Add ttrpc server to containerd

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

api/services/ttrpc/events/v1/doc.go

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+/*
+   Copyright The containerd Authors.
+
+   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 events defines the event pushing and subscription service.
+package events

api/services/ttrpc/events/v1/events.proto

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+syntax = "proto3";
+
+package containerd.services.events.ttrpc.v1;
+
+import weak "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
+import weak "gogoproto/gogo.proto";
+import "google/protobuf/any.proto";
+import "google/protobuf/empty.proto";
+import "google/protobuf/timestamp.proto";
+
+option go_package = "github.com/containerd/containerd/api/services/ttrpc/events/v1;events";
+
+service Events {
+	// Publish an event to a topic.
+	//
+	// The event will be packed into a timestamp envelope with the namespace
+	// introspected from the context. The envelope will then be dispatched.
+	rpc Publish(PublishRequest) returns (google.protobuf.Empty);
+
+	// Forward sends an event that has already been packaged into an envelope
+	// with a timestamp and namespace.
+	//
+	// This is useful if earlier timestamping is required or when forwarding on
+	// behalf of another component, namespace or publisher.
+	rpc Forward(ForwardRequest) returns (google.protobuf.Empty);
+
+	// Subscribe to a stream of events, possibly returning only that match any
+	// of the provided filters.
+	//
+	// Unlike many other methods in containerd, subscribers will get messages
+	// from all namespaces unless otherwise specified. If this is not desired,
+	// a filter can be provided in the format 'namespace==<namespace>' to
+	// restrict the received events.
+	rpc Subscribe(SubscribeRequest) returns (stream Envelope);
+}
+
+message PublishRequest {
+	string topic = 1;
+	google.protobuf.Any event = 2;
+}
+
+message ForwardRequest {
+	Envelope envelope = 1;
+}
+
+message SubscribeRequest {
+	repeated string filters = 1;
+}
+
+message Envelope {
+	option (containerd.plugin.fieldpath) = true;
+	google.protobuf.Timestamp timestamp = 1 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
+	string namespace = 2;
+	string topic = 3;
+	google.protobuf.Any event = 4;
+}