// +build go1.3 // Copyright 2014 The Macaron Authors // // 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 macaron is a high productive and modular web framework in Go. package macaron import ( "io" "log" "net/http" "os" "reflect" "strings" "sync" "github.com/Unknwon/com" "gopkg.in/ini.v1" "github.com/go-macaron/inject" ) const _VERSION = "1.2.1.0219" func Version() string { return _VERSION } // Handler can be any callable function. // Macaron attempts to inject services into the handler's argument list, // and panics if an argument could not be fullfilled via dependency injection. type Handler interface{} // handlerFuncInvoker is an inject.FastInvoker wrapper of func(http.ResponseWriter, *http.Request). type handlerFuncInvoker func(http.ResponseWriter, *http.Request) func (invoke handlerFuncInvoker) Invoke(params []interface{}) ([]reflect.Value, error) { invoke(params[0].(http.ResponseWriter), params[1].(*http.Request)) return nil, nil } // internalServerErrorInvoker is an inject.FastInvoker wrapper of func(rw http.ResponseWriter, err error). type internalServerErrorInvoker func(rw http.ResponseWriter, err error) func (invoke internalServerErrorInvoker) Invoke(params []interface{}) ([]reflect.Value, error) { invoke(params[0].(http.ResponseWriter), params[1].(error)) return nil, nil } // validateAndWrapHandler makes sure a handler is a callable function, it panics if not. // When the handler is also potential to be any built-in inject.FastInvoker, // it wraps the handler automatically to have some performance gain. func validateAndWrapHandler(h Handler) Handler { if reflect.TypeOf(h).Kind() != reflect.Func { panic("Macaron handler must be a callable function") } if !inject.IsFastInvoker(h) { switch v := h.(type) { case func(*Context): return ContextInvoker(v) case func(*Context, *log.Logger): return LoggerInvoker(v) case func(http.ResponseWriter, *http.Request): return handlerFuncInvoker(v) case func(http.ResponseWriter, error): return internalServerErrorInvoker(v) } } return h } // validateAndWrapHandlers preforms validation and wrapping for each input handler. // It accepts an optional wrapper function to perform custom wrapping on handlers. func validateAndWrapHandlers(handlers []Handler, wrappers ...func(Handler) Handler) []Handler { var wrapper func(Handler) Handler if len(wrappers) > 0 { wrapper = wrappers[0] } wrappedHandlers := make([]Handler, len(handlers)) for i, h := range handlers { h = validateAndWrapHandler(h) if wrapper != nil && !inject.IsFastInvoker(h) { h = wrapper(h) } wrappedHandlers[i] = h } return wrappedHandlers } // Macaron represents the top level web application. // inject.Injector methods can be invoked to map services on a global level. type Macaron struct { inject.Injector befores []BeforeHandler handlers []Handler action Handler hasURLPrefix bool urlPrefix string // For suburl support. *Router logger *log.Logger } // NewWithLogger creates a bare bones Macaron instance. // Use this method if you want to have full control over the middleware that is used. // You can specify logger output writer with this function. func NewWithLogger(out io.Writer) *Macaron { m := &Macaron{ Injector: inject.New(), action: func() {}, Router: NewRouter(), logger: log.New(out, "[Macaron] ", 0), } m.Router.m = m m.Map(m.logger) m.Map(defaultReturnHandler()) m.NotFound(http.NotFound) m.InternalServerError(func(rw http.ResponseWriter, err error) { http.Error(rw, err.Error(), 500) }) return m } // New creates a bare bones Macaron instance. // Use this method if you want to have full control over the middleware that is used. func New() *Macaron { return NewWithLogger(os.Stdout) } // Classic creates a classic Macaron with some basic default middleware: // macaron.Logger, macaron.Recovery and macaron.Static. func Classic() *Macaron { m := New() m.Use(Logger()) m.Use(Recovery()) m.Use(Static("public")) return m } // Handlers sets the entire middleware stack with the given Handlers. // This will clear any current middleware handlers, // and panics if any of the handlers is not a callable function func (m *Macaron) Handlers(handlers ...Handler) { m.handlers = make([]Handler, 0) for _, handler := range handlers { m.Use(handler) } } // Action sets the handler that will be called after all the middleware has been invoked. // This is set to macaron.Router in a macaron.Classic(). func (m *Macaron) Action(handler Handler) { handler = validateAndWrapHandler(handler) m.action = handler } // BeforeHandler represents a handler executes at beginning of every request. // Macaron stops future process when it returns true. type BeforeHandler func(rw http.ResponseWriter, req *http.Request) bool func (m *Macaron) Before(handler BeforeHandler) { m.befores = append(m.befores, handler) } // Use adds a middleware Handler to the stack, // and panics if the handler is not a callable func. // Middleware Handlers are invoked in the order that they are added. func (m *Macaron) Use(handler Handler) { handler = validateAndWrapHandler(handler) m.handlers = append(m.handlers, handler) } func (m *Macaron) createContext(rw http.ResponseWriter, req *http.Request) *Context { c := &Context{ Injector: inject.New(), handlers: m.handlers, action: m.action, index: 0, Router: m.Router, Req: Request{req}, Resp: NewResponseWriter(rw), Render: &DummyRender{rw}, Data: make(map[string]interface{}), } c.SetParent(m) c.Map(c) c.MapTo(c.Resp, (*http.ResponseWriter)(nil)) c.Map(req) return c } // ServeHTTP is the HTTP Entry point for a Macaron instance. // Useful if you want to control your own HTTP server. // Be aware that none of middleware will run without registering any router. func (m *Macaron) ServeHTTP(rw http.ResponseWriter, req *http.Request) { if m.hasURLPrefix { req.URL.Path = strings.TrimPrefix(req.URL.Path, m.urlPrefix) } for _, h := range m.befores { if h(rw, req) { return } } m.Router.ServeHTTP(rw, req) } func GetDefaultListenInfo() (string, int) { host := os.Getenv("HOST") if len(host) == 0 { host = "0.0.0.0" } port := com.StrTo(os.Getenv("PORT")).MustInt() if port == 0 { port = 4000 } return host, port } // Run the http server. Listening on os.GetEnv("PORT") or 4000 by default. func (m *Macaron) Run(args ...interface{}) { host, port := GetDefaultListenInfo() if len(args) == 1 { switch arg := args[0].(type) { case string: host = arg case int: port = arg } } else if len(args) >= 2 { if arg, ok := args[0].(string); ok { host = arg } if arg, ok := args[1].(int); ok { port = arg } } addr := host + ":" + com.ToStr(port) logger := m.GetVal(reflect.TypeOf(m.logger)).Interface().(*log.Logger) logger.Printf("listening on %s (%s)\n", addr, safeEnv()) logger.Fatalln(http.ListenAndServe(addr, m)) } // SetURLPrefix sets URL prefix of router layer, so that it support suburl. func (m *Macaron) SetURLPrefix(prefix string) { m.urlPrefix = prefix m.hasURLPrefix = len(m.urlPrefix) > 0 } // ____ ____ .__ ___. .__ // \ \ / /____ _______|__|____ \_ |__ | | ____ ______ // \ Y /\__ \\_ __ \ \__ \ | __ \| | _/ __ \ / ___/ // \ / / __ \| | \/ |/ __ \| \_\ \ |_\ ___/ \___ \ // \___/ (____ /__| |__(____ /___ /____/\___ >____ > // \/ \/ \/ \/ \/ const ( DEV = "development" PROD = "production" TEST = "test" ) var ( // Env is the environment that Macaron is executing in. // The MACARON_ENV is read on initialization to set this variable. Env = DEV envLock sync.Mutex // Path of work directory. Root string // Flash applies to current request. FlashNow bool // Configuration convention object. cfg *ini.File ) func setENV(e string) { envLock.Lock() defer envLock.Unlock() if len(e) > 0 { Env = e } } func safeEnv() string { envLock.Lock() defer envLock.Unlock() return Env } func init() { setENV(os.Getenv("MACARON_ENV")) var err error Root, err = os.Getwd() if err != nil { panic("error getting work directory: " + err.Error()) } } // SetConfig sets data sources for configuration. func SetConfig(source interface{}, others ...interface{}) (_ *ini.File, err error) { cfg, err = ini.Load(source, others...) return Config(), err } // Config returns configuration convention object. // It returns an empty object if there is no one available. func Config() *ini.File { if cfg == nil { return ini.Empty() } return cfg }