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Make social videos in an instant: use custom templates to tell the right story for your business.
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gorilla/mux: A powerful HTTP router and URL matcher for building Go web...
Juice WRLD – Go Pro Lyrics | Genius Lyrics
breakout go go - Instant Sound Effect Button | Myinstants
elithrar
build: CircleCI 2.1 + build matrix ( #595 )
build: CircleCI 2.1 + build matrix ( #595 )
Update LICENSE & AUTHORS files. ( #386 )
Update LICENSE & AUTHORS files. ( #386 )
Update README (self-host logo) ( #513 )
Fixing Regexp in the benchmark test ( #234 )
Fix nil panic in authentication middleware example ( #489 )
Improve CORS Method Middleware ( #477 )
[docs] Add example usage for Route.HeadersRegexp ( #320 )
[docs] Add documentation for using mux to serve a SPA ( #493 )
Fix the CORSMethodMiddleware bug with subrouters
Fix the CORSMethodMiddleware bug with subrouters
docs: Remove stale text from comment. ( #568 )
Guess the scheme if r.URL.Scheme is unset ( #474 )
fix: regression in vars extract for wildcard host ( #579 )
fix: regression in vars extract for wildcard host ( #579 )
perf: reduce allocations in (*routeRegexp).getURLQuery ( #544 )
Guess the scheme if r.URL.Scheme is unset ( #474 )
Remove/cleanup request context helpers ( #525 )
func main () {
r := mux . NewRouter ()
r . HandleFunc ( "/" , HomeHandler )
r . HandleFunc ( "/products" , ProductsHandler )
r . HandleFunc ( "/articles" , ArticlesHandler )
http . Handle ( "/" , r )
}
r := mux . NewRouter ()
r . HandleFunc ( "/products/{key}" , ProductHandler )
r . HandleFunc ( "/articles/{category}/" , ArticlesCategoryHandler )
r . HandleFunc ( "/articles/{category}/{id:[0-9]+}" , ArticleHandler )
func ArticlesCategoryHandler ( w http. ResponseWriter , r * http. Request ) {
vars := mux . Vars ( r )
w . WriteHeader ( http . StatusOK )
fmt . Fprintf ( w , "Category: %v \n " , vars [ "category" ])
}
r := mux . NewRouter ()
// Only matches if domain is "www.example.com".
r . Host ( "www.example.com" )
// Matches a dynamic subdomain.
r . Host ( "{subdomain:[a-z]+}.example.com" )
r . Headers ( "X-Requested-With" , "XMLHttpRequest" )
r . MatcherFunc ( func ( r * http. Request , rm * RouteMatch ) bool {
return r . ProtoMajor == 0
})
r . HandleFunc ( "/products" , ProductsHandler ).
Host ( "www.example.com" ).
Methods ( "GET" ).
Schemes ( "http" )
r := mux . NewRouter ()
r . HandleFunc ( "/specific" , specificHandler )
r . PathPrefix ( "/" ). Handler ( catchAllHandler )
r := mux . NewRouter ()
s := r . Host ( "www.example.com" ). Subrouter ()
s . HandleFunc ( "/products/" , ProductsHandler )
s . HandleFunc ( "/products/{key}" , ProductHandler )
s . HandleFunc ( "/articles/{category}/{id:[0-9]+}" , ArticleHandler )
r := mux . NewRouter ()
s := r . PathPrefix ( "/products" ). Subrouter ()
// "/products/"
s . HandleFunc ( "/" , ProductsHandler )
// "/products/{key}/"
s . HandleFunc ( "/{key}/" , ProductHandler )
// "/products/{key}/details"
s . HandleFunc ( "/{key}/details" , ProductDetailsHandler )
func main () {
var dir string
flag . StringVar ( & dir , "dir" , "." , "the directory to serve files from. Defaults to the current dir" )
flag . Parse ()
r := mux . NewRouter ()
// This will serve files under http://localhost:8000/static/
r . PathPrefix ( "/static/" ). Handler ( http . StripPrefix ( "/static/" , http . FileServer ( http . Dir ( dir ))))
srv := & http. Server {
Handler : r ,
Addr : "127.0.0.1:8000" ,
// Good practice: enforce timeouts for servers you create!
