[Pull-based Ingestion] use ConfigurationUtil for KafkaSourceConfig

CHANGELOG-3.0.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Allow to pass the list settings through environment variables (like [], ["a", "b", "c"], ...) ([#10625](https://github.com/opensearch-project/OpenSearch/pull/10625))
 - Views, simplify data access and manipulation by providing a virtual layer over one or more indices ([#11957](https://github.com/opensearch-project/OpenSearch/pull/11957))
 - Added pull-based Ingestion (APIs, for ingestion source, a Kafka plugin, and IngestionEngine that pulls data from the ingestion source) ([#16958](https://github.com/opensearch-project/OpenSearch/pull/16958))
+- Added ConfigurationUtils to core for the ease of configuration parsing [#17223](https://github.com/opensearch-project/OpenSearch/pull/17223)
 
 ### Dependencies
 - Update Apache Lucene to 10.1.0 ([#16366](https://github.com/opensearch-project/OpenSearch/pull/16366))

libs/core/src/main/java/org/opensearch/core/util/ConfigurationUtils.java

@@ -0,0 +1,186 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.core.util;
+
+import org.opensearch.OpenSearchException;
+import org.opensearch.OpenSearchParseException;
+import org.opensearch.common.annotation.PublicApi;
+
+import java.util.Map;
+
+/**
+ * Utility class for parsing configurations.
+ *
+ * @opensearch.api
+ */
+@PublicApi(since = "3.0.0")
+public final class ConfigurationUtils {
+
+    private ConfigurationUtils() {}
+
+    /**
+     * Returns and removes the specified optional property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type string a {@link OpenSearchParseException} is thrown.
+     */
+    public static String readOptionalStringProperty(Map<String, Object> configuration, String propertyName) {
+        Object value = configuration.get(propertyName);
+        return readString(propertyName, value);
+    }
+
+    /**
+     * Returns and removes the specified property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type string an {@link OpenSearchParseException} is thrown.
+     * If the property is missing an {@link OpenSearchParseException} is thrown
+     */
+    public static String readStringProperty(Map<String, Object> configuration, String propertyName) {
+        return readStringProperty(configuration, propertyName, null);
+    }
+
+    /**
+     * Returns the specified property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type string a {@link OpenSearchParseException} is thrown.
+     * If the property is missing and no default value has been specified a {@link OpenSearchParseException} is thrown
+     */
+    public static String readStringProperty(Map<String, Object> configuration, String propertyName, String defaultValue) {
+        Object value = configuration.get(propertyName);
+        if (value == null && defaultValue != null) {
+            return defaultValue;
+        } else if (value == null) {
+            throw newConfigurationException(propertyName, "required property is missing");
+        }
+        return readString(propertyName, value);
+    }
+
+    public static OpenSearchException newConfigurationException(String propertyName, String reason) {
+        String msg;
+        if (propertyName == null) {
+            msg = reason;
+        } else {
+            msg = "[" + propertyName + "] " + reason;
+        }
+        OpenSearchParseException exception = new OpenSearchParseException(msg);
+        addMetadataToException(exception, propertyName);
+        return exception;
+    }
+
+    private static String readString(String propertyName, Object value) {
+        if (value == null) {
+            return null;
+        }
+        if (value instanceof String) {
+            return (String) value;
+        }
+        throw newConfigurationException(propertyName, "property isn't a string, but of type [" + value.getClass().getName() + "]");
+    }
+
+    private static void addMetadataToException(OpenSearchException exception, String propertyName) {
+        if (propertyName != null) {
