Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/k8s.io/apimachinery/pkg/conversion/converter.go b/vendor/k8s.io/apimachinery/pkg/conversion/converter.go
new file mode 100644
index 0000000..bc615dc
--- /dev/null
+++ b/vendor/k8s.io/apimachinery/pkg/conversion/converter.go
@@ -0,0 +1,898 @@
+/*
+Copyright 2014 The Kubernetes 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.
+*/
+
+package conversion
+
+import (
+ "fmt"
+ "reflect"
+)
+
+type typePair struct {
+ source reflect.Type
+ dest reflect.Type
+}
+
+type typeNamePair struct {
+ fieldType reflect.Type
+ fieldName string
+}
+
+// DebugLogger allows you to get debugging messages if necessary.
+type DebugLogger interface {
+ Logf(format string, args ...interface{})
+}
+
+type NameFunc func(t reflect.Type) string
+
+var DefaultNameFunc = func(t reflect.Type) string { return t.Name() }
+
+// ConversionFunc converts the object a into the object b, reusing arrays or objects
+// or pointers if necessary. It should return an error if the object cannot be converted
+// or if some data is invalid. If you do not wish a and b to share fields or nested
+// objects, you must copy a before calling this function.
+type ConversionFunc func(a, b interface{}, scope Scope) error
+
+// Converter knows how to convert one type to another.
+type Converter struct {
+ // Map from the conversion pair to a function which can
+ // do the conversion.
+ conversionFuncs ConversionFuncs
+ generatedConversionFuncs ConversionFuncs
+
+ // Set of conversions that should be treated as a no-op
+ ignoredConversions map[typePair]struct{}
+
+ // This is a map from a source field type and name, to a list of destination
+ // field type and name.
+ structFieldDests map[typeNamePair][]typeNamePair
+
+ // Allows for the opposite lookup of structFieldDests. So that SourceFromDest
+ // copy flag also works. So this is a map of destination field name, to potential
+ // source field name and type to look for.
+ structFieldSources map[typeNamePair][]typeNamePair
+
+ // Map from an input type to a function which can apply a key name mapping
+ inputFieldMappingFuncs map[reflect.Type]FieldMappingFunc
+
+ // Map from an input type to a set of default conversion flags.
+ inputDefaultFlags map[reflect.Type]FieldMatchingFlags
+
+ // If non-nil, will be called to print helpful debugging info. Quite verbose.
+ Debug DebugLogger
+
+ // nameFunc is called to retrieve the name of a type; this name is used for the
+ // purpose of deciding whether two types match or not (i.e., will we attempt to
+ // do a conversion). The default returns the go type name.
+ nameFunc func(t reflect.Type) string
+}
+
+// NewConverter creates a new Converter object.
+func NewConverter(nameFn NameFunc) *Converter {
+ c := &Converter{
+ conversionFuncs: NewConversionFuncs(),
+ generatedConversionFuncs: NewConversionFuncs(),
+ ignoredConversions: make(map[typePair]struct{}),
+ nameFunc: nameFn,
+ structFieldDests: make(map[typeNamePair][]typeNamePair),
+ structFieldSources: make(map[typeNamePair][]typeNamePair),
+
+ inputFieldMappingFuncs: make(map[reflect.Type]FieldMappingFunc),
+ inputDefaultFlags: make(map[reflect.Type]FieldMatchingFlags),
+ }
+ c.RegisterConversionFunc(Convert_Slice_byte_To_Slice_byte)
+ return c
+}
+
+// WithConversions returns a Converter that is a copy of c but with the additional
+// fns merged on top.
+func (c *Converter) WithConversions(fns ConversionFuncs) *Converter {
+ copied := *c
+ copied.conversionFuncs = c.conversionFuncs.Merge(fns)
+ return &copied
+}
+
+// DefaultMeta returns the conversion FieldMappingFunc and meta for a given type.
+func (c *Converter) DefaultMeta(t reflect.Type) (FieldMatchingFlags, *Meta) {
+ return c.inputDefaultFlags[t], &Meta{
+ KeyNameMapping: c.inputFieldMappingFuncs[t],
+ }
+}
+
+// Convert_Slice_byte_To_Slice_byte prevents recursing into every byte
+func Convert_Slice_byte_To_Slice_byte(in *[]byte, out *[]byte, s Scope) error {
+ if *in == nil {
+ *out = nil
+ return nil
+ }
+ *out = make([]byte, len(*in))
+ copy(*out, *in)
+ return nil
+}
+
+// Scope is passed to conversion funcs to allow them to continue an ongoing conversion.