WriteTimeout : 15 * time . Second ,
ReadTimeout : 15 * time . Second ,
}
log . Fatal ( srv . ListenAndServe ())
}
package main
import (
"encoding/json"
"log"
"net/http"
"os"
"path/filepath"
"time"
"github.com/gorilla/mux"
)
// spaHandler implements the http.Handler interface, so we can use it
// to respond to HTTP requests. The path to the static directory and
// path to the index file within that static directory are used to
// serve the SPA in the given static directory.
type spaHandler struct {
staticPath string
indexPath string
}
// ServeHTTP inspects the URL path to locate a file within the static dir
// on the SPA handler. If a file is found, it will be served. If not, the
// file located at the index path on the SPA handler will be served. This
// is suitable behavior for serving an SPA (single page application).
func ( h spaHandler ) ServeHTTP ( w http. ResponseWriter , r * http. Request ) {
// get the absolute path to prevent directory traversal
path , err := filepath . Abs ( r . URL . Path )
if err != nil {
// if we failed to get the absolute path respond with a 400 bad request
// and stop
http . Error ( w , err . Error (), http . StatusBadRequest )
return
}
// prepend the path with the path to the static directory
path = filepath . Join ( h . staticPath , path )
// check whether a file exists at the given path
_ , err = os . Stat ( path )
if os . IsNotExist ( err ) {
// file does not exist, serve index.html
http . ServeFile ( w , r , filepath . Join ( h . staticPath , h . indexPath ))
return
} else if err != nil {
// if we got an error (that wasn't that the file doesn't exist) stating the
// file, return a 500 internal server error and stop
http . Error ( w , err . Error (), http . StatusInternalServerError )
return
}
// otherwise, use http.FileServer to serve the static dir
http . FileServer ( http . Dir ( h . staticPath )). ServeHTTP ( w , r )
}
func main () {
router := mux . NewRouter ()
router . HandleFunc ( "/api/health" , func ( w http. ResponseWriter , r * http. Request ) {
// an example API handler
json . NewEncoder ( w ). Encode ( map [ string ] bool { "ok" : true })
})
spa := spaHandler { staticPath : "build" , indexPath : "index.html" }
router . PathPrefix ( "/" ). Handler ( spa )
srv := & http. Server {
Handler : router ,
Addr : "127.0.0.1:8000" ,
// Good practice: enforce timeouts for servers you create!
WriteTimeout : 15 * time . Second ,
ReadTimeout : 15 * time . Second ,
}
log . Fatal ( srv . ListenAndServe ())
}
r := mux . NewRouter ()
r . HandleFunc ( "/articles/{category}/{id:[0-9]+}" , ArticleHandler ).
Name ( "article" )
url , err := r . Get ( "article" ). URL ( "category" , "technology" , "id" , "42" )
r := mux . NewRouter ()
r . Host ( "{subdomain}.example.com" ).
Path ( "/articles/{category}/{id:[0-9]+}" ).
Queries ( "filter" , "{filter}" ).
HandlerFunc ( ArticleHandler ).
Name ( "article" )
// url.String() will be "http://news.example.com/articles/technology/42?filter=gorilla"
url , err := r . Get ( "article" ). URL ( "subdomain" , "news" ,
"category" , "technology" ,
"id" , "42" ,
"filter" , "gorilla" )
r . HeadersRegexp ( "Content-Type" , "application/(text|json)" )
// "http://news.example.com/"
host , err := r . Get ( "article" ). URLHost ( "subdomain" , "news" )
// "/articles/technology/42"
path , err := r . Get ( "article" ). URLPath ( "category" , "technology" , "id" , "42" )
r := mux . NewRouter ()
s := r . Host ( "{subdomain}.example.com" ). Subrouter ()
s . Path ( "/articles/{category}/{id:[0-9]+}" ).
