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Merge pull request #675 from harshavardhana/pr_out_import_quick_key_value_store_from_minio_client_for_persistent_state_files_primarily_for_donut

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Import quick key value store from Minio Client for persistent state files, primarily for donut
This commit is contained in:
Harshavardhana 2015-06-26 02:59:28 +00:00
commit 0cb3f76a91
14 changed files with 2740 additions and 0 deletions
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Godeps/Godeps.json generated
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"ImportPath": "github.com/dustin/go-humanize",
"Rev": "8cc1aaa2d955ee82833337cfb10babc42be6bce6"
},
{
"ImportPath": "github.com/fatih/structs",
"Rev": "c00d27128bb88e9c1adab1a53cda9c72c6d1ff9b"
},
{
"ImportPath": "github.com/gorilla/context",
"Rev": "50c25fb3b2b3b3cc724e9b6ac75fb44b3bccd0da"

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Godeps/_workspace/src/github.com/fatih/structs/.gitignore generated vendored Normal file
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test

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Godeps/_workspace/src/github.com/fatih/structs/.travis.yml generated vendored Normal file
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language: go
go: 1.3
before_install:
- go get github.com/axw/gocov/gocov
- go get github.com/mattn/goveralls
- go get code.google.com/p/go.tools/cmd/cover
script:
- $HOME/gopath/bin/goveralls -repotoken $COVERALLS_TOKEN
env:
global:
- secure: hkc+92KPmMFqIH9n4yWdnH1JpZjahmOyDJwpTh8Yl0JieJNG0XEXpOqNao27eA0cLF+UHdyjFeGcPUJKNmgE46AoQjtovt+ICjCXKR2yF6S2kKJcUOz/Vd6boZF7qHV06jjxyxOebpID5iSoW6UfFr001bFxpd3jaSLFTzSHWRQ=

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Godeps/_workspace/src/github.com/fatih/structs/LICENSE generated vendored Normal file
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The MIT License (MIT)
Copyright (c) 2014 Fatih Arslan
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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Godeps/_workspace/src/github.com/fatih/structs/README.md generated vendored Normal file
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# Structs [![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](http://godoc.org/github.com/fatih/structs) [![Build Status](http://img.shields.io/travis/fatih/structs.svg?style=flat-square)](https://travis-ci.org/fatih/structs) [![Coverage Status](http://img.shields.io/coveralls/fatih/structs.svg?style=flat-square)](https://coveralls.io/r/fatih/structs)
Structs contains various utilities to work with Go (Golang) structs. It was
initially used by me to convert a struct into a `map[string]interface{}`. With
time I've added other utilities for structs. It's basically a high level
package based on primitives from the reflect package. Feel free to add new
functions or improve the existing code.
## Install
```bash
go get github.com/fatih/structs
```
## Usage and Examples
Just like the standard lib `strings`, `bytes` and co packages, `structs` has
many global functions to manipulate or organize your struct data. Lets define
and declare a struct:
```go
type Server struct {
Name string `json:"name,omitempty"`
ID int
Enabled bool
users []string // not exported
http.Server // embedded
}
server := &Server{
Name: "gopher",
ID: 123456,
Enabled: true,
}
```
```go
// Convert a struct to a map[string]interface{}
// => {"Name":"gopher", "ID":123456, "Enabled":true}
m := structs.Map(server)
// Convert the values of a struct to a []interface{}
// => ["gopher", 123456, true]
v := structs.Values(server)
// Convert the values of a struct to a []*Field
// (see "Field methods" for more info about fields)
f := structs.Fields(server)
// Return the struct name => "Server"
n := structs.Name(server)
// Check if any field of a struct is initialized or not.
h := structs.HasZero(server)
// Check if all fields of a struct is initialized or not.
z := structs.IsZero(server)
// Check if server is a struct or a pointer to struct
i := structs.IsStruct(server)
```
### Struct methods
The structs functions can be also used as independent methods by creating a new
`*structs.Struct`. This is handy if you want to have more control over the
structs (such as retrieving a single Field).
```go
// Create a new struct type:
s := structs.New(server)
m := s.Map() // Get a map[string]interface{}
v := s.Values() // Get a []interface{}
f := s.Fields() // Get a []*Field
f := s.Field(name) // Get a *Field based on the given field name
f, ok := s.FieldsOk(name) // Get a *Field based on the given field name
n := s.Name() // Get the struct name
h := s.HasZero() // Check if any field is initialized
z := s.IsZero() // Check if all fields are initialized
```
### Field methods
We can easily examine a single Field for more detail. Below you can see how we
get and interact with various field methods:
```go
s := structs.New(server)
// Get the Field struct for the "Name" field
name := s.Field("Name")
// Get the underlying value, value => "gopher"
value := name.Value().(string)
// Set the field's value
name.Set("another gopher")
// Get the field's kind, kind => "string"
name.Kind()
// Check if the field is exported or not
if name.IsExported() {
fmt.Println("Name field is exported")
}
// Check if the value is a zero value, such as "" for string, 0 for int
if !name.IsZero() {
fmt.Println("Name is initialized")
}
// Check if the field is an anonymous (embedded) field
if !name.IsEmbedded() {
fmt.Println("Name is not an embedded field")
}
// Get the Field's tag value for tag name "json", tag value => "name,omitempty"
tagValue := name.Tag("json")
```
Nested structs are supported too:
```go
addrField := s.Field("Server").Field("Addr")
// Get the value for addr
a := addrField.Value().(string)
// Or get all fields
httpServer := s.Field("Server").Fields()
```
We can also get a slice of Fields from the Struct type to iterate over all
fields. This is handy if you wish to examine all fields:
```go
// Convert the fields of a struct to a []*Field
fields := s.Fields()
for _, f := range fields {
fmt.Printf("field name: %+v\n", f.Name())
if f.IsExported() {
fmt.Printf("value : %+v\n", f.Value())
fmt.Printf("is zero : %+v\n", f.IsZero())
}
}
```
## Credits
* [Fatih Arslan](https://github.com/fatih)
* [Cihangir Savas](https://github.com/cihangir)
## License
The MIT License (MIT) - see LICENSE.md for more details

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Godeps/_workspace/src/github.com/fatih/structs/field.go generated vendored Normal file
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package structs
import (
"errors"
"fmt"
"reflect"
)
var (
errNotExported = errors.New("field is not exported")
errNotSettable = errors.New("field is not settable")
)
// Field represents a single struct field that encapsulates high level
// functions around the field.
type Field struct {
value reflect.Value
field reflect.StructField
defaultTag string
}
// Tag returns the value associated with key in the tag string. If there is no
// such key in the tag, Tag returns the empty string.
func (f *Field) Tag(key string) string {
return f.field.Tag.Get(key)
}
// Value returns the underlying value of of the field. It panics if the field
// is not exported.
func (f *Field) Value() interface{} {
return f.value.Interface()
}
// IsEmbedded returns true if the given field is an anonymous field (embedded)
func (f *Field) IsEmbedded() bool {
return f.field.Anonymous
}
// IsExported returns true if the given field is exported.
func (f *Field) IsExported() bool {
return f.field.PkgPath == ""
}
// IsZero returns true if the given field is not initalized (has a zero value).
