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RESTHeart MongoDB - MongoDB plugin
/*-
* ========================LICENSE_START=================================
* restheart-mongodb
* %%
* Copyright (C) 2014 - 2024 SoftInstigate
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see }
*/
@SuppressWarnings("deprecation")
public class RequestDispatcherHandler extends PipelinedHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(RequestDispatcherHandler.class);
/**
*
* @return
*/
public static RequestDispatcherHandler getInstance() {
return RequestDispatcherHandlerHolder.INSTANCE;
}
private final Map> handlersMultimap;
/**
* Creates a new instance of RequestDispacherHandler
*/
private RequestDispatcherHandler() {
this(true);
}
/**
* Used for testing. By passing a false parameter then handlers
* are not initialized and you can put your own (e.g. mocks)
*
* @param initialize if false then do not initialize the handlersMultimap
*/
RequestDispatcherHandler(boolean initialize) {
super(null);
this.handlersMultimap = new HashMap<>();
if (initialize) {
defaultInit();
}
}
/**
* Handle the request, delegating to the proper PipelinedHandler
*
* @param exchange the HttpServerExchange
* @throws Exception
*/
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
var request = MongoRequest.of(exchange);
if (request.getMethod() == METHOD.OTHER || request.getType() == TYPE.INVALID) {
LOGGER.debug("This method is not allowed: returning a <{}> HTTP code", HttpStatus.SC_METHOD_NOT_ALLOWED);
MongoResponse.of(exchange).setInError(HttpStatus.SC_METHOD_NOT_ALLOWED, "method " + request.getMethod().name() + " not allowed");
next(exchange);
return;
}
final PipelinedHandler httpHandler = getPipedHttpHandler(request.getType(), request.getMethod());
if (httpHandler != null) {
before(exchange);
httpHandler.handleRequest(exchange);
after(exchange);
} else {
LOGGER.error("Can't find PipelinedHandler({}, {})", request.getType(), request.getMethod());
MongoResponse.of(exchange).setInError(HttpStatus.SC_METHOD_NOT_ALLOWED, "method " + request.getMethod().name() + " not allowed");
next(exchange);
}
}
/**
* Given a type and method, return the appropriate PipelinedHandler which
* can handle this request
*
* @param type
* @param method
* @return the PipelinedHandler
*/
public PipelinedHandler getPipedHttpHandler(TYPE type, METHOD method) {
Map methodsMap = handlersMultimap.get(type);
return methodsMap != null ? methodsMap.get(method) : null;
}
/**
* Given a type and method, put in a PipelinedHandler
*
* @param type the DB type
* @param method the HTTP method
* @param handler the PipelinedHandler
*/
public void putHandler(TYPE type, METHOD method, PipelinedHandler handler) {
Map methodsMap = handlersMultimap.get(type);
if (methodsMap == null) {
methodsMap = new HashMap<>();
handlersMultimap.put(type, methodsMap);
}
methodsMap.put(method, handler);
}
/**
* Put into handlersMultimap all the default combinations of types, methods
* and PipelinedHandler objects
*/
private void defaultInit() {
LOGGER.trace("Initialize default HTTP handlers:");
// *** ROOT handlers
putHandler(TYPE.ROOT, METHOD.GET, new GetRootHandler());
putHandler(TYPE.ROOT_SIZE, METHOD.GET,
PipelinedHandler.pipe(
new SizeRequestTransformer(true),
new GetRootHandler(),
new SizeRequestTransformer(false)));
// *** DB handlers
putHandler(TYPE.DB, METHOD.GET,
PipelinedHandler.pipe(
new GetDBHandler(),
new AggregationTransformer(false)
));
putHandler(TYPE.DB_SIZE, METHOD.GET,
PipelinedHandler.pipe(
new SizeRequestTransformer(true),
new GetDBHandler(),
new SizeRequestTransformer(false)));
putHandler(TYPE.DB_META, METHOD.GET,
PipelinedHandler.pipe(
new GetDocumentHandler(),
new AggregationTransformer(false),
new MetaRequestTransformer()));
putHandler(TYPE.DB, METHOD.PUT, new PutDBHandler());
putHandler(TYPE.DB, METHOD.DELETE, new DeleteDBHandler());
putHandler(TYPE.DB, METHOD.PATCH, new PatchDBHandler());
// *** COLLECTION handlers
putHandler(TYPE.COLLECTION, METHOD.GET,
PipelinedHandler.pipe(
new GetCollectionHandler(),
new AggregationTransformer(false)
));
putHandler(TYPE.COLLECTION_SIZE, METHOD.GET,
PipelinedHandler.pipe(
new SizeRequestTransformer(true),
new GetCollectionHandler(),
new SizeRequestTransformer(false)));
putHandler(TYPE.COLLECTION_META, METHOD.GET,
PipelinedHandler.pipe(
new GetDocumentHandler(),
new AggregationTransformer(false),
new MetaRequestTransformer()
));
putHandler(TYPE.COLLECTION, METHOD.POST,
new NormalOrBulkDispatcherHandler(
