micro/config/source/consul/util.go

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package consul
import (
"fmt"
"strings"
"github.com/hashicorp/consul/api"
"github.com/micro/go-micro/config/encoder"
)
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type configValue interface {
Value() interface{}
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Decode(encoder.Encoder, []byte) error
}
type configArrayValue struct {
v []interface{}
}
func (a *configArrayValue) Value() interface{} { return a.v }
func (a *configArrayValue) Decode(e encoder.Encoder, b []byte) error {
return e.Decode(b, &a.v)
}
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type configMapValue struct {
v map[string]interface{}
}
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func (m *configMapValue) Value() interface{} { return m.v }
func (m *configMapValue) Decode(e encoder.Encoder, b []byte) error {
return e.Decode(b, &m.v)
}
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func makeMap(e encoder.Encoder, kv api.KVPairs, stripPrefix string) (map[string]interface{}, error) {
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data := make(map[string]interface{})
// consul guarantees lexicographic order, so no need to sort
for _, v := range kv {
pathString := strings.TrimPrefix(strings.TrimPrefix(v.Key, strings.TrimPrefix(stripPrefix, "/")), "/")
if pathString == "" {
continue
}
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var val configValue
var err error
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// ensure a valid value is stored at this location
if len(v.Value) > 0 {
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// try to decode into map value or array value
arrayV := &configArrayValue{v: []interface{}{}}
mapV := &configMapValue{v: map[string]interface{}{}}
switch {
case arrayV.Decode(e, v.Value) == nil:
val = arrayV
case mapV.Decode(e, v.Value) == nil:
val = mapV
default:
return nil, fmt.Errorf("faild decode value. path: %s, error: %s", pathString, err)
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}
}
// set target at the root
target := data
path := strings.Split(pathString, "/")
// find (or create) the leaf node we want to put this value at
for _, dir := range path[:len(path)-1] {
if _, ok := target[dir]; !ok {
target[dir] = make(map[string]interface{})
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}
target = target[dir].(map[string]interface{})
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}
leafDir := path[len(path)-1]
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// copy over the keys from the value
switch val.(type) {
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case *configArrayValue:
target[leafDir] = val.Value()
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case *configMapValue:
target[leafDir] = make(map[string]interface{})
target = target[leafDir].(map[string]interface{})
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mapv := val.Value().(map[string]interface{})
for k := range mapv {
target[k] = mapv[k]
}
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}
}
return data, nil
}