+// If multiple converters exist in the system, Scope will allow you to use the correct one
+// from a conversion function--that is, the one your conversion function was called by.
+type Scope interface {
+ // Call Convert to convert sub-objects. Note that if you call it with your own exact
+ // parameters, you'll run out of stack space before anything useful happens.
+ Convert(src, dest interface{}, flags FieldMatchingFlags) error
+
+ // DefaultConvert performs the default conversion, without calling a conversion func
+ // on the current stack frame. This makes it safe to call from a conversion func.
+ DefaultConvert(src, dest interface{}, flags FieldMatchingFlags) error
+
+ // SrcTags and DestTags contain the struct tags that src and dest had, respectively.
+ // If the enclosing object was not a struct, then these will contain no tags, of course.
+ SrcTag() reflect.StructTag
+ DestTag() reflect.StructTag
+
+ // Flags returns the flags with which the conversion was started.
+ Flags() FieldMatchingFlags
+
+ // Meta returns any information originally passed to Convert.
+ Meta() *Meta
+}
+
+// FieldMappingFunc can convert an input field value into different values, depending on
+// the value of the source or destination struct tags.
+type FieldMappingFunc func(key string, sourceTag, destTag reflect.StructTag) (source string, dest string)
+
+func NewConversionFuncs() ConversionFuncs {
+ return ConversionFuncs{
+ fns: make(map[typePair]reflect.Value),
+ untyped: make(map[typePair]ConversionFunc),
+ }
+}
+
+type ConversionFuncs struct {
+ fns map[typePair]reflect.Value
+ untyped map[typePair]ConversionFunc
+}
+
+// Add adds the provided conversion functions to the lookup table - they must have the signature
+// `func(type1, type2, Scope) error`. Functions are added in the order passed and will override
+// previously registered pairs.
+func (c ConversionFuncs) Add(fns ...interface{}) error {
+ for _, fn := range fns {
+ fv := reflect.ValueOf(fn)
+ ft := fv.Type()
+ if err := verifyConversionFunctionSignature(ft); err != nil {
+ return err
+ }
+ c.fns[typePair{ft.In(0).Elem(), ft.In(1).Elem()}] = fv
+ }
+ return nil
+}
+
+// AddUntyped adds the provided conversion function to the lookup table for the types that are
+// supplied as a and b. a and b must be pointers or an error is returned. This method overwrites
+// previously defined functions.
+func (c ConversionFuncs) AddUntyped(a, b interface{}, fn ConversionFunc) error {
+ tA, tB := reflect.TypeOf(a), reflect.TypeOf(b)
+ if tA.Kind() != reflect.Ptr {
+ return fmt.Errorf("the type %T must be a pointer to register as an untyped conversion", a)
+ }
+ if tB.Kind() != reflect.Ptr {
+ return fmt.Errorf("the type %T must be a pointer to register as an untyped conversion", b)
+ }
+ c.untyped[typePair{tA, tB}] = fn
+ return nil
+}
+
+// Merge returns a new ConversionFuncs that contains all conversions from
+// both other and c, with other conversions taking precedence.
+func (c ConversionFuncs) Merge(other ConversionFuncs) ConversionFuncs {
+ merged := NewConversionFuncs()
+ for k, v := range c.fns {
+ merged.fns[k] = v
+ }
+ for k, v := range other.fns {
+ merged.fns[k] = v
+ }
+ for k, v := range c.untyped {
+ merged.untyped[k] = v
+ }
+ for k, v := range other.untyped {
+ merged.untyped[k] = v
+ }
+ return merged
+}
+
+// Meta is supplied by Scheme, when it calls Convert.
+type Meta struct {
+ // KeyNameMapping is an optional function which may map the listed key (field name)
+ // into a source and destination value.
+ KeyNameMapping FieldMappingFunc
+ // Context is an optional field that callers may use to pass info to conversion functions.
