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;
12 import com.google.common.annotations.VisibleForTesting;
13 import com.google.common.collect.ImmutableMap;
14 import com.google.common.util.concurrent.FutureCallback;
15 import com.google.common.util.concurrent.Futures;
16 import com.google.common.util.concurrent.ListenableFuture;
17 import com.google.common.util.concurrent.MoreExecutors;
18 import com.google.common.util.concurrent.SettableFuture;
19 import java.util.ArrayList;
20 import java.util.HashSet;
21 import java.util.LinkedList;
22 import java.util.List;
23 import java.util.Optional;
25 import org.eclipse.jdt.annotation.NonNull;
26 import org.eclipse.jdt.annotation.Nullable;
27 import org.opendaylight.mdsal.common.api.CommitInfo;
28 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
29 import org.opendaylight.mdsal.common.api.ReadFailedException;
30 import org.opendaylight.mdsal.dom.api.DOMActionService;
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.netconf.dom.api.NetconfDataTreeService;
36 import org.opendaylight.restconf.api.query.ContentParam;
37 import org.opendaylight.restconf.api.query.FieldsParam;
38 import org.opendaylight.restconf.api.query.FieldsParam.NodeSelector;
39 import org.opendaylight.restconf.api.query.WithDefaultsParam;
40 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
41 import org.opendaylight.restconf.common.errors.RestconfFuture;
42 import org.opendaylight.restconf.common.errors.SettableRestconfFuture;
43 import org.opendaylight.restconf.server.api.DataGetParams;
44 import org.opendaylight.restconf.server.api.DataGetResult;
45 import org.opendaylight.restconf.server.api.DatabindContext;
46 import org.opendaylight.restconf.server.api.DatabindPath.Data;
47 import org.opendaylight.restconf.server.api.ServerRequest;
48 import org.opendaylight.restconf.server.spi.NormalizedNodeWriterFactory;
49 import org.opendaylight.yangtools.yang.common.Empty;
50 import org.opendaylight.yangtools.yang.common.ErrorTag;
51 import org.opendaylight.yangtools.yang.common.ErrorType;
52 import org.opendaylight.yangtools.yang.common.QName;
53 import org.opendaylight.yangtools.yang.common.QNameModule;
54 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
55 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
56 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
57 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
58 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
59 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext;
60 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext.PathMixin;
61 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
62 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
63 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
66 * Implementation of RESTCONF operations on top of a raw NETCONF backend.
68 * @see NetconfDataTreeService
70 public final class NetconfRestconfStrategy extends RestconfStrategy {
71 private final NetconfDataTreeService netconfService;
73 public NetconfRestconfStrategy(final DatabindContext databind, final NetconfDataTreeService netconfService,
74 final @Nullable DOMRpcService rpcService, final @Nullable DOMActionService actionService,
75 final @Nullable YangTextSourceExtension sourceProvider,
76 final @Nullable DOMMountPointService mountPointService) {
77 super(databind, ImmutableMap.of(), rpcService, actionService, sourceProvider, mountPointService);
78 this.netconfService = requireNonNull(netconfService);
82 RestconfTransaction prepareWriteExecution() {
83 return new NetconfRestconfTransaction(modelContext(), netconfService);
87 void delete(final SettableRestconfFuture<Empty> future, final ServerRequest request,
88 final YangInstanceIdentifier path) {
89 final var tx = prepareWriteExecution();
91 Futures.addCallback(tx.commit(), new FutureCallback<CommitInfo>() {
93 public void onSuccess(final CommitInfo result) {
94 future.set(Empty.value());
98 public void onFailure(final Throwable cause) {
99 future.setFailure(TransactionUtil.decodeException(cause, "DELETE", path, modelContext()));
101 }, MoreExecutors.directExecutor());
105 RestconfFuture<DataGetResult> dataGET(final ServerRequest request, final Data path, final DataGetParams params) {
106 final var fields = params.fields();
107 final List<YangInstanceIdentifier> fieldPaths;
108 if (fields != null) {
109 final List<YangInstanceIdentifier> tmp;
111 tmp = fieldsParamToPaths(path.inference().modelContext(), path.schema(), fields);
112 } catch (RestconfDocumentedException e) {
113 return RestconfFuture.failed(e);
115 fieldPaths = tmp.isEmpty() ? null : tmp;
120 final NormalizedNode node;
121 if (fieldPaths != null) {
122 node = readData(params.content(), path.instance(), params.withDefaults(), fieldPaths);
124 node = readData(params.content(), path.instance(), params.withDefaults());
126 return completeDataGET(node, path, NormalizedNodeWriterFactory.of(params.depth()), null);
130 ListenableFuture<Optional<NormalizedNode>> read(final LogicalDatastoreType store,
131 final YangInstanceIdentifier path) {
132 return switch (store) {
133 case CONFIGURATION -> netconfService.getConfig(path);
134 case OPERATIONAL -> netconfService.get(path);
138 private ListenableFuture<Optional<NormalizedNode>> read(final LogicalDatastoreType store,
139 final YangInstanceIdentifier path, final List<YangInstanceIdentifier> fields) {
140 return switch (store) {
141 case CONFIGURATION -> netconfService.getConfig(path, fields);
142 case OPERATIONAL -> netconfService.get(path, fields);
147 * Read specific type of data from data store via transaction with specified subtrees that should only be read.
