micro-config-env/env.go

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package env // import "go.unistack.org/micro-config-env/v3"
import (
"context"
"fmt"
"os"
"reflect"
"strconv"
"strings"
"github.com/imdario/mergo"
"go.unistack.org/micro/v3/config"
rutil "go.unistack.org/micro/v3/util/reflect"
)
var DefaultStructTag = "env"
type envConfig struct {
opts config.Options
}
func (c *envConfig) Options() config.Options {
return c.opts
}
func (c *envConfig) Init(opts ...config.Option) error {
for _, o := range opts {
o(&c.opts)
}
return nil
}
func (c *envConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
if err := config.DefaultBeforeLoad(ctx, c); err != nil {
return err
}
options := config.NewLoadOptions(opts...)
mopts := []func(*mergo.Config){mergo.WithTypeCheck}
if options.Override {
mopts = append(mopts, mergo.WithOverride)
}
if options.Append {
mopts = append(mopts, mergo.WithAppendSlice)
}
src, err := rutil.Zero(c.opts.Struct)
if err == nil {
if err = fillValues(ctx, reflect.ValueOf(src), c.opts.StructTag); err == nil {
err = mergo.Merge(c.opts.Struct, src, mopts...)
}
}
if err != nil {
c.opts.Logger.Errorf(c.opts.Context, "env load err: %v", err)
if !c.opts.AllowFail {
return err
}
}
if err := config.DefaultAfterLoad(ctx, c); err != nil {
return err
}
return nil
}
func fillValue(ctx context.Context, value reflect.Value, val string) error {
switch value.Kind() {
case reflect.Map:
t := value.Type()
nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
if value.IsNil() {
value.Set(reflect.MakeMapWithSize(t, len(nvals)))
}
kt := t.Key()
et := t.Elem()
for _, nval := range nvals {
kv := strings.FieldsFunc(nval, func(c rune) bool { return c == '=' })
mkey := reflect.Indirect(reflect.New(kt))
mval := reflect.Indirect(reflect.New(et))
if err := fillValue(ctx, mkey, kv[0]); err != nil {
return err
}
if err := fillValue(ctx, mval, kv[1]); err != nil {
return err
}
value.SetMapIndex(mkey, mval)
}
case reflect.Slice, reflect.Array:
nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
value.Set(reflect.MakeSlice(reflect.SliceOf(value.Type().Elem()), len(nvals), len(nvals)))
for idx, nval := range nvals {
nvalue := reflect.Indirect(reflect.New(value.Type().Elem()))
if err := fillValue(ctx, nvalue, nval); err != nil {
return err
}
value.Index(idx).Set(nvalue)
}
case reflect.Bool:
v, err := strconv.ParseBool(val)
if err != nil {
return err
}
value.Set(reflect.ValueOf(v))
case reflect.String:
value.Set(reflect.ValueOf(val))
case reflect.Float32:
v, err := strconv.ParseFloat(val, 32)
if err != nil {
return err
}
value.Set(reflect.ValueOf(float32(v)))
case reflect.Float64:
v, err := strconv.ParseFloat(val, 64)
if err != nil {
return err
}
value.Set(reflect.ValueOf(float64(v)))
case reflect.Int:
v, err := strconv.ParseInt(val, 10, 0)
if err != nil {
return err
}
value.Set(reflect.ValueOf(int(v)))
case reflect.Int8:
v, err := strconv.ParseInt(val, 10, 8)
if err != nil {
return err
}
value.Set(reflect.ValueOf(v))
case reflect.Int16:
v, err := strconv.ParseInt(val, 10, 16)
if err != nil {
return err
}
value.Set(reflect.ValueOf(int16(v)))
case reflect.Int32:
v, err := strconv.ParseInt(val, 10, 32)
if err != nil {
return err
}
value.Set(reflect.ValueOf(int32(v)))
case reflect.Int64:
v, err := strconv.ParseInt(val, 10, 64)
if err != nil {
return err
}
value.Set(reflect.ValueOf(int64(v)))
case reflect.Uint:
v, err := strconv.ParseUint(val, 10, 0)
if err != nil {
return err
}
value.Set(reflect.ValueOf(uint(v)))
case reflect.Uint8:
v, err := strconv.ParseUint(val, 10, 8)
