92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
|
package sec
|
||
|
|
|
||
|
|
import (
|
||
|
|
// stdlib
|
||
|
|
"reflect"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Composes full tree for every structure member.
|
||
|
|
func composeTree(value reflect.Value, prefix string) {
|
||
|
|
typeOf := value.Type()
|
||
|
|
|
||
|
|
// Compose prefix for everything below current field.
|
||
|
|
var curPrefix string
|
||
|
|
if prefix != "" {
|
||
|
|
curPrefix = prefix
|
||
|
|
if !strings.HasSuffix(curPrefix, "_") {
|
||
|
|
curPrefix += "_"
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for i := 0; i < value.NumField(); i++ {
|
||
|
|
fieldToProcess := value.Field(i)
|
||
|
|
fieldToProcessType := typeOf.Field(i)
|
||
|
|
|
||
|
|
// If currently processed field - interface, then we should
|
||
|
|
// get underlying value.
|
||
|
|
//if fieldToProcess.Kind() == reflect.Interface {
|
||
|
|
// fieldToProcess = fieldToProcess.Elem()
|
||
|
|
//}
|
||
|
|
|
||
|
|
// In 99% of cases we will get uninitialized things we should
|
||
|
|
// initialize.
|
||
|
|
switch fieldToProcess.Kind() {
|
||
|
|
case reflect.Ptr, reflect.Map, reflect.Slice, reflect.Chan:
|
||
|
|
if fieldToProcess.IsNil() {
|
||
|
|
printDebug("Field '%s' is nil, initializing new one", fieldToProcessType.Name)
|
||
|
|
|
||
|
|
// We should use only exported fields as unexported aren't
|
||
|
|
// settable using 'reflect' package. Can be possibly solved
|
||
|
|
// using unsafe pointers?
|
||
|
|
if fieldToProcess.CanSet() {
|
||
|
|
fieldToProcess.Set(reflect.New(fieldToProcess.Type().Elem()))
|
||
|
|
} else {
|
||
|
|
printDebug("Field '%s' is unexported and will be ignored", fieldToProcessType.Name)
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
fieldToProcess = fieldToProcess.Elem()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
printDebug("Field: '%s', type: %s, (anonymous or embedded: %t)", fieldToProcessType.Name, fieldToProcess.Type().Kind().String(), fieldToProcessType.Anonymous)
|
||
|
|
|
||
|
|
// Dealing with embedded things.
|
||
|
|
if fieldToProcessType.Anonymous {
|
||
|
|
// We should not allow anything other than struct.
|
||
|
|
if fieldToProcess.Kind() != reflect.Struct {
|
||
|
|
printDebug("Field is embedded, but not a struct (%s), which cannot be used", fieldToProcess.Kind().String())
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if fieldToProcess.Kind() != reflect.Struct && !fieldToProcess.CanSet() {
|
||
|
|
printDebug("Field '%s' can't be set, skipping", fieldToProcessType.Name)
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
printDebug("All underlying elements will have prefix '%s'", curPrefix)
|
||
|
|
|
||
|
|
// Hello, I'm recursion and I'm here to make you happy.
|
||
|
|
// I'll be launched only for structures to get their fields.
|
||
|
|
if fieldToProcess.Kind() == reflect.Struct {
|
||
|
|
newElementPrefix := curPrefix
|
||
|
|
if !fieldToProcessType.Anonymous {
|
||
|
|
newElementPrefix = strings.ToUpper(newElementPrefix + typeOf.Field(i).Name)
|
||
|
|
}
|
||
|
|
composeTree(fieldToProcess, newElementPrefix)
|
||
|
|
} else {
|
||
|
|
f := &field{
|
||
|
|
Name: typeOf.Field(i).Name,
|
||
|
|
EnvVar: curPrefix + strings.ToUpper(typeOf.Field(i).Name),
|
||
|
|
Pointer: fieldToProcess,
|
||
|
|
Kind: fieldToProcess.Kind(),
|
||
|
|
}
|
||
|
|
|
||
|
|
parsedTree = append(parsedTree, f)
|
||
|
|
|
||
|
|
printDebug("Field data constructed: %+v", f)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|