148 * Close {@link DOMTransactionChain} inside of object {@link RestconfStrategy} provided as a parameter.
150 * @param content type of data to read (config, state, all)
151 * @param path the parent path to read
152 * @param withDefa value of with-defaults parameter
153 * @param fields paths to selected subtrees which should be read, relative to the parent path
154 * @return {@link NormalizedNode}
156 // FIXME: NETCONF-1155: this method should asynchronous
157 public @Nullable NormalizedNode readData(final @NonNull ContentParam content,
158 final @NonNull YangInstanceIdentifier path, final @Nullable WithDefaultsParam withDefa,
159 final @NonNull List<YangInstanceIdentifier> fields) {
160 return switch (content) {
162 // PREPARE STATE DATA NODE
163 final var stateDataNode = readDataViaTransaction(LogicalDatastoreType.OPERATIONAL, path, fields);
164 // PREPARE CONFIG DATA NODE
165 final var configDataNode = readDataViaTransaction(LogicalDatastoreType.CONFIGURATION, path, fields);
167 yield mergeConfigAndSTateDataIfNeeded(stateDataNode, withDefa == null ? configDataNode
168 : prepareDataByParamWithDef(configDataNode, path, withDefa.mode()));
171 final var read = readDataViaTransaction(LogicalDatastoreType.CONFIGURATION, path, fields);
172 yield withDefa == null ? read : prepareDataByParamWithDef(read, path, withDefa.mode());
174 case NONCONFIG -> readDataViaTransaction(LogicalDatastoreType.OPERATIONAL, path, fields);
179 * Read specific type of data {@link LogicalDatastoreType} via transaction in {@link RestconfStrategy} with
180 * specified subtrees that should only be read.
182 * @param store datastore type
183 * @param path parent path to selected fields
184 * @param fields paths to selected subtrees which should be read, relative to the parent path
185 * @return {@link NormalizedNode}
187 private @Nullable NormalizedNode readDataViaTransaction(final @NonNull LogicalDatastoreType store,
188 final @NonNull YangInstanceIdentifier path, final @NonNull List<YangInstanceIdentifier> fields) {
189 return TransactionUtil.syncAccess(read(store, path, fields), path).orElse(null);
193 ListenableFuture<Boolean> exists(final YangInstanceIdentifier path) {
194 return Futures.transform(remapException(netconfService.getConfig(path)),
195 optionalNode -> optionalNode != null && optionalNode.isPresent(),
196 MoreExecutors.directExecutor());
199 private static <T> ListenableFuture<T> remapException(final ListenableFuture<T> input) {
200 final var ret = SettableFuture.<T>create();
201 Futures.addCallback(input, new FutureCallback<>() {
203 public void onSuccess(final T result) {
208 public void onFailure(final Throwable cause) {
209 ret.setException(cause instanceof ReadFailedException ? cause
210 : new ReadFailedException("NETCONF operation failed", cause));
212 }, MoreExecutors.directExecutor());
217 * Translate a {@link FieldsParam} to a list of child node paths saved in lists, suitable for use with
218 * {@link NetconfDataTreeService}.
221 * Fields parser that stores a set of all the leaf {@link LinkedPathElement}s specified in {@link FieldsParam}.
222 * Using {@link LinkedPathElement} it is possible to create a chain of path arguments and build complete paths
223 * since this element contains identifiers of intermediary mixin nodes and also linked to its parent
224 * {@link LinkedPathElement}.