// It panics if the field is not exported.
func (f *Field) IsZero() bool {
zero := reflect.Zero(f.value.Type()).Interface()
current := f.Value()
return reflect.DeepEqual(current, zero)
}
// Name returns the name of the given field
func (f *Field) Name() string {
return f.field.Name
}
// Kind returns the fields kind, such as "string", "map", "bool", etc ..
func (f *Field) Kind() reflect.Kind {
return f.value.Kind()
}
// Set sets the field to given value v. It retuns an error if the field is not
// settable (not addresable or not exported) or if the given value's type
// doesn't match the fields type.
func (f *Field) Set(val interface{}) error {
// we can't set unexported fields, so be sure this field is exported
if !f.IsExported() {
return errNotExported
}
// do we get here? not sure...
if !f.value.CanSet() {
return errNotSettable
}
given := reflect.ValueOf(val)
if f.value.Kind() != given.Kind() {
return fmt.Errorf("wrong kind. got: %s want: %s", given.Kind(), f.value.Kind())
}
f.value.Set(given)
return nil
}
// Fields returns a slice of Fields. This is particular handy to get the fields
// of a nested struct . A struct tag with the content of "-" ignores the
// checking of that particular field. Example:
//
// // Field is ignored by this package.
// Field *http.Request `structs:"-"`
//
// It panics if field is not exported or if field's kind is not struct
func (f *Field) Fields() []*Field {
return getFields(f.value, f.defaultTag)
}
// Field returns the field from a nested struct. It panics if the nested struct
// is not exported or if the field was not found.
func (f *Field) Field(name string) *Field {
field, ok := f.FieldOk(name)
if !ok {
panic("field not found")
}
return field
}
// Field returns the field from a nested struct. The boolean returns true if
// the field was found. It panics if the nested struct is not exported or if
// the field was not found.
func (f *Field) FieldOk(name string) (*Field, bool) {
v := strctVal(f.value.Interface())
t := v.Type()
field, ok := t.FieldByName(name)
if !ok {
return nil, false
}
return &Field{
field: field,
value: v.FieldByName(name),
}, true
}

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package structs
import (
"reflect"
"testing"
)
// A test struct that defines all cases
type Foo struct {
A string
B int `structs:"y"`
C bool `json:"c"`
d string // not exported
E *Baz
x string `xml:"x"` // not exported, with tag
Y []string
Z map[string]interface{}
*Bar // embedded
}
type Baz struct {
A string
B int
}
type Bar struct {
E string
F int
g []string
}
func newStruct() *Struct {
b := &Bar{
E: "example",
F: 2,
g: []string{"zeynep", "fatih"},
}
// B and x is not initialized for testing
f := &Foo{
A: "gopher",
C: true,
d: "small",
E: nil,
Y: []string{"example"},
Z: nil,
}
f.Bar = b
return New(f)
}
func TestField_Set(t *testing.T) {
s := newStruct()
f := s.Field("A")
err := f.Set("fatih")
if err != nil {
t.Error(err)
}
if f.Value().(string) != "fatih" {
t.Errorf("Setted value is wrong: %s want: %s", f.Value().(string), "fatih")
}
f = s.Field("Y")
err = f.Set([]string{"override", "with", "this"})
if err != nil {
t.Error(err)
}
sliceLen := len(f.Value().([]string))
if sliceLen != 3 {
t.Errorf("Setted values slice length is wrong: %d, want: %d", sliceLen, 3)
}
f = s.Field("C")
err = f.Set(false)
if err != nil {
t.Error(err)
}
if f.Value().(bool) {
t.Errorf("Setted value is wrong: %s want: %s", f.Value().(bool), false)
}
// let's pass a different type
f = s.Field("A")
err = f.Set(123) // Field A is of type string, but we are going to pass an integer
if err == nil {
t.Error("Setting a field's value with a different type than the field's type should return an error")
}
// old value should be still there :)
if f.Value().(string) != "fatih" {
t.Errorf("Setted value is wrong: %s want: %s", f.Value().(string), "fatih")
}
// let's access an unexported field, which should give an error
f = s.Field("d")
err = f.Set("large")
if err != errNotExported {
t.Error(err)
}
// let's set a pointer to struct
b := &Bar{
E: "gopher",
F: 2,
}
f = s.Field("Bar")
err = f.Set(b)
if err != nil {
t.Error(err)
}
baz := &Baz{
A: "helloWorld",
B: 42,
}
f = s.Field("E")
err = f.Set(baz)
if err != nil {
t.Error(err)
}
ba := s.Field("E").Value().(*Baz)
if ba.A != "helloWorld" {
t.Errorf("could not set baz. Got: %s Want: helloWorld", ba.A)
}
}
func TestField(t *testing.T) {
s := newStruct()
defer func() {
err := recover()
if err == nil {
t.Error("Retrieveing a non existing field from the struct should panic")
}
}()
_ = s.Field("no-field")
}
func TestField_Kind(t *testing.T) {
s := newStruct()
f := s.Field("A")
if f.Kind() != reflect.String {
t.Errorf("Field A has wrong kind: %s want: %s", f.Kind(), reflect.String)
}
f = s.Field("B")
if f.Kind() != reflect.Int {
t.Errorf("Field B has wrong kind: %s want: %s", f.Kind(), reflect.Int)
}
// unexported
f = s.Field("d")
if f.Kind() != reflect.String {
t.Errorf("Field d has wrong kind: %s want: %s", f.Kind(), reflect.String)
}
}
func TestField_Tag(t *testing.T) {
s := newStruct()
v := s.Field("B").Tag("json")
if v != "" {
t.Errorf("Field's tag value of a non existing tag should return empty, got: %s", v)
}
v = s.Field("C").Tag("json")
if v != "c" {
t.Errorf("Field's tag value of the existing field C should return 'c', got: %s", v)
}
v = s.Field("d").Tag("json")
if v != "" {
t.Errorf("Field's tag value of a non exported field should return empty, got: %s", v)
}
v = s.Field("x").Tag("xml")
if v != "x" {
t.Errorf("Field's tag value of a non exported field with a tag should return 'x', got: %s", v)
}
v = s.Field("A").Tag("json")
if v != "" {
t.Errorf("Field's tag value of a existing field without a tag should return empty, got: %s", v)
}
}
func TestField_Value(t *testing.T) {
s := newStruct()
v := s.Field("A").Value()
val, ok := v.(string)
if !ok {
t.Errorf("Field's value of a A should be string")
}
if val != "gopher" {
t.Errorf("Field's value of a existing tag should return 'gopher', got: %s", val)
}
defer func() {
err := recover()
if err == nil {
t.Error("Value of a non exported field from the field should panic")
}
}()
// should panic
_ = s.Field("d").Value()
}
func TestField_IsEmbedded(t *testing.T) {
s := newStruct()
if !s.Field("Bar").IsEmbedded() {
t.Errorf("Fields 'Bar' field is an embedded field")
}
if s.Field("d").IsEmbedded() {
t.Errorf("Fields 'd' field is not an embedded field")
}
}
func TestField_IsExported(t *testing.T) {
s := newStruct()
if !s.Field("Bar").IsExported() {
t.Errorf("Fields 'Bar' field is an exported field")
}
if !s.Field("A").IsExported() {
t.Errorf("Fields 'A' field is an exported field")
}
if s.Field("d").IsExported() {
t.Errorf("Fields 'd' field is not an exported field")
}
}
func TestField_IsZero(t *testing.T) {
s := newStruct()
if s.Field("A").IsZero() {
t.Errorf("Fields 'A' field is an initialized field")
}
if !s.Field("B").IsZero() {
t.Errorf("Fields 'B' field is not an initialized field")
}
}
func TestField_Name(t *testing.T) {
s := newStruct()
if s.Field("A").Name() != "A" {
t.Errorf("Fields 'A' field should have the name 'A'")
}
}
func TestField_Field(t *testing.T) {
s := newStruct()
e := s.Field("Bar").Field("E")
val, ok := e.Value().(string)
if !ok {
t.Error("The value of the field 'e' inside 'Bar' struct should be string")
}
if val != "example" {
t.Errorf("The value of 'e' should be 'example, got: %s", val)
}
defer func() {
err := recover()
if err == nil {
t.Error("Field of a non existing nested struct should panic")
}
}()
_ = s.Field("Bar").Field("e")
}
func TestField_Fields(t *testing.T) {
s := newStruct()
fields := s.Field("Bar").Fields()
if len(fields) != 3 {
t.Errorf("We expect 3 fields in embedded struct, was: %d", len(fields))
}
}
func TestField_FieldOk(t *testing.T) {
s := newStruct()
b, ok := s.FieldOk("Bar")
if !ok {
t.Error("The field 'Bar' should exists.")
