/
rehttp_server_test.go
532 lines (448 loc) · 15 KB
/
rehttp_server_test.go
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package rehttp
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httptest"
"net/url"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/aybabtme/iocontrol"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"golang.org/x/net/context"
"golang.org/x/net/context/ctxhttp"
)
func assertNetTimeoutErr(t *testing.T, err error) {
if assert.NotNil(t, err) {
nerr, ok := err.(net.Error)
require.True(t, ok)
assert.True(t, nerr.Timeout())
t.Logf("%#v", err)
}
}
func assertURLTimeoutErr(t *testing.T, err error) {
if assert.NotNil(t, err) {
t.Logf("%T %[1]v", err)
uerr, ok := err.(*url.Error)
require.True(t, ok)
t.Logf("%T %[1]v", uerr.Err)
nerr, ok := uerr.Err.(net.Error)
if ok {
require.True(t, ok)
assert.True(t, nerr.Timeout())
} else {
// sometimes this error is set to an unexported net/http error that is a
// simple error string, not implemented net.Error.
require.Contains(t, uerr.Err.Error(), "net/http: request canceled")
}
t.Logf("%#v", nerr)
}
}
func TestContextCancelOnRetry(t *testing.T) {
callCnt := int32(0)
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
cnt := atomic.AddInt32(&callCnt, 1)
switch cnt {
case 1:
w.WriteHeader(500)
default:
time.Sleep(2 * time.Second)
fmt.Fprint(w, r.URL.Path)
}
}))
defer srv.Close()
// cancel while waiting on retry response
tr := NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatusInterval(500, 600)), ConstDelay(0))
c := &http.Client{
Transport: tr,
}
ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(time.Second))
defer cancelFn()
res, err := ctxhttp.Get(ctx, c, srv.URL+"/test")
require.Nil(t, res)
assert.Equal(t, context.DeadlineExceeded, err)
assert.Equal(t, int32(2), atomic.LoadInt32(&callCnt))
// cancel while waiting on delay
atomic.StoreInt32(&callCnt, 0)
tr = NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatusInterval(500, 600)), ConstDelay(2*time.Second))
c = &http.Client{
Transport: tr,
}
ctx, cancelFn = context.WithDeadline(context.Background(), time.Now().Add(time.Second))
defer cancelFn()
res, err = ctxhttp.Get(ctx, c, srv.URL+"/test")
require.Nil(t, res)
assert.Equal(t, context.DeadlineExceeded, err)
assert.Equal(t, int32(1), atomic.LoadInt32(&callCnt))
}
func TestContextCancel(t *testing.T) {
// server that doesn't reply before the timeout
wg := sync.WaitGroup{}
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
time.Sleep(2 * time.Second)
fmt.Fprint(w, r.URL.Path)
wg.Done()
}))
defer srv.Close()
tr := NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatusInterval(500, 600)), ConstDelay(0))
c := &http.Client{
Transport: tr,
}
ctx, cancelFn := context.WithDeadline(context.Background(), time.Now().Add(time.Second))
defer cancelFn()
wg.Add(1)
res, err := ctxhttp.Get(ctx, c, srv.URL+"/test")
require.Nil(t, res)
assert.Equal(t, context.DeadlineExceeded, err)
wg.Wait()
}
func TestClientTimeoutSlowBody(t *testing.T) {
// server that flushes the headers ASAP, but sends the body slowly
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
tw := iocontrol.ThrottledWriter(w, 2, time.Second)
fmt.Fprint(tw, r.URL.Path)
}))
defer srv.Close()
runWithClient := func(c *http.Client) {
res, err := c.Get(srv.URL + "/testing")
// should receive a response
require.Nil(t, err)
require.NotNil(t, res)
// should fail with timeout while reading body
_, err = io.Copy(ioutil.Discard, res.Body)
res.Body.Close()
assertNetTimeoutErr(t, err)
}
// test with retry transport
tr := NewTransport(nil, RetryAll(RetryMaxRetries(2), RetryTemporaryErr()), ConstDelay(time.Second))
c := &http.Client{
Transport: tr,
Timeout: time.Second,
}
runWithClient(c)
// test with default transport, make sure it behaves the same way
c = &http.Client{Timeout: time.Second}
runWithClient(c)
}
func TestClientTimeoutOnRetry(t *testing.T) {
// server returns 500 on first call, sleeps 2s before reply on other calls
callCnt := int32(0)
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
cnt := atomic.AddInt32(&callCnt, 1)
switch cnt {
case 1:
w.WriteHeader(500)
default:
time.Sleep(2 * time.Second)
fmt.Fprint(w, r.URL.Path)
}
}))
defer srv.Close()
// timeout while waiting for retry request
tr := NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatusInterval(500, 600)), ConstDelay(0))
c := &http.Client{
Transport: tr,
Timeout: time.Second,
}
res, err := c.Get(srv.URL + "/test")
require.Nil(t, res)
assertURLTimeoutErr(t, err)
assert.Equal(t, int32(2), atomic.LoadInt32(&callCnt))
