events: autogenerate fieldpath filters

To ensure consistent fieldpath matching for events, we generate the
fieldpath matching using protobuf definitions. This is done through a
plugin called "fieldpath" that defines a `Field` method for each type
with the plugin enabled. Generated code handles top-level envelope
fields, as well as deferred serialization for matching any types.

In practice, this means that we can cheaply match events on `topic` and
`namespace`. If we want to match on attributes within the event, we can
use the `event` prefix to address these fields. For example, the
following will match all envelopes that have a field named
`container_id` that has the value `testing`:

```
ctr events "event.container_id==testing"
```

The above will decode the underlying event and check that particular
field. Accordingly, if only `topic` or `namespace` is used, the event
will not be decoded and only match on the envelope.

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

Protobuild.toml

@@ -1,6 +1,6 @@
 version = "unstable"
 generator = "gogoctrd"
-plugins = ["grpc"]
+plugins = ["grpc", "fieldpath"]
 
 # Control protoc include paths. Below are usually some good defaults, but feel
 # free to try it without them if it works for your project.

api/services/events/v1/container.pb.go

@@ -50,6 +50,9 @@ import fmt "fmt"
 import math "math"
 import _ "github.com/gogo/protobuf/gogoproto"
 import google_protobuf1 "github.com/gogo/protobuf/types"
+import _ "github.com/containerd/containerd/protobuf/plugin"
+
+import github_com_containerd_containerd_typeurl "github.com/containerd/containerd/typeurl"
 
 import strings "strings"
 import reflect "reflect"
@@ -114,6 +117,101 @@ func init() {
 	proto.RegisterType((*ContainerUpdate)(nil), "containerd.services.events.v1.ContainerUpdate")
 	proto.RegisterType((*ContainerDelete)(nil), "containerd.services.events.v1.ContainerDelete")
 }
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ContainerCreate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "id":
+		return string(m.ID), len(m.ID) > 0
+	case "image":
+		return string(m.Image), len(m.Image) > 0
+	case "runtime":
+		// NOTE(stevvooe): This is probably not correct in many cases.
+		// We assume that the target message also implements the Field
+		// method, which isn't likely true in a lot of cases.
+		//
+		// If you have a broken build and have found this comment,
+		// you may be closer to a solution.
+		if m.Runtime == nil {
+			return "", false
+		}
+
+		return m.Runtime.Field(fieldpath[1:])
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ContainerCreate_Runtime) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	case "options":
+		decoded, err := github_com_containerd_containerd_typeurl.UnmarshalAny(m.Options)
+		if err != nil {
+			return "", false
+		}
+
+		adaptor, ok := decoded.(interface {
+			Field([]string) (string, bool)
+		})
+		if !ok {
+			return "", false
+		}
+		return adaptor.Field(fieldpath[1:])
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ContainerUpdate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "id":
+		return string(m.ID), len(m.ID) > 0
+	case "image":
+		return string(m.Image), len(m.Image) > 0
+	case "labels":
+		// Labels fields have been special-cased by name. If this breaks,
+		// add better special casing to fieldpath plugin.
+		if len(m.Labels) == 0 {
+			return "", false
+		}
+		value, ok := m.Labels[strings.Join(fieldpath[1:], ".")]
+		return value, ok
+	case "rootfs":
+		return string(m.RootFS), len(m.RootFS) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ContainerDelete) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "id":
+		return string(m.ID), len(m.ID) > 0
+	}
+	return "", false
+}
 func (m *ContainerCreate) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -1132,31 +1230,32 @@ func init() {
 }
 
 var fileDescriptorContainer = []byte{
-	// 401 bytes of a gzipped FileDescriptorProto
+	// 429 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x52, 0x41, 0x8b, 0xd4, 0x30,
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x52, 0x4d, 0x8b, 0xd4, 0x40,
-	0x18, 0xdd, 0xb4, 0x6b, 0x07, 0xd3, 0x83, 0x12, 0x06, 0xa9, 0x05, 0xbb, 0x43, 0x4f, 0xe3, 0x25,
+	0x10, 0xdd, 0xce, 0xac, 0x19, 0xec, 0x39, 0x28, 0xcd, 0x20, 0x71, 0xc0, 0xec, 0x30, 0xa7, 0xf1,
-	0x65, 0x47, 0x10, 0x5d, 0x41, 0x70, 0x77, 0x55, 0x04, 0x05, 0x89, 0x08, 0xe2, 0x2d, 0x9d, 0x66,
+	0xd2, 0xcd, 0x8e, 0x20, 0xba, 0x82, 0xe8, 0xee, 0xaa, 0x08, 0x0a, 0xd2, 0xe2, 0x45, 0xbc, 0xf4,
-	0x6a, 0xb0, 0x4d, 0x4a, 0x9b, 0x16, 0x7a, 0xf3, 0xe7, 0xcd, 0xd1, 0xa3, 0xa7, 0x61, 0xa6, 0x3f,
+	0x4c, 0x6a, 0xb2, 0x8d, 0x49, 0x77, 0x48, 0x3a, 0x81, 0xdc, 0xfc, 0x29, 0xfe, 0x9c, 0x3d, 0x7a,
-	0xc1, 0x5f, 0x20, 0x4d, 0x5a, 0xa7, 0x08, 0x8a, 0x7a, 0x7b, 0x5f, 0xbe, 0xf7, 0xbe, 0xef, 0xbd,
+	0xf4, 0xb4, 0xec, 0xe6, 0x27, 0x88, 0x3f, 0x40, 0xd2, 0x9d, 0xec, 0x06, 0xc1, 0xcf, 0xdb, 0xab,
-	0x24, 0xf0, 0x65, 0xca, 0xd5, 0xa7, 0x3a, 0xc6, 0x6b, 0x99, 0x47, 0x6b, 0x29, 0x14, 0xe5, 0x82,
+	0xd4, 0x7b, 0x55, 0xef, 0x55, 0x1a, 0xbf, 0x88, 0xa5, 0x39, 0x29, 0xd7, 0x74, 0xa3, 0x53, 0xb6,
-	0x95, 0xc9, 0x14, 0xd2, 0x82, 0x47, 0x15, 0x2b, 0x1b, 0xbe, 0x66, 0x55, 0xc4, 0x1a, 0x26, 0x54,
+	0xd1, 0xca, 0x08, 0xa9, 0x20, 0x8f, 0x86, 0x50, 0x64, 0x92, 0x15, 0x90, 0x57, 0x72, 0x03, 0x05,
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+	0x83, 0x0a, 0x94, 0x29, 0x58, 0xb5, 0x7f, 0xc5, 0xa0, 0x59, 0xae, 0x8d, 0x26, 0x77, 0xae, 0x24,
-	0x1d, 0x37, 0xe7, 0xfe, 0x3c, 0x95, 0xa9, 0xd4, 0xcc, 0xa8, 0x47, 0x46, 0xe4, 0xdf, 0x4d, 0xa5,
+	0xb4, 0xa7, 0x53, 0x47, 0xa7, 0xd5, 0xfe, 0x6c, 0x1a, 0xeb, 0x58, 0x5b, 0x26, 0x6b, 0x91, 0x13,
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+	0xcd, 0x6e, 0xc7, 0x5a, 0xc7, 0x09, 0x30, 0x5b, 0xad, 0xcb, 0x2d, 0x13, 0xaa, 0xee, 0x5a, 0x4f,
-	0x8d, 0x23, 0xaf, 0x4a, 0x46, 0x15, 0x43, 0x77, 0xa0, 0xc5, 0x13, 0x0f, 0x2c, 0xc0, 0xf2, 0xe6,
+	0xfe, 0x68, 0xec, 0x52, 0x94, 0x25, 0x65, 0x2c, 0x15, 0xdb, 0x4a, 0x48, 0xa2, 0x4c, 0x98, 0x13,
-	0xa5, 0xd3, 0xed, 0xce, 0xac, 0x57, 0xd7, 0xc4, 0xe2, 0x09, 0x9a, 0xc3, 0x1b, 0x3c, 0xa7, 0x29,
+	0x37, 0x61, 0x71, 0x8e, 0xf0, 0x8d, 0xa3, 0x9e, 0x7e, 0x94, 0x83, 0x30, 0x40, 0x6e, 0x61, 0x4f,
-	0xf3, 0xac, 0xbe, 0x45, 0x4c, 0x81, 0xde, 0xc2, 0x59, 0x59, 0x0b, 0xc5, 0x73, 0xe6, 0xd9, 0x0b,
+	0x46, 0x01, 0x9a, 0xa3, 0xe5, 0xf5, 0x43, 0xbf, 0x39, 0xdb, 0xf3, 0x5e, 0x1e, 0x73, 0x4f, 0x46,
-	0xb0, 0x74, 0x57, 0x0f, 0xf1, 0x1f, 0x3d, 0xe2, 0x5f, 0xd6, 0x61, 0x62, 0xd4, 0x64, 0x1c, 0xe3,
+	0x64, 0x8a, 0xaf, 0xc9, 0x54, 0xc4, 0x10, 0x78, 0x6d, 0x8b, 0xbb, 0x82, 0xbc, 0xc1, 0xe3, 0xbc,
-	0xbf, 0x81, 0xb3, 0xe1, 0x0c, 0x21, 0x78, 0x2a, 0x68, 0xce, 0x8c, 0x19, 0xa2, 0x31, 0xc2, 0x70,
+	0x54, 0x46, 0xa6, 0x10, 0x8c, 0xe6, 0x68, 0x39, 0x59, 0xdd, 0xa7, 0xbf, 0x4d, 0x49, 0x7f, 0x5a,
-	0x26, 0x0b, 0xc5, 0xa5, 0xa8, 0xb4, 0x11, 0x77, 0x35, 0xc7, 0x26, 0x1f, 0x1e, 0xf3, 0xe1, 0x67,
+	0x47, 0xb9, 0x53, 0xf3, 0x7e, 0xcc, 0xec, 0x35, 0x1e, 0x77, 0xdf, 0x08, 0xc1, 0xbb, 0x4a, 0xa4,
-	0xa2, 0x25, 0x23, 0x29, 0xfc, 0x3e, 0x8d, 0xf8, 0xbe, 0x48, 0xfe, 0x3d, 0x22, 0x81, 0x4e, 0x46,
+	0xe0, 0xcc, 0x70, 0x8b, 0x09, 0xc5, 0x63, 0x9d, 0x19, 0xa9, 0x55, 0x61, 0x8d, 0x4c, 0x56, 0x53,
-	0x63, 0x96, 0x55, 0x9e, 0xbd, 0xb0, 0x97, 0xee, 0xea, 0xe2, 0x6f, 0x13, 0x9a, 0x6d, 0xf8, 0xb5,
+	0xea, 0x2e, 0x44, 0xfb, 0xb0, 0xf4, 0xa9, 0xaa, 0x79, 0x4f, 0x5a, 0x7c, 0x1b, 0x46, 0x7c, 0x97,
-	0x16, 0x3f, 0x17, 0xaa, 0x6c, 0xc9, 0x30, 0x09, 0x85, 0xd0, 0x29, 0xa5, 0x54, 0x9b, 0xca, 0x3b,
+	0x45, 0xff, 0x1e, 0x91, 0x63, 0x3f, 0x11, 0x6b, 0x48, 0x8a, 0x60, 0x34, 0x1f, 0x2d, 0x27, 0xab,
-	0xd5, 0x2e, 0x60, 0xb7, 0x3b, 0x73, 0x88, 0x94, 0xea, 0xc5, 0x3b, 0x32, 0x74, 0xfc, 0xc7, 0xd0,
+	0x83, 0xbf, 0x4d, 0xe8, 0xb6, 0xd1, 0x57, 0x56, 0xfc, 0x4c, 0x99, 0xbc, 0xe6, 0xdd, 0x24, 0xb2,
-	0x9d, 0x48, 0xd1, 0x6d, 0x68, 0x7f, 0x66, 0xed, 0x70, 0x17, 0x3d, 0xec, 0xed, 0x36, 0x34, 0xab,
+	0xc0, 0x7e, 0xae, 0xb5, 0xd9, 0x16, 0xc1, 0xae, 0x75, 0x81, 0x9b, 0xb3, 0x3d, 0x9f, 0x6b, 0x6d,
-	0x7f, 0xda, 0xd5, 0xc5, 0x85, 0xf5, 0x08, 0x84, 0xf7, 0x27, 0x99, 0xaf, 0x59, 0xc6, 0x7e, 0x9f,
+	0x9e, 0xbf, 0xe5, 0x5d, 0x67, 0xf6, 0x10, 0x4f, 0x06, 0x52, 0x72, 0x13, 0x8f, 0x3e, 0x42, 0xdd,
-	0xf9, 0xf2, 0xc3, 0xf6, 0x10, 0x9c, 0x7c, 0x3b, 0x04, 0x27, 0x5f, 0xba, 0x00, 0x6c, 0xbb, 0x00,
+	0xdd, 0xa2, 0x85, 0xad, 0xdd, 0x4a, 0x24, 0xe5, 0xa5, 0x5d, 0x5b, 0x1c, 0x78, 0x0f, 0xd0, 0xe2,
-	0x7c, 0xed, 0x02, 0xb0, 0xef, 0x02, 0xf0, 0xf1, 0xe9, 0x7f, 0xfe, 0xda, 0x27, 0x06, 0xc5, 0x8e,
+	0xee, 0x20, 0xf3, 0x31, 0x24, 0xf0, 0xeb, 0xcc, 0x87, 0x1f, 0x4e, 0x2f, 0xc2, 0x9d, 0xaf, 0x17,
-	0x7e, 0x90, 0x07, 0x3f, 0x02, 0x00, 0x00, 0xff, 0xff, 0x68, 0xeb, 0xf5, 0x3f, 0xfe, 0x02, 0x00,
+	0xe1, 0xce, 0xa7, 0x26, 0x44, 0xa7, 0x4d, 0x88, 0xbe, 0x34, 0x21, 0x3a, 0x6f, 0x42, 0xf4, 0xf9,
-	0x00,
+	0x7b, 0x88, 0xde, 0x3f, 0xfe, 0xcf, 0xb7, 0xff, 0xc8, 0xa1, 0xb5, 0x6f, 0x7f, 0xca, 0xbd, 0x1f,
+	0x01, 0x00, 0x00, 0xff, 0xff, 0x8e, 0xae, 0x41, 0x3c, 0x44, 0x03, 0x00, 0x00,
 }