}
e, ok := b.FieldOk("E")
if !ok {
t.Error("The field 'E' should exists.")
}
val, ok := e.Value().(string)
if !ok {
t.Error("The value of the field 'e' inside 'Bar' struct should be string")
}
if val != "example" {
t.Errorf("The value of 'e' should be 'example, got: %s", val)
}
}

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// Package structs contains various utilities functions to work with structs.
package structs
import "reflect"
var (
// DefaultTagName is the default tag name for struct fields which provides
// a more granular to tweak certain structs. Lookup the necessary functions
// for more info.
DefaultTagName = "structs" // struct's field default tag name
)
// Struct encapsulates a struct type to provide several high level functions
// around the struct.
type Struct struct {
raw interface{}
value reflect.Value
TagName string
}
// New returns a new *Struct with the struct s. It panics if the s's kind is
// not struct.
func New(s interface{}) *Struct {
return &Struct{
raw: s,
value: strctVal(s),
TagName: DefaultTagName,
}
}
// Map converts the given struct to a map[string]interface{}, where the keys
// of the map are the field names and the values of the map the associated
// values of the fields. The default key string is the struct field name but
// can be changed in the struct field's tag value. The "structs" key in the
// struct's field tag value is the key name. Example:
//
// // Field appears in map as key "myName".
// Name string `structs:"myName"`
//
// A tag value with the content of "-" ignores that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// A tag value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Field is not processed further by this package.
// Field time.Time `structs:"myName,omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// A tag value with the option of "omitempty" ignores that particular field if
// the field value is empty. Example:
//
// // Field appears in map as key "myName", but the field is
// // skipped if empty.
// Field string `structs:"myName,omitempty"`
//
// // Field appears in map as key "Field" (the default), but
// // the field is skipped if empty.
// Field string `structs:",omitempty"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected.
func (s *Struct) Map() map[string]interface{} {
out := make(map[string]interface{})
fields := s.structFields()
for _, field := range fields {
name := field.Name
val := s.value.FieldByName(name)
var finalVal interface{}
tagName, tagOpts := parseTag(field.Tag.Get(s.TagName))
if tagName != "" {
name = tagName
}
// if the value is a zero value and the field is marked as omitempty do
// not include
if tagOpts.Has("omitempty") {
zero := reflect.Zero(val.Type()).Interface()
current := val.Interface()
if reflect.DeepEqual(current, zero) {
continue
}
}
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
// look out for embedded structs, and convert them to a
// map[string]interface{} too
finalVal = Map(val.Interface())
} else {
finalVal = val.Interface()
}
out[name] = finalVal
}
return out
}
// Values converts the given s struct's field values to a []interface{}. A
// struct tag with the content of "-" ignores the that particular field.
// Example:
//
// // Field is ignored by this package.
// Field int `structs:"-"`
//
// A value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Fields is not processed further by this package.
// Field time.Time `structs:",omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// A tag value with the option of "omitempty" ignores that particular field and
// is not added to the values if the field value is empty. Example:
//
// // Field is skipped if empty
// Field string `structs:",omitempty"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected.
func (s *Struct) Values() []interface{} {
fields := s.structFields()
var t []interface{}
for _, field := range fields {
val := s.value.FieldByName(field.Name)
_, tagOpts := parseTag(field.Tag.Get(s.TagName))
// if the value is a zero value and the field is marked as omitempty do
// not include
if tagOpts.Has("omitempty") {
zero := reflect.Zero(val.Type()).Interface()
current := val.Interface()
if reflect.DeepEqual(current, zero) {
continue
}
}
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
// look out for embedded structs, and convert them to a
// []interface{} to be added to the final values slice
for _, embeddedVal := range Values(val.Interface()) {
t = append(t, embeddedVal)
}
} else {
t = append(t, val.Interface())
}
}
return t
}
// Fields returns a slice of Fields. A struct tag with the content of "-"
// ignores the checking of that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// It panics if s's kind is not struct.
func (s *Struct) Fields() []*Field {
return getFields(s.value, s.TagName)
}
func getFields(v reflect.Value, tagName string) []*Field {
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
t := v.Type()
var fields []*Field
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
if tag := field.Tag.Get(tagName); tag == "-" {
continue
}
f := &Field{
field: field,
value: v.FieldByName(field.Name),
}
fields = append(fields, f)
}
return fields
}
// Field returns a new Field struct that provides several high level functions
// around a single struct field entity. It panics if the field is not found.
func (s *Struct) Field(name string) *Field {
f, ok := s.FieldOk(name)
if !ok {
panic("field not found")
}
return f
}
// Field returns a new Field struct that provides several high level functions
// around a single struct field entity. The boolean returns true if the field
// was found.
func (s *Struct) FieldOk(name string) (*Field, bool) {
t := s.value.Type()
field, ok := t.FieldByName(name)
if !ok {
return nil, false
}
return &Field{
field: field,
value: s.value.FieldByName(name),
defaultTag: s.TagName,
}, true
}
// IsZero returns true if all fields in a struct is a zero value (not
// initialized) A struct tag with the content of "-" ignores the checking of
// that particular field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// A value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Field is not processed further by this package.
// Field time.Time `structs:"myName,omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected. It panics if s's kind is not struct.
func (s *Struct) IsZero() bool {
fields := s.structFields()
for _, field := range fields {
val := s.value.FieldByName(field.Name)
_, tagOpts := parseTag(field.Tag.Get(s.TagName))
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
ok := IsZero(val.Interface())
if !ok {
return false
}
continue
}
// zero value of the given field, such as "" for string, 0 for int
zero := reflect.Zero(val.Type()).Interface()
// current value of the given field
current := val.Interface()
if !reflect.DeepEqual(current, zero) {
return false
}
}
return true
}
// HasZero returns true if a field in a struct is not initialized (zero value).