+ Context interface{}
+}
+
+// scope contains information about an ongoing conversion.
+type scope struct {
+ converter *Converter
+ meta *Meta
+ flags FieldMatchingFlags
+
+ // srcStack & destStack are separate because they may not have a 1:1
+ // relationship.
+ srcStack scopeStack
+ destStack scopeStack
+}
+
+type scopeStackElem struct {
+ tag reflect.StructTag
+ value reflect.Value
+ key string
+}
+
+type scopeStack []scopeStackElem
+
+func (s *scopeStack) pop() {
+ n := len(*s)
+ *s = (*s)[:n-1]
+}
+
+func (s *scopeStack) push(e scopeStackElem) {
+ *s = append(*s, e)
+}
+
+func (s *scopeStack) top() *scopeStackElem {
+ return &(*s)[len(*s)-1]
+}
+
+func (s scopeStack) describe() string {
+ desc := ""
+ if len(s) > 1 {
+ desc = "(" + s[1].value.Type().String() + ")"
+ }
+ for i, v := range s {
+ if i < 2 {
+ // First layer on stack is not real; second is handled specially above.
+ continue
+ }
+ if v.key == "" {
+ desc += fmt.Sprintf(".%v", v.value.Type())
+ } else {
+ desc += fmt.Sprintf(".%v", v.key)
+ }
+ }
+ return desc
+}
+
+// Formats src & dest as indices for printing.
+func (s *scope) setIndices(src, dest int) {
+ s.srcStack.top().key = fmt.Sprintf("[%v]", src)
+ s.destStack.top().key = fmt.Sprintf("[%v]", dest)
+}
+
+// Formats src & dest as map keys for printing.
+func (s *scope) setKeys(src, dest interface{}) {
+ s.srcStack.top().key = fmt.Sprintf(`["%v"]`, src)
+ s.destStack.top().key = fmt.Sprintf(`["%v"]`, dest)
+}
+
+// Convert continues a conversion.
+func (s *scope) Convert(src, dest interface{}, flags FieldMatchingFlags) error {
+ return s.converter.Convert(src, dest, flags, s.meta)
+}
+
+// DefaultConvert continues a conversion, performing a default conversion (no conversion func)
+// for the current stack frame.
+func (s *scope) DefaultConvert(src, dest interface{}, flags FieldMatchingFlags) error {
+ return s.converter.DefaultConvert(src, dest, flags, s.meta)
+}
+
+// SrcTag returns the tag of the struct containing the current source item, if any.
+func (s *scope) SrcTag() reflect.StructTag {
+ return s.srcStack.top().tag
+}
+
+// DestTag returns the tag of the struct containing the current dest item, if any.
+func (s *scope) DestTag() reflect.StructTag {
+ return s.destStack.top().tag
+}
+
+// Flags returns the flags with which the current conversion was started.
+func (s *scope) Flags() FieldMatchingFlags {
+ return s.flags
+}
+
+// Meta returns the meta object that was originally passed to Convert.
+func (s *scope) Meta() *Meta {
+ return s.meta
+}
+
+// describe prints the path to get to the current (source, dest) values.
+func (s *scope) describe() (src, dest string) {
+ return s.srcStack.describe(), s.destStack.describe()
+}
+
+// error makes an error that includes information about where we were in the objects
+// we were asked to convert.
+func (s *scope) errorf(message string, args ...interface{}) error {
+ srcPath, destPath := s.describe()
+ where := fmt.Sprintf("converting %v to %v: ", srcPath, destPath)
+ return fmt.Errorf(where+message, args...)
+}
+
+// Verifies whether a conversion function has a correct signature.
+func verifyConversionFunctionSignature(ft reflect.Type) error {
+ if ft.Kind() != reflect.Func {
+ return fmt.Errorf("expected func, got: %v", ft)
+ }
+ if ft.NumIn() != 3 {
+ return fmt.Errorf("expected three 'in' params, got: %v", ft)
+ }
+ if ft.NumOut() != 1 {
+ return fmt.Errorf("expected one 'out' param, got: %v", ft)
+ }
+ if ft.In(0).Kind() != reflect.Ptr {
+ return fmt.Errorf("expected pointer arg for 'in' param 0, got: %v", ft)
+ }
+ if ft.In(1).Kind() != reflect.Ptr {
+ return fmt.Errorf("expected pointer arg for 'in' param 1, got: %v", ft)
+ }
+ scopeType := Scope(nil)
+ if e, a := reflect.TypeOf(&scopeType).Elem(), ft.In(2); e != a {
+ return fmt.Errorf("expected '%v' arg for 'in' param 2, got '%v' (%v)", e, a, ft)
+ }
+ var forErrorType error
+ // This convolution is necessary, otherwise TypeOf picks up on the fact
+ // that forErrorType is nil.
