Golang : Build new URL for named or registered route with Gorilla webtoolkit example

Problem :

Ok, you want to construct a new URL with Gorilla webtoolkit but don't know how. For example, you have a named / registered route HandleFunc() defined and you want to build a URL based on the named route.

Solution :

Use the Get() method to retrieve the route base on the route name. Supply the URL() method with parameters. 1 key to 1 value.

 package main

 import (
 "fmt"
 "github.com/gorilla/mux"
 "net/http"
 )

 func SayHelloWorld(w http.ResponseWriter, r *http.Request) {
 w.Write([]byte("Hello, World!"))
 }

 func ProcessPathVariables(w http.ResponseWriter, r *http.Request) {

 // break down the variables for easier assignment
 vars := mux.Vars(r)
 name := vars["name"]
 job := vars["job"]
 age := vars["age"]
 w.Write([]byte(fmt.Sprintf("Name is %s \n", name)))
 w.Write([]byte(fmt.Sprintf("Job is %s \n", job)))
 w.Write([]byte(fmt.Sprintf("Age is %s \n", age)))

 route := mux.CurrentRoute(r)
 w.Write([]byte(fmt.Sprintf("Route name is %v \n", route.GetName())))

 }

 func main() {
 mx := mux.NewRouter()

 mx.HandleFunc("/", SayHelloWorld).Name("home")

 // this route name is person
 mx.HandleFunc("/person/{name}/{job}/{age:[0-99]+}", ProcessPathVariables).Name("person")

 // get the person route and build a new URL with 1 key to 1 value parameters.
 url, err := mx.Get("person").
 URL("name", "Boo",
 "job", "CEO", 
 "age", "37")

 if err != nil {
 fmt.Println(err)
 }

 builtURL := url.String()
 fmt.Printf("URL : %v \n", builtURL)

 http.ListenAndServe(":8080", mx)
 }

Output :