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echo.go
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echo.go
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package echo
import (
"errors"
"fmt"
"io"
"net/http"
"net/url"
"reflect"
"regexp"
"runtime"
"strings"
"sync"
"github.com/admpub/log"
"github.com/webx-top/echo/engine"
"github.com/webx-top/echo/logger"
)
type (
Echo struct {
engine engine.Engine
prefix string
middleware []interface{}
head Handler
maxParam *int
notFoundHandler HandlerFunc
httpErrorHandler HTTPErrorHandler
binder Binder
renderer Renderer
pool sync.Pool
debug bool
router *Router
logger logger.Logger
meta map[string]H
handlerWrapper []func(interface{}) Handler
middlewareWrapper []func(interface{}) Middleware
FuncMap map[string]interface{}
}
Route struct {
Method string
Path string
Handler Handler `json:"-" xml:"-"`
HandlerName string
Format string
Params []string
Prefix string
Meta H
}
HTTPError struct {
Code int
Message string
}
Middleware interface {
Handle(Handler) Handler
}
MiddlewareFunc func(Handler) Handler
MiddlewareFuncd func(Handler) HandlerFunc
Handler interface {
Handle(Context) error
}
HandleNamer interface {
HandleName() string
}
HandlerFunc func(Context) error
// HTTPErrorHandler is a centralized HTTP error handler.
HTTPErrorHandler func(error, Context)
// Validator is the interface that wraps the Validate method.
Validator interface {
Validate() error
}
// Renderer is the interface that wraps the Render method.
Renderer interface {
Render(w io.Writer, name string, data interface{}, c Context) error
}
)
const (
// CONNECT HTTP method
CONNECT = "CONNECT"
// DELETE HTTP method
DELETE = "DELETE"
// GET HTTP method
GET = "GET"
// HEAD HTTP method
HEAD = "HEAD"
// OPTIONS HTTP method
OPTIONS = "OPTIONS"
// PATCH HTTP method
PATCH = "PATCH"
// POST HTTP method
POST = "POST"
// PUT HTTP method
PUT = "PUT"
// TRACE HTTP method
TRACE = "TRACE"
//-------------
// Media types
//-------------
MIMEApplicationJSON = "application/json"
MIMEApplicationJSONCharsetUTF8 = MIMEApplicationJSON + "; " + CharsetUTF8
MIMEApplicationJavaScript = "application/javascript"
MIMEApplicationJavaScriptCharsetUTF8 = MIMEApplicationJavaScript + "; " + CharsetUTF8
MIMEApplicationXML = "application/xml"
MIMEApplicationXMLCharsetUTF8 = MIMEApplicationXML + "; " + CharsetUTF8
MIMEApplicationForm = "application/x-www-form-urlencoded"
MIMEApplicationProtobuf = "application/protobuf"
MIMEApplicationMsgpack = "application/msgpack"
MIMETextHTML = "text/html"
MIMETextHTMLCharsetUTF8 = MIMETextHTML + "; " + CharsetUTF8
MIMETextPlain = "text/plain"
MIMETextPlainCharsetUTF8 = MIMETextPlain + "; " + CharsetUTF8
MIMEMultipartForm = "multipart/form-data"
MIMEOctetStream = "application/octet-stream"
MIMEEventStream = "text/event-stream"
//---------
// Charset
//---------
CharsetUTF8 = "charset=utf-8"
//---------
// Headers
//---------
HeaderAcceptEncoding = "Accept-Encoding"
HeaderAuthorization = "Authorization"
HeaderContentDisposition = "Content-Disposition"
HeaderContentEncoding = "Content-Encoding"
HeaderContentLength = "Content-Length"
HeaderContentType = "Content-Type"
HeaderIfModifiedSince = "If-Modified-Since"
HeaderCookie = "Cookie"
HeaderSetCookie = "Set-Cookie"
HeaderLastModified = "Last-Modified"
HeaderLocation = "Location"
HeaderUpgrade = "Upgrade"
HeaderVary = "Vary"
HeaderWWWAuthenticate = "WWW-Authenticate"