+ errorType := reflect.TypeOf(&forErrorType).Elem()
+ if ft.Out(0) != errorType {
+ return fmt.Errorf("expected error return, got: %v", ft)
+ }
+ return nil
+}
+
+// RegisterConversionFunc registers a conversion func with the
+// Converter. conversionFunc must take three parameters: a pointer to the input
+// type, a pointer to the output type, and a conversion.Scope (which should be
+// used if recursive conversion calls are desired). It must return an error.
+//
+// Example:
+// c.RegisterConversionFunc(
+// func(in *Pod, out *v1.Pod, s Scope) error {
+// // conversion logic...
+// return nil
+// })
+// DEPRECATED: Will be removed in favor of RegisterUntypedConversionFunc
+func (c *Converter) RegisterConversionFunc(conversionFunc interface{}) error {
+ return c.conversionFuncs.Add(conversionFunc)
+}
+
+// Similar to RegisterConversionFunc, but registers conversion function that were
+// automatically generated.
+// DEPRECATED: Will be removed in favor of RegisterGeneratedUntypedConversionFunc
+func (c *Converter) RegisterGeneratedConversionFunc(conversionFunc interface{}) error {
+ return c.generatedConversionFuncs.Add(conversionFunc)
+}
+
+// RegisterUntypedConversionFunc registers a function that converts between a and b by passing objects of those
+// types to the provided function. The function *must* accept objects of a and b - this machinery will not enforce
+// any other guarantee.
+func (c *Converter) RegisterUntypedConversionFunc(a, b interface{}, fn ConversionFunc) error {
+ return c.conversionFuncs.AddUntyped(a, b, fn)
+}
+
+// RegisterGeneratedUntypedConversionFunc registers a function that converts between a and b by passing objects of those
+// types to the provided function. The function *must* accept objects of a and b - this machinery will not enforce
+// any other guarantee.
+func (c *Converter) RegisterGeneratedUntypedConversionFunc(a, b interface{}, fn ConversionFunc) error {
+ return c.generatedConversionFuncs.AddUntyped(a, b, fn)
+}
+
+// RegisterIgnoredConversion registers a "no-op" for conversion, where any requested
+// conversion between from and to is ignored.
+func (c *Converter) RegisterIgnoredConversion(from, to interface{}) error {
+ typeFrom := reflect.TypeOf(from)
+ typeTo := reflect.TypeOf(to)
+ if reflect.TypeOf(from).Kind() != reflect.Ptr {
+ return fmt.Errorf("expected pointer arg for 'from' param 0, got: %v", typeFrom)
+ }
+ if typeTo.Kind() != reflect.Ptr {
+ return fmt.Errorf("expected pointer arg for 'to' param 1, got: %v", typeTo)
+ }
+ c.ignoredConversions[typePair{typeFrom.Elem(), typeTo.Elem()}] = struct{}{}
+ return nil
+}
+
+// RegisterInputDefaults registers a field name mapping function, used when converting
+// from maps to structs. Inputs to the conversion methods are checked for this type and a mapping
+// applied automatically if the input matches in. A set of default flags for the input conversion
+// may also be provided, which will be used when no explicit flags are requested.
+func (c *Converter) RegisterInputDefaults(in interface{}, fn FieldMappingFunc, defaultFlags FieldMatchingFlags) error {
+ fv := reflect.ValueOf(in)
+ ft := fv.Type()
+ if ft.Kind() != reflect.Ptr {
+ return fmt.Errorf("expected pointer 'in' argument, got: %v", ft)
+ }
+ c.inputFieldMappingFuncs[ft] = fn
+ c.inputDefaultFlags[ft] = defaultFlags
+ return nil
+}
+
+// FieldMatchingFlags contains a list of ways in which struct fields could be
+// copied. These constants may be | combined.
