Repository: spf13/viper
Pull request #1111 (2021-04-07 01:36:04)

update %s to %w
I apologize for my rude pr on modify readme
I think it is better to use %w in fmt.Errorf instead of %s
[go error doc](https://golang.org/pkg/errors/)

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⏰ If you have a couple minutes, please take some time and share your thoughts: https://forms.gle/R6faU74qPRPAzchZ9

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**Thank you!** ❤️


Patch:
diff --git a/.github/workflows/wasm.yml b/.github/workflows/wasm.yml
new file mode 100644
index 0000000..333eb69
--- /dev/null
+++ b/.github/workflows/wasm.yml
@@ -0,0 +1,26 @@
+name: WASM
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    env:
+      GOFLAGS: -mod=readonly
+
+    steps:
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '1.16'
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Ensure Viper compiles for WASM
+        run: GOOS=js GOARCH=wasm go build .
diff --git a/.golangci.yml b/.golangci.yml
index a7b7381..4f970ac 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -16,6 +16,7 @@ linters:
         - deadcode
         - dogsled
         - dupl
+        - durationcheck
         - exhaustive
         - exportloopref
         - gci
@@ -23,29 +24,41 @@ linters:
         - gofmt
         - gofumpt
         - goimports
-        - golint
+        - gomoddirectives
         - goprintffuncname
         - govet
+        - importas
         - ineffassign
+        - makezero
         - misspell
         - nakedret
+        - nilerr
         - noctx
         - nolintlint
         - prealloc
+        - predeclared
+        - revive
         - rowserrcheck
         - sqlclosecheck
         - staticcheck
         - structcheck
         - stylecheck
+        - tparallel
         - typecheck
         - unconvert
         - unparam
         - unused
         - varcheck
+        - wastedassign
         - whitespace
 
         # fixme
+        # - cyclop
         # - errcheck
+        # - errorlint
+        # - exhaustivestruct
+        # - forbidigo
+        # - forcetypeassert
         # - gochecknoglobals
         # - gochecknoinits
         # - gocognit
@@ -54,9 +67,13 @@ linters:
         # - godot
         # - gosec
         # - gosimple
+        # - ifshort
         # - lll
         # - nlreturn
+        # - paralleltest
         # - scopelint
+        # - thelper
+        # - wrapcheck
 
         # unused
         # - depguard
diff --git a/Makefile b/Makefile
index b1796c9..b0f9acf 100644
--- a/Makefile
+++ b/Makefile
@@ -15,8 +15,8 @@ TEST_FORMAT = short-verbose
 endif
 
 # Dependency versions
-GOTESTSUM_VERSION = 0.5.3
-GOLANGCI_VERSION = 1.31.0
+GOTESTSUM_VERSION = 1.6.4
+GOLANGCI_VERSION = 1.40.1
 
