Carmelo Cascone | 99c59db | 2019-01-17 15:39:35 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019-present Open Networking Foundation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.p4runtime.ctl; |
| 18 | |
| 19 | import com.google.protobuf.Message; |
| 20 | import com.google.protobuf.TextFormat; |
| 21 | import org.onosproject.net.pi.model.PiPipeconf; |
| 22 | import org.onosproject.net.pi.runtime.PiEntity; |
| 23 | import org.slf4j.Logger; |
| 24 | |
| 25 | import java.util.List; |
| 26 | import java.util.Objects; |
| 27 | import java.util.stream.Collectors; |
| 28 | |
| 29 | import static com.google.common.base.Preconditions.checkNotNull; |
| 30 | import static java.lang.String.format; |
| 31 | import static org.slf4j.LoggerFactory.getLogger; |
| 32 | |
| 33 | /** |
| 34 | * Abstract implementation of a codec that translates PI entities into P4Runtime |
| 35 | * protobuf messages and vice versa. |
| 36 | * |
| 37 | * @param <P> PI entity class |
| 38 | * @param <M> P4Runtime protobuf message class |
| 39 | */ |
| 40 | abstract class AbstractP4RuntimeCodec<P extends PiEntity, M extends Message> { |
| 41 | |
| 42 | protected final Logger log = getLogger(this.getClass()); |
| 43 | |
| 44 | protected abstract M encode(P piEntity, PiPipeconf pipeconf, |
| 45 | P4InfoBrowser browser) |
| 46 | throws CodecException, P4InfoBrowser.NotFoundException; |
| 47 | |
| 48 | protected abstract P decode(M message, PiPipeconf pipeconf, |
| 49 | P4InfoBrowser browser) |
| 50 | throws CodecException, P4InfoBrowser.NotFoundException; |
| 51 | |
| 52 | /** |
| 53 | * Returns a P4Runtime protobuf message that is equivalent to the given PI |
| 54 | * entity for the given pipeconf. |
| 55 | * |
| 56 | * @param piEntity PI entity instance |
| 57 | * @param pipeconf pipeconf |
| 58 | * @return P4Runtime protobuf message |
| 59 | * @throws CodecException if the given PI entity cannot be encoded (see |
| 60 | * exception message) |
| 61 | */ |
| 62 | public M encode(P piEntity, PiPipeconf pipeconf) |
| 63 | throws CodecException { |
| 64 | try { |
| 65 | return encode(piEntity, pipeconf, browserOrFail(pipeconf)); |
| 66 | } catch (P4InfoBrowser.NotFoundException e) { |
| 67 | throw new CodecException(e.getMessage()); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Returns a PI entity instance that is equivalent to the P4Runtime protobuf |
| 73 | * message for the given pipeconf. |
| 74 | * |
| 75 | * @param message P4Runtime protobuf message |
| 76 | * @param pipeconf pipeconf pipeconf |
| 77 | * @return PI entity instance |
| 78 | * @throws CodecException if the given protobuf message cannot be decoded |
| 79 | * (see exception message) |
| 80 | */ |
| 81 | public P decode(M message, PiPipeconf pipeconf) |
| 82 | throws CodecException { |
| 83 | try { |
| 84 | return decode(message, pipeconf, browserOrFail(pipeconf)); |
| 85 | } catch (P4InfoBrowser.NotFoundException e) { |
| 86 | throw new CodecException(e.getMessage()); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Same as {@link #encode(PiEntity, PiPipeconf)} but returns null in case of |
| 92 | * exceptions, while the error message is logged. |
| 93 | * |
| 94 | * @param piEntity PI entity instance |
| 95 | * @param pipeconf pipeconf |
| 96 | * @return P4Runtime protobuf message |
| 97 | */ |
| 98 | public M encodeOrNull(P piEntity, PiPipeconf pipeconf) { |
| 99 | try { |
| 100 | return encode(piEntity, pipeconf); |
| 101 | } catch (CodecException e) { |
| 102 | log.error("Unable to encode {}: {} [{}]", |
| 103 | piEntity.getClass().getSimpleName(), |
| 104 | e.getMessage(), piEntity.toString()); |
| 105 | return null; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Same as {@link #decode(Message, PiPipeconf)} but returns null in case of |
| 111 | * exceptions, while the error message is logged. |
| 112 | * |
| 113 | * @param message P4Runtime protobuf message |
| 114 | * @param pipeconf pipeconf pipeconf |
| 115 | * @return PI entity instance |
| 116 | */ |
| 117 | public P decodeOrNull(M message, PiPipeconf pipeconf) { |
| 118 | try { |
| 119 | return decode(message, pipeconf); |
| 120 | } catch (CodecException e) { |