+type FieldMatchingFlags int
+
+const (
+ // Loop through destination fields, search for matching source
+ // field to copy it from. Source fields with no corresponding
+ // destination field will be ignored. If SourceToDest is
+ // specified, this flag is ignored. If neither is specified,
+ // or no flags are passed, this flag is the default.
+ DestFromSource FieldMatchingFlags = 0
+ // Loop through source fields, search for matching dest field
+ // to copy it into. Destination fields with no corresponding
+ // source field will be ignored.
+ SourceToDest FieldMatchingFlags = 1 << iota
+ // Don't treat it as an error if the corresponding source or
+ // dest field can't be found.
+ IgnoreMissingFields
+ // Don't require type names to match.
+ AllowDifferentFieldTypeNames
+)
+
+// IsSet returns true if the given flag or combination of flags is set.
+func (f FieldMatchingFlags) IsSet(flag FieldMatchingFlags) bool {
+ if flag == DestFromSource {
+ // The bit logic doesn't work on the default value.
+ return f&SourceToDest != SourceToDest
+ }
+ return f&flag == flag
+}
+
+// Convert will translate src to dest if it knows how. Both must be pointers.
+// If no conversion func is registered and the default copying mechanism
+// doesn't work on this type pair, an error will be returned.
+// Read the comments on the various FieldMatchingFlags constants to understand
+// what the 'flags' parameter does.
+// 'meta' is given to allow you to pass information to conversion functions,
+// it is not used by Convert() other than storing it in the scope.
+// Not safe for objects with cyclic references!
+func (c *Converter) Convert(src, dest interface{}, flags FieldMatchingFlags, meta *Meta) error {
+ return c.doConversion(src, dest, flags, meta, c.convert)
+}
+
+// DefaultConvert will translate src to dest if it knows how. Both must be pointers.
+// No conversion func is used. If the default copying mechanism
+// doesn't work on this type pair, an error will be returned.
+// Read the comments on the various FieldMatchingFlags constants to understand
+// what the 'flags' parameter does.
+// 'meta' is given to allow you to pass information to conversion functions,
+// it is not used by DefaultConvert() other than storing it in the scope.
+// Not safe for objects with cyclic references!
+func (c *Converter) DefaultConvert(src, dest interface{}, flags FieldMatchingFlags, meta *Meta) error {
+ return c.doConversion(src, dest, flags, meta, c.defaultConvert)
+}
+
+type conversionFunc func(sv, dv reflect.Value, scope *scope) error
+
+func (c *Converter) doConversion(src, dest interface{}, flags FieldMatchingFlags, meta *Meta, f conversionFunc) error {
+ pair := typePair{reflect.TypeOf(src), reflect.TypeOf(dest)}
+ scope := &scope{
+ converter: c,
+ flags: flags,
+ meta: meta,
+ }
+ if fn, ok := c.conversionFuncs.untyped[pair]; ok {
+ return fn(src, dest, scope)
+ }
+ if fn, ok := c.generatedConversionFuncs.untyped[pair]; ok {
+ return fn(src, dest, scope)
+ }
+ // TODO: consider everything past this point deprecated - we want to support only point to point top level
+ // conversions
+
+ dv, err := EnforcePtr(dest)
+ if err != nil {
+ return err
+ }
+ if !dv.CanAddr() && !dv.CanSet() {
+ return fmt.Errorf("can't write to dest")
+ }
+ sv, err := EnforcePtr(src)
+ if err != nil {
+ return err
+ }
+ // Leave something on the stack, so that calls to struct tag getters never fail.
+ scope.srcStack.push(scopeStackElem{})
+ scope.destStack.push(scopeStackElem{})
+ return f(sv, dv, scope)
+}
+
+// callCustom calls 'custom' with sv & dv. custom must be a conversion function.
+func (c *Converter) callCustom(sv, dv, custom reflect.Value, scope *scope) error {
+ if !sv.CanAddr() {
+ sv2 := reflect.New(sv.Type())
+ sv2.Elem().Set(sv)
+ sv = sv2
+ } else {
+ sv = sv.Addr()
+ }
+ if !dv.CanAddr() {
+ if !dv.CanSet() {
+ return scope.errorf("can't addr or set dest.")