api/services/events/v1/container.proto

@@ -4,8 +4,10 @@ package containerd.services.events.v1;
 
 import "gogoproto/gogo.proto";
 import "google/protobuf/any.proto";
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
 
 option go_package = "github.com/containerd/containerd/api/services/events/v1;events";
+option (containerd.plugin.fieldpath_all) = true;
 
 message ContainerCreate {
 	string id = 1;

api/services/events/v1/content.pb.go

@@ -8,6 +8,7 @@ import proto "github.com/gogo/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import _ "github.com/gogo/protobuf/gogoproto"
+import _ "github.com/containerd/containerd/protobuf/plugin"
 
 import github_com_opencontainers_go_digest "github.com/opencontainers/go-digest"
 
@@ -32,6 +33,20 @@ func (*ContentDelete) Descriptor() ([]byte, []int) { return fileDescriptorConten
 func init() {
 	proto.RegisterType((*ContentDelete)(nil), "containerd.services.events.v1.ContentDelete")
 }
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ContentDelete) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "digest":
+		return string(m.Digest), len(m.Digest) > 0
+	}
+	return "", false
+}
 func (m *ContentDelete) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -313,19 +328,21 @@ func init() {
 }
 
 var fileDescriptorContent = []byte{
-	// 210 bytes of a gzipped FileDescriptorProto
+	// 242 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x72, 0x4d, 0xcf, 0x2c, 0xc9,
 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0x4f, 0xce, 0xcf, 0x2b, 0x49, 0xcc, 0xcc, 0x4b, 0x2d,
 	0x4a, 0x41, 0x66, 0x26, 0x16, 0x64, 0xea, 0x17, 0xa7, 0x16, 0x95, 0x65, 0x26, 0xa7, 0x16, 0xeb,
 	0xa7, 0x96, 0xa5, 0xe6, 0x95, 0x14, 0xeb, 0x97, 0x19, 0x82, 0x55, 0xa4, 0xe6, 0x95, 0xe8, 0x15,
 	0x14, 0xe5, 0x97, 0xe4, 0x0b, 0xc9, 0x22, 0x34, 0xe8, 0xc1, 0x14, 0xeb, 0x41, 0x14, 0xeb, 0x95,
-	0x19, 0x4a, 0x89, 0xa4, 0xe7, 0xa7, 0xe7, 0x83, 0x55, 0xea, 0x83, 0x58, 0x10, 0x4d, 0x4a, 0xd1,
+	0x19, 0x4a, 0x89, 0xa4, 0xe7, 0xa7, 0xe7, 0x83, 0x55, 0xea, 0x83, 0x58, 0x10, 0x4d, 0x52, 0x0e,
-	0x5c, 0xbc, 0xce, 0x10, 0x53, 0x5c, 0x52, 0x73, 0x52, 0x4b, 0x52, 0x85, 0xbc, 0xb8, 0xd8, 0x52,
+	0x04, 0xed, 0x06, 0xab, 0x4b, 0x2a, 0x4d, 0xd3, 0x2f, 0xc8, 0x29, 0x4d, 0xcf, 0xcc, 0xd3, 0x4f,
-	0x32, 0xd3, 0x53, 0x8b, 0x4b, 0x24, 0x18, 0x15, 0x18, 0x35, 0x38, 0x9d, 0x8c, 0x4e, 0xdc, 0x93,
+	0xcb, 0x4c, 0xcd, 0x49, 0x29, 0x48, 0x2c, 0xc9, 0x80, 0x98, 0xa0, 0x14, 0xcd, 0xc5, 0xeb, 0x0c,
-	0x67, 0xb8, 0x75, 0x4f, 0x5e, 0x0b, 0xc9, 0x91, 0xf9, 0x05, 0xa9, 0x79, 0x70, 0xcb, 0x8a, 0xf5,
+	0x71, 0x87, 0x4b, 0x6a, 0x4e, 0x6a, 0x49, 0xaa, 0x90, 0x17, 0x17, 0x5b, 0x4a, 0x66, 0x7a, 0x6a,
-	0xd3, 0xf3, 0x75, 0x21, 0x5a, 0xf4, 0x5c, 0xc0, 0x54, 0x10, 0xd4, 0x04, 0xa7, 0x88, 0x13, 0x0f,
+	0x71, 0x89, 0x04, 0xa3, 0x02, 0xa3, 0x06, 0xa7, 0x93, 0xd1, 0x89, 0x7b, 0xf2, 0x0c, 0xb7, 0xee,
-	0xe5, 0x18, 0x6e, 0x3c, 0x94, 0x63, 0x68, 0x78, 0x24, 0xc7, 0x78, 0xe2, 0x91, 0x1c, 0xe3, 0x85,
+	0xc9, 0x6b, 0x21, 0x59, 0x95, 0x5f, 0x90, 0x9a, 0x07, 0xb7, 0xa3, 0x58, 0x3f, 0x3d, 0x5f, 0x17,
-	0x47, 0x72, 0x8c, 0x0f, 0x1e, 0xc9, 0x31, 0x46, 0xd9, 0x91, 0xe9, 0x65, 0x6b, 0x08, 0x2b, 0x89,
+	0xa2, 0x45, 0xcf, 0x05, 0x4c, 0x05, 0x41, 0x4d, 0x70, 0x8a, 0x39, 0xf1, 0x50, 0x8e, 0xe1, 0xc6,
-	0x0d, 0xec, 0x7a, 0x63, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0x6a, 0x41, 0x46, 0x06, 0x3b, 0x01,
+	0x43, 0x39, 0x86, 0x86, 0x47, 0x72, 0x8c, 0x27, 0x1e, 0xc9, 0x31, 0x5e, 0x78, 0x24, 0xc7, 0xf8,
+	0xe0, 0x91, 0x1c, 0xe3, 0x82, 0x2f, 0x72, 0x8c, 0x51, 0x76, 0x64, 0x06, 0x9c, 0x35, 0x84, 0x95,
+	0xc4, 0x06, 0xf6, 0x81, 0x31, 0x20, 0x00, 0x00, 0xff, 0xff, 0x51, 0xce, 0xec, 0x89, 0x81, 0x01,
 	0x00, 0x00,
 }

api/services/events/v1/content.proto

@@ -3,8 +3,10 @@ syntax = "proto3";
 package containerd.services.events.v1;
 
 import "gogoproto/gogo.proto";
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
 
 option go_package = "github.com/containerd/containerd/api/services/events/v1;events";
+option (containerd.plugin.fieldpath_all) = true;
 
 message ContentDelete {
 	string digest = 1 [(gogoproto.customtype) = "github.com/opencontainers/go-digest.Digest", (gogoproto.nullable) = false];

api/services/events/v1/events.pb.go

@@ -7,6 +7,7 @@ package events
 import proto "github.com/gogo/protobuf/proto"
 import fmt "fmt"
 import math "math"
+import _ "github.com/containerd/containerd/protobuf/plugin"
 import _ "github.com/gogo/protobuf/gogoproto"
 import google_protobuf1 "github.com/gogo/protobuf/types"
 import google_protobuf2 "github.com/golang/protobuf/ptypes/empty"
@@ -14,6 +15,8 @@ import _ "github.com/gogo/protobuf/types"
 
 import time "time"
 
