2 * Copyright (c) 2020 PANTHEON.tech, s.r.o. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.restconf.nb.rfc8040.rests.transactions;
10 import static java.util.Objects.requireNonNull;
11 import static org.opendaylight.mdsal.common.api.LogicalDatastoreType.CONFIGURATION;
13 import com.google.common.annotations.VisibleForTesting;
14 import com.google.common.collect.ImmutableMap;
15 import com.google.common.util.concurrent.FutureCallback;
16 import com.google.common.util.concurrent.ListenableFuture;
17 import com.google.common.util.concurrent.MoreExecutors;
18 import java.util.ArrayList;
19 import java.util.HashSet;
20 import java.util.List;
21 import java.util.Optional;
23 import org.eclipse.jdt.annotation.NonNull;
24 import org.eclipse.jdt.annotation.NonNullByDefault;
25 import org.eclipse.jdt.annotation.Nullable;
26 import org.opendaylight.mdsal.common.api.CommitInfo;
27 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
28 import org.opendaylight.mdsal.dom.api.DOMActionService;
29 import org.opendaylight.mdsal.dom.api.DOMDataBroker;
30 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadWriteTransaction;
31 import org.opendaylight.mdsal.dom.api.DOMMountPointService;
32 import org.opendaylight.mdsal.dom.api.DOMRpcService;
33 import org.opendaylight.mdsal.dom.api.DOMSchemaService.YangTextSourceExtension;
34 import org.opendaylight.mdsal.dom.api.DOMTransactionChain;
35 import org.opendaylight.restconf.api.FormattableBody;
36 import org.opendaylight.restconf.api.query.FieldsParam;
37 import org.opendaylight.restconf.api.query.FieldsParam.NodeSelector;
38 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
39 import org.opendaylight.restconf.server.api.DataGetParams;
40 import org.opendaylight.restconf.server.api.DataGetResult;
41 import org.opendaylight.restconf.server.api.DatabindContext;
42 import org.opendaylight.restconf.server.api.DatabindPath.Data;
43 import org.opendaylight.restconf.server.api.ServerException;
44 import org.opendaylight.restconf.server.api.ServerRequest;
45 import org.opendaylight.restconf.server.spi.HttpGetResource;
46 import org.opendaylight.restconf.server.spi.NormalizedNodeWriter;
47 import org.opendaylight.restconf.server.spi.NormalizedNodeWriterFactory;
48 import org.opendaylight.restconf.server.spi.RpcImplementation;
49 import org.opendaylight.restconf.server.spi.YangLibraryVersionResource;
50 import org.opendaylight.yangtools.yang.common.Empty;
51 import org.opendaylight.yangtools.yang.common.ErrorTag;
52 import org.opendaylight.yangtools.yang.common.ErrorType;
53 import org.opendaylight.yangtools.yang.common.QName;
54 import org.opendaylight.yangtools.yang.common.QNameModule;
55 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
56 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
57 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext;
58 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext.PathMixin;
59 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
62 * Implementation of RESTCONF operations using {@link DOMTransactionChain} and related concepts.