+ }
+ dvOrig := dv
+ dv := reflect.New(dvOrig.Type())
+ defer func() { dvOrig.Set(dv) }()
+ } else {
+ dv = dv.Addr()
+ }
+ args := []reflect.Value{sv, dv, reflect.ValueOf(scope)}
+ ret := custom.Call(args)[0].Interface()
+ // This convolution is necessary because nil interfaces won't convert
+ // to errors.
+ if ret == nil {
+ return nil
+ }
+ return ret.(error)
+}
+
+// convert recursively copies sv into dv, calling an appropriate conversion function if
+// one is registered.
+func (c *Converter) convert(sv, dv reflect.Value, scope *scope) error {
+ dt, st := dv.Type(), sv.Type()
+ pair := typePair{st, dt}
+
+ // ignore conversions of this type
+ if _, ok := c.ignoredConversions[pair]; ok {
+ if c.Debug != nil {
+ c.Debug.Logf("Ignoring conversion of '%v' to '%v'", st, dt)
+ }
+ return nil
+ }
+
+ // Convert sv to dv.
+ if fv, ok := c.conversionFuncs.fns[pair]; ok {
+ if c.Debug != nil {
+ c.Debug.Logf("Calling custom conversion of '%v' to '%v'", st, dt)
+ }
+ return c.callCustom(sv, dv, fv, scope)
+ }
+ if fv, ok := c.generatedConversionFuncs.fns[pair]; ok {
+ if c.Debug != nil {
+ c.Debug.Logf("Calling generated conversion of '%v' to '%v'", st, dt)
+ }
+ return c.callCustom(sv, dv, fv, scope)
+ }
+
+ return c.defaultConvert(sv, dv, scope)
+}
+
+// defaultConvert recursively copies sv into dv. no conversion function is called
+// for the current stack frame (but conversion functions may be called for nested objects)
+func (c *Converter) defaultConvert(sv, dv reflect.Value, scope *scope) error {
+ dt, st := dv.Type(), sv.Type()
+
+ if !dv.CanSet() {
+ return scope.errorf("Cannot set dest. (Tried to deep copy something with unexported fields?)")
+ }
+
+ if !scope.flags.IsSet(AllowDifferentFieldTypeNames) && c.nameFunc(dt) != c.nameFunc(st) {
+ return scope.errorf(
+ "type names don't match (%v, %v), and no conversion 'func (%v, %v) error' registered.",
+ c.nameFunc(st), c.nameFunc(dt), st, dt)
+ }
+
+ switch st.Kind() {
+ case reflect.Map, reflect.Ptr, reflect.Slice, reflect.Interface, reflect.Struct:
+ // Don't copy these via assignment/conversion!
+ default:
+ // This should handle all simple types.
+ if st.AssignableTo(dt) {
+ dv.Set(sv)
+ return nil
+ }
+ if st.ConvertibleTo(dt) {
+ dv.Set(sv.Convert(dt))
+ return nil
+ }
+ }
+
+ if c.Debug != nil {
+ c.Debug.Logf("Trying to convert '%v' to '%v'", st, dt)
+ }
+
+ scope.srcStack.push(scopeStackElem{value: sv})
+ scope.destStack.push(scopeStackElem{value: dv})
+ defer scope.srcStack.pop()
+ defer scope.destStack.pop()
+
+ switch dv.Kind() {
+ case reflect.Struct:
+ return c.convertKV(toKVValue(sv), toKVValue(dv), scope)
+ case reflect.Slice:
+ if sv.IsNil() {
+ // Don't make a zero-length slice.
+ dv.Set(reflect.Zero(dt))
+ return nil
+ }
+ dv.Set(reflect.MakeSlice(dt, sv.Len(), sv.Cap()))
+ for i := 0; i < sv.Len(); i++ {
+ scope.setIndices(i, i)
+ if err := c.convert(sv.Index(i), dv.Index(i), scope); err != nil {
+ return err
+ }
+ }
+ case reflect.Ptr:
+ if sv.IsNil() {
+ // Don't copy a nil ptr!
