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AIP-157 Partial response implementation
This feature add capabilities to filter the response message from all the APIs. AIP detail: https://google.aip.dev/157
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| package fieldmask | ||
|
|
||
| import ( | ||
| "context" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| jsoniter "github.com/json-iterator/go" | ||
| "github.com/tidwall/gjson" | ||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/metadata" | ||
| "google.golang.org/protobuf/proto" | ||
| "google.golang.org/protobuf/reflect/protoreflect" | ||
| "google.golang.org/protobuf/types/known/fieldmaskpb" | ||
| ) | ||
|
|
||
| const key = "fields" | ||
|
|
||
| // FieldMask is recursive structure to define a path mask | ||
| type FieldMask map[string]FieldMask | ||
|
|
||
| // New create a FieldMask from the input array of paths. The array should contain JSON paths with dit "." notation. | ||
| func New(paths []string) FieldMask { | ||
| mask := make(FieldMask) | ||
| for _, path := range paths { | ||
| current := mask | ||
| fields := strings.Split(path, ".") | ||
| for _, field := range fields { | ||
| c, ok := current[field] | ||
| if !ok { | ||
| c = make(FieldMask) | ||
| current[field] = c | ||
| } | ||
| current = c | ||
| } | ||
| } | ||
| return mask | ||
| } | ||
|
|
||
| // Filter takes a Proto message as input and updates the message according to the FieldMask. | ||
| func (fm FieldMask) Filter(message proto.Message) { | ||
| if len(fm) == 0 { | ||
| return | ||
| } | ||
|
|
||
| reflect := message.ProtoReflect() | ||
| reflect.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool { | ||
| mask, ok := fm[string(fd.Name())] | ||
| if !ok { | ||
| reflect.Clear(fd) | ||
| } | ||
|
|
||
| if len(mask) == 0 { | ||
| return true | ||
| } | ||
|
|
||
| switch { | ||
| case fd.IsMap(): | ||
| m := reflect.Get(fd).Map() | ||
| m.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool { | ||
| if fm, ok := mask[k.String()]; ok { | ||
| if i, ok := v.Interface().(protoreflect.Message); ok && len(fm) > 0 { | ||
| fm.Filter(i.Interface()) | ||
| } | ||
| } else { | ||
| m.Clear(k) | ||
| } | ||
| return true | ||
| }) | ||
| case fd.IsList(): | ||
| list := reflect.Get(fd).List() | ||
| for i := 0; i < list.Len(); i++ { | ||
| mask.Filter(list.Get(i).Message().Interface()) | ||
| } | ||
| case fd.Kind() == protoreflect.MessageKind: | ||
| mask.Filter(reflect.Get(fd).Message().Interface()) | ||
| case fd.Kind() == protoreflect.BytesKind: | ||
| if b := v.Bytes(); gjson.ValidBytes(b) { | ||
| b, err := jsoniter.Marshal(mask.FilterJSON(b, []string{})) | ||
| if err == nil { | ||
| reflect.Set(fd, protoreflect.ValueOfBytes(b)) | ||
| } | ||
| } | ||
| } | ||
| return true | ||
| }) | ||
| } | ||
|
|
||
| // Paths return the dot "." JSON notation os all the paths in the FieldMask. | ||
| // Parameter root []string is used internally for recursion, but it can also be used for setting an initial root path. | ||
| func (fm FieldMask) Paths(path []string) (paths []string) { | ||
| for k, v := range fm { | ||
| path = append(path, k) | ||
| if len(v) == 0 { | ||
| paths = append(paths, strings.Join(path, ".")) | ||
| } | ||
| paths = append(paths, v.Paths(path)...) | ||
| path = path[:len(path)-1] | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // FilterJSON takes a JSON as input and return a map of the filtered JSON according to the FieldMask. | ||
| func (fm FieldMask) FilterJSON(json []byte, path []string) (out map[string]any) { | ||
| for k, v := range fm { | ||
| if out == nil { | ||
| out = make(map[string]interface{}) | ||
| } | ||
| path = append(path, k) | ||
| if len(v) == 0 { | ||
| out[k] = gjson.GetBytes(json, strings.Join(path, ".")).Value() | ||
| } else { | ||
| out[k] = v.FilterJSON(json, path) | ||
| } | ||
| path = path[:len(path)-1] | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // FromMetadata gets all the filter definitions from gRPC metadata. | ||
| func FromMetadata(md metadata.MD) FieldMask { | ||
| fm := &fieldmaskpb.FieldMask{} | ||
| masks := md.Get(key) | ||
| for _, mask := range masks { | ||
| paths := strings.Split(mask, ",") | ||
| for _, path := range paths { | ||
| fm.Paths = append(fm.Paths, strings.TrimSpace(path)) | ||
| } | ||
| } | ||
| fm.Normalize() | ||
| return New(fm.Paths) | ||
| } | ||
|
|
||