HandlerFunc ( ArticleHandler ).
Name ( "article" )
// "http://news.example.com/articles/technology/42"
url , err := r . Get ( "article" ). URL ( "subdomain" , "news" ,
"category" , "technology" ,
"id" , "42" )
package main
import (
"fmt"
"net/http"
"strings"
"github.com/gorilla/mux"
)
func handler ( w http. ResponseWriter , r * http. Request ) {
return
}
func main () {
r := mux . NewRouter ()
r . HandleFunc ( "/" , handler )
r . HandleFunc ( "/products" , handler ). Methods ( "POST" )
r . HandleFunc ( "/articles" , handler ). Methods ( "GET" )
r . HandleFunc ( "/articles/{id}" , handler ). Methods ( "GET" , "PUT" )
r . HandleFunc ( "/authors" , handler ). Queries ( "surname" , "{surname}" )
err := r . Walk ( func ( route * mux. Route , router * mux. Router , ancestors [] * mux. Route ) error {
pathTemplate , err := route . GetPathTemplate ()
if err == nil {
fmt . Println ( "ROUTE:" , pathTemplate )
}
pathRegexp , err := route . GetPathRegexp ()
if err == nil {
fmt . Println ( "Path regexp:" , pathRegexp )
}
queriesTemplates , err := route . GetQueriesTemplates ()
if err == nil {
fmt . Println ( "Queries templates:" , strings . Join ( queriesTemplates , "," ))
}
queriesRegexps , err := route . GetQueriesRegexp ()
if err == nil {
fmt . Println ( "Queries regexps:" , strings . Join ( queriesRegexps , "," ))
}
methods , err := route . GetMethods ()
if err == nil {
fmt . Println ( "Methods:" , strings . Join ( methods , "," ))
}
fmt . Println ()
return nil
})
if err != nil {
fmt . Println ( err )
}
http . Handle ( "/" , r )
}
package main
import (
"context"
"flag"
"log"
"net/http"
"os"
"os/signal"
"time"
"github.com/gorilla/mux"
)
func main () {
var wait time. Duration
flag . DurationVar ( & wait , "graceful-timeout" , time . Second * 15 , "the duration for which the server gracefully wait for existing connections to finish - e.g. 15s or 1m" )
flag . Parse ()
r := mux . NewRouter ()
// Add your routes as needed
srv := & http. Server {
Addr : "0.0.0.0:8080" ,
// Good practice to set timeouts to avoid Slowloris attacks.
WriteTimeout : time . Second * 15 ,
ReadTimeout : time . Second * 15 ,
IdleTimeout : time . Second * 60 ,
Handler : r , // Pass our instance of gorilla/mux in.
}
// Run our server in a goroutine so that it doesn't block.
go func () {
if err := srv . ListenAndServe (); err != nil {
log . Println ( err )
}
}()
c := make ( chan os. Signal , 1 )
// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C)
// SIGKILL, SIGQUIT or SIGTERM (Ctrl+/) will not be caught.
signal . Notify ( c , os . Interrupt )
// Block until we receive our signal.
<- c
// Create a deadline to wait for.
ctx , cancel := context . WithTimeout ( context . Background (), wait )
defer cancel ()
// Doesn't block if no connections, but will otherwise wait
// until the timeout deadline.
srv . Shutdown ( ctx )
// Optionally, you could run srv.Shutdown in a goroutine and block on
// <-ctx.Done() if your application should wait for other services
// to finalize based on context cancellation.
log . Println ( "shutting down" )
os . Exit ( 0 )
}
type MiddlewareFunc func (http. Handler ) http. Handler
func loggingMiddleware ( next http. Handler ) http. Handler {
return http . HandlerFunc ( func ( w http. ResponseWriter , r * http. Request ) {
// Do stuff here
log . Println ( r . RequestURI )
// Call the next handler, which can be another middleware in the chain, or the final handler.