+import github_com_containerd_containerd_typeurl "github.com/containerd/containerd/typeurl"
+
 import (
 	context "golang.org/x/net/context"
 	grpc "google.golang.org/grpc"
@@ -75,6 +78,36 @@ func init() {
 	proto.RegisterType((*Envelope)(nil), "containerd.services.events.v1.Envelope")
 }
 
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *Envelope) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	// unhandled: timestamp
+	case "namespace":
+		return string(m.Namespace), len(m.Namespace) > 0
+	case "topic":
+		return string(m.Topic), len(m.Topic) > 0
+	case "event":
+		decoded, err := github_com_containerd_containerd_typeurl.UnmarshalAny(m.Event)
+		if err != nil {
+			return "", false
+		}
+
+		adaptor, ok := decoded.(interface {
+			Field([]string) (string, bool)
+		})
+		if !ok {
+			return "", false
+		}
+		return adaptor.Field(fieldpath[1:])
+	}
+	return "", false
+}
+
 // Reference imports to suppress errors if they are not otherwise used.
 var _ context.Context
 var _ grpc.ClientConn
@@ -1119,33 +1152,34 @@ func init() {
 }
 
 var fileDescriptorEvents = []byte{
-	// 438 bytes of a gzipped FileDescriptorProto
+	// 462 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x93, 0x41, 0x6f, 0xd3, 0x30,
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x93, 0xcd, 0x8e, 0xd3, 0x30,
-	0x14, 0xc7, 0xeb, 0x8d, 0x6d, 0x8d, 0x27, 0x4d, 0xc8, 0xaa, 0x50, 0x08, 0x90, 0x56, 0xb9, 0x50,
+	0x14, 0x85, 0xeb, 0xf9, 0x6d, 0x3c, 0xd2, 0x08, 0x45, 0x15, 0x2a, 0x01, 0xd2, 0xaa, 0x1b, 0x2a,
-	0x21, 0xb0, 0x59, 0x39, 0x22, 0x21, 0x51, 0x28, 0xe7, 0xc9, 0x80, 0x84, 0xb8, 0x25, 0xd9, 0x5b,
+	0x04, 0x0e, 0x53, 0x76, 0x20, 0x21, 0x28, 0x94, 0xf5, 0x28, 0x80, 0x84, 0xd8, 0x25, 0xe9, 0x6d,
-	0x66, 0x29, 0x89, 0x43, 0xec, 0x04, 0xed, 0xc6, 0x47, 0xe0, 0xc2, 0xd7, 0xe0, 0x73, 0xf4, 0xc8,
+	0x6a, 0x29, 0xb1, 0x4d, 0xec, 0x04, 0xcd, 0x6e, 0x1e, 0x81, 0x0d, 0x6f, 0xc2, 0x86, 0x37, 0xe8,
-	0x91, 0x13, 0xb0, 0x7c, 0x12, 0xd4, 0x24, 0x6e, 0x58, 0x0b, 0x04, 0x71, 0x7b, 0xce, 0xfb, 0xbf,
+	0x92, 0x25, 0x2b, 0x60, 0xfa, 0x24, 0xa8, 0x89, 0xdd, 0x30, 0x2d, 0x10, 0x34, 0xbb, 0x6b, 0xdf,
-	0x5f, 0xfc, 0xfe, 0xff, 0x04, 0x3f, 0x8f, 0x84, 0x3e, 0x2f, 0x02, 0x1a, 0xca, 0x84, 0x85, 0x32,
+	0xe3, 0xcf, 0xb9, 0xe7, 0x38, 0xf8, 0x45, 0x4c, 0xd5, 0x3c, 0x0f, 0x49, 0xc4, 0x53, 0x2f, 0xe2,
-	0xd5, 0xbe, 0x48, 0x21, 0x3f, 0xfd, 0xb5, 0xf4, 0x33, 0xc1, 0x14, 0xe4, 0xa5, 0x08, 0x41, 0x31,
+	0x4c, 0x05, 0x94, 0x41, 0x36, 0xfd, 0xbd, 0x0c, 0x04, 0xf5, 0x24, 0x64, 0x05, 0x8d, 0x40, 0x7a,
-	0x28, 0x21, 0xd5, 0x8a, 0x95, 0xc7, 0x6d, 0x45, 0xb3, 0x5c, 0x6a, 0x49, 0xee, 0x74, 0x7a, 0x6a,
+	0x50, 0x00, 0x53, 0xd2, 0x2b, 0x4e, 0x74, 0x45, 0x44, 0xc6, 0x15, 0xb7, 0x6f, 0xd7, 0x7a, 0x62,
-	0xb4, 0xb4, 0x55, 0x94, 0xc7, 0xce, 0x28, 0x92, 0x91, 0xac, 0x95, 0x6c, 0x55, 0x35, 0x43, 0xce,
+	0xb4, 0x44, 0x2b, 0x8a, 0x13, 0xe7, 0x69, 0xe3, 0x25, 0x25, 0x26, 0xcc, 0x67, 0x9e, 0x48, 0xf2,
-	0xcd, 0x48, 0xca, 0x28, 0x06, 0x56, 0x9f, 0x82, 0xe2, 0x8c, 0xf9, 0xe9, 0x45, 0xdb, 0xba, 0xb5,
+	0x98, 0x32, 0x6f, 0x46, 0x21, 0x99, 0x8a, 0x40, 0xcd, 0xab, 0x0b, 0x9c, 0x4e, 0xcc, 0x63, 0x5e,
-	0xd9, 0x82, 0x24, 0xd3, 0xa6, 0x39, 0xde, 0x6c, 0x6a, 0x91, 0x80, 0xd2, 0x7e, 0x92, 0x35, 0x02,
+	0x96, 0xde, 0xaa, 0xd2, 0xbb, 0x37, 0x62, 0xce, 0xe3, 0x04, 0xea, 0xd3, 0x01, 0x3b, 0xd3, 0xad,
-	0x8f, 0xe3, 0xa3, 0x93, 0x22, 0x88, 0x85, 0x3a, 0xe7, 0xf0, 0xae, 0x00, 0xa5, 0xc9, 0x08, 0xef,
+	0x9b, 0x9b, 0x2d, 0x48, 0x85, 0x32, 0xcd, 0xde, 0x66, 0x53, 0xd1, 0x14, 0xa4, 0x0a, 0x52, 0x51,
-	0x69, 0x99, 0x89, 0xd0, 0x46, 0x13, 0x34, 0xb5, 0x78, 0x73, 0x20, 0xf7, 0xf0, 0x5e, 0x7d, 0x47,
+	0x09, 0x06, 0x3e, 0x3e, 0x3e, 0xcd, 0xc3, 0x84, 0xca, 0xb9, 0x0f, 0xef, 0x73, 0x90, 0xca, 0xee,
-	0x7b, 0x67, 0x82, 0xa6, 0x87, 0xb3, 0x11, 0x6d, 0xc0, 0xd4, 0x80, 0xe9, 0xd3, 0xf4, 0x82, 0x37,
+	0xe0, 0x7d, 0xc5, 0x05, 0x8d, 0xba, 0xa8, 0x8f, 0x86, 0x96, 0x5f, 0x2d, 0xec, 0xbb, 0x78, 0xbf,
-	0x12, 0xef, 0x35, 0x3e, 0x7a, 0x21, 0xf3, 0xf7, 0x7e, 0x7e, 0x6a, 0x98, 0xcf, 0xf0, 0x10, 0xd2,
+	0x9c, 0xb2, 0xbb, 0xd3, 0x47, 0xc3, 0xa3, 0x51, 0x87, 0x54, 0x60, 0x62, 0xc0, 0xe4, 0x19, 0x3b,
-	0x12, 0x62, 0x99, 0x41, 0x8d, 0x3d, 0x9c, 0xdd, 0xa5, 0x7f, 0xb5, 0x81, 0x2e, 0x5a, 0x39, 0x5f,
+	0xf3, 0x2b, 0xc9, 0xe0, 0x0d, 0x3e, 0x7e, 0xc9, 0xb3, 0x0f, 0x41, 0x36, 0x35, 0xcc, 0xe7, 0xb8,
-	0x0f, 0x7a, 0xf7, 0xf1, 0xf5, 0x97, 0x45, 0xa0, 0xc2, 0x5c, 0x04, 0x60, 0xc0, 0x36, 0x3e, 0x38,
+	0x0d, 0xac, 0x80, 0x84, 0x0b, 0x28, 0xb1, 0x47, 0xa3, 0x3b, 0xe4, 0x9f, 0x46, 0x92, 0x89, 0x96,
-	0x13, 0xb1, 0x86, 0x5c, 0xd9, 0x68, 0xb2, 0x3b, 0xb5, 0xb8, 0x39, 0x7a, 0x9f, 0x11, 0x1e, 0x1a,
+	0xfb, 0xeb, 0x83, 0x83, 0x7b, 0xf8, 0xda, 0xab, 0x3c, 0x94, 0x51, 0x46, 0x43, 0x30, 0xe0, 0x2e,
-	0x08, 0x99, 0x63, 0x6b, 0xbd, 0x78, 0x7b, 0x01, 0x67, 0x6b, 0x83, 0x57, 0x46, 0x31, 0x1f, 0x2e,
+	0x3e, 0x9c, 0xd1, 0x44, 0x41, 0x26, 0xbb, 0xa8, 0xbf, 0x3b, 0xb4, 0x7c, 0xb3, 0x1c, 0x7c, 0x46,
-	0xbf, 0x8d, 0x07, 0x1f, 0xbf, 0x8f, 0x11, 0xef, 0xc6, 0xc8, 0x6d, 0x6c, 0xa5, 0x7e, 0x02, 0x2a,
+	0xb8, 0x6d, 0x20, 0xf6, 0x18, 0x5b, 0xeb, 0xc1, 0xf5, 0x07, 0x38, 0x5b, 0x13, 0xbc, 0x36, 0x8a,
-	0xf3, 0x43, 0xa8, 0x5d, 0xb0, 0x78, 0xf7, 0xa0, 0x73, 0x6d, 0xf7, 0xb7, 0xae, 0x5d, 0xeb, 0x75,
+	0x71, 0x7b, 0xf1, 0xbd, 0xd7, 0xfa, 0xf8, 0xa3, 0x87, 0xfc, 0xfa, 0x98, 0x7d, 0x0b, 0x5b, 0x2c,
-	0x6d, 0xf6, 0x69, 0x07, 0xef, 0x2f, 0xea, 0xfd, 0xc9, 0x09, 0x3e, 0x68, 0x43, 0x21, 0x0f, 0x7a,
+	0x48, 0x41, 0x8a, 0x20, 0x82, 0xd2, 0x05, 0xcb, 0xaf, 0x37, 0x6a, 0xd7, 0x76, 0xff, 0xe8, 0xda,
-	0x7c, 0xba, 0x1a, 0x9e, 0x73, 0x63, 0xeb, 0x0d, 0x8b, 0xd5, 0xd7, 0xb0, 0x22, 0xb6, 0x91, 0xf4,
+	0x5e, 0xa3, 0x6b, 0x8f, 0xf6, 0xce, 0xbf, 0xf4, 0xd0, 0xe8, 0xd3, 0x0e, 0x3e, 0x98, 0x94, 0x2e,
-	0x12, 0xaf, 0x46, 0xf7, 0x47, 0x62, 0x84, 0xad, 0x75, 0x1a, 0x84, 0xf5, 0x30, 0x37, 0x73, 0x73,
+	0xd8, 0xa7, 0xf8, 0x50, 0x47, 0x63, 0xdf, 0x6f, 0x70, 0xeb, 0x72, 0x84, 0xce, 0xf5, 0xad, 0x7b,
-	0xfe, 0x35, 0xfe, 0x87, 0x68, 0xfe, 0x66, 0x79, 0xe9, 0x0e, 0xbe, 0x5e, 0xba, 0x83, 0x0f, 0x95,
+	0x26, 0xab, 0x37, 0xb1, 0x22, 0xea, 0x60, 0x1a, 0x89, 0x97, 0x03, 0xfc, 0x2b, 0x31, 0xc6, 0xd6,
-	0x8b, 0x96, 0x95, 0x8b, 0xbe, 0x54, 0x2e, 0xfa, 0x51, 0xb9, 0xe8, 0xed, 0x93, 0xff, 0xfc, 0x1f,
+	0x3a, 0x13, 0xdb, 0x6b, 0x60, 0x6e, 0xa6, 0xe7, 0xfc, 0xef, 0x23, 0x78, 0x80, 0xc6, 0x6f, 0x17,
-	0x1f, 0x37, 0x55, 0xb0, 0x5f, 0xaf, 0xf4, 0xe8, 0x67, 0x00, 0x00, 0x00, 0xff, 0xff, 0x3b, 0x5d,
+	0x17, 0x6e, 0xeb, 0xdb, 0x85, 0xdb, 0x3a, 0x5f, 0xba, 0x68, 0xb1, 0x74, 0xd1, 0xd7, 0xa5, 0x8b,
-	0x09, 0xd6, 0xd8, 0x03, 0x00, 0x00,
+	0x7e, 0x2e, 0x5d, 0xf4, 0xee, 0xc9, 0x15, 0xff, 0xeb, 0xc7, 0x55, 0x15, 0x1e, 0x94, 0x23, 0x3d,
+	0xfc, 0x15, 0x00, 0x00, 0xff, 0xff, 0x1c, 0x38, 0x37, 0x72, 0x20, 0x04, 0x00, 0x00,
 }

