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100 lines
1.8 KiB
100 lines
1.8 KiB
package yaml
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"gitoa.ru/go-4devs/config"
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"gitoa.ru/go-4devs/config/value"
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"gopkg.in/yaml.v3"
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)
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const (
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Name = "yaml"
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)
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var _ config.Provider = (*Provider)(nil)
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func NewFile(name string, opts ...Option) (*Provider, error) {
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in, err := os.ReadFile(name)
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if err != nil {
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return nil, fmt.Errorf("yaml_file: read error: %w", err)
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}
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return New(in, opts...)
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}
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func New(yml []byte, opts ...Option) (*Provider, error) {
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var data yaml.Node
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if err := yaml.Unmarshal(yml, &data); err != nil {
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return nil, fmt.Errorf("yaml: unmarshal err: %w", err)
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}
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return create(opts...).With(&data), nil
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}
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func create(opts ...Option) *Provider {
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prov := Provider{
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name: Name,
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}
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for _, opt := range opts {
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opt(&prov)
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}
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return &prov
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}
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type Option func(*Provider)
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type Provider struct {
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data node
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name string
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}
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func (p *Provider) Name() string {
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return p.name
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}
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func (p *Provider) Value(_ context.Context, path ...string) (config.Value, error) {
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return p.data.read(p.Name(), path)
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}
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func (p *Provider) With(data *yaml.Node) *Provider {
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return &Provider{
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data: node{Node: data},
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}
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}
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type node struct {
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*yaml.Node
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}
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func (n *node) read(name string, keys []string) (config.Value, error) {
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val, err := getData(n.Node.Content[0].Content, keys)
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if err != nil {
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if errors.Is(err, config.ErrValueNotFound) {
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return nil, fmt.Errorf("%w: %s", config.ErrValueNotFound, name)
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}
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return nil, fmt.Errorf("%w: %s", err, name)
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}
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return value.Decode(val), nil
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}
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func getData(node []*yaml.Node, keys []string) (func(interface{}) error, error) {
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for idx := len(node) - 1; idx > 0; idx -= 2 {
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if node[idx-1].Value == keys[0] {
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if len(keys) > 1 {
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return getData(node[idx].Content, keys[1:])
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}
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return node[idx].Decode, nil
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}
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}
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return nil, config.ErrValueNotFound
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}
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