unistack-org/micro-config-env
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add slice support

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Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
Василий Толстов 2020-12-04 21:52:21 +03:00
parent 7badb91465
commit 19fefe591c
2 changed files with 158 additions and 87 deletions
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118
env.go
View File

@ -4,12 +4,15 @@ import (
"github.com/unistack-org/micro/v3/config"
"context"
"reflect"
"strings"
"os"
"strconv"
"errors"
)
var (
DefaultStructTag = "env"
ErrInvalidStruct = errors.New("invalid struct specified")
)
type envConfig struct {
@ -29,24 +32,29 @@ func (c *envConfig) Init(opts...config.Option) error {
}
func (c *envConfig) Load(ctx context.Context) error {
fields := reflect.TypeOf(c.opts.Struct).Elem()
values := reflect.ValueOf(c.opts.Struct).Elem()
valueOf := reflect.ValueOf(c.opts.Struct)
for idx := 0; idx < fields.NumField(); idx++ {
field := fields.Field(idx)
value := values.Field(idx)
if !value.CanSet() {
continue
}
tag, ok := field.Tag.Lookup(c.opts.StructTag)
if !ok {
continue
}
val, ok := os.LookupEnv(tag)
if !ok {
continue
if err := c.fillValues(ctx, valueOf); err != nil {
return err
}
return nil
}
func (c *envConfig) fillValue(ctx context.Context, value reflect.Value, val string) error {
switch value.Kind() {
case reflect.Slice, reflect.Array:
nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
// value = value.Elem()
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 := c.fillValue(ctx, nvalue, nval); err != nil {
return err
}
value.Index(idx).Set(nvalue)
//value.Set(reflect.Append(value, nvalue))
}
case reflect.Bool:
v, err := strconv.ParseBool(val)
if err != nil {
@ -60,19 +68,19 @@ func (c *envConfig) Load(ctx context.Context) error {
if err != nil {
return err
}
value.Set(reflect.ValueOf(v))
value.Set(reflect.ValueOf(float32(v)))
case reflect.Float64:
v, err := strconv.ParseFloat(val, 64)
if err != nil {
return err
}
value.Set(reflect.ValueOf(v))
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(v))
value.Set(reflect.ValueOf(int(v)))
case reflect.Int8:
v, err := strconv.ParseInt(val, 10, 8)
if err != nil {
@ -84,49 +92,107 @@ func (c *envConfig) Load(ctx context.Context) error {
if err != nil {
return err
}
value.Set(reflect.ValueOf(v))
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(v))
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(v))
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(v))
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(v))
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(v))
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(v))
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(v))
value.Set(reflect.ValueOf(uint64(v)))
}
return nil
}
func (c *envConfig) fillValues(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 ErrInvalidStruct
}
// if values.Kind() != reflect.Struct {
// return c.fillValue(ctx, values)
// }
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
}
if value.Kind() == 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 := c.fillValues(ctx, value); err != nil {
return err
}
continue
}
tag, ok := field.Tag.Lookup(c.opts.StructTag)
if !ok {
return nil
}
val, ok := os.LookupEnv(tag)
if !ok {
return nil
}
if err := c.fillValue(ctx, value, val); err != nil {
return err
}
}

9
env_test.go
View File

@ -6,12 +6,14 @@ import (
"testing"
"context"
"os"
"fmt"
)
type Config struct {
StringValue string `env:"STRING_VALUE"`
BoolValue bool `env:"BOOL_VALUE"`
StringSlice []string `env:"STRING_SLICE"`
IntSlice []int `env:"INT_SLICE"`
}
func TestEnv(t *testing.T) {
@ -34,7 +36,8 @@ func TestEnv(t *testing.T) {
os.Setenv("STRING_VALUE","STRING_VALUE")
os.Setenv("BOOL_VALUE","true")
os.Setenv("STRING_SLICE", "STRING_SLICE1,STRING_SLICE2")
os.Setenv("STRING_SLICE", "STRING_SLICE1,STRING_SLICE2;STRING_SLICE3")
os.Setenv("INT_SLICE", "1,2,3,4,5")
if err := cfg.Load(ctx); err !=nil {
t.Fatal(err)
@ -47,7 +50,9 @@ func TestEnv(t *testing.T) {
t.Fatalf("something wrong with env config: %v", conf)
}
if len(conf.StringSlice) != 2 {
if len(conf.StringSlice) != 3 {
t.Fatalf("something wrong with env config: %v", conf)
}
fmt.Printf("%#+v\n", conf)
}