// A struct tag with the content of "-" ignores the checking of that particular
// field. Example:
//
// // Field is ignored by this package.
// Field bool `structs:"-"`
//
// A value with the option of "omitnested" stops iterating further if the type
// is a struct. Example:
//
// // Field is not processed further by this package.
// Field time.Time `structs:"myName,omitnested"`
// Field *http.Request `structs:",omitnested"`
//
// Note that only exported fields of a struct can be accessed, non exported
// fields will be neglected. It panics if s's kind is not struct.
func (s *Struct) HasZero() bool {
fields := s.structFields()
for _, field := range fields {
val := s.value.FieldByName(field.Name)
_, tagOpts := parseTag(field.Tag.Get(s.TagName))
if IsStruct(val.Interface()) && !tagOpts.Has("omitnested") {
ok := HasZero(val.Interface())
if ok {
return true
}
continue
}
// zero value of the given field, such as "" for string, 0 for int
zero := reflect.Zero(val.Type()).Interface()
// current value of the given field
current := val.Interface()
if reflect.DeepEqual(current, zero) {
return true
}
}
return false
}
// Name returns the structs's type name within its package. For more info refer
// to Name() function.
func (s *Struct) Name() string {
return s.value.Type().Name()
}
// structFields returns the exported struct fields for a given s struct. This
// is a convenient helper method to avoid duplicate code in some of the
// functions.
func (s *Struct) structFields() []reflect.StructField {
t := s.value.Type()
var f []reflect.StructField
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
// we can't access the value of unexported fields
if field.PkgPath != "" {
continue
}
// don't check if it's omitted
if tag := field.Tag.Get(s.TagName); tag == "-" {
continue
}
f = append(f, field)
}
return f
}
func strctVal(s interface{}) reflect.Value {
v := reflect.ValueOf(s)
// if pointer get the underlying element≤
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
panic("not struct")
}
return v
}
// Map converts the given struct to a map[string]interface{}. For more info
// refer to Struct types Map() method. It panics if s's kind is not struct.
func Map(s interface{}) map[string]interface{} {
return New(s).Map()
}
// Values converts the given struct to a []interface{}. For more info refer to
// Struct types Values() method. It panics if s's kind is not struct.
func Values(s interface{}) []interface{} {
return New(s).Values()
}
// Fields returns a slice of *Field. For more info refer to Struct types
// Fields() method. It panics if s's kind is not struct.
func Fields(s interface{}) []*Field {
return New(s).Fields()
}
// IsZero returns true if all fields is equal to a zero value. For more info
// refer to Struct types IsZero() method. It panics if s's kind is not struct.
func IsZero(s interface{}) bool {
return New(s).IsZero()
}
// HasZero returns true if any field is equal to a zero value. For more info
// refer to Struct types HasZero() method. It panics if s's kind is not struct.
func HasZero(s interface{}) bool {
return New(s).HasZero()
}
// IsStruct returns true if the given variable is a struct or a pointer to
// struct.
func IsStruct(s interface{}) bool {
v := reflect.ValueOf(s)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
// uninitialized zero value of a struct
if v.Kind() == reflect.Invalid {
return false
}
return v.Kind() == reflect.Struct
}
// Name returns the structs's type name within its package. It returns an
// empty string for unnamed types. It panics if s's kind is not struct.
func Name(s interface{}) string {
return New(s).Name()
}

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package structs
import (
"fmt"
"time"
)
func ExampleNew() {
type Server struct {
Name string
ID int32
Enabled bool
}
server := &Server{
Name: "Arslan",
ID: 123456,
Enabled: true,
}
s := New(server)
fmt.Printf("Name : %v\n", s.Name())
fmt.Printf("Values : %v\n", s.Values())
fmt.Printf("Value of ID : %v\n", s.Field("ID").Value())
// Output:
// Name : Server
// Values : [Arslan 123456 true]
// Value of ID : 123456
}
func ExampleMap() {
type Server struct {
Name string
ID int32
Enabled bool
}
s := &Server{
Name: "Arslan",
ID: 123456,
Enabled: true,
}
m := Map(s)
fmt.Printf("%#v\n", m["Name"])
fmt.Printf("%#v\n", m["ID"])
fmt.Printf("%#v\n", m["Enabled"])
// Output:
// "Arslan"
// 123456
// true
}
func ExampleMap_tags() {
// Custom tags can change the map keys instead of using the fields name
type Server struct {
Name string `structs:"server_name"`
ID int32 `structs:"server_id"`
Enabled bool `structs:"enabled"`
}
s := &Server{
Name: "Zeynep",
ID: 789012,
}
m := Map(s)
// access them by the custom tags defined above
fmt.Printf("%#v\n", m["server_name"])
fmt.Printf("%#v\n", m["server_id"])
fmt.Printf("%#v\n", m["enabled"])
// Output:
// "Zeynep"
// 789012
// false
}
func ExampleMap_nested() {
// By default field with struct types are processed too. We can stop
// processing them via "omitnested" tag option.
type Server struct {
Name string `structs:"server_name"`
ID int32 `structs:"server_id"`
Time time.Time `structs:"time,omitnested"` // do not convert to map[string]interface{}
}
const shortForm = "2006-Jan-02"
t, _ := time.Parse("2006-Jan-02", "2013-Feb-03")
s := &Server{
Name: "Zeynep",
ID: 789012,
Time: t,
}
m := Map(s)
// access them by the custom tags defined above
fmt.Printf("%v\n", m["server_name"])
fmt.Printf("%v\n", m["server_id"])
fmt.Printf("%v\n", m["time"].(time.Time))
// Output:
// Zeynep
// 789012
// 2013-02-03 00:00:00 +0000 UTC
}
func ExampleMap_omitEmpty() {
// By default field with struct types of zero values are processed too. We
// can stop processing them via "omitempty" tag option.
type Server struct {
Name string `structs:",omitempty"`
ID int32 `structs:"server_id,omitempty"`
Location string
}
// Only add location
s := &Server{
Location: "Tokyo",
}
m := Map(s)
// map contains only the Location field
fmt.Printf("%v\n", m)
// Output:
// map[Location:Tokyo]
}
func ExampleValues() {
type Server struct {
Name string
ID int32
Enabled bool
}
s := &Server{
Name: "Fatih",
ID: 135790,
Enabled: false,
}
m := Values(s)
fmt.Printf("Values: %+v\n", m)
// Output:
// Values: [Fatih 135790 false]
}
func ExampleValues_omitEmpty() {
// By default field with struct types of zero values are processed too. We
// can stop processing them via "omitempty" tag option.
