k8s.io/client-go@v0.31.1/util/testing/fake_handler.go (about)

     1  /*
     2  Copyright 2014 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package testing
    18  
    19  import (
    20  	"io"
    21  	"net/http"
    22  	"net/url"
    23  	"reflect"
    24  	"sync"
    25  )
    26  
    27  // TestInterface is a simple interface providing Errorf, to make injection for
    28  // testing easier (insert 'yo dawg' meme here).
    29  type TestInterface interface {
    30  	Errorf(format string, args ...interface{})
    31  	Logf(format string, args ...interface{})
    32  }
    33  
    34  // LogInterface is a simple interface to allow injection of Logf to report serving errors.
    35  type LogInterface interface {
    36  	Logf(format string, args ...interface{})
    37  }
    38  
    39  // FakeHandler is to assist in testing HTTP requests. Notice that FakeHandler is
    40  // not thread safe and you must not direct traffic to except for the request
    41  // you want to test. You can do this by hiding it in an http.ServeMux.
    42  type FakeHandler struct {
    43  	RequestReceived *http.Request
    44  	RequestBody     string
    45  	StatusCode      int
    46  	ResponseBody    string
    47  	// For logging - you can use a *testing.T
    48  	// This will keep log messages associated with the test.
    49  	T LogInterface
    50  
    51  	// Enforce "only one use" constraint.
    52  	lock           sync.Mutex
    53  	requestCount   int
    54  	hasBeenChecked bool
    55  
    56  	SkipRequestFn func(verb string, url url.URL) bool
    57  }
    58  
    59  func (f *FakeHandler) SetResponseBody(responseBody string) {
    60  	f.lock.Lock()
    61  	defer f.lock.Unlock()
    62  	f.ResponseBody = responseBody
    63  }
    64  
    65  func (f *FakeHandler) ServeHTTP(response http.ResponseWriter, request *http.Request) {
    66  	f.lock.Lock()
    67  	defer f.lock.Unlock()
    68  
    69  	if f.SkipRequestFn != nil && f.SkipRequestFn(request.Method, *request.URL) {
    70  		response.Header().Set("Content-Type", "application/json")
    71  		response.WriteHeader(f.StatusCode)
    72  		response.Write([]byte(f.ResponseBody))
    73  		return
    74  	}
    75  
    76  	f.requestCount++
    77  	if f.hasBeenChecked {
    78  		panic("got request after having been validated")
    79  	}
    80  
    81  	f.RequestReceived = request
    82  	response.Header().Set("Content-Type", "application/json")
    83  	response.WriteHeader(f.StatusCode)
    84  	response.Write([]byte(f.ResponseBody))
    85  
    86  	bodyReceived, err := io.ReadAll(request.Body)
    87  	if err != nil && f.T != nil {
    88  		f.T.Logf("Received read error: %v", err)
    89  	}
    90  	f.RequestBody = string(bodyReceived)
    91  	if f.T != nil {
    92  		f.T.Logf("request body: %s", f.RequestBody)
    93  	}
    94  }
    95  
    96  func (f *FakeHandler) ValidateRequestCount(t TestInterface, count int) bool {
    97  	ok := true
    98  	f.lock.Lock()
    99  	defer f.lock.Unlock()
   100  	if f.requestCount != count {
   101  		ok = false
   102  		t.Errorf("Expected %d call, but got %d. Only the last call is recorded and checked.", count, f.requestCount)
   103  	}
   104  	f.hasBeenChecked = true
   105  	return ok
   106  }
   107  
   108  // ValidateRequest verifies that FakeHandler received a request with expected path, method, and body.
   109  func (f *FakeHandler) ValidateRequest(t TestInterface, expectedPath, expectedMethod string, body *string) {
   110  	f.lock.Lock()
   111  	defer f.lock.Unlock()
   112  	if f.requestCount != 1 {
   113  		t.Logf("Expected 1 call, but got %v. Only the last call is recorded and checked.", f.requestCount)
   114  	}
   115  	f.hasBeenChecked = true
   116  
   117  	expectURL, err := url.Parse(expectedPath)
   118  	if err != nil {
   119  		t.Errorf("Couldn't parse %v as a URL.", expectedPath)
   120  	}
   121  	if f.RequestReceived == nil {
   122  		t.Errorf("Unexpected nil request received for %s", expectedPath)
   123  		return
   124  	}
   125  	if f.RequestReceived.URL.Path != expectURL.Path {
   126  		t.Errorf("Unexpected request path for request %#v, received: %q, expected: %q", f.RequestReceived, f.RequestReceived.URL.Path, expectURL.Path)
   127  	}
   128  	if e, a := expectURL.Query(), f.RequestReceived.URL.Query(); !reflect.DeepEqual(e, a) {
   129  		t.Errorf("Unexpected query for request %#v, received: %q, expected: %q", f.RequestReceived, a, e)
   130  	}
   131  	if f.RequestReceived.Method != expectedMethod {
   132  		t.Errorf("Unexpected method: %q, expected: %q", f.RequestReceived.Method, expectedMethod)
   133  	}
   134  	if body != nil {
   135  		if *body != f.RequestBody {
   136  			t.Errorf("Received body:\n%s\n Doesn't match expected body:\n%s", f.RequestBody, *body)
   137  		}
   138  	}
   139  }