 # Add the ability to override some variables
 # Use with care
diff --git a/README.md b/README.md
index 766537f..f409b15 100644
--- a/README.md
+++ b/README.md
@@ -119,7 +119,7 @@ viper.AddConfigPath("$HOME/.appname")  // call multiple times to add many search
 viper.AddConfigPath(".")               // optionally look for config in the working directory
 err := viper.ReadInConfig() // Find and read the config file
 if err != nil { // Handle errors reading the config file
-	panic(fmt.Errorf("Fatal error config file: %s \n", err))
+	panic(fmt.Errorf("Fatal error config file: %w \n", err))
 }
 ```
 
@@ -856,6 +856,9 @@ There has been several attempts to implement case sensitivity, but unfortunately
 
 You can vote for case sensitivity by filling out this feedback form: https://forms.gle/R6faU74qPRPAzchZ9
 
+### Is it safe to concurrently read and write to a viper?
+
+No, you will need to synchronize access to the viper yourself (for example by using the `sync` package). Concurrent reads and writes can cause a panic.
 
 ## Troubleshooting
 
diff --git a/go.mod b/go.mod
index 2fb5610..145e0a1 100644
--- a/go.mod
+++ b/go.mod
@@ -3,38 +3,19 @@ module github.com/spf13/viper
 go 1.12
 
 require (
-	github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c
-	github.com/coreos/bbolt v1.3.2 // indirect
-	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e // indirect
-	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
-	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
-	github.com/fsnotify/fsnotify v1.4.7
-	github.com/gogo/protobuf v1.2.1 // indirect
-	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
-	github.com/gorilla/websocket v1.4.2 // indirect
-	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
-	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway v1.9.0 // indirect
+	github.com/bketelsen/crypt v0.0.4
+	github.com/fsnotify/fsnotify v1.4.9
 	github.com/hashicorp/hcl v1.0.0
-	github.com/jonboulle/clockwork v0.1.0 // indirect
-	github.com/magiconair/properties v1.8.1
-	github.com/mitchellh/mapstructure v1.3.3
-	github.com/pelletier/go-toml v1.2.0
-	github.com/prometheus/client_golang v0.9.3 // indirect
+	github.com/magiconair/properties v1.8.5
+	github.com/mitchellh/mapstructure v1.4.1
+	github.com/pelletier/go-toml v1.9.3
 	github.com/smartystreets/goconvey v1.6.4 // indirect
-	github.com/soheilhy/cmux v0.1.4 // indirect
-	github.com/spf13/afero v1.5.1
-	github.com/spf13/cast v1.3.0
-	github.com/spf13/jwalterweatherman v1.0.0
-	github.com/spf13/pflag v1.0.3
-	github.com/stretchr/testify v1.4.0
+	github.com/spf13/afero v1.6.0
+	github.com/spf13/cast v1.3.1
+	github.com/spf13/jwalterweatherman v1.1.0
+	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.7.0
 	github.com/subosito/gotenv v1.2.0
-	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
-	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
-	go.etcd.io/bbolt v1.3.2 // indirect
-	go.uber.org/atomic v1.4.0 // indirect
-	go.uber.org/multierr v1.1.0 // indirect
-	go.uber.org/zap v1.10.0 // indirect
-	gopkg.in/ini.v1 v1.51.0
-	gopkg.in/yaml.v2 v2.2.4
+	gopkg.in/ini.v1 v1.62.0
+	gopkg.in/yaml.v2 v2.4.0
 )
diff --git a/go.sum b/go.sum
index ed04a58..27730e2 100644
--- a/go.sum
+++ b/go.sum
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-cloud.google.com/go/bigquery v1.0.1 h1:hL+ycaJpVE9M7nLoiXb/Pn10ENE2u+oddxbD8uu0ZVU=
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diff --git a/viper.go b/viper.go
index 6d149f6..60f9868 100644
--- a/viper.go
+++ b/viper.go
@@ -176,6 +176,8 @@ func DecodeHook(hook mapstructure.DecodeHookFunc) DecoderConfigOption {
 //		"user": "root",
 //		"endpoint": "https://localhost"
 //	}
+//
+// Note: Vipers are not safe for concurrent Get() and Set() operations.
 type Viper struct {