+            exception.addMetadata("opensearch.property_name", propertyName);
+        }
+    }
+
+    /**
+     * Returns the specified property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type string or int a {@link OpenSearchParseException} is thrown.
+     * If the property is missing and no default value has been specified a {@link OpenSearchParseException} is thrown
+     */
+    public static String readStringOrIntProperty(Map<String, Object> configuration, String propertyName, String defaultValue) {
+        Object value = configuration.get(propertyName);
+        if (value == null && defaultValue != null) {
+            return defaultValue;
+        } else if (value == null) {
+            throw newConfigurationException(propertyName, "required property is missing");
+        }
+        return readStringOrInt(propertyName, value);
+    }
+
+    private static String readStringOrInt(String propertyName, Object value) {
+        if (value == null) {
+            return null;
+        }
+        if (value instanceof String) {
+            return (String) value;
+        } else if (value instanceof Integer) {
+            return String.valueOf(value);
+        }
+        throw newConfigurationException(propertyName, "property isn't a string or int, but of type [" + value.getClass().getName() + "]");
+    }
+
+    /**
+     * Returns the specified property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type string or int a {@link OpenSearchParseException} is thrown.
+     */
+    public static String readOptionalStringOrIntProperty(Map<String, Object> configuration, String propertyName) {
+        Object value = configuration.get(propertyName);
+        if (value == null) {
+            return null;
+        }
+        return readStringOrInt(propertyName, value);
+    }
+
+    public static boolean readBooleanProperty(Map<String, Object> configuration, String propertyName, boolean defaultValue) {
+        Object value = configuration.get(propertyName);
+        if (value == null) {
+            return defaultValue;
+        } else {
+            return readBoolean(propertyName, value).booleanValue();
+        }
+    }
+
+    private static Boolean readBoolean(String propertyName, Object value) {
+        if (value == null) {
+            return null;
+        }
+        if (value instanceof Boolean) {
+            return (boolean) value;
+        }
+        throw newConfigurationException(propertyName, "property isn't a boolean, but of type [" + value.getClass().getName() + "]");
+    }
+
+    /**
+     * Returns the specified property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type int a {@link OpenSearchParseException} is thrown.
+     * If the property is missing an {@link OpenSearchParseException} is thrown
+     */
+    public static Integer readIntProperty(Map<String, Object> configuration, String propertyName, Integer defaultValue) {
+        Object value = configuration.get(propertyName);
+        if (value == null) {
+            return defaultValue;
+        }
+        try {
+            return Integer.parseInt(value.toString());
+        } catch (Exception e) {
+            throw newConfigurationException(propertyName, "property cannot be converted to an int [" + value + "]");
+        }
+    }
+
+    /**
+     * Returns the specified property from the specified configuration map.
+     * <p>
+     * If the property value isn't of type int a {@link OpenSearchParseException} is thrown.
+     * If the property is missing an {@link OpenSearchParseException} is thrown
+     */
+    public static Double readDoubleProperty(Map<String, Object> configuration, String propertyName) {
+        Object value = configuration.get(propertyName);
+        if (value == null) {
+            throw newConfigurationException(propertyName, "required property is missing");
+        }
+        try {
+            return Double.parseDouble(value.toString());
+        } catch (Exception e) {
+            throw newConfigurationException(propertyName, "property cannot be converted to a double [" + value + "]");
+        }
+    }
+}