atomic.StoreInt32(&callCnt, 0)
// timeout while waiting for retry delay
tr = NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatusInterval(500, 600)), ConstDelay(2*time.Second))
c = &http.Client{
Transport: tr,
Timeout: time.Second,
}
res, err = c.Get(srv.URL + "/test")
require.Nil(t, res)
assertURLTimeoutErr(t, err)
assert.Equal(t, int32(1), atomic.LoadInt32(&callCnt))
}
func TestClientTimeout(t *testing.T) {
// server that doesn't reply before the timeout
wg := sync.WaitGroup{}
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
time.Sleep(2 * time.Second)
fmt.Fprint(w, r.URL.Path)
wg.Done()
}))
defer srv.Close()
// test with retry transport
tr := NewTransport(nil, RetryAll(RetryMaxRetries(2), RetryTemporaryErr()), ConstDelay(time.Second))
c := &http.Client{
Transport: tr,
Timeout: time.Second,
}
wg.Add(1)
res, err := c.Get(srv.URL + "/test")
require.Nil(t, res)
assertURLTimeoutErr(t, err)
// test with default transport, make sure it returns the same error
c = &http.Client{Timeout: time.Second}
wg.Add(1)
res, err = c.Get(srv.URL + "/test")
require.Nil(t, res)
assertURLTimeoutErr(t, err)
wg.Wait()
}
func TestTransportTimeout(t *testing.T) {
// server that doesn't reply before the timeout
wg := sync.WaitGroup{}
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
time.Sleep(2 * time.Second)
fmt.Fprint(w, r.URL.Path)
wg.Done()
}))
defer srv.Close()
// test with retry transport
httpTr := &http.Transport{
ResponseHeaderTimeout: time.Second,
}
tr := NewTransport(httpTr, RetryAll(RetryMaxRetries(1), RetryTemporaryErr()), ConstDelay(time.Second))
c := &http.Client{Transport: tr}
// ResponseHeaderTimeout causes a TemporaryErr, so it will retry once
wg.Add(2)
res, err := c.Get(srv.URL + "/test")
require.Nil(t, res)
assertURLTimeoutErr(t, err)
// test with HTTP transport, make sure it returns the same error
c = &http.Client{Transport: httpTr}
wg.Add(1)
res, err = c.Get(srv.URL + "/test")
require.Nil(t, res)
assertURLTimeoutErr(t, err)
wg.Wait()
}
func TestClientNoRetry(t *testing.T) {
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, r.URL.Path)
}))
defer srv.Close()
tr := NewTransport(nil, RetryAll(RetryMaxRetries(2), RetryTemporaryErr()), ConstDelay(time.Second))
c := &http.Client{
Transport: tr,
}
res, err := c.Get(srv.URL + "/test")
require.Nil(t, err)
defer res.Body.Close()
assert.Equal(t, 200, res.StatusCode)
var buf bytes.Buffer
_, err = io.Copy(&buf, res.Body)
require.Nil(t, err)
assert.Equal(t, "/test", buf.String())
}
func TestClientRetryWithBody(t *testing.T) {
fail := true
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if fail {
w.WriteHeader(500)
fail = false
return
}
_, _ = io.Copy(w, r.Body)
}))
defer srv.Close()
tr := NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatuses(500)), ConstDelay(0))
c := &http.Client{
Transport: tr,
}
res, err := c.Post(srv.URL+"/test", "", strings.NewReader("body"))
require.Nil(t, err)
defer res.Body.Close()
assert.Equal(t, 200, res.StatusCode)
var buf bytes.Buffer
_, err = io.Copy(&buf, res.Body)
require.Nil(t, err)
assert.Equal(t, "body", buf.String())
assert.False(t, fail)
}
func TestClientRetryWithHeaders(t *testing.T) {
fail := true
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if fail {
w.WriteHeader(500)
fail = false
return
}
for k, v := range r.Header {
w.Header()[k] = v
}
w.WriteHeader(200)
}))
defer srv.Close()
tr := NewTransport(nil, RetryAll(RetryMaxRetries(1), RetryStatuses(500)), ConstDelay(0))
c := &http.Client{
Transport: tr,
}
req, err := http.NewRequest("GET", srv.URL+"/test", nil)
require.NoError(t, err)
req.Header.Set("X-1", "a")
req.Header.Set("X-2", "b")
res, err := c.Do(req)
require.Nil(t, err)
defer res.Body.Close()
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, "a", res.Header.Get("X-1"))
assert.Equal(t, "b", res.Header.Get("X-2"))
assert.False(t, fail)
}
func TestRedirects(t *testing.T) {
var statusStack []int
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// always consume the body
b, err := io.ReadAll(r.Body)
require.NoError(t, err)
if len(statusStack) > 0 {
status := statusStack[len(statusStack)-1]
statusStack = statusStack[:len(statusStack)-1]
if status/100 == 3 {
http.Redirect(w, r, "/"+fmt.Sprint(len(statusStack)), status)
return
}
w.WriteHeader(status)
return
}
// on success, return the received body
_, err = w.Write(b)
require.NoError(t, err)
}))
defer srv.Close()
t.Run("without body, without redirect and retry", func(t *testing.T) {
tr := NewTransport(nil, func(attempt Attempt) bool { return false }, ConstDelay(0))
