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/*
Copyright 2014 Google Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package fuzz is a library for populating go objects with random values.
package fuzz

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/*
Copyright 2014 Google Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fuzz
import (
"fmt"
"math/rand"
"reflect"
"time"
)
// fuzzFuncMap is a map from a type to a fuzzFunc that handles that type.
type fuzzFuncMap map[reflect.Type]reflect.Value
// Fuzzer knows how to fill any object with random fields.
type Fuzzer struct {
fuzzFuncs fuzzFuncMap
defaultFuzzFuncs fuzzFuncMap
r *rand.Rand
nilChance float64
minElements int
maxElements int
}
// New returns a new Fuzzer. Customize your Fuzzer further by calling Funcs,
// RandSource, NilChance, or NumElements in any order.
func New() *Fuzzer {
f := &Fuzzer{
defaultFuzzFuncs: fuzzFuncMap{
reflect.TypeOf(&time.Time{}): reflect.ValueOf(fuzzTime),
},
fuzzFuncs: fuzzFuncMap{},
r: rand.New(rand.NewSource(time.Now().UnixNano())),
nilChance: .2,
minElements: 1,
maxElements: 10,
}
return f
}
// Funcs adds each entry in fuzzFuncs as a custom fuzzing function.
//
// Each entry in fuzzFuncs must be a function taking two parameters.
// The first parameter must be a pointer or map. It is the variable that
// function will fill with random data. The second parameter must be a
// fuzz.Continue, which will provide a source of randomness and a way
// to automatically continue fuzzing smaller pieces of the first parameter.
//
// These functions are called sensibly, e.g., if you wanted custom string
// fuzzing, the function `func(s *string, c fuzz.Continue)` would get
// called and passed the address of strings. Maps and pointers will always
// be made/new'd for you, ignoring the NilChange option. For slices, it
// doesn't make much sense to pre-create them--Fuzzer doesn't know how
// long you want your slice--so take a pointer to a slice, and make it
// yourself. (If you don't want your map/pointer type pre-made, take a
// pointer to it, and make it yourself.) See the examples for a range of
// custom functions.
func (f *Fuzzer) Funcs(fuzzFuncs ...interface{}) *Fuzzer {
for i := range fuzzFuncs {
v := reflect.ValueOf(fuzzFuncs[i])
if v.Kind() != reflect.Func {
panic("Need only funcs!")
}
t := v.Type()
if t.NumIn() != 2 || t.NumOut() != 0 {
panic("Need 2 in and 0 out params!")
}
argT := t.In(0)
switch argT.Kind() {
case reflect.Ptr, reflect.Map:
default:
panic("fuzzFunc must take pointer or map type")
}
if t.In(1) != reflect.TypeOf(Continue{}) {
panic("fuzzFunc's second parameter must be type fuzz.Continue")
}
f.fuzzFuncs[argT] = v
}
return f
}
// RandSource causes f to get values from the given source of randomness.
// Use if you want deterministic fuzzing.
func (f *Fuzzer) RandSource(s rand.Source) *Fuzzer {
f.r = rand.New(s)
return f
}
// NilChance sets the probability of creating a nil pointer, map, or slice to
// 'p'. 'p' should be between 0 (no nils) and 1 (all nils), inclusive.
func (f *Fuzzer) NilChance(p float64) *Fuzzer {
if p < 0 || p > 1 {
panic("p should be between 0 and 1, inclusive.")
}
f.nilChance = p
return f
}
// NumElements sets the minimum and maximum number of elements that will be
// added to a non-nil map or slice.
func (f *Fuzzer) NumElements(atLeast, atMost int) *Fuzzer {
if atLeast > atMost {
panic("atLeast must be <= atMost")
}
if atLeast < 0 {
panic("atLeast must be >= 0")
}
f.minElements = atLeast
f.maxElements = atMost
return f
}
func (f *Fuzzer) genElementCount() int {
if f.minElements == f.maxElements {
return f.minElements
}
return f.minElements + f.r.Intn(f.maxElements-f.minElements+1)
}
func (f *Fuzzer) genShouldFill() bool {
return f.r.Float64() > f.nilChance
}
// Fuzz recursively fills all of obj's fields with something random. First
// this tries to find a custom fuzz function (see Funcs). If there is no
// custom function this tests whether the object implements fuzz.Interface and,
// if so, calls Fuzz on it to fuzz itself. If that fails, this will see if
// there is a default fuzz function provided by this package. If all of that
// fails, this will generate random values for all primitive fields and then
// recurse for all non-primitives.
//
// Not safe for cyclic or tree-like structs!