next . ServeHTTP ( w , r )
})
}
r := mux . NewRouter ()
r . HandleFunc ( "/" , handler )
r . Use ( loggingMiddleware )
// Define our struct
type authenticationMiddleware struct {
tokenUsers map [ string ] string
}
// Initialize it somewhere
func ( amw * authenticationMiddleware ) Populate () {
amw . tokenUsers [ "00000000" ] = "user0"
amw . tokenUsers [ "aaaaaaaa" ] = "userA"
amw . tokenUsers [ "05f717e5" ] = "randomUser"
amw . tokenUsers [ "deadbeef" ] = "user0"
}
// Middleware function, which will be called for each request
func ( amw * authenticationMiddleware ) Middleware ( next http. Handler ) http. Handler {
return http . HandlerFunc ( func ( w http. ResponseWriter , r * http. Request ) {
token := r . Header . Get ( "X-Session-Token" )
if user , found := amw . tokenUsers [ token ]; found {
// We found the token in our map
log . Printf ( "Authenticated user %s \n " , user )
// Pass down the request to the next middleware (or final handler)
next . ServeHTTP ( w , r )
} else {
// Write an error and stop the handler chain
http . Error ( w , "Forbidden" , http . StatusForbidden )
}
})
}
r := mux . NewRouter ()
r . HandleFunc ( "/" , handler )
amw := authenticationMiddleware {}
amw . Populate ()
r . Use ( amw . Middleware )
package main
import (
"net/http"
"github.com/gorilla/mux"
)
func main () {
r := mux . NewRouter ()
// IMPORTANT: you must specify an OPTIONS method matcher for the middleware to set CORS headers
r . HandleFunc ( "/foo" , fooHandler ). Methods ( http . MethodGet , http . MethodPut , http . MethodPatch , http . MethodOptions )
r . Use ( mux . CORSMethodMiddleware ( r ))
http . ListenAndServe ( ":8080" , r )
}
func fooHandler ( w http. ResponseWriter , r * http. Request ) {
w . Header (). Set ( "Access-Control-Allow-Origin" , "*" )
if r . Method == http . MethodOptions {
return
}
w . Write ([] byte ( "foo" ))
}
* Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 ( # 0)
> GET /foo HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.59.0
> Accept: * / *
>
< HTTP/1.1 200 OK
< Access-Control-Allow-Methods: GET,PUT,PATCH,OPTIONS
< Access-Control-Allow-Origin: *
< Date: Fri, 28 Jun 2019 20:13:30 GMT
< Content-Length: 3
< Content-Type: text/plain ; charset=utf-8
<
* Connection # 0 to host localhost left intact
foo
// endpoints.go
package main
func HealthCheckHandler ( w http. ResponseWriter , r * http. Request ) {
// A very simple health check.
w . Header (). Set ( "Content-Type" , "application/json" )
w . WriteHeader ( http . StatusOK )
// In the future we could report back on the status of our DB, or our cache
// (e.g. Redis) by performing a simple PING, and include them in the response.
io . WriteString ( w , `{"alive": true}` )
}
func main () {
r := mux . NewRouter ()
r . HandleFunc ( "/health" , HealthCheckHandler )
log . Fatal ( http . ListenAndServe ( "localhost:8080" , r ))
}
// endpoints_test.go
package main
import (
"net/http"
"net/http/httptest"
"testing"
)
func TestHealthCheckHandler ( t * testing. T ) {
// Create a request to pass to our handler. We don't have any query parameters for now, so we'll
// pass 'nil' as the third parameter.
req , err := http . NewRequest ( "GET" , "/health" , nil )
if err != nil {
t . Fatal ( err )
}
// We create a ResponseRecorder (which satisfies http.ResponseWriter) to record the response.