type Server struct {
Name string `structs:",omitempty"`
ID int32 `structs:"server_id,omitempty"`
Location string
}
// Only add location
s := &Server{
Location: "Ankara",
}
m := Values(s)
// values contains only the Location field
fmt.Printf("Values: %+v\n", m)
// Output:
// Values: [Ankara]
}
func ExampleValues_tags() {
type Location struct {
City string
Country string
}
type Server struct {
Name string
ID int32
Enabled bool
Location Location `structs:"-"` // values from location are not included anymore
}
s := &Server{
Name: "Fatih",
ID: 135790,
Enabled: false,
Location: Location{City: "Ankara", Country: "Turkey"},
}
// Let get all values from the struct s. Note that we don't include values
// from the Location field
m := Values(s)
fmt.Printf("Values: %+v\n", m)
// Output:
// Values: [Fatih 135790 false]
}
func ExampleFields() {
type Access struct {
Name string
LastAccessed time.Time
Number int
}
s := &Access{
Name: "Fatih",
LastAccessed: time.Now(),
Number: 1234567,
}
fields := Fields(s)
for i, field := range fields {
fmt.Printf("[%d] %+v\n", i, field.Name())
}
// Output:
// [0] Name
// [1] LastAccessed
// [2] Number
}
func ExampleFields_nested() {
type Person struct {
Name string
Number int
}
type Access struct {
Person Person
HasPermission bool
LastAccessed time.Time
}
s := &Access{
Person: Person{Name: "fatih", Number: 1234567},
LastAccessed: time.Now(),
HasPermission: true,
}
// Let's get all fields from the struct s.
fields := Fields(s)
for _, field := range fields {
if field.Name() == "Person" {
fmt.Printf("Access.Person.Name: %+v\n", field.Field("Name").Value())
}
}
// Output:
// Access.Person.Name: fatih
}
func ExampleField() {
type Person struct {
Name string
Number int
}
type Access struct {
Person Person
HasPermission bool
LastAccessed time.Time
}
access := &Access{
Person: Person{Name: "fatih", Number: 1234567},
LastAccessed: time.Now(),
HasPermission: true,
}
// Create a new Struct type
s := New(access)
// Get the Field type for "Person" field
p := s.Field("Person")
// Get the underlying "Name field" and print the value of it
name := p.Field("Name")
fmt.Printf("Value of Person.Access.Name: %+v\n", name.Value())
// Output:
// Value of Person.Access.Name: fatih
}
func ExampleIsZero() {
type Server struct {
Name string
ID int32
Enabled bool
}
// Nothing is initalized
a := &Server{}
isZeroA := IsZero(a)
// Name and Enabled is initialized, but not ID
b := &Server{
Name: "Golang",
Enabled: true,
}
isZeroB := IsZero(b)
fmt.Printf("%#v\n", isZeroA)
fmt.Printf("%#v\n", isZeroB)
// Output:
// true
// false
}
func ExampleHasZero() {
// Let's define an Access struct. Note that the "Enabled" field is not
// going to be checked because we added the "structs" tag to the field.
type Access struct {
Name string
LastAccessed time.Time
Number int
Enabled bool `structs:"-"`
}
// Name and Number is not initialized.
a := &Access{
LastAccessed: time.Now(),
}
hasZeroA := HasZero(a)
// Name and Number is initialized.
b := &Access{
Name: "Fatih",
LastAccessed: time.Now(),
Number: 12345,
}
hasZeroB := HasZero(b)
fmt.Printf("%#v\n", hasZeroA)
fmt.Printf("%#v\n", hasZeroB)
// Output:
// true
// false
}

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package structs
import (
"fmt"
"reflect"
"testing"
"time"
)
func TestMapNonStruct(t *testing.T) {
foo := []string{"foo"}
defer func() {
err := recover()
if err == nil {
t.Error("Passing a non struct into Map should panic")
}
}()
// this should panic. We are going to recover and and test it
_ = Map(foo)
}
func TestStructIndexes(t *testing.T) {
type C struct {
something int
Props map[string]interface{}
}
defer func() {
err := recover()
if err != nil {
fmt.Printf("err %+v\n", err)
t.Error("Using mixed indexes should not panic")
}
}()
// They should not panic
_ = Map(&C{})
_ = Fields(&C{})
_ = Values(&C{})
_ = IsZero(&C{})
_ = HasZero(&C{})
}
func TestMap(t *testing.T) {
var T = struct {
A string
B int
C bool
}{
A: "a-value",
B: 2,
C: true,
}
a := Map(T)
if typ := reflect.TypeOf(a).Kind(); typ != reflect.Map {
t.Errorf("Map should return a map type, got: %v", typ)
}
// we have three fields
if len(a) != 3 {
t.Errorf("Map should return a map of len 3, got: %d", len(a))
}
inMap := func(val interface{}) bool {
for _, v := range a {
if reflect.DeepEqual(v, val) {
return true
}
}
return false
}
for _, val := range []interface{}{"a-value", 2, true} {
if !inMap(val) {
t.Errorf("Map should have the value %v", val)
}
}
}
func TestMap_Tag(t *testing.T) {
var T = struct {
A string `structs:"x"`
B int `structs:"y"`
C bool `structs:"z"`
}{
A: "a-value",
B: 2,
C: true,
}
a := Map(T)
inMap := func(key interface{}) bool {
for k := range a {
if reflect.DeepEqual(k, key) {
return true
}
}
return false
}
for _, key := range []string{"x", "y", "z"} {
if !inMap(key) {
t.Errorf("Map should have the key %v", key)
}
}
}
func TestMap_CustomTag(t *testing.T) {
var T = struct {
A string `dd:"x"`
B int `dd:"y"`
C bool `dd:"z"`
}{
A: "a-value",
B: 2,
C: true,
}
s := New(T)
s.TagName = "dd"
a := s.Map()
inMap := func(key interface{}) bool {
for k := range a {
if reflect.DeepEqual(k, key) {
return true
}
}
return false
}
for _, key := range []string{"x", "y", "z"} {
if !inMap(key) {
t.Errorf("Map should have the key %v", key)
}
}
}
func TestMap_MultipleCustomTag(t *testing.T) {
var A = struct {
X string `aa:"ax"`
}{"a_value"}
aStruct := New(A)
aStruct.TagName = "aa"
var B = struct {
X string `bb:"bx"`
}{"b_value"}
bStruct := New(B)
bStruct.TagName = "bb"
a, b := aStruct.Map(), bStruct.Map()
if !reflect.DeepEqual(a, map[string]interface{}{"ax": "a_value"}) {
t.Error("Map should have field ax with value a_value")
}
if !reflect.DeepEqual(b, map[string]interface{}{"bx": "b_value"}) {
t.Error("Map should have field bx with value b_value")
}
}
func TestMap_OmitEmpty(t *testing.T) {
type A struct {
Name string
Value string `structs:",omitempty"`
Time time.Time `structs:",omitempty"`