64 * @see DOMTransactionChain
65 * @see DOMDataTreeReadWriteTransaction
67 public final class MdsalRestconfStrategy extends RestconfStrategy {
68 private final @NonNull HttpGetResource yangLibraryVersion;
69 private final @NonNull DOMDataBroker dataBroker;
71 public MdsalRestconfStrategy(final DatabindContext databind, final DOMDataBroker dataBroker,
72 final ImmutableMap<QName, RpcImplementation> localRpcs, final @Nullable DOMRpcService rpcService,
73 final @Nullable DOMActionService actionService, final @Nullable YangTextSourceExtension sourceProvider,
74 final @Nullable DOMMountPointService mountPointService) {
75 super(databind, localRpcs, rpcService, actionService, sourceProvider, mountPointService);
76 this.dataBroker = requireNonNull(dataBroker);
77 yangLibraryVersion = YangLibraryVersionResource.of(databind);
81 public void yangLibraryVersionGET(final ServerRequest<FormattableBody> request) {
82 yangLibraryVersion.httpGET(request);
86 RestconfTransaction prepareWriteExecution() {
87 return new MdsalRestconfTransaction(databind(), dataBroker);
91 void delete(final ServerRequest<Empty> request, final YangInstanceIdentifier path) {
92 final var tx = dataBroker.newReadWriteTransaction();
93 tx.exists(CONFIGURATION, path).addCallback(new FutureCallback<>() {
95 public void onSuccess(final Boolean result) {
97 cancelTx(new RestconfDocumentedException("Data does not exist", ErrorType.PROTOCOL,
98 ErrorTag.DATA_MISSING, path));
102 tx.delete(CONFIGURATION, path);
103 tx.commit().addCallback(new FutureCallback<CommitInfo>() {
105 public void onSuccess(final CommitInfo result) {
106 request.completeWith(Empty.value());
110 public void onFailure(final Throwable cause) {
111 request.completeWith(new RestconfDocumentedException(
112 "Transaction to delete " + path + " failed", cause));
114 }, MoreExecutors.directExecutor());
118 public void onFailure(final Throwable cause) {
119 cancelTx(new RestconfDocumentedException("Failed to access " + path, cause));
122 private void cancelTx(final RestconfDocumentedException ex) {
124 request.completeWith(ex);
126 }, MoreExecutors.directExecutor());
130 void dataGET(final ServerRequest<DataGetResult> request, final Data path, final DataGetParams params) {
131 final var depth = params.depth();
132 final var fields = params.fields();
134 final NormalizedNodeWriterFactory writerFactory;
135 if (fields != null) {
136 final List<Set<QName>> translated;
138 translated = translateFieldsParam(path.inference().modelContext(), path.schema(), fields);
139 } catch (ServerException e) {
140 request.completeWith(e);
143 writerFactory = new MdsalNormalizedNodeWriterFactory(translated, depth);
145 writerFactory = NormalizedNodeWriterFactory.of(depth);
148 final NormalizedNode data;
150 data = readData(params.content(), path.instance(), params.withDefaults());
151 } catch (ServerException e) {
152 request.completeWith(e);
156 completeDataGET(request, data, path, writerFactory, null);
160 ListenableFuture<Optional<NormalizedNode>> read(final LogicalDatastoreType store,
161 final YangInstanceIdentifier path) {
162 try (var tx = dataBroker.newReadOnlyTransaction()) {
163 return tx.read(store, path);
168 ListenableFuture<Boolean> exists(final YangInstanceIdentifier path) {
169 try (var tx = dataBroker.newReadOnlyTransaction()) {
170 return tx.exists(LogicalDatastoreType.CONFIGURATION, path);
175 * Translate a {@link FieldsParam} to a complete list of child nodes organized into levels, suitable for use with
176 * {@link NormalizedNodeWriter}.
179 * Fields parser that stores set of {@link QName}s in each level. Because of this fact, from the output it is only
180 * possible to assume on what depth the selected element is placed. Identifiers of intermediary mixin nodes are also
181 * flatten to the same level as identifiers of data nodes.<br>
182 * Example: field 'a(/b/c);d/e' ('e' is place under choice node 'x') is parsed into following levels:<br>
184 * level 0: ['a', 'd']
185 * level 1: ['b', 'x', 'e']
189 * @param modelContext EffectiveModelContext
190 * @param startNode {@link DataSchemaContext} of the API request path
191 * @param input input value of fields parameter
192 * @return {@link List} of levels; each level contains set of {@link QName}
195 public static @NonNull List<Set<QName>> translateFieldsParam(final @NonNull EffectiveModelContext modelContext,
196 final DataSchemaContext startNode, final @NonNull FieldsParam input) throws ServerException {
197 final var parsed = new ArrayList<Set<QName>>();
198 processSelectors(parsed, modelContext, startNode.dataSchemaNode().getQName().getModule(), startNode,
199 input.nodeSelectors(), 0);
203 private static void processSelectors(final List<Set<QName>> parsed, final EffectiveModelContext context,
204 final QNameModule startNamespace, final DataSchemaContext startNode, final List<NodeSelector> selectors,
205 final int index) throws ServerException {
206 final Set<QName> startLevel;
207 if (parsed.size() <= index) {
208 startLevel = new HashSet<>();
209 parsed.add(startLevel);
211 startLevel = parsed.get(index);
213 for (var selector : selectors) {
214 var node = startNode;
215 var namespace = startNamespace;
216 var level = startLevel;
217 var levelIndex = index;
219 // Note: path is guaranteed to have at least one step
220 final var it = selector.path().iterator();
222 // FIXME: The layout of this loop is rather weird, which is due to how prepareQNameLevel() operates. We
223 // need to call it only when we know there is another identifier coming, otherwise we would end
224 // up with empty levels sneaking into the mix.
