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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 |
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@@ -0,0 +1,163 @@ | ||
package fieldmask | ||
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import ( | ||
"context" | ||
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" | ||
"net/http" | ||
"strings" | ||
) | ||
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const Key = "fields" | ||
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type FieldMask map[string]FieldMask | ||
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// 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 | ||
} | ||
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// 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 | ||
} | ||
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reflect := message.ProtoReflect() | ||
reflect.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool { | ||
mask, ok := fm[string(fd.Name())] | ||
if !ok { | ||
reflect.Clear(fd) | ||
} | ||
|
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if len(mask) == 0 { | ||
return true | ||
} | ||
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switch true { | ||
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 | ||
}) | ||
} | ||
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// 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 | ||
} | ||
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// 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 | ||
} | ||
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// 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) | ||
} | ||
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// 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 | ||
} | ||
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// 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 | ||
} | ||
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message, ok := resp.(proto.Message) | ||
if !ok { | ||
return resp, err | ||
} | ||
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md, ok := metadata.FromIncomingContext(ctx) | ||
if !ok { | ||
return resp, err | ||
} | ||
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fm := FromMetadata(md) | ||
fm.Filter(message) | ||
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return resp, err | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,129 @@ | ||
package fieldmask | ||
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import ( | ||
"context" | ||
"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" | ||
"net/http" | ||
"net/url" | ||
"strings" | ||
"testing" | ||
) | ||
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var p = []string{"a.b", "a.b.c", "d.e", "f"} | ||
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var m = metadata.New(map[string]string{ | ||
"fields": strings.Join(p, ","), | ||
}) | ||
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var fm = FieldMask{ | ||
"a": FieldMask{ | ||
"b": {}, | ||
}, | ||
"d": FieldMask{ | ||
"e": {}, | ||
}, | ||
"f": {}, | ||
} | ||
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var j = ` | ||
{ | ||
"a": { | ||
"b": { | ||
"c": "test value" | ||
} | ||
}, | ||
"d": { | ||
"e": "test value" | ||
}, | ||
"g": { | ||
"h": "test value" | ||
} | ||
}` | ||
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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()), | ||
}, | ||
}, | ||
} | ||
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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) | ||
} | ||
} | ||
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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) | ||
} | ||
} | ||
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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) | ||
} | ||
} | ||
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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{}) | ||
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if diff := cmp.Diff(want, got); diff != "" { | ||
t.Errorf("JSON mismatch (-want +got):\n%s", diff) | ||
} | ||
} | ||
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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) | ||
} | ||
} | ||
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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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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,18 @@ | ||
// Copyright 2023 The Tekton 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. | ||
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//go:generate rm test.pb.go | ||
//go:generate protoc --go_out=. --go_opt=paths=source_relative -I. test.proto | ||
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package test |
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