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sbased.go
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sbased.go
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package dsco
import (
"errors"
"fmt"
"reflect"
"sort"
"strings"
"gopkg.in/yaml.v3"
"github.com/byte4ever/dsco/internal/fvalue"
"github.com/byte4ever/dsco/internal/ierror"
"github.com/byte4ever/dsco/internal/merror"
model2 "github.com/byte4ever/dsco/internal/model"
"github.com/byte4ever/dsco/registry"
"github.com/byte4ever/dsco/svalue"
)
// ErrInvalidType represent an error where ....
var ErrInvalidType = errors.New("invalid type")
// ErrParse represents an error indicating that a value cannot be parsed.
var ErrParse = errors.New("parse error")
type ParseError struct {
Path string
Type reflect.Type
Location string
}
func (a ParseError) Error() string {
return fmt.Sprintf(
"parse error on %s-<%s> %s",
a.Path,
registry.LongTypeName(a.Type),
a.Location,
)
}
func (ParseError) Is(err error) bool {
return errors.Is(err, ErrParse)
}
// ErrAliasCollision represents an error indicating that an alias is colliding
// with an actual key in the structure.
var ErrAliasCollision = errors.New("alias collision")
type AliasCollisionError struct {
Path string
}
func (a AliasCollisionError) Error() string {
return fmt.Sprintf("alias %s collides with structure", a.Path)
}
func (AliasCollisionError) Is(err error) bool {
return errors.Is(err, ErrAliasCollision)
}
// ErrUnboundedLocation represents an error indicating that a key is never
// bound to the
// structure.
var ErrUnboundedLocation = errors.New("unbound key")
type UnboundedLocationErrors []UnboundedLocationError
func (u UnboundedLocationErrors) Len() int {
return len(u)
}
func (u UnboundedLocationErrors) Less(i, j int) bool {
return u[i].Location < u[j].Location
}
func (u UnboundedLocationErrors) Swap(i, j int) {
u[i], u[j] = u[j], u[i]
}
type UnboundedLocationError struct {
Location string
}
func (a UnboundedLocationError) Error() string {
return fmt.Sprintf("unbounded location %s", a.Location)
}
func (UnboundedLocationError) Is(err error) bool {
return errors.Is(err, ErrUnboundedLocation)
}
// ErrOverriddenKey represents an error indicating that a potential key binding
// wha overridden in another layer.
var ErrOverriddenKey = errors.New("overridden key")
type OverriddenKeyError struct {
Path string
Location string
OverrideLocation string
}
func (a OverriddenKeyError) Error() string {
return fmt.Sprintf(
"for path %s %s is override by %s",
a.Path,
a.Location,
a.OverrideLocation,
)
}
func (OverriddenKeyError) Is(err error) bool {
return errors.Is(err, ErrOverriddenKey)
}
// ErrNilProvider is shitty...
var ErrNilProvider = errors.New("nil provider")
// StringBasedBuilder is a value bases builder depending on text values.
type StringBasedBuilder struct {
internalOpts
values svalue.Values
expandedValues map[string]*fvalue.Value
}
// ErrNoAliasesProvided represent an error where no aliases map was
// provided with option.
var ErrNoAliasesProvided = errors.New("no aliases provided")
// Option is processing option for string based binder.
type Option interface {
apply(opts *internalOpts) error
}
type internalOpts struct {
aliases map[string]string
}
// AliasesOption defines keys aliasing.
type AliasesOption map[string]string
func (o *internalOpts) applyOptions(options []Option) error {
for i, option := range options {
if err := option.apply(o); err != nil {
return ierror.IError{
Index: i,
Info: "when processing option",
Err: err,
}
}
}
return nil
}
func (a AliasesOption) apply(opts *internalOpts) error {
if len(a) > 0 {
opts.aliases = a
return nil
}
return ErrNoAliasesProvided
}
// WithAliases returns a keys aliasing option.
func WithAliases(mapping map[string]string) AliasesOption {
return mapping
}
// NewStringBasedBuilder creates a bases builder for the provided path/text
// value set.
