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Splitting source code in different files

This commit is contained in:
Manu Mtz-Almeida 2014-07-16 20:14:03 +02:00
parent 3cf2d1338f
commit dc43372610
3 changed files with 308 additions and 292 deletions
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257
context.go Normal file
View File

@ -0,0 +1,257 @@
package gin
import (
"bytes"
"errors"
"fmt"
"github.com/gin-gonic/gin/binding"
"github.com/gin-gonic/gin/render"
"github.com/julienschmidt/httprouter"
"log"
"net/http"
)
const (
ErrorTypeInternal = 1 << iota
ErrorTypeExternal = 1 << iota
ErrorTypeAll = 0xffffffff
)
// Used internally to collect errors that occurred during an http request.
type errorMsg struct {
Err string `json:"error"`
Type uint32 `json:"-"`
Meta interface{} `json:"meta"`
}
type errorMsgs []errorMsg
func (a errorMsgs) ByType(typ uint32) errorMsgs {
if len(a) == 0 {
return a
}
result := make(errorMsgs, 0, len(a))
for _, msg := range a {
if msg.Type&typ > 0 {
result = append(result, msg)
}
}
return result
}
func (a errorMsgs) String() string {
if len(a) == 0 {
return ""
}
var buffer bytes.Buffer
for i, msg := range a {
text := fmt.Sprintf("Error #%02d: %s \n Meta: %v\n", (i + 1), msg.Err, msg.Meta)
buffer.WriteString(text)
}
return buffer.String()
}
// Context is the most important part of gin. It allows us to pass variables between middleware,
// manage the flow, validate the JSON of a request and render a JSON response for example.
type Context struct {
Request *http.Request
Writer ResponseWriter
Keys map[string]interface{}
Errors errorMsgs
Params httprouter.Params
Engine *Engine
handlers []HandlerFunc
index int8
}
/************************************/
/********** ROUTES GROUPING *********/
/************************************/
func (engine *Engine) createContext(w http.ResponseWriter, req *http.Request, params httprouter.Params, handlers []HandlerFunc) *Context {
c := engine.cache.Get().(*Context)
c.Writer.reset(w)
c.Request = req
c.Params = params
c.handlers = handlers
c.Keys = nil
c.index = -1
return c
}
/************************************/
/****** FLOW AND ERROR MANAGEMENT****/
/************************************/
func (c *Context) Copy() *Context {
var cp Context = *c
cp.index = AbortIndex
cp.handlers = nil
return &cp
}
// Next should be used only in the middlewares.
// It executes the pending handlers in the chain inside the calling handler.
// See example in github.
func (c *Context) Next() {
c.index++
s := int8(len(c.handlers))
for ; c.index < s; c.index++ {
c.handlers[c.index](c)
}
}
// Forces the system to do not continue calling the pending handlers.
// For example, the first handler checks if the request is authorized. If it's not, context.Abort(401) should be called.
// The rest of pending handlers would never be called for that request.
func (c *Context) Abort(code int) {
if code >= 0 {
c.Writer.WriteHeader(code)
}
c.index = AbortIndex
}
// Fail is the same as Abort plus an error message.
// Calling `context.Fail(500, err)` is equivalent to:
// ```
// context.Error("Operation aborted", err)
// context.Abort(500)
// ```
func (c *Context) Fail(code int, err error) {
c.Error(err, "Operation aborted")
c.Abort(code)
}
func (c *Context) ErrorTyped(err error, typ uint32, meta interface{}) {
c.Errors = append(c.Errors, errorMsg{
Err: err.Error(),
Type: 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) LastError() error {
s := len(c.Errors)
if s > 0 {
return errors.New(c.Errors[s-1].Err)
} else {
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, item interface{}) {
if c.Keys == nil {
c.Keys = make(map[string]interface{})
}
c.Keys[key] = item
}
// Get returns the value for the given key or an error if the key does not exist.
func (c *Context) Get(key string) (interface{}, error) {
if c.Keys != nil {
item, ok := c.Keys[key]
if ok {
return item, nil
}
}
return nil, errors.New("Key does not exist.")
