package util

import (
	"net"
	"net/http"
	"sync"
	"time"
)

var (
	httpSession     *http.Client
	httpSessionOnce sync.Once
	baseTransport   = &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: (&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
		}).DialContext,
		ForceAttemptHTTP2:     true,
		MaxIdleConns:          100,
		IdleConnTimeout:       90 * time.Second,
		TLSHandshakeTimeout:   5 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,
		MaxIdleConnsPerHost:   100,
		MaxConnsPerHost:       100,
		ResponseHeaderTimeout: 10 * time.Second,
		DisableCompression:    false,
	}
)

func GetHTTPSession() *http.Client {
	httpSessionOnce.Do(func() {
		httpSession = &http.Client{
			Transport: baseTransport,
			Timeout:   60 * time.Second,
		}
	})
	return httpSession
}