Carmelo Cascone | f7aa3f9 | 2017-07-06 23:56:50 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2017-present Open Networking Laboratory |
| 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.common.collect.ImmutableList; |
| 20 | import com.google.protobuf.ByteString; |
| 21 | import com.google.protobuf.ExtensionRegistry; |
| 22 | import com.google.protobuf.TextFormat; |
| 23 | import io.grpc.ManagedChannel; |
| 24 | import io.grpc.Status; |
| 25 | import io.grpc.StatusRuntimeException; |
| 26 | import io.grpc.stub.StreamObserver; |
| 27 | import org.onlab.util.ImmutableByteSequence; |
| 28 | import org.onosproject.net.DeviceId; |
| 29 | import org.onosproject.net.pi.runtime.PiTableEntry; |
| 30 | import org.onosproject.net.pi.runtime.PiTableId; |
| 31 | import org.onosproject.p4runtime.api.P4RuntimeClient; |
| 32 | import org.onosproject.p4runtime.api.P4RuntimeEvent; |
| 33 | import org.slf4j.Logger; |
| 34 | import p4.P4RuntimeGrpc; |
| 35 | import p4.config.P4InfoOuterClass; |
| 36 | import p4.tmp.P4Config; |
| 37 | |
| 38 | import java.io.IOException; |
| 39 | import java.io.InputStream; |
| 40 | import java.io.InputStreamReader; |
| 41 | import java.util.Collection; |
| 42 | import java.util.concurrent.CompletableFuture; |
| 43 | import java.util.concurrent.ExecutorService; |
| 44 | import java.util.concurrent.TimeUnit; |
| 45 | |
| 46 | import static org.onlab.util.ImmutableByteSequence.copyFrom; |
| 47 | import static org.slf4j.LoggerFactory.getLogger; |
| 48 | import static p4.P4RuntimeOuterClass.*; |
| 49 | import static p4.P4RuntimeOuterClass.SetForwardingPipelineConfigRequest.Action.VERIFY_AND_COMMIT; |
| 50 | |
| 51 | /** |
| 52 | * Implementation of a P4Runtime client. |
| 53 | */ |
| 54 | public class P4RuntimeClientImpl implements P4RuntimeClient { |
| 55 | |
| 56 | private static final int DEADLINE_SECONDS = 15; |
| 57 | |
| 58 | private final Logger log = getLogger(getClass()); |
| 59 | |
| 60 | private final DeviceId deviceId; |
| 61 | private final int p4DeviceId; |
| 62 | private final P4RuntimeControllerImpl controller; |
| 63 | private final P4RuntimeGrpc.P4RuntimeBlockingStub blockingStub; |
| 64 | private final P4RuntimeGrpc.P4RuntimeStub asyncStub; |
| 65 | private ExecutorService executorService; |
| 66 | private StreamObserver<StreamMessageRequest> streamRequestObserver; |
| 67 | |
| 68 | |
| 69 | P4RuntimeClientImpl(DeviceId deviceId, int p4DeviceId, ManagedChannel channel, P4RuntimeControllerImpl controller, |
| 70 | ExecutorService executorService) { |
| 71 | this.deviceId = deviceId; |
| 72 | this.p4DeviceId = p4DeviceId; |
| 73 | this.controller = controller; |
| 74 | this.executorService = executorService; |
| 75 | this.blockingStub = P4RuntimeGrpc.newBlockingStub(channel) |
| 76 | .withDeadlineAfter(DEADLINE_SECONDS, TimeUnit.SECONDS); |
| 77 | this.asyncStub = P4RuntimeGrpc.newStub(channel) |
| 78 | .withDeadlineAfter(DEADLINE_SECONDS, TimeUnit.SECONDS); |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public CompletableFuture<Boolean> initStreamChannel() { |
| 83 | return CompletableFuture.supplyAsync(this::doInitStreamChannel, executorService); |
| 84 | } |
| 85 | |
| 86 | private boolean doInitStreamChannel() { |
| 87 | if (this.streamRequestObserver == null) { |
| 88 | this.streamRequestObserver = this.asyncStub.streamChannel(new StreamChannelResponseObserver()); |
| 89 | // To listen for packets and other events, we need to start the RPC. |
| 90 | // Here we do it by sending an empty packet out. |
| 91 | try { |
| 92 | this.streamRequestObserver.onNext(StreamMessageRequest.newBuilder() |
| 93 | .setPacket(PacketOut.getDefaultInstance()) |
| 94 | .build()); |
| 95 | } catch (StatusRuntimeException e) { |
| 96 | log.warn("Unable to initialize stream channel for {}: {}", deviceId, e); |
| 97 | return false; |
| 98 | } |
| 99 | } |
| 100 | return true; |
| 101 | } |
| 102 | |
| 103 | @Override |
| 104 | public CompletableFuture<Boolean> setPipelineConfig(InputStream p4info, InputStream targetConfig) { |
| 105 | return CompletableFuture.supplyAsync(() -> doSetPipelineConfig(p4info, targetConfig), executorService); |
| 106 | } |
| 107 | |
| 108 | private boolean doSetPipelineConfig(InputStream p4info, InputStream targetConfig) { |
| 109 | |
| 110 | log.debug("Setting pipeline config for {}", deviceId); |
| 111 | |
