2 * Copyright (c) 2021 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.common;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.collect.HashBasedTable;
13 import java.util.ArrayList;
14 import java.util.Comparator;
15 import java.util.List;
17 import java.util.Map.Entry;
18 import java.util.Optional;
19 import java.util.stream.Collectors;
20 import org.eclipse.jdt.annotation.NonNull;
21 import org.eclipse.jdt.annotation.Nullable;
22 import org.opendaylight.yangtools.yang.common.Revision;
23 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
24 import org.opendaylight.yangtools.yang.model.api.stmt.ModuleEffectiveStatement;
25 import org.opendaylight.yangtools.yang.model.api.stmt.RpcEffectiveStatement;
28 * RESTCONF {@code /operations} content for a {@code GET} operation as per
29 * <a href="https://datatracker.ietf.org/doc/html/rfc8040#section-3.3.2">RFC8040</a>.
31 // FIXME: when bierman02 is gone, this should be folded to nb-rfc8040, as it is a server-side thing.
32 public enum OperationsContent {
33 JSON("{ \"ietf-restconf:operations\" : { } }") {
35 String createBody(final List<Entry<String, List<String>>> rpcsByPrefix) {
36 final var sb = new StringBuilder("{\n"
37 + " \"ietf-restconf:operations\" : {\n");
38 var entryIt = rpcsByPrefix.iterator();
39 var entry = entryIt.next();
40 var nameIt = entry.getValue().iterator();
42 sb.append(" \"").append(entry.getKey()).append(':').append(nameIt.next()).append("\": [null]");
43 if (nameIt.hasNext()) {
48 if (entryIt.hasNext()) {
50 entry = entryIt.next();
51 nameIt = entry.getValue().iterator();
58 return sb.append("\n }\n}").toString();
62 String prefix(final ModuleEffectiveStatement module) {
63 return module.argument().getLocalName();
67 XML("<operations xmlns=\"urn:ietf:params:xml:ns:yang:ietf-restconf\"/>") {
69 String createBody(final List<Entry<String, List<String>>> rpcsByPrefix) {
70 // Header with namespace declarations for each module
71 final var sb = new StringBuilder("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
72 + "<operations xmlns=\"urn:ietf:params:xml:ns:yang:ietf-restconf\"");
73 for (int i = 0; i < rpcsByPrefix.size(); ++i) {
74 final var prefix = "ns" + i;
75 sb.append("\n xmlns:").append(prefix).append("=\"").append(rpcsByPrefix.get(i).getKey())
80 // Second pass: emit all leaves
81 for (int i = 0; i < rpcsByPrefix.size(); ++i) {
82 final var prefix = "ns" + i;
83 for (var localName : rpcsByPrefix.get(i).getValue()) {
84 sb.append("\n <").append(prefix).append(':').append(localName).append("/>");
88 return sb.append("\n</operations>").toString();
92 String prefix(final ModuleEffectiveStatement module) {
93 return module.localQNameModule().getNamespace().toString();
97 private final @NonNull String emptyBody;
99 OperationsContent(final String emptyBody) {
100 this.emptyBody = requireNonNull(emptyBody);
104 * Return the content for a particular {@link EffectiveModelContext}.
106 * @param context Context to use
107 * @return Content of HTTP GET operation as a String
109 public final @NonNull String bodyFor(final @Nullable EffectiveModelContext context) {
110 if (context == null) {
113 final var modules = context.getModuleStatements();
114 if (modules.isEmpty()) {
118 // Index into prefix -> revision -> module table
119 final var prefixRevModule = HashBasedTable.<String, Optional<Revision>, ModuleEffectiveStatement>create();
120 for (var module : modules.values()) {
121 prefixRevModule.put(prefix(module), module.localQNameModule().getRevision(), module);
124 // Now extract RPC names for each module with highest revision. This needed so we expose the right set of RPCs,
125 // as we always pick the latest revision to resolve prefix (or module name)
126 // TODO: Simplify this once we have yangtools-7.0.9+
127 final var moduleRpcs = new ArrayList<Entry<String, List<String>>>();
128 for (var moduleEntry : prefixRevModule.rowMap().entrySet()) {
129 final var revisions = new ArrayList<>(moduleEntry.getValue().keySet());
130 revisions.sort(Revision::compare);
131 final var selectedRevision = revisions.get(revisions.size() - 1);
133 final var rpcNames = moduleEntry.getValue().get(selectedRevision)
134 .streamEffectiveSubstatements(RpcEffectiveStatement.class)
135 .map(rpc -> rpc.argument().getLocalName())
136 .collect(Collectors.toUnmodifiableList());
137 if (!rpcNames.isEmpty()) {
138 moduleRpcs.add(Map.entry(moduleEntry.getKey(), rpcNames));
142 if (moduleRpcs.isEmpty()) {
143 // No RPCs, return empty content
147 // Ensure stability: sort by prefix
148 moduleRpcs.sort(Comparator.comparing(Entry::getKey));
150 return modules.isEmpty() ? emptyBody : createBody(moduleRpcs);
153 abstract @NonNull String createBody(List<Entry<String, List<String>>> rpcsByPrefix);
155 abstract @NonNull String prefix(ModuleEffectiveStatement module);