ONOS-6559 P4Runtime protocol library
Change-Id: I7070b69507dcf2ca47ee1c446bcc2505ca868fb1
diff --git a/protocols/p4runtime/ctl/src/main/java/org/onosproject/p4runtime/ctl/P4RuntimeClientImpl.java b/protocols/p4runtime/ctl/src/main/java/org/onosproject/p4runtime/ctl/P4RuntimeClientImpl.java
new file mode 100644
index 0000000..e6603ea
--- /dev/null
+++ b/protocols/p4runtime/ctl/src/main/java/org/onosproject/p4runtime/ctl/P4RuntimeClientImpl.java
@@ -0,0 +1,228 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.p4runtime.ctl;
+
+import com.google.common.collect.ImmutableList;
+import com.google.protobuf.ByteString;
+import com.google.protobuf.ExtensionRegistry;
+import com.google.protobuf.TextFormat;
+import io.grpc.ManagedChannel;
+import io.grpc.Status;
+import io.grpc.StatusRuntimeException;
+import io.grpc.stub.StreamObserver;
+import org.onlab.util.ImmutableByteSequence;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.pi.runtime.PiTableEntry;
+import org.onosproject.net.pi.runtime.PiTableId;
+import org.onosproject.p4runtime.api.P4RuntimeClient;
+import org.onosproject.p4runtime.api.P4RuntimeEvent;
+import org.slf4j.Logger;
+import p4.P4RuntimeGrpc;
+import p4.config.P4InfoOuterClass;
+import p4.tmp.P4Config;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Collection;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import static org.onlab.util.ImmutableByteSequence.copyFrom;
+import static org.slf4j.LoggerFactory.getLogger;
+import static p4.P4RuntimeOuterClass.*;
+import static p4.P4RuntimeOuterClass.SetForwardingPipelineConfigRequest.Action.VERIFY_AND_COMMIT;
+
+/**
+ * Implementation of a P4Runtime client.
+ */
+public class P4RuntimeClientImpl implements P4RuntimeClient {
+
+ private static final int DEADLINE_SECONDS = 15;
+
+ private final Logger log = getLogger(getClass());
+
+ private final DeviceId deviceId;
+ private final int p4DeviceId;
+ private final P4RuntimeControllerImpl controller;
+ private final P4RuntimeGrpc.P4RuntimeBlockingStub blockingStub;
+ private final P4RuntimeGrpc.P4RuntimeStub asyncStub;
+ private ExecutorService executorService;
+ private StreamObserver<StreamMessageRequest> streamRequestObserver;
+
+
+ P4RuntimeClientImpl(DeviceId deviceId, int p4DeviceId, ManagedChannel channel, P4RuntimeControllerImpl controller,
+ ExecutorService executorService) {
+ this.deviceId = deviceId;
+ this.p4DeviceId = p4DeviceId;
+ this.controller = controller;
+ this.executorService = executorService;
+ this.blockingStub = P4RuntimeGrpc.newBlockingStub(channel)
+ .withDeadlineAfter(DEADLINE_SECONDS, TimeUnit.SECONDS);
+ this.asyncStub = P4RuntimeGrpc.newStub(channel)
+ .withDeadlineAfter(DEADLINE_SECONDS, TimeUnit.SECONDS);
+ }
+
+ @Override
+ public CompletableFuture<Boolean> initStreamChannel() {
+ return CompletableFuture.supplyAsync(this::doInitStreamChannel, executorService);
+ }
+
+ private boolean doInitStreamChannel() {
+ if (this.streamRequestObserver == null) {
+ this.streamRequestObserver = this.asyncStub.streamChannel(new StreamChannelResponseObserver());
+ // To listen for packets and other events, we need to start the RPC.
+ // Here we do it by sending an empty packet out.
