feat: Expose Python/Groovy version to clients (deephaven#5970)

* Sets `groovy.version` configuration property, as sourced from class
`groovy.lang.GroovyShell`.
* Sets `python.version` configuration property, as sourced from python
code `platform.python_version()`
* Adds `groovy.version` and `python.version` to
`client.configuration.list` in dh-defaults.prop (to be returned to
client as part of `ConfigService.GetConfigurationConstants` gRPC)
* Adds `io.deephaven.client.examples.PrintConfigurationConstants` to
invoke and print out results of
`ConfigService.GetConfigurationConstants`

Fixes deephaven#5938

Integrations/src/main/java/io/deephaven/integrations/python/PythonDeephavenSession.java

@@ -57,8 +57,25 @@ public class PythonDeephavenSession extends AbstractScriptSession<PythonSnapshot
     private static final String DEFAULT_SCRIPT_PATH = Configuration.getInstance()
             .getStringWithDefault("PythonDeephavenSession.defaultScriptPath", ".");
 
+    /**
+     * This is following the convention set by io.deephaven.server.config.ConfigServiceGrpcImpl / dh-defaults.prop of
+     * relaying version information to the client via Configuration properties.
+     */
+    private static final String PYTHON_VERSION_PROPERTY = "python.version";
+
     public static String SCRIPT_TYPE = "Python";
 
+    private static void setPythonVersion(Configuration configuration) {
+        final String pythonVersion;
+        try (final PyModule platformModule = PyModule.importModule("platform")) {
+            pythonVersion = platformModule.call(String.class, "python_version", new Class[0], new Object[0]);
+        } catch (RuntimeException e) {
+            log.warn(e).append("Unable to retrieve python version").endl();
+            return;
+        }
+        configuration.setProperty(PYTHON_VERSION_PROPERTY, pythonVersion);
+    }
+
     private final PythonEvaluator evaluator;
     private final PythonScope<PyObject> scope;
     private final PythonScriptSessionModule module;
@@ -67,6 +84,10 @@ public class PythonDeephavenSession extends AbstractScriptSession<PythonSnapshot
     /**
      * Create a Python ScriptSession.
      *
+     * <p>
+     * Sets the configuration property {@value PYTHON_VERSION_PROPERTY} to the value returned from the python code
+     * {@code platform.python_version()}.
+     *
      * @param updateGraph the default update graph to install for the repl
      * @param operationInitializer the default operation initializer to install for the repl
      * @param objectTypeLookup the object type lookup
@@ -96,16 +117,19 @@ public PythonDeephavenSession(
 
         registerJavaExecutor(threadInitializationFactory);
         publishInitial();
+
+        final Configuration configuration = Configuration.getInstance();
         /*
          * And now the user-defined initialization scripts, if any.
          */
         if (runInitScripts) {
-            String[] scripts = Configuration.getInstance().getProperty("PythonDeephavenSession.initScripts").split(",");
+            String[] scripts = configuration.getProperty("PythonDeephavenSession.initScripts").split(",");
 
             for (String script : scripts) {
                 runScript(script);
             }
         }
+        setPythonVersion(configuration);
     }
 
     /**

java-client/session-examples/build.gradle

@@ -49,6 +49,7 @@ application.applicationDistribution.into('bin') {
     from(createApplication('message-stream-send-receive', 'io.deephaven.client.examples.MessageStreamSendReceive'))
     from(createApplication('filter-table', 'io.deephaven.client.examples.FilterTable'))
     from(createApplication('create-shared-id', 'io.deephaven.client.examples.CreateSharedId'))
+    from(createApplication('print-configuration-constants', 'io.deephaven.client.examples.PrintConfigurationConstants'))
 
     fileMode = 0755
 }

java-client/session-examples/src/main/java/io/deephaven/client/examples/PrintConfigurationConstants.java

@@ -0,0 +1,28 @@
+//
+// Copyright (c) 2016-2024 Deephaven Data Labs and Patent Pending
+//
+package io.deephaven.client.examples;
+
+import io.deephaven.client.impl.Session;
+import io.deephaven.proto.backplane.grpc.ConfigValue;
+import picocli.CommandLine;
+import picocli.CommandLine.Command;
+
+import java.util.Map.Entry;
+
+@Command(name = "print-configuration-constants", mixinStandardHelpOptions = true,
+        description = "Print configuration constants", version = "0.1.0")
+class PrintConfigurationConstants extends SingleSessionExampleBase {
+
+    @Override
+    protected void execute(Session session) throws Exception {
+        for (Entry<String, ConfigValue> entry : session.getConfigurationConstants().get().entrySet()) {
+            System.out.println(entry.getKey() + "=" + entry.getValue().getStringValue());
+        }
+    }
+
+    public static void main(String[] args) {
+        int execute = new CommandLine(new PrintConfigurationConstants()).execute(args);
+        System.exit(execute);
+    }
+}

props/configs/src/main/resources/dh-defaults.prop

@@ -62,9 +62,9 @@ web.webgl.editable=true
 authentication.client.configuration.list=AuthHandlers
 
 # List of configuration properties to provide to authenticated clients, so they can interact with the server.
-client.configuration.list=java.version,deephaven.version,barrage.version,http.session.durationMs,file.separator,web.storage.layout.directory,web.storage.notebook.directory,web.webgl,web.webgl.editable
+client.configuration.list=java.version,deephaven.version,barrage.version,groovy.version,python.version,http.session.durationMs,file.separator,web.storage.layout.directory,web.storage.notebook.directory,web.webgl,web.webgl.editable
 
 # Version list to add to the configuration property list. Each `=`-delimited pair denotes a short name for a versioned
 # jar, and a class that is found in that jar. Any such keys will be made available to the client.configuration.list
 # as <key>.version.
-client.version.list=deephaven=io.deephaven.engine.table.Table,barrage=io.deephaven.barrage.flatbuf.BarrageMessageWrapper
+client.version.list=deephaven=io.deephaven.engine.table.Table,barrage=io.deephaven.barrage.flatbuf.BarrageMessageWrapper,groovy=groovy.lang.GroovyShell