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New errors API!!

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This commit is contained in:
Manu Mtz-Almeida 2015-05-22 03:25:21 +02:00
parent 5f76ba2022
commit e94247f9ad
4 changed files with 107 additions and 100 deletions
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133
context.go
View File

@ -126,6 +126,11 @@ func (c *Context) AbortWithStatus(code int) {
c.Abort()
}
func (c *Context) AbortWithError(code int, err error) *errorMsg {
c.AbortWithStatus(code)
return c.Error(err)
}
func (c *Context) IsAborted() bool {
return c.index == AbortIndex
}
@ -134,30 +139,16 @@ func (c *Context) IsAborted() bool {
/********* ERROR MANAGEMENT *********/
/************************************/
// Fail is the same as Abort plus an error message.
// Calling `context.Fail(500, err)` is equivalent to:
// ```
// context.Error("Operation aborted", err)
// context.AbortWithStatus(500)
// ```
func (c *Context) Fail(code int, err error) {
c.Error(err, "Operation aborted")
c.AbortWithStatus(code)
}
func (c *Context) ErrorTyped(err error, typ int, meta interface{}) {
c.Errors = append(c.Errors, errorMsg{
Error: err,
Flags: typ,
Meta: meta,
})
}
// Attaches an error to the current context. The error is pushed to a list of errors.
// It's a good idea to call Error for each error that occurred during the resolution of a request.
// A middleware can be used to collect all the errors and push them to a database together, print a log, or append it in the HTTP response.
func (c *Context) Error(err error, meta interface{}) {
c.ErrorTyped(err, ErrorTypeExternal, meta)
func (c *Context) Error(err error) *errorMsg {
newError := &errorMsg{
Error: err,
Flags: ErrorTypePrivate,
}
c.Errors = append(c.Errors, newError)
return newError
}
func (c *Context) LastError() error {
@ -168,6 +159,35 @@ func (c *Context) LastError() error {
return nil
}
/************************************/
/******** METADATA MANAGEMENT********/
/************************************/
// Sets a new pair key/value just for the specified context.
// It also lazy initializes the hashmap.
func (c *Context) Set(key string, value interface{}) {
if c.Keys == nil {
c.Keys = make(map[string]interface{})
}
c.Keys[key] = value
}
// Get returns the value for the given key or an error if the key does not exist.
func (c *Context) Get(key string) (value interface{}, exists bool) {
if c.Keys != nil {
value, exists = c.Keys[key]
}
return
}
// MustGet returns the value for the given key or panics if the value doesn't exist.
func (c *Context) MustGet(key string) interface{} {
if value, exists := c.Get(key); exists {
return value
}
panic("Key \"" + key + "\" does not exist")
}
/************************************/
/************ INPUT DATA ************/
/************************************/
@ -233,40 +253,29 @@ func (c *Context) postFormValue(key string) (string, bool) {
return "", false
}
/************************************/
/******** METADATA MANAGEMENT********/
/************************************/
// Sets a new pair key/value just for the specified context.
// It also lazy initializes the hashmap.
func (c *Context) Set(key string, value interface{}) {
if c.Keys == nil {
c.Keys = make(map[string]interface{})
}
c.Keys[key] = value
// This function checks the Content-Type to select a binding engine automatically,
// Depending the "Content-Type" header different bindings are used:
// "application/json" --> JSON binding
// "application/xml" --> XML binding
// else --> returns an error
// if Parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input. It decodes the json payload into the struct specified as a pointer.Like ParseBody() but this method also writes a 400 error if the json is not valid.
func (c *Context) Bind(obj interface{}) error {
b := binding.Default(c.Request.Method, c.ContentType())
return c.BindWith(obj, b)
}
// Get returns the value for the given key or an error if the key does not exist.
func (c *Context) Get(key string) (value interface{}, exists bool) {
if c.Keys != nil {
value, exists = c.Keys[key]
}
return
func (c *Context) BindJSON(obj interface{}) error {
return c.BindWith(obj, binding.JSON)
}
// MustGet returns the value for the given key or panics if the value doesn't exist.
func (c *Context) MustGet(key string) interface{} {
if value, exists := c.Get(key); exists {
return value
} else {
panic("Key \"" + key + "\" does not exist")
func (c *Context) BindWith(obj interface{}, b binding.Binding) error {
if err := b.Bind(c.Request, obj); err != nil {
c.AbortWithError(400, err).Type(ErrorTypeBind)
return err
}
return nil
}
/************************************/
/********* PARSING REQUEST **********/
/************************************/
func (c *Context) ClientIP() string {
clientIP := c.Request.Header.Get("X-Real-IP")
if len(clientIP) > 0 {
@ -284,25 +293,6 @@ func (c *Context) ContentType() string {
return filterFlags(c.Request.Header.Get("Content-Type"))
}
// This function checks the Content-Type to select a binding engine automatically,
// Depending the "Content-Type" header different bindings are used:
// "application/json" --> JSON binding
// "application/xml" --> XML binding
// else --> returns an error
// if Parses the request's body as JSON if Content-Type == "application/json" using JSON or XML as a JSON input. It decodes the json payload into the struct specified as a pointer.Like ParseBody() but this method also writes a 400 error if the json is not valid.
func (c *Context) Bind(obj interface{}) bool {
b := binding.Default(c.Request.Method, c.ContentType())
return c.BindWith(obj, b)
}
func (c *Context) BindWith(obj interface{}, b binding.Binding) bool {
if err := b.Bind(c.Request, obj); err != nil {
c.Fail(400, err)
return false
}
return true
}
/************************************/
/******** RESPONSE RENDERING ********/
/************************************/
@ -319,8 +309,7 @@ func (c *Context) Render(code int, r render.Render) {
c.Writer.WriteHeader(code)
if err := r.Write(c.Writer); err != nil {
debugPrintError(err)
c.ErrorTyped(err, ErrorTypeInternal, nil)
c.AbortWithStatus(500)
c.AbortWithError(500, err).Type(ErrorTypeRender)
}
}
@ -430,7 +419,7 @@ func (c *Context) Negotiate(code int, config Negotiate) {
c.XML(code, data)
default:
c.Fail(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server"))
c.AbortWithError(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server"))
}
}
@ -458,6 +447,10 @@ func (c *Context) SetAccepted(formats ...string) {
c.Accepted = formats
}
/************************************/
/******** CONTENT NEGOTIATION *******/
/************************************/
func (c *Context) Deadline() (deadline time.Time, ok bool) {
return
}