rr := httptest . NewRecorder ()
handler := http . HandlerFunc ( HealthCheckHandler )
// Our handlers satisfy http.Handler, so we can call their ServeHTTP method
// directly and pass in our Request and ResponseRecorder.
handler . ServeHTTP ( rr , req )
// Check the status code is what we expect.
if status := rr . Code ; status != http . StatusOK {
t . Errorf ( "handler returned wrong status code: got %v want %v" ,
status , http . StatusOK )
}
// Check the response body is what we expect.
expected := `{"alive": true}`
if rr . Body . String () != expected {
t . Errorf ( "handler returned unexpected body: got %v want %v" ,
rr . Body . String (), expected )
}
}
// endpoints.go
func main () {
r := mux . NewRouter ()
// A route with a route variable:
r . HandleFunc ( "/metrics/{type}" , MetricsHandler )
log . Fatal ( http . ListenAndServe ( "localhost:8080" , r ))
}
// endpoints_test.go
func TestMetricsHandler ( t * testing. T ) {
tt := [] struct {
routeVariable string
shouldPass bool
}{
{ "goroutines" , true },
{ "heap" , true },
{ "counters" , true },
{ "queries" , true },
{ "adhadaeqm3k" , false },
}
for _ , tc := range tt {
path := fmt . Sprintf ( "/metrics/%s" , tc . routeVariable )
req , err := http . NewRequest ( "GET" , path , nil )
if err != nil {
t . Fatal ( err )
}
rr := httptest . NewRecorder ()
// Need to create a router that we can pass the request through so that the vars will be added to the context
router := mux . NewRouter ()
router . HandleFunc ( "/metrics/{type}" , MetricsHandler )
router . ServeHTTP ( rr , req )
// In this case, our MetricsHandler returns a non-200 response
// for a route variable it doesn't know about.
if rr . Code == http . StatusOK && ! tc . shouldPass {
t . Errorf ( "handler should have failed on routeVariable %s: got %v want %v" ,
tc . routeVariable , rr . Code , http . StatusOK )
}
}
}
package main
import (
"net/http"
"log"
"github.com/gorilla/mux"
)
func YourHandler ( w http. ResponseWriter , r * http. Request ) {
w . Write ([] byte ( "Gorilla! \n " ))
}
func main () {
r := mux . NewRouter ()
// Routes consist of a path and a handler function.
r . HandleFunc ( "/" , YourHandler )
// Bind to a port and pass our router in
log . Fatal ( http . ListenAndServe ( ":8000" , r ))
}
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About
Package gorilla/mux implements a request router and dispatcher for matching incoming requests to
their respective handler.
The name mux stands for "HTTP request multiplexer". Like the standard http.ServeMux , mux.Router matches incoming requests against a list of registered routes and calls a handler for the route that matches the URL or other conditions. The main features are:
With a correctly configured Go toolchain:
Let's start registering a couple of URL paths and handlers:
Here we register three routes mapping URL paths to handlers. This is equivalent to how http.HandleFunc() works: if an incoming request URL matches one of the paths, the corresponding handler is called passing ( http.ResponseWriter , *http.Request ) as parameters.
Paths can have variables. They are defined using the format {name} or {name:pattern} . If a regular expression pattern is not defined, the matched variable will be anything until the next slash. For example:
The names are used to create a map of route variables which can be retrieved calling mux.Vars() :
And this is all you need to know about the basic usage. More advanced options are explained below.
Routes can also be restricted to a domain or subdomain. Just define a host pattern to be matched. They can also have variables:
There are several other matchers that can be added. To match path prefixes:
...or to use a custom matcher function:
...and finally, it is possible to combine several matchers in a single route:
Routes are tested in the order they were added to the router. If two routes match, the first one wins:
Setting the same matching conditions again and again can be boring, so we have a way to group several routes that share the same requirements. We call it "subrouting".