//
// obj must be a pointer. Only exported (public) fields can be set (thanks, golang :/ )
// Intended for tests, so will panic on bad input or unimplemented fields.
func (f *Fuzzer) Fuzz(obj interface{}) {
v := reflect.ValueOf(obj)
if v.Kind() != reflect.Ptr {
panic("needed ptr!")
}
v = v.Elem()
f.doFuzz(v, 0)
}
// FuzzNoCustom is just like Fuzz, except that any custom fuzz function for
// obj's type will not be called and obj will not be tested for fuzz.Interface
// conformance. This applies only to obj and not other instances of obj's
// type.
// Not safe for cyclic or tree-like structs!
// obj must be a pointer. Only exported (public) fields can be set (thanks, golang :/ )
// Intended for tests, so will panic on bad input or unimplemented fields.
func (f *Fuzzer) FuzzNoCustom(obj interface{}) {
v := reflect.ValueOf(obj)
if v.Kind() != reflect.Ptr {
panic("needed ptr!")
}
v = v.Elem()
f.doFuzz(v, flagNoCustomFuzz)
}
const (
// Do not try to find a custom fuzz function. Does not apply recursively.
flagNoCustomFuzz uint64 = 1 << iota
)
func (f *Fuzzer) doFuzz(v reflect.Value, flags uint64) {
if !v.CanSet() {
return
}
if flags&flagNoCustomFuzz == 0 {
// Check for both pointer and non-pointer custom functions.
if v.CanAddr() && f.tryCustom(v.Addr()) {
return
}
if f.tryCustom(v) {
return
}
}
if fn, ok := fillFuncMap[v.Kind()]; ok {
fn(v, f.r)
return
}
switch v.Kind() {
case reflect.Map:
if f.genShouldFill() {
v.Set(reflect.MakeMap(v.Type()))
n := f.genElementCount()
for i := 0; i < n; i++ {
key := reflect.New(v.Type().Key()).Elem()
f.doFuzz(key, 0)
val := reflect.New(v.Type().Elem()).Elem()
f.doFuzz(val, 0)
v.SetMapIndex(key, val)
}
return
}
v.Set(reflect.Zero(v.Type()))
case reflect.Ptr:
if f.genShouldFill() {
v.Set(reflect.New(v.Type().Elem()))
f.doFuzz(v.Elem(), 0)
return
}
v.Set(reflect.Zero(v.Type()))
case reflect.Slice:
if f.genShouldFill() {
n := f.genElementCount()
v.Set(reflect.MakeSlice(v.Type(), n, n))
for i := 0; i < n; i++ {
f.doFuzz(v.Index(i), 0)
}
return
}
v.Set(reflect.Zero(v.Type()))
case reflect.Array:
if f.genShouldFill() {
n := v.Len()
for i := 0; i < n; i++ {
f.doFuzz(v.Index(i), 0)
}
return
}
v.Set(reflect.Zero(v.Type()))
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
f.doFuzz(v.Field(i), 0)
}
case reflect.Chan:
fallthrough
case reflect.Func:
fallthrough
case reflect.Interface:
fallthrough
default:
panic(fmt.Sprintf("Can't handle %#v", v.Interface()))
}
}
// tryCustom searches for custom handlers, and returns true iff it finds a match
// and successfully randomizes v.
func (f *Fuzzer) tryCustom(v reflect.Value) bool {
// First: see if we have a fuzz function for it.
doCustom, ok := f.fuzzFuncs[v.Type()]
if !ok {
// Second: see if it can fuzz itself.
if v.CanInterface() {
intf := v.Interface()
if fuzzable, ok := intf.(Interface); ok {
fuzzable.Fuzz(Continue{f: f, Rand: f.r})
return true
}
}
// Finally: see if there is a default fuzz function.
doCustom, ok = f.defaultFuzzFuncs[v.Type()]
if !ok {
return false
}
}
switch v.Kind() {
case reflect.Ptr:
if v.IsNil() {
if !v.CanSet() {
return false
}
v.Set(reflect.New(v.Type().Elem()))
}
case reflect.Map:
if v.IsNil() {
if !v.CanSet() {
return false
}
v.Set(reflect.MakeMap(v.Type()))
}
default:
return false
}
doCustom.Call([]reflect.Value{v, reflect.ValueOf(Continue{
f: f,
Rand: f.r,
})})
return true
}
// Interface represents an object that knows how to fuzz itself. Any time we
// find a type that implements this interface we will delegate the act of
// fuzzing itself.
type Interface interface {
Fuzz(c Continue)
}
// Continue can be passed to custom fuzzing functions to allow them to use
// the correct source of randomness and to continue fuzzing their members.
type Continue struct {
f *Fuzzer
// For convenience, Continue implements rand.Rand via embedding.
