Handle sub domains in go.

[Swati Sharma]

Hello
I am working on a project where I need to setup the multiple sub-domains with the routes. For routing I am using gin package.  I tried code with two sub-domains, but in my case it would be 100 sub-domains. I tried the following code for this:

package main

import (
    "github.com/gin-gonic/gin"
    "net/http"
    "strings"
)

type Subdomains map[string]http.Handler

func (subdomains Subdomains) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    domainParts := strings.Split(r.Host, ".")

    if mux := subdomains[domainParts[0]]; mux != nil {
        mux.ServeHTTP(w, r)
    } else {
        http.Error(w, "Not found", 404)
    }
}

func main() {
    r := gin.Default()
    r2 := gin.Default()
    hs := make(Subdomains)
    hs["admin"] = r
    hs["analytics"] = r2
    r.GET("/ping", adminHandlerOne)
    r2.GET("/ping", adminHandlerOne)
    http.ListenAndServe(":9090", hs)
}
func adminHandlerOne(c *gin.Context) {
    c.JSON(200, gin.H{
        "message": "pong",
    })
}

But I think that this is not good. Is anybody know the proper way to do this?
I tried to do this with loop also, but it did't work for me.

[Jonathan Yu]

I don't use gin (I use chi) but from the docs it seems gin is based on httprouter, and thus maybe this pattern/example is useful? https://github.com/julienschmidt/httprouter#multi-domain--sub-domains (looks very similar to yours, though - only difference is that this example uses the fully-qualified hostname instead of just the first part)

Chi provides a middleware for doing this: https://github.com/go-chi/hostrouter - the source code might help you with what you're doing? https://github.com/go-chi/hostrouter/blob/master/hostrouter.go

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