REST API for GET,PUT and DELETE

core/src/main/java/org/opensearch/sql/datasource/DataSourceLoaderCache.java

@@ -0,0 +1,20 @@
+package org.opensearch.sql.datasource;
+
+import org.opensearch.sql.datasource.model.DataSource;
+import org.opensearch.sql.datasource.model.DataSourceMetadata;
+
+/**
+ * Interface for DataSourceLoaderCache which provides methods for
+ * fetch, loading and invalidating DataSource cache.
+ */
+public interface DataSourceLoaderCache {
+
+  /**
+   * Returns cached datasource object or loads a new one if not present.
+   *
+   * @param dataSourceMetadata {@link DataSourceMetadata}.
+   * @return {@link DataSource}
+   */
+  DataSource getOrLoadDataSource(DataSourceMetadata dataSourceMetadata);
+
+}

core/src/main/java/org/opensearch/sql/datasource/DataSourceLoaderCacheImpl.java

@@ -0,0 +1,50 @@
+package org.opensearch.sql.datasource;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+import org.opensearch.sql.datasource.model.DataSource;
+import org.opensearch.sql.datasource.model.DataSourceMetadata;
+import org.opensearch.sql.datasource.model.DataSourceType;
+import org.opensearch.sql.storage.DataSourceFactory;
+
+/**
+ * Default implementation of DataSourceLoaderCache. This implementation
+ * utilizes Google Guava Cache {@link Cache} for caching DataSource objects
+ * against {@link DataSourceMetadata}. Expires the cache objects every 24 hrs after
+ * the last access.
+ */
+public class DataSourceLoaderCacheImpl implements DataSourceLoaderCache {
+  private final Map<DataSourceType, DataSourceFactory> dataSourceFactoryMap;
+  private final Cache<DataSourceMetadata, DataSource> dataSourceCache;
+
+  /**
+   * DataSourceLoaderCacheImpl constructor.
+   *
+   * @param dataSourceFactorySet set of {@link DataSourceFactory}.
+   */
+  public DataSourceLoaderCacheImpl(Set<DataSourceFactory> dataSourceFactorySet) {
+    this.dataSourceFactoryMap = dataSourceFactorySet.stream()
+        .collect(Collectors.toMap(DataSourceFactory::getDataSourceType, f -> f));
+    this.dataSourceCache = CacheBuilder.newBuilder()
+        .maximumSize(1000)
+        .expireAfterAccess(24, TimeUnit.HOURS)
+        .build();
+  }
+
+  @Override
+  public DataSource getOrLoadDataSource(DataSourceMetadata dataSourceMetadata) {
+    DataSource dataSource = this.dataSourceCache.getIfPresent(dataSourceMetadata);
+    if (dataSource == null) {
+      dataSource = this.dataSourceFactoryMap.get(dataSourceMetadata.getConnector())
+          .createDataSource(dataSourceMetadata);
+      this.dataSourceCache.put(dataSourceMetadata, dataSource);
+      return dataSource;
+    }
+    return dataSource;
+  }
+
+}

core/src/main/java/org/opensearch/sql/datasource/DataSourceService.java

@@ -27,9 +27,21 @@ public interface DataSourceService {
    * Returns all dataSource Metadata objects. The returned objects won't contain
    * any of the credential info.
    *
+   * @param isDefaultDataSourceRequired is used to specify
+   *      if default opensearch connector is required in the output list.
    * @return set of {@link DataSourceMetadata}.
    */
-  Set<DataSourceMetadata> getDataSourceMetadataSet();
+  Set<DataSourceMetadata> getDataSourceMetadata(boolean isDefaultDataSourceRequired);
+
+
+  /**
+   * Returns dataSourceMetadata object with specific name.
+   * The returned objects won't contain any crendetial info.
+   *
+   * @param name name of the {@link DataSource}.
+   * @return set of {@link DataSourceMetadata}.
+   */
+  DataSourceMetadata getDataSourceMetadata(String name);
 
   /**
    * Register {@link DataSource} defined by {@link DataSourceMetadata}.

core/src/main/java/org/opensearch/sql/datasource/DataSourceServiceImpl.java

@@ -9,6 +9,10 @@
 
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -17,7 +21,9 @@
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
+import javax.xml.crypto.Data;
 import org.opensearch.sql.common.utils.StringUtils;
+import org.opensearch.sql.datasource.exceptions.DataSourceNotFoundException;
 import org.opensearch.sql.datasource.model.DataSource;
 import org.opensearch.sql.datasource.model.DataSourceMetadata;
 import org.opensearch.sql.datasource.model.DataSourceType;
@@ -35,9 +41,7 @@ public class DataSourceServiceImpl implements DataSourceService {
 
   private static String DATASOURCE_NAME_REGEX = "[@*A-Za-z]+?[*a-zA-Z_\\-0-9]*";
 