HeaderXForwardedProto = "X-Forwarded-Proto"
HeaderXHTTPMethodOverride = "X-HTTP-Method-Override"
HeaderXForwardedFor = "X-Forwarded-For"
HeaderXRealIP = "X-Real-IP"
HeaderServer = "Server"
HeaderOrigin = "Origin"
HeaderAccessControlRequestMethod = "Access-Control-Request-Method"
HeaderAccessControlRequestHeaders = "Access-Control-Request-Headers"
HeaderAccessControlAllowOrigin = "Access-Control-Allow-Origin"
HeaderAccessControlAllowMethods = "Access-Control-Allow-Methods"
HeaderAccessControlAllowHeaders = "Access-Control-Allow-Headers"
HeaderAccessControlAllowCredentials = "Access-Control-Allow-Credentials"
HeaderAccessControlExposeHeaders = "Access-Control-Expose-Headers"
HeaderAccessControlMaxAge = "Access-Control-Max-Age"
// Security
HeaderStrictTransportSecurity = "Strict-Transport-Security"
HeaderXContentTypeOptions = "X-Content-Type-Options"
HeaderXXSSProtection = "X-XSS-Protection"
HeaderXFrameOptions = "X-Frame-Options"
HeaderContentSecurityPolicy = "Content-Security-Policy"
HeaderXCSRFToken = "X-CSRF-Token"
)
var (
httpMethodRegexp = regexp.MustCompile(`[^A-Z]+`)
methods = []string{
CONNECT,
DELETE,
GET,
HEAD,
OPTIONS,
PATCH,
POST,
PUT,
TRACE,
}
//--------
// Errors
//--------
ErrUnsupportedMediaType error = NewHTTPError(http.StatusUnsupportedMediaType)
ErrNotFound error = NewHTTPError(http.StatusNotFound)
ErrUnauthorized error = NewHTTPError(http.StatusUnauthorized)
ErrStatusRequestEntityTooLarge error = NewHTTPError(http.StatusRequestEntityTooLarge)
ErrMethodNotAllowed error = NewHTTPError(http.StatusMethodNotAllowed)
ErrRendererNotRegistered = errors.New("renderer not registered")
ErrInvalidRedirectCode = errors.New("invalid redirect status code")
//----------------
// Error handlers
//----------------
NotFoundHandler = HandlerFunc(func(c Context) error {
return ErrNotFound
})
MethodNotAllowedHandler = HandlerFunc(func(c Context) error {
return ErrMethodNotAllowed
})
_ MiddlewareFuncd = func(h Handler) HandlerFunc {
return func(c Context) error {
return h.Handle(c)
}
}
)
// New creates an instance of Echo.
func New() (e *Echo) {
return NewWithContext(func(e *Echo) Context {
return NewContext(nil, nil, e)
})
}
func NewWithContext(fn func(*Echo) Context) (e *Echo) {
e = &Echo{maxParam: new(int)}
e.pool.New = func() interface{} {
return fn(e)
}
e.router = NewRouter(e)
e.meta = map[string]H{}
//----------
// Defaults
//----------
e.SetHTTPErrorHandler(e.DefaultHTTPErrorHandler)
e.SetBinder(&binder{Echo: e})
// Logger
e.logger = log.GetLogger("echo")
return
}
func (m MiddlewareFunc) Handle(h Handler) Handler {
return m(h)
}
func (m MiddlewareFunc) SetMeta(e *Echo, meta H) MiddlewareFunc {
e.meta[HandlerName(m)] = meta
return m
}
func (m MiddlewareFuncd) Handle(h Handler) Handler {
return m(h)
}
func (m MiddlewareFuncd) SetMeta(e *Echo, meta H) MiddlewareFuncd {
e.meta[HandlerName(m)] = meta
return m
}
func (h HandlerFunc) Handle(c Context) error {
return h(c)
}
func (h HandlerFunc) SetMeta(e *Echo, meta H) HandlerFunc {
e.meta[HandlerName(h)] = meta
return h
}
// Router returns router.
func (e *Echo) Router() *Router {
return e.router
}
// SetLogger sets the logger instance.
func (e *Echo) SetLogger(l logger.Logger) {
e.logger = l
}
// Logger returns the logger instance.
func (e *Echo) Logger() logger.Logger {
return e.logger
}
// DefaultHTTPErrorHandler invokes the default HTTP error handler.
