error if environment variables has not been replaced

.gitignore

@@ -1,2 +1,3 @@
 ./configs/local.toml
 *.coverprofile
+.envrc.local.sh

go.mod

@@ -3,17 +3,19 @@ module github.com/beckend/go-config
 go 1.16
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/evanphx/json-patch v0.5.2
 	github.com/fatih/color v1.12.0
 	github.com/go-playground/validator/v10 v10.6.1
-	github.com/gookit/goutil v0.3.13
+	github.com/gookit/goutil v0.3.14
+	github.com/jeremywohl/flatten v1.0.1 // indirect
 	github.com/json-iterator/go v1.1.11
 	github.com/kr/pretty v0.2.0 // indirect
 	github.com/mileusna/conditional v0.5.0
 	github.com/mitchellh/mapstructure v1.4.1
-	github.com/onsi/ginkgo v1.16.2
-	github.com/onsi/gomega v1.12.0
-	github.com/pelletier/go-toml v1.9.1
+	github.com/onsi/ginkgo v1.16.4
+	github.com/onsi/gomega v1.13.0
+	github.com/pelletier/go-toml v1.9.3
 	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a // indirect
 	golang.org/x/net v0.0.0-20210510120150-4163338589ed // indirect
 	golang.org/x/sys v0.0.0-20210521203332-0cec03c779c1 // indirect

go.sum

@@ -3,8 +3,6 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/evanphx/json-patch v0.5.2 h1:xVCHIVMUu1wtM/VkR9jVZ45N3FhZfYMMYGorLCR8P3k=
 github.com/evanphx/json-patch v0.5.2/go.mod h1:ZWS5hhDbVDyob71nXKNL0+PWn6ToqBHMikGIFbs31qQ=
-github.com/fatih/color v1.11.0 h1:l4iX0RqNnx/pU7rY2DB/I+znuYY0K3x6Ywac6EIr0PA=
-github.com/fatih/color v1.11.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/fatih/color v1.12.0 h1:mRhaKNwANqRgUBGKmnI5ZxEk7QXmjQeCcuYFMX2bfcc=
 github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
@@ -39,7 +37,11 @@ github.com/gookit/color v1.4.2 h1:tXy44JFSFkKnELV6WaMo/lLfu/meqITX3iAV52do7lk=
 github.com/gookit/color v1.4.2/go.mod h1:fqRyamkC1W8uxl+lxCQxOT09l/vYfZ+QeiX3rKQHCoQ=
 github.com/gookit/goutil v0.3.13 h1:jdjuMjFwtcDeyYPyzwivs6ksVRGHhNjRIDfXViX8Mrc=
 github.com/gookit/goutil v0.3.13/go.mod h1:DdrxLZc3yakbuElOtTH8F2SWu3XhaJohgvKHSP0JRak=
+github.com/gookit/goutil v0.3.14 h1:ZEdZR+Vkvcjz0SSC0MpjtD+Kwlg/uagpiddh6L2ko+0=
+github.com/gookit/goutil v0.3.14/go.mod h1:YdGV0ObqRUlRq4/RzAQBHcd1Wzl/jKw7cppDBtD3q+U=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/jeremywohl/flatten v1.0.1 h1:LrsxmB3hfwJuE+ptGOijix1PIfOoKLJ3Uee/mzbgtrs=
+github.com/jeremywohl/flatten v1.0.1/go.mod h1:4AmD/VxjWcI5SRB0n6szE2A6s2fsNHDLO0nAlMHgfLQ=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/json-iterator/go v1.1.11 h1:uVUAXhF2To8cbw/3xN3pxj6kk7TYKs98NIrTqPlMWAQ=
@@ -74,12 +76,18 @@ github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+W
 github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
 github.com/onsi/ginkgo v1.16.2 h1:HFB2fbVIlhIfCfOW81bZFbiC/RvnpXSdhbF2/DJr134=
 github.com/onsi/ginkgo v1.16.2/go.mod h1:CObGmKUOKaSC0RjmoAK7tKyn4Azo5P2IWuoMnvwxz1E=
+github.com/onsi/ginkgo v1.16.4 h1:29JGrr5oVBm5ulCWet69zQkzWipVXIol6ygQUe/EzNc=
+github.com/onsi/ginkgo v1.16.4/go.mod h1:dX+/inL/fNMqNlz0e9LfyB9TswhZpCVdJM/Z6Vvnwo0=
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/onsi/gomega v1.12.0 h1:p4oGGk2M2UJc0wWN4lHFvIB71lxsh0T/UiKCCgFADY8=
 github.com/onsi/gomega v1.12.0/go.mod h1:lRk9szgn8TxENtWd0Tp4c3wjlRfMTMH27I+3Je41yGY=
+github.com/onsi/gomega v1.13.0 h1:7lLHu94wT9Ij0o6EWWclhu0aOh32VxhkwEJvzuWPeak=
+github.com/onsi/gomega v1.13.0/go.mod h1:lRk9szgn8TxENtWd0Tp4c3wjlRfMTMH27I+3Je41yGY=
 github.com/pelletier/go-toml v1.9.1 h1:a6qW1EVNZWH9WGI6CsYdD8WAylkoXBS5yv0XHlh17Tc=
 github.com/pelletier/go-toml v1.9.1/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
+github.com/pelletier/go-toml v1.9.3 h1:zeC5b1GviRUyKYd6OJPvBU/mcVDVoL1OhT17FCt5dSQ=
+github.com/pelletier/go-toml v1.9.3/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

