223 lines
6.4 KiB
Go
223 lines
6.4 KiB
Go
package runtime
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import (
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"fmt"
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"net/url"
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"reflect"
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"strconv"
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"strings"
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"time"
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"github.com/golang/protobuf/proto"
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"github.com/grpc-ecosystem/grpc-gateway/utilities"
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"google.golang.org/grpc/grpclog"
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)
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// PopulateQueryParameters populates "values" into "msg".
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// A value is ignored if its key starts with one of the elements in "filter".
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func PopulateQueryParameters(msg proto.Message, values url.Values, filter *utilities.DoubleArray) error {
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for key, values := range values {
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fieldPath := strings.Split(key, ".")
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if filter.HasCommonPrefix(fieldPath) {
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continue
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}
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if err := populateFieldValueFromPath(msg, fieldPath, values); err != nil {
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return err
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}
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}
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return nil
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}
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// PopulateFieldFromPath sets a value in a nested Protobuf structure.
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// It instantiates missing protobuf fields as it goes.
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func PopulateFieldFromPath(msg proto.Message, fieldPathString string, value string) error {
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fieldPath := strings.Split(fieldPathString, ".")
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return populateFieldValueFromPath(msg, fieldPath, []string{value})
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}
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func populateFieldValueFromPath(msg proto.Message, fieldPath []string, values []string) error {
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m := reflect.ValueOf(msg)
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if m.Kind() != reflect.Ptr {
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return fmt.Errorf("unexpected type %T: %v", msg, msg)
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}
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var props *proto.Properties
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m = m.Elem()
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for i, fieldName := range fieldPath {
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isLast := i == len(fieldPath)-1
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if !isLast && m.Kind() != reflect.Struct {
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return fmt.Errorf("non-aggregate type in the mid of path: %s", strings.Join(fieldPath, "."))
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}
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var f reflect.Value
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f, props = fieldByProtoName(m, fieldName)
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if !f.IsValid() {
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grpclog.Printf("field not found in %T: %s", msg, strings.Join(fieldPath, "."))
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return nil
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}
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switch f.Kind() {
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case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64, reflect.String, reflect.Uint32, reflect.Uint64:
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if !isLast {
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return fmt.Errorf("unexpected nested field %s in %s", fieldPath[i+1], strings.Join(fieldPath[:i+1], "."))
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}
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m = f
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case reflect.Slice:
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// TODO(yugui) Support []byte
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if !isLast {
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return fmt.Errorf("unexpected repeated field in %s", strings.Join(fieldPath, "."))
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}
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return populateRepeatedField(f, values, props)
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case reflect.Ptr:
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if f.IsNil() {
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m = reflect.New(f.Type().Elem())
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f.Set(m.Convert(f.Type()))
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}
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m = f.Elem()
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continue
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case reflect.Struct:
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m = f
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continue
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default:
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return fmt.Errorf("unexpected type %s in %T", f.Type(), msg)
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}
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}
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switch len(values) {
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case 0:
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return fmt.Errorf("no value of field: %s", strings.Join(fieldPath, "."))
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case 1:
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default:
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grpclog.Printf("too many field values: %s", strings.Join(fieldPath, "."))
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}
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return populateField(m, values[0], props)
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}
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// fieldByProtoName looks up a field whose corresponding protobuf field name is "name".
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// "m" must be a struct value. It returns zero reflect.Value if no such field found.
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func fieldByProtoName(m reflect.Value, name string) (reflect.Value, *proto.Properties) {
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props := proto.GetProperties(m.Type())
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for _, p := range props.Prop {
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if p.OrigName == name {
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return m.FieldByName(p.Name), p
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}
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}
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return reflect.Value{}, nil
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}
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func populateRepeatedField(f reflect.Value, values []string, props *proto.Properties) error {
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elemType := f.Type().Elem()
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// is the destination field a slice of an enumeration type?