func (e *Echo) DefaultHTTPErrorHandler(err error, c Context) {
code := http.StatusInternalServerError
msg := http.StatusText(code)
if he, ok := err.(*HTTPError); ok {
code = he.Code
msg = he.Message
}
if e.debug {
msg = err.Error()
}
if !c.Response().Committed() {
if c.Request().Method() == HEAD {
c.NoContent(code)
} else {
if code > 0 {
c.String(msg, code)
} else {
c.String(msg)
}
}
}
e.logger.Debug(err)
}
// SetHTTPErrorHandler registers a custom Echo.HTTPErrorHandler.
func (e *Echo) SetHTTPErrorHandler(h HTTPErrorHandler) {
e.httpErrorHandler = h
}
// SetBinder registers a custom binder. It's invoked by Context.Bind().
func (e *Echo) SetBinder(b Binder) {
e.binder = b
}
// Binder returns the binder instance.
func (e *Echo) Binder() Binder {
return e.binder
}
// SetRenderer registers an HTML template renderer. It's invoked by Context.Render().
func (e *Echo) SetRenderer(r Renderer) {
e.renderer = r
}
// SetDebug enable/disable debug mode.
func (e *Echo) SetDebug(on bool) {
e.debug = on
if logger, ok := e.logger.(logger.LevelSetter); ok {
if on {
logger.SetLevel(`Debug`)
} else {
logger.SetLevel(`Info`)
}
}
}
// Debug returns debug mode (enabled or disabled).
func (e *Echo) Debug() bool {
return e.debug
}
// Use adds handler to the middleware chain.
func (e *Echo) Use(middleware ...interface{}) {
for _, m := range middleware {
e.ValidMiddleware(m)
e.middleware = append(e.middleware, m)
}
}
// Pre is alias
func (e *Echo) Pre(middleware ...interface{}) {
e.PreUse(middleware...)
}
// PreUse adds handler to the middleware chain.
func (e *Echo) PreUse(middleware ...interface{}) {
var middlewares []interface{}
for _, m := range middleware {
e.ValidMiddleware(m)
middlewares = append(middlewares, m)
}
e.middleware = append(middlewares, e.middleware...)
}
// Connect adds a CONNECT route > handler to the router.
func (e *Echo) Connect(path string, h interface{}, m ...interface{}) {
e.add(CONNECT, path, h, m...)
}
// Delete adds a DELETE route > handler to the router.
func (e *Echo) Delete(path string, h interface{}, m ...interface{}) {
e.add(DELETE, path, h, m...)
}
// Get adds a GET route > handler to the router.
func (e *Echo) Get(path string, h interface{}, m ...interface{}) {
e.add(GET, path, h, m...)
}
// Head adds a HEAD route > handler to the router.
func (e *Echo) Head(path string, h interface{}, m ...interface{}) {
e.add(HEAD, path, h, m...)
}
// Options adds an OPTIONS route > handler to the router.
func (e *Echo) Options(path string, h interface{}, m ...interface{}) {
e.add(OPTIONS, path, h, m...)
}
// Patch adds a PATCH route > handler to the router.
func (e *Echo) Patch(path string, h interface{}, m ...interface{}) {
e.add(PATCH, path, h, m...)
}
// Post adds a POST route > handler to the router.
func (e *Echo) Post(path string, h interface{}, m ...interface{}) {
e.add(POST, path, h, m...)
}
// Put adds a PUT route > handler to the router.
func (e *Echo) Put(path string, h interface{}, m ...interface{}) {
e.add(PUT, path, h, m...)
}
// Trace adds a TRACE route > handler to the router.
func (e *Echo) Trace(path string, h interface{}, m ...interface{}) {
e.add(TRACE, path, h, m...)
}
// Any adds a route > handler to the router for all HTTP methods.
func (e *Echo) Any(path string, h interface{}, middleware ...interface{}) {
for _, m := range methods {
e.add(m, path, h, middleware...)
}
}
func (e *Echo) Route(methods string, path string, h interface{}, middleware ...interface{}) {
e.Match(httpMethodRegexp.Split(methods, -1), path, h, middleware...)