}
a := A{}
m := Map(a)
_, ok := m["Value"].(map[string]interface{})
if ok {
t.Error("Map should not contain the Value field that is tagged as omitempty")
}
_, ok = m["Time"].(map[string]interface{})
if ok {
t.Error("Map should not contain the Time field that is tagged as omitempty")
}
}
func TestMap_OmitNested(t *testing.T) {
type A struct {
Name string
Value string
Time time.Time `structs:",omitnested"`
}
a := A{Time: time.Now()}
type B struct {
Desc string
A A
}
b := &B{A: a}
m := Map(b)
in, ok := m["A"].(map[string]interface{})
if !ok {
t.Error("Map nested structs is not available in the map")
}
// should not happen
if _, ok := in["Time"].(map[string]interface{}); ok {
t.Error("Map nested struct should omit recursiving parsing of Time")
}
if _, ok := in["Time"].(time.Time); !ok {
t.Error("Map nested struct should stop parsing of Time at is current value")
}
}
func TestMap_Nested(t *testing.T) {
type A struct {
Name string
}
a := &A{Name: "example"}
type B struct {
A *A
}
b := &B{A: a}
m := Map(b)
if typ := reflect.TypeOf(m).Kind(); typ != reflect.Map {
t.Errorf("Map should return a map type, got: %v", typ)
}
in, ok := m["A"].(map[string]interface{})
if !ok {
t.Error("Map nested structs is not available in the map")
}
if name := in["Name"].(string); name != "example" {
t.Errorf("Map nested struct's name field should give example, got: %s", name)
}
}
func TestMap_Anonymous(t *testing.T) {
type A struct {
Name string
}
a := &A{Name: "example"}
type B struct {
*A
}
b := &B{}
b.A = a
m := Map(b)
if typ := reflect.TypeOf(m).Kind(); typ != reflect.Map {
t.Errorf("Map should return a map type, got: %v", typ)
}
in, ok := m["A"].(map[string]interface{})
if !ok {
t.Error("Embedded structs is not available in the map")
}
if name := in["Name"].(string); name != "example" {
t.Errorf("Embedded A struct's Name field should give example, got: %s", name)
}
}
func TestStruct(t *testing.T) {
var T = struct{}{}
if !IsStruct(T) {
t.Errorf("T should be a struct, got: %T", T)
}
if !IsStruct(&T) {
t.Errorf("T should be a struct, got: %T", T)
}
}
func TestValues(t *testing.T) {
var T = struct {
A string
B int
C bool
}{
A: "a-value",
B: 2,
C: true,
}
s := Values(T)
if typ := reflect.TypeOf(s).Kind(); typ != reflect.Slice {
t.Errorf("Values should return a slice type, got: %v", typ)
}
inSlice := func(val interface{}) bool {
for _, v := range s {
if reflect.DeepEqual(v, val) {
return true
}
}
return false
}
for _, val := range []interface{}{"a-value", 2, true} {
if !inSlice(val) {
t.Errorf("Values should have the value %v", val)
}
}
}
func TestValues_OmitEmpty(t *testing.T) {
type A struct {
Name string
Value int `structs:",omitempty"`
}
a := A{Name: "example"}
s := Values(a)
if len(s) != 1 {
t.Errorf("Values of omitted empty fields should be not counted")
}
if s[0].(string) != "example" {
t.Errorf("Values of omitted empty fields should left the value example")
}
}
func TestValues_OmitNested(t *testing.T) {
type A struct {
Name string
Value int
}
a := A{
Name: "example",
Value: 123,
}
type B struct {
A A `structs:",omitnested"`
C int
}
b := &B{A: a, C: 123}
s := Values(b)
if len(s) != 2 {
t.Errorf("Values of omitted nested struct should be not counted")
}
inSlice := func(val interface{}) bool {
for _, v := range s {
if reflect.DeepEqual(v, val) {
return true
}
}
return false
}
for _, val := range []interface{}{123, a} {
if !inSlice(val) {
t.Errorf("Values should have the value %v", val)
}
}
}
func TestValues_Nested(t *testing.T) {
type A struct {
Name string
}
a := A{Name: "example"}
type B struct {
A A
C int
}
b := &B{A: a, C: 123}
s := Values(b)
inSlice := func(val interface{}) bool {
for _, v := range s {
if reflect.DeepEqual(v, val) {
return true
}
}
return false
}
for _, val := range []interface{}{"example", 123} {
if !inSlice(val) {
t.Errorf("Values should have the value %v", val)
}
}
}
func TestValues_Anonymous(t *testing.T) {
type A struct {
Name string
}
a := A{Name: "example"}
type B struct {
A
C int
}
b := &B{C: 123}
b.A = a
s := Values(b)
inSlice := func(val interface{}) bool {
for _, v := range s {
if reflect.DeepEqual(v, val) {
return true
}
}
return false
}
for _, val := range []interface{}{"example", 123} {
if !inSlice(val) {
t.Errorf("Values should have the value %v", val)
}
}
}
func TestFields(t *testing.T) {
var T = struct {
A string
B int
C bool
}{
A: "a-value",
B: 2,
C: true,
}
s := Fields(T)
if len(s) != 3 {
t.Errorf("Fields should return a slice of len 3, got: %d", len(s))
}
inSlice := func(val string) bool {
for _, v := range s {
if reflect.DeepEqual(v.Name(), val) {
return true
}
}
return false
}
for _, val := range []string{"A", "B", "C"} {
if !inSlice(val) {
t.Errorf("Fields should have the value %v", val)
}
}
}
func TestFields_OmitNested(t *testing.T) {
type A struct {
Name string
Enabled bool
}
a := A{Name: "example"}
type B struct {
A A
C int
Value string `structs:"-"`
Number int
}
b := &B{A: a, C: 123}
s := Fields(b)
if len(s) != 3 {
t.Errorf("Fields should omit nested struct. Expecting 2 got: %d", len(s))
}
inSlice := func(val interface{}) bool {
for _, v := range s {
if reflect.DeepEqual(v.Name(), val) {
return true
}
}
return false
}
for _, val := range []interface{}{"A", "C"} {
if !inSlice(val) {
t.Errorf("Fields should have the value %v", val)
}
}
}
func TestFields_Anonymous(t *testing.T) {
type A struct {
Name string
}
a := A{Name: "example"}
type B struct {
A
C int
}
b := &B{C: 123}
b.A = a
s := Fields(b)
inSlice := func(val interface{}) bool {
for _, v := range s {
if reflect.DeepEqual(v.Name(), val) {
return true
}
}
return false
}
for _, val := range []interface{}{"A", "C"} {
if !inSlice(val) {
t.Errorf("Fields should have the value %v", val)
}
}
}
func TestIsZero(t *testing.T) {
var T = struct {
A string
B int
C bool `structs:"-"`
D []string
}{}
ok := IsZero(T)
if !ok {
t.Error("IsZero should return true because none of the fields are initialized.")