| 121 | log.error("Unable to decode {}: {} [{}]", |
| 122 | message.getClass().getSimpleName(), |
| 123 | e.getMessage(), TextFormat.shortDebugString(message)); |
| 124 | return null; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Encodes the given list of PI entities, skipping those that cannot be |
| 130 | * encoded, in which case an error message is logged. For this reason, the |
| 131 | * returned list might have different size than the returned one. |
| 132 | * |
| 133 | * @param piEntities list of PI entities |
| 134 | * @param pipeconf pipeconf |
| 135 | * @return list of P4Runtime protobuf messages |
| 136 | */ |
| 137 | public List<M> encodeAll(List<P> piEntities, PiPipeconf pipeconf) { |
| 138 | checkNotNull(piEntities); |
| 139 | return piEntities.stream() |
| 140 | .map(p -> encodeOrNull(p, pipeconf)) |
| 141 | .filter(Objects::nonNull) |
| 142 | .collect(Collectors.toList()); |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Decodes the given list of P4Runtime protobuf messages, skipping those |
| 147 | * that cannot be decoded, on which case an error message is logged. For |
| 148 | * this reason, the returned list might have different size than the |
| 149 | * returned one. |
| 150 | * |
| 151 | * @param messages list of protobuf messages |
| 152 | * @param pipeconf pipeconf |
| 153 | * @return list of PI entities |
| 154 | */ |
| 155 | public List<P> decodeAll(List<M> messages, PiPipeconf pipeconf) { |
| 156 | checkNotNull(messages); |
| 157 | return messages.stream() |
| 158 | .map(m -> decodeOrNull(m, pipeconf)) |
| 159 | .filter(Objects::nonNull) |
| 160 | .collect(Collectors.toList()); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Same as {@link #encodeAll(List, PiPipeconf)} but throws an exception if |
| 165 | * one or more of the given PI entities cannot be encoded. The returned list |
| 166 | * is guaranteed to have same size and order as the given one. |
| 167 | * |
| 168 | * @param piEntities list of PI entities |
| 169 | * @param pipeconf pipeconf |
| 170 | * @return list of protobuf messages |
| 171 | * @throws CodecException if one or more of the given PI entities cannot be |
| 172 | * encoded |
| 173 | */ |
| 174 | public List<M> encodeAllOrFail(List<P> piEntities, PiPipeconf pipeconf) |
| 175 | throws CodecException { |
| 176 | final List<M> messages = encodeAll(piEntities, pipeconf); |
| 177 | if (piEntities.size() != messages.size()) { |
| 178 | throw new CodecException(format( |
| 179 | "Unable to encode %d entities of %d given " + |
| 180 | "(see previous logs for details)", |
| 181 | piEntities.size() - messages.size(), piEntities.size())); |
| 182 | } |
| 183 | return messages; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Same as {@link #decodeAll(List, PiPipeconf)} but throws an exception if |
| 188 | * one or more of the given protobuf messages cannot be decoded. The |
| 189 | * returned list is guaranteed to have same size and order as the given |
| 190 | * one. |
| 191 | * |
| 192 | * @param messages list of protobuf messages |
| 193 | * @param pipeconf pipeconf |
| 194 | * @return list of PI entities |
| 195 | * @throws CodecException if one or more of the given protobuf messages |
| 196 | * cannot be decoded |
| 197 | */ |
| 198 | public List<P> decodeAllOrFail(List<M> messages, PiPipeconf pipeconf) |
| 199 | throws CodecException { |
| 200 | final List<P> piEntities = decodeAll(messages, pipeconf); |
| 201 | if (messages.size() != piEntities.size()) { |
| 202 | throw new CodecException(format( |
| 203 | "Unable to decode %d messages of %d given " + |
| 204 | "(see previous logs for details)", |
| 205 | messages.size() - piEntities.size(), messages.size())); |
| 206 | } |
| 207 | return piEntities; |
| 208 | } |
| 209 | |
| 210 | private P4InfoBrowser browserOrFail(PiPipeconf pipeconf) throws CodecException { |
| 211 | final P4InfoBrowser browser = PipeconfHelper.getP4InfoBrowser(pipeconf); |
| 212 | if (browser == null) { |
| 213 | throw new CodecException(format( |
| 214 | "Unable to get P4InfoBrowser for pipeconf %s", pipeconf.id())); |
| 215 | } |
| 216 | return browser; |
| 217 | } |
| 218 | } |