80 lines
1.5 KiB
Go
80 lines
1.5 KiB
Go
package librato
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import (
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"bytes"
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"fmt"
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"io"
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"reflect"
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)
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// Stringify attempts to create a reasonable string representation of types in
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// the Librato library. It does things like resolve pointers to their values
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// and omits struct fields with nil values.
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func Stringify(message interface{}) string {
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var buf bytes.Buffer
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v := reflect.ValueOf(message)
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stringifyValue(&buf, v)
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return buf.String()
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}
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// stringifyValue was heavily inspired by the goprotobuf library.
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func stringifyValue(w io.Writer, val reflect.Value) {
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if val.Kind() == reflect.Ptr && val.IsNil() {
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w.Write([]byte("<nil>"))
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return
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}
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v := reflect.Indirect(val)
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switch v.Kind() {
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case reflect.String:
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fmt.Fprintf(w, `"%s"`, v)
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case reflect.Slice:
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w.Write([]byte{'['})
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for i := 0; i < v.Len(); i++ {
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if i > 0 {
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w.Write([]byte{' '})
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}
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stringifyValue(w, v.Index(i))
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}
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w.Write([]byte{']'})
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return
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case reflect.Struct:
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if v.Type().Name() != "" {
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w.Write([]byte(v.Type().String()))
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}
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w.Write([]byte{'{'})
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var sep bool
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for i := 0; i < v.NumField(); i++ {
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fv := v.Field(i)
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if fv.Kind() == reflect.Ptr && fv.IsNil() {
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continue
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}
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if fv.Kind() == reflect.Slice && fv.IsNil() {
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continue
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}
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if sep {
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w.Write([]byte(", "))
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} else {
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sep = true
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}
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w.Write([]byte(v.Type().Field(i).Name))
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w.Write([]byte{':'})
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stringifyValue(w, fv)
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}
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w.Write([]byte{'}'})
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default:
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if v.CanInterface() {
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fmt.Fprint(w, v.Interface())
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}
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}
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}
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