0, 0);
+            expContent.add(textArea, 0, 1);
+            alert.getDialogPane().setExpandableContent(expContent);
+        }
         alert.showAndWait();
     }
 
+    public static void showAndQuit(String title, String message, Throwable exception) {
+        CountDownLatch countDownLatch = new CountDownLatch(1);
+        new JFXPanel();
+        Platform.runLater(() -> {
+            showException(title, message, exception);
+            countDownLatch.countDown();
+            System.exit(1);
+        });
+        try {
+            countDownLatch.await();
+        } catch (InterruptedException e) {
+        }
+    }
+
 }

tools/network-bootstrapper/src/main/kotlin/net/corda/bootstrapper/Main.kt

@@ -1,4 +1,5 @@
 @file:JvmName("Main")
+
 package net.corda.bootstrapper
 
 import javafx.application.Application
@@ -7,15 +8,19 @@ import net.corda.bootstrapper.backends.Backend.BackendType.AZURE
 import net.corda.bootstrapper.cli.AzureParser
 import net.corda.bootstrapper.cli.CliParser
 import net.corda.bootstrapper.cli.CommandLineInterface
+import net.corda.bootstrapper.docker.DockerUtils
 import net.corda.bootstrapper.gui.Gui
 import net.corda.bootstrapper.serialization.SerializationEngine
 import picocli.CommandLine
+import javax.ws.rs.ProcessingException
+import kotlin.system.exitProcess
 
 val baseArgs = CliParser()
 
 fun main(args: Array<String>) {
     SerializationEngine.init()
     CommandLine(baseArgs).parse(*args)
+    testDockerConnectivity()
 
     if (baseArgs.gui) {
         Application.launch(Gui::class.java)
@@ -32,3 +37,16 @@ fun main(args: Array<String>) {
     }
     CommandLineInterface().run(argParser)
 }
+
+private fun testDockerConnectivity() {
+    try {
+        DockerUtils.createLocalDockerClient().listImagesCmd().exec()
+    } catch (se: ProcessingException) {
+        if (baseArgs.gui) {
+            GuiUtils.showAndQuit("Could not connect to Docker", "Please ensure that docker is running locally", null)
+        } else {
+            System.err.println("Could not connect to Docker, please ensure that docker is running locally")
+            exitProcess(1)
+        }
+    }
+}

tools/network-bootstrapper/src/main/kotlin/net/corda/bootstrapper/gui/Gui.kt

@@ -1,7 +1,7 @@
 package net.corda.bootstrapper.gui
 
 import javafx.stage.Stage
-import tornadofx.*
+import tornadofx.App
 
 class Gui : App(BootstrapperView::class) {
     override fun start(stage: Stage) {