mirror of https://github.com/kubernetes/kops.git
122 lines
2.9 KiB
Go
122 lines
2.9 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package reflectutils
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import (
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"bytes"
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"fmt"
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"reflect"
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"k8s.io/klog/v2"
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"k8s.io/kops/pkg/values"
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)
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// Printer is a custom printer function, so we can add special display for objects
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// (without introducing a package dependency)
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type Printer func(o interface{}) (string, bool)
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var printers []Printer
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// RegisterPrinter adds a custom printer function
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func RegisterPrinter(p Printer) {
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printers = append(printers, p)
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}
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// ValueAsString returns a human-readable string representation of the passed value
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func ValueAsString(value reflect.Value) string {
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b := &bytes.Buffer{}
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walker := func(path *FieldPath, field *reflect.StructField, v reflect.Value) error {
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if IsPrimitiveValue(v) || v.Kind() == reflect.String {
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fmt.Fprintf(b, "%v", v.Interface())
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return SkipReflection
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}
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switch v.Kind() {
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case reflect.Ptr, reflect.Interface, reflect.Slice, reflect.Map:
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if v.IsNil() {
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fmt.Fprintf(b, "<nil>")
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return SkipReflection
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}
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}
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switch v.Kind() {
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case reflect.Ptr, reflect.Interface:
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return nil // descend into value
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case reflect.Slice:
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len := v.Len()
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fmt.Fprintf(b, "[")
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for i := 0; i < len; i++ {
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av := v.Index(i)
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if i != 0 {
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fmt.Fprintf(b, ", ")
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}
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fmt.Fprintf(b, "%s", ValueAsString(av))
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}
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fmt.Fprintf(b, "]")
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return SkipReflection
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case reflect.Map:
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keys := v.MapKeys()
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fmt.Fprintf(b, "{")
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for i, key := range keys {
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mv := v.MapIndex(key)
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if i != 0 {
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fmt.Fprintf(b, ", ")
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}
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fmt.Fprintf(b, "%s: %s", ValueAsString(key), ValueAsString(mv))
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}
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fmt.Fprintf(b, "}")
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return SkipReflection
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case reflect.Struct:
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intf := v.Addr().Interface()
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done := false
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for _, p := range printers {
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s, ok := p(intf)
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if ok {
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fmt.Fprintf(b, "%s", s)
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done = true
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break
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}
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}
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if !done {
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klog.V(4).Infof("Unhandled kind in asString for %q: %T", path, v.Interface())
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fmt.Fprint(b, values.DebugAsJSONString(intf))
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}
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return SkipReflection
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default:
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klog.Infof("Unhandled kind in asString for %q: %T", path, v.Interface())
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return fmt.Errorf("Unhandled kind for %q: %v", path, v.Kind())
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}
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}
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err := ReflectRecursive(value, walker, &ReflectOptions{DeprecatedDoubleVisit: true})
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if err != nil {
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klog.Fatalf("unexpected error during reflective walk: %v", err)
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}
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return b.String()
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}
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