}
// MustGet returns the value for the given key or panics if the value doesn't exist.
func (c *Context) MustGet(key string) interface{} {
value, err := c.Get(key)
if err != nil || value == nil {
log.Panicf("Key %s doesn't exist", key)
}
return value
}
/************************************/
/******** ENCOGING MANAGEMENT********/
/************************************/
// 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 {
var b binding.Binding
ctype := filterFlags(c.Request.Header.Get("Content-Type"))
switch {
case c.Request.Method == "GET" || ctype == MIMEPOSTForm:
b = binding.Form
case ctype == MIMEJSON:
b = binding.JSON
case ctype == MIMEXML || ctype == MIMEXML2:
b = binding.XML
default:
c.Fail(400, errors.New("unknown content-type: "+ctype))
return false
}
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
}
func (c *Context) Render(code int, render render.Render, obj ...interface{}) {
if err := render.Render(c.Writer, code, obj...); err != nil {
c.ErrorTyped(err, ErrorTypeInternal, obj)
c.Abort(500)
}
}
// Serializes the given struct as JSON into the response body in a fast and efficient way.
// It also sets the Content-Type as "application/json".
func (c *Context) JSON(code int, obj interface{}) {
c.Render(code, render.JSON, obj)
}
// Serializes the given struct as XML into the response body in a fast and efficient way.
// It also sets the Content-Type as "application/xml".
func (c *Context) XML(code int, obj interface{}) {
c.Render(code, render.XML, obj)
}
// Renders the HTTP template specified by its file name.
// It also updates the HTTP code and sets the Content-Type as "text/html".
// See http://golang.org/doc/articles/wiki/
func (c *Context) HTML(code int, name string, obj interface{}) {
c.Render(code, c.Engine.HTMLRender, name, obj)
}
// Writes the given string into the response body and sets the Content-Type to "text/plain".
func (c *Context) String(code int, format string, values ...interface{}) {
c.Render(code, render.Plain, format, values)
}
// Writes some data into the body stream and updates the HTTP code.
func (c *Context) Data(code int, contentType string, data []byte) {
if len(contentType) > 0 {
c.Writer.Header().Set("Content-Type", contentType)
}
if code >= 0 {
c.Writer.WriteHeader(code)
}
c.Writer.Write(data)
}

292
gin.go
View File

@ -1,15 +1,9 @@
package gin package gin
import ( import (
"bytes"
"encoding/xml"
"errors"
"fmt"
"github.com/gin-gonic/gin/binding"
"github.com/gin-gonic/gin/render" "github.com/gin-gonic/gin/render"
"github.com/julienschmidt/httprouter" "github.com/julienschmidt/httprouter"
"html/template" "html/template"
"log"
"math" "math"
"net/http" "net/http"
"path" "path"
@ -26,39 +20,9 @@ const (
MIMEPOSTForm = "application/x-www-form-urlencoded" MIMEPOSTForm = "application/x-www-form-urlencoded"
) )
const (
ErrorTypeInternal = 1 << iota
ErrorTypeExternal = 1 << iota
ErrorTypeAll = 0xffffffff
)
type ( type (
HandlerFunc func(*Context) HandlerFunc func(*Context)
H map[string]interface{}
// Used internally to collect errors that occurred during an http request.
errorMsg struct {
Err string `json:"error"`
Type uint32 `json:"-"`
Meta interface{} `json:"meta"`
}
errorMsgs []errorMsg
// Context is the most important part of gin. It allows us to pass variables between middleware,
// manage the flow, validate the JSON of a request and render a JSON response for example.
