github.com/avenga/couper@v1.12.2/server/http_proxy_test.go (about)

     1  package server_test
     2  
     3  import (
     4  	"bytes"
     5  	"crypto/rand"
     6  	"io"
     7  	"net/http"
     8  	"testing"
     9  	"time"
    10  
    11  	"github.com/avenga/couper/internal/test"
    12  )
    13  
    14  func TestHTTPProxy_Stream(t *testing.T) {
    15  	helper := test.New(t)
    16  
    17  	shutdown, hook := newCouper("testdata/integration/proxy/01_couper.hcl", helper)
    18  	defer shutdown()
    19  
    20  	randomBytes := make([]byte, 64*1024) // doubled amount of the proxy byte buffer (32k)
    21  	_, err := rand.Read(randomBytes)
    22  	helper.Must(err)
    23  
    24  	outreq, err := http.NewRequest(http.MethodPost, "http://stream.me:8080/", bytes.NewBuffer(randomBytes))
    25  	helper.Must(err)
    26  
    27  	client := newClient()
    28  	time.Sleep(time.Second)
    29  	for _, e := range hook.AllEntries() {
    30  		t.Log(e.String())
    31  	}
    32  
    33  	res, err := client.Do(outreq)
    34  	helper.Must(err)
    35  
    36  	if res.StatusCode != http.StatusOK {
    37  		t.Errorf("expected status OK, got %d", res.StatusCode)
    38  	}
    39  
    40  	lastRead := time.Now()
    41  	lastReadAv := time.Duration(0)
    42  	totalBytes := 0
    43  	readCount := 0
    44  	for {
    45  		lrd := time.Since(lastRead)
    46  		lastReadAv += lrd
    47  		bf := make([]byte, 1024)
    48  		n, rerr := res.Body.Read(bf)
    49  		totalBytes += n
    50  		if rerr == io.EOF {
    51  			break
    52  		}
    53  
    54  		lastRead = time.Now()
    55  		readCount += 1
    56  	}
    57  	helper.Must(res.Body.Close())
    58  
    59  	if totalBytes != 65536 {
    60  		t.Errorf("expected 64k bytes, got: %d", totalBytes)
    61  	}
    62  
    63  	// lastReadAv is within nanosecond range (<100ns),
    64  	// should be greater than 0.3 millisecond range while streaming since the backend delays the response chunks.
    65  	if lastReadAv/time.Duration(readCount) < time.Nanosecond*300 {
    66  		t.Errorf("expected slower read times with delayed streaming, got an average of: %s", lastReadAv/time.Duration(readCount))
    67  	}
    68  	t.Log(lastReadAv / time.Duration(readCount))
    69  }