-  private final ConcurrentHashMap<DataSourceMetadata, DataSource> dataSourceMap;
-
-  private final Map<DataSourceType, DataSourceFactory> dataSourceFactoryMap;
+  private final DataSourceLoaderCache dataSourceLoaderCache;
 
   private final DataSourceMetadataStorage dataSourceMetadataStorage;
 
@@ -50,57 +54,80 @@ public DataSourceServiceImpl(Set<DataSourceFactory> dataSourceFactories,
                                DataSourceMetadataStorage dataSourceMetadataStorage,
                                DataSourceUserAuthorizationHelper
                                    dataSourceUserAuthorizationHelper) {
-    dataSourceFactoryMap =
-        dataSourceFactories.stream()
-            .collect(Collectors.toMap(DataSourceFactory::getDataSourceType, f -> f));
-    dataSourceMap = new ConcurrentHashMap<>();
     this.dataSourceMetadataStorage = dataSourceMetadataStorage;
     this.dataSourceUserAuthorizationHelper = dataSourceUserAuthorizationHelper;
+    this.dataSourceLoaderCache = new DataSourceLoaderCacheImpl(dataSourceFactories);
   }
 
   @Override
-  public Set<DataSourceMetadata> getDataSourceMetadataSet() {
+  public Set<DataSourceMetadata> getDataSourceMetadata(boolean isDefaultDataSourceRequired) {
     List<DataSourceMetadata> dataSourceMetadataList
         = this.dataSourceMetadataStorage.getDataSourceMetadata();
     Set<DataSourceMetadata> dataSourceMetadataSet = new HashSet<>(dataSourceMetadataList);
-    dataSourceMetadataSet.add(DataSourceMetadata.defaultOpenSearchDataSourceMetadata());
+    if (isDefaultDataSourceRequired) {
+      dataSourceMetadataSet.add(DataSourceMetadata.defaultOpenSearchDataSourceMetadata());
+    }
+    removeAuthInfo(dataSourceMetadataSet);
     return dataSourceMetadataSet;
   }
 
+  @Override
+  public DataSourceMetadata getDataSourceMetadata(String datasourceName) {
+    Optional<DataSourceMetadata> dataSourceMetadataOptional
+        = getDataSourceMetadataFromName(datasourceName);
+    if (dataSourceMetadataOptional.isEmpty()) {
+      throw new IllegalArgumentException("DataSource with name: " + datasourceName
+          + " doesn't exist.");
+    }
+    removeAuthInfo(dataSourceMetadataOptional.get());
+    return dataSourceMetadataOptional.get();
+  }
+
 
   @Override
   public DataSource getDataSource(String dataSourceName) {
     Optional<DataSourceMetadata>
-        dataSourceMetadataOptional = getDataSourceMetadata(dataSourceName);
+        dataSourceMetadataOptional = getDataSourceMetadataFromName(dataSourceName);
     if (dataSourceMetadataOptional.isEmpty()) {
-      throw new IllegalArgumentException(
+      throw new DataSourceNotFoundException(
           String.format("DataSource with name %s doesn't exist.", dataSourceName));
     } else {
       DataSourceMetadata dataSourceMetadata = dataSourceMetadataOptional.get();
       this.dataSourceUserAuthorizationHelper
           .authorizeDataSource(dataSourceMetadata);
-      return getDataSourceFromMetadata(dataSourceMetadata);
+      return dataSourceLoaderCache.getOrLoadDataSource(dataSourceMetadata);
     }
   }
 
   @Override
   public void createDataSource(DataSourceMetadata metadata) {
     validateDataSourceMetaData(metadata);
     if (!metadata.getName().equals(DEFAULT_DATASOURCE_NAME)) {
+      this.dataSourceLoaderCache.getOrLoadDataSource(metadata);
       this.dataSourceMetadataStorage.createDataSourceMetadata(metadata);
     }
-    dataSourceMap.put(metadata,
-        dataSourceFactoryMap.get(metadata.getConnector()).createDataSource(metadata));
   }
 
   @Override
   public void updateDataSource(DataSourceMetadata dataSourceMetadata) {
-    throw new UnsupportedOperationException("will be supported in future");
+    validateDataSourceMetaData(dataSourceMetadata);
+    if (!dataSourceMetadata.getName().equals(DEFAULT_DATASOURCE_NAME)) {
+      this.dataSourceLoaderCache.getOrLoadDataSource(dataSourceMetadata);
+      this.dataSourceMetadataStorage.updateDataSourceMetadata(dataSourceMetadata);
+    } else {
+      throw new UnsupportedOperationException(
+          "Not allowed to update default datasource :" + DEFAULT_DATASOURCE_NAME);
+    }
   }
 
   @Override
   public void deleteDataSource(String dataSourceName) {
-    throw new UnsupportedOperationException("will be supported in future");
+    if (dataSourceName.equals(DEFAULT_DATASOURCE_NAME)) {
+      throw new UnsupportedOperationException(
+          "Not allowed to delete default datasource :" + DEFAULT_DATASOURCE_NAME);
+    } else {
+      this.dataSourceMetadataStorage.deleteDataSourceMetadata(dataSourceName);
+    }
   }
 