+ dv.Set(reflect.Zero(dt))
+ return nil
+ }
+ dv.Set(reflect.New(dt.Elem()))
+ switch st.Kind() {
+ case reflect.Ptr, reflect.Interface:
+ return c.convert(sv.Elem(), dv.Elem(), scope)
+ default:
+ return c.convert(sv, dv.Elem(), scope)
+ }
+ case reflect.Map:
+ if sv.IsNil() {
+ // Don't copy a nil ptr!
+ dv.Set(reflect.Zero(dt))
+ return nil
+ }
+ dv.Set(reflect.MakeMap(dt))
+ for _, sk := range sv.MapKeys() {
+ dk := reflect.New(dt.Key()).Elem()
+ if err := c.convert(sk, dk, scope); err != nil {
+ return err
+ }
+ dkv := reflect.New(dt.Elem()).Elem()
+ scope.setKeys(sk.Interface(), dk.Interface())
+ // TODO: sv.MapIndex(sk) may return a value with CanAddr() == false,
+ // because a map[string]struct{} does not allow a pointer reference.
+ // Calling a custom conversion function defined for the map value
+ // will panic. Example is PodInfo map[string]ContainerStatus.
+ if err := c.convert(sv.MapIndex(sk), dkv, scope); err != nil {
+ return err
+ }
+ dv.SetMapIndex(dk, dkv)
+ }
+ case reflect.Interface:
+ if sv.IsNil() {
+ // Don't copy a nil interface!
+ dv.Set(reflect.Zero(dt))
+ return nil
+ }
+ tmpdv := reflect.New(sv.Elem().Type()).Elem()
+ if err := c.convert(sv.Elem(), tmpdv, scope); err != nil {
+ return err
+ }
+ dv.Set(reflect.ValueOf(tmpdv.Interface()))
+ return nil
+ default:
+ return scope.errorf("couldn't copy '%v' into '%v'; didn't understand types", st, dt)
+ }
+ return nil
+}
+
+var stringType = reflect.TypeOf("")
+
+func toKVValue(v reflect.Value) kvValue {
+ switch v.Kind() {
+ case reflect.Struct:
+ return structAdaptor(v)
+ case reflect.Map:
+ if v.Type().Key().AssignableTo(stringType) {
+ return stringMapAdaptor(v)
+ }
+ }
+
+ return nil
+}
+
+// kvValue lets us write the same conversion logic to work with both maps
+// and structs. Only maps with string keys make sense for this.
+type kvValue interface {
+ // returns all keys, as a []string.
+ keys() []string
+ // Will just return "" for maps.
+ tagOf(key string) reflect.StructTag
+ // Will return the zero Value if the key doesn't exist.
+ value(key string) reflect.Value
+ // Maps require explicit setting-- will do nothing for structs.
+ // Returns false on failure.
+ confirmSet(key string, v reflect.Value) bool
+}
+
+type stringMapAdaptor reflect.Value
+
+func (a stringMapAdaptor) len() int {
+ return reflect.Value(a).Len()
+}
+
+func (a stringMapAdaptor) keys() []string {
+ v := reflect.Value(a)
+ keys := make([]string, v.Len())
+ for i, v := range v.MapKeys() {
+ if v.IsNil() {
+ continue
+ }
+ switch t := v.Interface().(type) {
+ case string:
+ keys[i] = t
+ }
+ }
+ return keys
+}
+
+func (a stringMapAdaptor) tagOf(key string) reflect.StructTag {
+ return ""
+}
+
+func (a stringMapAdaptor) value(key string) reflect.Value {
+ return reflect.Value(a).MapIndex(reflect.ValueOf(key))
+}
+
+func (a stringMapAdaptor) confirmSet(key string, v reflect.Value) bool {
+ return true
+}
+
+type structAdaptor reflect.Value
+
+func (a structAdaptor) len() int {
+ v := reflect.Value(a)
+ return v.Type().NumField()
+}
+
+func (a structAdaptor) keys() []string {
+ v := reflect.Value(a)
+ t := v.Type()
+ keys := make([]string, t.NumField())
+ for i := range keys {
+ keys[i] = t.Field(i).Name
+ }
+ return keys
+}
+
+func (a structAdaptor) tagOf(key string) reflect.StructTag {
+ v := reflect.Value(a)
+ field, ok := v.Type().FieldByName(key)
+ if ok {
+ return field.Tag
+ }
+ return ""
+}
+
+func (a structAdaptor) value(key string) reflect.Value {
+ v := reflect.Value(a)
+ return v.FieldByName(key)
+}
+
+func (a structAdaptor) confirmSet(key string, v reflect.Value) bool {
+ return true
+}
+
+// convertKV can convert things that consist of key/value pairs, like structs
+// and some maps.