if err != nil {
return err
}
value.Set(reflect.ValueOf(uint8(v)))
case reflect.Uint16:
v, err := strconv.ParseUint(val, 10, 16)
if err != nil {
return err
}
value.Set(reflect.ValueOf(uint16(v)))
case reflect.Uint32:
v, err := strconv.ParseUint(val, 10, 32)
if err != nil {
return err
}
value.Set(reflect.ValueOf(uint32(v)))
case reflect.Uint64:
v, err := strconv.ParseUint(val, 10, 64)
if err != nil {
return err
}
value.Set(reflect.ValueOf(uint64(v)))
}
return nil
}
func (c *envConfig) setValues(ctx context.Context, valueOf reflect.Value) error {
var values reflect.Value
if valueOf.Kind() == reflect.Ptr {
values = valueOf.Elem()
} else {
values = valueOf
}
if values.Kind() == reflect.Invalid {
return config.ErrInvalidStruct
}
fields := values.Type()
for idx := 0; idx < fields.NumField(); idx++ {
field := fields.Field(idx)
value := values.Field(idx)
if rutil.IsZero(value) {
continue
}
if len(field.PkgPath) != 0 {
continue
}
switch value.Kind() {
case reflect.Struct:
if err := c.setValues(ctx, value); err != nil {
return err
}
continue
case reflect.Ptr:
value = value.Elem()
if err := c.setValues(ctx, value); err != nil {
return err
}
continue
}
tag, ok := field.Tag.Lookup(c.opts.StructTag)
if !ok {
continue
}
if err := os.Setenv(tag, fmt.Sprintf("%v", value.Interface())); err != nil && !c.opts.AllowFail {
return err
}
}
return nil
}
func fillValues(ctx context.Context, valueOf reflect.Value, structTag string) error {
var values reflect.Value
if valueOf.Kind() == reflect.Ptr {
values = valueOf.Elem()
} else {
values = valueOf
}
if values.Kind() == reflect.Invalid {
return config.ErrInvalidStruct
}
fields := values.Type()
for idx := 0; idx < fields.NumField(); idx++ {
field := fields.Field(idx)
value := values.Field(idx)
if !value.CanSet() {
continue
}
if len(field.PkgPath) != 0 {
continue
}
switch value.Kind() {
case reflect.Struct:
value.Set(reflect.Indirect(reflect.New(value.Type())))
if err := fillValues(ctx, value, structTag); err != nil {
return err
}
continue
case reflect.Ptr:
if value.IsNil() {
if value.Type().Elem().Kind() != reflect.Struct {
// nil pointer to a non-struct: leave it alone
break
}
// nil pointer to struct: create a zero instance
value.Set(reflect.New(value.Type().Elem()))
}
value = value.Elem()
if err := fillValues(ctx, value, structTag); err != nil {
return err
}
continue
}
tag, ok := field.Tag.Lookup(structTag)
if !ok {
continue
}
val, ok := os.LookupEnv(tag)
if !ok {
continue
}
if err := fillValue(ctx, value, val); err != nil {
return err
}
}
return nil
}
func (c *envConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
if err := config.DefaultBeforeSave(ctx, c); err != nil {
return err
}
if err := c.setValues(ctx, reflect.ValueOf(c.opts.Struct)); err != nil {
c.opts.Logger.Errorf(c.opts.Context, "env save error: %v", err)
if !c.opts.AllowFail {
return err
}
}
if err := config.DefaultAfterSave(ctx, c); err != nil {
return err
}
return nil
}
func (c *envConfig) String() string {
return "env"
}
func (c *envConfig) Name() string {
return c.opts.Name
}
func (c *envConfig) Watch(ctx context.Context, opts ...config.WatchOption) (config.Watcher, error) {
w := &envWatcher{
opts: c.opts,
wopts: config.NewWatchOptions(opts...),
done: make(chan struct{}),
vchan: make(chan map[string]interface{}),
echan: make(chan error),
}
go w.run()
return w, nil
}
func NewConfig(opts ...config.Option) config.Config {
options := config.NewOptions(opts...)
if len(options.StructTag) == 0 {
options.StructTag = DefaultStructTag
}
return &envConfig{opts: options}
}