go-router-simple is a simple HTTP request router for Go. This package is ported from Router::Simple which is a great module in Perl.
Motivation: Most request routing third-party modules in Go are implemented using the trie (radix) tree algorithm. Hence, they are fast but it hard to provide flexible URL parameters. (e.g. URL paths containing /)
package main
import (
"fmt"
"log"
"net/http"
"strings"
"github.com/Code-Hex/go-router-simple"
)
func main() {
r := router.New()
r.GET("/", http.HandlerFunc(Index))
r.GET("/hi/:name", http.HandlerFunc(Hi))
r.GET("/hi/{name}", http.HandlerFunc(Hi))
r.GET("/download/*.*", http.HandlerFunc(GetFilename))
r.GET(`/blog/{year:\d{4}}/{month:(?:\d{2})}`, Blog())
log.Fatal(http.ListenAndServe(":8080", r))
}
func Index(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "Index!\n")
}
func Hi(w http.ResponseWriter, r *http.Request) {
name := router.ParamFromContext(r.Context(), "name")
fmt.Fprintf(w, "Welcome! %q\n", name)
}
func GetFilename(w http.ResponseWriter, r *http.Request) {
wildcards := router.WildcardsFromContext(r.Context())
fmt.Fprintf(w, "File: %q\n", strings.Join(wildcards, "."))
}
func Blog() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
year := router.ParamFromContext(r.Context(), "year")
month := router.ParamFromContext(r.Context(), "month")
fmt.Fprintf(w, "Render: %q\n", year+"/"+month)
})
}go-router-simple is used regular expressions for traversal but it's a little slow. So you would better to use other third-party routing packages for traversing most request paths whenever possible.
Here's example. Basically, use httprouter, but use go-router-simple for complex URL parameters.
package main
import (
"fmt"
"log"
"net/http"
"github.com/Code-Hex/go-router-simple"
"github.com/julienschmidt/httprouter"
)
func main() {
// Setup go-router-simple.
r := router.New()
r.GET(`/blog/{year:(?:199\d|20\d{2})}/{month:(?:0?[1-9]|1[0-2])}`, Blog())
// Setup httprouter.
hr := httprouter.New()
hr.GET("/hi/:name", func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
name := ps.ByName("name")
fmt.Fprintf(w, "Welcome! %q\n", name)
})
hr.GET("/bye/:name", func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
name := ps.ByName("name")
fmt.Fprintf(w, "Bye! %q\n", name)
})
// If not found on httprouter, it will traverse on go-router-simple.
hr.NotFound = r
log.Fatal(http.ListenAndServe(":8080", hr))
}
func Blog() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
year := router.ParamFromContext(r.Context(), "year")
month := router.ParamFromContext(r.Context(), "month")
fmt.Fprintf(w, "Render: %q\n", year+"/"+month)
})
}Result
$ curl localhost:8080/hi/codehex
Welcome! "codehex"
$ curl localhost:8080/bye/codehex
Bye! "codehex"
$ curl localhost:8080/blog/2020/11
Render: "2020/11"
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