+func (c *Converter) convertKV(skv, dkv kvValue, scope *scope) error {
+ if skv == nil || dkv == nil {
+ // TODO: add keys to stack to support really understandable error messages.
+ return fmt.Errorf("Unable to convert %#v to %#v", skv, dkv)
+ }
+
+ lister := dkv
+ if scope.flags.IsSet(SourceToDest) {
+ lister = skv
+ }
+
+ var mapping FieldMappingFunc
+ if scope.meta != nil && scope.meta.KeyNameMapping != nil {
+ mapping = scope.meta.KeyNameMapping
+ }
+
+ for _, key := range lister.keys() {
+ if found, err := c.checkField(key, skv, dkv, scope); found {
+ if err != nil {
+ return err
+ }
+ continue
+ }
+ stag := skv.tagOf(key)
+ dtag := dkv.tagOf(key)
+ skey := key
+ dkey := key
+ if mapping != nil {
+ skey, dkey = scope.meta.KeyNameMapping(key, stag, dtag)
+ }
+
+ df := dkv.value(dkey)
+ sf := skv.value(skey)
+ if !df.IsValid() || !sf.IsValid() {
+ switch {
+ case scope.flags.IsSet(IgnoreMissingFields):
+ // No error.
+ case scope.flags.IsSet(SourceToDest):
+ return scope.errorf("%v not present in dest", dkey)
+ default:
+ return scope.errorf("%v not present in src", skey)
+ }
+ continue
+ }
+ scope.srcStack.top().key = skey
+ scope.srcStack.top().tag = stag
+ scope.destStack.top().key = dkey
+ scope.destStack.top().tag = dtag
+ if err := c.convert(sf, df, scope); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// checkField returns true if the field name matches any of the struct
+// field copying rules. The error should be ignored if it returns false.
+func (c *Converter) checkField(fieldName string, skv, dkv kvValue, scope *scope) (bool, error) {
+ replacementMade := false
+ if scope.flags.IsSet(DestFromSource) {
+ df := dkv.value(fieldName)
+ if !df.IsValid() {
+ return false, nil
+ }
+ destKey := typeNamePair{df.Type(), fieldName}
+ // Check each of the potential source (type, name) pairs to see if they're
+ // present in sv.
+ for _, potentialSourceKey := range c.structFieldSources[destKey] {
+ sf := skv.value(potentialSourceKey.fieldName)
+ if !sf.IsValid() {
+ continue
+ }
+ if sf.Type() == potentialSourceKey.fieldType {
+ // Both the source's name and type matched, so copy.
+ scope.srcStack.top().key = potentialSourceKey.fieldName
+ scope.destStack.top().key = fieldName
+ if err := c.convert(sf, df, scope); err != nil {
+ return true, err
+ }
+ dkv.confirmSet(fieldName, df)
+ replacementMade = true
+ }
+ }
+ return replacementMade, nil
+ }
+
+ sf := skv.value(fieldName)
+ if !sf.IsValid() {
+ return false, nil
+ }
+ srcKey := typeNamePair{sf.Type(), fieldName}
+ // Check each of the potential dest (type, name) pairs to see if they're
+ // present in dv.
+ for _, potentialDestKey := range c.structFieldDests[srcKey] {
+ df := dkv.value(potentialDestKey.fieldName)
+ if !df.IsValid() {
+ continue
+ }
+ if df.Type() == potentialDestKey.fieldType {
+ // Both the dest's name and type matched, so copy.
+ scope.srcStack.top().key = fieldName
+ scope.destStack.top().key = potentialDestKey.fieldName
+ if err := c.convert(sf, df, scope); err != nil {
+ return true, err
+ }
+ dkv.confirmSet(potentialDestKey.fieldName, df)
+ replacementMade = true
+ }
+ }
+ return replacementMade, nil
+}