WIP - Add de-serialization autoconfiguration

.gitattributes

@@ -0,0 +1 @@
+*.sh    text eol=lf

kafka-webview-plugin/pom.xml

@@ -9,7 +9,7 @@
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>kafka-webview-plugin</artifactId>
-    <version>1.0.0</version>
+    <version>1.1.0</version>
 
     <!-- Module Description and Ownership -->
     <name>Kafka WebView Plugin</name>

kafka-webview-plugin/src/main/java/org/sourcelab/kafka/webview/ui/plugin/deserializer/DeserializerDiscoveryService.java

@@ -0,0 +1,35 @@
+/**
+ * MIT License
+ *
+ * Copyright (c) 2017, 2018, 2019 SourceLab.org (https://github.com/SourceLabOrg/kafka-webview/)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.sourcelab.kafka.webview.ui.plugin.deserializer;
+
+import java.util.List;
+
+/**
+ * Discovery service for deserializer auto configuration.
+ */
+public interface DeserializerDiscoveryService {
+
+    public List<DeserializerInformation> getDeserializersInformation();
+}

kafka-webview-plugin/src/main/java/org/sourcelab/kafka/webview/ui/plugin/deserializer/DeserializerInformation.java

@@ -0,0 +1,84 @@
+/**
+ * MIT License
+ *
+ * Copyright (c) 2017, 2018, 2019 SourceLab.org (https://github.com/SourceLabOrg/kafka-webview/)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.sourcelab.kafka.webview.ui.plugin.deserializer;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * POJO deserializer information.
+ */
+public class DeserializerInformation {
+
+    private final String name;
+    private final String classpath;
+    private final Map<String, String> defaultConfig;
+
+    public DeserializerInformation(String name, Class<?> clazz) {
+        this(name, clazz.getName());
+    }
+
+    public DeserializerInformation(String name, String classpath) {
+        this(name, classpath,  new HashMap<>());
+    }
+
+    public DeserializerInformation(String name, Class<?> clazz, Map<String, String> defaultConfig) {
+        this(name, clazz.getName(), defaultConfig);
+    }
+
+    /**
+     * Constructor.
+     * 
+     * @param name Deserializer name.
+     * @param classpath Deserializer class full name, must implement org.apache.kafka.common.serialization.Deserializer.
+     * @param defaultConfig Default configuration of the deserializer.
+     */
+    public DeserializerInformation(String name, String classpath, Map<String, String> defaultConfig) {
+        this.name = name;
+        this.classpath = classpath;
+        this.defaultConfig = defaultConfig;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getClasspath() {
+        return classpath;
+    }
+
+    public Map<String, String> getDefaultConfig() {
+        return defaultConfig;
+    }
+
+    @Override
+    public String toString() {
+        return "DeserializerInformation{"
+                + "name=" + name
+                + ", classpath=" + classpath
+                + ", defaultConfig=" + defaultConfig
+                + '}';
+    }
+}

kafka-webview-ui/pom.xml

@@ -43,7 +43,7 @@
         <dependency>
             <groupId>org.sourcelab</groupId>
             <artifactId>kafka-webview-plugin</artifactId>
-            <version>1.0.0</version>
+            <version>1.1.0</version>
         </dependency>
 
         <!-- Kafka -->

kafka-webview-ui/src/assembly/distribution/start.bat

@@ -1,5 +1,10 @@
-## Define configuration
+@echo off
+
+cd /D %~dp0
+
+:: Define configuration
 set SPRING_CONFIG_LOCATION=classpath:/config/base.yml,config.yml
 
-## launch webapp
-java -jar kafka-webview-ui-*.jar
+:: launch webapp
+FOR /F "tokens=* USEBACKQ" %%F IN (`dir /b kafka-webview-ui-*.jar`) DO SET "jar=%%F"
+java -jar %jar%

kafka-webview-ui/src/assembly/distribution/start.sh

@@ -17,7 +17,4 @@ fi
 export SPRING_CONFIG_LOCATION=classpath:/config/base.yml,config.yml
 
 ## launch webapp
-java -jar kafka-webview-ui-*.jar $HEAP_OPTS $LOG_OPTS
-
-## Change back to previous directory
-cd $CWD
+exec java -jar kafka-webview-ui-*.jar $HEAP_OPTS $LOG_OPTS

kafka-webview-ui/src/main/java/org/sourcelab/kafka/webview/ui/configuration/AppProperties.java

@@ -39,6 +39,9 @@ public class AppProperties {
 
     @Value("${app.uploadPath}")
     private String uploadPath;
+
+    @Value("${app.deserializerPath}")
+    private String deserializerPath;
 
     @Value("${app.key}")
     private String appKey;
@@ -76,6 +79,10 @@ public String getUploadPath() {
         return uploadPath;
     }
 
+    public String getDeserializerPath() {
+        return deserializerPath;
+    }
+
     public String getAppKey() {
         return appKey;
     }

kafka-webview-ui/src/main/java/org/sourcelab/kafka/webview/ui/configuration/DataLoaderConfig.java

@@ -24,6 +24,15 @@
 
 package org.sourcelab.kafka.webview.ui.configuration;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.io.File;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+
 import org.apache.kafka.common.serialization.ByteArrayDeserializer;
 import org.apache.kafka.common.serialization.BytesDeserializer;
 import org.apache.kafka.common.serialization.DoubleDeserializer;
@@ -43,24 +52,43 @@
 import org.springframework.stereotype.Component;
 
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
+import java.util.ServiceLoader;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.sourcelab.kafka.webview.ui.plugin.deserializer.DeserializerDiscoveryService;
+import org.sourcelab.kafka.webview.ui.plugin.deserializer.DeserializerInformation;
+import org.sourcelab.kafka.webview.ui.model.MessageFormatType;
 