42
context_test.go
View File

@ -41,7 +41,7 @@ func TestContextReset(t *testing.T) {
c.index = 2
c.Writer = &responseWriter{ResponseWriter: httptest.NewRecorder()}
c.Params = Params{Param{}}
c.Error(errors.New("test"), nil)
c.Error(errors.New("test"))
c.Set("foo", "bar")
c.reset()
@ -352,41 +352,41 @@ func TestContextError(t *testing.T) {
assert.Nil(t, c.LastError())
assert.Empty(t, c.Errors.String())
c.Error(errors.New("first error"), "some data")
c.Error(errors.New("first error")).Meta("some data")
assert.Equal(t, c.LastError().Error(), "first error")
assert.Len(t, c.Errors, 1)
assert.Equal(t, c.Errors.String(), "Error #01: first error\n Meta: some data\n")
c.Error(errors.New("second error"), "some data 2")
c.Error(errors.New("second error")).Meta("some data 2")
assert.Equal(t, c.LastError().Error(), "second error")
assert.Len(t, c.Errors, 2)
assert.Equal(t, c.Errors.String(), "Error #01: first error\n Meta: some data\n"+
"Error #02: second error\n Meta: some data 2\n")
assert.Equal(t, c.Errors[0].Error, errors.New("first error"))
assert.Equal(t, c.Errors[0].Meta, "some data")
assert.Equal(t, c.Errors[0].Flags, ErrorTypeExternal)
assert.Equal(t, c.Errors[0].Metadata, "some data")
assert.Equal(t, c.Errors[0].Flags, ErrorTypePrivate)
assert.Equal(t, c.Errors[1].Error, errors.New("second error"))
assert.Equal(t, c.Errors[1].Meta, "some data 2")
assert.Equal(t, c.Errors[1].Flags, ErrorTypeExternal)
assert.Equal(t, c.Errors[1].Metadata, "some data 2")
assert.Equal(t, c.Errors[1].Flags, ErrorTypePrivate)
}
func TestContextTypedError(t *testing.T) {
c, _, _ := createTestContext()
c.ErrorTyped(errors.New("externo 0"), ErrorTypeExternal, nil)
c.ErrorTyped(errors.New("externo 1"), ErrorTypeExternal, nil)
c.ErrorTyped(errors.New("interno 0"), ErrorTypeInternal, nil)
c.ErrorTyped(errors.New("externo 2"), ErrorTypeExternal, nil)
c.ErrorTyped(errors.New("interno 1"), ErrorTypeInternal, nil)
c.ErrorTyped(errors.New("interno 2"), ErrorTypeInternal, nil)
c.Error(errors.New("externo 0")).Type(ErrorTypePublic)
c.Error(errors.New("externo 1")).Type(ErrorTypePublic)
c.Error(errors.New("interno 0")).Type(ErrorTypePrivate)
c.Error(errors.New("externo 2")).Type(ErrorTypePublic)
c.Error(errors.New("interno 1")).Type(ErrorTypePrivate)
c.Error(errors.New("interno 2")).Type(ErrorTypePrivate)
for _, err := range c.Errors.ByType(ErrorTypeExternal) {
assert.Equal(t, err.Flags, ErrorTypeExternal)
for _, err := range c.Errors.ByType(ErrorTypePublic) {
assert.Equal(t, err.Flags, ErrorTypePublic)
}
for _, err := range c.Errors.ByType(ErrorTypeInternal) {
assert.Equal(t, err.Flags, ErrorTypeInternal)