}
var X = struct {
A string
F *bool
}{
A: "a-value",
}
ok = IsZero(X)
if ok {
t.Error("IsZero should return false because A is initialized")
}
var Y = struct {
A string
B int
}{
A: "a-value",
B: 123,
}
ok = IsZero(Y)
if ok {
t.Error("IsZero should return false because A and B is initialized")
}
}
func TestIsZero_OmitNested(t *testing.T) {
type A struct {
Name string
D string
}
a := A{Name: "example"}
type B struct {
A A `structs:",omitnested"`
C int
}
b := &B{A: a, C: 123}
ok := IsZero(b)
if ok {
t.Error("IsZero should return false because A, B and C are initialized")
}
aZero := A{}
bZero := &B{A: aZero}
ok = IsZero(bZero)
if !ok {
t.Error("IsZero should return true because neither A nor B is initialized")
}
}
func TestIsZero_Nested(t *testing.T) {
type A struct {
Name string
D string
}
a := A{Name: "example"}
type B struct {
A A
C int
}
b := &B{A: a, C: 123}
ok := IsZero(b)
if ok {
t.Error("IsZero should return false because A, B and C are initialized")
}
aZero := A{}
bZero := &B{A: aZero}
ok = IsZero(bZero)
if !ok {
t.Error("IsZero should return true because neither A nor B is initialized")
}
}
func TestIsZero_Anonymous(t *testing.T) {
type A struct {
Name string
D string
}
a := A{Name: "example"}
type B struct {
A
C int
}
b := &B{C: 123}
b.A = a
ok := IsZero(b)
if ok {
t.Error("IsZero should return false because A, B and C are initialized")
}
aZero := A{}
bZero := &B{}
bZero.A = aZero
ok = IsZero(bZero)
if !ok {
t.Error("IsZero should return true because neither A nor B is initialized")
}
}
func TestHasZero(t *testing.T) {
var T = struct {
A string
B int
C bool `structs:"-"`
D []string
}{
A: "a-value",
B: 2,
}
ok := HasZero(T)
if !ok {
t.Error("HasZero should return true because A and B are initialized.")
}
var X = struct {
A string
F *bool
}{
A: "a-value",
}
ok = HasZero(X)
if !ok {
t.Error("HasZero should return true because A is initialized")
}
var Y = struct {
A string
B int
}{
A: "a-value",
B: 123,
}
ok = HasZero(Y)
if ok {
t.Error("HasZero should return false because A and B is initialized")
}
}
func TestHasZero_OmitNested(t *testing.T) {
type A struct {
Name string
D string
}
a := A{Name: "example"}
type B struct {
A A `structs:",omitnested"`
C int
}
b := &B{A: a, C: 123}
// Because the Field A inside B is omitted HasZero should return false
// because it will stop iterating deeper andnot going to lookup for D
ok := HasZero(b)
if ok {
t.Error("HasZero should return false because A and C are initialized")
}
}
func TestHasZero_Nested(t *testing.T) {
type A struct {
Name string
D string
}
a := A{Name: "example"}
type B struct {
A A
C int
}
b := &B{A: a, C: 123}
ok := HasZero(b)
if !ok {
t.Error("HasZero should return true because D is not initialized")
}
}
func TestHasZero_Anonymous(t *testing.T) {
type A struct {
Name string
D string
}
a := A{Name: "example"}
type B struct {
A
C int
}
b := &B{C: 123}
b.A = a
ok := HasZero(b)
if !ok {
t.Error("HasZero should return false because D is not initialized")
}
}
func TestName(t *testing.T) {
type Foo struct {
A string
B bool
}
f := &Foo{}
n := Name(f)
if n != "Foo" {
t.Errorf("Name should return Foo, got: %s", n)
}
unnamed := struct{ Name string }{Name: "Cihangir"}
m := Name(unnamed)
if m != "" {
t.Errorf("Name should return empty string for unnamed struct, got: %s", n)
}
defer func() {
err := recover()
if err == nil {
t.Error("Name should panic if a non struct is passed")
}
}()
Name([]string{})
}
func TestNestedNilPointer(t *testing.T) {
type Collar struct {
Engraving string
}
type Dog struct {
Name string
Collar *Collar
}
type Person struct {
Name string
Dog *Dog
}
person := &Person{
Name: "John",
}
personWithDog := &Person{
Name: "Ron",
Dog: &Dog{
Name: "Rover",
},
}
personWithDogWithCollar := &Person{
Name: "Kon",
Dog: &Dog{
Name: "Ruffles",
Collar: &Collar{
Engraving: "If lost, call Kon",
},
},
}
defer func() {
err := recover()
if err != nil {
fmt.Printf("err %+v\n", err)
t.Error("Internal nil pointer should not panic")
}
}()
_ = Map(person) // Panics
_ = Map(personWithDog) // Panics
_ = Map(personWithDogWithCollar) // Doesn't panic
}

32
Godeps/_workspace/src/github.com/fatih/structs/tags.go generated vendored Normal file
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@ -0,0 +1,32 @@
package structs
import "strings"
// tagOptions contains a slice of tag options
type tagOptions []string
// Has returns true if the given optiton is available in tagOptions
func (t tagOptions) Has(opt string) bool {
for _, tagOpt := range t {
if tagOpt == opt {
return true
}
}
return false
}
// parseTag splits a struct field's tag into its name and a list of options
// which comes after a name. A tag is in the form of: "name,option1,option2".
// The name can be neglectected.
func parseTag(tag string) (string, tagOptions) {
// tag is one of followings:
// ""
// "name"
// "name,opt"
// "name,opt,opt2"
// ",opt"
res := strings.Split(tag, ",")
return res[0], res[1:]
}

46
Godeps/_workspace/src/github.com/fatih/structs/tags_test.go generated vendored Normal file
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@ -0,0 +1,46 @@
package structs
import "testing"
func TestParseTag_Name(t *testing.T) {
tags := []struct {
tag string
has bool
}{
{"", false},
{"name", true},
{"name,opt", true},
{"name , opt, opt2", false}, // has a single whitespace
{", opt, opt2", false},
}
for _, tag := range tags {
name, _ := parseTag(tag.tag)
if (name != "name") && tag.has {
t.Errorf("Parse tag should return name: %#v", tag)
}
}
}
func TestParseTag_Opts(t *testing.T) {
tags := []struct {
opts string
has bool
}{
{"name", false},
{"name,opt", true},
{"name , opt, opt2", false}, // has a single whitespace
{",opt, opt2", true},
{", opt3, opt4", false},
}
// search for "opt"
for _, tag := range tags {
_, opts := parseTag(tag.opts)
if opts.Has("opt") != tag.has {
t.Errorf("Tag opts should have opt: %#v", tag)
}
}
}

229
pkg/quick/quick.go Normal file
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@ -0,0 +1,229 @@
/*
* Quick - Quick key value store for config files and persistent state files
*
* Minio Client (C) 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package quick
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"os"
"reflect"
"runtime"
"strings"
"sync"
"github.com/fatih/structs"
"github.com/minio/minio/pkg/iodine"
)
// Config - generic config interface functions
type Config interface {
String() string
Version() string
Save(string) error
Load(string) error
Data() interface{}
Diff(Config) ([]structs.Field, error)
DeepDiff(Config) ([]structs.Field, error)
}
// config - implements quick.Config interface
type config struct {
data *interface{}
lock *sync.RWMutex
}
// CheckData - checks the validity of config data. Data sould be of type struct and contain a string type field called "Version"
func CheckData(data interface{}) error {
if !structs.IsStruct(data) {
return iodine.New(errors.New("Invalid argument type. Expecing \"struct\" type."), nil)
}
st := structs.New(data)
f, ok := st.FieldOk("Version")
if !ok {
return iodine.New(fmt.Errorf("Invalid type of struct argument. No [%s.Version] field found.", st.Name()), nil)
}
if f.Kind() != reflect.String {
return iodine.New(fmt.Errorf("Invalid type of struct argument. Expecting \"string\" type [%s.Version] field.", st.Name()), nil)
}
return nil
}
// New - instantiate a new config
func New(data interface{}) (Config, error) {
err := CheckData(data)
if err != nil {
return nil, err
}
d := new(config)
d.data = &data
d.lock = new(sync.RWMutex)
return d, nil
}
// Version returns the current config file format version
func (d config) Version() string {
st := structs.New(*d.data)
f, ok := st.FieldOk("Version")
if !ok {
return ""
}
val := f.Value()
ver, ok := val.(string)
if ok {
return ver
}
return ""
}
// String converts JSON config to printable string
func (d config) String() string {
configBytes, _ := json.MarshalIndent(*d.data, "", "\t")
return string(configBytes)
}
// Save writes config data in JSON format to a file.
