Merge pull request #9 from tiburon-777/hw08_zenv_to_structure

HW8.1 is completed

.golangci.yml

@@ -15,3 +15,4 @@ linters:
     - wsl
     - gofumpt
     - gosec
+    - nlreturn

hw08_envdir_tool/go.sum

@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

hw08_zenv_to_structure/README.md

@@ -0,0 +1,3 @@
+## Домашнее задание №8_1 «Рефлексия» 
+
+Реализовать функцию, заполняющую структуру значениями из переменных окружения.

hw08_zenv_to_structure/env_to_struct.go

@@ -0,0 +1,57 @@
+package hw08_zenv_to_structure //nolint:golint,stylecheck
+import (
+	"fmt"
+	"log"
+	"os"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+func Slice2struct(mp []string, str interface{}) error {
+	v := reflect.ValueOf(str)
+	if v.Kind() != reflect.Ptr {
+		return fmt.Errorf("%T is not a pointer", str)
+	}
+	v = v.Elem()
+	if v.Kind() != reflect.Struct {
+		return fmt.Errorf("%T is not a pointer to struct", str)
+	}
+
+	for _, e := range mp {
+		st := strings.Split(e, "=")
+		var key string = st[0]
+		var value interface{} = st[1]
+		f := v.FieldByName(key)
+		if f.IsValid() && f.CanSet() {
+			switch v := f.Interface().(type) {
+			case int:
+				val, err := strconv.Atoi(value.(string))
+				if err != nil {
+					return err
+				}
+				x := int64(val)
+				if !f.OverflowInt(x) {
+					f.SetInt(x)
+				}
+			case string:
+				f.SetString(value.(string))
+			case bool:
+				f.SetBool(value.(string) == "true")
+			case []interface{}:
+				input := reflect.ValueOf(value)
+				f.Set(input)
+			default:
+				return fmt.Errorf("i don't know how to parse type %T", v)
+			}
+		}
+	}
+	return nil
+}
+
+func Env2struct(s interface{}) {
+	env := os.Environ()
+	if err := Slice2struct(env, s); err != nil {
+		log.Fatal("ошибка", err.Error())
+	}
+}

hw08_zenv_to_structure/env_to_struct_test.go

@@ -0,0 +1,46 @@
+package hw08_zenv_to_structure
+
+import (
+	"github.com/stretchr/testify/require"
+	"log"
+	"os"
+	"testing"
+)
+
+func TestSlice2struct(t *testing.T) {
+	mp := []string{"ENV1=fsfsdvsvssdfsd fsf fsf sds", "ENV2=12345", "ENV3=aefrsgrgdtgtdhn"}
+	var st struct {
+		ENV1 string
+		ENV2 int
+		ENV3 string
+	}
+	err := Slice2struct(mp, &st)
+	require.Equal(t, struct {
+		ENV1 string
+		ENV2 int
+		ENV3 string
+	}{"fsfsdvsvssdfsd fsf fsf sds", 12345, "aefrsgrgdtgtdhn"}, st)
+	require.NoError(t, err)
+}
+
+func TestEnv2struct(t *testing.T) {
+	type env struct {
+		ENV1 string
+		ENV2 bool
+		ENV3 int
+	}
+	exp := env{"какая-то строка", true, 1234567}
+	if os.Setenv("ENV1", "какая-то строка") != nil {
+		log.Fatal("не удалось установить ENV")
+	}
+	if os.Setenv("ENV2", "true") != nil {
+		log.Fatal("не удалось установить ENV")
+	}
+	if os.Setenv("ENV3", "1234567") != nil {
+		log.Fatal("не удалось установить ENV")
+	}
+
+	var res env
+	Env2struct(&res)
+	require.Equal(t, exp, res)
+}

hw08_zenv_to_structure/go.mod

@@ -0,0 +1,5 @@
+module github.com/tiburon-777/HW_OTUS/hw08_zenv_to_structure
+
+go 1.14
+
+require github.com/stretchr/testify v1.6.1