You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.2 KiB
133 lines
3.2 KiB
package config
|
|
|
|
import (
|
|
"fmt"
|
|
"regexp"
|
|
"strings"
|
|
|
|
"github.com/go-kratos/kratos/v2/encoding"
|
|
"github.com/go-kratos/kratos/v2/log"
|
|
)
|
|
|
|
// Decoder is config decoder.
|
|
type Decoder func(*KeyValue, map[string]interface{}) error
|
|
|
|
// Resolver resolve placeholder in config.
|
|
type Resolver func(map[string]interface{}) error
|
|
|
|
// Option is config option.
|
|
type Option func(*options)
|
|
|
|
type options struct {
|
|
sources []Source
|
|
decoder Decoder
|
|
resolver Resolver
|
|
}
|
|
|
|
// WithSource with config source.
|
|
func WithSource(s ...Source) Option {
|
|
return func(o *options) {
|
|
o.sources = s
|
|
}
|
|
}
|
|
|
|
// WithDecoder with config decoder.
|
|
// DefaultDecoder behavior:
|
|
// If KeyValue.Format is non-empty, then KeyValue.Value will be deserialized into map[string]interface{}
|
|
// and stored in the config cache(map[string]interface{})
|
|
// if KeyValue.Format is empty,{KeyValue.Key : KeyValue.Value} will be stored in config cache(map[string]interface{})
|
|
func WithDecoder(d Decoder) Option {
|
|
return func(o *options) {
|
|
o.decoder = d
|
|
}
|
|
}
|
|
|
|
// WithResolver with config resolver.
|
|
func WithResolver(r Resolver) Option {
|
|
return func(o *options) {
|
|
o.resolver = r
|
|
}
|
|
}
|
|
|
|
// WithLogger with config logger.
|
|
// Deprecated: use global logger instead.
|
|
func WithLogger(l log.Logger) Option {
|
|
return func(o *options) {}
|
|
}
|
|
|
|
// defaultDecoder decode config from source KeyValue
|
|
// to target map[string]interface{} using src.Format codec.
|
|
func defaultDecoder(src *KeyValue, target map[string]interface{}) error {
|
|
if src.Format == "" {
|
|
// expand key "aaa.bbb" into map[aaa]map[bbb]interface{}
|
|
keys := strings.Split(src.Key, ".")
|
|
for i, k := range keys {
|
|
if i == len(keys)-1 {
|
|
target[k] = src.Value
|
|
} else {
|
|
sub := make(map[string]interface{})
|
|
target[k] = sub
|
|
target = sub
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
if codec := encoding.GetCodec(src.Format); codec != nil {
|
|
return codec.Unmarshal(src.Value, &target)
|
|
}
|
|
return fmt.Errorf("unsupported key: %s format: %s", src.Key, src.Format)
|
|
}
|
|
|
|
// defaultResolver resolve placeholder in map value,
|
|
// placeholder format in ${key:default}.
|
|
func defaultResolver(input map[string]interface{}) error {
|
|
mapper := func(name string) string {
|
|
args := strings.SplitN(strings.TrimSpace(name), ":", 2) //nolint:gomnd
|
|
if v, has := readValue(input, args[0]); has {
|
|
s, _ := v.String()
|
|
return s
|
|
} else if len(args) > 1 { // default value
|
|
return args[1]
|
|
}
|
|
return ""
|
|
}
|
|
|
|
var resolve func(map[string]interface{}) error
|
|
resolve = func(sub map[string]interface{}) error {
|
|
for k, v := range sub {
|
|
switch vt := v.(type) {
|
|
case string:
|
|
sub[k] = expand(vt, mapper)
|
|
case map[string]interface{}:
|
|
if err := resolve(vt); err != nil {
|
|
return err
|
|
}
|
|
case []interface{}:
|
|
for i, iface := range vt {
|
|
switch it := iface.(type) {
|
|
case string:
|
|
vt[i] = expand(it, mapper)
|
|
case map[string]interface{}:
|
|
if err := resolve(it); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
sub[k] = vt
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
return resolve(input)
|
|
}
|
|
|
|
func expand(s string, mapping func(string) string) string {
|
|
r := regexp.MustCompile(`\${(.*?)}`)
|
|
re := r.FindAllStringSubmatch(s, -1)
|
|
for _, i := range re {
|
|
if len(i) == 2 { //nolint:gomnd
|
|
s = strings.ReplaceAll(s, i[0], mapping(i[1]))
|
|
}
|
|
}
|
|
return s
|
|
}
|
|
|