negroni

Documentation

Overview

Package negroni is an idiomatic approach to web middleware in Go. It is tiny, non-intrusive, and encourages use of net/http Handlers.

If you like the idea of Martini, but you think it contains too much magic, then Negroni is a great fit.

For a full guide visit http://github.com/urfave/negroni

package main

import (
  "github.com/urfave/negroni"
  "net/http"
  "fmt"
)

func main() {
  mux := http.NewServeMux()
  mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintf(w, "Welcome to the home page!")
  })

  n := negroni.Classic()
  n.UseHandler(mux)
  n.Run(":3000")
}

Index

• type Handler
  • func Wrap(handler http.Handler) Handler
• type HandlerFunc
  • func (h HandlerFunc) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)
• type Logger
  • func NewLogger() *Logger
  • func (l *Logger) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)
• type Negroni
  • func Classic() *Negroni
  • func New(handlers ...Handler) *Negroni
  • func (n *Negroni) Handlers() []Handler
  • func (n *Negroni) Run(addr string)
  • func (n *Negroni) ServeHTTP(rw http.ResponseWriter, r *http.Request)
  • func (n *Negroni) Use(handler Handler)
  • func (n *Negroni) UseFunc(...)
  • func (n *Negroni) UseHandler(handler http.Handler)
  • func (n *Negroni) UseHandlerFunc(handlerFunc func(rw http.ResponseWriter, r *http.Request))
• type Recovery
  • func NewRecovery() *Recovery
  • func (rec *Recovery) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)
• type ResponseWriter
  • func NewResponseWriter(rw http.ResponseWriter) ResponseWriter
• type Static
  • func NewStatic(directory http.FileSystem) *Static
  • func (s *Static) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)

Types

type Handler

type Handler interface {
	ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)
}

Handler handler is an interface that objects can implement to be registered to serve as middleware in the Negroni middleware stack. ServeHTTP should yield to the next middleware in the chain by invoking the next http.HandlerFunc passed in.

If the Handler writes to the ResponseWriter, the next http.HandlerFunc should not be invoked.

func Wrap

func Wrap(handler http.Handler) Handler

Wrap converts a http.Handler into a negroni.Handler so it can be used as a Negroni middleware. The next http.HandlerFunc is automatically called after the Handler is executed.

type HandlerFunc

type HandlerFunc func(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)

HandlerFunc is an adapter to allow the use of ordinary functions as Negroni handlers. If f is a function with the appropriate signature, HandlerFunc(f) is a Handler object that calls f.

func (HandlerFunc) ServeHTTP

func (h HandlerFunc) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)

type Logger

type Logger struct {
	// Logger inherits from log.Logger used to log messages with the Logger middleware
	*log.Logger
}

Logger is a middleware handler that logs the request as it goes in and the response as it goes out.

func NewLogger

func NewLogger() *Logger

NewLogger returns a new Logger instance

func (*Logger) ServeHTTP

func (l *Logger) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)

type Negroni

type Negroni struct {
	// contains filtered or unexported fields
}

Negroni is a stack of Middleware Handlers that can be invoked as an http.Handler. Negroni middleware is evaluated in the order that they are added to the stack using the Use and UseHandler methods.

func Classic

func Classic() *Negroni

Classic returns a new Negroni instance with the default middleware already in the stack.

Recovery - Panic Recovery Middleware Logger - Request/Response Logging Static - Static File Serving

func New

func New(handlers ...Handler) *Negroni

New returns a new Negroni instance with no middleware preconfigured.

func (*Negroni) Handlers

func (n *Negroni) Handlers() []Handler

Returns a list of all the handlers in the current Negroni middleware chain.

func (*Negroni) Run

func (n *Negroni) Run(addr string)

Run is a convenience function that runs the negroni stack as an HTTP server. The addr string takes the same format as http.ListenAndServe.

func (*Negroni) ServeHTTP

func (n *Negroni) ServeHTTP(rw http.ResponseWriter, r *http.Request)

func (*Negroni) Use

func (n *Negroni) Use(handler Handler)

Use adds a Handler onto the middleware stack. Handlers are invoked in the order they are added to a Negroni.

func (*Negroni) UseFunc

func (n *Negroni) UseFunc(handlerFunc func(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc))

UseFunc adds a Negroni-style handler function onto the middleware stack.

func (*Negroni) UseHandler

func (n *Negroni) UseHandler(handler http.Handler)

UseHandler adds a http.Handler onto the middleware stack. Handlers are invoked in the order they are added to a Negroni.

func (*Negroni) UseHandlerFunc

func (n *Negroni) UseHandlerFunc(handlerFunc func(rw http.ResponseWriter, r *http.Request))

UseHandler adds a http.HandlerFunc-style handler function onto the middleware stack.

type Recovery

type Recovery struct {
	Logger           *log.Logger
	PrintStack       bool
	ErrorHandlerFunc func(interface{})
	StackAll         bool
	StackSize        int
}

Recovery is a Negroni middleware that recovers from any panics and writes a 500 if there was one.

func NewRecovery

func NewRecovery() *Recovery

NewRecovery returns a new instance of Recovery

func (*Recovery) ServeHTTP

func (rec *Recovery) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)

type ResponseWriter

type ResponseWriter interface {
	http.ResponseWriter
	http.Flusher
	// Status returns the status code of the response or 200 if the response has
	// not been written (as this is the default response code in net/http)
	Status() int
	// Written returns whether or not the ResponseWriter has been written.
	Written() bool
	// Size returns the size of the response body.
	Size() int
	// Before allows for a function to be called before the ResponseWriter has been written to. This is
	// useful for setting headers or any other operations that must happen before a response has been written.
	Before(func(ResponseWriter))
}

ResponseWriter is a wrapper around http.ResponseWriter that provides extra information about the response. It is recommended that middleware handlers use this construct to wrap a responsewriter if the functionality calls for it.

func NewResponseWriter

func NewResponseWriter(rw http.ResponseWriter) ResponseWriter

NewResponseWriter creates a ResponseWriter that wraps an http.ResponseWriter

type Static

type Static struct {
	// Dir is the directory to serve static files from
	Dir http.FileSystem
	// Prefix is the optional prefix used to serve the static directory content
	Prefix string
	// IndexFile defines which file to serve as index if it exists.
	IndexFile string
}

Static is a middleware handler that serves static files in the given directory/filesystem. If the file does not exist on the filesystem, it passes along to the next middleware in the chain. If you desire "fileserver" type behavior where it returns a 404 for unfound files, you should consider using http.FileServer from the Go stdlib.

func NewStatic

func NewStatic(directory http.FileSystem) *Static

NewStatic returns a new instance of Static

func (*Static) ServeHTTP

func (s *Static) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc)