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etcdmap.go
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/
etcdmap.go
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// Package etcdmap provides methods for interacting with etcd using struct, map or JSON.
package etcdmap
import (
"encoding/json"
"fmt"
"log"
pathx "path"
"reflect"
"strconv"
"strings"
"github.com/coreos/etcd/client"
"golang.org/x/net/context"
)
func strToInt(v string, k reflect.Kind) (reflect.Value, error) {
switch k {
case reflect.Int:
i, err := strconv.ParseInt(v, 10, 0)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(int(i)), nil
case reflect.Int8:
i, err := strconv.ParseInt(v, 10, 8)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(int8(i)), nil
case reflect.Int16:
i, err := strconv.ParseInt(v, 10, 16)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(int16(i)), nil
case reflect.Int32:
i, err := strconv.ParseInt(v, 10, 32)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(int32(i)), nil
case reflect.Int64:
i, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(int64(i)), nil
}
return reflect.Value{}, fmt.Errorf("unsupported type: %s", k)
}
func strToUint(v string, k reflect.Kind) (reflect.Value, error) {
switch k {
case reflect.Uint:
i, err := strconv.ParseUint(v, 10, 0)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(uint(i)), nil
case reflect.Uint8:
i, err := strconv.ParseUint(v, 10, 8)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(uint8(i)), nil
case reflect.Uint16:
i, err := strconv.ParseUint(v, 10, 16)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(uint16(i)), nil
case reflect.Uint32:
i, err := strconv.ParseUint(v, 10, 32)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(uint32(i)), nil
case reflect.Uint64:
i, err := strconv.ParseUint(v, 10, 64)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(uint64(i)), nil
}
return reflect.Value{}, fmt.Errorf("unsupported type: %s", k)
}
func strToFloat(v string, k reflect.Kind) (reflect.Value, error) {
switch k {
case reflect.Float32:
i, err := strconv.ParseFloat(v, 32)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(float32(i)), nil
case reflect.Float64:
i, err := strconv.ParseFloat(v, 64)
if err != nil {
return reflect.Value{}, err
}
return reflect.ValueOf(float64(i)), nil
}
return reflect.Value{}, fmt.Errorf("unsupported type: %s", k)
}
func Struct(root *client.Node, val reflect.Value) error {
m := Map(root)
s := val.Elem()
for i := 0; i < s.NumField(); i++ {
t := s.Type().Field(i)
k := t.Tag.Get("etcd")
if v, ok := m[k]; ok {
f := s.Field(i)
switch f.Type().Kind() {
case reflect.String:
f.Set(reflect.ValueOf(v))
case reflect.Bool:
i, err := strconv.ParseBool(v.(string))
if err != nil {
return err
}
f.SetBool(i)
case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64:
i, err := strToInt(v.(string), f.Type().Kind())
if err != nil {
return err
}
f.Set(i)
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64:
i, err := strToUint(v.(string), f.Type().Kind())
if err != nil {
return err
}
f.Set(i)
case reflect.Float32, reflect.Float64:
i, err := strToFloat(v.(string), f.Type().Kind())
if err != nil {
return err
}
f.Set(i)
default:
return fmt.Errorf("unsupported type: %s for key: %s", f.Type().Kind(), k)
}
}
}
return nil
}
// JSON returns an etcd directory as JSON []byte.
func JSON(root *client.Node) ([]byte, error) {
j, err := json.Marshal(Map(root))
if err != nil {
return []byte{}, err
}
return j, nil
}
// JSON returns an etcd directory as JSON []byte.
func ArrayJSON(root *client.Node, dirName string) ([]byte, error) {
j, err := json.Marshal(Array(root, dirName))
if err != nil {
return []byte{}, err
}
return j, nil
}
// JSONIndent returns an etcd directory as indented JSON []byte.
func JSONIndent(root *client.Node, indent string) ([]byte, error) {
j, err := json.MarshalIndent(Map(root), "", indent)
if err != nil {
return []byte{}, err
}
return j, nil
}
// JSONIndent returns an etcd directory as indented JSON []byte.
func ArrayJSONIndent(root *client.Node, dirName string, indent string) ([]byte, error) {
j, err := json.MarshalIndent(Array(root, dirName), "", indent)
if err != nil {
return []byte{}, err
}
return j, nil
}
// Map returns a map[string]interface{} from a etcd directory.
func Map(root *client.Node) map[string]interface{} {
v := make(map[string]interface{})
for _, n := range root.Nodes {
keys := strings.Split(n.Key, "/")
k := keys[len(keys)-1]
if n.Dir {
v[k] = make(map[string]interface{})
v[k] = Map(n)
} else {
v[k] = n.Value
}
}
return v
}
// Array returns a []interface{} including the directory name inside each entry from a etcd directory.
func Array(root *client.Node, dirName string) []interface{} {
v := []interface{}{}
if dirName == "" {
dirName = "dir"
}
for _, n := range root.Nodes {
keys := strings.Split(n.Key, "/")
k := keys[len(keys)-1]
if n.Dir {
m := make(map[string]interface{})
m = Map(n)
m[dirName] = k
v = append(v, m)
}
}
return v
}
// createDir will create path if it doesn't exist and is not root.
func createDir(kapi client.KeysAPI, path string) error {
if path != "/" {
if _, err := kapi.Set(context.TODO(), path, "", &client.SetOptions{Dir: true, PrevExist: client.PrevNoExist}); err != nil {
if etcdErr, ok := err.(client.Error); ok {
if etcdErr.Code == client.ErrorCodeNodeExist {
return nil
}
}
return err
}
}
return nil
}
// Create etcd directory structure from a map, slice or struct.
func Create(kapi client.KeysAPI, path string, val reflect.Value) error {
switch val.Kind() {
case reflect.Ptr:
orig := val.Elem()
if !orig.IsValid() {
return nil
}
if err := Create(kapi, path, orig); err != nil {
return err
}
case reflect.Interface:
orig := val.Elem()
if err := Create(kapi, path, orig); err != nil {
return err
}
case reflect.Struct:
if err := createDir(kapi, path); err != nil {
return err
}
for i := 0; i < val.NumField(); i++ {
t := val.Type().Field(i)
k := t.Tag.Get("etcd")
if err := Create(kapi, path+"/"+k, val.Field(i)); err != nil {
return err
}
}
case reflect.Map:
if strings.HasPrefix(pathx.Base(path), "_") {
log.Printf("create hidden directory in etcd: %s", path)
}
if err := createDir(kapi, path); err != nil {
return err
}
for _, k := range val.MapKeys() {
v := val.MapIndex(k)
if err := Create(kapi, path+"/"+k.String(), v); err != nil {
return err
}
}
case reflect.Slice:
if err := createDir(kapi, path); err != nil {
return err
}
for i := 0; i < val.Len(); i++ {
if err := Create(kapi, fmt.Sprintf("%s/%d", path, i), val.Index(i)); err != nil {
return err
}
}
case reflect.String:
if strings.HasPrefix(pathx.Base(path), "_") {
log.Printf("set hidden key in etcd: %s", path)
}
_, err := kapi.Set(context.TODO(), path, val.String(), nil)
if err != nil {
return err
}
case reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64:
if strings.HasPrefix(pathx.Base(path), "_") {
log.Printf("set hidden key in etcd: %s", path)
}
_, err := kapi.Set(context.TODO(), path, fmt.Sprintf("%v", val.Interface()), nil)
if err != nil {
return err
}
default:
return fmt.Errorf("unsupported type: %s for path: %s", val.Kind(), path)
}
return nil
}
// CreateJSON etcd directory structure from JSON.
func CreateJSON(kapi client.KeysAPI, dir string, j []byte) error {
m := make(map[string]interface{})
if err := json.Unmarshal(j, &m); err != nil {
return err
}
return Create(kapi, dir, reflect.ValueOf(m))
}