main.go

@@ -3,19 +3,22 @@ package config
 
 import (
 	errors "errors"
+	fmt "fmt"
 	io "io"
 	fs "io/fs"
 	os "os"
 	path "path"
 	reflect "reflect"
+	strings "strings"
 
 	environment "github.com/beckend/go-config/pkg/environment"
 	file "github.com/beckend/go-config/pkg/file"
-	"github.com/beckend/go-config/pkg/reflection"
+	reflection "github.com/beckend/go-config/pkg/reflection"
 	singletons "github.com/beckend/go-config/pkg/singletons"
 	validation "github.com/beckend/go-config/pkg/validation"
 	walkertype "github.com/beckend/go-config/pkg/walker-type"
 	validator "github.com/go-playground/validator/v10"
+	flatten "github.com/jeremywohl/flatten"
 
 	envutil "github.com/gookit/goutil/envutil"
 	jsoniter "github.com/json-iterator/go"
@@ -173,6 +176,10 @@ func New(options *NewOptions) (*Config, error) {
 			err = nil
 		}
 
+		if err == nil {
+			err = validateStructNoUnmappedEnvVariables(options.ConfigUnmarshal)
+		}
+
 		return &Config{
 			ErrorsValidation: errsValidation,
 		}, err
@@ -182,3 +189,27 @@ func New(options *NewOptions) (*Config, error) {
 		ErrorsValidation: nil,
 	}, err
 }
+
+func validateStructNoUnmappedEnvVariables(input interface{}) (err error) {
+	var interfaceMapped map[string]interface{}
+	inrec, err := json.Marshal(input)
+	if err != nil {
+		return err
+	}
+	err = json.Unmarshal(inrec, &interfaceMapped)
+	if err != nil {
+		return err
+	}
+
+	interfaceFlat, err := flatten.Flatten(interfaceMapped, "", flatten.DotStyle)
+
+	for key, value := range interfaceFlat {
+		valueString := fmt.Sprintf("%v", value)
+		if strings.HasPrefix(valueString, "${") && strings.HasSuffix(valueString, "}") {
+			fmt.Printf("key: %s - environment variable not replaced: %s\n", key, valueString)
+			err = errors.New("validation failed due to missing replacement(s) of environment variable")
+		}
+	}
+
+	return err
+}

main_test.go

@@ -37,6 +37,18 @@ type TestValidateStructOneFail struct {
 	RunEnV     string `validate:"required"`
 }
 
+type TestValidateStructMissingEnv struct {
+	RunEnV string `validate:"required"`
+	Ntest1 struct {
+		Nest2 struct {
+			Value1 string `validate:"required"`
+			Nest3  struct {
+				Value2 string `validate:"required"`
+			}
+		}
+	}
+}
+
 var _ = Describe("pkg main", func() {
 	_, pathCurrentFile, _, _ := runtime.Caller(0)
 	pathDirCurrent, _ := filepath.Split(pathCurrentFile)
@@ -215,6 +227,18 @@ var _ = Describe("pkg main", func() {
 				})
 			})
 
+			When("struct", func() {
+				It("local.toml has the last word.", func() {
+					var result TestValidateStructMissingEnv
+					_, err := config.New(&config.NewOptions{
+						ConfigUnmarshal: &result,
+						PathConfigs:     path.Join(pathFixtures, "configs-env-not-replaced"),
+					})
+
+					Expect(err.Error()).To(ContainSubstring("missing replacement"))
+				})
+			})
+
 			When("configs-custom test1.toml", func() {
 				It("works", func() {
 					var result map[string]interface{}

tests/fixtures/configs-env-not-replaced/base.toml

@@ -0,0 +1,5 @@
+RunEnv = '${_THIS_SHOULD_NOT_EXIST}'
+[Ntest1.Nest2]
+Value1 = "${_THIS_SHOULD_NOT_EXIST}"
+[Ntest1.Nest2.Nest3]
+Value2 = "${_THIS_SHOULD_NOT_EXIST}"