From 886f6f54bba52ca2b5bc93bfd7de655d7d31ce53 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Sat, 8 Sep 2018 11:22:31 +0200 Subject: switch to go.mod --- vendor/github.com/golang/protobuf/proto/clone.go | 46 ++++++++++++++++++------ 1 file changed, 35 insertions(+), 11 deletions(-) (limited to 'vendor/github.com/golang/protobuf/proto/clone.go') diff --git a/vendor/github.com/golang/protobuf/proto/clone.go b/vendor/github.com/golang/protobuf/proto/clone.go index e392575..3cd3249 100644 --- a/vendor/github.com/golang/protobuf/proto/clone.go +++ b/vendor/github.com/golang/protobuf/proto/clone.go @@ -35,22 +35,39 @@ package proto import ( + "fmt" "log" "reflect" "strings" ) // Clone returns a deep copy of a protocol buffer. -func Clone(pb Message) Message { - in := reflect.ValueOf(pb) +func Clone(src Message) Message { + in := reflect.ValueOf(src) if in.IsNil() { - return pb + return src } - out := reflect.New(in.Type().Elem()) - // out is empty so a merge is a deep copy. - mergeStruct(out.Elem(), in.Elem()) - return out.Interface().(Message) + dst := out.Interface().(Message) + Merge(dst, src) + return dst +} + +// Merger is the interface representing objects that can merge messages of the same type. +type Merger interface { + // Merge merges src into this message. + // Required and optional fields that are set in src will be set to that value in dst. + // Elements of repeated fields will be appended. + // + // Merge may panic if called with a different argument type than the receiver. + Merge(src Message) +} + +// generatedMerger is the custom merge method that generated protos will have. +// We must add this method since a generate Merge method will conflict with +// many existing protos that have a Merge data field already defined. +type generatedMerger interface { + XXX_Merge(src Message) } // Merge merges src into dst. @@ -58,17 +75,24 @@ func Clone(pb Message) Message { // Elements of repeated fields will be appended. // Merge panics if src and dst are not the same type, or if dst is nil. func Merge(dst, src Message) { + if m, ok := dst.(Merger); ok { + m.Merge(src) + return + } + in := reflect.ValueOf(src) out := reflect.ValueOf(dst) if out.IsNil() { panic("proto: nil destination") } if in.Type() != out.Type() { - // Explicit test prior to mergeStruct so that mistyped nils will fail - panic("proto: type mismatch") + panic(fmt.Sprintf("proto.Merge(%T, %T) type mismatch", dst, src)) } if in.IsNil() { - // Merging nil into non-nil is a quiet no-op + return // Merge from nil src is a noop + } + if m, ok := dst.(generatedMerger); ok { + m.XXX_Merge(src) return } mergeStruct(out.Elem(), in.Elem()) @@ -84,7 +108,7 @@ func mergeStruct(out, in reflect.Value) { mergeAny(out.Field(i), in.Field(i), false, sprop.Prop[i]) } - if emIn, ok := extendable(in.Addr().Interface()); ok { + if emIn, err := extendable(in.Addr().Interface()); err == nil { emOut, _ := extendable(out.Addr().Interface()) mIn, muIn := emIn.extensionsRead() if mIn != nil { -- cgit v1.2.3