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httpserver.go
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/
httpserver.go
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package main
import (
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"time"
"github.com/go-chi/chi/v5/middleware"
"github.com/go-chi/chi/v5"
)
type Backend struct {
Ip string
Port string
}
type Ingress struct {
Path string
Host string
Backends []Backend
LastUsedBackendIndex uint
}
type HttpServer struct {
r *chi.Mux
}
func NewHttpServer() *HttpServer {
r := chi.NewRouter()
r.Use(middleware.Logger)
r.Use(middleware.RequestID)
r.Use(middleware.RealIP)
r.Use(middleware.Recoverer)
r.Use(middleware.Timeout(60 * time.Second))
return &HttpServer{
r: r,
}
}
func (h *HttpServer) StartServer() {
http.ListenAndServe(":80", h.r)
}
func (h *HttpServer) RegisterIngress(i Ingress) {
h.r.Get(i.Path, func(rw http.ResponseWriter, r *http.Request) {
backend := i.Backends[i.LastUsedBackendIndex%uint(len(i.Backends))]
remoteURL := fmt.Sprintf("http://%s:%s", backend.Ip, backend.Port)
remote, err := url.Parse(remoteURL)
if err != nil {
fmt.Printf("cannot parse url: %s err is: %v", remoteURL, err)
return
}
proxy := httputil.NewSingleHostReverseProxy(remote)
proxy.Transport = &http.Transport{
ResponseHeaderTimeout: 5 * time.Second,
}
r.Header.Add("proxy", "erip-proxy")
r.Host = i.Host
proxy.ServeHTTP(rw, r)
i.LastUsedBackendIndex += 1
})
backendsStr := ""
for _, backend := range i.Backends {
backendsStr += fmt.Sprintf("%s:%s, ", backend.Ip, backend.Port)
}
fmt.Printf("Proxy requests to '%s' -> %s\n", i.Path, backendsStr)
}