c := &http.Client{Transport: tr}
res, err := c.Post(srv.URL+"/test", "", nil)
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, "", string(got))
})
t.Run("without body, with redirects, no retry", func(t *testing.T) {
statusStack = []int{http.StatusTemporaryRedirect, http.StatusTemporaryRedirect}
tr := NewTransport(nil, func(attempt Attempt) bool { return false }, ConstDelay(0))
c := &http.Client{Transport: tr}
res, err := c.Post(srv.URL+"/test", "", nil)
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, "", string(got))
})
t.Run("without body, with redirects and retries", func(t *testing.T) {
statusStack = []int{http.StatusTemporaryRedirect, http.StatusInternalServerError, http.StatusTemporaryRedirect, http.StatusInternalServerError}
tr := NewTransport(nil, RetryStatuses(http.StatusInternalServerError), ConstDelay(0))
c := &http.Client{Transport: tr}
res, err := c.Post(srv.URL+"/test", "", nil)
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, "", string(got))
})
t.Run("with body, without redirect and retry", func(t *testing.T) {
tr := NewTransport(nil, func(attempt Attempt) bool { return false }, ConstDelay(0))
c := &http.Client{Transport: tr}
body := "ok"
res, err := c.Post(srv.URL+"/test", "", strings.NewReader(body))
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, body, string(got))
})
t.Run("with body, with redirects, no retry", func(t *testing.T) {
statusStack = []int{http.StatusTemporaryRedirect, http.StatusTemporaryRedirect}
tr := NewTransport(nil, func(attempt Attempt) bool { return false }, ConstDelay(0))
c := &http.Client{Transport: tr}
body := "ok"
res, err := c.Post(srv.URL+"/test", "", strings.NewReader(body))
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, body, string(got))
})
t.Run("with body, with redirects and retries", func(t *testing.T) {
statusStack = []int{http.StatusTemporaryRedirect, http.StatusInternalServerError, http.StatusTemporaryRedirect, http.StatusInternalServerError}
tr := NewTransport(nil, RetryStatuses(http.StatusInternalServerError), ConstDelay(0))
c := &http.Client{Transport: tr}
body := "ok"
res, err := c.Post(srv.URL+"/test", "", strings.NewReader(body))
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, 200, res.StatusCode)
assert.Equal(t, body, string(got))
})
t.Run("with body, with redirects, no automatic GetBody, no retry", func(t *testing.T) {
statusStack = []int{http.StatusTemporaryRedirect, http.StatusTemporaryRedirect}
tr := NewTransport(nil, func(attempt Attempt) bool { return false }, ConstDelay(0))
c := &http.Client{Transport: tr}
body := "ok"
// LimitReader disables the automatic setting of GetBody by Go's stdlib (it
// only supports known readers that can be safely reconstructed, such as
// bytes and strings readers)
res, err := c.Post(srv.URL+"/test", "", io.LimitReader(strings.NewReader(body), 100))
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, http.StatusTemporaryRedirect, res.StatusCode)
assert.Empty(t, string(got))
})
t.Run("with body, with redirects, explicit GetBody, no retry", func(t *testing.T) {
statusStack = []int{http.StatusTemporaryRedirect, http.StatusTemporaryRedirect}
tr := NewTransport(nil, func(attempt Attempt) bool { return false }, ConstDelay(0))
c := &http.Client{Transport: tr}
body := "ok"
req, err := http.NewRequest("POST", srv.URL+"/test", io.LimitReader(strings.NewReader(body), 100))
require.NoError(t, err)
req.GetBody = func() (io.ReadCloser, error) {
return io.NopCloser(io.LimitReader(strings.NewReader(body), 100)), nil
}
res, err := c.Do(req)
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, http.StatusOK, res.StatusCode)
assert.Equal(t, body, string(got))
})
t.Run("with body, with redirects and retries, explicit GetBody", func(t *testing.T) {
statusStack = []int{http.StatusInternalServerError, http.StatusTemporaryRedirect, http.StatusInternalServerError, http.StatusTemporaryRedirect}
tr := NewTransport(nil, RetryStatuses(http.StatusInternalServerError), ConstDelay(0))
c := &http.Client{Transport: tr}
body := "ok"
req, err := http.NewRequest("POST", srv.URL+"/test", io.LimitReader(strings.NewReader(body), 100))
require.NoError(t, err)
req.GetBody = func() (io.ReadCloser, error) {
return io.NopCloser(io.LimitReader(strings.NewReader(body), 100)), nil
}
res, err := c.Do(req)
require.NoError(t, err)
defer res.Body.Close()
got, err := io.ReadAll(res.Body)
require.NoError(t, err)
assert.Equal(t, http.StatusOK, res.StatusCode)
assert.Equal(t, body, string(got))
})
}