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if enumValMap := proto.EnumValueMap(props.Enum); enumValMap != nil {
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return populateFieldEnumRepeated(f, values, enumValMap)
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}
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conv, ok := convFromType[elemType.Kind()]
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if !ok {
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return fmt.Errorf("unsupported field type %s", elemType)
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}
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f.Set(reflect.MakeSlice(f.Type(), len(values), len(values)).Convert(f.Type()))
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for i, v := range values {
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result := conv.Call([]reflect.Value{reflect.ValueOf(v)})
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if err := result[1].Interface(); err != nil {
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return err.(error)
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}
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f.Index(i).Set(result[0].Convert(f.Index(i).Type()))
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}
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return nil
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}
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func populateField(f reflect.Value, value string, props *proto.Properties) error {
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// Handle well known type
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type wkt interface {
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XXX_WellKnownType() string
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}
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if wkt, ok := f.Addr().Interface().(wkt); ok {
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switch wkt.XXX_WellKnownType() {
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case "Timestamp":
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if value == "null" {
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f.Field(0).SetInt(0)
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f.Field(1).SetInt(0)
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return nil
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}
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t, err := time.Parse(time.RFC3339Nano, value)
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if err != nil {
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return fmt.Errorf("bad Timestamp: %v", err)
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}
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f.Field(0).SetInt(int64(t.Unix()))
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f.Field(1).SetInt(int64(t.Nanosecond()))
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return nil
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}
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}
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// is the destination field an enumeration type?
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if enumValMap := proto.EnumValueMap(props.Enum); enumValMap != nil {
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return populateFieldEnum(f, value, enumValMap)
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}
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conv, ok := convFromType[f.Kind()]
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if !ok {
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return fmt.Errorf("unsupported field type %T", f)
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}
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result := conv.Call([]reflect.Value{reflect.ValueOf(value)})
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if err := result[1].Interface(); err != nil {
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return err.(error)
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}
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f.Set(result[0].Convert(f.Type()))
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return nil
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}
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func convertEnum(value string, t reflect.Type, enumValMap map[string]int32) (reflect.Value, error) {
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// see if it's an enumeration string
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if enumVal, ok := enumValMap[value]; ok {
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return reflect.ValueOf(enumVal).Convert(t), nil
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}
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// check for an integer that matches an enumeration value
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eVal, err := strconv.Atoi(value)
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if err != nil {
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return reflect.Value{}, fmt.Errorf("%s is not a valid %s", value, t)
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}
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for _, v := range enumValMap {
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if v == int32(eVal) {
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return reflect.ValueOf(eVal).Convert(t), nil
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}
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}
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return reflect.Value{}, fmt.Errorf("%s is not a valid %s", value, t)
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}
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func populateFieldEnum(f reflect.Value, value string, enumValMap map[string]int32) error {
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cval, err := convertEnum(value, f.Type(), enumValMap)
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if err != nil {
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return err
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}
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f.Set(cval)
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return nil
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}
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func populateFieldEnumRepeated(f reflect.Value, values []string, enumValMap map[string]int32) error {
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elemType := f.Type().Elem()
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f.Set(reflect.MakeSlice(f.Type(), len(values), len(values)).Convert(f.Type()))
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for i, v := range values {
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result, err := convertEnum(v, elemType, enumValMap)
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if err != nil {
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return err
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}
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f.Index(i).Set(result)
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}
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return nil
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}
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var (
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convFromType = map[reflect.Kind]reflect.Value{
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reflect.String: reflect.ValueOf(String),
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reflect.Bool: reflect.ValueOf(Bool),
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reflect.Float64: reflect.ValueOf(Float64),
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reflect.Float32: reflect.ValueOf(Float32),
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reflect.Int64: reflect.ValueOf(Int64),
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reflect.Int32: reflect.ValueOf(Int32),
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reflect.Uint64: reflect.ValueOf(Uint64),
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reflect.Uint32: reflect.ValueOf(Uint32),
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// TODO(yugui) Support []byte
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}
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)
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