implement timestamp decoder for pg

cmd/protoc-gen-go/protofif/methods.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"time"
 
+	"github.com/go-pg/pg/v10/types"
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/bson/bsontype"
 )
@@ -95,6 +96,22 @@ func (ts *Timestamp) MarshalJSON() ([]byte, error) {
 	return json.Marshal(ts.AsTime())
 }
 
+func (ts *Timestamp) AppendValue(b []byte, flags int) ([]byte, error) {
+	if ts == nil {
+		return types.AppendNull(b, flags), nil
+	}
+	return types.AppendTime(b, ts.AsTimeValue(), flags), nil
+}
+
+func (ts *Timestamp) ScanValue(rd types.Reader, n int) error {
+	tm, err := types.ScanTime(rd, n)
+	if err != nil {
+		return err
+	}
+	*ts = NewTimestampValue(tm)
+	return nil
+}
+
 func (ts *Timestamp) MarshalBSONValue() (bsontype.Type, []byte, error) {
 	if ts == nil {
 		return bson.TypeNull, nil, nil

go.mod

@@ -4,10 +4,10 @@ go 1.11
 
 require (
 	github.com/fatih/structtag v1.2.0
+	github.com/go-pg/pg/v10 v10.13.0
 	github.com/golang/protobuf v1.5.0
 	github.com/google/go-cmp v0.5.5
 	go.mongodb.org/mongo-driver v1.12.0
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
-	gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

go.sum

@@ -1,20 +1,65 @@
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