| // MetadataAnnotator injects key from query parameter to gRPC metadata (for REST client). | ||
| func MetadataAnnotator(_ context.Context, req *http.Request) metadata.MD { | ||
| if err := req.ParseForm(); err == nil && req.Form.Has(key) { | ||
| return metadata.Pairs(key, req.Form.Get(key)) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // UnaryServerInterceptor updates the response message according to the FieldMask. | ||
| func UnaryServerInterceptor() grpc.UnaryServerInterceptor { | ||
| return func(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) { | ||
| resp, err := handler(ctx, req) | ||
| if err != nil { | ||
| return resp, err | ||
| } | ||
|
|
||
| message, ok := resp.(proto.Message) | ||
| if !ok { | ||
| return resp, err | ||
| } | ||
|
|
||
| md, ok := metadata.FromIncomingContext(ctx) | ||
| if !ok { | ||
| return resp, err | ||
| } | ||
|
|
||
| fm := FromMetadata(md) | ||
| fm.Filter(message) | ||
|
|
||
| return resp, err | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package fieldmask | ||
|
|
||
| import ( | ||
| "context" | ||
| "net/http" | ||
| "net/url" | ||
| "strings" | ||
| "testing" | ||
|
|
||
| "github.com/google/go-cmp/cmp" | ||
| "github.com/tektoncd/results/internal/fieldmask/test" | ||
| "github.com/tidwall/gjson" | ||
| "google.golang.org/grpc/metadata" | ||
| "google.golang.org/protobuf/proto" | ||
| "google.golang.org/protobuf/testing/protocmp" | ||
| "google.golang.org/protobuf/types/known/fieldmaskpb" | ||
| ) | ||
|
|
||
| var p = []string{"a.b", "a.b.c", "d.e", "f"} | ||
|
|
||
| var m = metadata.New(map[string]string{ | ||
| "fields": strings.Join(p, ","), | ||
| }) | ||
|
|
||
| var fm = FieldMask{ | ||
| "a": FieldMask{ | ||
| "b": {}, | ||
| }, | ||
| "d": FieldMask{ | ||
| "e": {}, | ||
| }, | ||
| "f": {}, | ||
| } | ||
|
|
||
| var j = ` | ||
| { | ||
| "a": { | ||
| "b": { | ||
| "c": "test value" | ||
| } | ||
| }, | ||
| "d": { | ||
| "e": "test value" | ||
| }, | ||
| "g": { | ||
| "h": "test value" | ||
| } | ||
| }` | ||
|
|
||
| var pm = &test.Test{ | ||
| Id: "test-id", | ||
| Name: "test-name", | ||
| Data: []*test.Any{ | ||
| { | ||
| Type: "type-1", | ||
| Value: []byte(gjson.Parse(j).String()), | ||
| }, | ||
| { | ||
| Type: "type-2", | ||
| Value: []byte(gjson.Parse(j).String()), | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| func TestNew(t *testing.T) { | ||
| f := &fieldmaskpb.FieldMask{Paths: p} | ||
| f.Normalize() | ||
| want := fm | ||
| got := New(f.Paths) | ||
| if diff := cmp.Diff(want, got); diff != "" { | ||
| t.Errorf("Fieldmask mismatch (-want +got):\n%s", diff) | ||
| } | ||
| } | ||
|
|
||
| func TestFieldMask_Paths(t *testing.T) { | ||
| f := &fieldmaskpb.FieldMask{Paths: p} | ||
| f.Normalize() | ||
| want := f.Paths | ||
| got := fm.Paths(nil) | ||
| if diff := cmp.Diff(want, got); diff != "" { | ||
| t.Errorf("Paths mismatch (-want +got):\n%s", diff) | ||
| } | ||
| } | ||
|
|
||
| func TestFieldMask_Filter(t *testing.T) { | ||
| f := New([]string{"name", "data.value.d"}) | ||
| got := proto.Clone(pm) | ||
| f.Filter(got) | ||
| d := gjson.Parse(`{"d":{"e":"test value"}}`).String() | ||
| want := &test.Test{ | ||
| Name: "test-name", | ||
| Data: []*test.Any{ | ||
| {Value: []byte(d)}, | ||
| {Value: []byte(d)}, | ||
| }, | ||
| } | ||
| if diff := cmp.Diff(want, got, protocmp.Transform()); diff != "" { | ||
| t.Errorf("Proto mismatch (-want +got):\n%s", diff) | ||
| } | ||
| } | ||
|
|
||
| func TestFieldMask_FilterJSON(t *testing.T) { | ||
| want := gjson.Parse(`{"a":{"b":{"c":"test value"}}}`).Value() | ||
| f := New([]string{"a.b"}) | ||
| got := f.FilterJSON([]byte(j), []string{}) | ||
|
|
||
| if diff := cmp.Diff(want, got); diff != "" { | ||
| t.Errorf("JSON mismatch (-want +got):\n%s", diff) | ||
| } | ||
| } | ||
|
|
||
| func TestFromMetadata(t *testing.T) { | ||
| want := fm | ||
| got := FromMetadata(m) | ||
| if diff := cmp.Diff(want, got); diff != "" { | ||
| t.Errorf("Fieldmask mismatch (-want +got):\n%s", diff) | ||
| } | ||
| } | ||
|
|
||
| func TestMetadataAnnotator(t *testing.T) { | ||
| want := m | ||
| got := MetadataAnnotator(context.Background(), &http.Request{ | ||
| Form: url.Values{ | ||
| "fields": m.Get("fields"), | ||
| }, | ||
| }) | ||
| if diff := cmp.Diff(want, got); diff != "" { | ||
| t.Errorf("Metadata mismatch (-want +got):\n%s", diff) | ||
| } | ||
| } |
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