new PostCollectionHandler(),
new BulkPostCollectionHandler()));
putHandler(TYPE.COLLECTION, METHOD.PUT,
PipelinedHandler.pipe(
new AggregationTransformer(true),
new PutCollectionHandler()));
putHandler(TYPE.COLLECTION, METHOD.DELETE, new DeleteCollectionHandler());
putHandler(TYPE.COLLECTION, METHOD.PATCH,
PipelinedHandler.pipe(
new AggregationTransformer(true),
new PatchCollectionHandler()
));
// *** DOCUMENT handlers
putHandler(TYPE.DOCUMENT, METHOD.GET, new GetDocumentHandler());
putHandler(TYPE.DOCUMENT, METHOD.PUT, new PutDocumentHandler());
putHandler(TYPE.DOCUMENT, METHOD.DELETE, new DeleteDocumentHandler());
putHandler(TYPE.DOCUMENT, METHOD.PATCH, new PatchDocumentHandler());
// *** BULK_DOCUMENTS handlers, i.e. bulk operations
putHandler(TYPE.BULK_DOCUMENTS, METHOD.DELETE,
new BulkDeleteDocumentsHandler());
putHandler(TYPE.BULK_DOCUMENTS, METHOD.PATCH,
new BulkPatchDocumentsHandler());
// *** COLLECTION_INDEXES handlers
putHandler(TYPE.COLLECTION_INDEXES, METHOD.GET, new GetIndexesHandler());
// *** INDEX handlers
putHandler(TYPE.INDEX, METHOD.PUT, new PutIndexHandler());
putHandler(TYPE.INDEX, METHOD.DELETE, new DeleteIndexHandler());
// *** FILES_BUCKET and FILE handlers
putHandler(TYPE.FILES_BUCKET, METHOD.GET, new GetCollectionHandler());
putHandler(TYPE.FILES_BUCKET, METHOD.GET, new GetCollectionHandler());
putHandler(TYPE.FILES_BUCKET_SIZE, METHOD.GET,
PipelinedHandler.pipe(
new SizeRequestTransformer(true),
new GetCollectionHandler(),
new SizeRequestTransformer(false)));
putHandler(TYPE.FILES_BUCKET_META, METHOD.GET,
PipelinedHandler.pipe(
new GetDocumentHandler(),
new MetaRequestTransformer()
));
putHandler(TYPE.FILES_BUCKET, METHOD.POST, new PostBucketHandler());
putHandler(TYPE.FILE, METHOD.PUT,
PipelinedHandler.pipe(
new PutFileHandler(),
new FileMetadataHandler()
));
putHandler(TYPE.FILES_BUCKET, METHOD.PUT, new PutBucketHandler());
putHandler(TYPE.FILES_BUCKET, METHOD.PATCH, new PatchCollectionHandler());
putHandler(TYPE.FILES_BUCKET, METHOD.DELETE, new DeleteBucketHandler());
putHandler(TYPE.FILE, METHOD.GET, new GetFileHandler());
putHandler(TYPE.FILE_BINARY, METHOD.GET, new GetFileBinaryHandler());
putHandler(TYPE.FILE, METHOD.DELETE, new DeleteFileHandler());
// PUTting or PATCHing a file involves updating the metadata in the
// xxx.files bucket for an _id. Although the chunks are immutable we
// can treat the metadata like a regular document.
putHandler(TYPE.FILE, METHOD.PATCH, new FileMetadataHandler());
// *** AGGREGATION handler
putHandler(TYPE.AGGREGATION, METHOD.GET, new GetAggregationHandler());
// *** Sessions handlers
putHandler(TYPE.SESSIONS, METHOD.POST, new PostSessionHandler());
// *** Session handlers
putHandler(TYPE.SESSION, METHOD.DELETE, new DeleteSessionHandler());
// *** SCHEMA handlers
putHandler(TYPE.SCHEMA_STORE, METHOD.GET,
PipelinedHandler.pipe(
new GetCollectionHandler(),
new JsonSchemaTransformer(false)
));
putHandler(TYPE.SCHEMA_STORE_SIZE, METHOD.GET,
PipelinedHandler.pipe(
new SizeRequestTransformer(true),
new GetCollectionHandler(),
new SizeRequestTransformer(false)));
putHandler(TYPE.SCHEMA_STORE_META, METHOD.GET,
PipelinedHandler.pipe(
new GetDocumentHandler(),
new MetaRequestTransformer()
));
putHandler(TYPE.SCHEMA_STORE, METHOD.PUT,
PipelinedHandler.pipe(
new PutCollectionHandler()
));
putHandler(TYPE.SCHEMA_STORE, METHOD.PATCH, new PatchCollectionHandler());
putHandler(TYPE.SCHEMA_STORE, METHOD.POST,
PipelinedHandler.pipe(
new JsonMetaSchemaChecker(),
new JsonSchemaTransformer(true),
new PostCollectionHandler()
));
putHandler(TYPE.SCHEMA_STORE, METHOD.DELETE, new DeleteCollectionHandler());
putHandler(TYPE.SCHEMA, METHOD.GET,
PipelinedHandler.pipe(
new GetDocumentHandler(),
new JsonSchemaTransformer(false)
));
putHandler(TYPE.SCHEMA, METHOD.PUT,
PipelinedHandler.pipe(
new JsonMetaSchemaChecker(),
new JsonSchemaTransformer(true),
new PutDocumentHandler()
));
putHandler(TYPE.SCHEMA, METHOD.DELETE, new DeleteDocumentHandler());
}
/**
* Code to execute before each handleRequest
*
* @param exchange the HttpServerExchange
*/
void before(HttpServerExchange exchange) {
}
/**
* code to execute after each handleRequest
*
* @param exchange the HttpServerExchange
*/
void after(HttpServerExchange exchange) {
}
private static class RequestDispatcherHandlerHolder {
private static final RequestDispatcherHandler INSTANCE = new RequestDispatcherHandler();
private RequestDispatcherHandlerHolder() {
}
}
}
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