rest v2.10.0 lab

resty_test.go

package resty_test

import (
	"context"
	"crypto/tls"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/go-resty/resty/v2"
	"golang.org/x/net/http2"
	"golang.org/x/sync/semaphore"
)

const (
	requestCount int = 1000
)

type Payload struct {
	Status int `json:"status"`
}

func TestConcurrentBuffer(t *testing.T) {
	var err error

	// create a response handler
	mux := http.NewServeMux()
	mux.HandleFunc("/test", func(w http.ResponseWriter, r *http.Request) {
		b, err := io.ReadAll(r.Body)
		if err != nil {
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "error reading request body: %+v", err)
			return
		}

		var payload Payload
		if err := json.Unmarshal(b, &payload); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprintf(w, "error unmarshaling request body: %+v, body: %s", err, string(b))
			return
		}

		w.WriteHeader(payload.Status)
	})

	// spin up a test server
	srv := httptest.NewServer(mux)
	defer srv.Close()
	srv.Config.SetKeepAlivesEnabled(true)

	// configure our http client as our production system
	// Create a transport
	transport := http.DefaultTransport.(*http.Transport).Clone()
	transport.DisableKeepAlives = true
	transport.MaxIdleConns = 0

	// Get a copy of the HTTP2 transport
	http2Transport, err := http2.ConfigureTransports(transport)
	if err == nil {
		// enable healthchecks by setting the idle timeout
		http2Transport.ReadIdleTimeout = time.Second * 5 // ping is performed at N whenever no frame was received in the meantime
		// change from the default of 15s
		http2Transport.PingTimeout = time.Second * 10 // after what time a ping is considered timed out
	}

	httpClient := http.Client{
		Transport: transport,
	}

	// build up a resty client
	client := resty.NewWithClient(&httpClient)
	client.SetBaseURL(srv.URL)
	client.SetRetryCount(3)
	client.SetRetryWaitTime(5 * time.Millisecond)
	client.SetRetryMaxWaitTime(25 * time.Millisecond)
	client.SetTimeout(5 * time.Second)
	client.Header.Add("Accept", "application/json")
	client.SetTLSClientConfig(&tls.Config{InsecureSkipVerify: true})

	client.AddRetryCondition(func(r *resty.Response, err error) bool {
		// retry for 500, so always we want to provoke retries
		return err != nil || r.StatusCode() > 499
	})

	// spawn 1000 concurrent requests
	sem := semaphore.NewWeighted(100)
	for i := 0; i < requestCount; i++ {
		err = sem.Acquire(context.Background(), 1)
		if err != nil {
			t.Errorf("could not acquire semaphore: %v", err)
			return
		}
		go func() {
			defer sem.Release(1)

			payload := Payload{
				Status: http.StatusInternalServerError,
			}
			res, err := client.NewRequest().SetBody(payload).Post("/test")
			if err != nil {
				t.Errorf("unexpected error: %v", err)
			}

			if res.StatusCode() != http.StatusInternalServerError {
				t.Errorf("unexpected status code %d, expected %d", res.StatusCode(), http.StatusInternalServerError)
			}

			if string(res.Body()) != "" {
				t.Errorf("unexpected body %s, expected empty", string(res.Body()))
			}

			// now successful requests
			payload2 := Payload{
				Status: http.StatusOK,
			}
			res, err = client.NewRequest().SetBody(payload2).Post("/test")
			if err != nil {
				t.Errorf("unexpected error: %v", err)
			}

			if res.StatusCode() != http.StatusOK {
				t.Errorf("unexpected status code %d, expected %d", res.StatusCode(), http.StatusOK)
			}

			if string(res.Body()) != "" {
				t.Errorf("unexpected body %s, expected empty", string(res.Body()))
			}
		}()
	}

	err = sem.Acquire(context.Background(), 100)
	if err != nil {
		t.Errorf("could not wait for all semaphores to finish: %v", err)
	}
}