227 * Example: field 'a(b/c;d/e)' ('e' is place under choice node 'x') is parsed into following levels:
229 * - './a' +- 'a/b' - 'b/c'
235 * @param modelContext EffectiveModelContext
236 * @param startNode Root DataSchemaNode
237 * @param input input value of fields parameter
238 * @return {@link List} of {@link YangInstanceIdentifier} that are relative to the last {@link PathArgument}
239 * of provided {@code identifier}
242 static @NonNull List<YangInstanceIdentifier> fieldsParamToPaths(final @NonNull EffectiveModelContext modelContext,
243 final @NonNull DataSchemaContext startNode, final @NonNull FieldsParam input) {
244 final var parsed = new HashSet<LinkedPathElement>();
245 processSelectors(parsed, modelContext, startNode.dataSchemaNode().getQName().getModule(),
246 new LinkedPathElement(null, List.of(), startNode), input.nodeSelectors());
247 return parsed.stream().map(NetconfRestconfStrategy::buildPath).toList();
250 private static void processSelectors(final Set<LinkedPathElement> parsed, final EffectiveModelContext context,
251 final QNameModule startNamespace, final LinkedPathElement startPathElement,
252 final List<NodeSelector> selectors) {
253 for (var selector : selectors) {
254 var pathElement = startPathElement;
255 var namespace = startNamespace;
257 // Note: path is guaranteed to have at least one step
258 final var it = selector.path().iterator();
260 final var step = it.next();
261 final var module = step.module();
262 if (module != null) {
263 // FIXME: this is not defensive enough, as we can fail to find the module
264 namespace = context.findModules(module).iterator().next().getQNameModule();
267 // add parsed path element linked to its parent
268 pathElement = addChildPathElement(pathElement, step.identifier().bindTo(namespace));
269 } while (it.hasNext());
271 final var subs = selector.subSelectors();
272 if (!subs.isEmpty()) {
273 processSelectors(parsed, context, namespace, pathElement, subs);
275 parsed.add(pathElement);
280 private static LinkedPathElement addChildPathElement(final LinkedPathElement currentElement,
281 final QName childQName) {
282 final var collectedMixinNodes = new ArrayList<PathArgument>();
284 DataSchemaContext currentNode = currentElement.targetNode;
285 DataSchemaContext actualContextNode = childByQName(currentNode, childQName);
286 if (actualContextNode == null) {
287 actualContextNode = resolveMixinNode(currentNode, currentNode.getPathStep().getNodeType());
288 actualContextNode = childByQName(actualContextNode, childQName);
291 while (actualContextNode != null && actualContextNode instanceof PathMixin) {
292 final var actualDataSchemaNode = actualContextNode.dataSchemaNode();
293 if (actualDataSchemaNode instanceof ListSchemaNode listSchema && listSchema.getKeyDefinition().isEmpty()) {
294 // we need just a single node identifier from list in the path IFF it is an unkeyed list, otherwise
295 // we need both (which is the default case)
296 actualContextNode = childByQName(actualContextNode, childQName);
297 } else if (actualDataSchemaNode instanceof LeafListSchemaNode) {
298 // NodeWithValue is unusable - stop parsing
301 collectedMixinNodes.add(actualContextNode.getPathStep());
302 actualContextNode = childByQName(actualContextNode, childQName);
306 if (actualContextNode == null) {
307 throw new RestconfDocumentedException("Child " + childQName.getLocalName() + " node missing in "
308 + currentNode.getPathStep().getNodeType().getLocalName(),
309 ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE);
312 return new LinkedPathElement(currentElement, collectedMixinNodes, actualContextNode);
315 private static @Nullable DataSchemaContext childByQName(final DataSchemaContext parent, final QName qname) {
316 return parent instanceof DataSchemaContext.Composite composite ? composite.childByQName(qname) : null;
319 private static YangInstanceIdentifier buildPath(final LinkedPathElement lastPathElement) {
320 var pathElement = lastPathElement;
321 final var path = new LinkedList<PathArgument>();
323 path.addFirst(contextPathArgument(pathElement.targetNode));
324 path.addAll(0, pathElement.mixinNodesToTarget);
325 pathElement = pathElement.parentPathElement;
326 } while (pathElement.parentPathElement != null);
328 return YangInstanceIdentifier.of(path);
331 private static @NonNull PathArgument contextPathArgument(final DataSchemaContext context) {
332 final var arg = context.pathStep();
337 final var schema = context.dataSchemaNode();
338 if (schema instanceof ListSchemaNode listSchema && !listSchema.getKeyDefinition().isEmpty()) {
339 return NodeIdentifierWithPredicates.of(listSchema.getQName());
341 if (schema instanceof LeafListSchemaNode leafListSchema) {
342 return new NodeWithValue<>(leafListSchema.getQName(), Empty.value());
344 throw new UnsupportedOperationException("Unsupported schema " + schema);
347 private static DataSchemaContext resolveMixinNode(final DataSchemaContext node,
348 final @NonNull QName qualifiedName) {
349 DataSchemaContext currentNode = node;
350 while (currentNode != null && currentNode instanceof PathMixin currentMixin) {
351 currentNode = currentMixin.childByQName(qualifiedName);
357 * {@link DataSchemaContext} of data element grouped with identifiers of leading mixin nodes and previous path
359 * - identifiers of mixin nodes on the path to the target node - required for construction of full valid
361 * - {@link LinkedPathElement} of the previous non-mixin node - required to successfully create a chain
362 * of {@link PathArgument}s
364 * @param parentPathElement parent path element
365 * @param mixinNodesToTarget identifiers of mixin nodes on the path to the target node
366 * @param targetNode target non-mixin node
368 private record LinkedPathElement(
369 @Nullable LinkedPathElement parentPathElement,
370 @NonNull List<PathArgument> mixinNodesToTarget,
371 @NonNull DataSchemaContext targetNode) {
373 requireNonNull(mixinNodesToTarget);
374 requireNonNull(targetNode);