func NewStringBasedBuilder(
provider StringValuesProvider,
options ...Option,
) (
*StringBasedBuilder,
error,
) {
if provider == nil {
return nil, ErrNilProvider
}
internalOptions := internalOpts{}
if err := internalOptions.applyOptions(options); err != nil {
return nil, err
}
values := provider.GetStringValues()
if len(internalOptions.aliases) == 0 {
return &StringBasedBuilder{
internalOpts: internalOptions,
values: values,
expandedValues: make(map[string]*fvalue.Value),
}, nil
}
converted := make(svalue.Values, len(values))
for n, value := range values {
if target, found := internalOptions.aliases[n]; found {
converted[target] = value
continue
}
converted[n] = value
}
return &StringBasedBuilder{
internalOpts: internalOptions,
values: converted,
expandedValues: make(map[string]*fvalue.Value),
}, nil
}
func (s *StringBasedBuilder) Expand(
path string,
_type reflect.Type) (
err error,
) {
convertedPath := convert(path)
// check for alias collisions
if _, found := s.internalOpts.aliases[convertedPath]; found {
return AliasCollisionError{
Path: path,
}
}
entry, found := s.values[convertedPath]
if !found {
return nil
}
delete(s.values, convertedPath)
tp := reflect.New(_type.Elem())
err = yaml.Unmarshal(
[]byte(entry.Value), tp.Interface(),
)
if err != nil {
return ParseError{
path,
_type,
entry.Location,
}
}
model, err := model2.NewModel(_type)
if err != nil {
return fmt.Errorf("when expanding: %w", err)
}
valuesFor := model.GetFieldValuesFor(entry.Location, tp)
for _, value := range valuesFor {
s.expandedValues[strings.Join([]string{path, value.Path}, ".")] = value
}
return nil
}
func (s *StringBasedBuilder) Get(
path string,
_type reflect.Type,
) (
fieldValue *fvalue.Value,
err error,
) {
convertedPath := convert(path)
// check for alias collisions
if _, found := s.internalOpts.aliases[convertedPath]; found {
return nil, AliasCollisionError{
Path: path,
}
}
expandedEntry, found := s.expandedValues[path]
if found {
delete(s.expandedValues, path)
return expandedEntry, nil
}
entry, found := s.values[convertedPath]
if !found {
return nil, nil //nolint:nilnil // required when nothing is found
}
switch _type.Kind() { //nolint:exhaustive // it's expected
case reflect.Pointer:
tp := reflect.New(_type.Elem())
delete(s.values, convertedPath)
if err := yaml.Unmarshal(
[]byte(entry.Value), tp.Interface(),
); err != nil {
return nil, ParseError{
path,
_type,
entry.Location,
}
}
return &fvalue.Value{
Value: tp,
Location: entry.Location,
}, nil
case reflect.Slice:
tp := reflect.New(_type)
delete(s.values, convertedPath)
if err := yaml.Unmarshal(
[]byte(entry.Value), tp.Interface(),
); err != nil {
return nil, ParseError{
path,
_type,
entry.Location,
}
}
return &fvalue.Value{
Value: tp.Elem(),
Location: entry.Location,
}, nil
default:
return nil, fmt.Errorf(
"%s: %w",
path,
ErrInvalidType,
)
}
}
type GetError struct {
merror.MError
}
var ErrGet = errors.New("")
func (GetError) Is(err error) bool {
return errors.Is(err, ErrGet)
}
// GetBaseFor creates the bases.
func (s *StringBasedBuilder) GetFieldValuesFrom(
model ModelInterface,
) (
fvalue.Values,
error,
) {
var errs GetError
if err := model.Expand(s); err != nil {
errs.Add(err)
}
result, e := model.ApplyOn(s)
if e != nil {
errs.Add(e)
}
var e2s UnboundedLocationErrors
for _, v := range s.values {
e2s = append(
e2s,
UnboundedLocationError{
Location: v.Location,
},
)
}
for _, v := range s.expandedValues {
e2s = append(
e2s,
UnboundedLocationError{
Location: v.Location,
},
)
}
if len(e2s) > 0 {
sort.Sort(e2s)
for _, e2 := range e2s {
errs.Add(e2)
}
}
if errs.None() {
return result, nil
}
return nil, errs
}