 /**
  * Called on startup to ensure we have sane default data loaded.
  */
 @Component
 public final class DataLoaderConfig implements ApplicationRunner {
 
+    private static final Logger logger = LoggerFactory.getLogger(DataLoaderConfig.class);
+
+    private final AppProperties appProperties;
     private final MessageFormatRepository messageFormatRepository;
     private final UserRepository userRepository;
+    private final ObjectMapper mapper;
 
     /**
      * Constructor.
      */
     @Autowired
-    private DataLoaderConfig(final MessageFormatRepository messageFormatRepository, final UserRepository userRepository) {
+    private DataLoaderConfig(
+        final AppProperties appProperties,
+        final MessageFormatRepository messageFormatRepository,
+        final UserRepository userRepository,
+        final ObjectMapper mapper) {
+        this.appProperties = appProperties;
         this.messageFormatRepository = messageFormatRepository;
         this.userRepository = userRepository;
+        this.mapper = mapper;
     }
 
     /**
@@ -69,6 +97,7 @@ private DataLoaderConfig(final MessageFormatRepository messageFormatRepository,
     private void createData() {
         createDefaultUser();
         createDefaultMessageFormats();
+        discoverDeserializers();
     }
 
     /**
@@ -112,11 +141,66 @@ private void createDefaultMessageFormats() {
             messageFormat.setName(entry.getKey());
             messageFormat.setClasspath(entry.getValue());
             messageFormat.setJar("n/a");
-            messageFormat.setDefaultFormat(true);
+            messageFormat.setMessageFormatType(MessageFormatType.DEFAULT);
             messageFormatRepository.save(messageFormat);
         }
     }
 
+    private void discoverDeserializers() {
+        final File deserializerPath = new File(appProperties.getDeserializerPath());
+
+        // Check preconditions
+        if (!deserializerPath.exists()) {
+            logger.warn("Directory {} doesn't exists.", deserializerPath);
+            return;
+        }
+        if (!deserializerPath.isDirectory()) {
+            logger.error("{} is not a directory.", deserializerPath);
+            return;
+        }
+
+        File[] jars = deserializerPath.listFiles((File dir, String name) -> name.endsWith(".jar"));
+        logger.info("Analyse {} for deserializer", (Object) jars);
+        for (File jar : jars) {
+            try {
+                URL jarUrl = jar.toURI().toURL();
+                ClassLoader cl = new URLClassLoader(new URL[]{jarUrl}, getClass().getClassLoader());
+                ServiceLoader<DeserializerDiscoveryService> services = ServiceLoader.load(DeserializerDiscoveryService.class, cl);
+                loadDeserializers(jar, services);
+            } catch (MalformedURLException ex) {
+                logger.error("Failed to load {}, error: {}", jar, ex.getMessage());
+            }
+        }
+    }
+
+    private void loadDeserializers(File jar, ServiceLoader<DeserializerDiscoveryService> services) {
+        for (DeserializerDiscoveryService service : services) {
+            List<DeserializerInformation> deserializersInformation = service.getDeserializersInformation();
+            for (DeserializerInformation deserializerInformation : deserializersInformation) {
+                try {
+                    MessageFormat messageFormat = messageFormatRepository.findByName(deserializerInformation.getName());
+                    if (messageFormat == null) {
+                        messageFormat = new MessageFormat();
+                    } else if (MessageFormatType.AUTOCONF != messageFormat.getMessageFormatType()) {
+                        logger.error("Try to register the formatter {} but this name is already register as a {}.",
+                            messageFormat.getName(), messageFormat.getMessageFormatType());
+                        continue;
+                    }
+                    messageFormat.setName(deserializerInformation.getName());
+                    messageFormat.setClasspath(deserializerInformation.getClasspath());
+                    messageFormat.setJar(jar.getName());
+                    messageFormat.setMessageFormatType(MessageFormatType.AUTOCONF);
+                    messageFormat.setOptionParameters(
+                        mapper.writeValueAsString(deserializerInformation.getDefaultConfig()));
+                    messageFormatRepository.save(messageFormat);
+                } catch (JsonProcessingException ex) {
+                    logger.error("Failed to load {}, because the default config are invalid ({})",
+                        deserializerInformation.getName(), ex.getMessage());
+                }
+            }
+        }
+    }
+
     /**
      * Run on startup.
      */

kafka-webview-ui/src/main/java/org/sourcelab/kafka/webview/ui/configuration/PluginConfig.java

@@ -68,6 +68,11 @@ public PluginFactory<Deserializer> getDeserializerPluginFactory(final AppPropert
         final String jarDirectory = appProperties.getUploadPath() + "/deserializers";
         return new PluginFactory<>(jarDirectory, Deserializer.class);
     }
+
+    private PluginFactory<Deserializer> getAutoconfDeserializerPluginFactory(final AppProperties appProperties) {
+        final String jarDirectory = appProperties.getDeserializerPath();
+        return new PluginFactory<>(jarDirectory, Deserializer.class);
+    }
 
     /**
      * PluginFactory for creating instances of Record Filters.
@@ -99,6 +104,7 @@ public SecretManager getSecretManager(final AppProperties appProperties) {
     public WebKafkaConsumerFactory getWebKafkaConsumerFactory(final AppProperties appProperties, final KafkaClientConfigUtil configUtil) {
         return new WebKafkaConsumerFactory(
             getDeserializerPluginFactory(appProperties),
+            getAutoconfDeserializerPluginFactory(appProperties),
             getRecordFilterPluginFactory(appProperties),
             getSecretManager(appProperties),
             getKafkaConsumerFactory(configUtil)