}
// Match adds a route > handler to the router for multiple HTTP methods provided.
func (e *Echo) Match(methods []string, path string, h interface{}, middleware ...interface{}) {
for _, m := range methods {
e.add(m, path, h, middleware...)
}
}
func (e *Echo) ValidHandler(v interface{}) (h Handler) {
if e.handlerWrapper != nil {
for _, wrapper := range e.handlerWrapper {
h = wrapper(v)
if h != nil {
return
}
}
}
return WrapHandler(v)
}
func (e *Echo) ValidMiddleware(v interface{}) (m Middleware) {
if e.middlewareWrapper != nil {
for _, wrapper := range e.middlewareWrapper {
m = wrapper(v)
if m != nil {
return
}
}
}
return WrapMiddleware(v)
}
func (e *Echo) SetHandlerWrapper(funcs ...func(interface{}) Handler) {
e.handlerWrapper = funcs
}
func (e *Echo) SetMiddlewareWrapper(funcs ...func(interface{}) Middleware) {
e.middlewareWrapper = funcs
}
func (e *Echo) AddHandlerWrapper(funcs ...func(interface{}) Handler) {
e.handlerWrapper = append(e.handlerWrapper, funcs...)
}
func (e *Echo) AddMiddlewareWrapper(funcs ...func(interface{}) Middleware) {
e.middlewareWrapper = append(e.middlewareWrapper, funcs...)
}
func (e *Echo) Prefix() string {
return e.prefix
}
func (e *Echo) add(method, path string, h interface{}, middleware ...interface{}) {
handler := e.ValidHandler(h)
if handler == nil {
return
}
var name string
if hn, ok := handler.(HandleNamer); ok {
name = hn.HandleName()
} else {
name = HandlerName(handler)
}
meta := H{}
for i := len(middleware) - 1; i >= 0; i-- {
m := middleware[i]
e.addMeta(meta, HandlerName(m))
mw := e.ValidMiddleware(m)
handler = mw.Handle(handler)
}
e.addMeta(meta, name)
hdl := HandlerFunc(func(c Context) error {
return handler.Handle(c)
})
fpath, pnames := e.router.Add(method, path, hdl, e)
e.logger.Debugf(`Route: %7v %-30v -> %v`, method, fpath, name)
r := &Route{
Method: method,
Path: path,
Handler: hdl,
HandlerName: name,
Format: fpath,
Params: pnames,
Meta: meta,
}
if _, ok := e.router.nroute[name]; !ok {
e.router.nroute[name] = []int{len(e.router.routes)}
} else {
e.router.nroute[name] = append(e.router.nroute[name], len(e.router.routes))
}
e.router.routes = append(e.router.routes, r)
}
func (e *Echo) addMeta(meta H, handler string) {
if m, ok := e.meta[handler]; ok {
meta.DeepMerge(m)
}
}
// MetaMiddleware Add meta information about endpoint
func (e *Echo) MetaMiddleware(m H, middleware interface{}) interface{} {
name := HandlerName(middleware)
e.meta[name] = m
return middleware
}
// MetaHandler Add meta information about endpoint
func (e *Echo) MetaHandler(m H, handler interface{}) interface{} {
name := HandlerName(handler)
e.meta[name] = m
return handler
}
// RebuildRouter rebuild router
func (e *Echo) RebuildRouter(args ...[]*Route) {
routes := e.router.routes
if len(args) > 0 {
routes = args[0]
}
e.router = NewRouter(e)
for index, r := range routes {
//e.logger.Debugf(`%p rebuild: %#v`, e, *r)
e.router.Add(r.Method, r.Path, r.Handler, e)
if _, ok := e.router.nroute[r.HandlerName]; !ok {
e.router.nroute[r.HandlerName] = []int{index}
} else {
e.router.nroute[r.HandlerName] = append(e.router.nroute[r.HandlerName], index)
}
}
e.router.routes = routes
e.head = nil
}
// AppendRouter append router
func (e *Echo) AppendRouter(routes []*Route) {
for index, r := range routes {
e.router.Add(r.Method, r.Path, r.Handler, e)
index = len(e.router.routes)
if _, ok := e.router.nroute[r.HandlerName]; !ok {
e.router.nroute[r.HandlerName] = []int{index}
} else {
e.router.nroute[r.HandlerName] = append(e.router.nroute[r.HandlerName], index)
}
e.router.routes = append(e.router.routes, r)
}
e.head = nil
}
// Group creates a new sub-router with prefix.