for _, err := range c.Errors.ByType(ErrorTypePrivate) {
assert.Equal(t, err.Flags, ErrorTypePrivate)
}
assert.Equal(t, c.Errors.Errors(), []string{"externo 0", "externo 1", "interno 0", "externo 2", "interno 1", "interno 2"})
@ -394,7 +394,7 @@ func TestContextTypedError(t *testing.T) {
func TestContextFail(t *testing.T) {
c, w, _ := createTestContext()
c.Fail(401, errors.New("bad input"))
c.AbortWithError(401, errors.New("bad input"))
c.Writer.WriteHeaderNow()
assert.Equal(t, w.Code, 401)
@ -434,7 +434,7 @@ func TestContextAutoBind(t *testing.T) {
Foo string `json:"foo"`
Bar string `json:"bar"`
}
assert.True(t, c.Bind(&obj))
assert.NoError(t, c.Bind(&obj))
assert.Equal(t, obj.Bar, "foo")
assert.Equal(t, obj.Foo, "bar")
assert.Equal(t, w.Body.Len(), 0)
@ -450,7 +450,7 @@ func TestContextBadAutoBind(t *testing.T) {
}
assert.False(t, c.IsAborted())
assert.False(t, c.Bind(&obj))
assert.Error(t, c.Bind(&obj))
c.Writer.WriteHeaderNow()
assert.Empty(t, obj.Bar)
@ -467,7 +467,7 @@ func TestContextBindWith(t *testing.T) {
Foo string `json:"foo"`
Bar string `json:"bar"`
}
assert.True(t, c.BindWith(&obj, binding.JSON))
assert.NoError(t, c.BindWith(&obj, binding.JSON))
assert.Equal(t, obj.Bar, "foo")
assert.Equal(t, obj.Foo, "bar")
assert.Equal(t, w.Body.Len(), 0)

24
errors.go
View File

@ -10,19 +10,33 @@ import (
)
const (
ErrorTypeInternal = 1 << iota
ErrorTypeExternal = 1 << iota
ErrorTypeBind = 1 << 31
ErrorTypeRender = 1 << 30
ErrorTypePrivate = 1 << 0
ErrorTypePublic = 1 << 1
ErrorTypeAny = 0xffffffff
ErrorTypeNu = 2
)
// Used internally to collect errors that occurred during an http request.
type errorMsg struct {
Error error `json:"error"`
Flags int `json:"-"`
Meta interface{} `json:"meta"`
Metadata interface{} `json:"meta"`
}
type errorMsgs []errorMsg
func (msg *errorMsg) Type(flags int) *errorMsg {
msg.Flags = flags
return msg
}
func (msg *errorMsg) Meta(data interface{}) *errorMsg {
msg.Metadata = data
return msg
}
type errorMsgs []*errorMsg
func (a errorMsgs) ByType(typ int) errorMsgs {
if len(a) == 0 {
@ -54,7 +68,7 @@ func (a errorMsgs) String() string {
}
var buffer bytes.Buffer
for i, msg := range a {
fmt.Fprintf(&buffer, "Error #%02d: %s\n Meta: %v\n", (i + 1), msg.Error, msg.Meta)
fmt.Fprintf(&buffer, "Error #%02d: %s\n Meta: %v\n", (i + 1), msg.Error, msg.Metadata)
}
return buffer.String()
}

2
middleware_test.go
View File

@ -169,7 +169,7 @@ func TestMiddlewareFailHandlersChain(t *testing.T) {
router := New()
router.Use(func(context *Context) {
signature += "A"
context.Fail(500, errors.New("foo"))
context.AbortWithError(500, errors.New("foo"))
})
router.Use(func(context *Context) {
signature += "B"