 	// Delimiter that separates a list of keys
 	// used to access a nested value in one go
@@ -197,6 +199,9 @@ type Viper struct {
 	configPermissions os.FileMode
 	envPrefix         string
 
+	// Specific commands for ini parsing
+	iniLoadOptions ini.LoadOptions
+
 	automaticEnvApplied bool
 	envKeyReplacer      StringReplacer
 	allowEmptyEnv       bool
@@ -342,7 +347,7 @@ func (v *Viper) WatchConfig() {
 	initWG := sync.WaitGroup{}
 	initWG.Add(1)
 	go func() {
-		watcher, err := fsnotify.NewWatcher()
+		watcher, err := newWatcher()
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -1635,7 +1640,7 @@ func (v *Viper) unmarshalReader(in io.Reader, c map[string]interface{}) error {
 		}
 
 	case "ini":
-		cfg := ini.Empty()
+		cfg := ini.Empty(v.iniLoadOptions)
 		err := cfg.Append(buf.Bytes())
 		if err != nil {
 			return ConfigParseError{err}
@@ -1824,7 +1829,7 @@ func mergeMaps(
 
 		svType := reflect.TypeOf(sv)
 		tvType := reflect.TypeOf(tv)
-		if svType != tvType {
+		if tvType != nil && svType != tvType { // Allow for the target to be nil
 			jww.ERROR.Printf(
 				"svType != tvType; key=%s, st=%v, tt=%v, sv=%v, tv=%v",
 				sk, svType, tvType, sv, tv)
@@ -2079,6 +2084,13 @@ func (v *Viper) SetConfigPermissions(perm os.FileMode) {
 	v.configPermissions = perm.Perm()
 }
 
+// IniLoadOptions sets the load options for ini parsing.
+func IniLoadOptions(in ini.LoadOptions) Option {
+	return optionFunc(func(v *Viper) {
+		v.iniLoadOptions = in
+	})
+}
+
 func (v *Viper) getConfigType() string {
 	if v.configType != "" {
 		return v.configType
diff --git a/watch.go b/watch.go
new file mode 100644
index 0000000..c433a8f
--- /dev/null
+++ b/watch.go
@@ -0,0 +1,11 @@
+// +build !js
+
+package viper
+
+import "github.com/fsnotify/fsnotify"
+
+type watcher = fsnotify.Watcher
+
+func newWatcher() (*watcher, error) {
+	return fsnotify.NewWatcher()
+}
diff --git a/watch_wasm.go b/watch_wasm.go
new file mode 100644
index 0000000..8e47e6a
--- /dev/null
+++ b/watch_wasm.go
@@ -0,0 +1,30 @@
+// +build js,wasm
+
+package viper
+
+import (
+	"errors"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+type watcher struct {
+	Events chan fsnotify.Event
+	Errors chan error
+}
+
+func (*watcher) Close() error {
+	return nil
+}
+
+func (*watcher) Add(name string) error {
+	return nil
+}
+
+func (*watcher) Remove(name string) error {
+	return nil
+}
+
+func newWatcher() (*watcher, error) {
+	return &watcher{}, errors.New("fsnotify is not supported on WASM")
+}


Test patch:
diff --git a/util_test.go b/util_test.go
index a377d5b..941d8a2 100644
--- a/util_test.go
+++ b/util_test.go
@@ -23,16 +23,14 @@ func TestCopyAndInsensitiviseMap(t *testing.T) {
 	var (
 		given = map[string]interface{}{
 			"Foo": 32,
-			"Bar": map[interface{}]interface {
-			}{
+			"Bar": map[interface{}]interface{}{
 				"ABc": "A",
 				"cDE": "B",
 			},
 		}
 		expected = map[string]interface{}{
 			"foo": 32,
-			"bar": map[string]interface {
-			}{
+			"bar": map[string]interface{}{
 				"abc": "A",
 				"cde": "B",
 			},
diff --git a/viper_test.go b/viper_test.go
index 45bf8e9..f748c7a 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -1695,6 +1695,7 @@ hello:
     pop: 37890
     largenum: 765432101234567
     num2pow63: 9223372036854775808
+    universe: null
     world:
     - us
     - uk
@@ -1992,8 +1993,7 @@ func TestCaseInsensitiveSet(t *testing.T) {
 	Reset()
 	m1 := map[string]interface{}{
 		"Foo": 32,
-		"Bar": map[interface{}]interface {
-		}{
+		"Bar": map[interface{}]interface{}{
 			"ABc": "A",
 			"cDE": "B",
 		},
@@ -2001,8 +2001,7 @@ func TestCaseInsensitiveSet(t *testing.T) {
 
 	m2 := map[string]interface{}{
 		"Foo": 52,
-		"Bar": map[interface{}]interface {
-		}{
+		"Bar": map[interface{}]interface{}{
 			"bCd": "A",
 			"eFG": "B",
 		},