func (e *Echo) Group(prefix string, m ...interface{}) (g *Group) {
g = &Group{prefix: prefix, echo: e}
g.Use(m...)
return
}
// URI generates a URI from handler.
func (e *Echo) URI(handler interface{}, params ...interface{}) string {
var uri, name string
if h, ok := handler.(Handler); ok {
if hn, ok := h.(HandleNamer); ok {
name = hn.HandleName()
} else {
name = HandlerName(h)
}
} else if h, ok := handler.(string); ok {
name = h
} else {
return uri
}
if indexes, ok := e.router.nroute[name]; ok && len(indexes) > 0 {
r := e.router.routes[indexes[0]]
length := len(params)
if length == 1 {
switch val := params[0].(type) {
case url.Values:
uri = r.Path
for _, name := range r.Params {
tag := `:` + name
v := val.Get(name)
uri = strings.Replace(uri, tag+`/`, v+`/`, -1)
if strings.HasSuffix(uri, tag) {
uri = strings.TrimSuffix(uri, tag) + v
}
val.Del(name)
}
q := val.Encode()
if len(q) > 0 {
uri += `?` + q
}
case map[string]string:
uri = r.Path
for _, name := range r.Params {
tag := `:` + name
v, _ := val[name]
uri = strings.Replace(uri, tag+`/`, v+`/`, -1)
if strings.HasSuffix(uri, tag) {
uri = strings.TrimSuffix(uri, tag) + v
}
}
case []interface{}:
uri = fmt.Sprintf(r.Format, val...)
default:
uri = fmt.Sprintf(r.Format, val)
}
} else {
uri = fmt.Sprintf(r.Format, params...)
}
}
return uri
}
// URL is an alias for `URI` function.
func (e *Echo) URL(h interface{}, params ...interface{}) string {
return e.URI(h, params...)
}
// Routes returns the registered routes.
func (e *Echo) Routes() []*Route {
return e.router.routes
}
// NamedRoutes returns the registered handler name.
func (e *Echo) NamedRoutes() map[string][]int {
return e.router.nroute
}
// Chain middleware
func (e *Echo) chainMiddleware() {
if e.head != nil {
return
}
e.head = e.router.Handle(nil)
for i := len(e.middleware) - 1; i >= 0; i-- {
e.head = e.ValidMiddleware(e.middleware[i]).Handle(e.head)
}
}
func (e *Echo) ServeHTTP(req engine.Request, res engine.Response) {
c := e.pool.Get().(Context)
c.Reset(req, res)
e.chainMiddleware()
if err := e.head.Handle(c); err != nil {
c.Error(err)
}
e.pool.Put(c)
}
// Run starts the HTTP engine.
func (e *Echo) Run(eng engine.Engine, handler ...engine.Handler) {
e.setEngine(eng).start(handler...)
}
func (e *Echo) start(handler ...engine.Handler) {
if len(handler) > 0 {
e.engine.SetHandler(handler[0])
} else {
e.engine.SetHandler(e)
}
e.engine.SetLogger(e.logger)
if e.Debug() {
e.logger.Debug("running in debug mode")
}
e.engine.Start()
}
func (e *Echo) setEngine(eng engine.Engine) *Echo {
e.engine = eng
return e
}
func (e *Echo) Engine() engine.Engine {
return e.engine
}
// Stop stops the HTTP server.
func (e *Echo) Stop() error {
if e.engine == nil {
return nil
}
return e.engine.Stop()
}
func NewHTTPError(code int, msg ...string) *HTTPError {
he := &HTTPError{Code: code, Message: http.StatusText(code)}
if len(msg) > 0 {
he.Message = msg[0]
}
return he
}
// Error returns message.
func (e *HTTPError) Error() string {
return e.Message
}
// HandlerName returns the handler name
func HandlerName(h interface{}) string {
v := reflect.ValueOf(h)
t := v.Type()
if t.Kind() == reflect.Func {
return runtime.FuncForPC(v.Pointer()).Name()
}
return t.String()
}
// Methods returns methods
func Methods() []string {
return methods
}