Context struct {
Request *http.Request
Writer ResponseWriter
Keys map[string]interface{}
Errors errorMsgs
Params httprouter.Params
Engine *Engine
handlers []HandlerFunc
index int8
}
// Used internally to configure router, a RouterGroup is associated with a prefix // Used internally to configure router, a RouterGroup is associated with a prefix
// and an array of handlers (middlewares) // and an array of handlers (middlewares)
RouterGroup struct { RouterGroup struct {
@ -78,55 +42,6 @@ type (
} }
) )
// Allows type H to be used with xml.Marshal
func (h H) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
start.Name = xml.Name{
Space: "",
Local: "map",
}
if err := e.EncodeToken(start); err != nil {
return err
}
for key, value := range h {
elem := xml.StartElement{
Name: xml.Name{Space: "", Local: key},
Attr: []xml.Attr{},
}
if err := e.EncodeElement(value, elem); err != nil {
return err
}
}
if err := e.EncodeToken(xml.EndElement{Name: start.Name}); err != nil {
return err
}
return nil
}
func (a errorMsgs) ByType(typ uint32) errorMsgs {
if len(a) == 0 {
return a
}
result := make(errorMsgs, 0, len(a))
for _, msg := range a {
if msg.Type&typ > 0 {
result = append(result, msg)
}
}
return result
}
func (a errorMsgs) String() string {
if len(a) == 0 {
return ""
}
var buffer bytes.Buffer
for i, msg := range a {
text := fmt.Sprintf("Error #%02d: %s \n Meta: %v\n", (i + 1), msg.Err, msg.Meta)
buffer.WriteString(text)
}
return buffer.String()
}
// Returns a new blank Engine instance without any middleware attached. // Returns a new blank Engine instance without any middleware attached.
// The most basic configuration // The most basic configuration
func New() *Engine { func New() *Engine {
@ -200,32 +115,11 @@ func (engine *Engine) RunTLS(addr string, cert string, key string) {
/********** ROUTES GROUPING *********/ /********** ROUTES GROUPING *********/
/************************************/ /************************************/
func (engine *Engine) createContext(w http.ResponseWriter, req *http.Request, params httprouter.Params, handlers []HandlerFunc) *Context {
c := engine.cache.Get().(*Context)
c.Writer.reset(w)
c.Request = req
c.Params = params
c.handlers = handlers
c.Keys = nil
c.index = -1
return c
}
// Adds middlewares to the group, see example code in github. // Adds middlewares to the group, see example code in github.
func (group *RouterGroup) Use(middlewares ...HandlerFunc) { func (group *RouterGroup) Use(middlewares ...HandlerFunc) {
group.Handlers = append(group.Handlers, middlewares...) group.Handlers = append(group.Handlers, middlewares...)
} }
func joinGroupPath(elems ...string) string {
joined := path.Join(elems...)
lastComponent := elems[len(elems)-1]
// Append a '/' if the last component had one, but only if it's not there already
if len(lastComponent) > 0 && lastComponent[len(lastComponent)-1] == '/' && joined[len(joined)-1] != '/' {
return joined + "/"
}
return joined
}
// Creates a new router group. You should add all the routes that have common middlwares or the same path prefix. // Creates a new router group. You should add all the routes that have common middlwares or the same path prefix.
// For example, all the routes that use a common middlware for authorization could be grouped. // For example, all the routes that use a common middlware for authorization could be grouped.
func (group *RouterGroup) Group(component string, handlers ...HandlerFunc) *RouterGroup { func (group *RouterGroup) Group(component string, handlers ...HandlerFunc) *RouterGroup {
@ -318,189 +212,3 @@ func (group *RouterGroup) combineHandlers(handlers []HandlerFunc) []HandlerFunc
h = append(h, handlers...) h = append(h, handlers...)
return h return h
} }
/************************************/
/****** FLOW AND ERROR MANAGEMENT****/
/************************************/
func (c *Context) Copy() *Context {
var cp Context = *c
cp.index = AbortIndex
cp.handlers = nil
return &cp
}
// Next should be used only in the middlewares.
// It executes the pending handlers in the chain inside the calling handler.
// See example in github.
func (c *Context) Next() {
c.index++
s := int8(len(c.handlers))
for ; c.index < s; c.index++ {
c.handlers[c.index](c)
}
}
// Forces the system to do not continue calling the pending handlers.
// For example, the first handler checks if the request is authorized. If it's not, context.Abort(401) should be called.
// The rest of pending handlers would never be called for that request.
func (c *Context) Abort(code int) {
if code >= 0 {
c.Writer.WriteHeader(code)
}
c.index = AbortIndex
}
// Fail is the same as Abort plus an error message.