func (d config) Save(filename string) (err error) {
d.lock.Lock()
defer d.lock.Unlock()
jsonData, err := json.MarshalIndent(d.data, "", "\t")
if err != nil {
return iodine.New(err, nil)
}
file, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return iodine.New(err, nil)
}
defer file.Close()
if runtime.GOOS == "windows" {
jsonData = []byte(strings.Replace(string(jsonData), "\n", "\r\n", -1))
}
_, err = file.Write(jsonData)
if err != nil {
return iodine.New(err, nil)
}
return nil
}
// Load - loads JSON config from file and merge with currently set values
func (d *config) Load(filename string) (err error) {
(*d).lock.Lock()
defer (*d).lock.Unlock()
_, err = os.Stat(filename)
if err != nil {
return iodine.New(err, nil)
}
fileData, err := ioutil.ReadFile(filename)
if err != nil {
return iodine.New(err, nil)
}
if runtime.GOOS == "windows" {
fileData = []byte(strings.Replace(string(fileData), "\r\n", "\n", -1))
}
err = json.Unmarshal(fileData, (*d).data)
if err != nil {
return iodine.New(err, nil)
}
err = CheckData(*(*d).data)
if err != nil {
return iodine.New(err, nil)
}
st := structs.New(*(*d).data)
f, ok := st.FieldOk("Version")
if !ok {
return iodine.New(fmt.Errorf("Argument struct [%s] does not contain field \"Version\".", st.Name()), nil)
}
if (*d).Version() != f.Value() {
return iodine.New(errors.New("Version mismatch"), nil)
}
return nil
}
// Data - grab internal data map for reading
func (d config) Data() interface{} {
return *d.data
}
//Diff - list fields that are in A but not in B
func (d config) Diff(c Config) (fields []structs.Field, err error) {
err = CheckData(c.Data())
if err != nil {
return []structs.Field{}, iodine.New(err, nil)
}
currFields := structs.Fields(d.Data())
newFields := structs.Fields(c.Data())
found := false
for _, currField := range currFields {
found = false
for _, newField := range newFields {
if reflect.DeepEqual(currField.Name(), newField.Name()) {
found = true
}
}
if !found {
fields = append(fields, *currField)
}
}
return fields, nil
}
//DeepDiff - list fields in A that are missing or not equal to fields in B
func (d config) DeepDiff(c Config) (fields []structs.Field, err error) {
err = CheckData(c.Data())
if err != nil {
return []structs.Field{}, iodine.New(err, nil)
}
currFields := structs.Fields(d.Data())
newFields := structs.Fields(c.Data())
found := false
for _, currField := range currFields {
found = false
for _, newField := range newFields {
if reflect.DeepEqual(currField.Value(), newField.Value()) {
found = true
}
}
if !found {
fields = append(fields, *currField)
}
}
return fields, nil
}

145
pkg/quick/quick_test.go Normal file
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@ -0,0 +1,145 @@
/*
* Quick - Quick key value store for config files and persistent state files
*
* Minio Client (C) 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package quick
import (
"os"
"testing"
. "github.com/minio/check"
)
func Test(t *testing.T) { TestingT(t) }
type MySuite struct{}
var _ = Suite(&MySuite{})
func (s *MySuite) TestCheckData(c *C) {
err := CheckData(nil)
c.Assert(err, Not(IsNil))
type myStructBad struct {
User string
Password string
Folders []string
}
saveMeBad := myStructBad{"guest", "nopassword", []string{"Work", "Documents", "Music"}}
err = CheckData(&saveMeBad)
c.Assert(err, Not(IsNil))
type myStructGood struct {
Version string
User string
Password string
Folders []string
}
saveMeGood := myStructGood{"1", "guest", "nopassword", []string{"Work", "Documents", "Music"}}
err = CheckData(&saveMeGood)
c.Assert(err, IsNil)
}
func (s *MySuite) TestSaveLoad(c *C) {
defer os.RemoveAll("test.json")
type myStruct struct {
Version string
User string
Password string
Folders []string
}
saveMe := myStruct{"1", "guest", "nopassword", []string{"Work", "Documents", "Music"}}
config, err := New(&saveMe)
c.Assert(err, IsNil)
c.Assert(config, Not(IsNil))
config.Save("test.json")
loadMe := myStruct{Version: "1"}
newConfig, err := New(&loadMe)
c.Assert(err, IsNil)
c.Assert(newConfig, Not(IsNil))
newConfig.Load("test.json")
c.Assert(config.Data(), DeepEquals, newConfig.Data())
c.Assert(config.Data(), DeepEquals, &loadMe)
mismatch := myStruct{"1.1", "guest", "nopassword", []string{"Work", "Documents", "Music"}}
c.Assert(newConfig.Data(), Not(DeepEquals), &mismatch)
}
func (s *MySuite) TestDiff(c *C) {
type myStruct struct {
Version string
User string
Password string
Folders []string
}
saveMe := myStruct{"1", "guest", "nopassword", []string{"Work", "Documents", "Music"}}
config, err := New(&saveMe)
c.Assert(err, IsNil)
c.Assert(config, Not(IsNil))
type myNewStruct struct {
Version string
// User string
Password string
Folders []string
}
mismatch := myNewStruct{"1", "nopassword", []string{"Work", "documents", "Music"}}
newConfig, err := New(&mismatch)
c.Assert(err, IsNil)
c.Assert(newConfig, Not(IsNil))
fields, ok := config.Diff(newConfig)
c.Assert(ok, IsNil)
c.Assert(len(fields), Equals, 1)
// Uncomment for debugging
// for i, field := range fields {
// fmt.Printf("Diff[%d]: %s=%v\n", i, field.Name(), field.Value())
// }
}
func (s *MySuite) TestDeepDiff(c *C) {
type myStruct struct {
Version string
User string
Password string
Folders []string
}
saveMe := myStruct{"1", "guest", "nopassword", []string{"Work", "Documents", "Music"}}
config, err := New(&saveMe)
c.Assert(err, IsNil)
c.Assert(config, Not(IsNil))
mismatch := myStruct{"1", "Guest", "nopassword", []string{"Work", "documents", "Music"}}
newConfig, err := New(&mismatch)
c.Assert(err, IsNil)
c.Assert(newConfig, Not(IsNil))
fields, err := config.DeepDiff(newConfig)
c.Assert(err, IsNil)
c.Assert(len(fields), Equals, 2)
// Uncomment for debugging
// for i, field := range fields {
// fmt.Printf("DeepDiff[%d]: %s=%v\n", i, field.Name(), field.Value())
// }
}