api/services/events/v1/events.proto

@@ -2,6 +2,7 @@ syntax = "proto3";
 
 package containerd.services.events.v1;
 
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
 import "gogoproto/gogo.proto";
 import "google/protobuf/any.proto";
 import "google/protobuf/empty.proto";
@@ -47,6 +48,7 @@ message SubscribeRequest {
 }
 
 message Envelope {
+	option (containerd.plugin.fieldpath) = true;
 	google.protobuf.Timestamp timestamp = 1 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
 	string namespace = 2;
 	string topic = 3;

api/services/events/v1/image.pb.go

@@ -7,6 +7,7 @@ package events
 import proto "github.com/gogo/protobuf/proto"
 import fmt "fmt"
 import math "math"
+import _ "github.com/containerd/containerd/protobuf/plugin"
 
 import strings "strings"
 import reflect "reflect"
@@ -50,6 +51,64 @@ func init() {
 	proto.RegisterType((*ImageUpdate)(nil), "containerd.services.images.v1.ImageUpdate")
 	proto.RegisterType((*ImageDelete)(nil), "containerd.services.images.v1.ImageDelete")
 }
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ImageCreate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	case "labels":
+		// Labels fields have been special-cased by name. If this breaks,
+		// add better special casing to fieldpath plugin.
+		if len(m.Labels) == 0 {
+			return "", false
+		}
+		value, ok := m.Labels[strings.Join(fieldpath[1:], ".")]
+		return value, ok
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ImageUpdate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	case "labels":
+		// Labels fields have been special-cased by name. If this breaks,
+		// add better special casing to fieldpath plugin.
+		if len(m.Labels) == 0 {
+			return "", false
+		}
+		value, ok := m.Labels[strings.Join(fieldpath[1:], ".")]
+		return value, ok
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *ImageDelete) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	}
+	return "", false
+}
 func (m *ImageCreate) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -881,22 +940,24 @@ func init() {
 }
 
 var fileDescriptorImage = []byte{
-	// 263 bytes of a gzipped FileDescriptorProto
+	// 296 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x72, 0x4e, 0xcf, 0x2c, 0xc9,
 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0x4f, 0xce, 0xcf, 0x2b, 0x49, 0xcc, 0xcc, 0x4b, 0x2d,
 	0x4a, 0x41, 0x66, 0x26, 0x16, 0x64, 0xea, 0x17, 0xa7, 0x16, 0x95, 0x65, 0x26, 0xa7, 0x16, 0xeb,
 	0xa7, 0x96, 0xa5, 0xe6, 0x95, 0x14, 0xeb, 0x97, 0x19, 0xea, 0x67, 0xe6, 0x26, 0xa6, 0xa7, 0xea,
 	0x15, 0x14, 0xe5, 0x97, 0xe4, 0x0b, 0xc9, 0x22, 0x94, 0xeb, 0xc1, 0x94, 0xea, 0x81, 0x15, 0x14,
-	0xeb, 0x95, 0x19, 0x2a, 0xad, 0x61, 0xe4, 0xe2, 0xf6, 0x04, 0xf1, 0x9c, 0x8b, 0x52, 0x13, 0x4b,
+	0xeb, 0x95, 0x19, 0x4a, 0x39, 0x10, 0xb4, 0x03, 0x6c, 0x4c, 0x52, 0x69, 0x9a, 0x7e, 0x41, 0x4e,
-	0x52, 0x85, 0x84, 0xb8, 0x58, 0xf2, 0x12, 0x73, 0x53, 0x25, 0x18, 0x15, 0x18, 0x35, 0x38, 0x83,
+	0x69, 0x7a, 0x66, 0x9e, 0x7e, 0x5a, 0x66, 0x6a, 0x4e, 0x4a, 0x41, 0x62, 0x49, 0x06, 0xc4, 0x02,
-	0xc0, 0x6c, 0x21, 0x3f, 0x2e, 0xb6, 0x9c, 0xc4, 0xa4, 0xd4, 0x9c, 0x62, 0x09, 0x26, 0x05, 0x66,
+	0xa5, 0x35, 0x8c, 0x5c, 0xdc, 0x9e, 0x20, 0xf3, 0x9c, 0x8b, 0x52, 0x13, 0x4b, 0x52, 0x85, 0x84,
-	0x0d, 0x6e, 0x23, 0x33, 0x3d, 0xbc, 0x66, 0xea, 0x21, 0x99, 0xa7, 0xe7, 0x03, 0xd6, 0xe8, 0x9a,
+	0xb8, 0x58, 0xf2, 0x12, 0x73, 0x53, 0x25, 0x18, 0x15, 0x18, 0x35, 0x38, 0x83, 0xc0, 0x6c, 0x21,
-	0x57, 0x52, 0x54, 0x19, 0x04, 0x35, 0x45, 0xca, 0x92, 0x8b, 0x1b, 0x49, 0x58, 0x48, 0x80, 0x8b,
+	0x3f, 0x2e, 0xb6, 0x9c, 0xc4, 0xa4, 0xd4, 0x9c, 0x62, 0x09, 0x26, 0x05, 0x66, 0x0d, 0x6e, 0x23,
-	0x39, 0x3b, 0xb5, 0x12, 0x6a, 0x23, 0x88, 0x29, 0x24, 0xc2, 0xc5, 0x5a, 0x96, 0x98, 0x53, 0x9a,
+	0x33, 0x3d, 0xbc, 0xae, 0xd2, 0x43, 0x32, 0x4f, 0xcf, 0x07, 0xac, 0xd1, 0x35, 0xaf, 0xa4, 0xa8,
-	0x2a, 0xc1, 0x04, 0x16, 0x83, 0x70, 0xac, 0x98, 0x2c, 0x18, 0x11, 0xce, 0x0d, 0x2d, 0x48, 0xa1,
+	0x32, 0x08, 0x6a, 0x8a, 0x94, 0x25, 0x17, 0x37, 0x92, 0xb0, 0x90, 0x00, 0x17, 0x73, 0x76, 0x6a,
-	0xaa, 0x73, 0x21, 0xe6, 0x51, 0xdb, 0xb9, 0x8a, 0x50, 0xd7, 0xba, 0xa4, 0xe6, 0xa4, 0x62, 0x77,
+	0x25, 0xd4, 0x46, 0x10, 0x53, 0x48, 0x84, 0x8b, 0xb5, 0x2c, 0x31, 0xa7, 0x34, 0x55, 0x82, 0x09,
-	0xad, 0x53, 0xc4, 0x89, 0x87, 0x72, 0x0c, 0x37, 0x1e, 0xca, 0x31, 0x34, 0x3c, 0x92, 0x63, 0x3c,
+	0x2c, 0x06, 0xe1, 0x58, 0x31, 0x59, 0x30, 0x22, 0x9c, 0x1b, 0x5a, 0x90, 0x42, 0x55, 0xe7, 0x42,
-	0xf1, 0x48, 0x8e, 0xf1, 0xc2, 0x23, 0x39, 0xc6, 0x07, 0x8f, 0xe4, 0x18, 0xa3, 0xec, 0xc8, 0x8c,
+	0xcc, 0xa3, 0xb6, 0x73, 0x15, 0xa1, 0xae, 0x75, 0x49, 0xcd, 0x49, 0xc5, 0xee, 0x5a, 0xa7, 0x98,
-	0x7e, 0x6b, 0x08, 0x2b, 0x89, 0x0d, 0x9c, 0x00, 0x8c, 0x01, 0x01, 0x00, 0x00, 0xff, 0xff, 0x13,
+	0x13, 0x0f, 0xe5, 0x18, 0x6e, 0x3c, 0x94, 0x63, 0x68, 0x78, 0x24, 0xc7, 0x78, 0xe2, 0x91, 0x1c,
-	0x7c, 0x2c, 0x4a, 0x47, 0x02, 0x00, 0x00,
+	0xe3, 0x85, 0x47, 0x72, 0x8c, 0x0f, 0x1e, 0xc9, 0x31, 0x2e, 0xf8, 0x22, 0xc7, 0x18, 0x65, 0x47,
+	0x66, 0x22, 0xb2, 0x86, 0xb0, 0x92, 0xd8, 0xc0, 0xb1, 0x6c, 0x0c, 0x08, 0x00, 0x00, 0xff, 0xff,
+	0x44, 0x99, 0x59, 0x31, 0x8d, 0x02, 0x00, 0x00,
 }