libs/core/src/test/java/org/opensearch/core/util/ConfigurationUtilsTests.java

@@ -0,0 +1,136 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.core.util;
+
+import org.opensearch.OpenSearchParseException;
+import org.opensearch.test.OpenSearchTestCase;
+import org.junit.Before;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.hamcrest.Matchers.equalTo;
+
+public class ConfigurationUtilsTests extends OpenSearchTestCase {
+    private Map<String, Object> config;
+
+    @Before
+    public void setConfig() {
+        config = new HashMap<>();
+        config.put("foo", "bar");
+        config.put("boolVal", true);
+        config.put("null", null);
+        config.put("arr", Arrays.asList("1", "2", "3"));
+        config.put("ip", "127.0.0.1");
+        config.put("num", 1);
+        config.put("double", 1.0);
+    }
+
+    public void testReadStringProperty() {
+        String val = ConfigurationUtils.readStringProperty(config, "foo");
+        assertThat(val, equalTo("bar"));
+        String val1 = ConfigurationUtils.readStringProperty(config, "foo1", "none");
+        assertThat(val1, equalTo("none"));
+        try {
+            ConfigurationUtils.readStringProperty(config, "foo1", null);
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[foo1] required property is missing"));
+        }
+    }
+
+    public void testOptionalReadStringProperty() {
+        String val = ConfigurationUtils.readOptionalStringProperty(config, "foo");
+        assertThat(val, equalTo("bar"));
+        String val1 = ConfigurationUtils.readOptionalStringProperty(config, "foo1");
+        assertThat(val, equalTo("bar"));
+        assertThat(val1, equalTo(null));
+    }
+
+    public void testReadStringPropertyInvalidType() {
+        try {
+            ConfigurationUtils.readStringProperty(config, "arr");
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[arr] property isn't a string, but of type [java.util.Arrays$ArrayList]"));
+        }
+    }
+
+    public void testReadBooleanProperty() {
+        Boolean val = ConfigurationUtils.readBooleanProperty(config, "boolVal", false);
+        assertThat(val, equalTo(true));
+    }
+
+    public void testReadNullBooleanProperty() {
+        Boolean val = ConfigurationUtils.readBooleanProperty(config, "null", false);
+        assertThat(val, equalTo(false));
+    }
+
+    public void testReadBooleanPropertyInvalidType() {
+        try {
+            ConfigurationUtils.readBooleanProperty(config, "arr", true);
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[arr] property isn't a boolean, but of type [java.util.Arrays$ArrayList]"));
+        }
+    }
+
+    public void testReadStringOrIntProperty() {
+        String val1 = ConfigurationUtils.readStringOrIntProperty(config, "foo", null);
+        String val2 = ConfigurationUtils.readStringOrIntProperty(config, "num", null);
+        assertThat(val1, equalTo("bar"));
+        assertThat(val2, equalTo("1"));
+    }
+
+    public void testOptionalReadStringOrIntProperty() {
+        String val1 = ConfigurationUtils.readOptionalStringOrIntProperty(config, "foo");
+        String val2 = ConfigurationUtils.readOptionalStringOrIntProperty(config, "num");
+        String val3 = ConfigurationUtils.readOptionalStringOrIntProperty(config, "num1");
+        assertThat(val1, equalTo("bar"));
+        assertThat(val2, equalTo("1"));
+        assertThat(val3, equalTo(null));
+    }
+
+    public void testReadIntProperty() {
+        int val = ConfigurationUtils.readIntProperty(config, "num", null);
+        assertThat(val, equalTo(1));
+        try {
+            ConfigurationUtils.readIntProperty(config, "foo", 2);
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[foo] property cannot be converted to an int [bar]"));
+        }
+        try {
+            ConfigurationUtils.readIntProperty(config, "foo1", 2);
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("required property is missing"));
+        }
+    }
+
+    public void testReadDoubleProperty() {
+        double val = ConfigurationUtils.readDoubleProperty(config, "double");
+        assertThat(val, equalTo(1.0));
+        try {
+            ConfigurationUtils.readDoubleProperty(config, "foo");
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[foo] property cannot be converted to a double [bar]"));
+        }
+        try {
+            ConfigurationUtils.readDoubleProperty(config, "foo1");
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[foo1] required property is missing"));
+        }
+    }
+
+    public void testReadStringOrIntPropertyInvalidType() {
+        try {
+            ConfigurationUtils.readStringOrIntProperty(config, "arr", null);
+        } catch (OpenSearchParseException e) {
+            assertThat(e.getMessage(), equalTo("[arr] property isn't a string or int, but of type [java.util.Arrays$ArrayList]"));
+        }
+    }
+
+}

plugins/ingestion-kafka/src/main/java/org/opensearch/plugin/kafka/KafkaSourceConfig.java

@@ -8,13 +8,17 @@
 
 package org.opensearch.plugin.kafka;
 
+import org.opensearch.core.util.ConfigurationUtils;
+
 import java.util.Map;
-import java.util.Objects;
 
 /**
  * Class encapsulating the configuration of a Kafka source.
  */
 public class KafkaSourceConfig {
+    private final String PROP_TOPIC = "topic";
+    private final String PROP_BOOTSTRAP_SERVERS = "bootstrap_servers";
+
     private final String topic;
     private final String bootstrapServers;
 
@@ -23,10 +27,8 @@ public class KafkaSourceConfig {
      * @param params the configuration parameters
      */
     public KafkaSourceConfig(Map<String, Object> params) {
-        // TODO: better parsing and validation
-        this.topic = (String) Objects.requireNonNull(params.get("topic"));
-        this.bootstrapServers = (String) Objects.requireNonNull(params.get("bootstrap_servers"));
-        assert this.bootstrapServers != null;
+        this.topic = ConfigurationUtils.readStringProperty(params, PROP_TOPIC);
+        this.bootstrapServers = ConfigurationUtils.readStringProperty(params, PROP_BOOTSTRAP_SERVERS);
     }
 
     /**