[#178] wrapReader: Fix goroutine leak

In case of error in FrostFS.CreateObject wrapped reader
can be blocked because of synchronous pipe. We have to read out all payload in such case.

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/handler/put_test.go

@@ -3,11 +3,14 @@ package handler
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"encoding/json"
+	"errors"
 	"io"
 	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -172,6 +175,24 @@ func TestPutObjectWithStreamBodyError(t *testing.T) {
 	checkNotFound(t, tc, bktName, objName, emptyVersion)
 }
 
+func TestPutObjectWithWrapReaderDiscardOnError(t *testing.T) {
+	tc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-for-put", "object-for-put"
+	createTestBucket(tc, bktName)
+
+	content := make([]byte, 128*1024)
+	_, err := rand.Read(content)
+	require.NoError(t, err)
+
+	w, r := prepareTestPayloadRequest(tc, bktName, objName, bytes.NewReader(content))
+	tc.tp.SetObjectPutError(objName, errors.New("some error"))
+	numGoroutineBefore := runtime.NumGoroutine()
+	tc.Handler().PutObjectHandler(w, r)
+	numGoroutineAfter := runtime.NumGoroutine()
+	require.Equal(t, numGoroutineBefore, numGoroutineAfter, "goroutines shouldn't leak during put object")
+}
+
 func TestPutObjectWithStreamBodyAWSExample(t *testing.T) {
 	hc := prepareHandlerContext(t)