api/services/events/v1/image.proto

@@ -2,7 +2,10 @@ syntax = "proto3";
 
 package containerd.services.images.v1;
 
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
+
 option go_package = "github.com/containerd/containerd/api/services/events/v1;events";
+option (containerd.plugin.fieldpath_all) = true;
 
 message ImageCreate {
 	string name = 1;

api/services/events/v1/namespace.pb.go

@@ -8,6 +8,7 @@ import proto "github.com/gogo/protobuf/proto"
 import fmt "fmt"
 import math "math"
 import _ "github.com/gogo/protobuf/gogoproto"
+import _ "github.com/containerd/containerd/protobuf/plugin"
 
 import strings "strings"
 import reflect "reflect"
@@ -51,6 +52,64 @@ func init() {
 	proto.RegisterType((*NamespaceUpdate)(nil), "containerd.services.events.v1.NamespaceUpdate")
 	proto.RegisterType((*NamespaceDelete)(nil), "containerd.services.events.v1.NamespaceDelete")
 }
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *NamespaceCreate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	case "labels":
+		// Labels fields have been special-cased by name. If this breaks,
+		// add better special casing to fieldpath plugin.
+		if len(m.Labels) == 0 {
+			return "", false
+		}
+		value, ok := m.Labels[strings.Join(fieldpath[1:], ".")]
+		return value, ok
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *NamespaceUpdate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	case "labels":
+		// Labels fields have been special-cased by name. If this breaks,
+		// add better special casing to fieldpath plugin.
+		if len(m.Labels) == 0 {
+			return "", false
+		}
+		value, ok := m.Labels[strings.Join(fieldpath[1:], ".")]
+		return value, ok
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *NamespaceDelete) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	}
+	return "", false
+}
 func (m *NamespaceCreate) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -882,23 +941,25 @@ func init() {
 }
 
 var fileDescriptorNamespace = []byte{
-	// 277 bytes of a gzipped FileDescriptorProto
+	// 310 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x72, 0x4f, 0xcf, 0x2c, 0xc9,
 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0x4f, 0xce, 0xcf, 0x2b, 0x49, 0xcc, 0xcc, 0x4b, 0x2d,
 	0x4a, 0x41, 0x66, 0x26, 0x16, 0x64, 0xea, 0x17, 0xa7, 0x16, 0x95, 0x65, 0x26, 0xa7, 0x16, 0xeb,
 	0xa7, 0x96, 0xa5, 0xe6, 0x95, 0x14, 0xeb, 0x97, 0x19, 0xea, 0xe7, 0x25, 0xe6, 0xa6, 0x16, 0x17,
 	0x24, 0x26, 0xa7, 0xea, 0x15, 0x14, 0xe5, 0x97, 0xe4, 0x0b, 0xc9, 0x22, 0xb4, 0xe8, 0xc1, 0x94,
 	0xeb, 0x41, 0x94, 0xeb, 0x95, 0x19, 0x4a, 0x89, 0xa4, 0xe7, 0xa7, 0xe7, 0x83, 0x55, 0xea, 0x83,
-	0x58, 0x10, 0x4d, 0x4a, 0x5b, 0x18, 0xb9, 0xf8, 0xfd, 0x60, 0x06, 0x39, 0x17, 0xa5, 0x26, 0x96,
+	0x58, 0x10, 0x4d, 0x52, 0x0e, 0x04, 0x6d, 0x07, 0xab, 0x4b, 0x2a, 0x4d, 0xd3, 0x2f, 0xc8, 0x29,
-	0xa4, 0x0a, 0x09, 0x71, 0xb1, 0x80, 0xcc, 0x96, 0x60, 0x54, 0x60, 0xd4, 0xe0, 0x0c, 0x02, 0xb3,
+	0x4d, 0xcf, 0xcc, 0xd3, 0x4f, 0xcb, 0x4c, 0xcd, 0x49, 0x29, 0x48, 0x2c, 0xc9, 0x80, 0x98, 0xa0,
-	0x85, 0x82, 0xb8, 0xd8, 0x72, 0x12, 0x93, 0x52, 0x73, 0x8a, 0x25, 0x98, 0x14, 0x98, 0x35, 0xb8,
+	0xb4, 0x85, 0x91, 0x8b, 0xdf, 0x0f, 0xe6, 0x14, 0xe7, 0xa2, 0xd4, 0xc4, 0x92, 0x54, 0x21, 0x21,
-	0x8d, 0xac, 0xf4, 0xf0, 0xda, 0xa6, 0x87, 0x66, 0xa6, 0x9e, 0x0f, 0x58, 0xb3, 0x6b, 0x5e, 0x49,
+	0x2e, 0x16, 0x90, 0xeb, 0x24, 0x18, 0x15, 0x18, 0x35, 0x38, 0x83, 0xc0, 0x6c, 0xa1, 0x20, 0x2e,
-	0x51, 0x65, 0x10, 0xd4, 0x24, 0x29, 0x4b, 0x2e, 0x6e, 0x24, 0x61, 0x21, 0x01, 0x2e, 0xe6, 0xec,
+	0xb6, 0x9c, 0xc4, 0xa4, 0xd4, 0x9c, 0x62, 0x09, 0x26, 0x05, 0x66, 0x0d, 0x6e, 0x23, 0x2b, 0x3d,
-	0xd4, 0x4a, 0xa8, 0xad, 0x20, 0xa6, 0x90, 0x08, 0x17, 0x6b, 0x59, 0x62, 0x4e, 0x69, 0xaa, 0x04,
+	0xbc, 0xee, 0xd5, 0x43, 0x33, 0x53, 0xcf, 0x07, 0xac, 0xd9, 0x35, 0xaf, 0xa4, 0xa8, 0x32, 0x08,
-	0x13, 0x58, 0x0c, 0xc2, 0xb1, 0x62, 0xb2, 0x60, 0x44, 0x75, 0x76, 0x68, 0x41, 0x0a, 0xd5, 0x9d,
+	0x6a, 0x92, 0x94, 0x25, 0x17, 0x37, 0x92, 0xb0, 0x90, 0x00, 0x17, 0x73, 0x76, 0x6a, 0x25, 0xd4,
-	0x0d, 0x31, 0x93, 0xda, 0xce, 0x56, 0x45, 0x72, 0xb5, 0x4b, 0x6a, 0x4e, 0x2a, 0x76, 0x57, 0x3b,
+	0x56, 0x10, 0x53, 0x48, 0x84, 0x8b, 0xb5, 0x2c, 0x31, 0xa7, 0x34, 0x55, 0x82, 0x09, 0x2c, 0x06,
-	0x45, 0x9c, 0x78, 0x28, 0xc7, 0x70, 0xe3, 0xa1, 0x1c, 0x43, 0xc3, 0x23, 0x39, 0xc6, 0x13, 0x8f,
+	0xe1, 0x58, 0x31, 0x59, 0x30, 0xa2, 0x3a, 0x3b, 0xb4, 0x20, 0x85, 0xea, 0xce, 0x86, 0x98, 0x49,
-	0xe4, 0x18, 0x2f, 0x3c, 0x92, 0x63, 0x7c, 0xf0, 0x48, 0x8e, 0x31, 0xca, 0x8e, 0xcc, 0xc4, 0x62,
+	0x6d, 0x67, 0xab, 0x22, 0xb9, 0xda, 0x25, 0x35, 0x27, 0x15, 0xbb, 0xab, 0x9d, 0x62, 0x4e, 0x3c,
-	0x0d, 0x61, 0x25, 0xb1, 0x81, 0x63, 0xdd, 0x18, 0x10, 0x00, 0x00, 0xff, 0xff, 0xbe, 0xf0, 0x68,
+	0x94, 0x63, 0xb8, 0xf1, 0x50, 0x8e, 0xa1, 0xe1, 0x91, 0x1c, 0xe3, 0x89, 0x47, 0x72, 0x8c, 0x17,
-	0xa6, 0x75, 0x02, 0x00, 0x00,
+	0x1e, 0xc9, 0x31, 0x3e, 0x78, 0x24, 0xc7, 0xb8, 0xe0, 0x8b, 0x1c, 0x63, 0x94, 0x1d, 0x99, 0x49,
+	0xce, 0x1a, 0xc2, 0x4a, 0x62, 0x03, 0xc7, 0xbc, 0x31, 0x20, 0x00, 0x00, 0xff, 0xff, 0x58, 0x7e,
+	0x6c, 0xc6, 0xbb, 0x02, 0x00, 0x00,
 }

