knative.dev/pkg@v0.0.0-20260602142205-ac97e43f6622/apis/testing/fuzzer/fuzzer.go (about)

     1  /*
     2  Copyright 2020 The Knative 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 fuzzer
    18  
    19  import (
    20  	"math/rand"
    21  	"net/url"
    22  
    23  	corev1 "k8s.io/api/core/v1"
    24  	"k8s.io/apimachinery/pkg/api/apitesting/fuzzer"
    25  	"k8s.io/apimachinery/pkg/runtime/serializer"
    26  	"knative.dev/pkg/apis"
    27  	"sigs.k8s.io/randfill"
    28  )
    29  
    30  // Funcs includes fuzzing funcs for knative.dev/serving types
    31  //
    32  // For other examples see
    33  // https://github.com/kubernetes/apimachinery/blob/master/pkg/apis/meta/fuzzer/fuzzer.go
    34  var Funcs = fuzzer.MergeFuzzerFuncs(
    35  	func(codecs serializer.CodecFactory) []any {
    36  		return []any{
    37  			func(u *apis.URL, c randfill.Continue) {
    38  				u.Scheme = randStringAtoZ(c.Rand)
    39  				u.Host = randStringAtoZ(c.Rand)
    40  				u.User = url.UserPassword(
    41  					randStringAtoZ(c.Rand), // username
    42  					randStringAtoZ(c.Rand), // password
    43  				)
    44  				u.RawPath = url.PathEscape(c.String(0))
    45  				u.RawQuery = url.QueryEscape(c.String(0))
    46  			},
    47  		}
    48  	},
    49  )
    50  
    51  // FuzzConditions fuzzes the values for the conditions. It doesn't add
    52  // any new condition types
    53  //
    54  // Consumers should initialize their conditions prior to fuzzing them.
    55  // For example:
    56  //
    57  //	func(s *SomeStatus, c fuzz.Continue) {
    58  //	  c.FuzzNoCustom(s) // fuzz the status object
    59  //
    60  //	  // Clear the random fuzzed condition
    61  //	  s.Status.SetConditions(nil)
    62  //
    63  //	  // Fuzz the known conditions except their type value
    64  //	  s.InitializeConditions()
    65  //	  fuzz.Conditions(&s.Status, c)
    66  //	}
    67  func FuzzConditions(accessor apis.ConditionsAccessor, c randfill.Continue) {
    68  	conds := accessor.GetConditions()
    69  	for i, cond := range conds {
    70  		// Leave condition.Type untouched
    71  		cond.Status = corev1.ConditionStatus(c.String(0))
    72  		cond.Severity = apis.ConditionSeverity(c.String(0))
    73  		cond.Message = c.String(0)
    74  		cond.Reason = c.String(0)
    75  		c.FillNoCustom(&cond.LastTransitionTime)
    76  		conds[i] = cond
    77  	}
    78  	accessor.SetConditions(conds)
    79  }
    80  
    81  // taken from gofuzz internals for RandString
    82  type charRange struct {
    83  	first, last rune
    84  }
    85  
    86  func (c *charRange) choose(r *rand.Rand) rune {
    87  	count := int64(c.last - c.first + 1)
    88  	ch := c.first + rune(r.Int63n(count))
    89  
    90  	return ch
    91  }
    92  
    93  // not fully exhaustive
    94  func randStringAtoZ(r *rand.Rand) string {
    95  	hostCharRange := charRange{'a', 'z'}
    96  
    97  	n := r.Intn(20)
    98  	runes := make([]rune, n)
    99  	for i := range runes {
   100  		runes[i] = hostCharRange.choose(r)
   101  	}
   102  	return string(runes)
   103  }