forked from moby/swarmkit
/
deepcopy.go
266 lines (221 loc) · 6.05 KB
/
deepcopy.go
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package deepcopy
import (
"github.com/docker/swarmkit/protobuf/plugin"
"github.com/gogo/protobuf/gogoproto"
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"github.com/gogo/protobuf/protoc-gen-gogo/generator"
)
type deepCopyGen struct {
*generator.Generator
generator.PluginImports
copyPkg generator.Single
}
func init() {
generator.RegisterPlugin(new(deepCopyGen))
}
func (d *deepCopyGen) Name() string {
return "deepcopy"
}
func (d *deepCopyGen) Init(g *generator.Generator) {
d.Generator = g
}
func (d *deepCopyGen) genCopyFunc(dst, src string) {
d.P(d.copyPkg.Use(), ".Copy(", dst, ", ", src, ")")
}
func (d *deepCopyGen) genMsgDeepCopy(m *generator.Descriptor) {
ccTypeName := generator.CamelCaseSlice(m.TypeName())
// Generate backwards compatible, type-safe Copy() function.
d.P("func (m *", ccTypeName, ") Copy() *", ccTypeName, "{")
d.In()
d.P("if m == nil {")
d.In()
d.P("return nil")
d.Out()
d.P("}")
d.P("o := &", ccTypeName, "{}")
d.P("o.CopyFrom(m)")
d.P("return o")
d.Out()
d.P("}")
d.P()
if len(m.Field) == 0 {
d.P("func (m *", ccTypeName, ") CopyFrom(src interface{})", " {}")
return
}
d.P("func (m *", ccTypeName, ") CopyFrom(src interface{})", " {")
d.P()
d.P("o := src.(*", ccTypeName, ")")
// shallow copy handles all scalars
d.P("*m = *o")
oneofByIndex := [][]*descriptor.FieldDescriptorProto{}
for _, f := range m.Field {
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
// Handle oneof type, we defer them to a loop below
if f.OneofIndex != nil {
if len(oneofByIndex) <= int(*f.OneofIndex) {
oneofByIndex = append(oneofByIndex, []*descriptor.FieldDescriptorProto{})
}
oneofByIndex[*f.OneofIndex] = append(oneofByIndex[*f.OneofIndex], f)
continue
}
// Handle all kinds of message type
if f.IsMessage() {
// Handle map type
if d.genMap(m, f) {
continue
}
// Handle any message which is not repeated or part of oneof
if !f.IsRepeated() && f.OneofIndex == nil {
if !gogoproto.IsNullable(f) {
d.genCopyFunc("&m."+fName, "&o."+fName)
} else {
d.P("if o.", fName, " != nil {")
d.In()
// allocate dst object
d.P("m.", fName, " = &", d.TypeName(d.ObjectNamed(f.GetTypeName())), "{}")
// copy into the allocated struct
d.genCopyFunc("m."+fName, "o."+fName)
d.Out()
d.P("}")
}
continue
}
}
// Handle repeated field
if f.IsRepeated() {
d.genRepeated(m, f)
continue
}
// skip: field was a scalar handled by shallow copy!
}
for i, oo := range m.GetOneofDecl() {
d.genOneOf(m, oo, oneofByIndex[i])
}
d.P("}")
d.P()
}
func (d *deepCopyGen) genMap(m *generator.Descriptor, f *descriptor.FieldDescriptorProto) bool {
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
dv := d.ObjectNamed(f.GetTypeName())
desc, ok := dv.(*generator.Descriptor)
if !ok || !desc.GetOptions().GetMapEntry() {
return false
}
mt := d.GoMapType(desc, f)
typename := mt.GoType
d.P("if o.", fName, " != nil {")
d.In()
d.P("m.", fName, " = make(", typename, ", ", "len(o.", fName, "))")
d.P("for k, v := range o.", fName, " {")
d.In()
if mt.ValueField.IsMessage() {
if !gogoproto.IsNullable(f) {
d.P("n := ", d.TypeName(d.ObjectNamed(mt.ValueField.GetTypeName())), "{}")
d.genCopyFunc("&n", "&v")
d.P("m.", fName, "[k] = ", "n")
} else {
d.P("m.", fName, "[k] = &", d.TypeName(d.ObjectNamed(mt.ValueField.GetTypeName())), "{}")
d.genCopyFunc("m."+fName+"[k]", "v")
}
} else {
d.P("m.", fName, "[k] = v")
}
d.Out()
d.P("}")
d.Out()
d.P("}")
d.P()
return true
}
func (d *deepCopyGen) genRepeated(m *generator.Descriptor, f *descriptor.FieldDescriptorProto) {
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
typename, _ := d.GoType(m, f)
d.P("if o.", fName, " != nil {")
d.In()
if f.IsMessage() {
d.P("m.", fName, " = make(", typename, ", len(o.", fName, "))")
// TODO(stevvooe): Handle custom type here?
goType := d.TypeName(d.ObjectNamed(f.GetTypeName())) // elides [] or *
d.P("for i := range m.", fName, " {")
d.In()
if !gogoproto.IsNullable(f) {
d.genCopyFunc("&m."+fName+"[i]", "&o."+fName+"[i]")
} else {
d.P("m.", fName, "[i] = &", goType, "{}")
d.genCopyFunc("m."+fName+"[i]", "o."+fName+"[i]")
}
d.Out()
d.P("}")
} else {
d.P("m.", fName, " = make(", typename, ", len(o.", fName, "))")
d.P("copy(m.", fName, ", ", "o.", fName, ")")
}
d.Out()
d.P("}")
d.P()
}
func (d *deepCopyGen) genOneOf(m *generator.Descriptor, oneof *descriptor.OneofDescriptorProto, fields []*descriptor.FieldDescriptorProto) {
oneOfName := generator.CamelCase(oneof.GetName())
d.P("if o.", oneOfName, " != nil {")
d.In()
d.P("switch o.", oneOfName, ".(type) {")
for _, f := range fields {
ccTypeName := generator.CamelCaseSlice(m.TypeName())
fName := generator.CamelCase(*f.Name)
if gogoproto.IsCustomName(f) {
fName = gogoproto.GetCustomName(f)
}
tName := ccTypeName + "_" + fName
d.P("case *", tName, ":")
d.In()
d.P("v := ", tName, " {")
d.In()
var rhs string
if f.IsMessage() {
goType := d.TypeName(d.ObjectNamed(f.GetTypeName())) // elides [] or *
rhs = "&" + goType + "{}"
} else {
rhs = "o.Get" + fName + "()"
}
d.P(fName, ": ", rhs, ",")
d.Out()
d.P("}")
if f.IsMessage() {
d.genCopyFunc("v."+fName, "o.Get"+fName+"()")
}
d.P("m.", oneOfName, " = &v")
d.Out()
}
d.Out()
d.P("}")
d.Out()
d.P("}")
d.P()
}
func (d *deepCopyGen) Generate(file *generator.FileDescriptor) {
d.PluginImports = generator.NewPluginImports(d.Generator)
// TODO(stevvooe): Ideally, this could be taken as a parameter to the
// deepcopy plugin to control the package import, but this is good enough,
// for now.
d.copyPkg = d.NewImport("github.com/docker/swarmkit/api/deepcopy")
d.P()
for _, m := range file.Messages() {
if m.DescriptorProto.GetOptions().GetMapEntry() {
continue
}
if !plugin.DeepcopyEnabled(m.Options) {
continue
}
d.genMsgDeepCopy(m)
}
d.P()
}