api/services/events/v1/namespace.proto

@@ -3,8 +3,10 @@ syntax = "proto3";
 package containerd.services.events.v1;
 
 import "gogoproto/gogo.proto";
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
 
 option go_package = "github.com/containerd/containerd/api/services/events/v1;events";
+option (containerd.plugin.fieldpath_all) = true;
 
 message NamespaceCreate {
 	string name = 1;

api/services/events/v1/snapshot.pb.go

@@ -7,6 +7,7 @@ package events
 import proto "github.com/gogo/protobuf/proto"
 import fmt "fmt"
 import math "math"
+import _ "github.com/containerd/containerd/protobuf/plugin"
 
 import strings "strings"
 import reflect "reflect"
@@ -49,6 +50,52 @@ func init() {
 	proto.RegisterType((*SnapshotCommit)(nil), "containerd.services.events.v1.SnapshotCommit")
 	proto.RegisterType((*SnapshotRemove)(nil), "containerd.services.events.v1.SnapshotRemove")
 }
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *SnapshotPrepare) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "key":
+		return string(m.Key), len(m.Key) > 0
+	case "parent":
+		return string(m.Parent), len(m.Parent) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *SnapshotCommit) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "key":
+		return string(m.Key), len(m.Key) > 0
+	case "name":
+		return string(m.Name), len(m.Name) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *SnapshotRemove) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "key":
+		return string(m.Key), len(m.Key) > 0
+	}
+	return "", false
+}
 func (m *SnapshotPrepare) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -656,19 +703,21 @@ func init() {
 }
 
 var fileDescriptorSnapshot = []byte{
-	// 219 bytes of a gzipped FileDescriptorProto
+	// 252 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x72, 0x4b, 0xcf, 0x2c, 0xc9,
 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0x4f, 0xce, 0xcf, 0x2b, 0x49, 0xcc, 0xcc, 0x4b, 0x2d,
 	0x4a, 0x41, 0x66, 0x26, 0x16, 0x64, 0xea, 0x17, 0xa7, 0x16, 0x95, 0x65, 0x26, 0xa7, 0x16, 0xeb,
 	0xa7, 0x96, 0xa5, 0xe6, 0x95, 0x14, 0xeb, 0x97, 0x19, 0xea, 0x17, 0xe7, 0x25, 0x16, 0x14, 0x67,
 	0xe4, 0x97, 0xe8, 0x15, 0x14, 0xe5, 0x97, 0xe4, 0x0b, 0xc9, 0x22, 0x74, 0xe8, 0xc1, 0x54, 0xeb,
-	0x41, 0x54, 0xeb, 0x95, 0x19, 0x2a, 0x59, 0x73, 0xf1, 0x07, 0x43, 0x35, 0x04, 0x14, 0xa5, 0x16,
+	0x41, 0x54, 0xeb, 0x95, 0x19, 0x4a, 0x39, 0x10, 0xb4, 0x06, 0x6c, 0x4c, 0x52, 0x69, 0x9a, 0x7e,
-	0x24, 0x16, 0xa5, 0x0a, 0x09, 0x70, 0x31, 0x67, 0xa7, 0x56, 0x4a, 0x30, 0x2a, 0x30, 0x6a, 0x70,
+	0x41, 0x4e, 0x69, 0x7a, 0x66, 0x9e, 0x7e, 0x5a, 0x66, 0x6a, 0x4e, 0x4a, 0x41, 0x62, 0x49, 0x06,
-	0x06, 0x81, 0x98, 0x42, 0x62, 0x5c, 0x6c, 0x20, 0x99, 0xbc, 0x12, 0x09, 0x26, 0xb0, 0x20, 0x94,
+	0xc4, 0x02, 0x25, 0x6b, 0x2e, 0xfe, 0x60, 0xa8, 0x95, 0x01, 0x45, 0xa9, 0x05, 0x89, 0x45, 0xa9,
-	0xa7, 0x64, 0xc6, 0xc5, 0x07, 0xd3, 0xec, 0x9c, 0x9f, 0x9b, 0x9b, 0x59, 0x82, 0x45, 0xaf, 0x10,
+	0x42, 0x02, 0x5c, 0xcc, 0xd9, 0xa9, 0x95, 0x12, 0x8c, 0x0a, 0x8c, 0x1a, 0x9c, 0x41, 0x20, 0xa6,
-	0x17, 0x4b, 0x5e, 0x62, 0x6e, 0x2a, 0x54, 0x27, 0x98, 0xad, 0xa4, 0x84, 0xd0, 0x17, 0x94, 0x9a,
+	0x90, 0x18, 0x17, 0x1b, 0x48, 0x26, 0xaf, 0x44, 0x82, 0x09, 0x2c, 0x08, 0xe5, 0x29, 0x99, 0x71,
-	0x9b, 0x5f, 0x86, 0xc5, 0x4e, 0xa7, 0x88, 0x13, 0x0f, 0xe5, 0x18, 0x6e, 0x3c, 0x94, 0x63, 0x68,
+	0xf1, 0xc1, 0x34, 0x3b, 0xe7, 0xe7, 0xe6, 0x66, 0x96, 0x60, 0xd1, 0x2b, 0xc4, 0xc5, 0x92, 0x97,
-	0x78, 0x24, 0xc7, 0x78, 0xe2, 0x91, 0x1c, 0xe3, 0x85, 0x47, 0x72, 0x8c, 0x0f, 0x1e, 0xc9, 0x31,
+	0x98, 0x9b, 0x0a, 0xd5, 0x09, 0x66, 0x2b, 0x29, 0x21, 0xf4, 0x05, 0xa5, 0xe6, 0xe6, 0x97, 0x61,
-	0x46, 0xd9, 0x91, 0x19, 0x32, 0xd6, 0x10, 0x56, 0x12, 0x1b, 0x38, 0x60, 0x8c, 0x01, 0x01, 0x00,
+	0xb1, 0xd3, 0x29, 0xe6, 0xc4, 0x43, 0x39, 0x86, 0x1b, 0x0f, 0xe5, 0x18, 0x1a, 0x1e, 0xc9, 0x31,
-	0x00, 0xff, 0xff, 0x10, 0x4c, 0x3d, 0xb2, 0x62, 0x01, 0x00, 0x00,
+	0x9e, 0x78, 0x24, 0xc7, 0x78, 0xe1, 0x91, 0x1c, 0xe3, 0x83, 0x47, 0x72, 0x8c, 0x0b, 0xbe, 0xc8,
+	0x31, 0x46, 0xd9, 0x91, 0x19, 0xbe, 0xd6, 0x10, 0x56, 0x12, 0x1b, 0xd8, 0xf7, 0xc6, 0x80, 0x00,
+	0x00, 0x00, 0xff, 0xff, 0x3a, 0x82, 0x7a, 0xa7, 0xa8, 0x01, 0x00, 0x00,
 }

api/services/events/v1/snapshot.proto

@@ -2,7 +2,10 @@ syntax = "proto3";
 
 package containerd.services.events.v1;
 
+import "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto";
+
 option go_package = "github.com/containerd/containerd/api/services/events/v1;events";
+option (containerd.plugin.fieldpath_all) = true;
 
 message SnapshotPrepare {
 	string key = 1;

api/services/events/v1/task.pb.go

@@ -10,6 +10,7 @@ import math "math"
 import _ "github.com/gogo/protobuf/gogoproto"
 import _ "github.com/gogo/protobuf/types"
 import containerd_types "github.com/containerd/containerd/api/types"
+import _ "github.com/containerd/containerd/protobuf/plugin"
 
 import time "time"
 
