103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
package main
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import (
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"crypto/tls"
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"flag"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"time"
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)
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// MeasureTTFB measures the Time to First Byte for the given URL.
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func MeasureTTFB(url string, cookie string, verbose bool) (int64, error) {
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// Create a custom HTTP transport to allow measuring the TTFB.
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transport := &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
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}
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client := &http.Client{
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Transport: transport,
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}
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// Create a new request.
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return 0, err
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}
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// If a cookie is provided, set it in the request header.
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if cookie != "" {
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req.Header.Set("Cookie", cookie)
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if verbose {
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fmt.Println("Using cookie:", cookie)
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}
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}
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if verbose {
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fmt.Println("Sending request to:", url)
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}
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// Record the start time.
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start := time.Now()
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// Perform the request.
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resp, err := client.Do(req)
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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// Measure the time taken to receive the first byte.
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ttfb := time.Since(start).Milliseconds()
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if verbose {
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fmt.Println("Received response status:", resp.Status)
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}
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return ttfb, nil
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}
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func main() {
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// Define and parse command-line flags.
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verbose := flag.Bool("v", false, "Enable verbose output")
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cookieFile := flag.String("c", "", "Path to file containing the authentication cookie")
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flag.Parse()
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// Check if the URL is provided as an argument.
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if flag.NArg() != 1 {
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fmt.Println("Usage: go run main.go [-v] [-c cookieFile] <URL>")
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os.Exit(1)
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}
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url := flag.Arg(0)
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// Read the cookie from the specified file if provided.
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var cookie string
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if *cookieFile != "" {
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data, err := ioutil.ReadFile(*cookieFile)
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if err != nil {
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fmt.Printf("Error reading cookie file: %v\n", err)
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os.Exit(1)
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}
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cookie = strings.TrimSpace(string(data))
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}
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// Measure the TTFB.
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ttfb, err := MeasureTTFB(url, cookie, *verbose)
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if err != nil {
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fmt.Printf("Error measuring TTFB: %v\n", err)
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os.Exit(1)
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}
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// Only print the TTFB in milliseconds by default.
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if *verbose {
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fmt.Printf("Time to First Byte for %s: %d ms\n", url, ttfb)
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} else {
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fmt.Printf("%d\n", ttfb)
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}
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}
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