| 112 | P4InfoOuterClass.P4Info.Builder p4iInfoBuilder = P4InfoOuterClass.P4Info.newBuilder(); |
| 113 | |
| 114 | try { |
| 115 | TextFormat.getParser().merge(new InputStreamReader(p4info), |
| 116 | ExtensionRegistry.getEmptyRegistry(), |
| 117 | p4iInfoBuilder); |
| 118 | } catch (IOException ex) { |
| 119 | log.warn("Unable to load p4info for {}: {}", deviceId, ex.getMessage()); |
| 120 | return false; |
| 121 | } |
| 122 | |
| 123 | P4Config.P4DeviceConfig deviceIdConfig; |
| 124 | try { |
| 125 | deviceIdConfig = P4Config.P4DeviceConfig |
| 126 | .newBuilder() |
| 127 | .setExtras(P4Config.P4DeviceConfig.Extras.getDefaultInstance()) |
| 128 | .setReassign(true) |
| 129 | .setDeviceData(ByteString.readFrom(targetConfig)) |
| 130 | .build(); |
| 131 | } catch (IOException ex) { |
| 132 | log.warn("Unable to load target-specific config for {}: {}", deviceId, ex.getMessage()); |
| 133 | return false; |
| 134 | } |
| 135 | |
| 136 | SetForwardingPipelineConfigRequest request = SetForwardingPipelineConfigRequest |
| 137 | .newBuilder() |
| 138 | .setAction(VERIFY_AND_COMMIT) |
| 139 | .addConfigs(ForwardingPipelineConfig |
| 140 | .newBuilder() |
| 141 | .setDeviceId(p4DeviceId) |
| 142 | .setP4Info(p4iInfoBuilder.build()) |
| 143 | .setP4DeviceConfig(deviceIdConfig.toByteString()) |
| 144 | .build()) |
| 145 | .build(); |
| 146 | try { |
| 147 | this.blockingStub.setForwardingPipelineConfig(request); |
| 148 | } catch (StatusRuntimeException ex) { |
| 149 | log.warn("Unable to set pipeline config for {}: {}", deviceId, ex.getMessage()); |
| 150 | return false; |
| 151 | } |
| 152 | |
| 153 | return true; |
| 154 | } |
| 155 | |
| 156 | @Override |
| 157 | public boolean writeTableEntries(Collection<PiTableEntry> entries, WriteOperationType opType) { |
| 158 | |
| 159 | throw new UnsupportedOperationException("writeTableEntries not implemented."); |
| 160 | } |
| 161 | |
| 162 | @Override |
| 163 | public CompletableFuture<Collection<PiTableEntry>> dumpTable(PiTableId tableId) { |
| 164 | |
| 165 | throw new UnsupportedOperationException("dumpTable not implemented."); |
| 166 | } |
| 167 | |
| 168 | @Override |
| 169 | public void shutdown() { |
| 170 | |
| 171 | if (this.streamRequestObserver != null) { |
| 172 | this.streamRequestObserver.onError(new StatusRuntimeException(Status.CANCELLED)); |
| 173 | this.streamRequestObserver.onCompleted(); |
| 174 | } |
| 175 | |
| 176 | this.executorService.shutdownNow(); |
| 177 | try { |
| 178 | executorService.awaitTermination(5, TimeUnit.SECONDS); |
| 179 | } catch (InterruptedException e) { |
| 180 | log.warn("Executor service didn't shutdown in time."); |
| 181 | } |
| 182 | |
| 183 | // Prevent the execution of other tasks. |
| 184 | executorService = null; |
| 185 | } |
| 186 | |
| 187 | private class StreamChannelResponseObserver implements StreamObserver<StreamMessageResponse> { |
| 188 | |
| 189 | @Override |
| 190 | public void onNext(StreamMessageResponse message) { |
| 191 | |
| 192 | P4RuntimeEvent event; |
| 193 | |
| 194 | if (message.getPacket().isInitialized()) { |
| 195 | // Packet-in |
| 196 | PacketIn packetIn = message.getPacket(); |
| 197 | ImmutableByteSequence data = copyFrom(packetIn.getPayload().asReadOnlyByteBuffer()); |
| 198 | ImmutableList.Builder<ImmutableByteSequence> metadataBuilder = ImmutableList.builder(); |
| 199 | packetIn.getMetadataList().stream() |
| 200 | .map(m -> m.getValue().asReadOnlyByteBuffer()) |
| 201 | .map(ImmutableByteSequence::copyFrom) |
| 202 | .forEach(metadataBuilder::add); |
| 203 | event = new DefaultPacketInEvent(deviceId, data, metadataBuilder.build()); |
| 204 | |
| 205 | } else if (message.getArbitration().isInitialized()) { |
| 206 | // Arbitration. |
| 207 | throw new UnsupportedOperationException("Arbitration not implemented."); |
| 208 | |
| 209 | } else { |
| 210 | log.warn("Unrecognized stream message from {}: {}", deviceId, message); |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | controller.postEvent(event); |
| 215 | } |
| 216 | |
| 217 | @Override |
| 218 | public void onError(Throwable throwable) { |
| 219 | log.warn("Error on stream channel for {}: {}", deviceId, throwable); |
| 220 | } |
| 221 | |
| 222 | @Override |
| 223 | public void onCompleted() { |
| 224 | // TODO: declare the device as disconnected? |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | } |