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inner.go
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inner.go
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package env
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"time"
"unsafe"
"zestack.dev/cast"
)
var _ Signer = &inner{}
type inner struct {
lookup func(key string) (string, bool)
exists func(key string) bool
iter func() func() (key string, value string, ok bool)
}
func (i *inner) Lookup(key string) (string, bool) {
return i.lookup(key)
}
func (i *inner) Exists(key string) bool {
return i.exists(key)
}
// String 取字符串值
func (i *inner) String(key string, fallback ...string) string {
if value, exists := i.Lookup(key); exists {
return value
}
for _, value := range fallback {
return value
}
return ""
}
// Bytes 取二进制值
func (i *inner) Bytes(key string, fallback ...[]byte) []byte {
if value, exists := i.Lookup(key); exists {
return []byte(value)
}
for _, bytes := range fallback {
return bytes
}
return []byte{}
}
// Int 取整型值
func (i *inner) Int(key string, fallback ...int) int {
if val, exists := i.Lookup(key); exists {
if n, err := strconv.Atoi(val); err == nil {
return n
}
}
for _, value := range fallback {
return value
}
return 0
}
func (i *inner) Duration(key string, fallback ...time.Duration) time.Duration {
if val, ok := i.Lookup(key); ok {
n, err := strconv.Atoi(val)
if err == nil {
return time.Duration(n)
}
d, err := time.ParseDuration(val)
if err == nil {
return d
}
}
for _, value := range fallback {
return value
}
return 0
}
func (i *inner) Bool(key string, fallback ...bool) bool {
if val, ok := i.Lookup(key); ok {
bl, err := strconv.ParseBool(val)
if err == nil {
return bl
}
}
for _, value := range fallback {
return value
}
return false
}
// List 将值按 `,` 分割并返回
func (i *inner) List(key string, fallback ...[]string) []string {
if value, ok := i.Lookup(key); ok {
parts := strings.Split(value, ",")
for i, part := range parts {
parts[i] = strings.TrimSpace(part)
}
return parts
}
for _, value := range fallback {
return value
}
return []string{}
}
// Map 获取指定前缀的所有值
func (i *inner) Map(prefix string) map[string]string {
result := map[string]string{}
next := i.iter()
for {
key, value, ok := next()
if !ok {
return result
}
if strings.HasPrefix(key, prefix) {
name := strings.TrimPrefix(key, prefix)
result[name] = strings.TrimSpace(value)
}
}
}
// Where 获取符合过滤器的所有值
func (i *inner) Where(filter func(name, value string) bool) map[string]string {
result := map[string]string{}
next := i.iter()
for {
key, value, ok := next()
if !ok {
return result
}
if filter(key, value) {
result[key] = value
}
}
}
// Fill 将环境变量填充到指定结构体
func (i *inner) Fill(structure any) error {
inputType := reflect.TypeOf(structure)
if inputType != nil && inputType.Kind() == reflect.Ptr && inputType.Elem().Kind() == reflect.Struct {
return i.fillStruct(reflect.ValueOf(structure).Elem())
}
return errors.New("env: invalid structure")
}
func (i *inner) fillStruct(s reflect.Value) error {
for j := 0; j < s.NumField(); j++ {
if t, exist := s.Type().Field(j).Tag.Lookup("env"); exist {
if osv := i.String(t); osv != "" {
v, err := cast.FromType(osv, s.Type().Field(j).Type)
if err != nil {
return fmt.Errorf("env: cannot set `%v` field; err: %v", s.Type().Field(j).Name, err)
}
ptr := reflect.NewAt(s.Field(j).Type(), unsafe.Pointer(s.Field(j).UnsafeAddr())).Elem()
ptr.Set(reflect.ValueOf(v))
}
} else if s.Type().Field(j).Type.Kind() == reflect.Struct {
if err := i.fillStruct(s.Field(j)); err != nil {
return err
}
} else if s.Type().Field(j).Type.Kind() == reflect.Ptr {
if s.Field(j).IsZero() == false && s.Field(j).Elem().Type().Kind() == reflect.Struct {
if err := i.fillStruct(s.Field(j).Elem()); err != nil {
return err
}
}
}
}
return nil
}