// Calling `context.Fail(500, err)` is equivalent to:
// ```
// context.Error("Operation aborted", err)
// context.Abort(500)
// ```
func (c *Context) Fail(code int, err error) {
c.Error(err, "Operation aborted")
c.Abort(code)
}
func (c *Context) ErrorTyped(err error, typ uint32, meta interface{}) {
c.Errors = append(c.Errors, errorMsg{
Err: err.Error(),
Type: 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) LastError() error {
s := len(c.Errors)
if s > 0 {
return errors.New(c.Errors[s-1].Err)
} else {
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, item interface{}) {
if c.Keys == nil {
c.Keys = make(map[string]interface{})
}
c.Keys[key] = item
}
// Get returns the value for the given key or an error if the key does not exist.
func (c *Context) Get(key string) (interface{}, error) {
if c.Keys != nil {
item, ok := c.Keys[key]
if ok {
return item, nil
}
}
return nil, errors.New("Key does not exist.")
}
// MustGet returns the value for the given key or panics if the value doesn't exist.
func (c *Context) MustGet(key string) interface{} {
value, err := c.Get(key)
if err != nil || value == nil {
log.Panicf("Key %s doesn't exist", key)
}
return value
}
/************************************/
/******** ENCOGING MANAGEMENT********/
/************************************/
func filterFlags(content string) string {
for i, a := range content {
if a == ' ' || a == ';' {
return content[:i]
}
}
return content
}
// 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 {
var b binding.Binding
ctype := filterFlags(c.Request.Header.Get("Content-Type"))
switch {
case c.Request.Method == "GET" || ctype == MIMEPOSTForm:
b = binding.Form
case ctype == MIMEJSON:
b = binding.JSON
case ctype == MIMEXML || ctype == MIMEXML2:
b = binding.XML
default:
c.Fail(400, errors.New("unknown content-type: "+ctype))
return false
}
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
}
func (c *Context) Render(code int, render render.Render, obj ...interface{}) {
if err := render.Render(c.Writer, code, obj...); err != nil {
c.ErrorTyped(err, ErrorTypeInternal, obj)
c.Abort(500)
}
}
// Serializes the given struct as JSON into the response body in a fast and efficient way.
// It also sets the Content-Type as "application/json".
func (c *Context) JSON(code int, obj interface{}) {
c.Render(code, render.JSON, obj)
}
// Serializes the given struct as XML into the response body in a fast and efficient way.
// It also sets the Content-Type as "application/xml".
func (c *Context) XML(code int, obj interface{}) {
c.Render(code, render.XML, obj)
}
// Renders the HTTP template specified by its file name.
// It also updates the HTTP code and sets the Content-Type as "text/html".
// See http://golang.org/doc/articles/wiki/
func (c *Context) HTML(code int, name string, obj interface{}) {
c.Render(code, c.Engine.HTMLRender, name, obj)
}
// Writes the given string into the response body and sets the Content-Type to "text/plain".
func (c *Context) String(code int, format string, values ...interface{}) {
c.Render(code, render.Plain, format, values)
}
// Writes some data into the body stream and updates the HTTP code.
func (c *Context) Data(code int, contentType string, data []byte) {
if len(contentType) > 0 {
c.Writer.Header().Set("Content-Type", contentType)
}
if code >= 0 {
c.Writer.WriteHeader(code)
}
c.Writer.Write(data)
}

51
utils.go Normal file
View File

@ -0,0 +1,51 @@
package gin
import (
"encoding/xml"
"path"
)
type H map[string]interface{}
// Allows type H to be used with xml.Marshal
func (h H) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
start.Name = xml.Name{
Space: "",
Local: "map",
}
if err := e.EncodeToken(start); err != nil {
return err
}
for key, value := range h {
elem := xml.StartElement{
Name: xml.Name{Space: "", Local: key},
Attr: []xml.Attr{},
}
if err := e.EncodeElement(value, elem); err != nil {
return err
}
}
if err := e.EncodeToken(xml.EndElement{Name: start.Name}); err != nil {
return err
}
return nil
}
func joinGroupPath(elems ...string) string {
joined := path.Join(elems...)
lastComponent := elems[len(elems)-1]
// Append a '/' if the last component had one, but only if it's not there already
if len(lastComponent) > 0 && lastComponent[len(lastComponent)-1] == '/' && joined[len(joined)-1] != '/' {
return joined + "/"
}
return joined
}
func filterFlags(content string) string {
for i, a := range content {
if a == ' ' || a == ';' {
return content[:i]
}
}
return content
}