// Use this for generating any randomness if you want your fuzzing
// to be repeatable for a given seed.
*rand.Rand
}
// Fuzz continues fuzzing obj. obj must be a pointer.
func (c Continue) Fuzz(obj interface{}) {
v := reflect.ValueOf(obj)
if v.Kind() != reflect.Ptr {
panic("needed ptr!")
}
v = v.Elem()
c.f.doFuzz(v, 0)
}
// FuzzNoCustom continues fuzzing obj, except that any custom fuzz function for
// obj's type will not be called and obj will not be tested for fuzz.Interface
// conformance. This applies only to obj and not other instances of obj's
// type.
func (c Continue) FuzzNoCustom(obj interface{}) {
v := reflect.ValueOf(obj)
if v.Kind() != reflect.Ptr {
panic("needed ptr!")
}
v = v.Elem()
c.f.doFuzz(v, flagNoCustomFuzz)
}
// RandString makes a random string up to 20 characters long. The returned string
// may include a variety of (valid) UTF-8 encodings.
func (c Continue) RandString() string {
return randString(c.Rand)
}
// RandUint64 makes random 64 bit numbers.
// Weirdly, rand doesn't have a function that gives you 64 random bits.
func (c Continue) RandUint64() uint64 {
return randUint64(c.Rand)
}
// RandBool returns true or false randomly.
func (c Continue) RandBool() bool {
return randBool(c.Rand)
}
func fuzzInt(v reflect.Value, r *rand.Rand) {
v.SetInt(int64(randUint64(r)))
}
func fuzzUint(v reflect.Value, r *rand.Rand) {
v.SetUint(randUint64(r))
}
func fuzzTime(t *time.Time, c Continue) {
var sec, nsec int64
// Allow for about 1000 years of random time values, which keeps things
// like JSON parsing reasonably happy.
sec = c.Rand.Int63n(1000 * 365 * 24 * 60 * 60)
c.Fuzz(&nsec)
*t = time.Unix(sec, nsec)
}
var fillFuncMap = map[reflect.Kind]func(reflect.Value, *rand.Rand){
reflect.Bool: func(v reflect.Value, r *rand.Rand) {
v.SetBool(randBool(r))
},
reflect.Int: fuzzInt,
reflect.Int8: fuzzInt,
reflect.Int16: fuzzInt,
reflect.Int32: fuzzInt,
reflect.Int64: fuzzInt,
reflect.Uint: fuzzUint,
reflect.Uint8: fuzzUint,
reflect.Uint16: fuzzUint,
reflect.Uint32: fuzzUint,
reflect.Uint64: fuzzUint,
reflect.Uintptr: fuzzUint,
reflect.Float32: func(v reflect.Value, r *rand.Rand) {
v.SetFloat(float64(r.Float32()))
},
reflect.Float64: func(v reflect.Value, r *rand.Rand) {
v.SetFloat(r.Float64())
},
reflect.Complex64: func(v reflect.Value, r *rand.Rand) {
panic("unimplemented")
},
reflect.Complex128: func(v reflect.Value, r *rand.Rand) {
panic("unimplemented")
},
reflect.String: func(v reflect.Value, r *rand.Rand) {
v.SetString(randString(r))
},
reflect.UnsafePointer: func(v reflect.Value, r *rand.Rand) {
panic("unimplemented")
},
}
// randBool returns true or false randomly.
func randBool(r *rand.Rand) bool {
if r.Int()&1 == 1 {
return true
}
return false
}
type charRange struct {
first, last rune
}
// choose returns a random unicode character from the given range, using the
// given randomness source.
func (r *charRange) choose(rand *rand.Rand) rune {
count := int64(r.last - r.first)
return r.first + rune(rand.Int63n(count))
}
var unicodeRanges = []charRange{
{' ', '~'}, // ASCII characters
{'\u00a0', '\u02af'}, // Multi-byte encoded characters
{'\u4e00', '\u9fff'}, // Common CJK (even longer encodings)
}
// randString makes a random string up to 20 characters long. The returned string
// may include a variety of (valid) UTF-8 encodings.
func randString(r *rand.Rand) string {
n := r.Intn(20)
runes := make([]rune, n)
for i := range runes {
runes[i] = unicodeRanges[r.Intn(len(unicodeRanges))].choose(r)
}
return string(runes)
}
// randUint64 makes random 64 bit numbers.
// Weirdly, rand doesn't have a function that gives you 64 random bits.
func randUint64(r *rand.Rand) uint64 {
return uint64(r.Uint32())<<32 | uint64(r.Uint32())
}