+ try {
+ this.streamRequestObserver.onNext(StreamMessageRequest.newBuilder()
+ .setPacket(PacketOut.getDefaultInstance())
+ .build());
+ } catch (StatusRuntimeException e) {
+ log.warn("Unable to initialize stream channel for {}: {}", deviceId, e);
+ return false;
+ }
+ }
+ return true;
+ }
+
+ @Override
+ public CompletableFuture<Boolean> setPipelineConfig(InputStream p4info, InputStream targetConfig) {
+ return CompletableFuture.supplyAsync(() -> doSetPipelineConfig(p4info, targetConfig), executorService);
+ }
+
+ private boolean doSetPipelineConfig(InputStream p4info, InputStream targetConfig) {
+
+ log.debug("Setting pipeline config for {}", deviceId);
+
+ P4InfoOuterClass.P4Info.Builder p4iInfoBuilder = P4InfoOuterClass.P4Info.newBuilder();
+
+ try {
+ TextFormat.getParser().merge(new InputStreamReader(p4info),
+ ExtensionRegistry.getEmptyRegistry(),
+ p4iInfoBuilder);
+ } catch (IOException ex) {
+ log.warn("Unable to load p4info for {}: {}", deviceId, ex.getMessage());
+ return false;
+ }
+
+ P4Config.P4DeviceConfig deviceIdConfig;
+ try {
+ deviceIdConfig = P4Config.P4DeviceConfig
+ .newBuilder()
+ .setExtras(P4Config.P4DeviceConfig.Extras.getDefaultInstance())
+ .setReassign(true)
+ .setDeviceData(ByteString.readFrom(targetConfig))
+ .build();
+ } catch (IOException ex) {
+ log.warn("Unable to load target-specific config for {}: {}", deviceId, ex.getMessage());
+ return false;
+ }
+
+ SetForwardingPipelineConfigRequest request = SetForwardingPipelineConfigRequest
+ .newBuilder()
+ .setAction(VERIFY_AND_COMMIT)
+ .addConfigs(ForwardingPipelineConfig
+ .newBuilder()
+ .setDeviceId(p4DeviceId)
+ .setP4Info(p4iInfoBuilder.build())
+ .setP4DeviceConfig(deviceIdConfig.toByteString())
+ .build())
+ .build();
+ try {
+ this.blockingStub.setForwardingPipelineConfig(request);
+ } catch (StatusRuntimeException ex) {
+ log.warn("Unable to set pipeline config for {}: {}", deviceId, ex.getMessage());
+ return false;
+ }
+
+ return true;
+ }
+
+ @Override
+ public boolean writeTableEntries(Collection<PiTableEntry> entries, WriteOperationType opType) {
+
+ throw new UnsupportedOperationException("writeTableEntries not implemented.");
+ }
+
+ @Override
+ public CompletableFuture<Collection<PiTableEntry>> dumpTable(PiTableId tableId) {
+
+ throw new UnsupportedOperationException("dumpTable not implemented.");
+ }
+
+ @Override
+ public void shutdown() {
+
+ if (this.streamRequestObserver != null) {
+ this.streamRequestObserver.onError(new StatusRuntimeException(Status.CANCELLED));
+ this.streamRequestObserver.onCompleted();
+ }
+
+ this.executorService.shutdownNow();
+ try {
+ executorService.awaitTermination(5, TimeUnit.SECONDS);
+ } catch (InterruptedException e) {
+ log.warn("Executor service didn't shutdown in time.");
+ }
+
+ // Prevent the execution of other tasks.
+ executorService = null;
+ }
+
+ private class StreamChannelResponseObserver implements StreamObserver<StreamMessageResponse> {
+
+ @Override
+ public void onNext(StreamMessageResponse message) {
+
+ P4RuntimeEvent event;
+
+ if (message.getPacket().isInitialized()) {
+ // Packet-in
+ PacketIn packetIn = message.getPacket();
+ ImmutableByteSequence data = copyFrom(packetIn.getPayload().asReadOnlyByteBuffer());
+ ImmutableList.Builder<ImmutableByteSequence> metadataBuilder = ImmutableList.builder();
+ packetIn.getMetadataList().stream()
+ .map(m -> m.getValue().asReadOnlyByteBuffer())
+ .map(ImmutableByteSequence::copyFrom)
+ .forEach(metadataBuilder::add);
+ event = new DefaultPacketInEvent(deviceId, data, metadataBuilder.build());
+
+ } else if (message.getArbitration().isInitialized()) {
+ // Arbitration.
+ throw new UnsupportedOperationException("Arbitration not implemented.");
+
+ } else {
+ log.warn("Unrecognized stream message from {}: {}", deviceId, message);
+ return;
+ }
+
+ controller.postEvent(event);
+ }
+
+ @Override
+ public void onError(Throwable throwable) {
+ log.warn("Error on stream channel for {}: {}", deviceId, throwable);
+ }
+
+ @Override
+ public void onCompleted() {
+ // TODO: declare the device as disconnected?
+ }
+ }
+
+}