For example, let's say we have several URLs that should only match when the host is www.example.com . Create a route for that host and get a "subrouter" from it:
Then register routes in the subrouter:
The three URL paths we registered above will only be tested if the domain is www.example.com , because the subrouter is tested first. This is not only convenient, but also optimizes request matching. You can create subrouters combining any attribute matchers accepted by a route.
Subrouters can be used to create domain or path "namespaces": you define subrouters in a central place and then parts of the app can register its paths relatively to a given subrouter.
There's one more thing about subroutes. When a subrouter has a path prefix, the inner routes use it as base for their paths:
Note that the path provided to PathPrefix() represents a "wildcard": calling
PathPrefix("/static/").Handler(...) means that the handler will be passed any
request that matches "/static/*". This makes it easy to serve static files with mux:
Most of the time it makes sense to serve your SPA on a separate web server from your API,
but sometimes it's desirable to serve them both from one place. It's possible to write a simple
handler for serving your SPA (for use with React Router's BrowserRouter for example), and leverage
mux's powerful routing for your API endpoints.
Now let's see how to build registered URLs.
Routes can be named. All routes that define a name can have their URLs built, or "reversed". We define a name calling Name() on a route. For example:
To build a URL, get the route and call the URL() method, passing a sequence of key/value pairs for the route variables. For the previous route, we would do:
...and the result will be a url.URL with the following path:
This also works for host and query value variables:
All variables defined in the route are required, and their values must conform to the corresponding patterns. These requirements guarantee that a generated URL will always match a registered route -- the only exception is for explicitly defined "build-only" routes which never match.
Regex support also exists for matching Headers within a route. For example, we could do:
...and the route will match both requests with a Content-Type of application/json as well as application/text
There's also a way to build only the URL host or path for a route: use the methods URLHost() or URLPath() instead. For the previous route, we would do:
And if you use subrouters, host and path defined separately can be built as well:
The Walk function on mux.Router can be used to visit all of the routes that are registered on a router. For example,
the following prints all of the registered routes:
Go 1.8 introduced the ability to gracefully shutdown a *http.Server . Here's how to do that alongside mux :
Mux supports the addition of middlewares to a Router , which are executed in the order they are added if a match is found, including its subrouters.
Middlewares are (typically) small pieces of code which take one request, do something with it, and pass it down to another middleware or the final handler. Some common use cases for middleware are request logging, header manipulation, or ResponseWriter hijacking.
Mux middlewares are defined using the de facto standard type:
Typically, the returned handler is a closure which does something with the http.ResponseWriter and http.Request passed to it, and then calls the handler passed as parameter to the MiddlewareFunc. This takes advantage of closures being able access variables from the context where they are created, while retaining the signature enforced by the receivers.
A very basic middleware which logs the URI of the request being handled could be written as:
Middlewares can be added to a router using Router.Use() :
A more complex authentication middleware, which maps session token to users, could be written as:
Note: The handler chain will be stopped if your middleware doesn't call next.ServeHTTP() with the corresponding parameters. This can be used to abort a request if the middleware writer wants to. Middlewares should write to ResponseWriter if they are going to terminate the request, and they should not write to ResponseWriter if they are not going to terminate it.
CORSMethodMiddleware intends to make it easier to strictly set the Access-Control-Allow-Methods response header.
Important : there must be an OPTIONS method matcher for the middleware to set the headers.
Here is an example of using CORSMethodMiddleware along with a custom OPTIONS handler to set all the required CORS headers:
And an request to /foo using something like:
Testing handlers in a Go web application is straightforward, and mux doesn't complicate this any further. Given two files: endpoints.go and endpoints_test.go , here's how we'd test an application using mux .
In the case that our routes have variables , we can pass those in the request. We could write
table-driven tests to test multiple
possible route variables as needed.
Our test file, with a table-driven test of routeVariables :
Here's a complete, runnable example of a small mux based server:
BSD licensed. See the LICENSE file for details.
A powerful HTTP router and URL matcher for building Go web servers with 🦍
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