@@ -137,6 +138,184 @@ func init() {
 	proto.RegisterType((*TaskResumed)(nil), "containerd.services.events.v1.TaskResumed")
 	proto.RegisterType((*TaskCheckpointed)(nil), "containerd.services.events.v1.TaskCheckpointed")
 }
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskCreate) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	// unhandled: rootfs
+	// unhandled: pid
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	case "bundle":
+		return string(m.Bundle), len(m.Bundle) > 0
+	case "io":
+		// NOTE(stevvooe): This is probably not correct in many cases.
+		// We assume that the target message also implements the Field
+		// method, which isn't likely true in a lot of cases.
+		//
+		// If you have a broken build and have found this comment,
+		// you may be closer to a solution.
+		if m.IO == nil {
+			return "", false
+		}
+
+		return m.IO.Field(fieldpath[1:])
+	case "checkpoint":
+		return string(m.Checkpoint), len(m.Checkpoint) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskStart) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	// unhandled: pid
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskDelete) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	// unhandled: pid
+	// unhandled: exit_status
+	// unhandled: exited_at
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskIO) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "stdin":
+		return string(m.Stdin), len(m.Stdin) > 0
+	case "stdout":
+		return string(m.Stdout), len(m.Stdout) > 0
+	case "stderr":
+		return string(m.Stderr), len(m.Stderr) > 0
+	case "terminal":
+		return fmt.Sprint(m.Terminal), true
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskExit) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	// unhandled: pid
+	// unhandled: exit_status
+	// unhandled: exited_at
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	case "id":
+		return string(m.ID), len(m.ID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskOOM) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskExecAdded) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	// unhandled: pid
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	case "exec_id":
+		return string(m.ExecID), len(m.ExecID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskPaused) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskResumed) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	}
+	return "", false
+}
+
+// Field returns the value for the given fieldpath as a string, if defined.
+// If the value is not defined, the second value will be false.
+func (m *TaskCheckpointed) Field(fieldpath []string) (string, bool) {
+	if len(fieldpath) == 0 {
+		return "", false
+	}
+
+	switch fieldpath[0] {
+	case "container_id":
+		return string(m.ContainerID), len(m.ContainerID) > 0
+	case "checkpoint":
+		return string(m.Checkpoint), len(m.Checkpoint) > 0
+	}
+	return "", false
+}
 func (m *TaskCreate) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -2215,43 +2394,45 @@ func init() {
 }
 
 var fileDescriptorTask = []byte{
-	// 607 bytes of a gzipped FileDescriptorProto
+	// 634 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x94, 0xcf, 0x6e, 0xd3, 0x40,
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x95, 0xcd, 0x6e, 0xd3, 0x40,
-	0x10, 0xc6, 0x6b, 0xa7, 0x75, 0x93, 0x09, 0x15, 0x95, 0x55, 0x41, 0x14, 0x09, 0x3b, 0x32, 0x42,
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+	0x64, 0x4b, 0xc2, 0x00, 0xbf, 0x17, 0x04, 0x10, 0x54, 0x22, 0x72, 0x9f, 0x6c, 0xc2, 0x39, 0xf8,
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+	0xe3, 0x12, 0x0b, 0xc9, 0x96, 0xa6, 0x26, 0x34, 0x87, 0x03, 0x57, 0x13, 0x9f, 0x86, 0x7f, 0xc0,
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+	0x63, 0x1d, 0xc8, 0x6d, 0x7d, 0xe6, 0xa5, 0xbc, 0xda, 0xc1, 0x56, 0x8f, 0x34, 0x85, 0x82, 0x0b,
-	0xab, 0x6b, 0x6b, 0xe3, 0xeb, 0xb5, 0xb5, 0xf1, 0x21, 0xb3, 0xb4, 0xab, 0xcc, 0xd2, 0xbe, 0x64,
+	0x3c, 0x0d, 0x2b, 0x4a, 0x4c, 0xc9, 0x76, 0xfe, 0x04, 0x95, 0x3f, 0xd5, 0x8a, 0x0c, 0x7e, 0x7e,
-	0x96, 0xf6, 0x3d, 0xb3, 0xb4, 0x37, 0xcf, 0x4a, 0xee, 0xf5, 0xa7, 0xea, 0x34, 0x32, 0xf2, 0x49,
+	0x00, 0xd4, 0x5f, 0x1f, 0x80, 0xfe, 0xcb, 0x8b, 0x4b, 0x63, 0xed, 0xf3, 0xa5, 0xb1, 0xf6, 0x36,
-	0x79, 0xfc, 0x33, 0x00, 0x00, 0xff, 0xff, 0xbd, 0xfa, 0x67, 0x90, 0x20, 0x06, 0x00, 0x00,
+	0x33, 0x94, 0x8b, 0xcc, 0x50, 0x3e, 0x65, 0x86, 0xf2, 0x35, 0x33, 0x94, 0xf7, 0xdf, 0x0c, 0xe5,
+	0xc5, 0x93, 0x8a, 0xff, 0x0e, 0x8f, 0xa5, 0x35, 0xd1, 0xf2, 0x6d, 0x79, 0xf8, 0x23, 0x00, 0x00,
+	0xff, 0xff, 0xfd, 0xdf, 0x0f, 0x7f, 0x66, 0x06, 0x00, 0x00,
 }

api/services/events/v1/task.proto

@@ -5,8 +5,10 @@ package containerd.services.events.v1;
 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/services/events/v1;events";
+option (containerd.plugin.fieldpath_all) = true;
 
 message TaskCreate {
 	string container_id = 1;

cmd/protoc-gen-gogoctrd/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	_ "github.com/containerd/containerd/protobuf/plugin/fieldpath"
 	"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
 	"github.com/gogo/protobuf/vanity"
 	"github.com/gogo/protobuf/vanity/command"

events/exchange.go

@@ -219,25 +219,8 @@ func validateEnvelope(envelope *events.Envelope) error {
 }
 
 func adapt(ev interface{}) filters.Adaptor {
-	switch ev := ev.(type) {
+	if adaptor, ok := ev.(filters.Adaptor); ok {
-	case *events.Envelope:
+		return adaptor
-		return filters.AdapterFunc(func(fieldpath []string) (string, bool) {
-			if len(fieldpath) == 0 {
-				return "", false
-			}
-
-			switch fieldpath[0] {
-			case "namespace":
-				return ev.Namespace, len(ev.Namespace) > 0
-			case "topic":
-				return ev.Topic, len(ev.Topic) > 0
-			default:
-				// TODO(stevvooe): Handle event fields.
-				return "", false
-			}
-		})
-	case filters.Adaptor:
-		return ev
 	}
 
 	return filters.AdapterFunc(func(fieldpath []string) (string, bool) {

protobuf/plugin/doc.go

@@ -0,0 +1 @@
+package plugin

protobuf/plugin/fieldpath.pb.go

@@ -0,0 +1,73 @@
+// Code generated by protoc-gen-gogo.
+// source: github.com/containerd/containerd/protobuf/plugin/fieldpath.proto
+// DO NOT EDIT!
+
+/*
+Package plugin is a generated protocol buffer package.
+
+It is generated from these files:
+	github.com/containerd/containerd/protobuf/plugin/fieldpath.proto
+
+It has these top-level messages:
+*/
+package plugin
+
+import proto "github.com/gogo/protobuf/proto"
+import fmt "fmt"
+import math "math"
+import google_protobuf "github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
+
+var E_FieldpathAll = &proto.ExtensionDesc{
+	ExtendedType:  (*google_protobuf.FileOptions)(nil),
+	ExtensionType: (*bool)(nil),
+	Field:         63300,
+	Name:          "containerd.plugin.fieldpath_all",
+	Tag:           "varint,63300,opt,name=fieldpath_all,json=fieldpathAll",
+	Filename:      "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto",
+}
+
+var E_Fieldpath = &proto.ExtensionDesc{
+	ExtendedType:  (*google_protobuf.MessageOptions)(nil),
+	ExtensionType: (*bool)(nil),
+	Field:         64400,
+	Name:          "containerd.plugin.fieldpath",
+	Tag:           "varint,64400,opt,name=fieldpath",
+	Filename:      "github.com/containerd/containerd/protobuf/plugin/fieldpath.proto",
+}
+
+func init() {
+	proto.RegisterExtension(E_FieldpathAll)
+	proto.RegisterExtension(E_Fieldpath)
+}
+
+func init() {
+	proto.RegisterFile("github.com/containerd/containerd/protobuf/plugin/fieldpath.proto", fileDescriptorFieldpath)
+}
+
+var fileDescriptorFieldpath = []byte{
+	// 203 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x72, 0x48, 0xcf, 0x2c, 0xc9,
+	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0x4f, 0xce, 0xcf, 0x2b, 0x49, 0xcc, 0xcc, 0x4b, 0x2d,
+	0x4a, 0x41, 0x66, 0x16, 0x14, 0xe5, 0x97, 0xe4, 0x27, 0x95, 0xa6, 0xe9, 0x17, 0xe4, 0x94, 0xa6,
+	0x67, 0xe6, 0xe9, 0xa7, 0x65, 0xa6, 0xe6, 0xa4, 0x14, 0x24, 0x96, 0x64, 0xe8, 0x81, 0x65, 0x84,
+	0x04, 0x11, 0x6a, 0xf5, 0x20, 0x4a, 0xa4, 0x14, 0xd2, 0xf3, 0xf3, 0xd3, 0x73, 0x52, 0x11, 0x5a,
+	0x53, 0x52, 0x8b, 0x93, 0x8b, 0x32, 0x0b, 0x4a, 0xf2, 0x8b, 0x20, 0x9a, 0xac, 0x9c, 0xb9, 0x78,
+	0xe1, 0xe6, 0xc4, 0x27, 0xe6, 0xe4, 0x08, 0xc9, 0xe8, 0x41, 0xf4, 0xe8, 0xc1, 0xf4, 0xe8, 0xb9,
+	0x65, 0xe6, 0xa4, 0xfa, 0x17, 0x94, 0x64, 0xe6, 0xe7, 0x15, 0x4b, 0x1c, 0x79, 0xc7, 0xac, 0xc0,
+	0xa8, 0xc1, 0x11, 0xc4, 0x03, 0xd7, 0xe4, 0x98, 0x93, 0x63, 0x65, 0xcf, 0xc5, 0x09, 0xe7, 0x0b,
+	0xc9, 0x63, 0x18, 0xe0, 0x9b, 0x5a, 0x5c, 0x9c, 0x98, 0x0e, 0x37, 0x63, 0xc2, 0x77, 0x88, 0x19,
+	0x08, 0x3d, 0x4e, 0x12, 0x27, 0x1e, 0xca, 0x31, 0xdc, 0x78, 0x28, 0xc7, 0xd0, 0xf0, 0x48, 0x8e,
+	0xf1, 0xc4, 0x23, 0x39, 0xc6, 0x0b, 0x8f, 0xe4, 0x18, 0x1f, 0x3c, 0x92, 0x63, 0x04, 0x04, 0x00,
+	0x00, 0xff, 0xff, 0xd6, 0x21, 0x2a, 0xb6, 0x17, 0x01, 0x00, 0x00,
+}

protobuf/plugin/fieldpath.proto

@@ -0,0 +1,40 @@
+// Protocol Buffers for Go with Gadgets
+//
+// Copyright (c) 2013, The GoGo Authors. All rights reserved.
+// http://github.com/gogo/protobuf
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+package containerd.plugin;
+
+import "google/protobuf/descriptor.proto";
+
+extend google.protobuf.FileOptions {
+	optional bool fieldpath_all = 63300;
+}
+
+extend google.protobuf.MessageOptions {
+	optional bool fieldpath = 64400;
+}

protobuf/plugin/fieldpath/fieldpath.go

@@ -0,0 +1,157 @@
+package fieldpath
+
+import (
+	"strings"
+
+	"github.com/containerd/containerd/protobuf/plugin"
+	"github.com/gogo/protobuf/gogoproto"
+	"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
+	"github.com/gogo/protobuf/protoc-gen-gogo/generator"
+)
+
+type fieldpathGenerator struct {
+	*generator.Generator
+	generator.PluginImports
+	typeurlPkg generator.Single
+}
+
+func init() {
+	generator.RegisterPlugin(new(fieldpathGenerator))
+}
+
+func (p *fieldpathGenerator) Name() string {
+	return "fieldpath"
+}
+
+func (p *fieldpathGenerator) Init(g *generator.Generator) {
+	p.Generator = g
+}
+
+func (p *fieldpathGenerator) Generate(file *generator.FileDescriptor) {
+	p.PluginImports = generator.NewPluginImports(p.Generator)
+	p.typeurlPkg = p.NewImport("github.com/containerd/containerd/typeurl")
+
+	for _, m := range file.Messages() {
+		if m.DescriptorProto.GetOptions().GetMapEntry() {
+			continue
+		}
+		if plugin.FieldpathEnabled(file.FileDescriptorProto, m.DescriptorProto) {
+			p.generateMessage(m)
+		}
+	}
+}
+
+func (p *fieldpathGenerator) generateMessage(m *generator.Descriptor) {
+	ccTypeName := generator.CamelCaseSlice(m.TypeName())
+
+	p.P()
+	p.P(`// Field returns the value for the given fieldpath as a string, if defined.`)
+	p.P(`// If the value is not defined, the second value will be false.`)
+	p.P("func(m *", ccTypeName, ") Field(fieldpath []string) (string, bool) {")
+	p.In()
+
+	var (
+		fields    []*descriptor.FieldDescriptorProto
+		unhandled []*descriptor.FieldDescriptorProto
+	)
+
+	for _, f := range m.Field {
+		if f.IsBool() || f.IsString() || isLabelsField(f) || isAnyField(f) || isMessageField(f) {
+			fields = append(fields, f)
+		} else {
+			unhandled = append(unhandled, f)
+		}
+	}
+
+	if len(fields) > 0 {
+		p.P(`if len(fieldpath) == 0 {`)
+		p.In()
+		p.P(`return "", false`)
+		p.Out()
+		p.P(`}`)
+		p.P()
+		p.P("switch fieldpath[0] {")
+
+		for _, f := range unhandled {
+			p.P("// unhandled: ", f.GetName())
+		}
+
+		for _, f := range fields {
+			fName := generator.CamelCase(*f.Name)
+			if gogoproto.IsCustomName(f) {
+				fName = gogoproto.GetCustomName(f)
+			}
+
+			p.P(`case "`, f.GetName(), `":`)
+			p.In()
+			switch {
+			case isLabelsField(f):
+				p.P(`// Labels fields have been special-cased by name. If this breaks,`)
+				p.P(`// add better special casing to fieldpath plugin.`)
+				p.P(`if len(m.`, fName, `) == 0 {`)
+				p.In()
+				p.P(`return "", false`)
+				p.Out()
+				p.P("}")
+				p.P(`value, ok := m.`, fName, `[strings.Join(fieldpath[1:], ".")]`)
+				p.P(`return value, ok`)
+			case isAnyField(f):
+				p.P(`decoded, err := `, p.typeurlPkg.Use(), `.UnmarshalAny(m.`, fName, `)`)
+				p.P(`if err != nil {`)
+				p.In()
+				p.P(`return "", false`)
+				p.Out()
+				p.P(`}`)
+				p.P()
+				p.P(`adaptor, ok := decoded.(interface { Field([]string) (string, bool) })`)
+				p.P(`if !ok {`)
+				p.In()
+				p.P(`return "", false`)
+				p.Out()
+				p.P(`}`)
+				p.P(`return adaptor.Field(fieldpath[1:])`)
+			case isMessageField(f):
+				p.P(`// NOTE(stevvooe): This is probably not correct in many cases.`)
+				p.P(`// We assume that the target message also implements the Field`)
+				p.P(`// method, which isn't likely true in a lot of cases.`)
+				p.P(`//`)
+				p.P(`// If you have a broken build and have found this comment,`)
+				p.P(`// you may be closer to a solution.`)
+				p.P(`if m.`, fName, ` == nil {`)
+				p.In()
+				p.P(`return "", false`)
+				p.Out()
+				p.P(`}`)
+				p.P()
+				p.P(`return m.`, fName, `.Field(fieldpath[1:])`)
+			case f.IsString():
+				p.P(`return string(m.`, fName, `), len(m.`, fName, `) > 0`)
+			case f.IsBool():
+				p.P(`return fmt.Sprint(m.`, fName, `), true`)
+			}
+			p.Out()
+		}
+
+		p.P(`}`)
+	} else {
+		for _, f := range unhandled {
+			p.P("// unhandled: ", f.GetName())
+		}
+	}
+
+	p.P(`return "", false`)
+	p.Out()
+	p.P("}")
+}
+
+func isMessageField(f *descriptor.FieldDescriptorProto) bool {
+	return !f.IsRepeated() && f.IsMessage() && f.GetTypeName() != ".google.protobuf.Timestamp"
+}
+
+func isLabelsField(f *descriptor.FieldDescriptorProto) bool {
+	return f.IsMessage() && f.GetName() == "labels" && strings.HasSuffix(f.GetTypeName(), ".LabelsEntry")
+}
+
+func isAnyField(f *descriptor.FieldDescriptorProto) bool {
+	return !f.IsRepeated() && f.IsMessage() && f.GetTypeName() == ".google.protobuf.Any"
+}

protobuf/plugin/helpers.go

@@ -0,0 +1,10 @@
+package plugin
+
+import (
+	"github.com/gogo/protobuf/proto"
+	"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
+)
+
+func FieldpathEnabled(file *descriptor.FileDescriptorProto, message *descriptor.DescriptorProto) bool {
+	return proto.GetBoolExtension(message.Options, E_Fieldpath, proto.GetBoolExtension(file.Options, E_FieldpathAll, false))
+}

typeurl/marshal_test.go

@@ -0,0 +1,62 @@
+package typeurl_test
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	eventsapi "github.com/containerd/containerd/api/services/events/v1"
+	"github.com/containerd/containerd/typeurl"
+)
+
+func TestMarshalEvent(t *testing.T) {
+	for _, testcase := range []struct {
+		event interface{}
+		url   string
+	}{
+		{
+			event: &eventsapi.TaskStart{},
+			url:   "types.containerd.io/containerd.services.events.v1.TaskStart",
+		},
+
+		{
+			event: &eventsapi.NamespaceUpdate{},
+			url:   "types.containerd.io/containerd.services.events.v1.NamespaceUpdate",
+		},
+	} {
+		t.Run(fmt.Sprintf("%T", testcase.event), func(t *testing.T) {
+			a, err := typeurl.MarshalAny(testcase.event)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if a.TypeUrl != testcase.url {
+				t.Fatalf("unexpected url: %v != %v", a.TypeUrl, testcase.url)
+			}
+
+			v, err := typeurl.UnmarshalAny(a)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !reflect.DeepEqual(v, testcase.event) {
+				t.Fatalf("round trip failed %v != %v", v, testcase.event)
+			}
+		})
+	}
+}
+
+func BenchmarkMarshalEvent(b *testing.B) {
+	ev := &eventsapi.TaskStart{}
+	expected, err := typeurl.MarshalAny(ev)
+	if err != nil {
+		b.Fatal(err)
+	}
+	for i := 0; i < b.N; i++ {
+		a, err := typeurl.MarshalAny(ev)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if a.TypeUrl != expected.TypeUrl {
+			b.Fatalf("incorrect type url: %v != %v", a, expected)
+		}
+	}
+}

typeurl/types_test.go

@@ -1,12 +1,9 @@
 package typeurl
 
 import (
-	"fmt"
 	"path/filepath"
 	"reflect"
 	"testing"
-
-	eventsapi "github.com/containerd/containerd/api/services/events/v1"
 )
 
 type test struct {
@@ -106,41 +103,6 @@ func TestIs(t *testing.T) {
 	}
 }
 
-func TestMarshalEvent(t *testing.T) {
-	for _, testcase := range []struct {
-		event interface{}
-		url   string
-	}{
-		{
-			event: &eventsapi.TaskStart{},
-			url:   "types.containerd.io/containerd.services.events.v1.TaskStart",
-		},
-
-		{
-			event: &eventsapi.NamespaceUpdate{},
-			url:   "types.containerd.io/containerd.services.events.v1.NamespaceUpdate",
-		},
-	} {
-		t.Run(fmt.Sprintf("%T", testcase.event), func(t *testing.T) {
-			a, err := MarshalAny(testcase.event)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if a.TypeUrl != testcase.url {
-				t.Fatalf("unexpected url: %v != %v", a.TypeUrl, testcase.url)
-			}
-
-			v, err := UnmarshalAny(a)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if !reflect.DeepEqual(v, testcase.event) {
-				t.Fatalf("round trip failed %v != %v", v, testcase.event)
-			}
-		})
-	}
-}
-
 func TestRegisterDiffUrls(t *testing.T) {
 	clear()
 	defer func() {
@@ -151,20 +113,3 @@ func TestRegisterDiffUrls(t *testing.T) {
 	Register(&test{}, "test")
 	Register(&test{}, "test", "two")
 }
-
-func BenchmarkMarshalEvent(b *testing.B) {
-	ev := &eventsapi.TaskStart{}
-	expected, err := MarshalAny(ev)
-	if err != nil {
-		b.Fatal(err)
-	}
-	for i := 0; i < b.N; i++ {
-		a, err := MarshalAny(ev)
-		if err != nil {
-			b.Fatal(err)
-		}
-		if a.TypeUrl != expected.TypeUrl {
-			b.Fatalf("incorrect type url: %v != %v", a, expected)
-		}
-	}
-}