   @Override
@@ -130,27 +157,27 @@ private void validateDataSourceMetaData(DataSourceMetadata metadata) {
             + " Properties are required parameters.");
   }
 
-  private Optional<DataSourceMetadata> getDataSourceMetadata(String dataSourceName) {
+  private Optional<DataSourceMetadata> getDataSourceMetadataFromName(String dataSourceName) {
     if (dataSourceName.equals(DEFAULT_DATASOURCE_NAME)) {
       return Optional.of(DataSourceMetadata.defaultOpenSearchDataSourceMetadata());
     } else {
       return this.dataSourceMetadataStorage.getDataSourceMetadata(dataSourceName);
     }
   }
 
-  private DataSource getDataSourceFromMetadata(DataSourceMetadata dataSourceMetadata) {
-    if (!dataSourceMap.containsKey(dataSourceMetadata)) {
-      clearDataSource(dataSourceMetadata);
-      dataSourceMap.put(dataSourceMetadata,
-          dataSourceFactoryMap.get(dataSourceMetadata.getConnector())
-              .createDataSource(dataSourceMetadata));
-    }
-    return dataSourceMap.get(dataSourceMetadata);
-  }
 
-  private void clearDataSource(DataSourceMetadata dataSourceMetadata) {
-    dataSourceMap.entrySet()
-        .removeIf(entry -> entry.getKey().getName().equals(dataSourceMetadata.getName()));
+  // It is advised to avoid sending any kind credential
+  // info in api response from security point of view.
+  private void removeAuthInfo(Set<DataSourceMetadata> dataSourceMetadataSet) {
+    dataSourceMetadataSet.forEach(this::removeAuthInfo);
   }
 
+  private void removeAuthInfo(DataSourceMetadata dataSourceMetadata) {
+    HashMap<String, String> safeProperties
+        = new HashMap<>(dataSourceMetadata.getProperties());
+    safeProperties
+        .entrySet()
+        .removeIf(entry -> entry.getKey().contains("auth"));
+    dataSourceMetadata.setProperties(safeProperties);
+  }
 }

core/src/main/java/org/opensearch/sql/datasource/exceptions/DataSourceNotFoundException.java

@@ -0,0 +1,18 @@
+/*
+ *
+ *  * Copyright OpenSearch Contributors
+ *  * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+
+package org.opensearch.sql.datasource.exceptions;
+
+/**
+ * DataSourceNotFoundException.
+ */
+public class DataSourceNotFoundException extends RuntimeException {
+  public DataSourceNotFoundException(String message) {
+    super(message);
+  }
+
+}

core/src/main/java/org/opensearch/sql/planner/physical/datasource/DataSourceTableScan.java

@@ -48,7 +48,7 @@ public String explain() {
   public void open() {
     List<ExprValue> exprValues = new ArrayList<>();
     Set<DataSourceMetadata> dataSourceMetadataSet
-        = dataSourceService.getDataSourceMetadataSet();
+        = dataSourceService.getDataSourceMetadata(true);
     for (DataSourceMetadata dataSourceMetadata : dataSourceMetadataSet) {
       exprValues.add(
           new ExprTupleValue(new LinkedHashMap<>(ImmutableMap.of(

core/src/main/java/org/opensearch/sql/storage/DataSourceFactory.java

@@ -7,6 +7,7 @@
 
 package org.opensearch.sql.storage;
 
+import java.util.Map;
 import org.opensearch.sql.datasource.DataSourceService;
 import org.opensearch.sql.datasource.model.DataSource;
 import org.opensearch.sql.datasource.model.DataSourceMetadata;
@@ -28,4 +29,5 @@ public interface DataSourceFactory {
    * Create {@link DataSource}.
    */
   DataSource createDataSource(DataSourceMetadata metadata);
+
 }

core/src/test/java/org/opensearch/sql/analysis/AnalyzerTestBase.java

@@ -185,13 +185,18 @@ private class DefaultDataSourceService implements DataSourceService {
 
 
     @Override
-    public Set<DataSourceMetadata> getDataSourceMetadataSet() {
+    public Set<DataSourceMetadata> getDataSourceMetadata(boolean isDefaultDataSourceRequired) {
       return Stream.of(opensearchDataSource, prometheusDataSource)
           .map(ds -> new DataSourceMetadata(ds.getName(),
               ds.getConnectorType(),Collections.emptyList(),
               ImmutableMap.of())).collect(Collectors.toSet());
     }
 
+    @Override
+    public DataSourceMetadata getDataSourceMetadata(String name) {
+      return null;
+    }
+
     @Override
     public void createDataSource(DataSourceMetadata metadata) {
       throw new UnsupportedOperationException("unsupported operation");