226 // Dealing with that weirdness requires understanding what the expected end results are and a
227 // larger rewrite of the algorithms involved.
228 final var step = it.next();
229 final var module = step.module();
230 if (module != null) {
231 // FIXME: this is not defensive enough, as we can fail to find the module
232 namespace = context.findModules(module).iterator().next().getQNameModule();
235 // add parsed identifier to results for current level
236 node = addChildToResult(node, step.identifier().bindTo(namespace), level);
242 level = prepareQNameLevel(parsed, level);
246 final var subs = selector.subSelectors();
247 if (!subs.isEmpty()) {
248 processSelectors(parsed, context, namespace, node, subs, levelIndex + 1);
254 * Preparation of the identifiers level that is used as storage for parsed identifiers. If the current level exist
255 * at the index that doesn't equal to the last index of already parsed identifiers, a new level of identifiers
256 * is allocated and pushed to input parsed identifiers.
258 * @param parsedIdentifiers Already parsed list of identifiers grouped to multiple levels.
259 * @param currentLevel Current level of identifiers (set).
260 * @return Existing or new level of identifiers.
262 private static Set<QName> prepareQNameLevel(final List<Set<QName>> parsedIdentifiers,
263 final Set<QName> currentLevel) {
264 final var existingLevel = parsedIdentifiers.stream()
265 .filter(qNameSet -> qNameSet.equals(currentLevel))
267 if (existingLevel.isPresent()) {
268 final int index = parsedIdentifiers.indexOf(existingLevel.orElseThrow());
269 if (index == parsedIdentifiers.size() - 1) {
270 final var nextLevel = new HashSet<QName>();
271 parsedIdentifiers.add(nextLevel);
275 return parsedIdentifiers.get(index + 1);
278 final var nextLevel = new HashSet<QName>();
279 parsedIdentifiers.add(nextLevel);
284 * Add parsed child of current node to result for current level.
286 * @param currentNode current node
287 * @param childQName parsed identifier of child node
288 * @param level current nodes level
289 * @return {@link DataSchemaContextNode}
291 private static DataSchemaContext addChildToResult(final DataSchemaContext currentNode, final QName childQName,
292 final Set<QName> level) throws ServerException {
293 // resolve parent node
294 final var parentNode = resolveMixinNode(currentNode, level, currentNode.dataSchemaNode().getQName());
295 if (parentNode == null) {
296 throw new ServerException(ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE,
297 "Not-mixin node missing in %s", currentNode.getPathStep().getNodeType().getLocalName());
300 // resolve child node
301 final var childNode = resolveMixinNode(childByQName(parentNode, childQName), level, childQName);
302 if (childNode == null) {
303 throw new ServerException(ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE,
304 "Child %s node missing in %s", childQName.getLocalName(),
305 currentNode.getPathStep().getNodeType().getLocalName());
308 // add final childNode node to level nodes
309 level.add(childNode.dataSchemaNode().getQName());
313 private static @Nullable DataSchemaContext childByQName(final DataSchemaContext parent, final QName qname) {
314 return parent instanceof DataSchemaContext.Composite composite ? composite.childByQName(qname) : null;
318 * Resolve mixin node by searching for inner nodes until not mixin node or null is found.
319 * All nodes expect of not mixin node are added to current level nodes.
321 * @param node initial mixin or not-mixin node
322 * @param level current nodes level
323 * @param qualifiedName qname of initial node
324 * @return {@link DataSchemaContextNode}
326 private static @Nullable DataSchemaContext resolveMixinNode(final @Nullable DataSchemaContext node,
327 final @NonNull Set<QName> level, final @NonNull QName qualifiedName) {
328 DataSchemaContext currentNode = node;
329 while (currentNode instanceof PathMixin currentMixin) {
330 level.add(qualifiedName);
331 currentNode = currentMixin.childByQName(qualifiedName);