api/events: split event types from events service

To avoid importing all of grpc when consuming events, the types of
events have been split in to a separate package. This should allow a
reduction in memory usage in cases where a package is consuming events
but not using the gprc service directly.

Signed-off-by: Stephen J Day <stephen.day@docker.com>

api/events/task.proto

@@ -0,0 +1,75 @@
+syntax = "proto3";
+
+package containerd.events;
+
+import "gogoproto/gogo.proto";
+import "google/protobuf/timestamp.proto";
+import "github.com/containerd/containerd/api/types/mount.proto";
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
+
+option go_package = "github.com/containerd/containerd/api/events;events";
+option (containerd.plugin.fieldpath_all) = true;
+
+message TaskCreate {
+	string container_id = 1;
+	string bundle = 2;
+	repeated containerd.types.Mount rootfs = 3;
+	TaskIO io = 4 [(gogoproto.customname) = "IO"];
+	string checkpoint = 5;
+	uint32 pid = 6;
+}
+
+message TaskStart {
+	string container_id = 1;
+	uint32 pid = 2;
+}
+
+message TaskDelete {
+	string container_id = 1;
+	uint32 pid = 2;
+	uint32 exit_status = 3;
+	google.protobuf.Timestamp exited_at = 4 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
+}
+
+message TaskIO {
+	string stdin = 1;
+	string stdout = 2;
+	string stderr = 3;
+	bool terminal = 4;
+}
+
+message TaskExit {
+	string container_id = 1;
+	string id = 2;
+	uint32 pid = 3;
+	uint32 exit_status = 4;
+	google.protobuf.Timestamp exited_at = 5 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
+}
+
+message TaskOOM {
+	string container_id = 1;
+}
+
+message TaskExecAdded {
+	string container_id = 1;
+	string exec_id = 2;
+}
+
+message TaskExecStarted {
+	string container_id = 1;
+	string exec_id = 2;
+	uint32 pid = 3;
+}
+
+message TaskPaused {
+	string container_id = 1;
+}
+
+message TaskResumed {
+	string container_id = 1;
+}
+
+message TaskCheckpointed {
+	string container_id = 1;
+	string checkpoint = 2;
+}